[Update] libpng version 1.6.37
* Merge libpng version 1.6.37: commit 'a40189cf881e9f0db80511c382292a5604c3c3d1'
* Suppress warning when comparing between signed and unsigned values
* Remove unneeded files
* Add arm source file in BUILD.gn
* Tested png, user report 89106481223
Fixed: 87754
Change-Id: Icc5d5754388356c6244770178facd03a36bfb1b4
diff --git a/AUTHORS b/AUTHORS
new file mode 100644
index 0000000..79a3d10
--- /dev/null
+++ b/AUTHORS
@@ -0,0 +1,45 @@
+PNG REFERENCE LIBRARY AUTHORS
+=============================
+
+This is the list of PNG Reference Library ("libpng") Contributing
+Authors, for copyright and licensing purposes.
+
+ * Andreas Dilger
+ * Cosmin Truta
+ * Dave Martindale
+ * Eric S. Raymond
+ * Gilles Vollant
+ * Glenn Randers-Pehrson
+ * Greg Roelofs
+ * Guy Eric Schalnat
+ * James Yu
+ * John Bowler
+ * Kevin Bracey
+ * Magnus Holmgren
+ * Mandar Sahastrabuddhe
+ * Mans Rullgard
+ * Matt Sarett
+ * Mike Klein
+ * Paul Schmidt
+ * Sam Bushell
+ * Samuel Williams
+ * Simon-Pierre Cadieux
+ * Tim Wegner
+ * Tom Lane
+ * Tom Tanner
+ * Vadim Barkov
+ * Willem van Schaik
+ * Zhijie Liang
+ * Arm Holdings
+ - Richard Townsend
+ * Google Inc.
+ - Matt Sarett
+ - Mike Klein
+
+The build projects, the build scripts, the test scripts, and other
+files in the "projects", "scripts" and "tests" directories, have other
+copyright owners, but are released under the libpng license.
+
+Some files in the "contrib" directory, and some tools-generated files
+that are distributed with libpng, have other copyright owners, and are
+released under other open source licenses.
diff --git a/BUILD.gn b/BUILD.gn
index 274c4aa..ea5683a 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -16,6 +16,7 @@
cflags = [
"-Wno-conversion",
"-Wno-implicit-fallthrough",
+ "-Wno-sign-compare",
# libpng checks that the width is not greater than PNG_SIZE_MAX.
# On platforms where size_t is 64-bits, this comparison will always
@@ -65,6 +66,7 @@
sources += [
"arm/arm_init.c",
"arm/filter_neon_intrinsics.c",
+ "arm/palette_neon_intrinsics.c",
]
defines += [
"PNG_ARM_NEON_OPT=2",
diff --git a/LICENSE b/LICENSE
index d20f39e..e0c5b53 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,50 +1,82 @@
+COPYRIGHT NOTICE, DISCLAIMER, and LICENSE
+=========================================
-This copy of the libpng notices is provided for your convenience. In case of
-any discrepancy between this copy and the notices in the file png.h that is
-included in the libpng distribution, the latter shall prevail.
+PNG Reference Library License version 2
+---------------------------------------
-COPYRIGHT NOTICE, DISCLAIMER, and LICENSE:
+ * Copyright (c) 1995-2019 The PNG Reference Library Authors.
+ * Copyright (c) 2018-2019 Cosmin Truta.
+ * Copyright (c) 2000-2002, 2004, 2006-2018 Glenn Randers-Pehrson.
+ * Copyright (c) 1996-1997 Andreas Dilger.
+ * Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
-If you modify libpng you may insert additional notices immediately following
-this sentence.
+The software is supplied "as is", without warranty of any kind,
+express or implied, including, without limitation, the warranties
+of merchantability, fitness for a particular purpose, title, and
+non-infringement. In no event shall the Copyright owners, or
+anyone distributing the software, be liable for any damages or
+other liability, whether in contract, tort or otherwise, arising
+from, out of, or in connection with the software, or the use or
+other dealings in the software, even if advised of the possibility
+of such damage.
-This code is released under the libpng license.
+Permission is hereby granted to use, copy, modify, and distribute
+this software, or portions hereof, for any purpose, without fee,
+subject to the following restrictions:
-libpng versions 1.0.7, July 1, 2000 through 1.6.24, August 4, 2016 are
-Copyright (c) 2000-2002, 2004, 2006-2016 Glenn Randers-Pehrson, are
+ 1. The origin of this software must not be misrepresented; you
+ must not claim that you wrote the original software. If you
+ use this software in a product, an acknowledgment in the product
+ documentation would be appreciated, but is not required.
+
+ 2. Altered source versions must be plainly marked as such, and must
+ not be misrepresented as being the original software.
+
+ 3. This Copyright notice may not be removed or altered from any
+ source or altered source distribution.
+
+
+PNG Reference Library License version 1 (for libpng 0.5 through 1.6.35)
+-----------------------------------------------------------------------
+
+libpng versions 1.0.7, July 1, 2000, through 1.6.35, July 15, 2018 are
+Copyright (c) 2000-2002, 2004, 2006-2018 Glenn Randers-Pehrson, are
derived from libpng-1.0.6, and are distributed according to the same
disclaimer and license as libpng-1.0.6 with the following individuals
added to the list of Contributing Authors:
- Simon-Pierre Cadieux
- Eric S. Raymond
- Mans Rullgard
- Cosmin Truta
- Gilles Vollant
- James Yu
+ Simon-Pierre Cadieux
+ Eric S. Raymond
+ Mans Rullgard
+ Cosmin Truta
+ Gilles Vollant
+ James Yu
+ Mandar Sahastrabuddhe
+ Google Inc.
+ Vadim Barkov
and with the following additions to the disclaimer:
- There is no warranty against interference with your enjoyment of the
- library or against infringement. There is no warranty that our
- efforts or the library will fulfill any of your particular purposes
- or needs. This library is provided with all faults, and the entire
- risk of satisfactory quality, performance, accuracy, and effort is with
- the user.
+ There is no warranty against interference with your enjoyment of
+ the library or against infringement. There is no warranty that our
+ efforts or the library will fulfill any of your particular purposes
+ or needs. This library is provided with all faults, and the entire
+ risk of satisfactory quality, performance, accuracy, and effort is
+ with the user.
Some files in the "contrib" directory and some configure-generated
-files that are distributed with libpng have other copyright owners and
+files that are distributed with libpng have other copyright owners, and
are released under other open source licenses.
libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are
Copyright (c) 1998-2000 Glenn Randers-Pehrson, are derived from
libpng-0.96, and are distributed according to the same disclaimer and
-license as libpng-0.96, with the following individuals added to the list
-of Contributing Authors:
+license as libpng-0.96, with the following individuals added to the
+list of Contributing Authors:
- Tom Lane
- Glenn Randers-Pehrson
- Willem van Schaik
+ Tom Lane
+ Glenn Randers-Pehrson
+ Willem van Schaik
libpng versions 0.89, June 1996, through 0.96, May 1997, are
Copyright (c) 1996-1997 Andreas Dilger, are derived from libpng-0.88,
@@ -52,14 +84,14 @@
libpng-0.88, with the following individuals added to the list of
Contributing Authors:
- John Bowler
- Kevin Bracey
- Sam Bushell
- Magnus Holmgren
- Greg Roelofs
- Tom Tanner
+ John Bowler
+ Kevin Bracey
+ Sam Bushell
+ Magnus Holmgren
+ Greg Roelofs
+ Tom Tanner
-Some files in the "scripts" directory have other copyright owners
+Some files in the "scripts" directory have other copyright owners,
but are released under this license.
libpng versions 0.5, May 1995, through 0.88, January 1996, are
@@ -68,63 +100,35 @@
For the purposes of this copyright and license, "Contributing Authors"
is defined as the following set of individuals:
- Andreas Dilger
- Dave Martindale
- Guy Eric Schalnat
- Paul Schmidt
- Tim Wegner
+ Andreas Dilger
+ Dave Martindale
+ Guy Eric Schalnat
+ Paul Schmidt
+ Tim Wegner
-The PNG Reference Library is supplied "AS IS". The Contributing Authors
-and Group 42, Inc. disclaim all warranties, expressed or implied,
-including, without limitation, the warranties of merchantability and of
-fitness for any purpose. The Contributing Authors and Group 42, Inc.
-assume no liability for direct, indirect, incidental, special, exemplary,
-or consequential damages, which may result from the use of the PNG
-Reference Library, even if advised of the possibility of such damage.
+The PNG Reference Library is supplied "AS IS". The Contributing
+Authors and Group 42, Inc. disclaim all warranties, expressed or
+implied, including, without limitation, the warranties of
+merchantability and of fitness for any purpose. The Contributing
+Authors and Group 42, Inc. assume no liability for direct, indirect,
+incidental, special, exemplary, or consequential damages, which may
+result from the use of the PNG Reference Library, even if advised of
+the possibility of such damage.
Permission is hereby granted to use, copy, modify, and distribute this
source code, or portions hereof, for any purpose, without fee, subject
to the following restrictions:
- 1. The origin of this source code must not be misrepresented.
+ 1. The origin of this source code must not be misrepresented.
- 2. Altered versions must be plainly marked as such and must not
- be misrepresented as being the original source.
+ 2. Altered versions must be plainly marked as such and must not
+ be misrepresented as being the original source.
- 3. This Copyright notice may not be removed or altered from any
- source or altered source distribution.
+ 3. This Copyright notice may not be removed or altered from any
+ source or altered source distribution.
-The Contributing Authors and Group 42, Inc. specifically permit, without
-fee, and encourage the use of this source code as a component to
-supporting the PNG file format in commercial products. If you use this
-source code in a product, acknowledgment is not required but would be
-appreciated.
-
-END OF COPYRIGHT NOTICE, DISCLAIMER, and LICENSE.
-
-TRADEMARK:
-
-The name "libpng" has not been registered by the Copyright owner
-as a trademark in any jurisdiction. However, because libpng has
-been distributed and maintained world-wide, continually since 1995,
-the Copyright owner claims "common-law trademark protection" in any
-jurisdiction where common-law trademark is recognized.
-
-OSI CERTIFICATION:
-
-Libpng is OSI Certified Open Source Software. OSI Certified Open Source is
-a certification mark of the Open Source Initiative. OSI has not addressed
-the additional disclaimers inserted at version 1.0.7.
-
-EXPORT CONTROL:
-
-The Copyright owner believes that the Export Control Classification
-Number (ECCN) for libpng is EAR99, which means not subject to export
-controls or International Traffic in Arms Regulations (ITAR) because
-it is open source, publicly available software, that does not contain
-any encryption software. See the EAR, paragraphs 734.3(b)(3) and
-734.7(b).
-
-Glenn Randers-Pehrson
-glennrp at users.sourceforge.net
-August 4, 2016
+The Contributing Authors and Group 42, Inc. specifically permit,
+without fee, and encourage the use of this source code as a component
+to supporting the PNG file format in commercial products. If you use
+this source code in a product, acknowledgment is not required but would
+be appreciated.
diff --git a/README b/README
index a8fba91..cfc1f0e 100644
--- a/README
+++ b/README
@@ -1,15 +1,16 @@
-README for libpng version 1.6.24 - August 4, 2016 (shared library 16.0)
-See the note about version numbers near the top of png.h
+README for libpng version 1.6.37 - April 14, 2019
+=================================================
+See the note about version numbers near the top of png.h.
See INSTALL for instructions on how to install libpng.
Libpng comes in several distribution formats. Get libpng-*.tar.gz or
-libpng-*.tar.xz or if you want UNIX-style line endings in the text files,
-or lpng*.7z or lpng*.zip if you want DOS-style line endings.
+libpng-*.tar.xz or if you want UNIX-style line endings in the text
+files, or lpng*.7z or lpng*.zip if you want DOS-style line endings.
Version 0.89 was the first official release of libpng. Don't let the
-fact that it's the first release fool you. The libpng library has been in
-extensive use and testing since mid-1995. By late 1997 it had
+fact that it's the first release fool you. The libpng library has been
+in extensive use and testing since mid-1995. By late 1997 it had
finally gotten to the stage where there hadn't been significant
changes to the API in some time, and people have a bad feeling about
libraries with versions < 1.0. Version 1.0.0 was released in
@@ -23,7 +24,7 @@
png_uint_32, which will affect shared-library applications that use
this function.
-To avoid problems with changes to the internals of png info_struct,
+To avoid problems with changes to the internals of the png info_struct,
new APIs have been made available in 0.95 to avoid direct application
access to info_ptr. These functions are the png_set_<chunk> and
png_get_<chunk> functions. These functions should be used when
@@ -60,94 +61,59 @@
to set different actions based on whether the CRC error occurred in a
critical or an ancillary chunk.
-The changes made to the library, and bugs fixed are based on discussions
-on the PNG-implement mailing list and not on material submitted
-privately to Guy, Andreas, or Glenn. They will forward any good
-suggestions to the list.
-
-For a detailed description on using libpng, read libpng-manual.txt. For
-examples of libpng in a program, see example.c and pngtest.c. For usage
-information and restrictions (what little they are) on libpng, see
-png.h. For a description on using zlib (the compression library used by
-libpng) and zlib's restrictions, see zlib.h
+For a detailed description on using libpng, read libpng-manual.txt.
+For examples of libpng in a program, see example.c and pngtest.c. For
+usage information and restrictions (what little they are) on libpng,
+see png.h. For a description on using zlib (the compression library
+used by libpng) and zlib's restrictions, see zlib.h
I have included a general makefile, as well as several machine and
-compiler specific ones, but you may have to modify one for your own needs.
+compiler specific ones, but you may have to modify one for your own
+needs.
You should use zlib 1.0.4 or later to run this, but it MAY work with
versions as old as zlib 0.95. Even so, there are bugs in older zlib
versions which can cause the output of invalid compression streams for
-some images. You will definitely need zlib 1.0.4 or later if you are
-taking advantage of the MS-DOS "far" structure allocation for the small
-and medium memory models. You should also note that zlib is a
-compression library that is useful for more things than just PNG files.
-You can use zlib as a drop-in replacement for fread() and fwrite() if
-you are so inclined.
+some images.
-zlib should be available at the same place that libpng is, or at zlib.net.
+You should also note that zlib is a compression library that is useful
+for more things than just PNG files. You can use zlib as a drop-in
+replacement for fread() and fwrite(), if you are so inclined.
+
+zlib should be available at the same place that libpng is, or at
+https://zlib.net.
You may also want a copy of the PNG specification. It is available
as an RFC, a W3C Recommendation, and an ISO/IEC Standard. You can find
-these at http://www.libpng.org/pub/png/documents/
+these at http://www.libpng.org/pub/png/pngdocs.html .
-This code is currently being archived at libpng.sf.net in the
-[DOWNLOAD] area, and at ftp://ftp.simplesystems.org. If you can't find it
-in any of those places, e-mail me, and I'll help you find it.
+This code is currently being archived at libpng.sourceforge.io in the
+[DOWNLOAD] area, and at http://libpng.download/src .
-I am not a lawyer, but I believe that the Export Control Classification
-Number (ECCN) for libpng is EAR99, which means not subject to export
-controls or International Traffic in Arms Regulations (ITAR) because it
-is open source, publicly available software, that does not contain any
-encryption software. See the EAR, paragraphs 734.3(b)(3) and 734.7(b).
-
-If you have any code changes, requests, problems, etc., please e-mail
-them to me. Also, I'd appreciate any make files or project files,
-and any modifications you needed to make to get libpng to compile,
-along with a #define variable to tell what compiler/system you are on.
-If you needed to add transformations to libpng, or wish libpng would
-provide the image in a different way, drop me a note (and code, if
-possible), so I can consider supporting the transformation.
-Finally, if you get any warning messages when compiling libpng
-(note: not zlib), and they are easy to fix, I'd appreciate the
-fix. Please mention "libpng" somewhere in the subject line. Thanks.
-
-This release was created and will be supported by myself (of course
-based in a large way on Guy's and Andreas' earlier work), and the PNG
+This release, based in a large way on Glenn's, Guy's and Andreas'
+earlier work, was created and will be supported by myself and the PNG
development group.
Send comments/corrections/commendations to png-mng-implement at
lists.sourceforge.net (subscription required; visit
https://lists.sourceforge.net/lists/listinfo/png-mng-implement
-to subscribe) or to glennrp at users.sourceforge.net
+to subscribe).
-You can't reach Guy, the original libpng author, at the addresses
-given in previous versions of this document. He and Andreas will
-read mail addressed to the png-implement list, however.
-
-Please do not send general questions about PNG. Send them to
-png-mng-misc at lists.sf.net (subscription required; visit
+Send general questions about the PNG specification to png-mng-misc
+at lists.sourceforge.net (subscription required; visit
https://lists.sourceforge.net/lists/listinfo/png-mng-misc to
-subscribe). If you have a question about something
-in the PNG specification that is related to using libpng, send it
-to me. Send me any questions that start with "I was using libpng,
-and ...". If in doubt, send questions to me. I'll bounce them
-to others, if necessary.
-
-Please do not send suggestions on how to change PNG. We have
-been discussing PNG for twenty years now, and it is official and
-finished. If you have suggestions for libpng, however, I'll
-gladly listen. Even if your suggestion is not used immediately,
-it may be used later.
+subscribe).
Files in this distribution:
ANNOUNCE => Announcement of this version, with recent changes
+ AUTHORS => List of contributing authors
CHANGES => Description of changes between libpng versions
KNOWNBUG => List of known bugs and deficiencies
LICENSE => License to use and redistribute libpng
README => This file
TODO => Things not implemented in the current library
- Y2KINFO => Statement of Y2K compliance
+ TRADEMARK => Trademark information
example.c => Example code for using libpng functions
libpng.3 => manual page for libpng (includes libpng-manual.txt)
libpng-manual.txt => Description of libpng and its functions
@@ -179,18 +145,25 @@
pngwtran.c => Write data transformations
pngwutil.c => Write utility functions
arm => Contains optimized code for the ARM platform
+ powerpc => Contains optimized code for the PowerPC platform
contrib => Contributions
+ arm-neon => Optimized code for ARM-NEON platform
+ powerpc-vsx => Optimized code for POWERPC-VSX platform
examples => Example programs
gregbook => source code for PNG reading and writing, from
Greg Roelofs' "PNG: The Definitive Guide",
O'Reilly, 1999
libtests => Test programs
+ mips-msa => Optimized code for MIPS-MSA platform
pngminim => Minimal decoder, encoder, and progressive decoder
programs demonstrating use of pngusr.dfa
pngminus => Simple pnm2png and png2pnm programs
pngsuite => Test images
+ testpngs
tools => Various tools
visupng => Contains a MSVC workspace for VisualPng
+ intel => Optimized code for INTEL-SSE2 platform
+ mips => Optimized code for MIPS platform
projects => Contains project files and workspaces for
building a DLL
owatcom => Contains a WATCOM project for building libpng
@@ -201,15 +174,10 @@
scripts => Directory containing scripts for building libpng:
(see scripts/README.txt for the list of scripts)
-Good luck, and happy coding.
+Good luck, and happy coding!
--Glenn Randers-Pehrson (current maintainer, since 1998)
- Internet: glennrp at users.sourceforge.net
-
--Andreas Eric Dilger (former maintainer, 1996-1997)
- Internet: adilger at enel.ucalgary.ca
- Web: http://www-mddsp.enel.ucalgary.ca/People/adilger/
-
--Guy Eric Schalnat (original author and former maintainer, 1995-1996)
- (formerly of Group 42, Inc)
- Internet: gschal at infinet.com
+ * Cosmin Truta (current maintainer, since 2018)
+ * Glenn Randers-Pehrson (former maintainer, 1998-2018)
+ * Andreas Eric Dilger (former maintainer, 1996-1997)
+ * Guy Eric Schalnat (original author and former maintainer, 1995-1996)
+ (formerly of Group 42, Inc.)
diff --git a/README.fuchsia b/README.fuchsia
index f6085ff..1435241 100644
--- a/README.fuchsia
+++ b/README.fuchsia
@@ -1,24 +1,21 @@
Name: libpng
URL: http://libpng.org/
Upstream Git: https://github.com/glennrp/libpng
-Version: 1.6.24
+Version: 1.6.37
Security Critical: yes
License: libpng license
License File: LICENSE
License Android Compatible: yes
Description:
-Updated to 1.6.24, stripped all unneeded files.
+Updated to 1.6.37, stripped all unneeded files.
-- Turn on SSE optimizations for Intel platforms by running:
- "patch -i contrib/intel/intel_sse.patch -p1"
- Strip all unneeded files
- mv contrib/intel contrib_intel_temp # Move contrib/intel temporarily.
- rm -r projects scripts tests \
+ rm -r contrib projects scripts tests \
ANNOUNCE CHANGES INSTALL TODO autogen.sh configure.ac CMakeLists.txt Makefile.am \
- *.in *.3 *.5 *.png *.jpg *.dfa libpng-manual.txt \
- contrib/*
- mv contrib_intel_temp contrib/intel # Move contrib/intel back.
+ aclocal.m4 compile config.guess config.sub configure depcomp install.sh ltmain.sh \
+ missing test-driver libpng-manual.txt \
+ *.in *.3 *.5 *.png *.jpg *.dfa
- Use custom configuration file pnglibconf.h, which turns off all features that
are not in use.
diff --git a/TRADEMARK b/TRADEMARK
new file mode 100644
index 0000000..ac66718
--- /dev/null
+++ b/TRADEMARK
@@ -0,0 +1,8 @@
+TRADEMARK
+=========
+
+The name "libpng" has not been registered by the Copyright owners
+as a trademark in any jurisdiction. However, because libpng has
+been distributed and maintained world-wide, continually since 1995,
+the Copyright owners claim "common-law trademark protection" in any
+jurisdiction where common-law trademark is recognized.
diff --git a/arm/arm_init.c b/arm/arm_init.c
index 02df812..a34ecdb 100644
--- a/arm/arm_init.c
+++ b/arm/arm_init.c
@@ -1,14 +1,15 @@
/* arm_init.c - NEON optimised filter functions
*
+ * Copyright (c) 2018 Cosmin Truta
* Copyright (c) 2014,2016 Glenn Randers-Pehrson
* Written by Mans Rullgard, 2011.
- * Last changed in libpng 1.6.22 [May 26, 2016]
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
* and license in png.h
*/
+
/* Below, after checking __linux__, various non-C90 POSIX 1003.1 functions are
* called.
*/
diff --git a/arm/filter_neon.S b/arm/filter_neon.S
index 3b061d6..2308aad 100644
--- a/arm/filter_neon.S
+++ b/arm/filter_neon.S
@@ -1,9 +1,9 @@
/* filter_neon.S - NEON optimised filter functions
*
- * Copyright (c) 2014 Glenn Randers-Pehrson
+ * Copyright (c) 2018 Cosmin Truta
+ * Copyright (c) 2014,2017 Glenn Randers-Pehrson
* Written by Mans Rullgard, 2011.
- * Last changed in libpng 1.6.16 [December 22, 2014]
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
@@ -16,7 +16,7 @@
#define PNG_VERSION_INFO_ONLY
#include "../pngpriv.h"
-#if defined(__linux__) && defined(__ELF__)
+#if (defined(__linux__) || defined(__FreeBSD__)) && defined(__ELF__)
.section .note.GNU-stack,"",%progbits /* mark stack as non-executable */
#endif
diff --git a/arm/filter_neon_intrinsics.c b/arm/filter_neon_intrinsics.c
index ea7e356..553c0be 100644
--- a/arm/filter_neon_intrinsics.c
+++ b/arm/filter_neon_intrinsics.c
@@ -1,12 +1,11 @@
/* filter_neon_intrinsics.c - NEON optimised filter functions
*
+ * Copyright (c) 2018 Cosmin Truta
* Copyright (c) 2014,2016 Glenn Randers-Pehrson
* Written by James Yu <james.yu at linaro.org>, October 2013.
* Based on filter_neon.S, written by Mans Rullgard, 2011.
*
- * Last changed in libpng 1.6.22 [May 26, 2016]
- *
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
* and license in png.h
@@ -19,7 +18,11 @@
/* This code requires -mfpu=neon on the command line: */
#if PNG_ARM_NEON_IMPLEMENTATION == 1 /* intrinsics code from pngpriv.h */
-#include <arm_neon.h>
+#if defined(_MSC_VER) && defined(_M_ARM64)
+# include <arm64_neon.h>
+#else
+# include <arm_neon.h>
+#endif
/* libpng row pointers are not necessarily aligned to any particular boundary,
* however this code will only work with appropriate alignment. arm/arm_init.c
@@ -33,6 +36,11 @@
* 'type'. This is written this way just to hide the GCC strict aliasing
* warning; note that the code is safe because there never is an alias between
* the input and output pointers.
+ *
+ * When compiling with MSVC ARM64, the png_ldr macro can't be passed directly
+ * to vst4_lane_u32, because of an internal compiler error inside MSVC.
+ * To avoid this compiler bug, we use a temporary variable (vdest_val) to store
+ * the result of png_ldr.
*/
#define png_ldr(type,pointer)\
(temp_pointer = png_ptr(type,pointer), *temp_pointer)
@@ -125,12 +133,15 @@
uint8x8x4_t *vrpt = png_ptr(uint8x8x4_t,&vtmp);
uint8x8x4_t vrp = *vrpt;
uint32x2x4_t *temp_pointer;
+ uint32x2x4_t vdest_val;
vdest.val[0] = vadd_u8(vdest.val[3], vrp.val[0]);
vdest.val[1] = vadd_u8(vdest.val[0], vrp.val[1]);
vdest.val[2] = vadd_u8(vdest.val[1], vrp.val[2]);
vdest.val[3] = vadd_u8(vdest.val[2], vrp.val[3]);
- vst4_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2x4_t,&vdest), 0);
+
+ vdest_val = png_ldr(uint32x2x4_t, &vdest);
+ vst4_lane_u32(png_ptr(uint32_t,rp), vdest_val, 0);
}
PNG_UNUSED(prev_row)
@@ -223,6 +234,7 @@
uint8x8x4_t *vrpt, *vppt;
uint8x8x4_t vrp, vpp;
uint32x2x4_t *temp_pointer;
+ uint32x2x4_t vdest_val;
vtmp = vld4_u32(png_ptr(uint32_t,rp));
vrpt = png_ptr(uint8x8x4_t,&vtmp);
@@ -240,7 +252,8 @@
vdest.val[3] = vhadd_u8(vdest.val[2], vpp.val[3]);
vdest.val[3] = vadd_u8(vdest.val[3], vrp.val[3]);
- vst4_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2x4_t,&vdest), 0);
+ vdest_val = png_ldr(uint32x2x4_t, &vdest);
+ vst4_lane_u32(png_ptr(uint32_t,rp), vdest_val, 0);
}
}
@@ -359,6 +372,7 @@
uint8x8x4_t *vrpt, *vppt;
uint8x8x4_t vrp, vpp;
uint32x2x4_t *temp_pointer;
+ uint32x2x4_t vdest_val;
vtmp = vld4_u32(png_ptr(uint32_t,rp));
vrpt = png_ptr(uint8x8x4_t,&vtmp);
@@ -378,7 +392,8 @@
vlast = vpp.val[3];
- vst4_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2x4_t,&vdest), 0);
+ vdest_val = png_ldr(uint32x2x4_t, &vdest);
+ vst4_lane_u32(png_ptr(uint32_t,rp), vdest_val, 0);
}
}
diff --git a/arm/palette_neon_intrinsics.c b/arm/palette_neon_intrinsics.c
new file mode 100644
index 0000000..b4d1fd2
--- /dev/null
+++ b/arm/palette_neon_intrinsics.c
@@ -0,0 +1,149 @@
+
+/* palette_neon_intrinsics.c - NEON optimised palette expansion functions
+ *
+ * Copyright (c) 2018-2019 Cosmin Truta
+ * Copyright (c) 2017-2018 Arm Holdings. All rights reserved.
+ * Written by Richard Townsend <Richard.Townsend@arm.com>, February 2017.
+ *
+ * This code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
+ */
+
+#include "../pngpriv.h"
+
+#if PNG_ARM_NEON_IMPLEMENTATION == 1
+
+#if defined(_MSC_VER) && defined(_M_ARM64)
+# include <arm64_neon.h>
+#else
+# include <arm_neon.h>
+#endif
+
+/* Build an RGBA8 palette from the separate RGB and alpha palettes. */
+void
+png_riffle_palette_neon(png_structrp png_ptr)
+{
+ png_const_colorp palette = png_ptr->palette;
+ png_bytep riffled_palette = png_ptr->riffled_palette;
+ png_const_bytep trans_alpha = png_ptr->trans_alpha;
+ int num_trans = png_ptr->num_trans;
+ int i;
+
+ png_debug(1, "in png_riffle_palette_neon");
+
+ /* Initially black, opaque. */
+ uint8x16x4_t w = {{
+ vdupq_n_u8(0x00),
+ vdupq_n_u8(0x00),
+ vdupq_n_u8(0x00),
+ vdupq_n_u8(0xff),
+ }};
+
+ /* First, riffle the RGB colours into an RGBA8 palette.
+ * The alpha component is set to opaque for now.
+ */
+ for (i = 0; i < 256; i += 16)
+ {
+ uint8x16x3_t v = vld3q_u8((png_const_bytep)(palette + i));
+ w.val[0] = v.val[0];
+ w.val[1] = v.val[1];
+ w.val[2] = v.val[2];
+ vst4q_u8(riffled_palette + (i << 2), w);
+ }
+
+ /* Fix up the missing transparency values. */
+ for (i = 0; i < num_trans; i++)
+ riffled_palette[(i << 2) + 3] = trans_alpha[i];
+}
+
+/* Expands a palettized row into RGBA8. */
+int
+png_do_expand_palette_rgba8_neon(png_structrp png_ptr, png_row_infop row_info,
+ png_const_bytep row, png_bytepp ssp, png_bytepp ddp)
+{
+ png_uint_32 row_width = row_info->width;
+ const png_uint_32 *riffled_palette =
+ (const png_uint_32 *)png_ptr->riffled_palette;
+ const png_int_32 pixels_per_chunk = 4;
+ int i;
+
+ png_debug(1, "in png_do_expand_palette_rgba8_neon");
+
+ if (row_width < pixels_per_chunk)
+ return 0;
+
+ /* This function originally gets the last byte of the output row.
+ * The NEON part writes forward from a given position, so we have
+ * to seek this back by 4 pixels x 4 bytes.
+ */
+ *ddp = *ddp - ((pixels_per_chunk * sizeof(png_uint_32)) - 1);
+
+ for (i = 0; i < row_width; i += pixels_per_chunk)
+ {
+ uint32x4_t cur;
+ png_bytep sp = *ssp - i, dp = *ddp - (i << 2);
+ cur = vld1q_dup_u32 (riffled_palette + *(sp - 3));
+ cur = vld1q_lane_u32(riffled_palette + *(sp - 2), cur, 1);
+ cur = vld1q_lane_u32(riffled_palette + *(sp - 1), cur, 2);
+ cur = vld1q_lane_u32(riffled_palette + *(sp - 0), cur, 3);
+ vst1q_u32((void *)dp, cur);
+ }
+ if (i != row_width)
+ {
+ /* Remove the amount that wasn't processed. */
+ i -= pixels_per_chunk;
+ }
+
+ /* Decrement output pointers. */
+ *ssp = *ssp - i;
+ *ddp = *ddp - (i << 2);
+ return i;
+}
+
+/* Expands a palettized row into RGB8. */
+int
+png_do_expand_palette_rgb8_neon(png_structrp png_ptr, png_row_infop row_info,
+ png_const_bytep row, png_bytepp ssp, png_bytepp ddp)
+{
+ png_uint_32 row_width = row_info->width;
+ png_const_bytep palette = (png_const_bytep)png_ptr->palette;
+ const png_uint_32 pixels_per_chunk = 8;
+ int i;
+
+ png_debug(1, "in png_do_expand_palette_rgb8_neon");
+
+ if (row_width <= pixels_per_chunk)
+ return 0;
+
+ /* Seeking this back by 8 pixels x 3 bytes. */
+ *ddp = *ddp - ((pixels_per_chunk * sizeof(png_color)) - 1);
+
+ for (i = 0; i < row_width; i += pixels_per_chunk)
+ {
+ uint8x8x3_t cur;
+ png_bytep sp = *ssp - i, dp = *ddp - ((i << 1) + i);
+ cur = vld3_dup_u8(palette + sizeof(png_color) * (*(sp - 7)));
+ cur = vld3_lane_u8(palette + sizeof(png_color) * (*(sp - 6)), cur, 1);
+ cur = vld3_lane_u8(palette + sizeof(png_color) * (*(sp - 5)), cur, 2);
+ cur = vld3_lane_u8(palette + sizeof(png_color) * (*(sp - 4)), cur, 3);
+ cur = vld3_lane_u8(palette + sizeof(png_color) * (*(sp - 3)), cur, 4);
+ cur = vld3_lane_u8(palette + sizeof(png_color) * (*(sp - 2)), cur, 5);
+ cur = vld3_lane_u8(palette + sizeof(png_color) * (*(sp - 1)), cur, 6);
+ cur = vld3_lane_u8(palette + sizeof(png_color) * (*(sp - 0)), cur, 7);
+ vst3_u8((void *)dp, cur);
+ }
+
+ if (i != row_width)
+ {
+ /* Remove the amount that wasn't processed. */
+ i -= pixels_per_chunk;
+ }
+
+ /* Decrement output pointers. */
+ *ssp = *ssp - i;
+ *ddp = *ddp - ((i << 1) + i);
+ return i;
+}
+
+#endif /* PNG_ARM_NEON_IMPLEMENTATION */
diff --git a/contrib/intel/INSTALL b/contrib/intel/INSTALL
deleted file mode 100644
index cd5cdd9..0000000
--- a/contrib/intel/INSTALL
+++ /dev/null
@@ -1,158 +0,0 @@
-Enabling SSE support
-
-Copyright (c) 2016 Google, Inc.
-Written by Mike Klein, Matt Sarett
-
-This INSTALL file written by Glenn Randers-Pehrson, 2016.
-
-If you have moved intel_init.c and filter_sse2_intrinsics.c to a different
-directory, be sure to update the '#include "../../pngpriv.h"' line in both
-files if necessary to point to the correct relative location of pngpriv.h
-with respect to the new location of those files.
-
-To enable SSE support in libpng, follow the instructions in I, II, or III,
-below:
-
-I. Using patched "configure" scripts:
-
-First, apply intel_sse.patch in your build directory.
-
- patch -i contrib/intel/intel_sse.patch -p1
-
-Then, if you are not building in a new GIT clone, e.g., in a tar
-distribution, remove any existing pre-built configure scripts:
-
- ./configure --enable-maintainer-mode
- make maintainer-clean
- ./autogen.sh --maintainer --clean
-
-Finally, configure libpng with -DPNG_INTEL_SSE in CPPFLAGS:
-
- ./autogen.sh --maintainer
- CPPFLAGS="-DPNG_INTEL_SSE" ./configure [options]
- make CPPFLAGS="-DPNG_INTEL_SSE" [options]
- make
-
-II. Using a custom makefile:
-
-If you are using a custom makefile makefile, you will have to update it
-manually to include contrib/intel/*.o in the dependencies, and to define
-PNG_INTEL_SSE.
-
-III. Using manually updated "configure" scripts:
-
-If you prefer, manually edit pngpriv.h, configure.ac, and Makefile.am,
-following the instructions below, then follow the instructions in
-section II of INSTALL in the main libpng directory, then configure libpng
-with -DPNG_INTEL_SSE in CPPFLAGS.
-
-1. Add the following code to configure.ac under HOST SPECIFIC OPTIONS
-directly beneath the section for ARM:
-
------------------cut----------------
-# INTEL
-# =====
-#
-# INTEL SSE (SIMD) support.
-
-AC_ARG_ENABLE([intel-sse],
- AS_HELP_STRING([[[--enable-intel-sse]]],
- [Enable Intel SSE optimizations: =no/off, yes/on:]
- [no/off: disable the optimizations;]
- [yes/on: enable the optimizations.]
- [If not specified: determined by the compiler.]),
- [case "$enableval" in
- no|off)
- # disable the default enabling:
- AC_DEFINE([PNG_INTEL_SSE_OPT], [0],
- [Disable Intel SSE optimizations])
- # Prevent inclusion of the assembler files below:
- enable_intel_sse=no;;
- yes|on)
- AC_DEFINE([PNG_INTEL_SSE_OPT], [1],
- [Enable Intel SSE optimizations]);;
- *)
- AC_MSG_ERROR([--enable-intel-sse=${enable_intel_sse}: invalid value])
- esac])
-
-# Add Intel specific files to all builds where the host_cpu is Intel ('x86*')
-# or where Intel optimizations were explicitly requested (this allows a
-# fallback if a future host CPU does not match 'x86*')
-AM_CONDITIONAL([PNG_INTEL_SSE],
- [test "$enable_intel_sse" != 'no' &&
- case "$host_cpu" in
- i?86|x86_64) :;;
- *) test "$enable_intel_sse" != '';;
- esac])
------------------cut----------------
-
-2. Add the following code to Makefile.am under HOST SPECIFIC OPTIONS
-directly beneath the "if PNG_ARM_NEON ... endif" statement:
-
------------------cut----------------
-if PNG_INTEL_SSE
-libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_SOURCES += contrib/intel/intel_init.c\
- contrib/intel/filter_sse2_intrinsics.c
-endif
------------------cut----------------
-
-3. Add the following lines to pngpriv.h, following the PNG_ARM_NEON_OPT
-code:
-
------------------cut----------------
-#ifndef PNG_INTEL_SSE_OPT
-# ifdef PNG_INTEL_SSE
- /* Only check for SSE if the build configuration has been modified to
- * enable SSE optimizations. This means that these optimizations will
- * be off by default. See contrib/intel for more details.
- */
-# if defined(__SSE4_1__) || defined(__AVX__) || defined(__SSSE3__) || \
- defined(__SSE2__) || defined(_M_X64) || defined(_M_AMD64) || \
- (defined(_M_IX86_FP) && _M_IX86_FP >= 2)
-# define PNG_INTEL_SSE_OPT 1
-# endif
-# endif
-#endif
-
-#if PNG_INTEL_SSE_OPT > 0
-# ifndef PNG_INTEL_SSE_IMPLEMENTATION
-# if defined(__SSE4_1__) || defined(__AVX__)
- /* We are not actually using AVX, but checking for AVX is the best
- way we can detect SSE4.1 and SSSE3 on MSVC.
- */
-# define PNG_INTEL_SSE_IMPLEMENTATION 3
-# elif defined(__SSSE3__)
-# define PNG_INTEL_SSE_IMPLEMENTATION 2
-# elif defined(__SSE2__) || defined(_M_X64) || defined(_M_AMD64) || \
- (defined(_M_IX86_FP) && _M_IX86_FP >= 2)
-# define PNG_INTEL_SSE_IMPLEMENTATION 1
-# else
-# define PNG_INTEL_SSE_IMPLEMENTATION 0
-# endif
-# endif
-
-# if PNG_INTEL_SSE_IMPLEMENTATION > 0
-# define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_sse2
-# endif
-#endif
-
------------------cut----------------
-
-4. Add the following lines to pngpriv.h, following the prototype for
-png_read_filter_row_paeth4_neon:
-
------------------cut----------------
-PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_sse2,(png_row_infop
- row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
-PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_sse2,(png_row_infop
- row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
-PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_sse2,(png_row_infop
- row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
-PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_sse2,(png_row_infop
- row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
-PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_sse2,(png_row_infop
- row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
-PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_sse2,(png_row_infop
- row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
-
------------------cut----------------
diff --git a/contrib/intel/intel_sse.patch b/contrib/intel/intel_sse.patch
deleted file mode 100644
index c5579e3..0000000
--- a/contrib/intel/intel_sse.patch
+++ /dev/null
@@ -1,187 +0,0 @@
-diff --git a/configure.ac b/configure.ac
---- a/configure.ac 2016-05-25 18:59:10.000000000 -0400
-+++ b/configure.ac 2016-05-25 19:48:10.631751170 -0400
-@@ -341,16 +341,50 @@ AC_ARG_ENABLE([arm-neon],
-
- AM_CONDITIONAL([PNG_ARM_NEON],
- [test "$enable_arm_neon" != 'no' &&
- case "$host_cpu" in
- arm*|aarch64*) :;;
- *) test "$enable_arm_neon" != '';;
- esac])
-
-+# INTEL
-+# =====
-+#
-+# INTEL SSE (SIMD) support.
-+
-+AC_ARG_ENABLE([intel-sse],
-+ AS_HELP_STRING([[[--enable-intel-sse]]],
-+ [Enable Intel SSE optimizations: =no/off, yes/on:]
-+ [no/off: disable the optimizations;]
-+ [yes/on: enable the optimizations.]
-+ [If not specified: determined by the compiler.]),
-+ [case "$enableval" in
-+ no|off)
-+ # disable the default enabling:
-+ AC_DEFINE([PNG_INTEL_SSE_OPT], [0],
-+ [Disable Intel SSE optimizations])
-+ # Prevent inclusion of the assembler files below:
-+ enable_intel_sse=no;;
-+ yes|on)
-+ AC_DEFINE([PNG_INTEL_SSE_OPT], [1],
-+ [Enable Intel SSE optimizations]);;
-+ *)
-+ AC_MSG_ERROR([--enable-intel-sse=${enable_intel_sse}: invalid value])
-+ esac])
-+
-+# Add Intel specific files to all builds where the host_cpu is Intel ('x86*')
-+# or where Intel optimizations were explicitly requested (this allows a
-+# fallback if a future host CPU does not match 'x86*')
-+AM_CONDITIONAL([PNG_INTEL_SSE],
-+ [test "$enable_intel_sse" != 'no' &&
-+ case "$host_cpu" in
-+ i?86|x86_64) :;;
-+ *) test "$enable_intel_sse" != '';;
-+ esac])
- AC_MSG_NOTICE([[Extra options for compiler: $PNG_COPTS]])
-
- # Config files, substituting as above
- AC_CONFIG_FILES([Makefile libpng.pc:libpng.pc.in])
- AC_CONFIG_FILES([libpng-config:libpng-config.in],
- [chmod +x libpng-config])
-
- AC_OUTPUT
-diff --git a/Makefile.am b/Makefile.am
---- a/Makefile.am 2016-05-17 18:15:12.000000000 -0400
-+++ b/Makefile.am 2016-05-25 19:48:10.631751170 -0400
-@@ -92,16 +92,20 @@ libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_SO
- pngset.c pngtrans.c pngwio.c pngwrite.c pngwtran.c pngwutil.c\
- png.h pngconf.h pngdebug.h pnginfo.h pngpriv.h pngstruct.h pngusr.dfa
-
- if PNG_ARM_NEON
- libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_SOURCES += arm/arm_init.c\
- arm/filter_neon.S arm/filter_neon_intrinsics.c
- endif
-
-+if PNG_INTEL_SSE
-+libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_SOURCES += contrib/intel/intel_init.c\
-+ contrib/intel/filter_sse2_intrinsics.c
-+endif
- nodist_libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_SOURCES = pnglibconf.h
-
- libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_LDFLAGS = -no-undefined -export-dynamic \
- -version-number @PNGLIB_MAJOR@@PNGLIB_MINOR@:@PNGLIB_RELEASE@:0
-
- if HAVE_LD_VERSION_SCRIPT
- # Versioned symbols and restricted exports
- if HAVE_SOLARIS_LD
-diff --git a/pngpriv.h b/pngpriv.h
---- a/pngpriv.h 2016-08-01 18:13:38.770128810 -0500
-+++ b/pngpriv.h 2016-08-01 18:50:19.130179017 -0500
-@@ -177,16 +177,52 @@
- # endif /* !PNG_ARM_NEON_IMPLEMENTATION */
-
- # ifndef PNG_ARM_NEON_IMPLEMENTATION
- /* Use the intrinsics code by default. */
- # define PNG_ARM_NEON_IMPLEMENTATION 1
- # endif
- #endif /* PNG_ARM_NEON_OPT > 0 */
-
-+#ifndef PNG_INTEL_SSE_OPT
-+# ifdef PNG_INTEL_SSE
-+ /* Only check for SSE if the build configuration has been modified to
-+ * enable SSE optimizations. This means that these optimizations will
-+ * be off by default. See contrib/intel for more details.
-+ */
-+# if defined(__SSE4_1__) || defined(__AVX__) || defined(__SSSE3__) || \
-+ defined(__SSE2__) || defined(_M_X64) || defined(_M_AMD64) || \
-+ (defined(_M_IX86_FP) && _M_IX86_FP >= 2)
-+# define PNG_INTEL_SSE_OPT 1
-+# endif
-+# endif
-+#endif
-+
-+#if PNG_INTEL_SSE_OPT > 0
-+# ifndef PNG_INTEL_SSE_IMPLEMENTATION
-+# if defined(__SSE4_1__) || defined(__AVX__)
-+ /* We are not actually using AVX, but checking for AVX is the best
-+ way we can detect SSE4.1 and SSSE3 on MSVC.
-+ */
-+# define PNG_INTEL_SSE_IMPLEMENTATION 3
-+# elif defined(__SSSE3__)
-+# define PNG_INTEL_SSE_IMPLEMENTATION 2
-+# elif defined(__SSE2__) || defined(_M_X64) || defined(_M_AMD64) || \
-+ (defined(_M_IX86_FP) && _M_IX86_FP >= 2)
-+# define PNG_INTEL_SSE_IMPLEMENTATION 1
-+# else
-+# define PNG_INTEL_SSE_IMPLEMENTATION 0
-+# endif
-+# endif
-+
-+# if PNG_INTEL_SSE_IMPLEMENTATION > 0
-+# define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_sse2
-+# endif
-+#endif
-+
- /* Is this a build of a DLL where compilation of the object modules requires
- * different preprocessor settings to those required for a simple library? If
- * so PNG_BUILD_DLL must be set.
- *
- * If libpng is used inside a DLL but that DLL does not export the libpng APIs
- * PNG_BUILD_DLL must not be set. To avoid the code below kicking in build a
- * static library of libpng then link the DLL against that.
- */
-@@ -1185,16 +1221,31 @@ PNG_INTERNAL_FUNCTION(void,png_read_filt
- row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
- PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_neon,(png_row_infop
- row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
- PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_neon,(png_row_infop
- row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
- PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_neon,(png_row_infop
- row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
- #endif
-+
-+#if PNG_INTEL_SSE_IMPLEMENTATION > 0
-+PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_sse2,(png_row_infop
-+ row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
-+PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_sse2,(png_row_infop
-+ row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
-+PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_sse2,(png_row_infop
-+ row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
-+PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_sse2,(png_row_infop
-+ row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
-+PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_sse2,(png_row_infop
-+ row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
-+PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_sse2,(png_row_infop
-+ row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
-+#endif
-
- /* Choose the best filter to use and filter the row data */
- PNG_INTERNAL_FUNCTION(void,png_write_find_filter,(png_structrp png_ptr,
- png_row_infop row_info),PNG_EMPTY);
-
- #ifdef PNG_SEQUENTIAL_READ_SUPPORTED
- PNG_INTERNAL_FUNCTION(void,png_read_IDAT_data,(png_structrp png_ptr,
- png_bytep output, png_alloc_size_t avail_out),PNG_EMPTY);
-@@ -1914,16 +1965,20 @@ PNG_INTERNAL_FUNCTION(void, PNG_FILTER_O
- /* List *all* the possible optimizations here - this branch is required if
- * the builder of libpng passes the definition of PNG_FILTER_OPTIMIZATIONS in
- * CFLAGS in place of CPPFLAGS *and* uses symbol prefixing.
- */
- # if PNG_ARM_NEON_OPT > 0
- PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_neon,
- (png_structp png_ptr, unsigned int bpp), PNG_EMPTY);
- # endif
-+# if PNG_INTEL_SSE_IMPLEMENTATION > 0
-+PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_sse2,
-+ (png_structp png_ptr, unsigned int bpp), PNG_EMPTY);
-+# endif
- #endif
-
- PNG_INTERNAL_FUNCTION(png_uint_32, png_check_keyword, (png_structrp png_ptr,
- png_const_charp key, png_bytep new_key), PNG_EMPTY);
-
- /* Maintainer: Put new private prototypes here ^ */
-
- #include "pngdebug.h"
diff --git a/example.c b/example.c
index edc8ba2..2e2afaa 100644
--- a/example.c
+++ b/example.c
@@ -2,18 +2,20 @@
#if 0 /* in case someone actually tries to compile this */
/* example.c - an example of using libpng
- * Last changed in libpng 1.6.24 [August 4, 2016]
+ *
+ * Maintained 2018 Cosmin Truta
* Maintained 1998-2016 Glenn Randers-Pehrson
- * Maintained 1996, 1997 Andreas Dilger)
- * Written 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
+ * Maintained 1996-1997 Andreas Dilger
+ * Written 1995-1996 Guy Eric Schalnat, Group 42, Inc.
+ *
* To the extent possible under law, the authors have waived
* all copyright and related or neighboring rights to this file.
- * This work is published from: United States.
+ * This work is published from: United States, Canada.
*/
/* This is an example of how to use libpng to read and write PNG files.
- * The file libpng-manual.txt is much more verbose then this. If you have not
- * read it, do so first. This was designed to be a starting point of an
+ * The file libpng-manual.txt is much more verbose then this. If you have
+ * not read it, do so first. This was designed to be a starting point of an
* implementation. This is not officially part of libpng, is hereby placed
* in the public domain, and therefore does not require a copyright notice.
*
@@ -24,16 +26,17 @@
* see also the programs in the contrib directory.
*/
-/* The simple, but restricted, approach to reading a PNG file or data stream
- * just requires two function calls, as in the following complete program.
- * Writing a file just needs one function call, so long as the data has an
+/* The simple, but restricted approach to reading a PNG file or data stream
+ * requires just two function calls, as in the following complete program.
+ * Writing a file needs just one function call, so long as the data has an
* appropriate layout.
*
* The following code reads PNG image data from a file and writes it, in a
- * potentially new format, to a new file. While this code will compile there is
- * minimal (insufficient) error checking; for a more realistic version look at
- * contrib/examples/pngtopng.c
+ * potentially new format, to a new file. While this code will compile, there
+ * is minimal (insufficient) error checking. For a more realistic version,
+ * see contrib/examples/pngtopng.c
*/
+
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
@@ -68,28 +71,28 @@
*/
buffer = malloc(PNG_IMAGE_SIZE(image));
- /* If enough memory was available read the image in the desired format
- * then write the result out to the new file. 'background' is not
- * necessary when reading the image because the alpha channel is
+ /* If enough memory was available, read the image in the desired
+ * format, then write the result out to the new file. 'background' is
+ * not necessary when reading the image, because the alpha channel is
* preserved; if it were to be removed, for example if we requested
* PNG_FORMAT_RGB, then either a solid background color would have to
- * be supplied or the output buffer would have to be initialized to the
- * actual background of the image.
+ * be supplied, or the output buffer would have to be initialized to
+ * the actual background of the image.
*
* The fourth argument to png_image_finish_read is the 'row_stride' -
* this is the number of components allocated for the image in each
* row. It has to be at least as big as the value returned by
* PNG_IMAGE_ROW_STRIDE, but if you just allocate space for the
- * default, minimum, size using PNG_IMAGE_SIZE as above you can pass
+ * default, minimum size, using PNG_IMAGE_SIZE as above, you can pass
* zero.
*
* The final argument is a pointer to a buffer for the colormap;
- * colormaps have exactly the same format as a row of image pixels (so
- * you choose what format to make the colormap by setting
+ * colormaps have exactly the same format as a row of image pixels
+ * (so you choose what format to make the colormap by setting
* image.format). A colormap is only returned if
* PNG_FORMAT_FLAG_COLORMAP is also set in image.format, so in this
* case NULL is passed as the final argument. If you do want to force
- * all images into an index/color-mapped format then you can use:
+ * all images into an index/color-mapped format, then you can use:
*
* PNG_IMAGE_COLORMAP_SIZE(image)
*
@@ -111,17 +114,15 @@
exit(0);
}
}
-
else
{
- /* Calling png_free_image is optional unless the simplified API was
- * not run to completion. In this case if there wasn't enough
- * memory for 'buffer' we didn't complete the read, so we must free
- * the image:
+ /* Calling png_image_free is optional unless the simplified API was
+ * not run to completion. In this case, if there wasn't enough
+ * memory for 'buffer', we didn't complete the read, so we must
+ * free the image:
*/
if (buffer == NULL)
- png_free_image(&image);
-
+ png_image_free(&image);
else
free(buffer);
}
@@ -130,65 +131,67 @@
* textual message in the 'png_image' structure:
*/
fprintf(stderr, "pngtopng: error: %s\n", image.message);
- exit (1);
+ exit(1);
}
fprintf(stderr, "pngtopng: usage: pngtopng input-file output-file\n");
- exit(1);
+ exit(2);
}
/* That's it ;-) Of course you probably want to do more with PNG files than
* just converting them all to 32-bit RGBA PNG files; you can do that between
* the call to png_image_finish_read and png_image_write_to_file. You can also
- * ask for the image data to be presented in a number of different formats. You
- * do this by simply changing the 'format' parameter set before allocating the
- * buffer.
+ * ask for the image data to be presented in a number of different formats.
+ * You do this by simply changing the 'format' parameter set before allocating
+ * the buffer.
*
* The format parameter consists of five flags that define various aspects of
- * the image, you can simply add these together to get the format or you can use
- * one of the predefined macros from png.h (as above):
+ * the image. You can simply add these together to get the format, or you can
+ * use one of the predefined macros from png.h (as above):
*
- * PNG_FORMAT_FLAG_COLOR: if set the image will have three color components per
- * pixel (red, green and blue), if not set the image will just have one
+ * PNG_FORMAT_FLAG_COLOR: if set, the image will have three color components
+ * per pixel (red, green and blue); if not set, the image will just have one
* luminance (grayscale) component.
*
- * PNG_FORMAT_FLAG_ALPHA: if set each pixel in the image will have an additional
- * alpha value; a linear value that describes the degree the image pixel
- * covers (overwrites) the contents of the existing pixel on the display.
+ * PNG_FORMAT_FLAG_ALPHA: if set, each pixel in the image will have an
+ * additional alpha value; a linear value that describes the degree the
+ * image pixel covers (overwrites) the contents of the existing pixel on the
+ * display.
*
- * PNG_FORMAT_FLAG_LINEAR: if set the components of each pixel will be returned
- * as a series of 16-bit linear values, if not set the components will be
- * returned as a series of 8-bit values encoded according to the 'sRGB'
- * standard. The 8-bit format is the normal format for images intended for
- * direct display, because almost all display devices do the inverse of the
- * sRGB transformation to the data they receive. The 16-bit format is more
- * common for scientific data and image data that must be further processed;
- * because it is linear simple math can be done on the component values.
- * Regardless of the setting of this flag the alpha channel is always linear,
- * although it will be 8 bits or 16 bits wide as specified by the flag.
+ * PNG_FORMAT_FLAG_LINEAR: if set, the components of each pixel will be
+ * returned as a series of 16-bit linear values; if not set, the components
+ * will be returned as a series of 8-bit values encoded according to the
+ * sRGB standard. The 8-bit format is the normal format for images intended
+ * for direct display, because almost all display devices do the inverse of
+ * the sRGB transformation to the data they receive. The 16-bit format is
+ * more common for scientific data and image data that must be further
+ * processed; because it is linear, simple math can be done on the component
+ * values. Regardless of the setting of this flag, the alpha channel is
+ * always linear, although it will be 8 bits or 16 bits wide as specified by
+ * the flag.
*
- * PNG_FORMAT_FLAG_BGR: if set the components of a color pixel will be returned
- * in the order blue, then green, then red. If not set the pixel components
- * are in the order red, then green, then blue.
+ * PNG_FORMAT_FLAG_BGR: if set, the components of a color pixel will be
+ * returned in the order blue, then green, then red. If not set, the pixel
+ * components are in the order red, then green, then blue.
*
- * PNG_FORMAT_FLAG_AFIRST: if set the alpha channel (if present) precedes the
- * color or grayscale components. If not set the alpha channel follows the
+ * PNG_FORMAT_FLAG_AFIRST: if set, the alpha channel (if present) precedes the
+ * color or grayscale components. If not set, the alpha channel follows the
* components.
*
* You do not have to read directly from a file. You can read from memory or,
* on systems that support it, from a <stdio.h> FILE*. This is controlled by
- * the particular png_image_read_from_ function you call at the start. Likewise
- * on write you can write to a FILE* if your system supports it. Check the
- * macro PNG_STDIO_SUPPORTED to see if stdio support has been included in your
- * libpng build.
+ * the particular png_image_read_from_ function you call at the start.
+ * Likewise, on write, you can write to a FILE* if your system supports it.
+ * Check the macro PNG_STDIO_SUPPORTED to see if stdio support has been
+ * included in your libpng build.
*
- * If you read 16-bit (PNG_FORMAT_FLAG_LINEAR) data you may need to write it in
- * the 8-bit format for display. You do this by setting the convert_to_8bit
+ * If you read 16-bit (PNG_FORMAT_FLAG_LINEAR) data, you may need to write it
+ * in the 8-bit format for display. You do this by setting the convert_to_8bit
* flag to 'true'.
*
* Don't repeatedly convert between the 8-bit and 16-bit forms. There is
- * significant data loss when 16-bit data is converted to the 8-bit encoding and
- * the current libpng implementation of conversion to 16-bit is also
+ * significant data loss when 16-bit data is converted to the 8-bit encoding,
+ * and the current libpng implementation of conversion to 16-bit is also
* significantly lossy. The latter will be fixed in the future, but the former
* is unavoidable - the 8-bit format just doesn't have enough resolution.
*/
@@ -199,10 +202,10 @@
* interfaces.
*
* All these interfaces require that you do your own error handling - your
- * program must be able to arrange for control to return to your own code any
- * time libpng encounters a problem. There are several ways to do this, but the
- * standard way is to use the ANSI-C (C90) <setjmp.h> interface to establish a
- * return point within your own code. You must do this if you do not use the
+ * program must be able to arrange for control to return to your own code, any
+ * time libpng encounters a problem. There are several ways to do this, but
+ * the standard way is to use the <setjmp.h> interface to establish a return
+ * point within your own code. You must do this if you do not use the
* simplified interface (above).
*
* The first step is to include the header files you need, including the libpng
@@ -214,7 +217,7 @@
/* The png_jmpbuf() macro, used in error handling, became available in
* libpng version 1.0.6. If you want to be able to run your code with older
* versions of libpng, you must define the macro yourself (but only if it
- * is not already defined by libpng!).
+ * is not already defined by libpng!)
*/
#ifndef png_jmpbuf
@@ -222,10 +225,10 @@
#endif
/* Check to see if a file is a PNG file using png_sig_cmp(). png_sig_cmp()
- * returns zero if the image is a PNG and nonzero if it isn't a PNG.
+ * returns zero if the image is a PNG, and nonzero otherwise.
*
* The function check_if_png() shown here, but not used, returns nonzero (true)
- * if the file can be opened and is a PNG, 0 (false) otherwise.
+ * if the file can be opened and is a PNG, and 0 (false) otherwise.
*
* If this call is successful, and you are going to keep the file open,
* you should call png_set_sig_bytes(png_ptr, PNG_BYTES_TO_CHECK); once
@@ -238,7 +241,7 @@
*
* Many applications already read the first 2 or 4 bytes from the start
* of the image to determine the file type, so it would be easiest just
- * to pass the bytes to png_sig_cmp() or even skip that if you know
+ * to pass the bytes to png_sig_cmp(), or even skip that if you know
* you have a PNG file, and call png_set_sig_bytes().
*/
#define PNG_BYTES_TO_CHECK 4
@@ -250,14 +253,14 @@
if ((*fp = fopen(file_name, "rb")) == NULL)
return 0;
- /* Read in some of the signature bytes */
+ /* Read in some of the signature bytes. */
if (fread(buf, 1, PNG_BYTES_TO_CHECK, *fp) != PNG_BYTES_TO_CHECK)
return 0;
/* Compare the first PNG_BYTES_TO_CHECK bytes of the signature.
- Return nonzero (true) if they match */
-
- return(!png_sig_cmp(buf, (png_size_t)0, PNG_BYTES_TO_CHECK));
+ * Return nonzero (true) if they match.
+ */
+ return(!png_sig_cmp(buf, 0, PNG_BYTES_TO_CHECK));
}
/* Read a PNG file. You may want to return an error code if the read
@@ -267,7 +270,7 @@
* some or all of the magic bytes read - see comments above).
*/
#ifdef open_file /* prototype 1 */
-void read_png(char *file_name) /* We need to open the file */
+void read_png(char *file_name) /* We need to open the file */
{
png_structp png_ptr;
png_infop info_ptr;
@@ -280,7 +283,7 @@
return (ERROR);
#else no_open_file /* prototype 2 */
-void read_png(FILE *fp, int sig_read) /* File is already open */
+void read_png(FILE *fp, int sig_read) /* File is already open */
{
png_structp png_ptr;
png_infop info_ptr;
@@ -292,7 +295,7 @@
* functions. If you want to use the default stderr and longjump method,
* you can supply NULL for the last three parameters. We also supply the
* the compiler header file version, so that we know if the application
- * was compiled with a compatible version of the library. REQUIRED
+ * was compiled with a compatible version of the library. REQUIRED.
*/
png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING,
png_voidp user_error_ptr, user_error_fn, user_warning_fn);
@@ -316,35 +319,33 @@
* the normal method of doing things with libpng). REQUIRED unless you
* set up your own error handlers in the png_create_read_struct() earlier.
*/
-
if (setjmp(png_jmpbuf(png_ptr)))
{
- /* Free all of the memory associated with the png_ptr and info_ptr */
+ /* Free all of the memory associated with the png_ptr and info_ptr. */
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
fclose(fp);
- /* If we get here, we had a problem reading the file */
+ /* If we get here, we had a problem reading the file. */
return (ERROR);
}
- /* One of the following I/O initialization methods is REQUIRED */
+ /* One of the following I/O initialization methods is REQUIRED. */
#ifdef streams /* PNG file I/O method 1 */
- /* Set up the input control if you are using standard C streams */
+ /* Set up the input control if you are using standard C streams. */
png_init_io(png_ptr, fp);
#else no_streams /* PNG file I/O method 2 */
/* If you are using replacement read functions, instead of calling
- * png_init_io() here you would call:
+ * png_init_io(), you would call:
*/
png_set_read_fn(png_ptr, (void *)user_io_ptr, user_read_fn);
- /* where user_io_ptr is a structure you want available to the callbacks */
+ /* where user_io_ptr is a structure you want available to the callbacks. */
#endif no_streams /* Use only one I/O method! */
/* If we have already read some of the signature */
png_set_sig_bytes(png_ptr, sig_read);
#ifdef hilevel
- /*
- * If you have enough memory to read in the entire image at once,
+ /* If you have enough memory to read in the entire image at once,
* and you need to specify only transforms that can be controlled
* with one of the PNG_TRANSFORM_* bits (this presently excludes
* quantizing, filling, setting background, and doing gamma
@@ -354,10 +355,10 @@
png_read_png(png_ptr, info_ptr, png_transforms, NULL);
#else
- /* OK, you're doing it the hard way, with the lower-level functions */
+ /* OK, you're doing it the hard way, with the lower-level functions. */
/* The call to png_read_info() gives us all of the information from the
- * PNG file before the first IDAT (image data chunk). REQUIRED
+ * PNG file before the first IDAT (image data chunk). REQUIRED.
*/
png_read_info(png_ptr, info_ptr);
@@ -385,20 +386,21 @@
*/
png_set_strip_alpha(png_ptr);
- /* Extract multiple pixels with bit depths of 1, 2, and 4 from a single
+ /* Extract multiple pixels with bit depths of 1, 2 or 4 from a single
* byte into separate bytes (useful for paletted and grayscale images).
*/
png_set_packing(png_ptr);
/* Change the order of packed pixels to least significant bit first
- * (not useful if you are using png_set_packing). */
+ * (not useful if you are using png_set_packing).
+ */
png_set_packswap(png_ptr);
- /* Expand paletted colors into true RGB triplets */
+ /* Expand paletted colors into true RGB triplets. */
if (color_type == PNG_COLOR_TYPE_PALETTE)
png_set_palette_to_rgb(png_ptr);
- /* Expand grayscale images to the full 8 bits from 1, 2, or 4 bits/pixel */
+ /* Expand grayscale images to the full 8 bits from 1, 2 or 4 bits/pixel. */
if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8)
png_set_expand_gray_1_2_4_to_8(png_ptr);
@@ -409,12 +411,11 @@
png_set_tRNS_to_alpha(png_ptr);
/* Set the background color to draw transparent and alpha images over.
- * It is possible to set the red, green, and blue components directly
- * for paletted images instead of supplying a palette index. Note that
+ * It is possible to set the red, green and blue components directly
+ * for paletted images, instead of supplying a palette index. Note that,
* even if the PNG file supplies a background, you are not required to
* use it - you should use the (solid) application background if it has one.
*/
-
png_color_16 my_background, *image_background;
if (png_get_bKGD(png_ptr, info_ptr, &image_background) != 0)
@@ -424,32 +425,29 @@
png_set_background(png_ptr, &my_background,
PNG_BACKGROUND_GAMMA_SCREEN, 0, 1.0);
- /* Some suggestions as to how to get a screen gamma value
+ /* Some suggestions as to how to get a screen gamma value.
*
* Note that screen gamma is the display_exponent, which includes
- * the CRT_exponent and any correction for viewing conditions
+ * the CRT_exponent and any correction for viewing conditions.
*/
if (/* We have a user-defined screen gamma value */)
- {
screen_gamma = user-defined screen_gamma;
- }
- /* This is one way that applications share the same screen gamma value */
+ /* This is one way that applications share the same screen gamma value. */
else if ((gamma_str = getenv("SCREEN_GAMMA")) != NULL)
- {
screen_gamma = atof(gamma_str);
- }
/* If we don't have another value */
else
{
- screen_gamma = PNG_DEFAULT_sRGB; /* A good guess for a PC monitor
- in a dimly lit room */
- screen_gamma = PNG_GAMMA_MAC_18 or 1.0; /* Good guesses for Mac systems */
+ screen_gamma = PNG_DEFAULT_sRGB; /* A good guess for a PC monitor
+ in a dimly lit room */
+ screen_gamma = PNG_GAMMA_MAC_18 or 1.0; /* Good guesses for Mac
+ systems */
}
/* Tell libpng to handle the gamma conversion for you. The final call
* is a good guess for PC generated images, but it should be configurable
- * by the user at run time by the user. It is strongly suggested that
- * your application support gamma correction.
+ * by the user at run time. Gamma correction support in your application
+ * is strongly recommended.
*/
int intent;
@@ -466,7 +464,7 @@
}
#ifdef PNG_READ_QUANTIZE_SUPPORTED
- /* Quantize RGB files down to 8-bit palette or reduce palettes
+ /* Quantize RGB files down to 8-bit palette, or reduce palettes
* to the number of colors available on your screen.
*/
if ((color_type & PNG_COLOR_MASK_COLOR) != 0)
@@ -474,29 +472,26 @@
int num_palette;
png_colorp palette;
- /* This reduces the image to the application supplied palette */
+ /* This reduces the image to the application-supplied palette. */
if (/* We have our own palette */)
{
- /* An array of colors to which the image should be quantized */
+ /* An array of colors to which the image should be quantized. */
png_color std_color_cube[MAX_SCREEN_COLORS];
-
png_set_quantize(png_ptr, std_color_cube, MAX_SCREEN_COLORS,
MAX_SCREEN_COLORS, NULL, 0);
}
- /* This reduces the image to the palette supplied in the file */
+ /* This reduces the image to the palette supplied in the file. */
else if (png_get_PLTE(png_ptr, info_ptr, &palette, &num_palette) != 0)
{
png_uint_16p histogram = NULL;
-
png_get_hIST(png_ptr, info_ptr, &histogram);
-
png_set_quantize(png_ptr, palette, num_palette,
max_screen_colors, histogram, 0);
}
}
#endif /* READ_QUANTIZE */
- /* Invert monochrome files to have 0 as white and 1 as black */
+ /* Invert monochrome files to have 0 as white and 1 as black. */
png_set_invert_mono(png_ptr);
/* If you want to shift the pixel values from the range [0,255] or
@@ -506,22 +501,21 @@
if (png_get_valid(png_ptr, info_ptr, PNG_INFO_sBIT) != 0)
{
png_color_8p sig_bit_p;
-
png_get_sBIT(png_ptr, info_ptr, &sig_bit_p);
png_set_shift(png_ptr, sig_bit_p);
}
- /* Flip the RGB pixels to BGR (or RGBA to BGRA) */
+ /* Flip the RGB pixels to BGR (or RGBA to BGRA). */
if ((color_type & PNG_COLOR_MASK_COLOR) != 0)
png_set_bgr(png_ptr);
- /* Swap the RGBA or GA data to ARGB or AG (or BGRA to ABGR) */
+ /* Swap the RGBA or GA data to ARGB or AG (or BGRA to ABGR). */
png_set_swap_alpha(png_ptr);
- /* Swap bytes of 16-bit files to least significant byte first */
+ /* Swap bytes of 16-bit files to least significant byte first. */
png_set_swap(png_ptr);
- /* Add filler (or alpha) byte (before/after each RGB triplet) */
+ /* Add filler (or alpha) byte (before/after each RGB triplet). */
png_set_filler(png_ptr, 0xffff, PNG_FILLER_AFTER);
#ifdef PNG_READ_INTERLACING_SUPPORTED
@@ -534,40 +528,31 @@
number_passes = 1;
#endif /* READ_INTERLACING */
-
/* Optional call to gamma correct and add the background to the palette
* and update info structure. REQUIRED if you are expecting libpng to
- * update the palette for you (ie you selected such a transform above).
+ * update the palette for you (i.e. you selected such a transform above).
*/
png_read_update_info(png_ptr, info_ptr);
/* Allocate the memory to hold the image using the fields of info_ptr. */
-
- /* The easiest way to read the image: */
png_bytep row_pointers[height];
-
- /* Clear the pointer array */
for (row = 0; row < height; row++)
- row_pointers[row] = NULL;
-
+ row_pointers[row] = NULL; /* Clear the pointer array */
for (row = 0; row < height; row++)
row_pointers[row] = png_malloc(png_ptr, png_get_rowbytes(png_ptr,
info_ptr));
- /* Now it's time to read the image. One of these methods is REQUIRED */
+ /* Now it's time to read the image. One of these methods is REQUIRED. */
#ifdef entire /* Read the entire image in one go */
png_read_image(png_ptr, row_pointers);
#else no_entire /* Read the image one or more scanlines at a time */
/* The other way to read images - deal with interlacing: */
-
for (pass = 0; pass < number_passes; pass++)
{
#ifdef single /* Read the image a single row at a time */
for (y = 0; y < height; y++)
- {
png_read_rows(png_ptr, &row_pointers[y], NULL, 1);
- }
#else no_single /* Read the image several rows at a time */
for (y = 0; y < height; y += number_of_rows)
@@ -581,24 +566,24 @@
#endif no_sparkle /* Use only one of these two methods */
}
- /* If you want to display the image after every pass, do so here */
+ /* If you want to display the image after every pass, do so here. */
#endif no_single /* Use only one of these two methods */
}
#endif no_entire /* Use only one of these two methods */
- /* Read rest of file, and get additional chunks in info_ptr - REQUIRED */
+ /* Read rest of file, and get additional chunks in info_ptr. REQUIRED. */
png_read_end(png_ptr, info_ptr);
#endif hilevel
- /* At this point you have read the entire image */
+ /* At this point you have read the entire image. */
- /* Clean up after the read, and free any memory allocated - REQUIRED */
+ /* Clean up after the read, and free any memory allocated. REQUIRED. */
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
- /* Close the file */
+ /* Close the file. */
fclose(fp);
- /* That's it */
+ /* That's it! */
return (OK);
}
@@ -610,34 +595,30 @@
/* Create and initialize the png_struct with the desired error handler
* functions. If you want to use the default stderr and longjump method,
* you can supply NULL for the last three parameters. We also check that
- * the library version is compatible in case we are using dynamically
+ * the library version is compatible, in case we are using dynamically
* linked libraries.
*/
*png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING,
png_voidp user_error_ptr, user_error_fn, user_warning_fn);
-
if (*png_ptr == NULL)
{
*info_ptr = NULL;
return (ERROR);
}
-
*info_ptr = png_create_info_struct(png_ptr);
-
if (*info_ptr == NULL)
{
png_destroy_read_struct(png_ptr, info_ptr, NULL);
return (ERROR);
}
-
if (setjmp(png_jmpbuf((*png_ptr))))
{
png_destroy_read_struct(png_ptr, info_ptr, NULL);
return (ERROR);
}
- /* This one's new. You will need to provide all three
- * function callbacks, even if you aren't using them all.
+ /* You will need to provide all three function callbacks,
+ * even if you aren't using all of them.
* If you aren't using all functions, you can specify NULL
* parameters. Even when all three functions are NULL,
* you need to call png_set_progressive_read_fn().
@@ -650,7 +631,6 @@
*/
png_set_progressive_read_fn(*png_ptr, (void *)stream_data,
info_callback, row_callback, end_callback);
-
return (OK);
}
@@ -660,18 +640,18 @@
{
if (setjmp(png_jmpbuf((*png_ptr))))
{
- /* Free the png_ptr and info_ptr memory on error */
+ /* Free the png_ptr and info_ptr memory on error. */
png_destroy_read_struct(png_ptr, info_ptr, NULL);
return (ERROR);
}
- /* This one's new also. Simply give it chunks of data as
- * they arrive from the data stream (in order, of course).
+ /* Give chunks of data as they arrive from the data stream
+ * (in order, of course).
* On segmented machines, don't give it any more than 64K.
* The library seems to run fine with sizes of 4K, although
- * you can give it much less if necessary (I assume you can
+ * you can give it much less if necessary. (I assume you can
* give it chunks of 1 byte, but I haven't tried with less
- * than 256 bytes yet). When this function returns, you may
+ * than 256 bytes yet.) When this function returns, you may
* want to display any rows that were generated in the row
* callback, if you aren't already displaying them there.
*/
@@ -693,8 +673,7 @@
row_callback(png_structp png_ptr, png_bytep new_row,
png_uint_32 row_num, int pass)
{
- /*
- * This function is called for every row in the image. If the
+ /* This function is called for every row in the image. If the
* image is interlaced, and you turned on the interlace handler,
* this function will be called for every row in every pass.
*
@@ -705,25 +684,22 @@
* The new row data pointer "new_row" may be NULL, indicating there is
* no new data to be replaced (in cases of interlace loading).
*
- * If new_row is not NULL then you need to call
- * png_progressive_combine_row() to replace the corresponding row as
+ * If new_row is not NULL, then you need to call
+ * png_progressive_combine_row(), to replace the corresponding row as
* shown below:
*/
- /* Get pointer to corresponding row in our
- * PNG read buffer.
- */
+ /* Get pointer to corresponding row in our PNG read buffer. */
png_bytep old_row = ((png_bytep *)our_data)[row_num];
#ifdef PNG_READ_INTERLACING_SUPPORTED
- /* If both rows are allocated then copy the new row
+ /* If both rows are allocated, then copy the new row
* data to the corresponding row data.
*/
- if ((old_row != NULL) && (new_row != NULL))
- png_progressive_combine_row(png_ptr, old_row, new_row);
+ if (old_row != NULL && new_row != NULL)
+ png_progressive_combine_row(png_ptr, old_row, new_row);
- /*
- * The rows and passes are called in order, so you don't really
+ /* The rows and passes are called in order, so you don't really
* need the row_num and pass, but I'm supplying them because it
* may make your life easier.
*
@@ -734,7 +710,6 @@
* (it just does the memcpy for you) if it will make the code
* easier. Thus, you can just do this for all cases:
*/
-
png_progressive_combine_row(png_ptr, old_row, new_row);
/* where old_row is what was displayed for previous rows. Note
@@ -781,14 +756,13 @@
*/
png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING,
png_voidp user_error_ptr, user_error_fn, user_warning_fn);
-
if (png_ptr == NULL)
{
fclose(fp);
return (ERROR);
}
- /* Allocate/initialize the image information data. REQUIRED */
+ /* Allocate/initialize the image information data. REQUIRED. */
info_ptr = png_create_info_struct(png_ptr);
if (info_ptr == NULL)
{
@@ -797,30 +771,30 @@
return (ERROR);
}
- /* Set error handling. REQUIRED if you aren't supplying your own
+ /* Set up error handling. REQUIRED if you aren't supplying your own
* error handling functions in the png_create_write_struct() call.
*/
if (setjmp(png_jmpbuf(png_ptr)))
{
- /* If we get here, we had a problem writing the file */
+ /* If we get here, we had a problem writing the file. */
fclose(fp);
png_destroy_write_struct(&png_ptr, &info_ptr);
return (ERROR);
}
- /* One of the following I/O initialization functions is REQUIRED */
+ /* One of the following I/O initialization functions is REQUIRED. */
#ifdef streams /* I/O initialization method 1 */
- /* Set up the output control if you are using standard C streams */
+ /* Set up the output control if you are using standard C streams. */
png_init_io(png_ptr, fp);
#else no_streams /* I/O initialization method 2 */
/* If you are using replacement write functions, instead of calling
- * png_init_io() here you would call
+ * png_init_io(), you would call:
*/
png_set_write_fn(png_ptr, (void *)user_io_ptr, user_write_fn,
user_IO_flush_function);
- /* where user_io_ptr is a structure you want available to the callbacks */
+ /* where user_io_ptr is a structure you want available to the callbacks. */
#endif no_streams /* Only use one initialization method */
#ifdef hilevel
@@ -831,30 +805,32 @@
png_write_png(png_ptr, info_ptr, png_transforms, NULL);
#else
- /* This is the hard way */
+ /* This is the hard way. */
/* Set the image information here. Width and height are up to 2^31,
- * bit_depth is one of 1, 2, 4, 8, or 16, but valid values also depend on
- * the color_type selected. color_type is one of PNG_COLOR_TYPE_GRAY,
+ * bit_depth is one of 1, 2, 4, 8 or 16, but valid values also depend on
+ * the color_type selected. color_type is one of PNG_COLOR_TYPE_GRAY,
* PNG_COLOR_TYPE_GRAY_ALPHA, PNG_COLOR_TYPE_PALETTE, PNG_COLOR_TYPE_RGB,
* or PNG_COLOR_TYPE_RGB_ALPHA. interlace is either PNG_INTERLACE_NONE or
* PNG_INTERLACE_ADAM7, and the compression_type and filter_type MUST
- * currently be PNG_COMPRESSION_TYPE_BASE and PNG_FILTER_TYPE_BASE. REQUIRED
+ * currently be PNG_COMPRESSION_TYPE_BASE and PNG_FILTER_TYPE_BASE.
+ * REQUIRED.
*/
- png_set_IHDR(png_ptr, info_ptr, width, height, bit_depth, PNG_COLOR_TYPE_???,
- PNG_INTERLACE_????, PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
+ png_set_IHDR(png_ptr, info_ptr, width, height, bit_depth,
+ PNG_COLOR_TYPE_???, PNG_INTERLACE_????,
+ PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
- /* Set the palette if there is one. REQUIRED for indexed-color images */
- palette = (png_colorp)png_malloc(png_ptr, PNG_MAX_PALETTE_LENGTH
- * (sizeof (png_color)));
+ /* Set the palette if there is one. REQUIRED for indexed-color images. */
+ palette = (png_colorp)png_malloc(png_ptr,
+ PNG_MAX_PALETTE_LENGTH * (sizeof (png_color)));
/* ... Set palette colors ... */
png_set_PLTE(png_ptr, info_ptr, palette, PNG_MAX_PALETTE_LENGTH);
- /* You must not free palette here, because png_set_PLTE only makes a link to
- * the palette that you malloced. Wait until you are about to destroy
+ /* You must not free palette here, because png_set_PLTE only makes a link
+ * to the palette that you allocated. Wait until you are about to destroy
* the png structure.
*/
- /* Optional significant bit (sBIT) chunk */
+ /* Optional significant bit (sBIT) chunk. */
png_color_8 sig_bit;
/* If we are dealing with a grayscale image then */
@@ -870,18 +846,17 @@
png_set_sBIT(png_ptr, info_ptr, &sig_bit);
-
/* Optional gamma chunk is strongly suggested if you have any guess
* as to the correct gamma of the image.
*/
png_set_gAMA(png_ptr, info_ptr, gamma);
- /* Optionally write comments into the image */
+ /* Optionally write comments into the image. */
{
png_text text_ptr[3];
- char key0[]="Title";
- char text0[]="Mona Lisa";
+ char key0[] = "Title";
+ char text0[] = "Mona Lisa";
text_ptr[0].key = key0;
text_ptr[0].text = text0;
text_ptr[0].compression = PNG_TEXT_COMPRESSION_NONE;
@@ -889,8 +864,8 @@
text_ptr[0].lang = NULL;
text_ptr[0].lang_key = NULL;
- char key1[]="Author";
- char text1[]="Leonardo DaVinci";
+ char key1[] = "Author";
+ char text1[] = "Leonardo DaVinci";
text_ptr[1].key = key1;
text_ptr[1].text = text1;
text_ptr[1].compression = PNG_TEXT_COMPRESSION_NONE;
@@ -898,8 +873,8 @@
text_ptr[1].lang = NULL;
text_ptr[1].lang_key = NULL;
- char key2[]="Description";
- char text2[]="<long text>";
+ char key2[] = "Description";
+ char text2[] = "<long text>";
text_ptr[2].key = key2;
text_ptr[2].text = text2;
text_ptr[2].compression = PNG_TEXT_COMPRESSION_zTXt;
@@ -910,14 +885,14 @@
png_set_text(write_ptr, write_info_ptr, text_ptr, 3);
}
- /* Other optional chunks like cHRM, bKGD, tRNS, tIME, oFFs, pHYs */
+ /* Other optional chunks like cHRM, bKGD, tRNS, tIME, oFFs, pHYs. */
- /* Note that if sRGB is present the gAMA and cHRM chunks must be ignored
+ /* Note that if sRGB is present, the gAMA and cHRM chunks must be ignored
* on read and, if your application chooses to write them, they must
- * be written in accordance with the sRGB profile
+ * be written in accordance with the sRGB profile.
*/
- /* Write the file header information. REQUIRED */
+ /* Write the file header information. REQUIRED. */
png_write_info(png_ptr, info_ptr);
/* If you want, you can write the info in two steps, in case you need to
@@ -941,7 +916,7 @@
* all optional. Only call them if you want them.
*/
- /* Invert monochrome pixels */
+ /* Invert monochrome pixels. */
png_set_invert_mono(png_ptr);
/* Shift the pixels up to a legal bit depth and fill in
@@ -949,30 +924,29 @@
*/
png_set_shift(png_ptr, &sig_bit);
- /* Pack pixels into bytes */
+ /* Pack pixels into bytes. */
png_set_packing(png_ptr);
- /* Swap location of alpha bytes from ARGB to RGBA */
+ /* Swap location of alpha bytes from ARGB to RGBA. */
png_set_swap_alpha(png_ptr);
/* Get rid of filler (OR ALPHA) bytes, pack XRGB/RGBX/ARGB/RGBA into
- * RGB (4 channels -> 3 channels). The second parameter is not used.
+ * RGB (4 channels -> 3 channels). The second parameter is not used.
*/
png_set_filler(png_ptr, 0, PNG_FILLER_BEFORE);
- /* Flip BGR pixels to RGB */
+ /* Flip BGR pixels to RGB. */
png_set_bgr(png_ptr);
- /* Swap bytes of 16-bit files to most significant byte first */
+ /* Swap bytes of 16-bit files to most significant byte first. */
png_set_swap(png_ptr);
- /* Swap bits of 1-bit, 2-bit, 4-bit packed pixel formats */
+ /* Swap bits of 1-bit, 2-bit, 4-bit packed pixel formats. */
png_set_packswap(png_ptr);
- /* Turn on interlace handling if you are not using png_write_image() */
+ /* Turn on interlace handling if you are not using png_write_image(). */
if (interlacing != 0)
number_passes = png_set_interlace_handling(png_ptr);
-
else
number_passes = 1;
@@ -982,24 +956,28 @@
*/
png_uint_32 k, height, width;
- /* In this example, "image" is a one-dimensional array of bytes */
- png_byte image[height*width*bytes_per_pixel];
+ /* In this example, "image" is a one-dimensional array of bytes. */
+ /* Guard against integer overflow. */
+ if (height > PNG_SIZE_MAX / (width * bytes_per_pixel))
+ png_error(png_ptr, "Image data buffer would be too large");
+
+ png_byte image[height * width * bytes_per_pixel];
png_bytep row_pointers[height];
- if (height > PNG_UINT_32_MAX/(sizeof (png_bytep)))
- png_error (png_ptr, "Image is too tall to process in memory");
+ if (height > PNG_UINT_32_MAX / (sizeof (png_bytep)))
+ png_error(png_ptr, "Image is too tall to process in memory");
- /* Set up pointers into your "image" byte array */
+ /* Set up pointers into your "image" byte array. */
for (k = 0; k < height; k++)
- row_pointers[k] = image + k*width*bytes_per_pixel;
+ row_pointers[k] = image + k * width * bytes_per_pixel;
- /* One of the following output methods is REQUIRED */
+ /* One of the following output methods is REQUIRED. */
#ifdef entire /* Write out the entire image data in one call */
png_write_image(png_ptr, row_pointers);
- /* The other way to write the image - deal with interlacing */
+ /* The other way to write the image - deal with interlacing. */
#else no_entire /* Write out the image data by one or more scanlines */
@@ -1011,27 +989,27 @@
/* Write a few rows at a time. */
png_write_rows(png_ptr, &row_pointers[first_row], number_of_rows);
- /* If you are only writing one row at a time, this works */
+ /* If you are only writing one row at a time, this works. */
for (y = 0; y < height; y++)
png_write_rows(png_ptr, &row_pointers[y], 1);
}
#endif no_entire /* Use only one output method */
/* You can write optional chunks like tEXt, zTXt, and tIME at the end
- * as well. Shouldn't be necessary in 1.2.0 and up as all the public
- * chunks are supported and you can use png_set_unknown_chunks() to
+ * as well. Shouldn't be necessary in 1.2.0 and up, as all the public
+ * chunks are supported, and you can use png_set_unknown_chunks() to
* register unknown chunks into the info structure to be written out.
*/
- /* It is REQUIRED to call this to finish writing the rest of the file */
+ /* It is REQUIRED to call this to finish writing the rest of the file. */
png_write_end(png_ptr, info_ptr);
#endif hilevel
- /* If you png_malloced a palette, free it here (don't free info_ptr->palette,
- * as recommended in versions 1.0.5m and earlier of this example; if
- * libpng mallocs info_ptr->palette, libpng will free it). If you
- * allocated it with malloc() instead of png_malloc(), use free() instead
- * of png_free().
+ /* If you png_malloced a palette, free it here.
+ * (Don't free info_ptr->palette, as shown in versions 1.0.5m and earlier of
+ * this example; if libpng mallocs info_ptr->palette, libpng will free it).
+ * If you allocated it with malloc() instead of png_malloc(), use free()
+ * instead of png_free().
*/
png_free(png_ptr, palette);
palette = NULL;
@@ -1042,19 +1020,20 @@
*/
png_free(png_ptr, trans);
trans = NULL;
- /* Whenever you use png_free() it is a good idea to set the pointer to
+
+ /* Whenever you use png_free(), it is a good idea to set the pointer to
* NULL in case your application inadvertently tries to png_free() it
- * again. When png_free() sees a NULL it returns without action, thus
- * avoiding the double-free security problem.
+ * again. When png_free() sees a NULL it returns without action, avoiding
+ * the double-free problem.
*/
- /* Clean up after the write, and free any memory allocated */
+ /* Clean up after the write, and free any allocated memory. */
png_destroy_write_struct(&png_ptr, &info_ptr);
- /* Close the file */
+ /* Close the file. */
fclose(fp);
- /* That's it */
+ /* That's it! */
return (OK);
}
diff --git a/contrib/intel/filter_sse2_intrinsics.c b/intel/filter_sse2_intrinsics.c
similarity index 81%
rename from contrib/intel/filter_sse2_intrinsics.c
rename to intel/filter_sse2_intrinsics.c
index b02840c..f52aaa8 100644
--- a/contrib/intel/filter_sse2_intrinsics.c
+++ b/intel/filter_sse2_intrinsics.c
@@ -1,19 +1,17 @@
/* filter_sse2_intrinsics.c - SSE2 optimized filter functions
*
- * Copyright (c) 2016 Google, Inc.
+ * Copyright (c) 2018 Cosmin Truta
+ * Copyright (c) 2016-2017 Glenn Randers-Pehrson
* Written by Mike Klein and Matt Sarett
- * Derived from arm/filter_neon_intrinsics.c, which was
- * Copyright (c) 2014,2016 Glenn Randers-Pehrson
- *
- * Last changed in libpng 1.6.24 [August 4, 2016]
+ * Derived from arm/filter_neon_intrinsics.c
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
* and license in png.h
*/
-#include "../../pngpriv.h"
+#include "../pngpriv.h"
#ifdef PNG_READ_SUPPORTED
@@ -30,36 +28,25 @@
*/
static __m128i load4(const void* p) {
- return _mm_cvtsi32_si128(*(const int*)p);
+ int tmp;
+ memcpy(&tmp, p, sizeof(tmp));
+ return _mm_cvtsi32_si128(tmp);
}
static void store4(void* p, __m128i v) {
- *(int*)p = _mm_cvtsi128_si32(v);
+ int tmp = _mm_cvtsi128_si32(v);
+ memcpy(p, &tmp, sizeof(int));
}
static __m128i load3(const void* p) {
- /* We'll load 2 bytes, then 1 byte,
- * then mask them together, and finally load into SSE.
- */
- const png_uint_16* p01 = p;
- const png_byte* p2 = (const png_byte*)(p01+1);
-
- png_uint_32 v012 = (png_uint_32)(*p01)
- | (png_uint_32)(*p2) << 16;
- return load4(&v012);
+ png_uint_32 tmp = 0;
+ memcpy(&tmp, p, 3);
+ return _mm_cvtsi32_si128(tmp);
}
static void store3(void* p, __m128i v) {
- /* We'll pull from SSE as a 32-bit int, then write
- * its bottom two bytes, then its third byte.
- */
- png_uint_32 v012;
- store4(&v012, v);
-
- png_uint_16* p01 = p;
- png_byte* p2 = (png_byte*)(p01+1);
- *p01 = v012;
- *p2 = v012 >> 16;
+ int tmp = _mm_cvtsi128_si32(v);
+ memcpy(p, &tmp, 3);
}
void png_read_filter_row_sub3_sse2(png_row_infop row_info, png_bytep row,
@@ -69,10 +56,13 @@
* There is no pixel to the left of the first pixel. It's encoded directly.
* That works with our main loop if we just say that left pixel was zero.
*/
- png_debug(1, "in png_read_filter_row_sub3_sse2");
+ size_t rb;
+
__m128i a, d = _mm_setzero_si128();
- int rb = row_info->rowbytes;
+ png_debug(1, "in png_read_filter_row_sub3_sse2");
+
+ rb = row_info->rowbytes;
while (rb >= 4) {
a = d; d = load4(row);
d = _mm_add_epi8(d, a);
@@ -89,6 +79,7 @@
row += 3;
rb -= 3;
}
+ PNG_UNUSED(prev)
}
void png_read_filter_row_sub4_sse2(png_row_infop row_info, png_bytep row,
@@ -98,11 +89,14 @@
* There is no pixel to the left of the first pixel. It's encoded directly.
* That works with our main loop if we just say that left pixel was zero.
*/
- png_debug(1, "in png_read_filter_row_sub4_sse2");
+ size_t rb;
+
__m128i a, d = _mm_setzero_si128();
- int rb = row_info->rowbytes;
- while (rb > 0) {
+ png_debug(1, "in png_read_filter_row_sub4_sse2");
+
+ rb = row_info->rowbytes+4;
+ while (rb > 4) {
a = d; d = load4(row);
d = _mm_add_epi8(d, a);
store4(row, d);
@@ -110,6 +104,7 @@
row += 4;
rb -= 4;
}
+ PNG_UNUSED(prev)
}
void png_read_filter_row_avg3_sse2(png_row_infop row_info, png_bytep row,
@@ -120,18 +115,23 @@
* predicted to be half of the pixel above it. So again, this works
* perfectly with our loop if we make sure a starts at zero.
*/
- png_debug(1, "in png_read_filter_row_avg3_sse2");
+
+ size_t rb;
+
const __m128i zero = _mm_setzero_si128();
+
__m128i b;
__m128i a, d = zero;
- int rb = row_info->rowbytes;
+ png_debug(1, "in png_read_filter_row_avg3_sse2");
+ rb = row_info->rowbytes;
while (rb >= 4) {
+ __m128i avg;
b = load4(prev);
a = d; d = load4(row );
/* PNG requires a truncating average, so we can't just use _mm_avg_epu8 */
- __m128i avg = _mm_avg_epu8(a,b);
+ avg = _mm_avg_epu8(a,b);
/* ...but we can fix it up by subtracting off 1 if it rounded up. */
avg = _mm_sub_epi8(avg, _mm_and_si128(_mm_xor_si128(a,b),
_mm_set1_epi8(1)));
@@ -143,11 +143,12 @@
rb -= 3;
}
if (rb > 0) {
+ __m128i avg;
b = load3(prev);
a = d; d = load3(row );
/* PNG requires a truncating average, so we can't just use _mm_avg_epu8 */
- __m128i avg = _mm_avg_epu8(a,b);
+ avg = _mm_avg_epu8(a,b);
/* ...but we can fix it up by subtracting off 1 if it rounded up. */
avg = _mm_sub_epi8(avg, _mm_and_si128(_mm_xor_si128(a,b),
_mm_set1_epi8(1)));
@@ -169,18 +170,21 @@
* predicted to be half of the pixel above it. So again, this works
* perfectly with our loop if we make sure a starts at zero.
*/
- png_debug(1, "in png_read_filter_row_avg4_sse2");
+ size_t rb;
const __m128i zero = _mm_setzero_si128();
__m128i b;
__m128i a, d = zero;
- int rb = row_info->rowbytes;
- while (rb > 0) {
+ png_debug(1, "in png_read_filter_row_avg4_sse2");
+
+ rb = row_info->rowbytes+4;
+ while (rb > 4) {
+ __m128i avg;
b = load4(prev);
a = d; d = load4(row );
/* PNG requires a truncating average, so we can't just use _mm_avg_epu8 */
- __m128i avg = _mm_avg_epu8(a,b);
+ avg = _mm_avg_epu8(a,b);
/* ...but we can fix it up by subtracting off 1 if it rounded up. */
avg = _mm_sub_epi8(avg, _mm_and_si128(_mm_xor_si128(a,b),
_mm_set1_epi8(1)));
@@ -238,38 +242,42 @@
* Here we zero b and d, which become c and a respectively at the start of
* the loop.
*/
- png_debug(1, "in png_read_filter_row_paeth3_sse2");
+ size_t rb;
const __m128i zero = _mm_setzero_si128();
__m128i c, b = zero,
a, d = zero;
- int rb = row_info->rowbytes;
+ png_debug(1, "in png_read_filter_row_paeth3_sse2");
+
+ rb = row_info->rowbytes;
while (rb >= 4) {
/* It's easiest to do this math (particularly, deal with pc) with 16-bit
* intermediates.
*/
+ __m128i pa,pb,pc,smallest,nearest;
c = b; b = _mm_unpacklo_epi8(load4(prev), zero);
a = d; d = _mm_unpacklo_epi8(load4(row ), zero);
/* (p-a) == (a+b-c - a) == (b-c) */
- __m128i pa = _mm_sub_epi16(b,c);
+
+ pa = _mm_sub_epi16(b,c);
/* (p-b) == (a+b-c - b) == (a-c) */
- __m128i pb = _mm_sub_epi16(a,c);
+ pb = _mm_sub_epi16(a,c);
/* (p-c) == (a+b-c - c) == (a+b-c-c) == (b-c)+(a-c) */
- __m128i pc = _mm_add_epi16(pa,pb);
+ pc = _mm_add_epi16(pa,pb);
pa = abs_i16(pa); /* |p-a| */
pb = abs_i16(pb); /* |p-b| */
pc = abs_i16(pc); /* |p-c| */
- __m128i smallest = _mm_min_epi16(pc, _mm_min_epi16(pa, pb));
+ smallest = _mm_min_epi16(pc, _mm_min_epi16(pa, pb));
/* Paeth breaks ties favoring a over b over c. */
- __m128i nearest = if_then_else(_mm_cmpeq_epi16(smallest, pa), a,
- if_then_else(_mm_cmpeq_epi16(smallest, pb), b,
- c));
+ nearest = if_then_else(_mm_cmpeq_epi16(smallest, pa), a,
+ if_then_else(_mm_cmpeq_epi16(smallest, pb), b,
+ c));
/* Note `_epi8`: we need addition to wrap modulo 255. */
d = _mm_add_epi8(d, nearest);
@@ -283,26 +291,27 @@
/* It's easiest to do this math (particularly, deal with pc) with 16-bit
* intermediates.
*/
+ __m128i pa,pb,pc,smallest,nearest;
c = b; b = _mm_unpacklo_epi8(load3(prev), zero);
a = d; d = _mm_unpacklo_epi8(load3(row ), zero);
/* (p-a) == (a+b-c - a) == (b-c) */
- __m128i pa = _mm_sub_epi16(b,c);
+ pa = _mm_sub_epi16(b,c);
/* (p-b) == (a+b-c - b) == (a-c) */
- __m128i pb = _mm_sub_epi16(a,c);
+ pb = _mm_sub_epi16(a,c);
/* (p-c) == (a+b-c - c) == (a+b-c-c) == (b-c)+(a-c) */
- __m128i pc = _mm_add_epi16(pa,pb);
+ pc = _mm_add_epi16(pa,pb);
pa = abs_i16(pa); /* |p-a| */
pb = abs_i16(pb); /* |p-b| */
pc = abs_i16(pc); /* |p-c| */
- __m128i smallest = _mm_min_epi16(pc, _mm_min_epi16(pa, pb));
+ smallest = _mm_min_epi16(pc, _mm_min_epi16(pa, pb));
/* Paeth breaks ties favoring a over b over c. */
- __m128i nearest = if_then_else(_mm_cmpeq_epi16(smallest, pa), a,
+ nearest = if_then_else(_mm_cmpeq_epi16(smallest, pa), a,
if_then_else(_mm_cmpeq_epi16(smallest, pb), b,
c));
@@ -332,13 +341,16 @@
* Here we zero b and d, which become c and a respectively at the start of
* the loop.
*/
- png_debug(1, "in png_read_filter_row_paeth4_sse2");
+ size_t rb;
const __m128i zero = _mm_setzero_si128();
+ __m128i pa,pb,pc,smallest,nearest;
__m128i c, b = zero,
a, d = zero;
- int rb = row_info->rowbytes;
- while (rb > 0) {
+ png_debug(1, "in png_read_filter_row_paeth4_sse2");
+
+ rb = row_info->rowbytes+4;
+ while (rb > 4) {
/* It's easiest to do this math (particularly, deal with pc) with 16-bit
* intermediates.
*/
@@ -346,22 +358,22 @@
a = d; d = _mm_unpacklo_epi8(load4(row ), zero);
/* (p-a) == (a+b-c - a) == (b-c) */
- __m128i pa = _mm_sub_epi16(b,c);
+ pa = _mm_sub_epi16(b,c);
/* (p-b) == (a+b-c - b) == (a-c) */
- __m128i pb = _mm_sub_epi16(a,c);
+ pb = _mm_sub_epi16(a,c);
/* (p-c) == (a+b-c - c) == (a+b-c-c) == (b-c)+(a-c) */
- __m128i pc = _mm_add_epi16(pa,pb);
+ pc = _mm_add_epi16(pa,pb);
pa = abs_i16(pa); /* |p-a| */
pb = abs_i16(pb); /* |p-b| */
pc = abs_i16(pc); /* |p-c| */
- __m128i smallest = _mm_min_epi16(pc, _mm_min_epi16(pa, pb));
+ smallest = _mm_min_epi16(pc, _mm_min_epi16(pa, pb));
/* Paeth breaks ties favoring a over b over c. */
- __m128i nearest = if_then_else(_mm_cmpeq_epi16(smallest, pa), a,
+ nearest = if_then_else(_mm_cmpeq_epi16(smallest, pa), a,
if_then_else(_mm_cmpeq_epi16(smallest, pb), b,
c));
diff --git a/contrib/intel/intel_init.c b/intel/intel_init.c
similarity index 86%
rename from contrib/intel/intel_init.c
rename to intel/intel_init.c
index 328e90e..2f8168b 100644
--- a/contrib/intel/intel_init.c
+++ b/intel/intel_init.c
@@ -1,19 +1,17 @@
/* intel_init.c - SSE2 optimized filter functions
*
- * Copyright (c) 2016 Google, Inc.
- * Written by Mike Klein and Matt Sarett
- * Derived from arm/arm_init.c, which was
- * Copyright (c) 2014,2016 Glenn Randers-Pehrson
- *
- * Last changed in libpng 1.6.22 [May 26, 2016]
+ * Copyright (c) 2018 Cosmin Truta
+ * Copyright (c) 2016-2017 Glenn Randers-Pehrson
+ * Written by Mike Klein and Matt Sarett, Google, Inc.
+ * Derived from arm/arm_init.c
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
* and license in png.h
*/
-#include "../../pngpriv.h"
+#include "../pngpriv.h"
#ifdef PNG_READ_SUPPORTED
#if PNG_INTEL_SSE_IMPLEMENTATION > 0
diff --git a/mips/filter_msa_intrinsics.c b/mips/filter_msa_intrinsics.c
new file mode 100644
index 0000000..a579179
--- /dev/null
+++ b/mips/filter_msa_intrinsics.c
@@ -0,0 +1,808 @@
+
+/* filter_msa_intrinsics.c - MSA optimised filter functions
+ *
+ * Copyright (c) 2018 Cosmin Truta
+ * Copyright (c) 2016 Glenn Randers-Pehrson
+ * Written by Mandar Sahastrabuddhe, August 2016.
+ *
+ * This code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
+ */
+
+#include <stdio.h>
+#include <stdint.h>
+#include "../pngpriv.h"
+
+#ifdef PNG_READ_SUPPORTED
+
+/* This code requires -mfpu=msa on the command line: */
+#if PNG_MIPS_MSA_IMPLEMENTATION == 1 /* intrinsics code from pngpriv.h */
+
+#include <msa.h>
+
+/* libpng row pointers are not necessarily aligned to any particular boundary,
+ * however this code will only work with appropriate alignment. mips/mips_init.c
+ * checks for this (and will not compile unless it is done). This code uses
+ * variants of png_aligncast to avoid compiler warnings.
+ */
+#define png_ptr(type,pointer) png_aligncast(type *,pointer)
+#define png_ptrc(type,pointer) png_aligncastconst(const type *,pointer)
+
+/* The following relies on a variable 'temp_pointer' being declared with type
+ * 'type'. This is written this way just to hide the GCC strict aliasing
+ * warning; note that the code is safe because there never is an alias between
+ * the input and output pointers.
+ */
+#define png_ldr(type,pointer)\
+ (temp_pointer = png_ptr(type,pointer), *temp_pointer)
+
+#if PNG_MIPS_MSA_OPT > 0
+
+#ifdef CLANG_BUILD
+ #define MSA_SRLI_B(a, b) __msa_srli_b((v16i8) a, b)
+
+ #define LW(psrc) \
+ ( { \
+ uint8_t *psrc_lw_m = (uint8_t *) (psrc); \
+ uint32_t val_m; \
+ \
+ asm volatile ( \
+ "lw %[val_m], %[psrc_lw_m] \n\t" \
+ \
+ : [val_m] "=r" (val_m) \
+ : [psrc_lw_m] "m" (*psrc_lw_m) \
+ ); \
+ \
+ val_m; \
+ } )
+
+ #define SH(val, pdst) \
+ { \
+ uint8_t *pdst_sh_m = (uint8_t *) (pdst); \
+ uint16_t val_m = (val); \
+ \
+ asm volatile ( \
+ "sh %[val_m], %[pdst_sh_m] \n\t" \
+ \
+ : [pdst_sh_m] "=m" (*pdst_sh_m) \
+ : [val_m] "r" (val_m) \
+ ); \
+ }
+
+ #define SW(val, pdst) \
+ { \
+ uint8_t *pdst_sw_m = (uint8_t *) (pdst); \
+ uint32_t val_m = (val); \
+ \
+ asm volatile ( \
+ "sw %[val_m], %[pdst_sw_m] \n\t" \
+ \
+ : [pdst_sw_m] "=m" (*pdst_sw_m) \
+ : [val_m] "r" (val_m) \
+ ); \
+ }
+
+ #if (__mips == 64)
+ #define SD(val, pdst) \
+ { \
+ uint8_t *pdst_sd_m = (uint8_t *) (pdst); \
+ uint64_t val_m = (val); \
+ \
+ asm volatile ( \
+ "sd %[val_m], %[pdst_sd_m] \n\t" \
+ \
+ : [pdst_sd_m] "=m" (*pdst_sd_m) \
+ : [val_m] "r" (val_m) \
+ ); \
+ }
+ #else
+ #define SD(val, pdst) \
+ { \
+ uint8_t *pdst_sd_m = (uint8_t *) (pdst); \
+ uint32_t val0_m, val1_m; \
+ \
+ val0_m = (uint32_t) ((val) & 0x00000000FFFFFFFF); \
+ val1_m = (uint32_t) (((val) >> 32) & 0x00000000FFFFFFFF); \
+ \
+ SW(val0_m, pdst_sd_m); \
+ SW(val1_m, pdst_sd_m + 4); \
+ }
+ #endif
+#else
+ #define MSA_SRLI_B(a, b) (a >> b)
+
+#if (__mips_isa_rev >= 6)
+ #define LW(psrc) \
+ ( { \
+ uint8_t *psrc_lw_m = (uint8_t *) (psrc); \
+ uint32_t val_m; \
+ \
+ asm volatile ( \
+ "lw %[val_m], %[psrc_lw_m] \n\t" \
+ \
+ : [val_m] "=r" (val_m) \
+ : [psrc_lw_m] "m" (*psrc_lw_m) \
+ ); \
+ \
+ val_m; \
+ } )
+
+ #define SH(val, pdst) \
+ { \
+ uint8_t *pdst_sh_m = (uint8_t *) (pdst); \
+ uint16_t val_m = (val); \
+ \
+ asm volatile ( \
+ "sh %[val_m], %[pdst_sh_m] \n\t" \
+ \
+ : [pdst_sh_m] "=m" (*pdst_sh_m) \
+ : [val_m] "r" (val_m) \
+ ); \
+ }
+
+ #define SW(val, pdst) \
+ { \
+ uint8_t *pdst_sw_m = (uint8_t *) (pdst); \
+ uint32_t val_m = (val); \
+ \
+ asm volatile ( \
+ "sw %[val_m], %[pdst_sw_m] \n\t" \
+ \
+ : [pdst_sw_m] "=m" (*pdst_sw_m) \
+ : [val_m] "r" (val_m) \
+ ); \
+ }
+
+ #if (__mips == 64)
+ #define SD(val, pdst) \
+ { \
+ uint8_t *pdst_sd_m = (uint8_t *) (pdst); \
+ uint64_t val_m = (val); \
+ \
+ asm volatile ( \
+ "sd %[val_m], %[pdst_sd_m] \n\t" \
+ \
+ : [pdst_sd_m] "=m" (*pdst_sd_m) \
+ : [val_m] "r" (val_m) \
+ ); \
+ }
+ #else
+ #define SD(val, pdst) \
+ { \
+ uint8_t *pdst_sd_m = (uint8_t *) (pdst); \
+ uint32_t val0_m, val1_m; \
+ \
+ val0_m = (uint32_t) ((val) & 0x00000000FFFFFFFF); \
+ val1_m = (uint32_t) (((val) >> 32) & 0x00000000FFFFFFFF); \
+ \
+ SW(val0_m, pdst_sd_m); \
+ SW(val1_m, pdst_sd_m + 4); \
+ }
+ #endif
+#else // !(__mips_isa_rev >= 6)
+ #define LW(psrc) \
+ ( { \
+ uint8_t *psrc_lw_m = (uint8_t *) (psrc); \
+ uint32_t val_m; \
+ \
+ asm volatile ( \
+ "ulw %[val_m], %[psrc_lw_m] \n\t" \
+ \
+ : [val_m] "=r" (val_m) \
+ : [psrc_lw_m] "m" (*psrc_lw_m) \
+ ); \
+ \
+ val_m; \
+ } )
+
+ #define SH(val, pdst) \
+ { \
+ uint8_t *pdst_sh_m = (uint8_t *) (pdst); \
+ uint16_t val_m = (val); \
+ \
+ asm volatile ( \
+ "ush %[val_m], %[pdst_sh_m] \n\t" \
+ \
+ : [pdst_sh_m] "=m" (*pdst_sh_m) \
+ : [val_m] "r" (val_m) \
+ ); \
+ }
+
+ #define SW(val, pdst) \
+ { \
+ uint8_t *pdst_sw_m = (uint8_t *) (pdst); \
+ uint32_t val_m = (val); \
+ \
+ asm volatile ( \
+ "usw %[val_m], %[pdst_sw_m] \n\t" \
+ \
+ : [pdst_sw_m] "=m" (*pdst_sw_m) \
+ : [val_m] "r" (val_m) \
+ ); \
+ }
+
+ #define SD(val, pdst) \
+ { \
+ uint8_t *pdst_sd_m = (uint8_t *) (pdst); \
+ uint32_t val0_m, val1_m; \
+ \
+ val0_m = (uint32_t) ((val) & 0x00000000FFFFFFFF); \
+ val1_m = (uint32_t) (((val) >> 32) & 0x00000000FFFFFFFF); \
+ \
+ SW(val0_m, pdst_sd_m); \
+ SW(val1_m, pdst_sd_m + 4); \
+ }
+
+ #define SW_ZERO(pdst) \
+ { \
+ uint8_t *pdst_m = (uint8_t *) (pdst); \
+ \
+ asm volatile ( \
+ "usw $0, %[pdst_m] \n\t" \
+ \
+ : [pdst_m] "=m" (*pdst_m) \
+ : \
+ ); \
+ }
+#endif // (__mips_isa_rev >= 6)
+#endif
+
+#define LD_B(RTYPE, psrc) *((RTYPE *) (psrc))
+#define LD_UB(...) LD_B(v16u8, __VA_ARGS__)
+#define LD_B2(RTYPE, psrc, stride, out0, out1) \
+{ \
+ out0 = LD_B(RTYPE, (psrc)); \
+ out1 = LD_B(RTYPE, (psrc) + stride); \
+}
+#define LD_UB2(...) LD_B2(v16u8, __VA_ARGS__)
+#define LD_B4(RTYPE, psrc, stride, out0, out1, out2, out3) \
+{ \
+ LD_B2(RTYPE, (psrc), stride, out0, out1); \
+ LD_B2(RTYPE, (psrc) + 2 * stride , stride, out2, out3); \
+}
+#define LD_UB4(...) LD_B4(v16u8, __VA_ARGS__)
+
+#define ST_B(RTYPE, in, pdst) *((RTYPE *) (pdst)) = (in)
+#define ST_UB(...) ST_B(v16u8, __VA_ARGS__)
+#define ST_B2(RTYPE, in0, in1, pdst, stride) \
+{ \
+ ST_B(RTYPE, in0, (pdst)); \
+ ST_B(RTYPE, in1, (pdst) + stride); \
+}
+#define ST_UB2(...) ST_B2(v16u8, __VA_ARGS__)
+#define ST_B4(RTYPE, in0, in1, in2, in3, pdst, stride) \
+{ \
+ ST_B2(RTYPE, in0, in1, (pdst), stride); \
+ ST_B2(RTYPE, in2, in3, (pdst) + 2 * stride, stride); \
+}
+#define ST_UB4(...) ST_B4(v16u8, __VA_ARGS__)
+
+#define ADD2(in0, in1, in2, in3, out0, out1) \
+{ \
+ out0 = in0 + in1; \
+ out1 = in2 + in3; \
+}
+#define ADD3(in0, in1, in2, in3, in4, in5, \
+ out0, out1, out2) \
+{ \
+ ADD2(in0, in1, in2, in3, out0, out1); \
+ out2 = in4 + in5; \
+}
+#define ADD4(in0, in1, in2, in3, in4, in5, in6, in7, \
+ out0, out1, out2, out3) \
+{ \
+ ADD2(in0, in1, in2, in3, out0, out1); \
+ ADD2(in4, in5, in6, in7, out2, out3); \
+}
+
+#define ILVR_B2(RTYPE, in0, in1, in2, in3, out0, out1) \
+{ \
+ out0 = (RTYPE) __msa_ilvr_b((v16i8) in0, (v16i8) in1); \
+ out1 = (RTYPE) __msa_ilvr_b((v16i8) in2, (v16i8) in3); \
+}
+#define ILVR_B2_SH(...) ILVR_B2(v8i16, __VA_ARGS__)
+
+#define HSUB_UB2(RTYPE, in0, in1, out0, out1) \
+{ \
+ out0 = (RTYPE) __msa_hsub_u_h((v16u8) in0, (v16u8) in0); \
+ out1 = (RTYPE) __msa_hsub_u_h((v16u8) in1, (v16u8) in1); \
+}
+#define HSUB_UB2_SH(...) HSUB_UB2(v8i16, __VA_ARGS__)
+
+#define SLDI_B2_0(RTYPE, in0, in1, out0, out1, slide_val) \
+{ \
+ v16i8 zero_m = { 0 }; \
+ out0 = (RTYPE) __msa_sldi_b((v16i8) zero_m, (v16i8) in0, slide_val); \
+ out1 = (RTYPE) __msa_sldi_b((v16i8) zero_m, (v16i8) in1, slide_val); \
+}
+#define SLDI_B2_0_UB(...) SLDI_B2_0(v16u8, __VA_ARGS__)
+
+#define SLDI_B3_0(RTYPE, in0, in1, in2, out0, out1, out2, slide_val) \
+{ \
+ v16i8 zero_m = { 0 }; \
+ SLDI_B2_0(RTYPE, in0, in1, out0, out1, slide_val); \
+ out2 = (RTYPE) __msa_sldi_b((v16i8) zero_m, (v16i8) in2, slide_val); \
+}
+#define SLDI_B3_0_UB(...) SLDI_B3_0(v16u8, __VA_ARGS__)
+
+#define ILVEV_W2(RTYPE, in0, in1, in2, in3, out0, out1) \
+{ \
+ out0 = (RTYPE) __msa_ilvev_w((v4i32) in1, (v4i32) in0); \
+ out1 = (RTYPE) __msa_ilvev_w((v4i32) in3, (v4i32) in2); \
+}
+#define ILVEV_W2_UB(...) ILVEV_W2(v16u8, __VA_ARGS__)
+
+#define ADD_ABS_H3(RTYPE, in0, in1, in2, out0, out1, out2) \
+{ \
+ RTYPE zero = {0}; \
+ \
+ out0 = __msa_add_a_h((v8i16) zero, in0); \
+ out1 = __msa_add_a_h((v8i16) zero, in1); \
+ out2 = __msa_add_a_h((v8i16) zero, in2); \
+}
+#define ADD_ABS_H3_SH(...) ADD_ABS_H3(v8i16, __VA_ARGS__)
+
+#define VSHF_B2(RTYPE, in0, in1, in2, in3, mask0, mask1, out0, out1) \
+{ \
+ out0 = (RTYPE) __msa_vshf_b((v16i8) mask0, (v16i8) in1, (v16i8) in0); \
+ out1 = (RTYPE) __msa_vshf_b((v16i8) mask1, (v16i8) in3, (v16i8) in2); \
+}
+#define VSHF_B2_UB(...) VSHF_B2(v16u8, __VA_ARGS__)
+
+#define CMP_AND_SELECT(inp0, inp1, inp2, inp3, inp4, inp5, out0) \
+{ \
+ v8i16 _sel_h0, _sel_h1; \
+ v16u8 _sel_b0, _sel_b1; \
+ _sel_h0 = (v8i16) __msa_clt_u_h((v8u16) inp1, (v8u16) inp0); \
+ _sel_b0 = (v16u8) __msa_pckev_b((v16i8) _sel_h0, (v16i8) _sel_h0); \
+ inp0 = (v8i16) __msa_bmnz_v((v16u8) inp0, (v16u8) inp1, (v16u8) _sel_h0); \
+ inp4 = (v16u8) __msa_bmnz_v(inp3, inp4, _sel_b0); \
+ _sel_h1 = (v8i16) __msa_clt_u_h((v8u16) inp2, (v8u16) inp0); \
+ _sel_b1 = (v16u8) __msa_pckev_b((v16i8) _sel_h1, (v16i8) _sel_h1); \
+ inp4 = (v16u8) __msa_bmnz_v(inp4, inp5, _sel_b1); \
+ out0 += inp4; \
+}
+
+void png_read_filter_row_up_msa(png_row_infop row_info, png_bytep row,
+ png_const_bytep prev_row)
+{
+ size_t i, cnt, cnt16, cnt32;
+ size_t istop = row_info->rowbytes;
+ png_bytep rp = row;
+ png_const_bytep pp = prev_row;
+ v16u8 src0, src1, src2, src3, src4, src5, src6, src7;
+
+ for (i = 0; i < (istop >> 6); i++)
+ {
+ LD_UB4(rp, 16, src0, src1, src2, src3);
+ LD_UB4(pp, 16, src4, src5, src6, src7);
+ pp += 64;
+
+ ADD4(src0, src4, src1, src5, src2, src6, src3, src7,
+ src0, src1, src2, src3);
+
+ ST_UB4(src0, src1, src2, src3, rp, 16);
+ rp += 64;
+ }
+
+ if (istop & 0x3F)
+ {
+ cnt32 = istop & 0x20;
+ cnt16 = istop & 0x10;
+ cnt = istop & 0xF;
+
+ if(cnt32)
+ {
+ if (cnt16 && cnt)
+ {
+ LD_UB4(rp, 16, src0, src1, src2, src3);
+ LD_UB4(pp, 16, src4, src5, src6, src7);
+
+ ADD4(src0, src4, src1, src5, src2, src6, src3, src7,
+ src0, src1, src2, src3);
+
+ ST_UB4(src0, src1, src2, src3, rp, 16);
+ rp += 64;
+ }
+ else if (cnt16 || cnt)
+ {
+ LD_UB2(rp, 16, src0, src1);
+ LD_UB2(pp, 16, src4, src5);
+ pp += 32;
+ src2 = LD_UB(rp + 32);
+ src6 = LD_UB(pp);
+
+ ADD3(src0, src4, src1, src5, src2, src6, src0, src1, src2);
+
+ ST_UB2(src0, src1, rp, 16);
+ rp += 32;
+ ST_UB(src2, rp);
+ rp += 16;
+ }
+ else
+ {
+ LD_UB2(rp, 16, src0, src1);
+ LD_UB2(pp, 16, src4, src5);
+
+ ADD2(src0, src4, src1, src5, src0, src1);
+
+ ST_UB2(src0, src1, rp, 16);
+ rp += 32;
+ }
+ }
+ else if (cnt16 && cnt)
+ {
+ LD_UB2(rp, 16, src0, src1);
+ LD_UB2(pp, 16, src4, src5);
+
+ ADD2(src0, src4, src1, src5, src0, src1);
+
+ ST_UB2(src0, src1, rp, 16);
+ rp += 32;
+ }
+ else if (cnt16 || cnt)
+ {
+ src0 = LD_UB(rp);
+ src4 = LD_UB(pp);
+ pp += 16;
+
+ src0 += src4;
+
+ ST_UB(src0, rp);
+ rp += 16;
+ }
+ }
+}
+
+void png_read_filter_row_sub4_msa(png_row_infop row_info, png_bytep row,
+ png_const_bytep prev_row)
+{
+ size_t count;
+ size_t istop = row_info->rowbytes;
+ png_bytep src = row;
+ png_bytep nxt = row + 4;
+ int32_t inp0;
+ v16u8 src0, src1, src2, src3, src4;
+ v16u8 dst0, dst1;
+ v16u8 zero = { 0 };
+
+ istop -= 4;
+
+ inp0 = LW(src);
+ src += 4;
+ src0 = (v16u8) __msa_insert_w((v4i32) zero, 0, inp0);
+
+ for (count = 0; count < istop; count += 16)
+ {
+ src1 = LD_UB(src);
+ src += 16;
+
+ src2 = (v16u8) __msa_sldi_b((v16i8) zero, (v16i8) src1, 4);
+ src3 = (v16u8) __msa_sldi_b((v16i8) zero, (v16i8) src1, 8);
+ src4 = (v16u8) __msa_sldi_b((v16i8) zero, (v16i8) src1, 12);
+ src1 += src0;
+ src2 += src1;
+ src3 += src2;
+ src4 += src3;
+ src0 = src4;
+ ILVEV_W2_UB(src1, src2, src3, src4, dst0, dst1);
+ dst0 = (v16u8) __msa_pckev_d((v2i64) dst1, (v2i64) dst0);
+
+ ST_UB(dst0, nxt);
+ nxt += 16;
+ }
+}
+
+void png_read_filter_row_sub3_msa(png_row_infop row_info, png_bytep row,
+ png_const_bytep prev_row)
+{
+ size_t count;
+ size_t istop = row_info->rowbytes;
+ png_bytep src = row;
+ png_bytep nxt = row + 3;
+ int64_t out0;
+ int32_t inp0, out1;
+ v16u8 src0, src1, src2, src3, src4, dst0, dst1;
+ v16u8 zero = { 0 };
+ v16i8 mask0 = { 0, 1, 2, 16, 17, 18, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
+ v16i8 mask1 = { 0, 1, 2, 3, 4, 5, 16, 17, 18, 19, 20, 21, 0, 0, 0, 0 };
+
+ istop -= 3;
+
+ inp0 = LW(src);
+ src += 3;
+ src0 = (v16u8) __msa_insert_w((v4i32) zero, 0, inp0);
+
+ for (count = 0; count < istop; count += 12)
+ {
+ src1 = LD_UB(src);
+ src += 12;
+
+ src2 = (v16u8) __msa_sldi_b((v16i8) zero, (v16i8) src1, 3);
+ src3 = (v16u8) __msa_sldi_b((v16i8) zero, (v16i8) src1, 6);
+ src4 = (v16u8) __msa_sldi_b((v16i8) zero, (v16i8) src1, 9);
+ src1 += src0;
+ src2 += src1;
+ src3 += src2;
+ src4 += src3;
+ src0 = src4;
+ VSHF_B2_UB(src1, src2, src3, src4, mask0, mask0, dst0, dst1);
+ dst0 = (v16u8) __msa_vshf_b(mask1, (v16i8) dst1, (v16i8) dst0);
+ out0 = __msa_copy_s_d((v2i64) dst0, 0);
+ out1 = __msa_copy_s_w((v4i32) dst0, 2);
+
+ SD(out0, nxt);
+ nxt += 8;
+ SW(out1, nxt);
+ nxt += 4;
+ }
+}
+
+void png_read_filter_row_avg4_msa(png_row_infop row_info, png_bytep row,
+ png_const_bytep prev_row)
+{
+ size_t i;
+ png_bytep src = row;
+ png_bytep nxt = row;
+ png_const_bytep pp = prev_row;
+ size_t istop = row_info->rowbytes - 4;
+ int32_t inp0, inp1, out0;
+ v16u8 src0, src1, src2, src3, src4, src5, src6, src7, src8, src9, dst0, dst1;
+ v16u8 zero = { 0 };
+
+ inp0 = LW(pp);
+ pp += 4;
+ inp1 = LW(src);
+ src += 4;
+ src0 = (v16u8) __msa_insert_w((v4i32) zero, 0, inp0);
+ src1 = (v16u8) __msa_insert_w((v4i32) zero, 0, inp1);
+ src0 = (v16u8) MSA_SRLI_B(src0, 1);
+ src1 += src0;
+ out0 = __msa_copy_s_w((v4i32) src1, 0);
+ SW(out0, nxt);
+ nxt += 4;
+
+ for (i = 0; i < istop; i += 16)
+ {
+ src2 = LD_UB(pp);
+ pp += 16;
+ src6 = LD_UB(src);
+ src += 16;
+
+ SLDI_B2_0_UB(src2, src6, src3, src7, 4);
+ SLDI_B2_0_UB(src2, src6, src4, src8, 8);
+ SLDI_B2_0_UB(src2, src6, src5, src9, 12);
+ src2 = __msa_ave_u_b(src2, src1);
+ src6 += src2;
+ src3 = __msa_ave_u_b(src3, src6);
+ src7 += src3;
+ src4 = __msa_ave_u_b(src4, src7);
+ src8 += src4;
+ src5 = __msa_ave_u_b(src5, src8);
+ src9 += src5;
+ src1 = src9;
+ ILVEV_W2_UB(src6, src7, src8, src9, dst0, dst1);
+ dst0 = (v16u8) __msa_pckev_d((v2i64) dst1, (v2i64) dst0);
+
+ ST_UB(dst0, nxt);
+ nxt += 16;
+ }
+}
+
+void png_read_filter_row_avg3_msa(png_row_infop row_info, png_bytep row,
+ png_const_bytep prev_row)
+{
+ size_t i;
+ png_bytep src = row;
+ png_bytep nxt = row;
+ png_const_bytep pp = prev_row;
+ size_t istop = row_info->rowbytes - 3;
+ int64_t out0;
+ int32_t inp0, inp1, out1;
+ int16_t out2;
+ v16u8 src0, src1, src2, src3, src4, src5, src6, src7, src8, src9, dst0, dst1;
+ v16u8 zero = { 0 };
+ v16i8 mask0 = { 0, 1, 2, 16, 17, 18, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
+ v16i8 mask1 = { 0, 1, 2, 3, 4, 5, 16, 17, 18, 19, 20, 21, 0, 0, 0, 0 };
+
+ inp0 = LW(pp);
+ pp += 3;
+ inp1 = LW(src);
+ src += 3;
+ src0 = (v16u8) __msa_insert_w((v4i32) zero, 0, inp0);
+ src1 = (v16u8) __msa_insert_w((v4i32) zero, 0, inp1);
+ src0 = (v16u8) MSA_SRLI_B(src0, 1);
+ src1 += src0;
+ out2 = __msa_copy_s_h((v8i16) src1, 0);
+ SH(out2, nxt);
+ nxt += 2;
+ nxt[0] = src1[2];
+ nxt++;
+
+ for (i = 0; i < istop; i += 12)
+ {
+ src2 = LD_UB(pp);
+ pp += 12;
+ src6 = LD_UB(src);
+ src += 12;
+
+ SLDI_B2_0_UB(src2, src6, src3, src7, 3);
+ SLDI_B2_0_UB(src2, src6, src4, src8, 6);
+ SLDI_B2_0_UB(src2, src6, src5, src9, 9);
+ src2 = __msa_ave_u_b(src2, src1);
+ src6 += src2;
+ src3 = __msa_ave_u_b(src3, src6);
+ src7 += src3;
+ src4 = __msa_ave_u_b(src4, src7);
+ src8 += src4;
+ src5 = __msa_ave_u_b(src5, src8);
+ src9 += src5;
+ src1 = src9;
+ VSHF_B2_UB(src6, src7, src8, src9, mask0, mask0, dst0, dst1);
+ dst0 = (v16u8) __msa_vshf_b(mask1, (v16i8) dst1, (v16i8) dst0);
+ out0 = __msa_copy_s_d((v2i64) dst0, 0);
+ out1 = __msa_copy_s_w((v4i32) dst0, 2);
+
+ SD(out0, nxt);
+ nxt += 8;
+ SW(out1, nxt);
+ nxt += 4;
+ }
+}
+
+void png_read_filter_row_paeth4_msa(png_row_infop row_info,
+ png_bytep row,
+ png_const_bytep prev_row)
+{
+ int32_t count, rp_end;
+ png_bytep nxt;
+ png_const_bytep prev_nxt;
+ int32_t inp0, inp1, res0;
+ v16u8 src0, src1, src2, src3, src4, src5, src6, src7, src8, src9;
+ v16u8 src10, src11, src12, src13, dst0, dst1;
+ v8i16 vec0, vec1, vec2;
+ v16u8 zero = { 0 };
+
+ nxt = row;
+ prev_nxt = prev_row;
+
+ inp0 = LW(nxt);
+ inp1 = LW(prev_nxt);
+ prev_nxt += 4;
+ src0 = (v16u8) __msa_insert_w((v4i32) zero, 0, inp0);
+ src1 = (v16u8) __msa_insert_w((v4i32) zero, 0, inp1);
+
+ src1 += src0;
+ res0 = __msa_copy_s_w((v4i32) src1, 0);
+
+ SW(res0, nxt);
+ nxt += 4;
+
+ /* Remainder */
+ rp_end = row_info->rowbytes - 4;
+
+ for (count = 0; count < rp_end; count += 16)
+ {
+ src2 = LD_UB(prev_nxt);
+ prev_nxt += 16;
+ src6 = LD_UB(prev_row);
+ prev_row += 16;
+ src10 = LD_UB(nxt);
+
+ SLDI_B3_0_UB(src2, src6, src10, src3, src7, src11, 4);
+ SLDI_B3_0_UB(src2, src6, src10, src4, src8, src12, 8);
+ SLDI_B3_0_UB(src2, src6, src10, src5, src9, src13, 12);
+ ILVR_B2_SH(src2, src6, src1, src6, vec0, vec1);
+ HSUB_UB2_SH(vec0, vec1, vec0, vec1);
+ vec2 = vec0 + vec1;
+ ADD_ABS_H3_SH(vec0, vec1, vec2, vec0, vec1, vec2);
+ CMP_AND_SELECT(vec0, vec1, vec2, src1, src2, src6, src10);
+ ILVR_B2_SH(src3, src7, src10, src7, vec0, vec1);
+ HSUB_UB2_SH(vec0, vec1, vec0, vec1);
+ vec2 = vec0 + vec1;
+ ADD_ABS_H3_SH(vec0, vec1, vec2, vec0, vec1, vec2);
+ CMP_AND_SELECT(vec0, vec1, vec2, src10, src3, src7, src11);
+ ILVR_B2_SH(src4, src8, src11, src8, vec0, vec1);
+ HSUB_UB2_SH(vec0, vec1, vec0, vec1);
+ vec2 = vec0 + vec1;
+ ADD_ABS_H3_SH(vec0, vec1, vec2, vec0, vec1, vec2);
+ CMP_AND_SELECT(vec0, vec1, vec2, src11, src4, src8, src12);
+ ILVR_B2_SH(src5, src9, src12, src9, vec0, vec1);
+ HSUB_UB2_SH(vec0, vec1, vec0, vec1);
+ vec2 = vec0 + vec1;
+ ADD_ABS_H3_SH(vec0, vec1, vec2, vec0, vec1, vec2);
+ CMP_AND_SELECT(vec0, vec1, vec2, src12, src5, src9, src13);
+ src1 = src13;
+ ILVEV_W2_UB(src10, src11, src12, src1, dst0, dst1);
+ dst0 = (v16u8) __msa_pckev_d((v2i64) dst1, (v2i64) dst0);
+
+ ST_UB(dst0, nxt);
+ nxt += 16;
+ }
+}
+
+void png_read_filter_row_paeth3_msa(png_row_infop row_info,
+ png_bytep row,
+ png_const_bytep prev_row)
+{
+ int32_t count, rp_end;
+ png_bytep nxt;
+ png_const_bytep prev_nxt;
+ int64_t out0;
+ int32_t inp0, inp1, out1;
+ int16_t out2;
+ v16u8 src0, src1, src2, src3, src4, src5, src6, src7, src8, src9, dst0, dst1;
+ v16u8 src10, src11, src12, src13;
+ v8i16 vec0, vec1, vec2;
+ v16u8 zero = { 0 };
+ v16i8 mask0 = { 0, 1, 2, 16, 17, 18, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
+ v16i8 mask1 = { 0, 1, 2, 3, 4, 5, 16, 17, 18, 19, 20, 21, 0, 0, 0, 0 };
+
+ nxt = row;
+ prev_nxt = prev_row;
+
+ inp0 = LW(nxt);
+ inp1 = LW(prev_nxt);
+ prev_nxt += 3;
+ src0 = (v16u8) __msa_insert_w((v4i32) zero, 0, inp0);
+ src1 = (v16u8) __msa_insert_w((v4i32) zero, 0, inp1);
+
+ src1 += src0;
+ out2 = __msa_copy_s_h((v8i16) src1, 0);
+
+ SH(out2, nxt);
+ nxt += 2;
+ nxt[0] = src1[2];
+ nxt++;
+
+ /* Remainder */
+ rp_end = row_info->rowbytes - 3;
+
+ for (count = 0; count < rp_end; count += 12)
+ {
+ src2 = LD_UB(prev_nxt);
+ prev_nxt += 12;
+ src6 = LD_UB(prev_row);
+ prev_row += 12;
+ src10 = LD_UB(nxt);
+
+ SLDI_B3_0_UB(src2, src6, src10, src3, src7, src11, 3);
+ SLDI_B3_0_UB(src2, src6, src10, src4, src8, src12, 6);
+ SLDI_B3_0_UB(src2, src6, src10, src5, src9, src13, 9);
+ ILVR_B2_SH(src2, src6, src1, src6, vec0, vec1);
+ HSUB_UB2_SH(vec0, vec1, vec0, vec1);
+ vec2 = vec0 + vec1;
+ ADD_ABS_H3_SH(vec0, vec1, vec2, vec0, vec1, vec2);
+ CMP_AND_SELECT(vec0, vec1, vec2, src1, src2, src6, src10);
+ ILVR_B2_SH(src3, src7, src10, src7, vec0, vec1);
+ HSUB_UB2_SH(vec0, vec1, vec0, vec1);
+ vec2 = vec0 + vec1;
+ ADD_ABS_H3_SH(vec0, vec1, vec2, vec0, vec1, vec2);
+ CMP_AND_SELECT(vec0, vec1, vec2, src10, src3, src7, src11);
+ ILVR_B2_SH(src4, src8, src11, src8, vec0, vec1);
+ HSUB_UB2_SH(vec0, vec1, vec0, vec1);
+ vec2 = vec0 + vec1;
+ ADD_ABS_H3_SH(vec0, vec1, vec2, vec0, vec1, vec2);
+ CMP_AND_SELECT(vec0, vec1, vec2, src11, src4, src8, src12);
+ ILVR_B2_SH(src5, src9, src12, src9, vec0, vec1);
+ HSUB_UB2_SH(vec0, vec1, vec0, vec1);
+ vec2 = vec0 + vec1;
+ ADD_ABS_H3_SH(vec0, vec1, vec2, vec0, vec1, vec2);
+ CMP_AND_SELECT(vec0, vec1, vec2, src12, src5, src9, src13);
+ src1 = src13;
+ VSHF_B2_UB(src10, src11, src12, src13, mask0, mask0, dst0, dst1);
+ dst0 = (v16u8) __msa_vshf_b(mask1, (v16i8) dst1, (v16i8) dst0);
+ out0 = __msa_copy_s_d((v2i64) dst0, 0);
+ out1 = __msa_copy_s_w((v4i32) dst0, 2);
+
+ SD(out0, nxt);
+ nxt += 8;
+ SW(out1, nxt);
+ nxt += 4;
+ }
+}
+
+#endif /* PNG_MIPS_MSA_OPT > 0 */
+#endif /* PNG_MIPS_MSA_IMPLEMENTATION == 1 (intrinsics) */
+#endif /* READ */
diff --git a/mips/mips_init.c b/mips/mips_init.c
new file mode 100644
index 0000000..8dd283d
--- /dev/null
+++ b/mips/mips_init.c
@@ -0,0 +1,130 @@
+
+/* mips_init.c - MSA optimised filter functions
+ *
+ * Copyright (c) 2018 Cosmin Truta
+ * Copyright (c) 2016 Glenn Randers-Pehrson
+ * Written by Mandar Sahastrabuddhe, 2016.
+ *
+ * This code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
+ */
+
+/* Below, after checking __linux__, various non-C90 POSIX 1003.1 functions are
+ * called.
+ */
+#define _POSIX_SOURCE 1
+
+#include <stdio.h>
+#include "../pngpriv.h"
+
+#ifdef PNG_READ_SUPPORTED
+
+#if PNG_MIPS_MSA_OPT > 0
+#ifdef PNG_MIPS_MSA_CHECK_SUPPORTED /* Do run-time checks */
+/* WARNING: it is strongly recommended that you do not build libpng with
+ * run-time checks for CPU features if at all possible. In the case of the MIPS
+ * MSA instructions there is no processor-specific way of detecting the
+ * presence of the required support, therefore run-time detection is extremely
+ * OS specific.
+ *
+ * You may set the macro PNG_MIPS_MSA_FILE to the file name of file containing
+ * a fragment of C source code which defines the png_have_msa function. There
+ * are a number of implementations in contrib/mips-msa, but the only one that
+ * has partial support is contrib/mips-msa/linux.c - a generic Linux
+ * implementation which reads /proc/cpufino.
+ */
+#ifndef PNG_MIPS_MSA_FILE
+# ifdef __linux__
+# define PNG_MIPS_MSA_FILE "contrib/mips-msa/linux.c"
+# endif
+#endif
+
+#ifdef PNG_MIPS_MSA_FILE
+
+#include <signal.h> /* for sig_atomic_t */
+static int png_have_msa(png_structp png_ptr);
+#include PNG_MIPS_MSA_FILE
+
+#else /* PNG_MIPS_MSA_FILE */
+# error "PNG_MIPS_MSA_FILE undefined: no support for run-time MIPS MSA checks"
+#endif /* PNG_MIPS_MSA_FILE */
+#endif /* PNG_MIPS_MSA_CHECK_SUPPORTED */
+
+#ifndef PNG_ALIGNED_MEMORY_SUPPORTED
+# error "ALIGNED_MEMORY is required; set: -DPNG_ALIGNED_MEMORY_SUPPORTED"
+#endif
+
+void
+png_init_filter_functions_msa(png_structp pp, unsigned int bpp)
+{
+ /* The switch statement is compiled in for MIPS_MSA_API, the call to
+ * png_have_msa is compiled in for MIPS_MSA_CHECK. If both are defined
+ * the check is only performed if the API has not set the MSA option on
+ * or off explicitly. In this case the check controls what happens.
+ */
+
+#ifdef PNG_MIPS_MSA_API_SUPPORTED
+ switch ((pp->options >> PNG_MIPS_MSA) & 3)
+ {
+ case PNG_OPTION_UNSET:
+ /* Allow the run-time check to execute if it has been enabled -
+ * thus both API and CHECK can be turned on. If it isn't supported
+ * this case will fall through to the 'default' below, which just
+ * returns.
+ */
+#endif /* PNG_MIPS_MSA_API_SUPPORTED */
+#ifdef PNG_MIPS_MSA_CHECK_SUPPORTED
+ {
+ static volatile sig_atomic_t no_msa = -1; /* not checked */
+
+ if (no_msa < 0)
+ no_msa = !png_have_msa(pp);
+
+ if (no_msa)
+ return;
+ }
+#ifdef PNG_MIPS_MSA_API_SUPPORTED
+ break;
+#endif
+#endif /* PNG_MIPS_MSA_CHECK_SUPPORTED */
+
+#ifdef PNG_MIPS_MSA_API_SUPPORTED
+ default: /* OFF or INVALID */
+ return;
+
+ case PNG_OPTION_ON:
+ /* Option turned on */
+ break;
+ }
+#endif
+
+ /* IMPORTANT: any new external functions used here must be declared using
+ * PNG_INTERNAL_FUNCTION in ../pngpriv.h. This is required so that the
+ * 'prefix' option to configure works:
+ *
+ * ./configure --with-libpng-prefix=foobar_
+ *
+ * Verify you have got this right by running the above command, doing a build
+ * and examining pngprefix.h; it must contain a #define for every external
+ * function you add. (Notice that this happens automatically for the
+ * initialization function.)
+ */
+ pp->read_filter[PNG_FILTER_VALUE_UP-1] = png_read_filter_row_up_msa;
+
+ if (bpp == 3)
+ {
+ pp->read_filter[PNG_FILTER_VALUE_SUB-1] = png_read_filter_row_sub3_msa;
+ pp->read_filter[PNG_FILTER_VALUE_AVG-1] = png_read_filter_row_avg3_msa;
+ pp->read_filter[PNG_FILTER_VALUE_PAETH-1] = png_read_filter_row_paeth3_msa;
+ }
+
+ else if (bpp == 4)
+ {
+ pp->read_filter[PNG_FILTER_VALUE_SUB-1] = png_read_filter_row_sub4_msa;
+ pp->read_filter[PNG_FILTER_VALUE_AVG-1] = png_read_filter_row_avg4_msa;
+ pp->read_filter[PNG_FILTER_VALUE_PAETH-1] = png_read_filter_row_paeth4_msa;
+ }
+}
+#endif /* PNG_MIPS_MSA_OPT > 0 */
+#endif /* READ */
diff --git a/png.c b/png.c
index 0843ebb..757c755 100644
--- a/png.c
+++ b/png.c
@@ -1,10 +1,10 @@
/* png.c - location for general purpose libpng functions
*
- * Last changed in libpng 1.6.24 [August 4, 2016]
- * Copyright (c) 1998-2002,2004,2006-2015 Glenn Randers-Pehrson
- * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
- * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
+ * Copyright (c) 2018-2019 Cosmin Truta
+ * Copyright (c) 1998-2002,2004,2006-2018 Glenn Randers-Pehrson
+ * Copyright (c) 1996-1997 Andreas Dilger
+ * Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
@@ -14,7 +14,27 @@
#include "pngpriv.h"
/* Generate a compiler error if there is an old png.h in the search path. */
-typedef png_libpng_version_1_6_24 Your_png_h_is_not_version_1_6_24;
+typedef png_libpng_version_1_6_37 Your_png_h_is_not_version_1_6_37;
+
+#ifdef __GNUC__
+/* The version tests may need to be added to, but the problem warning has
+ * consistently been fixed in GCC versions which obtain wide-spread release.
+ * The problem is that many versions of GCC rearrange comparison expressions in
+ * the optimizer in such a way that the results of the comparison will change
+ * if signed integer overflow occurs. Such comparisons are not permitted in
+ * ANSI C90, however GCC isn't clever enough to work out that that do not occur
+ * below in png_ascii_from_fp and png_muldiv, so it produces a warning with
+ * -Wextra. Unfortunately this is highly dependent on the optimizer and the
+ * machine architecture so the warning comes and goes unpredictably and is
+ * impossible to "fix", even were that a good idea.
+ */
+#if __GNUC__ == 7 && __GNUC_MINOR__ == 1
+#define GCC_STRICT_OVERFLOW 1
+#endif /* GNU 7.1.x */
+#endif /* GNU */
+#ifndef GCC_STRICT_OVERFLOW
+#define GCC_STRICT_OVERFLOW 0
+#endif
/* Tells libpng that we have already handled the first "num_bytes" bytes
* of the PNG file signature. If the PNG data is embedded into another
@@ -51,7 +71,7 @@
* PNG signature (this is the same behavior as strcmp, memcmp, etc).
*/
int PNGAPI
-png_sig_cmp(png_const_bytep sig, png_size_t start, png_size_t num_to_check)
+png_sig_cmp(png_const_bytep sig, size_t start, size_t num_to_check)
{
png_byte png_signature[8] = {137, 80, 78, 71, 13, 10, 26, 10};
@@ -116,7 +136,7 @@
* trouble of calculating it.
*/
void /* PRIVATE */
-png_calculate_crc(png_structrp png_ptr, png_const_bytep ptr, png_size_t length)
+png_calculate_crc(png_structrp png_ptr, png_const_bytep ptr, size_t length)
{
int need_crc = 1;
@@ -401,7 +421,7 @@
* those cases where it does anything other than a memset.
*/
PNG_FUNCTION(void,PNGAPI
-png_info_init_3,(png_infopp ptr_ptr, png_size_t png_info_struct_size),
+png_info_init_3,(png_infopp ptr_ptr, size_t png_info_struct_size),
PNG_DEPRECATED)
{
png_inforp info_ptr = *ptr_ptr;
@@ -458,7 +478,7 @@
#ifdef PNG_TEXT_SUPPORTED
/* Free text item num or (if num == -1) all text items */
- if (info_ptr->text != 0 &&
+ if (info_ptr->text != NULL &&
((mask & PNG_FREE_TEXT) & info_ptr->free_me) != 0)
{
if (num != -1)
@@ -477,6 +497,7 @@
png_free(png_ptr, info_ptr->text);
info_ptr->text = NULL;
info_ptr->num_text = 0;
+ info_ptr->max_text = 0;
}
}
#endif
@@ -541,7 +562,7 @@
#ifdef PNG_sPLT_SUPPORTED
/* Free a given sPLT entry, or (if num == -1) all sPLT entries */
- if (info_ptr->splt_palettes != 0 &&
+ if (info_ptr->splt_palettes != NULL &&
((mask & PNG_FREE_SPLT) & info_ptr->free_me) != 0)
{
if (num != -1)
@@ -571,7 +592,7 @@
#endif
#ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED
- if (info_ptr->unknown_chunks != 0 &&
+ if (info_ptr->unknown_chunks != NULL &&
((mask & PNG_FREE_UNKN) & info_ptr->free_me) != 0)
{
if (num != -1)
@@ -594,6 +615,26 @@
}
#endif
+#ifdef PNG_eXIf_SUPPORTED
+ /* Free any eXIf entry */
+ if (((mask & PNG_FREE_EXIF) & info_ptr->free_me) != 0)
+ {
+# ifdef PNG_READ_eXIf_SUPPORTED
+ if (info_ptr->eXIf_buf)
+ {
+ png_free(png_ptr, info_ptr->eXIf_buf);
+ info_ptr->eXIf_buf = NULL;
+ }
+# endif
+ if (info_ptr->exif)
+ {
+ png_free(png_ptr, info_ptr->exif);
+ info_ptr->exif = NULL;
+ }
+ info_ptr->valid &= ~PNG_INFO_eXIf;
+ }
+#endif
+
#ifdef PNG_hIST_SUPPORTED
/* Free any hIST entry */
if (((mask & PNG_FREE_HIST) & info_ptr->free_me) != 0)
@@ -617,7 +658,7 @@
/* Free any image bits attached to the info structure */
if (((mask & PNG_FREE_ROWS) & info_ptr->free_me) != 0)
{
- if (info_ptr->row_pointers != 0)
+ if (info_ptr->row_pointers != NULL)
{
png_uint_32 row;
for (row = 0; row < info_ptr->height; row++)
@@ -684,7 +725,7 @@
void PNGAPI
png_save_int_32(png_bytep buf, png_int_32 i)
{
- png_save_uint_32(buf, i);
+ png_save_uint_32(buf, (png_uint_32)i);
}
# endif
@@ -695,7 +736,7 @@
int PNGAPI
png_convert_to_rfc1123_buffer(char out[29], png_const_timep ptime)
{
- static PNG_CONST char short_months[12][4] =
+ static const char short_months[12][4] =
{"Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
@@ -773,20 +814,14 @@
#ifdef PNG_STRING_COPYRIGHT
return PNG_STRING_COPYRIGHT
#else
-# ifdef __STDC__
return PNG_STRING_NEWLINE \
- "libpng version 1.6.24 - August 4, 2016" PNG_STRING_NEWLINE \
- "Copyright (c) 1998-2002,2004,2006-2016 Glenn Randers-Pehrson" \
+ "libpng version 1.6.37" PNG_STRING_NEWLINE \
+ "Copyright (c) 2018-2019 Cosmin Truta" PNG_STRING_NEWLINE \
+ "Copyright (c) 1998-2002,2004,2006-2018 Glenn Randers-Pehrson" \
PNG_STRING_NEWLINE \
"Copyright (c) 1996-1997 Andreas Dilger" PNG_STRING_NEWLINE \
"Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc." \
PNG_STRING_NEWLINE;
-# else
- return "libpng version 1.6.24 - August 4, 2016\
- Copyright (c) 1998-2002,2004,2006-2016 Glenn Randers-Pehrson\
- Copyright (c) 1996-1997 Andreas Dilger\
- Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.";
-# endif
#endif
}
@@ -901,7 +936,7 @@
/* The code is the fifth byte after each four byte string. Historically this
* code was always searched from the end of the list, this is no longer
- * necessary because the 'set' routine handles duplicate entries correcty.
+ * necessary because the 'set' routine handles duplicate entries correctly.
*/
do /* num_chunk_list > 0, so at least one */
{
@@ -1080,7 +1115,7 @@
png_colorspacerp colorspace, png_fixed_point gAMA)
{
/* Changed in libpng-1.5.4 to limit the values to ensure overflow can't
- * occur. Since the fixed point representation is asymetrical it is
+ * occur. Since the fixed point representation is asymmetrical it is
* possible for 1/gamma to overflow the limit of 21474 and this means the
* gamma value must be at least 5/100000 and hence at most 20000.0. For
* safety the limits here are a little narrower. The values are 0.00016 to
@@ -1872,12 +1907,12 @@
*/
if (intent < 0 || intent >= PNG_sRGB_INTENT_LAST)
return png_icc_profile_error(png_ptr, colorspace, "sRGB",
- (unsigned)intent, "invalid sRGB rendering intent");
+ (png_alloc_size_t)intent, "invalid sRGB rendering intent");
if ((colorspace->flags & PNG_COLORSPACE_HAVE_INTENT) != 0 &&
colorspace->rendering_intent != intent)
return png_icc_profile_error(png_ptr, colorspace, "sRGB",
- (unsigned)intent, "inconsistent rendering intents");
+ (png_alloc_size_t)intent, "inconsistent rendering intents");
if ((colorspace->flags & PNG_COLORSPACE_FROM_sRGB) != 0)
{
@@ -1931,16 +1966,49 @@
static const png_byte D50_nCIEXYZ[12] =
{ 0x00, 0x00, 0xf6, 0xd6, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0xd3, 0x2d };
-int /* PRIVATE */
-png_icc_check_length(png_const_structrp png_ptr, png_colorspacerp colorspace,
+static int /* bool */
+icc_check_length(png_const_structrp png_ptr, png_colorspacerp colorspace,
png_const_charp name, png_uint_32 profile_length)
{
if (profile_length < 132)
return png_icc_profile_error(png_ptr, colorspace, name, profile_length,
"too short");
+ return 1;
+}
+
+#ifdef PNG_READ_iCCP_SUPPORTED
+int /* PRIVATE */
+png_icc_check_length(png_const_structrp png_ptr, png_colorspacerp colorspace,
+ png_const_charp name, png_uint_32 profile_length)
+{
+ if (!icc_check_length(png_ptr, colorspace, name, profile_length))
+ return 0;
+
+ /* This needs to be here because the 'normal' check is in
+ * png_decompress_chunk, yet this happens after the attempt to
+ * png_malloc_base the required data. We only need this on read; on write
+ * the caller supplies the profile buffer so libpng doesn't allocate it. See
+ * the call to icc_check_length below (the write case).
+ */
+# ifdef PNG_SET_USER_LIMITS_SUPPORTED
+ else if (png_ptr->user_chunk_malloc_max > 0 &&
+ png_ptr->user_chunk_malloc_max < profile_length)
+ return png_icc_profile_error(png_ptr, colorspace, name, profile_length,
+ "exceeds application limits");
+# elif PNG_USER_CHUNK_MALLOC_MAX > 0
+ else if (PNG_USER_CHUNK_MALLOC_MAX < profile_length)
+ return png_icc_profile_error(png_ptr, colorspace, name, profile_length,
+ "exceeds libpng limits");
+# else /* !SET_USER_LIMITS */
+ /* This will get compiled out on all 32-bit and better systems. */
+ else if (PNG_SIZE_MAX < profile_length)
+ return png_icc_profile_error(png_ptr, colorspace, name, profile_length,
+ "exceeds system limits");
+# endif /* !SET_USER_LIMITS */
return 1;
}
+#endif /* READ_iCCP */
int /* PRIVATE */
png_icc_check_header(png_const_structrp png_ptr, png_colorspacerp colorspace,
@@ -1993,7 +2061,7 @@
*/
/* Data checks (could be skipped). These checks must be independent of the
- * version number; however, the version number doesn't accomodate changes in
+ * version number; however, the version number doesn't accommodate changes in
* the header fields (just the known tags and the interpretation of the
* data.)
*/
@@ -2149,15 +2217,6 @@
* being in range. All defined tag types have an 8 byte header - a 4 byte
* type signature then 0.
*/
- if ((tag_start & 3) != 0)
- {
- /* CNHP730S.icc shipped with Microsoft Windows 64 violates this, it is
- * only a warning here because libpng does not care about the
- * alignment.
- */
- (void)png_icc_profile_error(png_ptr, NULL, name, tag_id,
- "ICC profile tag start not a multiple of 4");
- }
/* This is a hard error; potentially it can cause read outside the
* profile.
@@ -2165,6 +2224,16 @@
if (tag_start > profile_length || tag_length > profile_length - tag_start)
return png_icc_profile_error(png_ptr, colorspace, name, tag_id,
"ICC profile tag outside profile");
+
+ if ((tag_start & 3) != 0)
+ {
+ /* CNHP730S.icc shipped with Microsoft Windows 64 violates this; it is
+ * only a warning here because libpng does not care about the
+ * alignment.
+ */
+ (void)png_icc_profile_error(png_ptr, NULL, name, tag_id,
+ "ICC profile tag start not a multiple of 4");
+ }
}
return 1; /* success, maybe with warnings */
@@ -2377,7 +2446,7 @@
if ((colorspace->flags & PNG_COLORSPACE_INVALID) != 0)
return 0;
- if (png_icc_check_length(png_ptr, colorspace, name, profile_length) != 0 &&
+ if (icc_check_length(png_ptr, colorspace, name, profile_length) != 0 &&
png_icc_check_header(png_ptr, colorspace, name, profile_length, profile,
color_type) != 0 &&
png_icc_check_tag_table(png_ptr, colorspace, name, profile_length,
@@ -2495,7 +2564,7 @@
error = 1;
}
- if (png_gt(((width + 7) & (~7)),
+ if (png_gt(((width + 7) & (~7U)),
((PNG_SIZE_MAX
- 48 /* big_row_buf hack */
- 1) /* filter byte */
@@ -2632,7 +2701,7 @@
#if defined(PNG_sCAL_SUPPORTED) || defined(PNG_pCAL_SUPPORTED)
/* ASCII to fp functions */
-/* Check an ASCII formated floating point value, see the more detailed
+/* Check an ASCII formatted floating point value, see the more detailed
* comments in pngpriv.h
*/
/* The following is used internally to preserve the sticky flags */
@@ -2640,11 +2709,11 @@
#define png_fp_set(state, value) ((state) = (value) | ((state) & PNG_FP_STICKY))
int /* PRIVATE */
-png_check_fp_number(png_const_charp string, png_size_t size, int *statep,
+png_check_fp_number(png_const_charp string, size_t size, int *statep,
png_size_tp whereami)
{
int state = *statep;
- png_size_t i = *whereami;
+ size_t i = *whereami;
while (i < size)
{
@@ -2767,10 +2836,10 @@
/* The same but for a complete string. */
int
-png_check_fp_string(png_const_charp string, png_size_t size)
+png_check_fp_string(png_const_charp string, size_t size)
{
int state=0;
- png_size_t char_index=0;
+ size_t char_index=0;
if (png_check_fp_number(string, size, &state, &char_index) != 0 &&
(char_index == size || string[char_index] == 0))
@@ -2797,7 +2866,7 @@
if (power < 0)
{
if (power < DBL_MIN_10_EXP) return 0;
- recip = 1, power = -power;
+ recip = 1; power = -power;
}
if (power > 0)
@@ -2822,8 +2891,16 @@
/* Function to format a floating point value in ASCII with a given
* precision.
*/
+#if GCC_STRICT_OVERFLOW
+#pragma GCC diagnostic push
+/* The problem arises below with exp_b10, which can never overflow because it
+ * comes, originally, from frexp and is therefore limited to a range which is
+ * typically +/-710 (log2(DBL_MAX)/log2(DBL_MIN)).
+ */
+#pragma GCC diagnostic warning "-Wstrict-overflow=2"
+#endif /* GCC_STRICT_OVERFLOW */
void /* PRIVATE */
-png_ascii_from_fp(png_const_structrp png_ptr, png_charp ascii, png_size_t size,
+png_ascii_from_fp(png_const_structrp png_ptr, png_charp ascii, size_t size,
double fp, unsigned int precision)
{
/* We use standard functions from math.h, but not printf because
@@ -2875,7 +2952,9 @@
double test = png_pow10(exp_b10+1);
if (test <= DBL_MAX)
- ++exp_b10, base = test;
+ {
+ ++exp_b10; base = test;
+ }
else
break;
@@ -2889,7 +2968,10 @@
* test on DBL_MAX above.
*/
fp /= base;
- while (fp >= 1) fp /= 10, ++exp_b10;
+ while (fp >= 1)
+ {
+ fp /= 10; ++exp_b10;
+ }
/* Because of the code above fp may, at this point, be
* less than .1, this is ok because the code below can
@@ -2906,7 +2988,7 @@
*/
if (exp_b10 < 0 && exp_b10 > -3) /* PLUS 3 TOTAL 4 */
{
- czero = -exp_b10; /* PLUS 2 digits: TOTAL 3 */
+ czero = 0U-exp_b10; /* PLUS 2 digits: TOTAL 3 */
exp_b10 = 0; /* Dot added below before first output. */
}
else
@@ -2940,7 +3022,7 @@
/* Rounding up to 10, handle that here. */
if (czero > 0)
{
- --czero, d = 1;
+ --czero; d = 1;
if (cdigits == 0) --clead;
}
else
@@ -2954,7 +3036,7 @@
else if (ch == 46)
{
- ch = *--ascii, ++size;
+ ch = *--ascii; ++size;
/* Advance exp_b10 to '1', so that the
* decimal point happens after the
* previous digit.
@@ -2981,7 +3063,9 @@
int ch = *--ascii;
if (ch == 46)
- ++size, exp_b10 = 1;
+ {
+ ++size; exp_b10 = 1;
+ }
/* Else lost a leading zero, so 'exp_b10' is
* still ok at (-1)
@@ -3017,21 +3101,26 @@
*/
if (exp_b10 != (-1))
{
- if (exp_b10 == 0) *ascii++ = 46, --size;
+ if (exp_b10 == 0)
+ {
+ *ascii++ = 46; --size;
+ }
/* PLUS 1: TOTAL 4 */
--exp_b10;
}
- *ascii++ = 48, --czero;
+ *ascii++ = 48; --czero;
}
if (exp_b10 != (-1))
{
if (exp_b10 == 0)
- *ascii++ = 46, --size; /* counted above */
+ {
+ *ascii++ = 46; --size; /* counted above */
+ }
--exp_b10;
}
- *ascii++ = (char)(48 + (int)d), ++cdigits;
+ *ascii++ = (char)(48 + (int)d); ++cdigits;
}
}
while (cdigits+czero < precision+clead && fp > DBL_MIN);
@@ -3039,11 +3128,11 @@
/* The total output count (max) is now 4+precision */
/* Check for an exponent, if we don't need one we are
- * done and just need to terminate the string. At
- * this point exp_b10==(-1) is effectively if flag - it got
- * to '-1' because of the decrement after outputting
- * the decimal point above (the exponent required is
- * *not* -1!)
+ * done and just need to terminate the string. At this
+ * point, exp_b10==(-1) is effectively a flag: it got
+ * to '-1' because of the decrement, after outputting
+ * the decimal point above. (The exponent required is
+ * *not* -1.)
*/
if (exp_b10 >= (-1) && exp_b10 <= 2)
{
@@ -3054,7 +3143,7 @@
* zeros were *not* output, so this doesn't increase
* the output count.
*/
- while (--exp_b10 >= 0) *ascii++ = 48;
+ while (exp_b10-- > 0) *ascii++ = 48;
*ascii = 0;
@@ -3072,7 +3161,7 @@
*/
size -= cdigits;
- *ascii++ = 69, --size; /* 'E': PLUS 1 TOTAL 2+precision */
+ *ascii++ = 69; --size; /* 'E': PLUS 1 TOTAL 2+precision */
/* The following use of an unsigned temporary avoids ambiguities in
* the signed arithmetic on exp_b10 and permits GCC at least to do
@@ -3083,12 +3172,12 @@
if (exp_b10 < 0)
{
- *ascii++ = 45, --size; /* '-': PLUS 1 TOTAL 3+precision */
- uexp_b10 = -exp_b10;
+ *ascii++ = 45; --size; /* '-': PLUS 1 TOTAL 3+precision */
+ uexp_b10 = 0U-exp_b10;
}
else
- uexp_b10 = exp_b10;
+ uexp_b10 = 0U+exp_b10;
cdigits = 0;
@@ -3131,6 +3220,9 @@
/* Here on buffer too small. */
png_error(png_ptr, "ASCII conversion buffer too small");
}
+#if GCC_STRICT_OVERFLOW
+#pragma GCC diagnostic pop
+#endif /* GCC_STRICT_OVERFLOW */
# endif /* FLOATING_POINT */
@@ -3139,7 +3231,7 @@
*/
void /* PRIVATE */
png_ascii_from_fixed(png_const_structrp png_ptr, png_charp ascii,
- png_size_t size, png_fixed_point fp)
+ size_t size, png_fixed_point fp)
{
/* Require space for 10 decimal digits, a decimal point, a minus sign and a
* trailing \0, 13 characters:
@@ -3150,9 +3242,11 @@
/* Avoid overflow here on the minimum integer. */
if (fp < 0)
- *ascii++ = 45, num = -fp;
+ {
+ *ascii++ = 45; num = (png_uint_32)(-fp);
+ }
else
- num = fp;
+ num = (png_uint_32)fp;
if (num <= 0x80000000) /* else overflowed */
{
@@ -3188,7 +3282,10 @@
* then ndigits digits to first:
*/
i = 5;
- while (ndigits < i) *ascii++ = 48, --i;
+ while (ndigits < i)
+ {
+ *ascii++ = 48; --i;
+ }
while (ndigits >= first) *ascii++ = digits[--ndigits];
/* Don't output the trailing zeros! */
}
@@ -3239,6 +3336,15 @@
* the nearest .00001). Overflow and divide by zero are signalled in
* the result, a boolean - true on success, false on overflow.
*/
+#if GCC_STRICT_OVERFLOW /* from above */
+/* It is not obvious which comparison below gets optimized in such a way that
+ * signed overflow would change the result; looking through the code does not
+ * reveal any tests which have the form GCC complains about, so presumably the
+ * optimizer is moving an add or subtract into the 'if' somewhere.
+ */
+#pragma GCC diagnostic push
+#pragma GCC diagnostic warning "-Wstrict-overflow=2"
+#endif /* GCC_STRICT_OVERFLOW */
int
png_muldiv(png_fixed_point_p res, png_fixed_point a, png_int_32 times,
png_int_32 divisor)
@@ -3353,6 +3459,9 @@
return 0;
}
+#if GCC_STRICT_OVERFLOW
+#pragma GCC diagnostic pop
+#endif /* GCC_STRICT_OVERFLOW */
#endif /* READ_GAMMA || INCH_CONVERSIONS */
#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_INCH_CONVERSIONS_SUPPORTED)
@@ -3646,7 +3755,7 @@
* of getting this accuracy in practice.
*
* To deal with this the following exp() function works out the exponent of the
- * frational part of the logarithm by using an accurate 32-bit value from the
+ * fractional part of the logarithm by using an accurate 32-bit value from the
* top four fractional bits then multiplying in the remaining bits.
*/
static const png_uint_32
@@ -3861,18 +3970,18 @@
*/
static void
png_build_16bit_table(png_structrp png_ptr, png_uint_16pp *ptable,
- PNG_CONST unsigned int shift, PNG_CONST png_fixed_point gamma_val)
+ unsigned int shift, png_fixed_point gamma_val)
{
/* Various values derived from 'shift': */
- PNG_CONST unsigned int num = 1U << (8U - shift);
+ unsigned int num = 1U << (8U - shift);
#ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED
/* CSE the division and work round wacky GCC warnings (see the comments
* in png_gamma_8bit_correct for where these come from.)
*/
- PNG_CONST double fmax = 1./(((png_int_32)1 << (16U - shift))-1);
+ double fmax = 1.0 / (((png_int_32)1 << (16U - shift)) - 1);
#endif
- PNG_CONST unsigned int max = (1U << (16U - shift))-1U;
- PNG_CONST unsigned int max_by_2 = 1U << (15U-shift);
+ unsigned int max = (1U << (16U - shift)) - 1U;
+ unsigned int max_by_2 = 1U << (15U - shift);
unsigned int i;
png_uint_16pp table = *ptable =
@@ -3938,10 +4047,10 @@
*/
static void
png_build_16to8_table(png_structrp png_ptr, png_uint_16pp *ptable,
- PNG_CONST unsigned int shift, PNG_CONST png_fixed_point gamma_val)
+ unsigned int shift, png_fixed_point gamma_val)
{
- PNG_CONST unsigned int num = 1U << (8U - shift);
- PNG_CONST unsigned int max = (1U << (16U - shift))-1U;
+ unsigned int num = 1U << (8U - shift);
+ unsigned int max = (1U << (16U - shift))-1U;
unsigned int i;
png_uint_32 last;
@@ -4006,7 +4115,7 @@
*/
static void
png_build_8bit_table(png_structrp png_ptr, png_bytepp ptable,
- PNG_CONST png_fixed_point gamma_val)
+ png_fixed_point gamma_val)
{
unsigned int i;
png_bytep table = *ptable = (png_bytep)png_malloc(png_ptr, 256);
@@ -4225,13 +4334,13 @@
if (png_ptr != NULL && option >= 0 && option < PNG_OPTION_NEXT &&
(option & 1) == 0)
{
- int mask = 3 << option;
- int setting = (2 + (onoff != 0)) << option;
- int current = png_ptr->options;
+ png_uint_32 mask = 3U << option;
+ png_uint_32 setting = (2U + (onoff != 0)) << option;
+ png_uint_32 current = png_ptr->options;
- png_ptr->options = (png_byte)(((current & ~mask) | setting) & 0xff);
+ png_ptr->options = (png_uint_32)((current & ~mask) | setting);
- return (current & mask) >> option;
+ return (int)(current & mask) >> option;
}
return PNG_OPTION_INVALID;
@@ -4243,7 +4352,7 @@
defined(PNG_SIMPLIFIED_WRITE_SUPPORTED)
/* sRGB conversion tables; these are machine generated with the code in
* contrib/tools/makesRGB.c. The actual sRGB transfer curve defined in the
- * specification (see the article at http://en.wikipedia.org/wiki/SRGB)
+ * specification (see the article at https://en.wikipedia.org/wiki/SRGB)
* is used, not the gamma=1/2.2 approximation use elsewhere in libpng.
* The sRGB to linear table is exact (to the nearest 16-bit linear fraction).
* The inverse (linear to sRGB) table has accuracies as follows:
@@ -4479,8 +4588,7 @@
if (image != NULL && image->opaque != NULL &&
image->opaque->error_buf == NULL)
{
- /* Ignore errors here: */
- (void)png_safe_execute(image, png_image_free_function, image);
+ png_image_free_function(image);
image->opaque = NULL;
}
}
diff --git a/png.h b/png.h
index ebfb3dd..139eb0d 100644
--- a/png.h
+++ b/png.h
@@ -1,72 +1,105 @@
/* png.h - header file for PNG reference library
*
- * libpng version 1.6.24, August 4, 2016
+ * libpng version 1.6.37 - April 14, 2019
*
- * Copyright (c) 1998-2002,2004,2006-2016 Glenn Randers-Pehrson
- * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
- * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
+ * Copyright (c) 2018-2019 Cosmin Truta
+ * Copyright (c) 1998-2002,2004,2006-2018 Glenn Randers-Pehrson
+ * Copyright (c) 1996-1997 Andreas Dilger
+ * Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
*
- * This code is released under the libpng license (See LICENSE, below)
+ * This code is released under the libpng license. (See LICENSE, below.)
*
* Authors and maintainers:
* libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat
* libpng versions 0.89, June 1996, through 0.96, May 1997: Andreas Dilger
- * libpng versions 0.97, January 1998, through 1.6.24, August 4, 2016:
- * Glenn Randers-Pehrson.
+ * libpng versions 0.97, January 1998, through 1.6.35, July 2018:
+ * Glenn Randers-Pehrson
+ * libpng versions 1.6.36, December 2018, through 1.6.37, April 2019:
+ * Cosmin Truta
* See also "Contributing Authors", below.
*/
/*
- * COPYRIGHT NOTICE, DISCLAIMER, and LICENSE:
+ * COPYRIGHT NOTICE, DISCLAIMER, and LICENSE
+ * =========================================
*
- * If you modify libpng you may insert additional notices immediately following
- * this sentence.
+ * PNG Reference Library License version 2
+ * ---------------------------------------
*
- * This code is released under the libpng license.
+ * * Copyright (c) 1995-2019 The PNG Reference Library Authors.
+ * * Copyright (c) 2018-2019 Cosmin Truta.
+ * * Copyright (c) 2000-2002, 2004, 2006-2018 Glenn Randers-Pehrson.
+ * * Copyright (c) 1996-1997 Andreas Dilger.
+ * * Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
*
- * Some files in the "contrib" directory and some configure-generated
- * files that are distributed with libpng have other copyright owners and
- * are released under other open source licenses.
+ * The software is supplied "as is", without warranty of any kind,
+ * express or implied, including, without limitation, the warranties
+ * of merchantability, fitness for a particular purpose, title, and
+ * non-infringement. In no event shall the Copyright owners, or
+ * anyone distributing the software, be liable for any damages or
+ * other liability, whether in contract, tort or otherwise, arising
+ * from, out of, or in connection with the software, or the use or
+ * other dealings in the software, even if advised of the possibility
+ * of such damage.
*
- * libpng versions 1.0.7, July 1, 2000 through 1.6.24, August 4, 2016 are
- * Copyright (c) 2000-2002, 2004, 2006-2016 Glenn Randers-Pehrson, are
+ * Permission is hereby granted to use, copy, modify, and distribute
+ * this software, or portions hereof, for any purpose, without fee,
+ * subject to the following restrictions:
+ *
+ * 1. The origin of this software must not be misrepresented; you
+ * must not claim that you wrote the original software. If you
+ * use this software in a product, an acknowledgment in the product
+ * documentation would be appreciated, but is not required.
+ *
+ * 2. Altered source versions must be plainly marked as such, and must
+ * not be misrepresented as being the original software.
+ *
+ * 3. This Copyright notice may not be removed or altered from any
+ * source or altered source distribution.
+ *
+ *
+ * PNG Reference Library License version 1 (for libpng 0.5 through 1.6.35)
+ * -----------------------------------------------------------------------
+ *
+ * libpng versions 1.0.7, July 1, 2000, through 1.6.35, July 15, 2018 are
+ * Copyright (c) 2000-2002, 2004, 2006-2018 Glenn Randers-Pehrson, are
* derived from libpng-1.0.6, and are distributed according to the same
* disclaimer and license as libpng-1.0.6 with the following individuals
* added to the list of Contributing Authors:
*
- * Simon-Pierre Cadieux
- * Eric S. Raymond
- * Mans Rullgard
- * Cosmin Truta
- * Gilles Vollant
- * James Yu
+ * Simon-Pierre Cadieux
+ * Eric S. Raymond
+ * Mans Rullgard
+ * Cosmin Truta
+ * Gilles Vollant
+ * James Yu
+ * Mandar Sahastrabuddhe
+ * Google Inc.
+ * Vadim Barkov
*
* and with the following additions to the disclaimer:
*
- * There is no warranty against interference with your enjoyment of the
- * library or against infringement. There is no warranty that our
- * efforts or the library will fulfill any of your particular purposes
- * or needs. This library is provided with all faults, and the entire
- * risk of satisfactory quality, performance, accuracy, and effort is with
- * the user.
+ * There is no warranty against interference with your enjoyment of
+ * the library or against infringement. There is no warranty that our
+ * efforts or the library will fulfill any of your particular purposes
+ * or needs. This library is provided with all faults, and the entire
+ * risk of satisfactory quality, performance, accuracy, and effort is
+ * with the user.
*
- * Some files in the "contrib" directory have other copyright owners and
+ * Some files in the "contrib" directory and some configure-generated
+ * files that are distributed with libpng have other copyright owners, and
* are released under other open source licenses.
*
- *
* libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are
* Copyright (c) 1998-2000 Glenn Randers-Pehrson, are derived from
* libpng-0.96, and are distributed according to the same disclaimer and
- * license as libpng-0.96, with the following individuals added to the list
- * of Contributing Authors:
+ * license as libpng-0.96, with the following individuals added to the
+ * list of Contributing Authors:
*
- * Tom Lane
- * Glenn Randers-Pehrson
- * Willem van Schaik
- *
- * Some files in the "scripts" directory have different copyright owners
- * but are also released under this license.
+ * Tom Lane
+ * Glenn Randers-Pehrson
+ * Willem van Schaik
*
* libpng versions 0.89, June 1996, through 0.96, May 1997, are
* Copyright (c) 1996-1997 Andreas Dilger, are derived from libpng-0.88,
@@ -74,14 +107,14 @@
* libpng-0.88, with the following individuals added to the list of
* Contributing Authors:
*
- * John Bowler
- * Kevin Bracey
- * Sam Bushell
- * Magnus Holmgren
- * Greg Roelofs
- * Tom Tanner
+ * John Bowler
+ * Kevin Bracey
+ * Sam Bushell
+ * Magnus Holmgren
+ * Greg Roelofs
+ * Tom Tanner
*
- * Some files in the "scripts" directory have other copyright owners
+ * Some files in the "scripts" directory have other copyright owners,
* but are released under this license.
*
* libpng versions 0.5, May 1995, through 0.88, January 1996, are
@@ -90,62 +123,49 @@
* For the purposes of this copyright and license, "Contributing Authors"
* is defined as the following set of individuals:
*
- * Andreas Dilger
- * Dave Martindale
- * Guy Eric Schalnat
- * Paul Schmidt
- * Tim Wegner
+ * Andreas Dilger
+ * Dave Martindale
+ * Guy Eric Schalnat
+ * Paul Schmidt
+ * Tim Wegner
*
- * The PNG Reference Library is supplied "AS IS". The Contributing Authors
- * and Group 42, Inc. disclaim all warranties, expressed or implied,
- * including, without limitation, the warranties of merchantability and of
- * fitness for any purpose. The Contributing Authors and Group 42, Inc.
- * assume no liability for direct, indirect, incidental, special, exemplary,
- * or consequential damages, which may result from the use of the PNG
- * Reference Library, even if advised of the possibility of such damage.
+ * The PNG Reference Library is supplied "AS IS". The Contributing
+ * Authors and Group 42, Inc. disclaim all warranties, expressed or
+ * implied, including, without limitation, the warranties of
+ * merchantability and of fitness for any purpose. The Contributing
+ * Authors and Group 42, Inc. assume no liability for direct, indirect,
+ * incidental, special, exemplary, or consequential damages, which may
+ * result from the use of the PNG Reference Library, even if advised of
+ * the possibility of such damage.
*
* Permission is hereby granted to use, copy, modify, and distribute this
* source code, or portions hereof, for any purpose, without fee, subject
* to the following restrictions:
*
- * 1. The origin of this source code must not be misrepresented.
+ * 1. The origin of this source code must not be misrepresented.
*
- * 2. Altered versions must be plainly marked as such and must not
- * be misrepresented as being the original source.
+ * 2. Altered versions must be plainly marked as such and must not
+ * be misrepresented as being the original source.
*
- * 3. This Copyright notice may not be removed or altered from any
- * source or altered source distribution.
+ * 3. This Copyright notice may not be removed or altered from any
+ * source or altered source distribution.
*
- * The Contributing Authors and Group 42, Inc. specifically permit, without
- * fee, and encourage the use of this source code as a component to
- * supporting the PNG file format in commercial products. If you use this
- * source code in a product, acknowledgment is not required but would be
- * appreciated.
+ * The Contributing Authors and Group 42, Inc. specifically permit,
+ * without fee, and encourage the use of this source code as a component
+ * to supporting the PNG file format in commercial products. If you use
+ * this source code in a product, acknowledgment is not required but would
+ * be appreciated.
*
* END OF COPYRIGHT NOTICE, DISCLAIMER, and LICENSE.
*
- * TRADEMARK:
+ * TRADEMARK
+ * =========
*
- * The name "libpng" has not been registered by the Copyright owner
+ * The name "libpng" has not been registered by the Copyright owners
* as a trademark in any jurisdiction. However, because libpng has
* been distributed and maintained world-wide, continually since 1995,
- * the Copyright owner claims "common-law trademark protection" in any
+ * the Copyright owners claim "common-law trademark protection" in any
* jurisdiction where common-law trademark is recognized.
- *
- * OSI CERTIFICATION:
- *
- * Libpng is OSI Certified Open Source Software. OSI Certified Open Source is
- * a certification mark of the Open Source Initiative. OSI has not addressed
- * the additional disclaimers inserted at version 1.0.7.
- *
- * EXPORT CONTROL:
- *
- * The Copyright owner believes that the Export Control Classification
- * Number (ECCN) for libpng is EAR99, which means not subject to export
- * controls or International Traffic in Arms Regulations (ITAR) because
- * it is open source, publicly available software, that does not contain
- * any encryption software. See the EAR, paragraphs 734.3(b)(3) and
- * 734.7(b).
*/
/*
@@ -211,23 +231,25 @@
* 1.0.7rc1-2 1 10007 2.1.0.7rc1-2 (binary compatible)
* 1.0.7 1 10007 (still compatible)
* ...
- * 1.0.19 10 10019 10.so.0.19[.0]
+ * 1.0.69 10 10069 10.so.0.69[.0]
* ...
- * 1.2.56 13 10256 12.so.0.56[.0]
+ * 1.2.59 13 10259 12.so.0.59[.0]
* ...
- * 1.5.27 15 10527 15.so.15.27[.0]
+ * 1.4.20 14 10420 14.so.0.20[.0]
* ...
- * 1.6.24 16 10624 16.so.16.24[.0]
+ * 1.5.30 15 10530 15.so.15.30[.0]
+ * ...
+ * 1.6.37 16 10637 16.so.16.37[.0]
*
- * Henceforth the source version will match the shared-library major
- * and minor numbers; the shared-library major version number will be
- * used for changes in backward compatibility, as it is intended. The
- * PNG_LIBPNG_VER macro, which is not used within libpng but is available
- * for applications, is an unsigned integer of the form xyyzz corresponding
- * to the source version x.y.z (leading zeros in y and z). Beta versions
- * were given the previous public release number plus a letter, until
- * version 1.0.6j; from then on they were given the upcoming public
- * release number plus "betaNN" or "rcNN".
+ * Henceforth the source version will match the shared-library major and
+ * minor numbers; the shared-library major version number will be used for
+ * changes in backward compatibility, as it is intended.
+ * The PNG_LIBPNG_VER macro, which is not used within libpng but is
+ * available for applications, is an unsigned integer of the form XYYZZ
+ * corresponding to the source version X.Y.Z (leading zeros in Y and Z).
+ * Beta versions were given the previous public release number plus a
+ * letter, until version 1.0.6j; from then on they were given the upcoming
+ * public release number plus "betaNN" or "rcNN".
*
* Binary incompatibility exists only when applications make direct access
* to the info_ptr or png_ptr members through png.h, and the compiled
@@ -237,65 +259,8 @@
* in binary compatibility (e.g., when a new feature is added).
*
* See libpng.txt or libpng.3 for more information. The PNG specification
- * is available as a W3C Recommendation and as an ISO Specification,
- * <http://www.w3.org/TR/2003/REC-PNG-20031110/
- */
-
-/*
- * Y2K compliance in libpng:
- * =========================
- *
- * August 4, 2016
- *
- * Since the PNG Development group is an ad-hoc body, we can't make
- * an official declaration.
- *
- * This is your unofficial assurance that libpng from version 0.71 and
- * upward through 1.6.24 are Y2K compliant. It is my belief that
- * earlier versions were also Y2K compliant.
- *
- * Libpng only has two year fields. One is a 2-byte unsigned integer
- * that will hold years up to 65535. The other, which is deprecated,
- * holds the date in text format, and will hold years up to 9999.
- *
- * The integer is
- * "png_uint_16 year" in png_time_struct.
- *
- * The string is
- * "char time_buffer[29]" in png_struct. This is no longer used
- * in libpng-1.6.x and will be removed from libpng-1.7.0.
- *
- * There are seven time-related functions:
- * png.c: png_convert_to_rfc_1123_buffer() in png.c
- * (formerly png_convert_to_rfc_1123() prior to libpng-1.5.x and
- * png_convert_to_rfc_1152() in error prior to libpng-0.98)
- * png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c
- * png_convert_from_time_t() in pngwrite.c
- * png_get_tIME() in pngget.c
- * png_handle_tIME() in pngrutil.c, called in pngread.c
- * png_set_tIME() in pngset.c
- * png_write_tIME() in pngwutil.c, called in pngwrite.c
- *
- * All handle dates properly in a Y2K environment. The
- * png_convert_from_time_t() function calls gmtime() to convert from system
- * clock time, which returns (year - 1900), which we properly convert to
- * the full 4-digit year. There is a possibility that libpng applications
- * are not passing 4-digit years into the png_convert_to_rfc_1123_buffer()
- * function, or that they are incorrectly passing only a 2-digit year
- * instead of "year - 1900" into the png_convert_from_struct_tm() function,
- * but this is not under our control. The libpng documentation has always
- * stated that it works with 4-digit years, and the APIs have been
- * documented as such.
- *
- * The tIME chunk itself is also Y2K compliant. It uses a 2-byte unsigned
- * integer to hold the year, and can hold years as large as 65535.
- *
- * zlib, upon which libpng depends, is also Y2K compliant. It contains
- * no date-related code.
- *
- * Glenn Randers-Pehrson
- * libpng maintainer
- * PNG Development Group
+ * is available as a W3C Recommendation and as an ISO/IEC Standard; see
+ * <https://www.w3.org/TR/2003/REC-PNG-20031110/>
*/
#ifndef PNG_H
@@ -313,8 +278,8 @@
*/
/* Version information for png.h - this should match the version in png.c */
-#define PNG_LIBPNG_VER_STRING "1.6.24"
-#define PNG_HEADER_VERSION_STRING " libpng version 1.6.24 - August 4, 2016\n"
+#define PNG_LIBPNG_VER_STRING "1.6.37"
+#define PNG_HEADER_VERSION_STRING " libpng version 1.6.37 - April 14, 2019\n"
#define PNG_LIBPNG_VER_SONUM 16
#define PNG_LIBPNG_VER_DLLNUM 16
@@ -322,12 +287,11 @@
/* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */
#define PNG_LIBPNG_VER_MAJOR 1
#define PNG_LIBPNG_VER_MINOR 6
-#define PNG_LIBPNG_VER_RELEASE 24
+#define PNG_LIBPNG_VER_RELEASE 37
-/* This should match the numeric part of the final component of
- * PNG_LIBPNG_VER_STRING, omitting any leading zero:
+/* This should be zero for a public release, or non-zero for a
+ * development version. [Deprecated]
*/
-
#define PNG_LIBPNG_VER_BUILD 0
/* Release Status */
@@ -347,13 +311,14 @@
#define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_STABLE
-/* Careful here. At one time, Guy wanted to use 082, but that would be octal.
- * We must not include leading zeros.
- * Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only
- * version 1.0.0 was mis-numbered 100 instead of 10000). From
- * version 1.0.1 it's xxyyzz, where x=major, y=minor, z=release
+/* Careful here. At one time, Guy wanted to use 082, but that
+ * would be octal. We must not include leading zeros.
+ * Versions 0.7 through 1.0.0 were in the range 0 to 100 here
+ * (only version 1.0.0 was mis-numbered 100 instead of 10000).
+ * From version 1.0.1 it is:
+ * XXYYZZ, where XX=major, YY=minor, ZZ=release
*/
-#define PNG_LIBPNG_VER 10624 /* 1.6.24 */
+#define PNG_LIBPNG_VER 10637 /* 1.6.37 */
/* Library configuration: these options cannot be changed after
* the library has been built.
@@ -463,7 +428,7 @@
/* This triggers a compiler error in png.c, if png.c and png.h
* do not agree upon the version number.
*/
-typedef char* png_libpng_version_1_6_24;
+typedef char* png_libpng_version_1_6_37;
/* Basic control structions. Read libpng-manual.txt or libpng.3 for more info.
*
@@ -604,8 +569,8 @@
png_charp key; /* keyword, 1-79 character description of "text" */
png_charp text; /* comment, may be an empty string (ie "")
or a NULL pointer */
- png_size_t text_length; /* length of the text string */
- png_size_t itxt_length; /* length of the itxt string */
+ size_t text_length; /* length of the text string */
+ size_t itxt_length; /* length of the itxt string */
png_charp lang; /* language code, 0-79 characters
or a NULL pointer */
png_charp lang_key; /* keyword translated UTF-8 string, 0 or more
@@ -658,7 +623,7 @@
{
png_byte name[5]; /* Textual chunk name with '\0' terminator */
png_byte *data; /* Data, should not be modified on read! */
- png_size_t size;
+ size_t size;
/* On write 'location' must be set using the flag values listed below.
* Notice that on read it is set by libpng however the values stored have
@@ -683,7 +648,7 @@
/* Maximum positive integer used in PNG is (2^31)-1 */
#define PNG_UINT_31_MAX ((png_uint_32)0x7fffffffL)
#define PNG_UINT_32_MAX ((png_uint_32)(-1))
-#define PNG_SIZE_MAX ((png_size_t)(-1))
+#define PNG_SIZE_MAX ((size_t)(-1))
/* These are constants for fixed point values encoded in the
* PNG specification manner (x100000)
@@ -780,6 +745,7 @@
#define PNG_INFO_sPLT 0x2000U /* ESR, 1.0.6 */
#define PNG_INFO_sCAL 0x4000U /* ESR, 1.0.6 */
#define PNG_INFO_IDAT 0x8000U /* ESR, 1.0.6 */
+#define PNG_INFO_eXIf 0x10000U /* GR-P, 1.6.31 */
/* This is used for the transformation routines, as some of them
* change these values for the row. It also should enable using
@@ -788,7 +754,7 @@
typedef struct png_row_info_struct
{
png_uint_32 width; /* width of row */
- png_size_t rowbytes; /* number of bytes in row */
+ size_t rowbytes; /* number of bytes in row */
png_byte color_type; /* color type of row */
png_byte bit_depth; /* bit depth of row */
png_byte channels; /* number of channels (1, 2, 3, or 4) */
@@ -807,7 +773,7 @@
* expected to return the read data in the buffer.
*/
typedef PNG_CALLBACK(void, *png_error_ptr, (png_structp, png_const_charp));
-typedef PNG_CALLBACK(void, *png_rw_ptr, (png_structp, png_bytep, png_size_t));
+typedef PNG_CALLBACK(void, *png_rw_ptr, (png_structp, png_bytep, size_t));
typedef PNG_CALLBACK(void, *png_flush_ptr, (png_structp));
typedef PNG_CALLBACK(void, *png_read_status_ptr, (png_structp, png_uint_32,
int));
@@ -944,8 +910,8 @@
* signature, and non-zero otherwise. Having num_to_check == 0 or
* start > 7 will always fail (ie return non-zero).
*/
-PNG_EXPORT(3, int, png_sig_cmp, (png_const_bytep sig, png_size_t start,
- png_size_t num_to_check));
+PNG_EXPORT(3, int, png_sig_cmp, (png_const_bytep sig, size_t start,
+ size_t num_to_check));
/* Simple signature checking function. This is the same as calling
* png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n).
@@ -964,11 +930,11 @@
png_error_ptr warn_fn),
PNG_ALLOCATED);
-PNG_EXPORT(6, png_size_t, png_get_compression_buffer_size,
+PNG_EXPORT(6, size_t, png_get_compression_buffer_size,
(png_const_structrp png_ptr));
PNG_EXPORT(7, void, png_set_compression_buffer_size, (png_structrp png_ptr,
- png_size_t size));
+ size_t size));
/* Moved from pngconf.h in 1.4.0 and modified to ensure setjmp/longjmp
* match up.
@@ -1021,7 +987,7 @@
/* Write a PNG chunk - size, type, (optional) data, CRC. */
PNG_EXPORT(14, void, png_write_chunk, (png_structrp png_ptr, png_const_bytep
- chunk_name, png_const_bytep data, png_size_t length));
+ chunk_name, png_const_bytep data, size_t length));
/* Write the start of a PNG chunk - length and chunk name. */
PNG_EXPORT(15, void, png_write_chunk_start, (png_structrp png_ptr,
@@ -1029,7 +995,7 @@
/* Write the data of a PNG chunk started with png_write_chunk_start(). */
PNG_EXPORT(16, void, png_write_chunk_data, (png_structrp png_ptr,
- png_const_bytep data, png_size_t length));
+ png_const_bytep data, size_t length));
/* Finish a chunk started with png_write_chunk_start() (includes CRC). */
PNG_EXPORT(17, void, png_write_chunk_end, (png_structrp png_ptr));
@@ -1043,7 +1009,7 @@
* the API will be removed in the future.
*/
PNG_EXPORTA(19, void, png_info_init_3, (png_infopp info_ptr,
- png_size_t png_info_struct_size), PNG_DEPRECATED);
+ size_t png_info_struct_size), PNG_DEPRECATED);
/* Writes all the PNG information before the image. */
PNG_EXPORT(20, void, png_write_info_before_PLTE,
@@ -1140,7 +1106,7 @@
* corresponding composited pixel, and the color channels are unassociated
* (not premultiplied). The gamma encoded color channels must be scaled
* according to the contribution and to do this it is necessary to undo
- * the encoding, scale the color values, perform the composition and reencode
+ * the encoding, scale the color values, perform the composition and re-encode
* the values. This is the 'PNG' mode.
*
* The alternative is to 'associate' the alpha with the color information by
@@ -1196,7 +1162,7 @@
*
* png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_GAMMA_MAC);
* In this case the output is assumed to be something like an sRGB conformant
- * display preceeded by a power-law lookup table of power 1.45. This is how
+ * display preceded by a power-law lookup table of power 1.45. This is how
* early Mac systems behaved.
*
* png_set_alpha_mode(pp, PNG_ALPHA_STANDARD, PNG_GAMMA_LINEAR);
@@ -1243,7 +1209,7 @@
*
* When the default gamma of PNG files doesn't match the output gamma.
* If you have PNG files with no gamma information png_set_alpha_mode allows
- * you to provide a default gamma, but it also sets the ouput gamma to the
+ * you to provide a default gamma, but it also sets the output gamma to the
* matching value. If you know your PNG files have a gamma that doesn't
* match the output you can take advantage of the fact that
* png_set_alpha_mode always sets the output gamma but only sets the PNG
@@ -1694,7 +1660,7 @@
* chunk will cause an error at this point unless it is to be saved.
* positive: The chunk was handled, libpng will ignore/discard it.
*
- * See "INTERACTION WTIH USER CHUNK CALLBACKS" below for important notes about
+ * See "INTERACTION WITH USER CHUNK CALLBACKS" below for important notes about
* how this behavior will change in libpng 1.7
*/
PNG_EXPORT(88, void, png_set_read_user_chunk_fn, (png_structrp png_ptr,
@@ -1719,7 +1685,7 @@
/* Function to be called when data becomes available */
PNG_EXPORT(92, void, png_process_data, (png_structrp png_ptr,
- png_inforp info_ptr, png_bytep buffer, png_size_t buffer_size));
+ png_inforp info_ptr, png_bytep buffer, size_t buffer_size));
/* A function which may be called *only* within png_process_data to stop the
* processing of any more data. The function returns the number of bytes
@@ -1728,7 +1694,7 @@
* 'save' is set to true the routine will first save all the pending data and
* will always return 0.
*/
-PNG_EXPORT(219, png_size_t, png_process_data_pause, (png_structrp, int save));
+PNG_EXPORT(219, size_t, png_process_data_pause, (png_structrp, int save));
/* A function which may be called *only* outside (after) a call to
* png_process_data. It returns the number of bytes of data to skip in the
@@ -1792,7 +1758,8 @@
#define PNG_FREE_PLTE 0x1000U
#define PNG_FREE_TRNS 0x2000U
#define PNG_FREE_TEXT 0x4000U
-#define PNG_FREE_ALL 0x7fffU
+#define PNG_FREE_EXIF 0x8000U /* Added at libpng-1.6.31 */
+#define PNG_FREE_ALL 0xffffU
#define PNG_FREE_MUL 0x4220U /* PNG_FREE_SPLT|PNG_FREE_TEXT|PNG_FREE_UNKN */
#ifdef PNG_USER_MEM_SUPPORTED
@@ -1872,7 +1839,7 @@
png_const_inforp info_ptr, png_uint_32 flag));
/* Returns number of bytes needed to hold a transformed row. */
-PNG_EXPORT(111, png_size_t, png_get_rowbytes, (png_const_structrp png_ptr,
+PNG_EXPORT(111, size_t, png_get_rowbytes, (png_const_structrp png_ptr,
png_const_inforp info_ptr));
#ifdef PNG_INFO_IMAGE_SUPPORTED
@@ -2011,6 +1978,18 @@
png_fixed_point int_blue_Z))
#endif
+#ifdef PNG_eXIf_SUPPORTED
+PNG_EXPORT(246, png_uint_32, png_get_eXIf, (png_const_structrp png_ptr,
+ png_inforp info_ptr, png_bytep *exif));
+PNG_EXPORT(247, void, png_set_eXIf, (png_const_structrp png_ptr,
+ png_inforp info_ptr, png_bytep exif));
+
+PNG_EXPORT(248, png_uint_32, png_get_eXIf_1, (png_const_structrp png_ptr,
+ png_const_inforp info_ptr, png_uint_32 *num_exif, png_bytep *exif));
+PNG_EXPORT(249, void, png_set_eXIf_1, (png_const_structrp png_ptr,
+ png_inforp info_ptr, png_uint_32 num_exif, png_bytep exif));
+#endif
+
#ifdef PNG_gAMA_SUPPORTED
PNG_FP_EXPORT(137, png_uint_32, png_get_gAMA, (png_const_structrp png_ptr,
png_const_inforp info_ptr, double *file_gamma))
@@ -2029,9 +2008,6 @@
#ifdef PNG_hIST_SUPPORTED
PNG_EXPORT(141, png_uint_32, png_get_hIST, (png_const_structrp png_ptr,
png_inforp info_ptr, png_uint_16p *hist));
-#endif
-
-#ifdef PNG_hIST_SUPPORTED
PNG_EXPORT(142, void, png_set_hIST, (png_const_structrp png_ptr,
png_inforp info_ptr, png_const_uint_16p hist));
#endif
@@ -2232,7 +2208,7 @@
* to specifying "NEVER", however when "AS_DEFAULT" is used for specific chunks
* it simply resets the behavior to the libpng default.
*
- * INTERACTION WTIH USER CHUNK CALLBACKS:
+ * INTERACTION WITH USER CHUNK CALLBACKS:
* The per-chunk handling is always used when there is a png_user_chunk_ptr
* callback and the callback returns 0; the chunk is then always stored *unless*
* it is critical and the per-chunk setting is other than ALWAYS. Notice that
@@ -2651,7 +2627,7 @@
* The simplified API hides the details of both libpng and the PNG file format
* itself. It allows PNG files to be read into a very limited number of
* in-memory bitmap formats or to be written from the same formats. If these
- * formats do not accomodate your needs then you can, and should, use the more
+ * formats do not accommodate your needs then you can, and should, use the more
* sophisticated APIs above - these support a wide variety of in-memory formats
* and a wide variety of sophisticated transformations to those formats as well
* as a wide variety of APIs to manipulate ancillary information.
@@ -2757,7 +2733,7 @@
*
* When the simplified API needs to convert between sRGB and linear colorspaces,
* the actual sRGB transfer curve defined in the sRGB specification (see the
- * article at http://en.wikipedia.org/wiki/SRGB) is used, not the gamma=1/2.2
+ * article at <https://en.wikipedia.org/wiki/SRGB>) is used, not the gamma=1/2.2
* approximation used elsewhere in libpng.
*
* When an alpha channel is present it is expected to denote pixel coverage
@@ -2812,6 +2788,8 @@
# define PNG_FORMAT_FLAG_AFIRST 0x20U /* alpha channel comes first */
#endif
+#define PNG_FORMAT_FLAG_ASSOCIATED_ALPHA 0x40U /* alpha channel is associated */
+
/* Commonly used formats have predefined macros.
*
* First the single byte (sRGB) formats:
@@ -2958,7 +2936,7 @@
* 'flags' field of png_image.
*/
#define PNG_IMAGE_FLAG_COLORSPACE_NOT_sRGB 0x01
- /* This indicates the the RGB values of the in-memory bitmap do not
+ /* This indicates that the RGB values of the in-memory bitmap do not
* correspond to the red, green and blue end-points defined by sRGB.
*/
@@ -3011,7 +2989,7 @@
#endif /* STDIO */
PNG_EXPORT(236, int, png_image_begin_read_from_memory, (png_imagep image,
- png_const_voidp memory, png_size_t size));
+ png_const_voidp memory, size_t size));
/* The PNG header is read from the given memory buffer. */
PNG_EXPORT(237, int, png_image_finish_read, (png_imagep image,
@@ -3124,7 +3102,7 @@
* than or equal to the original value.
*
* If the function returns false and *memory_bytes was not changed an error
- * occured during write. If *memory_bytes was changed, or is not 0 if
+ * occurred during write. If *memory_bytes was changed, or is not 0 if
* 'memory' was NULL, the write would have succeeded but for the memory
* buffer being too small. *memory_bytes contains the required number of
* bytes and will be bigger that the original value.
@@ -3208,7 +3186,7 @@
* option and 'onoff' is 0 (off) or non-0 (on). The value returned is given
* by the PNG_OPTION_ defines below.
*
- * HARDWARE: normally hardware capabilites, such as the Intel SSE instructions,
+ * HARDWARE: normally hardware capabilities, such as the Intel SSE instructions,
* are detected at run time, however sometimes it may be impossible
* to do this in user mode, in which case it is necessary to discover
* the capabilities in an OS specific way. Such capabilities are
@@ -3226,7 +3204,14 @@
#endif
#define PNG_MAXIMUM_INFLATE_WINDOW 2 /* SOFTWARE: force maximum window */
#define PNG_SKIP_sRGB_CHECK_PROFILE 4 /* SOFTWARE: Check ICC profile for sRGB */
-#define PNG_OPTION_NEXT 6 /* Next option - numbers must be even */
+#ifdef PNG_MIPS_MSA_API_SUPPORTED
+# define PNG_MIPS_MSA 6 /* HARDWARE: MIPS Msa SIMD instructions supported */
+#endif
+#define PNG_IGNORE_ADLER32 8
+#ifdef PNG_POWERPC_VSX_API_SUPPORTED
+# define PNG_POWERPC_VSX 10 /* HARDWARE: PowerPC VSX SIMD instructions supported */
+#endif
+#define PNG_OPTION_NEXT 12 /* Next option - numbers must be even */
/* Return values: NOTE: there are four values and 'off' is *not* zero */
#define PNG_OPTION_UNSET 0 /* Unset - defaults to off */
@@ -3250,7 +3235,7 @@
* one to use is one more than this.)
*/
#ifdef PNG_EXPORT_LAST_ORDINAL
- PNG_EXPORT_LAST_ORDINAL(245);
+ PNG_EXPORT_LAST_ORDINAL(249);
#endif
#ifdef __cplusplus
diff --git a/pngconf.h b/pngconf.h
index 9da691d..927a769 100644
--- a/pngconf.h
+++ b/pngconf.h
@@ -1,11 +1,12 @@
-/* pngconf.h - machine configurable file for libpng
+/* pngconf.h - machine-configurable file for libpng
*
- * libpng version 1.6.24, August 4, 2016
+ * libpng version 1.6.37
*
- * Copyright (c) 1998-2002,2004,2006-2016 Glenn Randers-Pehrson
- * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
- * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
+ * Copyright (c) 2018-2019 Cosmin Truta
+ * Copyright (c) 1998-2002,2004,2006-2016,2018 Glenn Randers-Pehrson
+ * Copyright (c) 1996-1997 Andreas Dilger
+ * Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
@@ -57,14 +58,13 @@
#endif /* PNG_BUILDING_SYMBOL_TABLE */
-/* Prior to 1.6.0 it was possible to turn off 'const' in declarations using
- * PNG_NO_CONST; this is no longer supported except for data declarations which
- * apparently still cause problems in 2011 on some compilers.
+/* Prior to 1.6.0, it was possible to turn off 'const' in declarations,
+ * using PNG_NO_CONST. This is no longer supported.
*/
#define PNG_CONST const /* backward compatibility only */
-/* This controls optimization of the reading of 16-bit and 32-bit values
- * from PNG files. It can be set on a per-app-file basis - it
+/* This controls optimization of the reading of 16-bit and 32-bit
+ * values from PNG files. It can be set on a per-app-file basis: it
* just changes whether a macro is used when the function is called.
* The library builder sets the default; if read functions are not
* built into the library the macro implementation is forced on.
@@ -127,7 +127,7 @@
*
* These cases only differ if the operating system does not use the C
* calling convention, at present this just means the above cases
- * (x86 DOS/Windows sytems) and, even then, this does not apply to
+ * (x86 DOS/Windows systems) and, even then, this does not apply to
* Cygwin running on those systems.
*
* Note that the value must be defined in pnglibconf.h so that what
@@ -507,16 +507,18 @@
# error "libpng requires a signed 32-bit (or more) type"
#endif
-#if UINT_MAX > 4294967294
+#if UINT_MAX > 4294967294U
typedef unsigned int png_uint_32;
-#elif ULONG_MAX > 4294967294
+#elif ULONG_MAX > 4294967294U
typedef unsigned long int png_uint_32;
#else
# error "libpng requires an unsigned 32-bit (or more) type"
#endif
-/* Prior to 1.6.0 it was possible to disable the use of size_t, 1.6.0, however,
- * requires an ISOC90 compiler and relies on consistent behavior of sizeof.
+/* Prior to 1.6.0, it was possible to disable the use of size_t and ptrdiff_t.
+ * From 1.6.0 onwards, an ISO C90 compiler, as well as a standard-compliant
+ * behavior of sizeof and ptrdiff_t are required.
+ * The legacy typedefs are provided here for backwards compatibility.
*/
typedef size_t png_size_t;
typedef ptrdiff_t png_ptrdiff_t;
@@ -537,13 +539,12 @@
# endif
#endif
-/* png_alloc_size_t is guaranteed to be no smaller than png_size_t, and no
- * smaller than png_uint_32. Casts from png_size_t or png_uint_32 to
- * png_alloc_size_t are not necessary; in fact, it is recommended not to use
- * them at all so that the compiler can complain when something turns out to be
- * problematic.
+/* png_alloc_size_t is guaranteed to be no smaller than size_t, and no smaller
+ * than png_uint_32. Casts from size_t or png_uint_32 to png_alloc_size_t are
+ * not necessary; in fact, it is recommended not to use them at all, so that
+ * the compiler can complain when something turns out to be problematic.
*
- * Casts in the other direction (from png_alloc_size_t to png_size_t or
+ * Casts in the other direction (from png_alloc_size_t to size_t or
* png_uint_32) should be explicitly applied; however, we do not expect to
* encounter practical situations that require such conversions.
*
@@ -553,7 +554,7 @@
#ifdef PNG_SMALL_SIZE_T
typedef png_uint_32 png_alloc_size_t;
#else
- typedef png_size_t png_alloc_size_t;
+ typedef size_t png_alloc_size_t;
#endif
/* Prior to 1.6.0 libpng offered limited support for Microsoft C compiler
@@ -589,8 +590,8 @@
typedef const char * png_const_charp;
typedef png_fixed_point * png_fixed_point_p;
typedef const png_fixed_point * png_const_fixed_point_p;
-typedef png_size_t * png_size_tp;
-typedef const png_size_t * png_const_size_tp;
+typedef size_t * png_size_tp;
+typedef const size_t * png_const_size_tp;
#ifdef PNG_STDIO_SUPPORTED
typedef FILE * png_FILE_p;
diff --git a/pngdebug.h b/pngdebug.h
index 15a7ed0..00d5a45 100644
--- a/pngdebug.h
+++ b/pngdebug.h
@@ -1,10 +1,10 @@
/* pngdebug.h - Debugging macros for libpng, also used in pngtest.c
*
- * Last changed in libpng 1.6.8 [December 19, 2013]
+ * Copyright (c) 2018 Cosmin Truta
* Copyright (c) 1998-2002,2004,2006-2013 Glenn Randers-Pehrson
- * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
- * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
+ * Copyright (c) 1996-1997 Andreas Dilger
+ * Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
diff --git a/pngerror.c b/pngerror.c
index f13b764..ec3a709 100644
--- a/pngerror.c
+++ b/pngerror.c
@@ -1,10 +1,10 @@
/* pngerror.c - stub functions for i/o and memory allocation
*
- * Last changed in libpng 1.6.24 [August 4, 2016]
- * Copyright (c) 1998-2002,2004,2006-2016 Glenn Randers-Pehrson
- * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
- * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
+ * Copyright (c) 2018 Cosmin Truta
+ * Copyright (c) 1998-2002,2004,2006-2017 Glenn Randers-Pehrson
+ * Copyright (c) 1996-1997 Andreas Dilger
+ * Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
@@ -163,7 +163,7 @@
case PNG_NUMBER_FORMAT_02u:
/* Expects at least 2 digits. */
mincount = 2;
- /* FALL THROUGH */
+ /* FALLTHROUGH */
case PNG_NUMBER_FORMAT_u:
*--end = digits[number % 10];
@@ -173,7 +173,7 @@
case PNG_NUMBER_FORMAT_02x:
/* This format expects at least two digits */
mincount = 2;
- /* FALL THROUGH */
+ /* FALLTHROUGH */
case PNG_NUMBER_FORMAT_x:
*--end = digits[number & 0xf];
@@ -425,7 +425,7 @@
* if the character is invalid.
*/
#define isnonalpha(c) ((c) < 65 || (c) > 122 || ((c) > 90 && (c) < 97))
-static PNG_CONST char png_digit[16] = {
+static const char png_digit[16] = {
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'A', 'B', 'C', 'D', 'E', 'F'
};
@@ -573,7 +573,7 @@
{
# define fixed_message "fixed point overflow in "
# define fixed_message_ln ((sizeof fixed_message)-1)
- int iin;
+ unsigned int iin;
char msg[fixed_message_ln+PNG_MAX_ERROR_TEXT];
memcpy(msg, fixed_message, fixed_message_ln);
iin = 0;
@@ -885,7 +885,7 @@
png_safe_error),(png_structp png_nonconst_ptr, png_const_charp error_message),
PNG_NORETURN)
{
- const png_const_structrp png_ptr = png_nonconst_ptr;
+ png_const_structrp png_ptr = png_nonconst_ptr;
png_imagep image = png_voidcast(png_imagep, png_ptr->error_ptr);
/* An error is always logged here, overwriting anything (typically a warning)
@@ -920,7 +920,7 @@
void /* PRIVATE */ PNGCBAPI
png_safe_warning(png_structp png_nonconst_ptr, png_const_charp warning_message)
{
- const png_const_structrp png_ptr = png_nonconst_ptr;
+ png_const_structrp png_ptr = png_nonconst_ptr;
png_imagep image = png_voidcast(png_imagep, png_ptr->error_ptr);
/* A warning is only logged if there is no prior warning or error. */
diff --git a/pngget.c b/pngget.c
index b3c6863..5abf1ef 100644
--- a/pngget.c
+++ b/pngget.c
@@ -1,10 +1,10 @@
/* pngget.c - retrieval of values from info struct
*
- * Last changed in libpng 1.6.24 [August 4, 2016]
- * Copyright (c) 1998-2002,2004,2006-2016 Glenn Randers-Pehrson
- * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
- * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
+ * Copyright (c) 2018 Cosmin Truta
+ * Copyright (c) 1998-2002,2004,2006-2018 Glenn Randers-Pehrson
+ * Copyright (c) 1996-1997 Andreas Dilger
+ * Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
@@ -26,7 +26,7 @@
return(0);
}
-png_size_t PNGAPI
+size_t PNGAPI
png_get_rowbytes(png_const_structrp png_ptr, png_const_inforp info_ptr)
{
if (png_ptr != NULL && info_ptr != NULL)
@@ -338,7 +338,7 @@
png_fixed_point result;
if (ppm <= PNG_UINT_31_MAX && png_muldiv(&result, (png_int_32)ppm, 127,
5000) != 0)
- return result;
+ return (png_uint_32)result;
/* Overflow. */
return 0;
@@ -367,7 +367,7 @@
static png_fixed_point
png_fixed_inches_from_microns(png_const_structrp png_ptr, png_int_32 microns)
{
- /* Convert from metres * 1,000,000 to inches * 100,000, meters to
+ /* Convert from meters * 1,000,000 to inches * 100,000, meters to
* inches is simply *(100/2.54), so we want *(10/2.54) == 500/127.
* Notice that this can overflow - a warning is output and 0 is
* returned.
@@ -741,8 +741,7 @@
if (png_ptr != NULL && info_ptr != NULL &&
(info_ptr->valid & PNG_INFO_iCCP) != 0 &&
- name != NULL && compression_type != NULL && profile != NULL &&
- proflen != NULL)
+ name != NULL && profile != NULL && proflen != NULL)
{
*name = info_ptr->iccp_name;
*profile = info_ptr->iccp_profile;
@@ -750,11 +749,13 @@
/* This is somewhat irrelevant since the profile data returned has
* actually been uncompressed.
*/
- *compression_type = PNG_COMPRESSION_TYPE_BASE;
+ if (compression_type != NULL)
+ *compression_type = PNG_COMPRESSION_TYPE_BASE;
return (PNG_INFO_iCCP);
}
return (0);
+
}
#endif
@@ -773,6 +774,35 @@
}
#endif
+#ifdef PNG_eXIf_SUPPORTED
+png_uint_32 PNGAPI
+png_get_eXIf(png_const_structrp png_ptr, png_inforp info_ptr,
+ png_bytep *exif)
+{
+ png_warning(png_ptr, "png_get_eXIf does not work; use png_get_eXIf_1");
+ PNG_UNUSED(info_ptr)
+ PNG_UNUSED(exif)
+ return 0;
+}
+
+png_uint_32 PNGAPI
+png_get_eXIf_1(png_const_structrp png_ptr, png_const_inforp info_ptr,
+ png_uint_32 *num_exif, png_bytep *exif)
+{
+ png_debug1(1, "in %s retrieval function", "eXIf");
+
+ if (png_ptr != NULL && info_ptr != NULL &&
+ (info_ptr->valid & PNG_INFO_eXIf) != 0 && exif != NULL)
+ {
+ *num_exif = info_ptr->num_exif;
+ *exif = info_ptr->exif;
+ return (PNG_INFO_eXIf);
+ }
+
+ return (0);
+}
+#endif
+
#ifdef PNG_hIST_SUPPORTED
png_uint_32 PNGAPI
png_get_hIST(png_const_structrp png_ptr, png_inforp info_ptr,
@@ -1135,7 +1165,7 @@
}
#endif
-png_size_t PNGAPI
+size_t PNGAPI
png_get_compression_buffer_size(png_const_structrp png_ptr)
{
if (png_ptr == NULL)
diff --git a/pnginfo.h b/pnginfo.h
index 361ed8b..1f98ded 100644
--- a/pnginfo.h
+++ b/pnginfo.h
@@ -1,10 +1,10 @@
/* pnginfo.h - header file for PNG reference library
*
- * Last changed in libpng 1.6.1 [March 28, 2013]
- * Copyright (c) 1998-2002,2004,2006-2013 Glenn Randers-Pehrson
- * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
- * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
+ * Copyright (c) 2018 Cosmin Truta
+ * Copyright (c) 1998-2002,2004,2006-2013,2018 Glenn Randers-Pehrson
+ * Copyright (c) 1996-1997 Andreas Dilger
+ * Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
@@ -55,10 +55,10 @@
struct png_info_def
{
/* The following are necessary for every PNG file */
- png_uint_32 width; /* width of image in pixels (from IHDR) */
- png_uint_32 height; /* height of image in pixels (from IHDR) */
- png_uint_32 valid; /* valid chunk data (see PNG_INFO_ below) */
- png_size_t rowbytes; /* bytes needed to hold an untransformed row */
+ png_uint_32 width; /* width of image in pixels (from IHDR) */
+ png_uint_32 height; /* height of image in pixels (from IHDR) */
+ png_uint_32 valid; /* valid chunk data (see PNG_INFO_ below) */
+ size_t rowbytes; /* bytes needed to hold an untransformed row */
png_colorp palette; /* array of color values (valid & PNG_INFO_PLTE) */
png_uint_16 num_palette; /* number of color entries in "palette" (PLTE) */
png_uint_16 num_trans; /* number of transparent palette color (tRNS) */
@@ -185,6 +185,14 @@
png_byte phys_unit_type; /* resolution type (see PNG_RESOLUTION_ below) */
#endif
+#ifdef PNG_eXIf_SUPPORTED
+ int num_exif; /* Added at libpng-1.6.31 */
+ png_bytep exif;
+# ifdef PNG_READ_eXIf_SUPPORTED
+ png_bytep eXIf_buf; /* Added at libpng-1.6.32 */
+# endif
+#endif
+
#ifdef PNG_hIST_SUPPORTED
/* The hIST chunk contains the relative frequency or importance of the
* various palette entries, so that a viewer can intelligently select a
@@ -239,7 +247,7 @@
/* The sCAL chunk describes the actual physical dimensions of the
* subject matter of the graphic. The chunk contains a unit specification
* a byte value, and two ASCII strings representing floating-point
- * values. The values are width and height corresponsing to one pixel
+ * values. The values are width and height corresponding to one pixel
* in the image. Data values are valid if (valid & PNG_INFO_sCAL) is
* non-zero.
*/
diff --git a/pngmem.c b/pngmem.c
index 6033bf2..09ed9c1 100644
--- a/pngmem.c
+++ b/pngmem.c
@@ -1,10 +1,10 @@
/* pngmem.c - stub functions for memory allocation
*
- * Last changed in libpng 1.6.24 [August 4, 2016]
+ * Copyright (c) 2018 Cosmin Truta
* Copyright (c) 1998-2002,2004,2006-2014,2016 Glenn Randers-Pehrson
- * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
- * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
+ * Copyright (c) 1996-1997 Andreas Dilger
+ * Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
@@ -109,7 +109,7 @@
png_malloc_array_checked(png_const_structrp png_ptr, int nelements,
size_t element_size)
{
- png_alloc_size_t req = nelements; /* known to be > 0 */
+ png_alloc_size_t req = (png_alloc_size_t)nelements; /* known to be > 0 */
if (req <= PNG_SIZE_MAX/element_size)
return png_malloc_base(png_ptr, req * element_size);
diff --git a/pngpread.c b/pngpread.c
index 794352f..e283627 100644
--- a/pngpread.c
+++ b/pngpread.c
@@ -1,10 +1,10 @@
/* pngpread.c - read a png file in push mode
*
- * Last changed in libpng 1.6.24 [August 4, 2016]
- * Copyright (c) 1998-2002,2004,2006-2016 Glenn Randers-Pehrson
- * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
- * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
+ * Copyright (c) 2018 Cosmin Truta
+ * Copyright (c) 1998-2002,2004,2006-2018 Glenn Randers-Pehrson
+ * Copyright (c) 1996-1997 Andreas Dilger
+ * Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
@@ -34,7 +34,7 @@
void PNGAPI
png_process_data(png_structrp png_ptr, png_inforp info_ptr,
- png_bytep buffer, png_size_t buffer_size)
+ png_bytep buffer, size_t buffer_size)
{
if (png_ptr == NULL || info_ptr == NULL)
return;
@@ -47,7 +47,7 @@
}
}
-png_size_t PNGAPI
+size_t PNGAPI
png_process_data_pause(png_structrp png_ptr, int save)
{
if (png_ptr != NULL)
@@ -60,7 +60,7 @@
else
{
/* This includes any pending saved bytes: */
- png_size_t remaining = png_ptr->buffer_size;
+ size_t remaining = png_ptr->buffer_size;
png_ptr->buffer_size = 0;
/* So subtract the saved buffer size, unless all the data
@@ -133,8 +133,8 @@
void /* PRIVATE */
png_push_read_sig(png_structrp png_ptr, png_inforp info_ptr)
{
- png_size_t num_checked = png_ptr->sig_bytes, /* SAFE, does not exceed 8 */
- num_to_check = 8 - num_checked;
+ size_t num_checked = png_ptr->sig_bytes; /* SAFE, does not exceed 8 */
+ size_t num_to_check = 8 - num_checked;
if (png_ptr->buffer_size < num_to_check)
{
@@ -189,6 +189,7 @@
png_crc_read(png_ptr, chunk_tag, 4);
png_ptr->chunk_name = PNG_CHUNK_FROM_STRING(chunk_tag);
png_check_chunk_name(png_ptr, png_ptr->chunk_name);
+ png_check_chunk_length(png_ptr, png_ptr->push_length);
png_ptr->mode |= PNG_HAVE_CHUNK_HEADER;
}
@@ -417,7 +418,7 @@
}
void PNGCBAPI
-png_push_fill_buffer(png_structp png_ptr, png_bytep buffer, png_size_t length)
+png_push_fill_buffer(png_structp png_ptr, png_bytep buffer, size_t length)
{
png_bytep ptr;
@@ -427,7 +428,7 @@
ptr = buffer;
if (png_ptr->save_buffer_size != 0)
{
- png_size_t save_size;
+ size_t save_size;
if (length < png_ptr->save_buffer_size)
save_size = length;
@@ -444,7 +445,7 @@
}
if (length != 0 && png_ptr->current_buffer_size != 0)
{
- png_size_t save_size;
+ size_t save_size;
if (length < png_ptr->current_buffer_size)
save_size = length;
@@ -466,7 +467,7 @@
{
if (png_ptr->save_buffer_ptr != png_ptr->save_buffer)
{
- png_size_t i, istop;
+ size_t i, istop;
png_bytep sp;
png_bytep dp;
@@ -481,7 +482,7 @@
if (png_ptr->save_buffer_size + png_ptr->current_buffer_size >
png_ptr->save_buffer_max)
{
- png_size_t new_max;
+ size_t new_max;
png_bytep old_buffer;
if (png_ptr->save_buffer_size > PNG_SIZE_MAX -
@@ -493,7 +494,7 @@
new_max = png_ptr->save_buffer_size + png_ptr->current_buffer_size + 256;
old_buffer = png_ptr->save_buffer;
png_ptr->save_buffer = (png_bytep)png_malloc_warn(png_ptr,
- (png_size_t)new_max);
+ (size_t)new_max);
if (png_ptr->save_buffer == NULL)
{
@@ -521,7 +522,7 @@
void /* PRIVATE */
png_push_restore_buffer(png_structrp png_ptr, png_bytep buffer,
- png_size_t buffer_length)
+ size_t buffer_length)
{
png_ptr->current_buffer = buffer;
png_ptr->current_buffer_size = buffer_length;
@@ -561,7 +562,7 @@
if (png_ptr->idat_size != 0 && png_ptr->save_buffer_size != 0)
{
- png_size_t save_size = png_ptr->save_buffer_size;
+ size_t save_size = png_ptr->save_buffer_size;
png_uint_32 idat_size = png_ptr->idat_size;
/* We want the smaller of 'idat_size' and 'current_buffer_size', but they
@@ -571,7 +572,7 @@
* will break on either 16-bit or 64-bit platforms.
*/
if (idat_size < save_size)
- save_size = (png_size_t)idat_size;
+ save_size = (size_t)idat_size;
else
idat_size = (png_uint_32)save_size;
@@ -588,7 +589,7 @@
if (png_ptr->idat_size != 0 && png_ptr->current_buffer_size != 0)
{
- png_size_t save_size = png_ptr->current_buffer_size;
+ size_t save_size = png_ptr->current_buffer_size;
png_uint_32 idat_size = png_ptr->idat_size;
/* We want the smaller of 'idat_size' and 'current_buffer_size', but they
@@ -597,7 +598,7 @@
* larger - this cannot overflow.
*/
if (idat_size < save_size)
- save_size = (png_size_t)idat_size;
+ save_size = (size_t)idat_size;
else
idat_size = (png_uint_32)save_size;
@@ -624,7 +625,7 @@
void /* PRIVATE */
png_process_IDAT_data(png_structrp png_ptr, png_bytep buffer,
- png_size_t buffer_length)
+ size_t buffer_length)
{
/* The caller checks for a non-zero buffer length. */
if (!(buffer_length > 0) || buffer == NULL)
@@ -684,7 +685,12 @@
png_warning(png_ptr, "Truncated compressed data in IDAT");
else
- png_error(png_ptr, "Decompression error in IDAT");
+ {
+ if (ret == Z_DATA_ERROR)
+ png_benign_error(png_ptr, "IDAT: ADLER32 checksum mismatch");
+ else
+ png_error(png_ptr, "Decompression error in IDAT");
+ }
/* Skip the check on unprocessed input */
return;
@@ -966,20 +972,20 @@
/* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */
/* Start of interlace block */
- static PNG_CONST png_byte png_pass_start[] = {0, 4, 0, 2, 0, 1, 0};
+ static const png_byte png_pass_start[] = {0, 4, 0, 2, 0, 1, 0};
/* Offset to next interlace block */
- static PNG_CONST png_byte png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1};
+ static const png_byte png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1};
/* Start of interlace block in the y direction */
- static PNG_CONST png_byte png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1};
+ static const png_byte png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1};
/* Offset to next interlace block in the y direction */
- static PNG_CONST png_byte png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2};
+ static const png_byte png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2};
/* Height of interlace block. This is not currently used - if you need
* it, uncomment it here and in png.h
- static PNG_CONST png_byte png_pass_height[] = {8, 8, 4, 4, 2, 2, 1};
+ static const png_byte png_pass_height[] = {8, 8, 4, 4, 2, 2, 1};
*/
#endif
diff --git a/pngpriv.h b/pngpriv.h
index 8e54442..88b700d 100644
--- a/pngpriv.h
+++ b/pngpriv.h
@@ -1,10 +1,10 @@
/* pngpriv.h - private declarations for use inside libpng
*
- * Last changed in libpng 1.6.24 [August 4, 2016]
- * Copyright (c) 1998-2002,2004,2006-2016 Glenn Randers-Pehrson
- * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
- * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
+ * Copyright (c) 2018-2019 Cosmin Truta
+ * Copyright (c) 1998-2002,2004,2006-2018 Glenn Randers-Pehrson
+ * Copyright (c) 1996-1997 Andreas Dilger
+ * Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
@@ -35,7 +35,9 @@
* Windows/Visual Studio) there is no effect; the OS specific tests below are
* still required (as of 2011-05-02.)
*/
-#define _POSIX_SOURCE 1 /* Just the POSIX 1003.1 and C89 APIs */
+#ifndef _POSIX_SOURCE
+# define _POSIX_SOURCE 1 /* Just the POSIX 1003.1 and C89 APIs */
+#endif
#ifndef PNG_VERSION_INFO_ONLY
/* Standard library headers not required by png.h: */
@@ -172,7 +174,10 @@
# else /* !defined __ARM_NEON__ */
/* The 'intrinsics' code simply won't compile without this -mfpu=neon:
*/
-# define PNG_ARM_NEON_IMPLEMENTATION 2
+# if !defined(__aarch64__)
+ /* The assembler code currently does not work on ARM64 */
+# define PNG_ARM_NEON_IMPLEMENTATION 2
+# endif /* __aarch64__ */
# endif /* __ARM_NEON__ */
# endif /* !PNG_ARM_NEON_IMPLEMENTATION */
@@ -182,6 +187,22 @@
# endif
#endif /* PNG_ARM_NEON_OPT > 0 */
+#ifndef PNG_MIPS_MSA_OPT
+# if defined(__mips_msa) && (__mips_isa_rev >= 5) && defined(PNG_ALIGNED_MEMORY_SUPPORTED)
+# define PNG_MIPS_MSA_OPT 2
+# else
+# define PNG_MIPS_MSA_OPT 0
+# endif
+#endif
+
+#ifndef PNG_POWERPC_VSX_OPT
+# if defined(__PPC64__) && defined(__ALTIVEC__) && defined(__VSX__)
+# define PNG_POWERPC_VSX_OPT 2
+# else
+# define PNG_POWERPC_VSX_OPT 0
+# endif
+#endif
+
#ifndef PNG_INTEL_SSE_OPT
# ifdef PNG_INTEL_SSE
/* Only check for SSE if the build configuration has been modified to
@@ -192,7 +213,11 @@
defined(__SSE2__) || defined(_M_X64) || defined(_M_AMD64) || \
(defined(_M_IX86_FP) && _M_IX86_FP >= 2)
# define PNG_INTEL_SSE_OPT 1
+# else
+# define PNG_INTEL_SSE_OPT 0
# endif
+# else
+# define PNG_INTEL_SSE_OPT 0
# endif
#endif
@@ -216,8 +241,36 @@
# if PNG_INTEL_SSE_IMPLEMENTATION > 0
# define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_sse2
# endif
+#else
+# define PNG_INTEL_SSE_IMPLEMENTATION 0
#endif
+#if PNG_MIPS_MSA_OPT > 0
+# define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_msa
+# ifndef PNG_MIPS_MSA_IMPLEMENTATION
+# if defined(__mips_msa)
+# if defined(__clang__)
+# elif defined(__GNUC__)
+# if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 7)
+# define PNG_MIPS_MSA_IMPLEMENTATION 2
+# endif /* no GNUC support */
+# endif /* __GNUC__ */
+# else /* !defined __mips_msa */
+# define PNG_MIPS_MSA_IMPLEMENTATION 2
+# endif /* __mips_msa */
+# endif /* !PNG_MIPS_MSA_IMPLEMENTATION */
+
+# ifndef PNG_MIPS_MSA_IMPLEMENTATION
+# define PNG_MIPS_MSA_IMPLEMENTATION 1
+# endif
+#endif /* PNG_MIPS_MSA_OPT > 0 */
+
+#if PNG_POWERPC_VSX_OPT > 0
+# define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_vsx
+# define PNG_POWERPC_VSX_IMPLEMENTATION 1
+#endif
+
+
/* Is this a build of a DLL where compilation of the object modules requires
* different preprocessor settings to those required for a simple library? If
* so PNG_BUILD_DLL must be set.
@@ -410,25 +463,6 @@
# define png_fixed_error(s1,s2) png_err(s1)
#endif
-/* C allows up-casts from (void*) to any pointer and (const void*) to any
- * pointer to a const object. C++ regards this as a type error and requires an
- * explicit, static, cast and provides the static_cast<> rune to ensure that
- * const is not cast away.
- */
-#ifdef __cplusplus
-# define png_voidcast(type, value) static_cast<type>(value)
-# define png_constcast(type, value) const_cast<type>(value)
-# define png_aligncast(type, value) \
- static_cast<type>(static_cast<void*>(value))
-# define png_aligncastconst(type, value) \
- static_cast<type>(static_cast<const void*>(value))
-#else
-# define png_voidcast(type, value) (value)
-# define png_constcast(type, value) ((type)(value))
-# define png_aligncast(type, value) ((void*)(value))
-# define png_aligncastconst(type, value) ((const void*)(value))
-#endif /* __cplusplus */
-
/* Some fixed point APIs are still required even if not exported because
* they get used by the corresponding floating point APIs. This magic
* deals with this:
@@ -443,6 +477,35 @@
/* Other defines specific to compilers can go here. Try to keep
* them inside an appropriate ifdef/endif pair for portability.
*/
+
+/* C allows up-casts from (void*) to any pointer and (const void*) to any
+ * pointer to a const object. C++ regards this as a type error and requires an
+ * explicit, static, cast and provides the static_cast<> rune to ensure that
+ * const is not cast away.
+ */
+#ifdef __cplusplus
+# define png_voidcast(type, value) static_cast<type>(value)
+# define png_constcast(type, value) const_cast<type>(value)
+# define png_aligncast(type, value) \
+ static_cast<type>(static_cast<void*>(value))
+# define png_aligncastconst(type, value) \
+ static_cast<type>(static_cast<const void*>(value))
+#else
+# define png_voidcast(type, value) (value)
+# ifdef _WIN64
+# ifdef __GNUC__
+ typedef unsigned long long png_ptruint;
+# else
+ typedef unsigned __int64 png_ptruint;
+# endif
+# else
+ typedef unsigned long png_ptruint;
+# endif
+# define png_constcast(type, value) ((type)(png_ptruint)(const void*)(value))
+# define png_aligncast(type, value) ((void*)(value))
+# define png_aligncastconst(type, value) ((const void*)(value))
+#endif /* __cplusplus */
+
#if defined(PNG_FLOATING_POINT_SUPPORTED) ||\
defined(PNG_FLOATING_ARITHMETIC_SUPPORTED)
/* png.c requires the following ANSI-C constants if the conversion of
@@ -557,92 +620,92 @@
* are defined in png.h because they need to be visible to applications
* that call png_set_unknown_chunk().
*/
-/* #define PNG_HAVE_IHDR 0x01 (defined in png.h) */
-/* #define PNG_HAVE_PLTE 0x02 (defined in png.h) */
-#define PNG_HAVE_IDAT 0x04
-/* #define PNG_AFTER_IDAT 0x08 (defined in png.h) */
-#define PNG_HAVE_IEND 0x10
- /* 0x20 (unused) */
- /* 0x40 (unused) */
- /* 0x80 (unused) */
-#define PNG_HAVE_CHUNK_HEADER 0x100
-#define PNG_WROTE_tIME 0x200
-#define PNG_WROTE_INFO_BEFORE_PLTE 0x400
-#define PNG_BACKGROUND_IS_GRAY 0x800
-#define PNG_HAVE_PNG_SIGNATURE 0x1000
-#define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */
- /* 0x4000 (unused) */
-#define PNG_IS_READ_STRUCT 0x8000 /* Else is a write struct */
+/* #define PNG_HAVE_IHDR 0x01U (defined in png.h) */
+/* #define PNG_HAVE_PLTE 0x02U (defined in png.h) */
+#define PNG_HAVE_IDAT 0x04U
+/* #define PNG_AFTER_IDAT 0x08U (defined in png.h) */
+#define PNG_HAVE_IEND 0x10U
+ /* 0x20U (unused) */
+ /* 0x40U (unused) */
+ /* 0x80U (unused) */
+#define PNG_HAVE_CHUNK_HEADER 0x100U
+#define PNG_WROTE_tIME 0x200U
+#define PNG_WROTE_INFO_BEFORE_PLTE 0x400U
+#define PNG_BACKGROUND_IS_GRAY 0x800U
+#define PNG_HAVE_PNG_SIGNATURE 0x1000U
+#define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000U /* Have another chunk after IDAT */
+ /* 0x4000U (unused) */
+#define PNG_IS_READ_STRUCT 0x8000U /* Else is a write struct */
/* Flags for the transformations the PNG library does on the image data */
-#define PNG_BGR 0x0001
-#define PNG_INTERLACE 0x0002
-#define PNG_PACK 0x0004
-#define PNG_SHIFT 0x0008
-#define PNG_SWAP_BYTES 0x0010
-#define PNG_INVERT_MONO 0x0020
-#define PNG_QUANTIZE 0x0040
-#define PNG_COMPOSE 0x0080 /* Was PNG_BACKGROUND */
-#define PNG_BACKGROUND_EXPAND 0x0100
-#define PNG_EXPAND_16 0x0200 /* Added to libpng 1.5.2 */
-#define PNG_16_TO_8 0x0400 /* Becomes 'chop' in 1.5.4 */
-#define PNG_RGBA 0x0800
-#define PNG_EXPAND 0x1000
-#define PNG_GAMMA 0x2000
-#define PNG_GRAY_TO_RGB 0x4000
-#define PNG_FILLER 0x8000
-#define PNG_PACKSWAP 0x10000
-#define PNG_SWAP_ALPHA 0x20000
-#define PNG_STRIP_ALPHA 0x40000
-#define PNG_INVERT_ALPHA 0x80000
-#define PNG_USER_TRANSFORM 0x100000
-#define PNG_RGB_TO_GRAY_ERR 0x200000
-#define PNG_RGB_TO_GRAY_WARN 0x400000
-#define PNG_RGB_TO_GRAY 0x600000 /* two bits, RGB_TO_GRAY_ERR|WARN */
-#define PNG_ENCODE_ALPHA 0x800000 /* Added to libpng-1.5.4 */
-#define PNG_ADD_ALPHA 0x1000000 /* Added to libpng-1.2.7 */
-#define PNG_EXPAND_tRNS 0x2000000 /* Added to libpng-1.2.9 */
-#define PNG_SCALE_16_TO_8 0x4000000 /* Added to libpng-1.5.4 */
- /* 0x8000000 unused */
- /* 0x10000000 unused */
- /* 0x20000000 unused */
- /* 0x40000000 unused */
+#define PNG_BGR 0x0001U
+#define PNG_INTERLACE 0x0002U
+#define PNG_PACK 0x0004U
+#define PNG_SHIFT 0x0008U
+#define PNG_SWAP_BYTES 0x0010U
+#define PNG_INVERT_MONO 0x0020U
+#define PNG_QUANTIZE 0x0040U
+#define PNG_COMPOSE 0x0080U /* Was PNG_BACKGROUND */
+#define PNG_BACKGROUND_EXPAND 0x0100U
+#define PNG_EXPAND_16 0x0200U /* Added to libpng 1.5.2 */
+#define PNG_16_TO_8 0x0400U /* Becomes 'chop' in 1.5.4 */
+#define PNG_RGBA 0x0800U
+#define PNG_EXPAND 0x1000U
+#define PNG_GAMMA 0x2000U
+#define PNG_GRAY_TO_RGB 0x4000U
+#define PNG_FILLER 0x8000U
+#define PNG_PACKSWAP 0x10000U
+#define PNG_SWAP_ALPHA 0x20000U
+#define PNG_STRIP_ALPHA 0x40000U
+#define PNG_INVERT_ALPHA 0x80000U
+#define PNG_USER_TRANSFORM 0x100000U
+#define PNG_RGB_TO_GRAY_ERR 0x200000U
+#define PNG_RGB_TO_GRAY_WARN 0x400000U
+#define PNG_RGB_TO_GRAY 0x600000U /* two bits, RGB_TO_GRAY_ERR|WARN */
+#define PNG_ENCODE_ALPHA 0x800000U /* Added to libpng-1.5.4 */
+#define PNG_ADD_ALPHA 0x1000000U /* Added to libpng-1.2.7 */
+#define PNG_EXPAND_tRNS 0x2000000U /* Added to libpng-1.2.9 */
+#define PNG_SCALE_16_TO_8 0x4000000U /* Added to libpng-1.5.4 */
+ /* 0x8000000U unused */
+ /* 0x10000000U unused */
+ /* 0x20000000U unused */
+ /* 0x40000000U unused */
/* Flags for png_create_struct */
-#define PNG_STRUCT_PNG 0x0001
-#define PNG_STRUCT_INFO 0x0002
+#define PNG_STRUCT_PNG 0x0001U
+#define PNG_STRUCT_INFO 0x0002U
/* Flags for the png_ptr->flags rather than declaring a byte for each one */
-#define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001
-#define PNG_FLAG_ZSTREAM_INITIALIZED 0x0002 /* Added to libpng-1.6.0 */
- /* 0x0004 unused */
-#define PNG_FLAG_ZSTREAM_ENDED 0x0008 /* Added to libpng-1.6.0 */
- /* 0x0010 unused */
- /* 0x0020 unused */
-#define PNG_FLAG_ROW_INIT 0x0040
-#define PNG_FLAG_FILLER_AFTER 0x0080
-#define PNG_FLAG_CRC_ANCILLARY_USE 0x0100
-#define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200
-#define PNG_FLAG_CRC_CRITICAL_USE 0x0400
-#define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800
-#define PNG_FLAG_ASSUME_sRGB 0x1000 /* Added to libpng-1.5.4 */
-#define PNG_FLAG_OPTIMIZE_ALPHA 0x2000 /* Added to libpng-1.5.4 */
-#define PNG_FLAG_DETECT_UNINITIALIZED 0x4000 /* Added to libpng-1.5.4 */
-/* #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000 */
-/* #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000 */
-#define PNG_FLAG_LIBRARY_MISMATCH 0x20000
-#define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000
-#define PNG_FLAG_STRIP_ERROR_TEXT 0x80000
-#define PNG_FLAG_BENIGN_ERRORS_WARN 0x100000 /* Added to libpng-1.4.0 */
-#define PNG_FLAG_APP_WARNINGS_WARN 0x200000 /* Added to libpng-1.6.0 */
-#define PNG_FLAG_APP_ERRORS_WARN 0x400000 /* Added to libpng-1.6.0 */
- /* 0x800000 unused */
- /* 0x1000000 unused */
- /* 0x2000000 unused */
- /* 0x4000000 unused */
- /* 0x8000000 unused */
- /* 0x10000000 unused */
- /* 0x20000000 unused */
- /* 0x40000000 unused */
+#define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001U
+#define PNG_FLAG_ZSTREAM_INITIALIZED 0x0002U /* Added to libpng-1.6.0 */
+ /* 0x0004U unused */
+#define PNG_FLAG_ZSTREAM_ENDED 0x0008U /* Added to libpng-1.6.0 */
+ /* 0x0010U unused */
+ /* 0x0020U unused */
+#define PNG_FLAG_ROW_INIT 0x0040U
+#define PNG_FLAG_FILLER_AFTER 0x0080U
+#define PNG_FLAG_CRC_ANCILLARY_USE 0x0100U
+#define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200U
+#define PNG_FLAG_CRC_CRITICAL_USE 0x0400U
+#define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800U
+#define PNG_FLAG_ASSUME_sRGB 0x1000U /* Added to libpng-1.5.4 */
+#define PNG_FLAG_OPTIMIZE_ALPHA 0x2000U /* Added to libpng-1.5.4 */
+#define PNG_FLAG_DETECT_UNINITIALIZED 0x4000U /* Added to libpng-1.5.4 */
+/* #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000U */
+/* #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000U */
+#define PNG_FLAG_LIBRARY_MISMATCH 0x20000U
+#define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000U
+#define PNG_FLAG_STRIP_ERROR_TEXT 0x80000U
+#define PNG_FLAG_BENIGN_ERRORS_WARN 0x100000U /* Added to libpng-1.4.0 */
+#define PNG_FLAG_APP_WARNINGS_WARN 0x200000U /* Added to libpng-1.6.0 */
+#define PNG_FLAG_APP_ERRORS_WARN 0x400000U /* Added to libpng-1.6.0 */
+ /* 0x800000U unused */
+ /* 0x1000000U unused */
+ /* 0x2000000U unused */
+ /* 0x4000000U unused */
+ /* 0x8000000U unused */
+ /* 0x10000000U unused */
+ /* 0x20000000U unused */
+ /* 0x40000000U unused */
#define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \
PNG_FLAG_CRC_ANCILLARY_NOWARN)
@@ -673,8 +736,26 @@
/* Added to libpng-1.2.6 JB */
#define PNG_ROWBYTES(pixel_bits, width) \
((pixel_bits) >= 8 ? \
- ((png_size_t)(width) * (((png_size_t)(pixel_bits)) >> 3)) : \
- (( ((png_size_t)(width) * ((png_size_t)(pixel_bits))) + 7) >> 3) )
+ ((size_t)(width) * (((size_t)(pixel_bits)) >> 3)) : \
+ (( ((size_t)(width) * ((size_t)(pixel_bits))) + 7) >> 3) )
+
+/* This returns the number of trailing bits in the last byte of a row, 0 if the
+ * last byte is completely full of pixels. It is, in principle, (pixel_bits x
+ * width) % 8, but that would overflow for large 'width'. The second macro is
+ * the same except that it returns the number of unused bits in the last byte;
+ * (8-TRAILBITS), but 0 when TRAILBITS is 0.
+ *
+ * NOTE: these macros are intended to be self-evidently correct and never
+ * overflow on the assumption that pixel_bits is in the range 0..255. The
+ * arguments are evaluated only once and they can be signed (e.g. as a result of
+ * the integral promotions). The result of the expression always has type
+ * (png_uint_32), however the compiler always knows it is in the range 0..7.
+ */
+#define PNG_TRAILBITS(pixel_bits, width) \
+ (((pixel_bits) * ((width) % (png_uint_32)8)) % 8)
+
+#define PNG_PADBITS(pixel_bits, width) \
+ ((8 - PNG_TRAILBITS(pixel_bits, width)) % 8)
/* PNG_OUT_OF_RANGE returns true if value is outside the range
* ideal-delta..ideal+delta. Each argument is evaluated twice.
@@ -769,6 +850,7 @@
#define png_PLTE PNG_U32( 80, 76, 84, 69)
#define png_bKGD PNG_U32( 98, 75, 71, 68)
#define png_cHRM PNG_U32( 99, 72, 82, 77)
+#define png_eXIf PNG_U32(101, 88, 73, 102) /* registered July 2017 */
#define png_fRAc PNG_U32(102, 82, 65, 99) /* registered, not defined */
#define png_gAMA PNG_U32(103, 65, 77, 65)
#define png_gIFg PNG_U32(103, 73, 70, 103)
@@ -843,7 +925,7 @@
* PNG files the -I directives must match.
*
* The most likely explanation is that you passed a -I in CFLAGS. This will
- * not work; all the preprocessor directories and in particular all the -I
+ * not work; all the preprocessor directives and in particular all the -I
* directives must be in CPPFLAGS.
*/
#endif
@@ -972,15 +1054,15 @@
*/
PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_read_data,(png_structp png_ptr,
- png_bytep data, png_size_t length),PNG_EMPTY);
+ png_bytep data, size_t length),PNG_EMPTY);
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_push_fill_buffer,(png_structp png_ptr,
- png_bytep buffer, png_size_t length),PNG_EMPTY);
+ png_bytep buffer, size_t length),PNG_EMPTY);
#endif
PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_write_data,(png_structp png_ptr,
- png_bytep data, png_size_t length),PNG_EMPTY);
+ png_bytep data, size_t length),PNG_EMPTY);
#ifdef PNG_WRITE_FLUSH_SUPPORTED
# ifdef PNG_STDIO_SUPPORTED
@@ -994,7 +1076,7 @@
/* Write the "data" buffer to whatever output you are using */
PNG_INTERNAL_FUNCTION(void,png_write_data,(png_structrp png_ptr,
- png_const_bytep data, png_size_t length),PNG_EMPTY);
+ png_const_bytep data, size_t length),PNG_EMPTY);
/* Read and check the PNG file signature */
PNG_INTERNAL_FUNCTION(void,png_read_sig,(png_structrp png_ptr,
@@ -1006,7 +1088,7 @@
/* Read data from whatever input you are using into the "data" buffer */
PNG_INTERNAL_FUNCTION(void,png_read_data,(png_structrp png_ptr, png_bytep data,
- png_size_t length),PNG_EMPTY);
+ size_t length),PNG_EMPTY);
/* Read bytes into buf, and update png_ptr->crc */
PNG_INTERNAL_FUNCTION(void,png_crc_read,(png_structrp png_ptr, png_bytep buf,
@@ -1024,7 +1106,7 @@
* since this is the maximum buffer size we can specify.
*/
PNG_INTERNAL_FUNCTION(void,png_calculate_crc,(png_structrp png_ptr,
- png_const_bytep ptr, png_size_t length),PNG_EMPTY);
+ png_const_bytep ptr, size_t length),PNG_EMPTY);
#ifdef PNG_WRITE_FLUSH_SUPPORTED
PNG_INTERNAL_FUNCTION(void,png_flush,(png_structrp png_ptr),PNG_EMPTY);
@@ -1069,6 +1151,11 @@
int intent),PNG_EMPTY);
#endif
+#ifdef PNG_WRITE_eXIf_SUPPORTED
+PNG_INTERNAL_FUNCTION(void,png_write_eXIf,(png_structrp png_ptr,
+ png_bytep exif, int num_exif),PNG_EMPTY);
+#endif
+
#ifdef PNG_WRITE_iCCP_SUPPORTED
PNG_INTERNAL_FUNCTION(void,png_write_iCCP,(png_structrp png_ptr,
png_const_charp name, png_const_bytep profile), PNG_EMPTY);
@@ -1102,7 +1189,7 @@
/* Chunks that have keywords */
#ifdef PNG_WRITE_tEXt_SUPPORTED
PNG_INTERNAL_FUNCTION(void,png_write_tEXt,(png_structrp png_ptr,
- png_const_charp key, png_const_charp text, png_size_t text_len),PNG_EMPTY);
+ png_const_charp key, png_const_charp text, size_t text_len),PNG_EMPTY);
#endif
#ifdef PNG_WRITE_zTXt_SUPPORTED
@@ -1226,7 +1313,41 @@
PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_neon,(png_row_infop
row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
#endif
-
+
+#if PNG_MIPS_MSA_OPT > 0
+PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_msa,(png_row_infop row_info,
+ png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
+PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_msa,(png_row_infop
+ row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
+PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_msa,(png_row_infop
+ row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
+PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_msa,(png_row_infop
+ row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
+PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_msa,(png_row_infop
+ row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
+PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_msa,(png_row_infop
+ row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
+PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_msa,(png_row_infop
+ row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
+#endif
+
+#if PNG_POWERPC_VSX_OPT > 0
+PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_vsx,(png_row_infop row_info,
+ png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
+PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_vsx,(png_row_infop
+ row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
+PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_vsx,(png_row_infop
+ row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
+PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_vsx,(png_row_infop
+ row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
+PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_vsx,(png_row_infop
+ row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
+PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_vsx,(png_row_infop
+ row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
+PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_vsx,(png_row_infop
+ row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
+#endif
+
#if PNG_INTEL_SSE_IMPLEMENTATION > 0
PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_sse2,(png_row_infop
row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
@@ -1268,7 +1389,7 @@
/* Initialize the row buffers, etc. */
PNG_INTERNAL_FUNCTION(void,png_read_start_row,(png_structrp png_ptr),PNG_EMPTY);
-#if PNG_ZLIB_VERNUM >= 0x1240
+#if ZLIB_VERNUM >= 0x1240
PNG_INTERNAL_FUNCTION(int,png_zlib_inflate,(png_structrp png_ptr, int flush),
PNG_EMPTY);
# define PNG_INFLATE(pp, flush) png_zlib_inflate(pp, flush)
@@ -1334,6 +1455,11 @@
png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
#endif
+#ifdef PNG_READ_eXIf_SUPPORTED
+PNG_INTERNAL_FUNCTION(void,png_handle_eXIf,(png_structrp png_ptr,
+ png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
+#endif
+
#ifdef PNG_READ_gAMA_SUPPORTED
PNG_INTERNAL_FUNCTION(void,png_handle_gAMA,(png_structrp png_ptr,
png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
@@ -1409,9 +1535,12 @@
png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
#endif
-PNG_INTERNAL_FUNCTION(void,png_check_chunk_name,(png_structrp png_ptr,
+PNG_INTERNAL_FUNCTION(void,png_check_chunk_name,(png_const_structrp png_ptr,
png_uint_32 chunk_name),PNG_EMPTY);
+PNG_INTERNAL_FUNCTION(void,png_check_chunk_length,(png_const_structrp png_ptr,
+ png_uint_32 chunk_length),PNG_EMPTY);
+
PNG_INTERNAL_FUNCTION(void,png_handle_unknown,(png_structrp png_ptr,
png_inforp info_ptr, png_uint_32 length, int keep),PNG_EMPTY);
/* This is the function that gets called for unknown chunks. The 'keep'
@@ -1453,10 +1582,10 @@
PNG_INTERNAL_FUNCTION(void,png_push_save_buffer,(png_structrp png_ptr),
PNG_EMPTY);
PNG_INTERNAL_FUNCTION(void,png_push_restore_buffer,(png_structrp png_ptr,
- png_bytep buffer, png_size_t buffer_length),PNG_EMPTY);
+ png_bytep buffer, size_t buffer_length),PNG_EMPTY);
PNG_INTERNAL_FUNCTION(void,png_push_read_IDAT,(png_structrp png_ptr),PNG_EMPTY);
PNG_INTERNAL_FUNCTION(void,png_process_IDAT_data,(png_structrp png_ptr,
- png_bytep buffer, png_size_t buffer_length),PNG_EMPTY);
+ png_bytep buffer, size_t buffer_length),PNG_EMPTY);
PNG_INTERNAL_FUNCTION(void,png_push_process_row,(png_structrp png_ptr),
PNG_EMPTY);
PNG_INTERNAL_FUNCTION(void,png_push_handle_unknown,(png_structrp png_ptr,
@@ -1545,9 +1674,11 @@
/* The 'name' is used for information only */
/* Routines for checking parts of an ICC profile. */
+#ifdef PNG_READ_iCCP_SUPPORTED
PNG_INTERNAL_FUNCTION(int,png_icc_check_length,(png_const_structrp png_ptr,
png_colorspacerp colorspace, png_const_charp name,
png_uint_32 profile_length), PNG_EMPTY);
+#endif /* READ_iCCP */
PNG_INTERNAL_FUNCTION(int,png_icc_check_header,(png_const_structrp png_ptr,
png_colorspacerp colorspace, png_const_charp name,
png_uint_32 profile_length,
@@ -1724,13 +1855,13 @@
#ifdef PNG_FLOATING_POINT_SUPPORTED
PNG_INTERNAL_FUNCTION(void,png_ascii_from_fp,(png_const_structrp png_ptr,
- png_charp ascii, png_size_t size, double fp, unsigned int precision),
+ png_charp ascii, size_t size, double fp, unsigned int precision),
PNG_EMPTY);
#endif /* FLOATING_POINT */
#ifdef PNG_FIXED_POINT_SUPPORTED
PNG_INTERNAL_FUNCTION(void,png_ascii_from_fixed,(png_const_structrp png_ptr,
- png_charp ascii, png_size_t size, png_fixed_point fp),PNG_EMPTY);
+ png_charp ascii, size_t size, png_fixed_point fp),PNG_EMPTY);
#endif /* FIXED_POINT */
#endif /* sCAL */
@@ -1823,7 +1954,7 @@
* the problem character.) This has not been tested within libpng.
*/
PNG_INTERNAL_FUNCTION(int,png_check_fp_number,(png_const_charp string,
- png_size_t size, int *statep, png_size_tp whereami),PNG_EMPTY);
+ size_t size, int *statep, png_size_tp whereami),PNG_EMPTY);
/* This is the same but it checks a complete string and returns true
* only if it just contains a floating point number. As of 1.5.4 this
@@ -1832,7 +1963,7 @@
* for negative or zero values using the sticky flag.
*/
PNG_INTERNAL_FUNCTION(int,png_check_fp_string,(png_const_charp string,
- png_size_t size),PNG_EMPTY);
+ size_t size),PNG_EMPTY);
#endif /* pCAL || sCAL */
#if defined(PNG_GAMMA_SUPPORTED) ||\
@@ -1907,7 +2038,7 @@
png_voidp error_buf; /* Always a jmp_buf at present. */
png_const_bytep memory; /* Memory buffer. */
- png_size_t size; /* Size of the memory buffer. */
+ size_t size; /* Size of the memory buffer. */
unsigned int for_write :1; /* Otherwise it is a read structure */
unsigned int owned_file :1; /* We own the file in io_ptr */
@@ -1969,7 +2100,13 @@
# if PNG_ARM_NEON_OPT > 0
PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_neon,
(png_structp png_ptr, unsigned int bpp), PNG_EMPTY);
-# endif
+#endif
+
+#if PNG_MIPS_MSA_OPT > 0
+PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_msa,
+ (png_structp png_ptr, unsigned int bpp), PNG_EMPTY);
+#endif
+
# if PNG_INTEL_SSE_IMPLEMENTATION > 0
PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_sse2,
(png_structp png_ptr, unsigned int bpp), PNG_EMPTY);
@@ -1979,6 +2116,29 @@
PNG_INTERNAL_FUNCTION(png_uint_32, png_check_keyword, (png_structrp png_ptr,
png_const_charp key, png_bytep new_key), PNG_EMPTY);
+#if PNG_ARM_NEON_IMPLEMENTATION == 1
+PNG_INTERNAL_FUNCTION(void,
+ png_riffle_palette_neon,
+ (png_structrp),
+ PNG_EMPTY);
+PNG_INTERNAL_FUNCTION(int,
+ png_do_expand_palette_rgba8_neon,
+ (png_structrp,
+ png_row_infop,
+ png_const_bytep,
+ const png_bytepp,
+ const png_bytepp),
+ PNG_EMPTY);
+PNG_INTERNAL_FUNCTION(int,
+ png_do_expand_palette_rgb8_neon,
+ (png_structrp,
+ png_row_infop,
+ png_const_bytep,
+ const png_bytepp,
+ const png_bytepp),
+ PNG_EMPTY);
+#endif
+
/* Maintainer: Put new private prototypes here ^ */
#include "pngdebug.h"
diff --git a/pngread.c b/pngread.c
index 1000326..8fa7d9f 100644
--- a/pngread.c
+++ b/pngread.c
@@ -1,10 +1,10 @@
/* pngread.c - read a PNG file
*
- * Last changed in libpng 1.6.24 [August 4, 2016]
- * Copyright (c) 1998-2002,2004,2006-2016 Glenn Randers-Pehrson
- * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
- * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
+ * Copyright (c) 2018-2019 Cosmin Truta
+ * Copyright (c) 1998-2002,2004,2006-2018 Glenn Randers-Pehrson
+ * Copyright (c) 1996-1997 Andreas Dilger
+ * Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
@@ -175,6 +175,11 @@
png_handle_cHRM(png_ptr, info_ptr, length);
#endif
+#ifdef PNG_READ_eXIf_SUPPORTED
+ else if (chunk_name == png_eXIf)
+ png_handle_eXIf(png_ptr, info_ptr, length);
+#endif
+
#ifdef PNG_READ_gAMA_SUPPORTED
else if (chunk_name == png_gAMA)
png_handle_gAMA(png_ptr, info_ptr, length);
@@ -359,9 +364,9 @@
for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel)
{
- png_uint_32 s0 = (*(rp ) << 8) | *(rp + 1);
- png_uint_32 s1 = (*(rp + 2) << 8) | *(rp + 3);
- png_uint_32 s2 = (*(rp + 4) << 8) | *(rp + 5);
+ png_uint_32 s0 = (png_uint_32)(*(rp ) << 8) | *(rp + 1);
+ png_uint_32 s1 = (png_uint_32)(*(rp + 2) << 8) | *(rp + 3);
+ png_uint_32 s2 = (png_uint_32)(*(rp + 4) << 8) | *(rp + 5);
png_uint_32 red = (s0 + s1 + 65536) & 0xffff;
png_uint_32 blue = (s2 + s1 + 65536) & 0xffff;
*(rp ) = (png_byte)((red >> 8) & 0xff);
@@ -534,6 +539,7 @@
png_error(png_ptr, "Invalid attempt to read row data");
/* Fill the row with IDAT data: */
+ png_ptr->row_buf[0]=255; /* to force error if no data was found */
png_read_IDAT_data(png_ptr, png_ptr->row_buf, row_info.rowbytes + 1);
if (png_ptr->row_buf[0] > PNG_FILTER_VALUE_NONE)
@@ -842,6 +848,11 @@
png_handle_cHRM(png_ptr, info_ptr, length);
#endif
+#ifdef PNG_READ_eXIf_SUPPORTED
+ else if (chunk_name == png_eXIf)
+ png_handle_eXIf(png_ptr, info_ptr, length);
+#endif
+
#ifdef PNG_READ_gAMA_SUPPORTED
else if (chunk_name == png_gAMA)
png_handle_gAMA(png_ptr, info_ptr, length);
@@ -983,6 +994,12 @@
png_ptr->chunk_list = NULL;
#endif
+#if defined(PNG_READ_EXPAND_SUPPORTED) && \
+ defined(PNG_ARM_NEON_IMPLEMENTATION)
+ png_free(png_ptr, png_ptr->riffled_palette);
+ png_ptr->riffled_palette = NULL;
+#endif
+
/* NOTE: the 'setjmp' buffer may still be allocated and the memory and error
* callbacks are still set at this point. They are required to complete the
* destruction of the png_struct itself.
@@ -1393,7 +1410,9 @@
png_structrp png_ptr = image->opaque->png_ptr;
png_inforp info_ptr = image->opaque->info_ptr;
+#ifdef PNG_BENIGN_ERRORS_SUPPORTED
png_set_benign_errors(png_ptr, 1/*warn*/);
+#endif
png_read_info(png_ptr, info_ptr);
/* Do this the fast way; just read directly out of png_struct. */
@@ -1431,7 +1450,7 @@
break;
case PNG_COLOR_TYPE_PALETTE:
- cmap_entries = png_ptr->num_palette;
+ cmap_entries = (png_uint_32)png_ptr->num_palette;
break;
default:
@@ -1519,7 +1538,7 @@
#endif /* STDIO */
static void PNGCBAPI
-png_image_memory_read(png_structp png_ptr, png_bytep out, png_size_t need)
+png_image_memory_read(png_structp png_ptr, png_bytep out, size_t need)
{
if (png_ptr != NULL)
{
@@ -1530,7 +1549,7 @@
if (cp != NULL)
{
png_const_bytep memory = cp->memory;
- png_size_t size = cp->size;
+ size_t size = cp->size;
if (memory != NULL && size >= need)
{
@@ -1549,7 +1568,7 @@
}
int PNGAPI png_image_begin_read_from_memory(png_imagep image,
- png_const_voidp memory, png_size_t size)
+ png_const_voidp memory, size_t size)
{
if (image != NULL && image->version == PNG_IMAGE_VERSION)
{
@@ -1608,7 +1627,7 @@
* errors (which are unfortunately quite common.)
*/
{
- static PNG_CONST png_byte chunks_to_process[] = {
+ static const png_byte chunks_to_process[] = {
98, 75, 71, 68, '\0', /* bKGD */
99, 72, 82, 77, '\0', /* cHRM */
103, 65, 77, 65, '\0', /* gAMA */
@@ -1745,9 +1764,9 @@
png_uint_32 alpha, int encoding)
{
png_imagep image = display->image;
- const int output_encoding = (image->format & PNG_FORMAT_FLAG_LINEAR) != 0 ?
+ int output_encoding = (image->format & PNG_FORMAT_FLAG_LINEAR) != 0 ?
P_LINEAR : P_sRGB;
- const int convert_to_Y = (image->format & PNG_FORMAT_FLAG_COLOR) == 0 &&
+ int convert_to_Y = (image->format & PNG_FORMAT_FLAG_COLOR) == 0 &&
(red != green || green != blue);
if (ip > 255)
@@ -1856,13 +1875,13 @@
/* Store the value. */
{
# ifdef PNG_FORMAT_AFIRST_SUPPORTED
- const int afirst = (image->format & PNG_FORMAT_FLAG_AFIRST) != 0 &&
+ int afirst = (image->format & PNG_FORMAT_FLAG_AFIRST) != 0 &&
(image->format & PNG_FORMAT_FLAG_ALPHA) != 0;
# else
# define afirst 0
# endif
# ifdef PNG_FORMAT_BGR_SUPPORTED
- const int bgr = (image->format & PNG_FORMAT_FLAG_BGR) != 0 ? 2 : 0;
+ int bgr = (image->format & PNG_FORMAT_FLAG_BGR) != 0 ? 2 : 0;
# else
# define bgr 0
# endif
@@ -1881,7 +1900,7 @@
{
case 4:
entry[afirst ? 0 : 3] = (png_uint_16)alpha;
- /* FALL THROUGH */
+ /* FALLTHROUGH */
case 3:
if (alpha < 65535)
@@ -1903,7 +1922,7 @@
case 2:
entry[1 ^ afirst] = (png_uint_16)alpha;
- /* FALL THROUGH */
+ /* FALLTHROUGH */
case 1:
if (alpha < 65535)
@@ -1932,6 +1951,7 @@
{
case 4:
entry[afirst ? 0 : 3] = (png_byte)alpha;
+ /* FALLTHROUGH */
case 3:
entry[afirst + (2 ^ bgr)] = (png_byte)blue;
entry[afirst + 1] = (png_byte)green;
@@ -1940,6 +1960,7 @@
case 2:
entry[1 ^ afirst] = (png_byte)alpha;
+ /* FALLTHROUGH */
case 1:
entry[afirst] = (png_byte)green;
break;
@@ -1966,7 +1987,7 @@
for (i=0; i<256; ++i)
png_create_colormap_entry(display, i, i, i, i, 255, P_FILE);
- return i;
+ return (int)i;
}
static int
@@ -1977,7 +1998,7 @@
for (i=0; i<256; ++i)
png_create_colormap_entry(display, i, i, i, i, 255, P_sRGB);
- return i;
+ return (int)i;
}
#define PNG_GRAY_COLORMAP_ENTRIES 256
@@ -2031,7 +2052,7 @@
P_sRGB);
}
- return i;
+ return (int)i;
}
#define PNG_GA_COLORMAP_ENTRIES 256
@@ -2056,7 +2077,7 @@
}
}
- return i;
+ return (int)i;
}
#define PNG_RGB_COLORMAP_ENTRIES 216
@@ -2070,11 +2091,11 @@
{
png_image_read_control *display =
png_voidcast(png_image_read_control*, argument);
- const png_imagep image = display->image;
+ png_imagep image = display->image;
- const png_structrp png_ptr = image->opaque->png_ptr;
- const png_uint_32 output_format = image->format;
- const int output_encoding = (output_format & PNG_FORMAT_FLAG_LINEAR) != 0 ?
+ png_structrp png_ptr = image->opaque->png_ptr;
+ png_uint_32 output_format = image->format;
+ int output_encoding = (output_format & PNG_FORMAT_FLAG_LINEAR) != 0 ?
P_LINEAR : P_sRGB;
unsigned int cmap_entries;
@@ -2249,7 +2270,7 @@
if (PNG_GRAY_COLORMAP_ENTRIES > image->colormap_entries)
png_error(png_ptr, "gray[16] color-map: too few entries");
- cmap_entries = make_gray_colormap(display);
+ cmap_entries = (unsigned int)make_gray_colormap(display);
if (png_ptr->num_trans > 0)
{
@@ -2347,7 +2368,7 @@
if (PNG_GA_COLORMAP_ENTRIES > image->colormap_entries)
png_error(png_ptr, "gray+alpha color-map: too few entries");
- cmap_entries = make_ga_colormap(display);
+ cmap_entries = (unsigned int)make_ga_colormap(display);
background_index = PNG_CMAP_GA_BACKGROUND;
output_processing = PNG_CMAP_GA;
@@ -2381,7 +2402,7 @@
if (PNG_GRAY_COLORMAP_ENTRIES > image->colormap_entries)
png_error(png_ptr, "gray-alpha color-map: too few entries");
- cmap_entries = make_gray_colormap(display);
+ cmap_entries = (unsigned int)make_gray_colormap(display);
if (output_encoding == P_LINEAR)
{
@@ -2520,7 +2541,7 @@
if (PNG_GA_COLORMAP_ENTRIES > image->colormap_entries)
png_error(png_ptr, "rgb[ga] color-map: too few entries");
- cmap_entries = make_ga_colormap(display);
+ cmap_entries = (unsigned int)make_ga_colormap(display);
background_index = PNG_CMAP_GA_BACKGROUND;
output_processing = PNG_CMAP_GA;
}
@@ -2546,12 +2567,12 @@
png_ptr->num_trans > 0) &&
png_gamma_not_sRGB(png_ptr->colorspace.gamma) != 0)
{
- cmap_entries = make_gray_file_colormap(display);
+ cmap_entries = (unsigned int)make_gray_file_colormap(display);
data_encoding = P_FILE;
}
else
- cmap_entries = make_gray_colormap(display);
+ cmap_entries = (unsigned int)make_gray_colormap(display);
/* But if the input has alpha or transparency it must be removed
*/
@@ -2639,7 +2660,7 @@
if (PNG_RGB_COLORMAP_ENTRIES+1+27 > image->colormap_entries)
png_error(png_ptr, "rgb+alpha color-map: too few entries");
- cmap_entries = make_rgb_colormap(display);
+ cmap_entries = (unsigned int)make_rgb_colormap(display);
/* Add a transparent entry. */
png_create_colormap_entry(display, cmap_entries, 255, 255,
@@ -2688,7 +2709,7 @@
if (PNG_RGB_COLORMAP_ENTRIES+1+27 > image->colormap_entries)
png_error(png_ptr, "rgb-alpha color-map: too few entries");
- cmap_entries = make_rgb_colormap(display);
+ cmap_entries = (unsigned int)make_rgb_colormap(display);
png_create_colormap_entry(display, cmap_entries, back_r,
back_g, back_b, 0/*unused*/, output_encoding);
@@ -2773,7 +2794,7 @@
if (PNG_RGB_COLORMAP_ENTRIES > image->colormap_entries)
png_error(png_ptr, "rgb color-map: too few entries");
- cmap_entries = make_rgb_colormap(display);
+ cmap_entries = (unsigned int)make_rgb_colormap(display);
output_processing = PNG_CMAP_RGB;
}
}
@@ -2787,7 +2808,7 @@
unsigned int num_trans = png_ptr->num_trans;
png_const_bytep trans = num_trans > 0 ? png_ptr->trans_alpha : NULL;
png_const_colorp colormap = png_ptr->palette;
- const int do_background = trans != NULL &&
+ int do_background = trans != NULL &&
(output_format & PNG_FORMAT_FLAG_ALPHA) == 0;
unsigned int i;
@@ -2797,11 +2818,11 @@
output_processing = PNG_CMAP_NONE;
data_encoding = P_FILE; /* Don't change from color-map indices */
- cmap_entries = png_ptr->num_palette;
+ cmap_entries = (unsigned int)png_ptr->num_palette;
if (cmap_entries > 256)
cmap_entries = 256;
- if (cmap_entries > image->colormap_entries)
+ if (cmap_entries > (unsigned int)image->colormap_entries)
png_error(png_ptr, "palette color-map: too few entries");
for (i=0; i < cmap_entries; ++i)
@@ -2859,7 +2880,7 @@
case P_sRGB:
/* Change to 8-bit sRGB */
png_set_alpha_mode_fixed(png_ptr, PNG_ALPHA_PNG, PNG_GAMMA_sRGB);
- /* FALL THROUGH */
+ /* FALLTHROUGH */
case P_FILE:
if (png_ptr->bit_depth > 8)
@@ -2913,7 +2934,7 @@
png_error(png_ptr, "bad background index (internal error)");
}
- display->colormap_processing = output_processing;
+ display->colormap_processing = (int)output_processing;
return 1/*ok*/;
}
@@ -3177,8 +3198,7 @@
image->colormap_entries == 244 /* 216 + 1 + 27 */)
break;
- /* goto bad_output; */
- /* FALL THROUGH */
+ goto bad_output;
default:
bad_output:
@@ -3222,14 +3242,14 @@
else
{
- png_alloc_size_t row_bytes = display->row_bytes;
+ png_alloc_size_t row_bytes = (png_alloc_size_t)display->row_bytes;
while (--passes >= 0)
{
png_uint_32 y = image->height;
png_bytep row = png_voidcast(png_bytep, display->first_row);
- while (y-- > 0)
+ for (; y > 0; --y)
{
png_read_row(png_ptr, row, NULL);
row += row_bytes;
@@ -3557,8 +3577,9 @@
* stride which was multiplied by 2 (below) to get row_bytes.
*/
ptrdiff_t step_row = display->row_bytes / 2;
- int preserve_alpha = (image->format & PNG_FORMAT_FLAG_ALPHA) != 0;
- unsigned int outchannels = 1+preserve_alpha;
+ unsigned int preserve_alpha = (image->format &
+ PNG_FORMAT_FLAG_ALPHA) != 0;
+ unsigned int outchannels = 1U+preserve_alpha;
int swap_alpha = 0;
# ifdef PNG_SIMPLIFIED_READ_AFIRST_SUPPORTED
@@ -3744,7 +3765,13 @@
mode = PNG_ALPHA_PNG;
output_gamma = PNG_DEFAULT_sRGB;
}
-
+
+ if ((change & PNG_FORMAT_FLAG_ASSOCIATED_ALPHA) != 0)
+ {
+ mode = PNG_ALPHA_OPTIMIZED;
+ change &= ~PNG_FORMAT_FLAG_ASSOCIATED_ALPHA;
+ }
+
/* If 'do_local_background' is set check for the presence of gamma
* correction; this is part of the work-round for the libpng bug
* described above.
@@ -3925,7 +3952,7 @@
*/
if (linear != 0)
{
- PNG_CONST png_uint_16 le = 0x0001;
+ png_uint_16 le = 0x0001;
if ((*(png_const_bytep) & le) != 0)
png_set_swap(png_ptr);
@@ -3970,6 +3997,10 @@
else if (do_local_compose != 0) /* internal error */
png_error(png_ptr, "png_image_read: alpha channel lost");
+ if ((format & PNG_FORMAT_FLAG_ASSOCIATED_ALPHA) != 0) {
+ info_format |= PNG_FORMAT_FLAG_ASSOCIATED_ALPHA;
+ }
+
if (info_ptr->bit_depth == 16)
info_format |= PNG_FORMAT_FLAG_LINEAR;
@@ -4055,14 +4086,14 @@
else
{
- png_alloc_size_t row_bytes = display->row_bytes;
+ png_alloc_size_t row_bytes = (png_alloc_size_t)display->row_bytes;
while (--passes >= 0)
{
png_uint_32 y = image->height;
png_bytep row = png_voidcast(png_bytep, display->first_row);
- while (y-- > 0)
+ for (; y > 0; --y)
{
png_read_row(png_ptr, row, NULL);
row += row_bytes;
@@ -4083,7 +4114,7 @@
* original PNG format because it may not occur in the output PNG format
* and libpng deals with the issues of reading the original.
*/
- const unsigned int channels = PNG_IMAGE_PIXEL_CHANNELS(image->format);
+ unsigned int channels = PNG_IMAGE_PIXEL_CHANNELS(image->format);
/* The following checks just the 'row_stride' calculation to ensure it
* fits in a signed 32-bit value. Because channels/components can be
@@ -4091,19 +4122,19 @@
* bits; this is just to verify that the 'row_stride' argument can be
* represented.
*/
- if (image->width <= 0x7FFFFFFFU/channels) /* no overflow */
+ if (image->width <= 0x7fffffffU/channels) /* no overflow */
{
png_uint_32 check;
- const png_uint_32 png_row_stride = image->width * channels;
+ png_uint_32 png_row_stride = image->width * channels;
if (row_stride == 0)
row_stride = (png_int_32)/*SAFE*/png_row_stride;
if (row_stride < 0)
- check = -row_stride;
+ check = (png_uint_32)(-row_stride);
else
- check = row_stride;
+ check = (png_uint_32)row_stride;
/* This verifies 'check', the absolute value of the actual stride
* passed in and detects overflow in the application calculation (i.e.
@@ -4125,10 +4156,10 @@
*
* NOTE: this will be changed in 1.7 because PNG_IMAGE_BUFFER_SIZE
* will be changed to use png_alloc_size_t; bigger images can be
- * accomodated on 64-bit systems.
+ * accommodated on 64-bit systems.
*/
if (image->height <=
- 0xFFFFFFFFU/PNG_IMAGE_PIXEL_COMPONENT_SIZE(image->format)/check)
+ 0xffffffffU/PNG_IMAGE_PIXEL_COMPONENT_SIZE(image->format)/check)
{
if ((image->format & PNG_FORMAT_FLAG_COLORMAP) == 0 ||
(image->colormap_entries > 0 && colormap != NULL))
diff --git a/pngrio.c b/pngrio.c
index 7e26e85..7946358 100644
--- a/pngrio.c
+++ b/pngrio.c
@@ -1,10 +1,10 @@
/* pngrio.c - functions for data input
*
- * Last changed in libpng 1.6.24 [August 4, 2016]
- * Copyright (c) 1998-2002,2004,2006-2016 Glenn Randers-Pehrson
- * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
- * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
+ * Copyright (c) 2018 Cosmin Truta
+ * Copyright (c) 1998-2002,2004,2006-2016,2018 Glenn Randers-Pehrson
+ * Copyright (c) 1996-1997 Andreas Dilger
+ * Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
@@ -29,7 +29,7 @@
* to read more than 64K on a 16-bit machine.
*/
void /* PRIVATE */
-png_read_data(png_structrp png_ptr, png_bytep data, png_size_t length)
+png_read_data(png_structrp png_ptr, png_bytep data, size_t length)
{
png_debug1(4, "reading %d bytes", (int)length);
@@ -47,14 +47,14 @@
* than changing the library.
*/
void PNGCBAPI
-png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
+png_default_read_data(png_structp png_ptr, png_bytep data, size_t length)
{
- png_size_t check;
+ size_t check;
if (png_ptr == NULL)
return;
- /* fread() returns 0 on error, so it is OK to store this in a png_size_t
+ /* fread() returns 0 on error, so it is OK to store this in a size_t
* instead of an int, which is what fread() actually returns.
*/
check = fread(data, 1, length, png_voidcast(png_FILE_p, png_ptr->io_ptr));
diff --git a/pngrtran.c b/pngrtran.c
index 748ffb3..9a8fad9 100644
--- a/pngrtran.c
+++ b/pngrtran.c
@@ -1,10 +1,10 @@
/* pngrtran.c - transforms the data in a row for PNG readers
*
- * Last changed in libpng 1.6.24 [August 4, 2016]
- * Copyright (c) 1998-2002,2004,2006-2016 Glenn Randers-Pehrson
- * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
- * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
+ * Copyright (c) 2018-2019 Cosmin Truta
+ * Copyright (c) 1998-2002,2004,2006-2018 Glenn Randers-Pehrson
+ * Copyright (c) 1996-1997 Andreas Dilger
+ * Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
@@ -18,6 +18,17 @@
#include "pngpriv.h"
+#ifdef PNG_ARM_NEON_IMPLEMENTATION
+# if PNG_ARM_NEON_IMPLEMENTATION == 1
+# define PNG_ARM_NEON_INTRINSICS_AVAILABLE
+# if defined(_MSC_VER) && defined(_M_ARM64)
+# include <arm64_neon.h>
+# else
+# include <arm_neon.h>
+# endif
+# endif
+#endif
+
#ifdef PNG_READ_SUPPORTED
/* Set the action on getting a CRC error for an ancillary or critical chunk. */
@@ -49,6 +60,7 @@
case PNG_CRC_WARN_DISCARD: /* Not a valid action for critical data */
png_warning(png_ptr,
"Can't discard critical data on CRC error");
+ /* FALLTHROUGH */
case PNG_CRC_ERROR_QUIT: /* Error/quit */
case PNG_CRC_DEFAULT:
@@ -291,7 +303,7 @@
* who use the inverse of the gamma value accidentally! Since some of these
* values are reasonable this may have to be changed:
*
- * 1.6.x: changed from 0.07..3 to 0.01..100 (to accomodate the optimal 16-bit
+ * 1.6.x: changed from 0.07..3 to 0.01..100 (to accommodate the optimal 16-bit
* gamma of 36, and its reciprocal.)
*/
if (output_gamma < 1000 || output_gamma > 10000000)
@@ -429,7 +441,7 @@
int i;
png_ptr->quantize_index = (png_bytep)png_malloc(png_ptr,
- (png_uint_32)(num_palette * (sizeof (png_byte))));
+ (png_alloc_size_t)((png_uint_32)num_palette * (sizeof (png_byte))));
for (i = 0; i < num_palette; i++)
png_ptr->quantize_index[i] = (png_byte)i;
}
@@ -446,7 +458,7 @@
/* Initialize an array to sort colors */
png_ptr->quantize_sort = (png_bytep)png_malloc(png_ptr,
- (png_uint_32)(num_palette * (sizeof (png_byte))));
+ (png_alloc_size_t)((png_uint_32)num_palette * (sizeof (png_byte))));
/* Initialize the quantize_sort array */
for (i = 0; i < num_palette; i++)
@@ -580,9 +592,11 @@
/* Initialize palette index arrays */
png_ptr->index_to_palette = (png_bytep)png_malloc(png_ptr,
- (png_uint_32)(num_palette * (sizeof (png_byte))));
+ (png_alloc_size_t)((png_uint_32)num_palette *
+ (sizeof (png_byte))));
png_ptr->palette_to_index = (png_bytep)png_malloc(png_ptr,
- (png_uint_32)(num_palette * (sizeof (png_byte))));
+ (png_alloc_size_t)((png_uint_32)num_palette *
+ (sizeof (png_byte))));
/* Initialize the sort array */
for (i = 0; i < num_palette; i++)
@@ -591,7 +605,7 @@
png_ptr->palette_to_index[i] = (png_byte)i;
}
- hash = (png_dsortpp)png_calloc(png_ptr, (png_uint_32)(769 *
+ hash = (png_dsortpp)png_calloc(png_ptr, (png_alloc_size_t)(769 *
(sizeof (png_dsortp))));
num_new_palette = num_palette;
@@ -622,7 +636,7 @@
{
t = (png_dsortp)png_malloc_warn(png_ptr,
- (png_uint_32)(sizeof (png_dsort)));
+ (png_alloc_size_t)(sizeof (png_dsort)));
if (t == NULL)
break;
@@ -744,12 +758,12 @@
int num_red = (1 << PNG_QUANTIZE_RED_BITS);
int num_green = (1 << PNG_QUANTIZE_GREEN_BITS);
int num_blue = (1 << PNG_QUANTIZE_BLUE_BITS);
- png_size_t num_entries = ((png_size_t)1 << total_bits);
+ size_t num_entries = ((size_t)1 << total_bits);
png_ptr->palette_lookup = (png_bytep)png_calloc(png_ptr,
- (png_uint_32)(num_entries * (sizeof (png_byte))));
+ (png_alloc_size_t)(num_entries * (sizeof (png_byte))));
- distance = (png_bytep)png_malloc(png_ptr, (png_uint_32)(num_entries *
+ distance = (png_bytep)png_malloc(png_ptr, (png_alloc_size_t)(num_entries *
(sizeof (png_byte))));
memset(distance, 0xff, num_entries * (sizeof (png_byte)));
@@ -1168,20 +1182,20 @@
png_ptr->palette[png_ptr->background.index].blue;
#ifdef PNG_READ_INVERT_ALPHA_SUPPORTED
- if ((png_ptr->transformations & PNG_INVERT_ALPHA) != 0)
- {
- if ((png_ptr->transformations & PNG_EXPAND_tRNS) == 0)
- {
- /* Invert the alpha channel (in tRNS) unless the pixels are
- * going to be expanded, in which case leave it for later
- */
- int i, istop = png_ptr->num_trans;
+ if ((png_ptr->transformations & PNG_INVERT_ALPHA) != 0)
+ {
+ if ((png_ptr->transformations & PNG_EXPAND_tRNS) == 0)
+ {
+ /* Invert the alpha channel (in tRNS) unless the pixels are
+ * going to be expanded, in which case leave it for later
+ */
+ int i, istop = png_ptr->num_trans;
- for (i=0; i<istop; i++)
- png_ptr->trans_alpha[i] = (png_byte)(255 -
- png_ptr->trans_alpha[i]);
- }
- }
+ for (i = 0; i < istop; i++)
+ png_ptr->trans_alpha[i] =
+ (png_byte)(255 - png_ptr->trans_alpha[i]);
+ }
+ }
#endif /* READ_INVERT_ALPHA */
}
} /* background expand and (therefore) no alpha association. */
@@ -1253,7 +1267,7 @@
default:
case 8:
- /* FALL THROUGH (Already 8 bits) */
+ /* FALLTHROUGH */ /* (Already 8 bits) */
case 16:
/* Already a full 16 bits */
@@ -1314,7 +1328,7 @@
else if (png_ptr->screen_gamma != 0)
/* The converse - assume the file matches the screen, note that this
- * perhaps undesireable default can (from 1.5.4) be changed by calling
+ * perhaps undesirable default can (from 1.5.4) be changed by calling
* png_set_alpha_mode (even if the alpha handling mode isn't required
* or isn't changed from the default.)
*/
@@ -1882,7 +1896,7 @@
png_ptr->transformations &= ~PNG_SHIFT;
- /* significant bits can be in the range 1 to 7 for a meaninful result, if
+ /* significant bits can be in the range 1 to 7 for a meaningful result, if
* the number of significant bits is 0 then no shift is done (this is an
* error condition which is silently ignored.)
*/
@@ -2148,9 +2162,9 @@
{
case 1:
{
- png_bytep sp = row + (png_size_t)((row_width - 1) >> 3);
- png_bytep dp = row + (png_size_t)row_width - 1;
- png_uint_32 shift = 7 - (int)((row_width + 7) & 0x07);
+ png_bytep sp = row + (size_t)((row_width - 1) >> 3);
+ png_bytep dp = row + (size_t)row_width - 1;
+ png_uint_32 shift = 7U - ((row_width + 7U) & 0x07);
for (i = 0; i < row_width; i++)
{
*dp = (png_byte)((*sp >> shift) & 0x01);
@@ -2172,9 +2186,9 @@
case 2:
{
- png_bytep sp = row + (png_size_t)((row_width - 1) >> 2);
- png_bytep dp = row + (png_size_t)row_width - 1;
- png_uint_32 shift = (int)((3 - ((row_width + 3) & 0x03)) << 1);
+ png_bytep sp = row + (size_t)((row_width - 1) >> 2);
+ png_bytep dp = row + (size_t)row_width - 1;
+ png_uint_32 shift = ((3U - ((row_width + 3U) & 0x03)) << 1);
for (i = 0; i < row_width; i++)
{
*dp = (png_byte)((*sp >> shift) & 0x03);
@@ -2195,9 +2209,9 @@
case 4:
{
- png_bytep sp = row + (png_size_t)((row_width - 1) >> 1);
- png_bytep dp = row + (png_size_t)row_width - 1;
- png_uint_32 shift = (int)((1 - ((row_width + 1) & 0x01)) << 2);
+ png_bytep sp = row + (size_t)((row_width - 1) >> 1);
+ png_bytep dp = row + (size_t)row_width - 1;
+ png_uint_32 shift = ((1U - ((row_width + 1U) & 0x01)) << 2);
for (i = 0; i < row_width; i++)
{
*dp = (png_byte)((*sp >> shift) & 0x0f);
@@ -2460,95 +2474,94 @@
static void
png_do_read_swap_alpha(png_row_infop row_info, png_bytep row)
{
+ png_uint_32 row_width = row_info->width;
+
png_debug(1, "in png_do_read_swap_alpha");
+ if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
{
- png_uint_32 row_width = row_info->width;
- if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
+ /* This converts from RGBA to ARGB */
+ if (row_info->bit_depth == 8)
{
- /* This converts from RGBA to ARGB */
- if (row_info->bit_depth == 8)
+ png_bytep sp = row + row_info->rowbytes;
+ png_bytep dp = sp;
+ png_byte save;
+ png_uint_32 i;
+
+ for (i = 0; i < row_width; i++)
{
- png_bytep sp = row + row_info->rowbytes;
- png_bytep dp = sp;
- png_byte save;
- png_uint_32 i;
-
- for (i = 0; i < row_width; i++)
- {
- save = *(--sp);
- *(--dp) = *(--sp);
- *(--dp) = *(--sp);
- *(--dp) = *(--sp);
- *(--dp) = save;
- }
+ save = *(--sp);
+ *(--dp) = *(--sp);
+ *(--dp) = *(--sp);
+ *(--dp) = *(--sp);
+ *(--dp) = save;
}
-
-#ifdef PNG_READ_16BIT_SUPPORTED
- /* This converts from RRGGBBAA to AARRGGBB */
- else
- {
- png_bytep sp = row + row_info->rowbytes;
- png_bytep dp = sp;
- png_byte save[2];
- png_uint_32 i;
-
- for (i = 0; i < row_width; i++)
- {
- save[0] = *(--sp);
- save[1] = *(--sp);
- *(--dp) = *(--sp);
- *(--dp) = *(--sp);
- *(--dp) = *(--sp);
- *(--dp) = *(--sp);
- *(--dp) = *(--sp);
- *(--dp) = *(--sp);
- *(--dp) = save[0];
- *(--dp) = save[1];
- }
- }
-#endif
}
- else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
+#ifdef PNG_READ_16BIT_SUPPORTED
+ /* This converts from RRGGBBAA to AARRGGBB */
+ else
{
- /* This converts from GA to AG */
- if (row_info->bit_depth == 8)
- {
- png_bytep sp = row + row_info->rowbytes;
- png_bytep dp = sp;
- png_byte save;
- png_uint_32 i;
+ png_bytep sp = row + row_info->rowbytes;
+ png_bytep dp = sp;
+ png_byte save[2];
+ png_uint_32 i;
- for (i = 0; i < row_width; i++)
- {
- save = *(--sp);
- *(--dp) = *(--sp);
- *(--dp) = save;
- }
+ for (i = 0; i < row_width; i++)
+ {
+ save[0] = *(--sp);
+ save[1] = *(--sp);
+ *(--dp) = *(--sp);
+ *(--dp) = *(--sp);
+ *(--dp) = *(--sp);
+ *(--dp) = *(--sp);
+ *(--dp) = *(--sp);
+ *(--dp) = *(--sp);
+ *(--dp) = save[0];
+ *(--dp) = save[1];
}
+ }
+#endif
+ }
+
+ else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
+ {
+ /* This converts from GA to AG */
+ if (row_info->bit_depth == 8)
+ {
+ png_bytep sp = row + row_info->rowbytes;
+ png_bytep dp = sp;
+ png_byte save;
+ png_uint_32 i;
+
+ for (i = 0; i < row_width; i++)
+ {
+ save = *(--sp);
+ *(--dp) = *(--sp);
+ *(--dp) = save;
+ }
+ }
#ifdef PNG_READ_16BIT_SUPPORTED
- /* This converts from GGAA to AAGG */
- else
- {
- png_bytep sp = row + row_info->rowbytes;
- png_bytep dp = sp;
- png_byte save[2];
- png_uint_32 i;
+ /* This converts from GGAA to AAGG */
+ else
+ {
+ png_bytep sp = row + row_info->rowbytes;
+ png_bytep dp = sp;
+ png_byte save[2];
+ png_uint_32 i;
- for (i = 0; i < row_width; i++)
- {
- save[0] = *(--sp);
- save[1] = *(--sp);
- *(--dp) = *(--sp);
- *(--dp) = *(--sp);
- *(--dp) = save[0];
- *(--dp) = save[1];
- }
+ for (i = 0; i < row_width; i++)
+ {
+ save[0] = *(--sp);
+ save[1] = *(--sp);
+ *(--dp) = *(--sp);
+ *(--dp) = *(--sp);
+ *(--dp) = save[0];
+ *(--dp) = save[1];
}
-#endif
}
+#endif
}
}
#endif
@@ -2678,8 +2691,8 @@
if ((flags & PNG_FLAG_FILLER_AFTER) != 0)
{
/* This changes the data from G to GX */
- png_bytep sp = row + (png_size_t)row_width;
- png_bytep dp = sp + (png_size_t)row_width;
+ png_bytep sp = row + (size_t)row_width;
+ png_bytep dp = sp + (size_t)row_width;
for (i = 1; i < row_width; i++)
{
*(--dp) = lo_filler;
@@ -2694,8 +2707,8 @@
else
{
/* This changes the data from G to XG */
- png_bytep sp = row + (png_size_t)row_width;
- png_bytep dp = sp + (png_size_t)row_width;
+ png_bytep sp = row + (size_t)row_width;
+ png_bytep dp = sp + (size_t)row_width;
for (i = 0; i < row_width; i++)
{
*(--dp) = *(--sp);
@@ -2713,8 +2726,8 @@
if ((flags & PNG_FLAG_FILLER_AFTER) != 0)
{
/* This changes the data from GG to GGXX */
- png_bytep sp = row + (png_size_t)row_width * 2;
- png_bytep dp = sp + (png_size_t)row_width * 2;
+ png_bytep sp = row + (size_t)row_width * 2;
+ png_bytep dp = sp + (size_t)row_width * 2;
for (i = 1; i < row_width; i++)
{
*(--dp) = lo_filler;
@@ -2732,8 +2745,8 @@
else
{
/* This changes the data from GG to XXGG */
- png_bytep sp = row + (png_size_t)row_width * 2;
- png_bytep dp = sp + (png_size_t)row_width * 2;
+ png_bytep sp = row + (size_t)row_width * 2;
+ png_bytep dp = sp + (size_t)row_width * 2;
for (i = 0; i < row_width; i++)
{
*(--dp) = *(--sp);
@@ -2755,8 +2768,8 @@
if ((flags & PNG_FLAG_FILLER_AFTER) != 0)
{
/* This changes the data from RGB to RGBX */
- png_bytep sp = row + (png_size_t)row_width * 3;
- png_bytep dp = sp + (png_size_t)row_width;
+ png_bytep sp = row + (size_t)row_width * 3;
+ png_bytep dp = sp + (size_t)row_width;
for (i = 1; i < row_width; i++)
{
*(--dp) = lo_filler;
@@ -2773,8 +2786,8 @@
else
{
/* This changes the data from RGB to XRGB */
- png_bytep sp = row + (png_size_t)row_width * 3;
- png_bytep dp = sp + (png_size_t)row_width;
+ png_bytep sp = row + (size_t)row_width * 3;
+ png_bytep dp = sp + (size_t)row_width;
for (i = 0; i < row_width; i++)
{
*(--dp) = *(--sp);
@@ -2794,8 +2807,8 @@
if ((flags & PNG_FLAG_FILLER_AFTER) != 0)
{
/* This changes the data from RRGGBB to RRGGBBXX */
- png_bytep sp = row + (png_size_t)row_width * 6;
- png_bytep dp = sp + (png_size_t)row_width * 2;
+ png_bytep sp = row + (size_t)row_width * 6;
+ png_bytep dp = sp + (size_t)row_width * 2;
for (i = 1; i < row_width; i++)
{
*(--dp) = lo_filler;
@@ -2817,8 +2830,8 @@
else
{
/* This changes the data from RRGGBB to XXRRGGBB */
- png_bytep sp = row + (png_size_t)row_width * 6;
- png_bytep dp = sp + (png_size_t)row_width * 2;
+ png_bytep sp = row + (size_t)row_width * 6;
+ png_bytep dp = sp + (size_t)row_width * 2;
for (i = 0; i < row_width; i++)
{
*(--dp) = *(--sp);
@@ -2859,8 +2872,8 @@
if (row_info->bit_depth == 8)
{
/* This changes G to RGB */
- png_bytep sp = row + (png_size_t)row_width - 1;
- png_bytep dp = sp + (png_size_t)row_width * 2;
+ png_bytep sp = row + (size_t)row_width - 1;
+ png_bytep dp = sp + (size_t)row_width * 2;
for (i = 0; i < row_width; i++)
{
*(dp--) = *sp;
@@ -2872,8 +2885,8 @@
else
{
/* This changes GG to RRGGBB */
- png_bytep sp = row + (png_size_t)row_width * 2 - 1;
- png_bytep dp = sp + (png_size_t)row_width * 4;
+ png_bytep sp = row + (size_t)row_width * 2 - 1;
+ png_bytep dp = sp + (size_t)row_width * 4;
for (i = 0; i < row_width; i++)
{
*(dp--) = *sp;
@@ -2891,8 +2904,8 @@
if (row_info->bit_depth == 8)
{
/* This changes GA to RGBA */
- png_bytep sp = row + (png_size_t)row_width * 2 - 1;
- png_bytep dp = sp + (png_size_t)row_width * 2;
+ png_bytep sp = row + (size_t)row_width * 2 - 1;
+ png_bytep dp = sp + (size_t)row_width * 2;
for (i = 0; i < row_width; i++)
{
*(dp--) = *(sp--);
@@ -2905,8 +2918,8 @@
else
{
/* This changes GGAA to RRGGBBAA */
- png_bytep sp = row + (png_size_t)row_width * 4 - 1;
- png_bytep dp = sp + (png_size_t)row_width * 4;
+ png_bytep sp = row + (size_t)row_width * 4 - 1;
+ png_bytep dp = sp + (size_t)row_width * 4;
for (i = 0; i < row_width; i++)
{
*(dp--) = *(sp--);
@@ -2934,7 +2947,7 @@
* using the equation given in Poynton's ColorFAQ of 1998-01-04 at
* <http://www.inforamp.net/~poynton/> (THIS LINK IS DEAD June 2008 but
* versions dated 1998 through November 2002 have been archived at
- * http://web.archive.org/web/20000816232553/http://www.inforamp.net/
+ * https://web.archive.org/web/20000816232553/www.inforamp.net/
* ~poynton/notes/colour_and_gamma/ColorFAQ.txt )
* Charles Poynton poynton at poynton.com
*
@@ -2977,14 +2990,13 @@
* values this results in an implicit assumption that the original PNG RGB
* values were linear.
*
- * Other integer coefficents can be used via png_set_rgb_to_gray(). Because
+ * Other integer coefficients can be used via png_set_rgb_to_gray(). Because
* the API takes just red and green coefficients the blue coefficient is
* calculated to make the sum 32768. This will result in different rounding
* to that used above.
*/
static int
png_do_rgb_to_gray(png_structrp png_ptr, png_row_infop row_info, png_bytep row)
-
{
int rgb_error = 0;
@@ -2993,12 +3005,11 @@
if ((row_info->color_type & PNG_COLOR_MASK_PALETTE) == 0 &&
(row_info->color_type & PNG_COLOR_MASK_COLOR) != 0)
{
- PNG_CONST png_uint_32 rc = png_ptr->rgb_to_gray_red_coeff;
- PNG_CONST png_uint_32 gc = png_ptr->rgb_to_gray_green_coeff;
- PNG_CONST png_uint_32 bc = 32768 - rc - gc;
- PNG_CONST png_uint_32 row_width = row_info->width;
- PNG_CONST int have_alpha =
- (row_info->color_type & PNG_COLOR_MASK_ALPHA) != 0;
+ png_uint_32 rc = png_ptr->rgb_to_gray_red_coeff;
+ png_uint_32 gc = png_ptr->rgb_to_gray_green_coeff;
+ png_uint_32 bc = 32768 - rc - gc;
+ png_uint_32 row_width = row_info->width;
+ int have_alpha = (row_info->color_type & PNG_COLOR_MASK_ALPHA) != 0;
if (row_info->bit_depth == 8)
{
@@ -3206,414 +3217,229 @@
png_debug(1, "in png_do_compose");
+ switch (row_info->color_type)
{
- switch (row_info->color_type)
+ case PNG_COLOR_TYPE_GRAY:
{
- case PNG_COLOR_TYPE_GRAY:
+ switch (row_info->bit_depth)
{
- switch (row_info->bit_depth)
+ case 1:
{
- case 1:
+ sp = row;
+ shift = 7;
+ for (i = 0; i < row_width; i++)
{
- sp = row;
- shift = 7;
- for (i = 0; i < row_width; i++)
+ if ((png_uint_16)((*sp >> shift) & 0x01)
+ == png_ptr->trans_color.gray)
{
- if ((png_uint_16)((*sp >> shift) & 0x01)
- == png_ptr->trans_color.gray)
- {
- unsigned int tmp = *sp & (0x7f7f >> (7 - shift));
- tmp |= png_ptr->background.gray << shift;
- *sp = (png_byte)(tmp & 0xff);
- }
-
- if (shift == 0)
- {
- shift = 7;
- sp++;
- }
-
- else
- shift--;
+ unsigned int tmp = *sp & (0x7f7f >> (7 - shift));
+ tmp |=
+ (unsigned int)(png_ptr->background.gray << shift);
+ *sp = (png_byte)(tmp & 0xff);
}
- break;
- }
- case 2:
- {
-#ifdef PNG_READ_GAMMA_SUPPORTED
- if (gamma_table != NULL)
+ if (shift == 0)
{
- sp = row;
- shift = 6;
- for (i = 0; i < row_width; i++)
- {
- if ((png_uint_16)((*sp >> shift) & 0x03)
- == png_ptr->trans_color.gray)
- {
- unsigned int tmp = *sp & (0x3f3f >> (6 - shift));
- tmp |= png_ptr->background.gray << shift;
- *sp = (png_byte)(tmp & 0xff);
- }
-
- else
- {
- unsigned int p = (*sp >> shift) & 0x03;
- unsigned int g = (gamma_table [p | (p << 2) |
- (p << 4) | (p << 6)] >> 6) & 0x03;
- unsigned int tmp = *sp & (0x3f3f >> (6 - shift));
- tmp |= g << shift;
- *sp = (png_byte)(tmp & 0xff);
- }
-
- if (shift == 0)
- {
- shift = 6;
- sp++;
- }
-
- else
- shift -= 2;
- }
+ shift = 7;
+ sp++;
}
else
-#endif
- {
- sp = row;
- shift = 6;
- for (i = 0; i < row_width; i++)
- {
- if ((png_uint_16)((*sp >> shift) & 0x03)
- == png_ptr->trans_color.gray)
- {
- unsigned int tmp = *sp & (0x3f3f >> (6 - shift));
- tmp |= png_ptr->background.gray << shift;
- *sp = (png_byte)(tmp & 0xff);
- }
-
- if (shift == 0)
- {
- shift = 6;
- sp++;
- }
-
- else
- shift -= 2;
- }
- }
- break;
+ shift--;
}
-
- case 4:
- {
-#ifdef PNG_READ_GAMMA_SUPPORTED
- if (gamma_table != NULL)
- {
- sp = row;
- shift = 4;
- for (i = 0; i < row_width; i++)
- {
- if ((png_uint_16)((*sp >> shift) & 0x0f)
- == png_ptr->trans_color.gray)
- {
- unsigned int tmp = *sp & (0x0f0f >> (4 - shift));
- tmp |= png_ptr->background.gray << shift;
- *sp = (png_byte)(tmp & 0xff);
- }
-
- else
- {
- unsigned int p = (*sp >> shift) & 0x0f;
- unsigned int g = (gamma_table[p | (p << 4)] >> 4) &
- 0x0f;
- unsigned int tmp = *sp & (0x0f0f >> (4 - shift));
- tmp |= g << shift;
- *sp = (png_byte)(tmp & 0xff);
- }
-
- if (shift == 0)
- {
- shift = 4;
- sp++;
- }
-
- else
- shift -= 4;
- }
- }
-
- else
-#endif
- {
- sp = row;
- shift = 4;
- for (i = 0; i < row_width; i++)
- {
- if ((png_uint_16)((*sp >> shift) & 0x0f)
- == png_ptr->trans_color.gray)
- {
- unsigned int tmp = *sp & (0x0f0f >> (4 - shift));
- tmp |= png_ptr->background.gray << shift;
- *sp = (png_byte)(tmp & 0xff);
- }
-
- if (shift == 0)
- {
- shift = 4;
- sp++;
- }
-
- else
- shift -= 4;
- }
- }
- break;
- }
-
- case 8:
- {
-#ifdef PNG_READ_GAMMA_SUPPORTED
- if (gamma_table != NULL)
- {
- sp = row;
- for (i = 0; i < row_width; i++, sp++)
- {
- if (*sp == png_ptr->trans_color.gray)
- *sp = (png_byte)png_ptr->background.gray;
-
- else
- *sp = gamma_table[*sp];
- }
- }
- else
-#endif
- {
- sp = row;
- for (i = 0; i < row_width; i++, sp++)
- {
- if (*sp == png_ptr->trans_color.gray)
- *sp = (png_byte)png_ptr->background.gray;
- }
- }
- break;
- }
-
- case 16:
- {
-#ifdef PNG_READ_GAMMA_SUPPORTED
- if (gamma_16 != NULL)
- {
- sp = row;
- for (i = 0; i < row_width; i++, sp += 2)
- {
- png_uint_16 v;
-
- v = (png_uint_16)(((*sp) << 8) + *(sp + 1));
-
- if (v == png_ptr->trans_color.gray)
- {
- /* Background is already in screen gamma */
- *sp = (png_byte)((png_ptr->background.gray >> 8)
- & 0xff);
- *(sp + 1) = (png_byte)(png_ptr->background.gray
- & 0xff);
- }
-
- else
- {
- v = gamma_16[*(sp + 1) >> gamma_shift][*sp];
- *sp = (png_byte)((v >> 8) & 0xff);
- *(sp + 1) = (png_byte)(v & 0xff);
- }
- }
- }
- else
-#endif
- {
- sp = row;
- for (i = 0; i < row_width; i++, sp += 2)
- {
- png_uint_16 v;
-
- v = (png_uint_16)(((*sp) << 8) + *(sp + 1));
-
- if (v == png_ptr->trans_color.gray)
- {
- *sp = (png_byte)((png_ptr->background.gray >> 8)
- & 0xff);
- *(sp + 1) = (png_byte)(png_ptr->background.gray
- & 0xff);
- }
- }
- }
- break;
- }
-
- default:
- break;
+ break;
}
- break;
- }
- case PNG_COLOR_TYPE_RGB:
- {
- if (row_info->bit_depth == 8)
+ case 2:
{
#ifdef PNG_READ_GAMMA_SUPPORTED
if (gamma_table != NULL)
{
sp = row;
- for (i = 0; i < row_width; i++, sp += 3)
+ shift = 6;
+ for (i = 0; i < row_width; i++)
{
- if (*sp == png_ptr->trans_color.red &&
- *(sp + 1) == png_ptr->trans_color.green &&
- *(sp + 2) == png_ptr->trans_color.blue)
+ if ((png_uint_16)((*sp >> shift) & 0x03)
+ == png_ptr->trans_color.gray)
{
- *sp = (png_byte)png_ptr->background.red;
- *(sp + 1) = (png_byte)png_ptr->background.green;
- *(sp + 2) = (png_byte)png_ptr->background.blue;
+ unsigned int tmp = *sp & (0x3f3f >> (6 - shift));
+ tmp |=
+ (unsigned int)png_ptr->background.gray << shift;
+ *sp = (png_byte)(tmp & 0xff);
}
else
{
- *sp = gamma_table[*sp];
- *(sp + 1) = gamma_table[*(sp + 1)];
- *(sp + 2) = gamma_table[*(sp + 2)];
+ unsigned int p = (*sp >> shift) & 0x03;
+ unsigned int g = (gamma_table [p | (p << 2) |
+ (p << 4) | (p << 6)] >> 6) & 0x03;
+ unsigned int tmp = *sp & (0x3f3f >> (6 - shift));
+ tmp |= (unsigned int)(g << shift);
+ *sp = (png_byte)(tmp & 0xff);
}
+
+ if (shift == 0)
+ {
+ shift = 6;
+ sp++;
+ }
+
+ else
+ shift -= 2;
+ }
+ }
+
+ else
+#endif
+ {
+ sp = row;
+ shift = 6;
+ for (i = 0; i < row_width; i++)
+ {
+ if ((png_uint_16)((*sp >> shift) & 0x03)
+ == png_ptr->trans_color.gray)
+ {
+ unsigned int tmp = *sp & (0x3f3f >> (6 - shift));
+ tmp |=
+ (unsigned int)png_ptr->background.gray << shift;
+ *sp = (png_byte)(tmp & 0xff);
+ }
+
+ if (shift == 0)
+ {
+ shift = 6;
+ sp++;
+ }
+
+ else
+ shift -= 2;
+ }
+ }
+ break;
+ }
+
+ case 4:
+ {
+#ifdef PNG_READ_GAMMA_SUPPORTED
+ if (gamma_table != NULL)
+ {
+ sp = row;
+ shift = 4;
+ for (i = 0; i < row_width; i++)
+ {
+ if ((png_uint_16)((*sp >> shift) & 0x0f)
+ == png_ptr->trans_color.gray)
+ {
+ unsigned int tmp = *sp & (0x0f0f >> (4 - shift));
+ tmp |=
+ (unsigned int)(png_ptr->background.gray << shift);
+ *sp = (png_byte)(tmp & 0xff);
+ }
+
+ else
+ {
+ unsigned int p = (*sp >> shift) & 0x0f;
+ unsigned int g = (gamma_table[p | (p << 4)] >> 4) &
+ 0x0f;
+ unsigned int tmp = *sp & (0x0f0f >> (4 - shift));
+ tmp |= (unsigned int)(g << shift);
+ *sp = (png_byte)(tmp & 0xff);
+ }
+
+ if (shift == 0)
+ {
+ shift = 4;
+ sp++;
+ }
+
+ else
+ shift -= 4;
+ }
+ }
+
+ else
+#endif
+ {
+ sp = row;
+ shift = 4;
+ for (i = 0; i < row_width; i++)
+ {
+ if ((png_uint_16)((*sp >> shift) & 0x0f)
+ == png_ptr->trans_color.gray)
+ {
+ unsigned int tmp = *sp & (0x0f0f >> (4 - shift));
+ tmp |=
+ (unsigned int)(png_ptr->background.gray << shift);
+ *sp = (png_byte)(tmp & 0xff);
+ }
+
+ if (shift == 0)
+ {
+ shift = 4;
+ sp++;
+ }
+
+ else
+ shift -= 4;
+ }
+ }
+ break;
+ }
+
+ case 8:
+ {
+#ifdef PNG_READ_GAMMA_SUPPORTED
+ if (gamma_table != NULL)
+ {
+ sp = row;
+ for (i = 0; i < row_width; i++, sp++)
+ {
+ if (*sp == png_ptr->trans_color.gray)
+ *sp = (png_byte)png_ptr->background.gray;
+
+ else
+ *sp = gamma_table[*sp];
}
}
else
#endif
{
sp = row;
- for (i = 0; i < row_width; i++, sp += 3)
+ for (i = 0; i < row_width; i++, sp++)
{
- if (*sp == png_ptr->trans_color.red &&
- *(sp + 1) == png_ptr->trans_color.green &&
- *(sp + 2) == png_ptr->trans_color.blue)
- {
- *sp = (png_byte)png_ptr->background.red;
- *(sp + 1) = (png_byte)png_ptr->background.green;
- *(sp + 2) = (png_byte)png_ptr->background.blue;
- }
+ if (*sp == png_ptr->trans_color.gray)
+ *sp = (png_byte)png_ptr->background.gray;
}
}
+ break;
}
- else /* if (row_info->bit_depth == 16) */
+
+ case 16:
{
#ifdef PNG_READ_GAMMA_SUPPORTED
if (gamma_16 != NULL)
{
sp = row;
- for (i = 0; i < row_width; i++, sp += 6)
- {
- png_uint_16 r = (png_uint_16)(((*sp) << 8) + *(sp + 1));
-
- png_uint_16 g = (png_uint_16)(((*(sp + 2)) << 8)
- + *(sp + 3));
-
- png_uint_16 b = (png_uint_16)(((*(sp + 4)) << 8)
- + *(sp + 5));
-
- if (r == png_ptr->trans_color.red &&
- g == png_ptr->trans_color.green &&
- b == png_ptr->trans_color.blue)
- {
- /* Background is already in screen gamma */
- *sp = (png_byte)((png_ptr->background.red >> 8) & 0xff);
- *(sp + 1) = (png_byte)(png_ptr->background.red & 0xff);
- *(sp + 2) = (png_byte)((png_ptr->background.green >> 8)
- & 0xff);
- *(sp + 3) = (png_byte)(png_ptr->background.green
- & 0xff);
- *(sp + 4) = (png_byte)((png_ptr->background.blue >> 8)
- & 0xff);
- *(sp + 5) = (png_byte)(png_ptr->background.blue & 0xff);
- }
-
- else
- {
- png_uint_16 v = gamma_16[*(sp + 1) >> gamma_shift][*sp];
- *sp = (png_byte)((v >> 8) & 0xff);
- *(sp + 1) = (png_byte)(v & 0xff);
-
- v = gamma_16[*(sp + 3) >> gamma_shift][*(sp + 2)];
- *(sp + 2) = (png_byte)((v >> 8) & 0xff);
- *(sp + 3) = (png_byte)(v & 0xff);
-
- v = gamma_16[*(sp + 5) >> gamma_shift][*(sp + 4)];
- *(sp + 4) = (png_byte)((v >> 8) & 0xff);
- *(sp + 5) = (png_byte)(v & 0xff);
- }
- }
- }
-
- else
-#endif
- {
- sp = row;
- for (i = 0; i < row_width; i++, sp += 6)
- {
- png_uint_16 r = (png_uint_16)(((*sp) << 8) + *(sp + 1));
-
- png_uint_16 g = (png_uint_16)(((*(sp + 2)) << 8)
- + *(sp + 3));
-
- png_uint_16 b = (png_uint_16)(((*(sp + 4)) << 8)
- + *(sp + 5));
-
- if (r == png_ptr->trans_color.red &&
- g == png_ptr->trans_color.green &&
- b == png_ptr->trans_color.blue)
- {
- *sp = (png_byte)((png_ptr->background.red >> 8) & 0xff);
- *(sp + 1) = (png_byte)(png_ptr->background.red & 0xff);
- *(sp + 2) = (png_byte)((png_ptr->background.green >> 8)
- & 0xff);
- *(sp + 3) = (png_byte)(png_ptr->background.green
- & 0xff);
- *(sp + 4) = (png_byte)((png_ptr->background.blue >> 8)
- & 0xff);
- *(sp + 5) = (png_byte)(png_ptr->background.blue & 0xff);
- }
- }
- }
- }
- break;
- }
-
- case PNG_COLOR_TYPE_GRAY_ALPHA:
- {
- if (row_info->bit_depth == 8)
- {
-#ifdef PNG_READ_GAMMA_SUPPORTED
- if (gamma_to_1 != NULL && gamma_from_1 != NULL &&
- gamma_table != NULL)
- {
- sp = row;
for (i = 0; i < row_width; i++, sp += 2)
{
- png_uint_16 a = *(sp + 1);
+ png_uint_16 v;
- if (a == 0xff)
- *sp = gamma_table[*sp];
+ v = (png_uint_16)(((*sp) << 8) + *(sp + 1));
- else if (a == 0)
+ if (v == png_ptr->trans_color.gray)
{
/* Background is already in screen gamma */
- *sp = (png_byte)png_ptr->background.gray;
+ *sp = (png_byte)((png_ptr->background.gray >> 8)
+ & 0xff);
+ *(sp + 1) = (png_byte)(png_ptr->background.gray
+ & 0xff);
}
else
{
- png_byte v, w;
-
- v = gamma_to_1[*sp];
- png_composite(w, v, a, png_ptr->background_1.gray);
- if (optimize == 0)
- w = gamma_from_1[w];
- *sp = w;
+ v = gamma_16[*(sp + 1) >> gamma_shift][*sp];
+ *sp = (png_byte)((v >> 8) & 0xff);
+ *(sp + 1) = (png_byte)(v & 0xff);
}
}
}
@@ -3623,298 +3449,486 @@
sp = row;
for (i = 0; i < row_width; i++, sp += 2)
{
- png_byte a = *(sp + 1);
+ png_uint_16 v;
- if (a == 0)
- *sp = (png_byte)png_ptr->background.gray;
+ v = (png_uint_16)(((*sp) << 8) + *(sp + 1));
- else if (a < 0xff)
- png_composite(*sp, *sp, a, png_ptr->background.gray);
- }
- }
- }
- else /* if (png_ptr->bit_depth == 16) */
- {
-#ifdef PNG_READ_GAMMA_SUPPORTED
- if (gamma_16 != NULL && gamma_16_from_1 != NULL &&
- gamma_16_to_1 != NULL)
- {
- sp = row;
- for (i = 0; i < row_width; i++, sp += 4)
- {
- png_uint_16 a = (png_uint_16)(((*(sp + 2)) << 8)
- + *(sp + 3));
-
- if (a == (png_uint_16)0xffff)
- {
- png_uint_16 v;
-
- v = gamma_16[*(sp + 1) >> gamma_shift][*sp];
- *sp = (png_byte)((v >> 8) & 0xff);
- *(sp + 1) = (png_byte)(v & 0xff);
- }
-
- else if (a == 0)
- {
- /* Background is already in screen gamma */
- *sp = (png_byte)((png_ptr->background.gray >> 8)
- & 0xff);
- *(sp + 1) = (png_byte)(png_ptr->background.gray & 0xff);
- }
-
- else
- {
- png_uint_16 g, v, w;
-
- g = gamma_16_to_1[*(sp + 1) >> gamma_shift][*sp];
- png_composite_16(v, g, a, png_ptr->background_1.gray);
- if (optimize != 0)
- w = v;
- else
- w = gamma_16_from_1[(v & 0xff) >>
- gamma_shift][v >> 8];
- *sp = (png_byte)((w >> 8) & 0xff);
- *(sp + 1) = (png_byte)(w & 0xff);
- }
- }
- }
- else
-#endif
- {
- sp = row;
- for (i = 0; i < row_width; i++, sp += 4)
- {
- png_uint_16 a = (png_uint_16)(((*(sp + 2)) << 8)
- + *(sp + 3));
-
- if (a == 0)
+ if (v == png_ptr->trans_color.gray)
{
*sp = (png_byte)((png_ptr->background.gray >> 8)
- & 0xff);
- *(sp + 1) = (png_byte)(png_ptr->background.gray & 0xff);
- }
-
- else if (a < 0xffff)
- {
- png_uint_16 g, v;
-
- g = (png_uint_16)(((*sp) << 8) + *(sp + 1));
- png_composite_16(v, g, a, png_ptr->background.gray);
- *sp = (png_byte)((v >> 8) & 0xff);
- *(sp + 1) = (png_byte)(v & 0xff);
+ & 0xff);
+ *(sp + 1) = (png_byte)(png_ptr->background.gray
+ & 0xff);
}
}
}
+ break;
}
- break;
+
+ default:
+ break;
}
-
- case PNG_COLOR_TYPE_RGB_ALPHA:
- {
- if (row_info->bit_depth == 8)
- {
-#ifdef PNG_READ_GAMMA_SUPPORTED
- if (gamma_to_1 != NULL && gamma_from_1 != NULL &&
- gamma_table != NULL)
- {
- sp = row;
- for (i = 0; i < row_width; i++, sp += 4)
- {
- png_byte a = *(sp + 3);
-
- if (a == 0xff)
- {
- *sp = gamma_table[*sp];
- *(sp + 1) = gamma_table[*(sp + 1)];
- *(sp + 2) = gamma_table[*(sp + 2)];
- }
-
- else if (a == 0)
- {
- /* Background is already in screen gamma */
- *sp = (png_byte)png_ptr->background.red;
- *(sp + 1) = (png_byte)png_ptr->background.green;
- *(sp + 2) = (png_byte)png_ptr->background.blue;
- }
-
- else
- {
- png_byte v, w;
-
- v = gamma_to_1[*sp];
- png_composite(w, v, a, png_ptr->background_1.red);
- if (optimize == 0) w = gamma_from_1[w];
- *sp = w;
-
- v = gamma_to_1[*(sp + 1)];
- png_composite(w, v, a, png_ptr->background_1.green);
- if (optimize == 0) w = gamma_from_1[w];
- *(sp + 1) = w;
-
- v = gamma_to_1[*(sp + 2)];
- png_composite(w, v, a, png_ptr->background_1.blue);
- if (optimize == 0) w = gamma_from_1[w];
- *(sp + 2) = w;
- }
- }
- }
- else
-#endif
- {
- sp = row;
- for (i = 0; i < row_width; i++, sp += 4)
- {
- png_byte a = *(sp + 3);
-
- if (a == 0)
- {
- *sp = (png_byte)png_ptr->background.red;
- *(sp + 1) = (png_byte)png_ptr->background.green;
- *(sp + 2) = (png_byte)png_ptr->background.blue;
- }
-
- else if (a < 0xff)
- {
- png_composite(*sp, *sp, a, png_ptr->background.red);
-
- png_composite(*(sp + 1), *(sp + 1), a,
- png_ptr->background.green);
-
- png_composite(*(sp + 2), *(sp + 2), a,
- png_ptr->background.blue);
- }
- }
- }
- }
- else /* if (row_info->bit_depth == 16) */
- {
-#ifdef PNG_READ_GAMMA_SUPPORTED
- if (gamma_16 != NULL && gamma_16_from_1 != NULL &&
- gamma_16_to_1 != NULL)
- {
- sp = row;
- for (i = 0; i < row_width; i++, sp += 8)
- {
- png_uint_16 a = (png_uint_16)(((png_uint_16)(*(sp + 6))
- << 8) + (png_uint_16)(*(sp + 7)));
-
- if (a == (png_uint_16)0xffff)
- {
- png_uint_16 v;
-
- v = gamma_16[*(sp + 1) >> gamma_shift][*sp];
- *sp = (png_byte)((v >> 8) & 0xff);
- *(sp + 1) = (png_byte)(v & 0xff);
-
- v = gamma_16[*(sp + 3) >> gamma_shift][*(sp + 2)];
- *(sp + 2) = (png_byte)((v >> 8) & 0xff);
- *(sp + 3) = (png_byte)(v & 0xff);
-
- v = gamma_16[*(sp + 5) >> gamma_shift][*(sp + 4)];
- *(sp + 4) = (png_byte)((v >> 8) & 0xff);
- *(sp + 5) = (png_byte)(v & 0xff);
- }
-
- else if (a == 0)
- {
- /* Background is already in screen gamma */
- *sp = (png_byte)((png_ptr->background.red >> 8) & 0xff);
- *(sp + 1) = (png_byte)(png_ptr->background.red & 0xff);
- *(sp + 2) = (png_byte)((png_ptr->background.green >> 8)
- & 0xff);
- *(sp + 3) = (png_byte)(png_ptr->background.green
- & 0xff);
- *(sp + 4) = (png_byte)((png_ptr->background.blue >> 8)
- & 0xff);
- *(sp + 5) = (png_byte)(png_ptr->background.blue & 0xff);
- }
-
- else
- {
- png_uint_16 v, w;
-
- v = gamma_16_to_1[*(sp + 1) >> gamma_shift][*sp];
- png_composite_16(w, v, a, png_ptr->background_1.red);
- if (optimize == 0)
- w = gamma_16_from_1[((w & 0xff) >> gamma_shift)][w >>
- 8];
- *sp = (png_byte)((w >> 8) & 0xff);
- *(sp + 1) = (png_byte)(w & 0xff);
-
- v = gamma_16_to_1[*(sp + 3) >> gamma_shift][*(sp + 2)];
- png_composite_16(w, v, a, png_ptr->background_1.green);
- if (optimize == 0)
- w = gamma_16_from_1[((w & 0xff) >> gamma_shift)][w >>
- 8];
-
- *(sp + 2) = (png_byte)((w >> 8) & 0xff);
- *(sp + 3) = (png_byte)(w & 0xff);
-
- v = gamma_16_to_1[*(sp + 5) >> gamma_shift][*(sp + 4)];
- png_composite_16(w, v, a, png_ptr->background_1.blue);
- if (optimize == 0)
- w = gamma_16_from_1[((w & 0xff) >> gamma_shift)][w >>
- 8];
-
- *(sp + 4) = (png_byte)((w >> 8) & 0xff);
- *(sp + 5) = (png_byte)(w & 0xff);
- }
- }
- }
-
- else
-#endif
- {
- sp = row;
- for (i = 0; i < row_width; i++, sp += 8)
- {
- png_uint_16 a = (png_uint_16)(((png_uint_16)(*(sp + 6))
- << 8) + (png_uint_16)(*(sp + 7)));
-
- if (a == 0)
- {
- *sp = (png_byte)((png_ptr->background.red >> 8) & 0xff);
- *(sp + 1) = (png_byte)(png_ptr->background.red & 0xff);
- *(sp + 2) = (png_byte)((png_ptr->background.green >> 8)
- & 0xff);
- *(sp + 3) = (png_byte)(png_ptr->background.green
- & 0xff);
- *(sp + 4) = (png_byte)((png_ptr->background.blue >> 8)
- & 0xff);
- *(sp + 5) = (png_byte)(png_ptr->background.blue & 0xff);
- }
-
- else if (a < 0xffff)
- {
- png_uint_16 v;
-
- png_uint_16 r = (png_uint_16)(((*sp) << 8) + *(sp + 1));
- png_uint_16 g = (png_uint_16)(((*(sp + 2)) << 8)
- + *(sp + 3));
- png_uint_16 b = (png_uint_16)(((*(sp + 4)) << 8)
- + *(sp + 5));
-
- png_composite_16(v, r, a, png_ptr->background.red);
- *sp = (png_byte)((v >> 8) & 0xff);
- *(sp + 1) = (png_byte)(v & 0xff);
-
- png_composite_16(v, g, a, png_ptr->background.green);
- *(sp + 2) = (png_byte)((v >> 8) & 0xff);
- *(sp + 3) = (png_byte)(v & 0xff);
-
- png_composite_16(v, b, a, png_ptr->background.blue);
- *(sp + 4) = (png_byte)((v >> 8) & 0xff);
- *(sp + 5) = (png_byte)(v & 0xff);
- }
- }
- }
- }
- break;
- }
-
- default:
- break;
+ break;
}
+
+ case PNG_COLOR_TYPE_RGB:
+ {
+ if (row_info->bit_depth == 8)
+ {
+#ifdef PNG_READ_GAMMA_SUPPORTED
+ if (gamma_table != NULL)
+ {
+ sp = row;
+ for (i = 0; i < row_width; i++, sp += 3)
+ {
+ if (*sp == png_ptr->trans_color.red &&
+ *(sp + 1) == png_ptr->trans_color.green &&
+ *(sp + 2) == png_ptr->trans_color.blue)
+ {
+ *sp = (png_byte)png_ptr->background.red;
+ *(sp + 1) = (png_byte)png_ptr->background.green;
+ *(sp + 2) = (png_byte)png_ptr->background.blue;
+ }
+
+ else
+ {
+ *sp = gamma_table[*sp];
+ *(sp + 1) = gamma_table[*(sp + 1)];
+ *(sp + 2) = gamma_table[*(sp + 2)];
+ }
+ }
+ }
+ else
+#endif
+ {
+ sp = row;
+ for (i = 0; i < row_width; i++, sp += 3)
+ {
+ if (*sp == png_ptr->trans_color.red &&
+ *(sp + 1) == png_ptr->trans_color.green &&
+ *(sp + 2) == png_ptr->trans_color.blue)
+ {
+ *sp = (png_byte)png_ptr->background.red;
+ *(sp + 1) = (png_byte)png_ptr->background.green;
+ *(sp + 2) = (png_byte)png_ptr->background.blue;
+ }
+ }
+ }
+ }
+ else /* if (row_info->bit_depth == 16) */
+ {
+#ifdef PNG_READ_GAMMA_SUPPORTED
+ if (gamma_16 != NULL)
+ {
+ sp = row;
+ for (i = 0; i < row_width; i++, sp += 6)
+ {
+ png_uint_16 r = (png_uint_16)(((*sp) << 8) + *(sp + 1));
+
+ png_uint_16 g = (png_uint_16)(((*(sp + 2)) << 8)
+ + *(sp + 3));
+
+ png_uint_16 b = (png_uint_16)(((*(sp + 4)) << 8)
+ + *(sp + 5));
+
+ if (r == png_ptr->trans_color.red &&
+ g == png_ptr->trans_color.green &&
+ b == png_ptr->trans_color.blue)
+ {
+ /* Background is already in screen gamma */
+ *sp = (png_byte)((png_ptr->background.red >> 8) & 0xff);
+ *(sp + 1) = (png_byte)(png_ptr->background.red & 0xff);
+ *(sp + 2) = (png_byte)((png_ptr->background.green >> 8)
+ & 0xff);
+ *(sp + 3) = (png_byte)(png_ptr->background.green
+ & 0xff);
+ *(sp + 4) = (png_byte)((png_ptr->background.blue >> 8)
+ & 0xff);
+ *(sp + 5) = (png_byte)(png_ptr->background.blue & 0xff);
+ }
+
+ else
+ {
+ png_uint_16 v = gamma_16[*(sp + 1) >> gamma_shift][*sp];
+ *sp = (png_byte)((v >> 8) & 0xff);
+ *(sp + 1) = (png_byte)(v & 0xff);
+
+ v = gamma_16[*(sp + 3) >> gamma_shift][*(sp + 2)];
+ *(sp + 2) = (png_byte)((v >> 8) & 0xff);
+ *(sp + 3) = (png_byte)(v & 0xff);
+
+ v = gamma_16[*(sp + 5) >> gamma_shift][*(sp + 4)];
+ *(sp + 4) = (png_byte)((v >> 8) & 0xff);
+ *(sp + 5) = (png_byte)(v & 0xff);
+ }
+ }
+ }
+
+ else
+#endif
+ {
+ sp = row;
+ for (i = 0; i < row_width; i++, sp += 6)
+ {
+ png_uint_16 r = (png_uint_16)(((*sp) << 8) + *(sp + 1));
+
+ png_uint_16 g = (png_uint_16)(((*(sp + 2)) << 8)
+ + *(sp + 3));
+
+ png_uint_16 b = (png_uint_16)(((*(sp + 4)) << 8)
+ + *(sp + 5));
+
+ if (r == png_ptr->trans_color.red &&
+ g == png_ptr->trans_color.green &&
+ b == png_ptr->trans_color.blue)
+ {
+ *sp = (png_byte)((png_ptr->background.red >> 8) & 0xff);
+ *(sp + 1) = (png_byte)(png_ptr->background.red & 0xff);
+ *(sp + 2) = (png_byte)((png_ptr->background.green >> 8)
+ & 0xff);
+ *(sp + 3) = (png_byte)(png_ptr->background.green
+ & 0xff);
+ *(sp + 4) = (png_byte)((png_ptr->background.blue >> 8)
+ & 0xff);
+ *(sp + 5) = (png_byte)(png_ptr->background.blue & 0xff);
+ }
+ }
+ }
+ }
+ break;
+ }
+
+ case PNG_COLOR_TYPE_GRAY_ALPHA:
+ {
+ if (row_info->bit_depth == 8)
+ {
+#ifdef PNG_READ_GAMMA_SUPPORTED
+ if (gamma_to_1 != NULL && gamma_from_1 != NULL &&
+ gamma_table != NULL)
+ {
+ sp = row;
+ for (i = 0; i < row_width; i++, sp += 2)
+ {
+ png_uint_16 a = *(sp + 1);
+
+ if (a == 0xff)
+ *sp = gamma_table[*sp];
+
+ else if (a == 0)
+ {
+ /* Background is already in screen gamma */
+ *sp = (png_byte)png_ptr->background.gray;
+ }
+
+ else
+ {
+ png_byte v, w;
+
+ v = gamma_to_1[*sp];
+ png_composite(w, v, a, png_ptr->background_1.gray);
+ if (optimize == 0)
+ w = gamma_from_1[w];
+ *sp = w;
+ }
+ }
+ }
+ else
+#endif
+ {
+ sp = row;
+ for (i = 0; i < row_width; i++, sp += 2)
+ {
+ png_byte a = *(sp + 1);
+
+ if (a == 0)
+ *sp = (png_byte)png_ptr->background.gray;
+
+ else if (a < 0xff)
+ png_composite(*sp, *sp, a, png_ptr->background.gray);
+ }
+ }
+ }
+ else /* if (png_ptr->bit_depth == 16) */
+ {
+#ifdef PNG_READ_GAMMA_SUPPORTED
+ if (gamma_16 != NULL && gamma_16_from_1 != NULL &&
+ gamma_16_to_1 != NULL)
+ {
+ sp = row;
+ for (i = 0; i < row_width; i++, sp += 4)
+ {
+ png_uint_16 a = (png_uint_16)(((*(sp + 2)) << 8)
+ + *(sp + 3));
+
+ if (a == (png_uint_16)0xffff)
+ {
+ png_uint_16 v;
+
+ v = gamma_16[*(sp + 1) >> gamma_shift][*sp];
+ *sp = (png_byte)((v >> 8) & 0xff);
+ *(sp + 1) = (png_byte)(v & 0xff);
+ }
+
+ else if (a == 0)
+ {
+ /* Background is already in screen gamma */
+ *sp = (png_byte)((png_ptr->background.gray >> 8)
+ & 0xff);
+ *(sp + 1) = (png_byte)(png_ptr->background.gray & 0xff);
+ }
+
+ else
+ {
+ png_uint_16 g, v, w;
+
+ g = gamma_16_to_1[*(sp + 1) >> gamma_shift][*sp];
+ png_composite_16(v, g, a, png_ptr->background_1.gray);
+ if (optimize != 0)
+ w = v;
+ else
+ w = gamma_16_from_1[(v & 0xff) >>
+ gamma_shift][v >> 8];
+ *sp = (png_byte)((w >> 8) & 0xff);
+ *(sp + 1) = (png_byte)(w & 0xff);
+ }
+ }
+ }
+ else
+#endif
+ {
+ sp = row;
+ for (i = 0; i < row_width; i++, sp += 4)
+ {
+ png_uint_16 a = (png_uint_16)(((*(sp + 2)) << 8)
+ + *(sp + 3));
+
+ if (a == 0)
+ {
+ *sp = (png_byte)((png_ptr->background.gray >> 8)
+ & 0xff);
+ *(sp + 1) = (png_byte)(png_ptr->background.gray & 0xff);
+ }
+
+ else if (a < 0xffff)
+ {
+ png_uint_16 g, v;
+
+ g = (png_uint_16)(((*sp) << 8) + *(sp + 1));
+ png_composite_16(v, g, a, png_ptr->background.gray);
+ *sp = (png_byte)((v >> 8) & 0xff);
+ *(sp + 1) = (png_byte)(v & 0xff);
+ }
+ }
+ }
+ }
+ break;
+ }
+
+ case PNG_COLOR_TYPE_RGB_ALPHA:
+ {
+ if (row_info->bit_depth == 8)
+ {
+#ifdef PNG_READ_GAMMA_SUPPORTED
+ if (gamma_to_1 != NULL && gamma_from_1 != NULL &&
+ gamma_table != NULL)
+ {
+ sp = row;
+ for (i = 0; i < row_width; i++, sp += 4)
+ {
+ png_byte a = *(sp + 3);
+
+ if (a == 0xff)
+ {
+ *sp = gamma_table[*sp];
+ *(sp + 1) = gamma_table[*(sp + 1)];
+ *(sp + 2) = gamma_table[*(sp + 2)];
+ }
+
+ else if (a == 0)
+ {
+ /* Background is already in screen gamma */
+ *sp = (png_byte)png_ptr->background.red;
+ *(sp + 1) = (png_byte)png_ptr->background.green;
+ *(sp + 2) = (png_byte)png_ptr->background.blue;
+ }
+
+ else
+ {
+ png_byte v, w;
+
+ v = gamma_to_1[*sp];
+ png_composite(w, v, a, png_ptr->background_1.red);
+ if (optimize == 0) w = gamma_from_1[w];
+ *sp = w;
+
+ v = gamma_to_1[*(sp + 1)];
+ png_composite(w, v, a, png_ptr->background_1.green);
+ if (optimize == 0) w = gamma_from_1[w];
+ *(sp + 1) = w;
+
+ v = gamma_to_1[*(sp + 2)];
+ png_composite(w, v, a, png_ptr->background_1.blue);
+ if (optimize == 0) w = gamma_from_1[w];
+ *(sp + 2) = w;
+ }
+ }
+ }
+ else
+#endif
+ {
+ sp = row;
+ for (i = 0; i < row_width; i++, sp += 4)
+ {
+ png_byte a = *(sp + 3);
+
+ if (a == 0)
+ {
+ *sp = (png_byte)png_ptr->background.red;
+ *(sp + 1) = (png_byte)png_ptr->background.green;
+ *(sp + 2) = (png_byte)png_ptr->background.blue;
+ }
+
+ else if (a < 0xff)
+ {
+ png_composite(*sp, *sp, a, png_ptr->background.red);
+
+ png_composite(*(sp + 1), *(sp + 1), a,
+ png_ptr->background.green);
+
+ png_composite(*(sp + 2), *(sp + 2), a,
+ png_ptr->background.blue);
+ }
+ }
+ }
+ }
+ else /* if (row_info->bit_depth == 16) */
+ {
+#ifdef PNG_READ_GAMMA_SUPPORTED
+ if (gamma_16 != NULL && gamma_16_from_1 != NULL &&
+ gamma_16_to_1 != NULL)
+ {
+ sp = row;
+ for (i = 0; i < row_width; i++, sp += 8)
+ {
+ png_uint_16 a = (png_uint_16)(((png_uint_16)(*(sp + 6))
+ << 8) + (png_uint_16)(*(sp + 7)));
+
+ if (a == (png_uint_16)0xffff)
+ {
+ png_uint_16 v;
+
+ v = gamma_16[*(sp + 1) >> gamma_shift][*sp];
+ *sp = (png_byte)((v >> 8) & 0xff);
+ *(sp + 1) = (png_byte)(v & 0xff);
+
+ v = gamma_16[*(sp + 3) >> gamma_shift][*(sp + 2)];
+ *(sp + 2) = (png_byte)((v >> 8) & 0xff);
+ *(sp + 3) = (png_byte)(v & 0xff);
+
+ v = gamma_16[*(sp + 5) >> gamma_shift][*(sp + 4)];
+ *(sp + 4) = (png_byte)((v >> 8) & 0xff);
+ *(sp + 5) = (png_byte)(v & 0xff);
+ }
+
+ else if (a == 0)
+ {
+ /* Background is already in screen gamma */
+ *sp = (png_byte)((png_ptr->background.red >> 8) & 0xff);
+ *(sp + 1) = (png_byte)(png_ptr->background.red & 0xff);
+ *(sp + 2) = (png_byte)((png_ptr->background.green >> 8)
+ & 0xff);
+ *(sp + 3) = (png_byte)(png_ptr->background.green
+ & 0xff);
+ *(sp + 4) = (png_byte)((png_ptr->background.blue >> 8)
+ & 0xff);
+ *(sp + 5) = (png_byte)(png_ptr->background.blue & 0xff);
+ }
+
+ else
+ {
+ png_uint_16 v, w;
+
+ v = gamma_16_to_1[*(sp + 1) >> gamma_shift][*sp];
+ png_composite_16(w, v, a, png_ptr->background_1.red);
+ if (optimize == 0)
+ w = gamma_16_from_1[((w & 0xff) >> gamma_shift)][w >>
+ 8];
+ *sp = (png_byte)((w >> 8) & 0xff);
+ *(sp + 1) = (png_byte)(w & 0xff);
+
+ v = gamma_16_to_1[*(sp + 3) >> gamma_shift][*(sp + 2)];
+ png_composite_16(w, v, a, png_ptr->background_1.green);
+ if (optimize == 0)
+ w = gamma_16_from_1[((w & 0xff) >> gamma_shift)][w >>
+ 8];
+
+ *(sp + 2) = (png_byte)((w >> 8) & 0xff);
+ *(sp + 3) = (png_byte)(w & 0xff);
+
+ v = gamma_16_to_1[*(sp + 5) >> gamma_shift][*(sp + 4)];
+ png_composite_16(w, v, a, png_ptr->background_1.blue);
+ if (optimize == 0)
+ w = gamma_16_from_1[((w & 0xff) >> gamma_shift)][w >>
+ 8];
+
+ *(sp + 4) = (png_byte)((w >> 8) & 0xff);
+ *(sp + 5) = (png_byte)(w & 0xff);
+ }
+ }
+ }
+
+ else
+#endif
+ {
+ sp = row;
+ for (i = 0; i < row_width; i++, sp += 8)
+ {
+ png_uint_16 a = (png_uint_16)(((png_uint_16)(*(sp + 6))
+ << 8) + (png_uint_16)(*(sp + 7)));
+
+ if (a == 0)
+ {
+ *sp = (png_byte)((png_ptr->background.red >> 8) & 0xff);
+ *(sp + 1) = (png_byte)(png_ptr->background.red & 0xff);
+ *(sp + 2) = (png_byte)((png_ptr->background.green >> 8)
+ & 0xff);
+ *(sp + 3) = (png_byte)(png_ptr->background.green
+ & 0xff);
+ *(sp + 4) = (png_byte)((png_ptr->background.blue >> 8)
+ & 0xff);
+ *(sp + 5) = (png_byte)(png_ptr->background.blue & 0xff);
+ }
+
+ else if (a < 0xffff)
+ {
+ png_uint_16 v;
+
+ png_uint_16 r = (png_uint_16)(((*sp) << 8) + *(sp + 1));
+ png_uint_16 g = (png_uint_16)(((*(sp + 2)) << 8)
+ + *(sp + 3));
+ png_uint_16 b = (png_uint_16)(((*(sp + 4)) << 8)
+ + *(sp + 5));
+
+ png_composite_16(v, r, a, png_ptr->background.red);
+ *sp = (png_byte)((v >> 8) & 0xff);
+ *(sp + 1) = (png_byte)(v & 0xff);
+
+ png_composite_16(v, g, a, png_ptr->background.green);
+ *(sp + 2) = (png_byte)((v >> 8) & 0xff);
+ *(sp + 3) = (png_byte)(v & 0xff);
+
+ png_composite_16(v, b, a, png_ptr->background.blue);
+ *(sp + 4) = (png_byte)((v >> 8) & 0xff);
+ *(sp + 5) = (png_byte)(v & 0xff);
+ }
+ }
+ }
+ }
+ break;
+ }
+
+ default:
+ break;
}
}
#endif /* READ_BACKGROUND || READ_ALPHA_MODE */
@@ -4138,12 +4152,11 @@
{
if (row_info->bit_depth == 8)
{
- PNG_CONST png_bytep table = png_ptr->gamma_from_1;
+ png_bytep table = png_ptr->gamma_from_1;
if (table != NULL)
{
- PNG_CONST int step =
- (row_info->color_type & PNG_COLOR_MASK_COLOR) ? 4 : 2;
+ int step = (row_info->color_type & PNG_COLOR_MASK_COLOR) ? 4 : 2;
/* The alpha channel is the last component: */
row += step - 1;
@@ -4157,13 +4170,12 @@
else if (row_info->bit_depth == 16)
{
- PNG_CONST png_uint_16pp table = png_ptr->gamma_16_from_1;
- PNG_CONST int gamma_shift = png_ptr->gamma_shift;
+ png_uint_16pp table = png_ptr->gamma_16_from_1;
+ int gamma_shift = png_ptr->gamma_shift;
if (table != NULL)
{
- PNG_CONST int step =
- (row_info->color_type & PNG_COLOR_MASK_COLOR) ? 8 : 4;
+ int step = (row_info->color_type & PNG_COLOR_MASK_COLOR) ? 8 : 4;
/* The alpha channel is the last component: */
row += step - 2;
@@ -4194,8 +4206,9 @@
* upon whether you supply trans and num_trans.
*/
static void
-png_do_expand_palette(png_row_infop row_info, png_bytep row,
- png_const_colorp palette, png_const_bytep trans_alpha, int num_trans)
+png_do_expand_palette(png_structrp png_ptr, png_row_infop row_info,
+ png_bytep row, png_const_colorp palette, png_const_bytep trans_alpha,
+ int num_trans)
{
int shift, value;
png_bytep sp, dp;
@@ -4212,8 +4225,8 @@
{
case 1:
{
- sp = row + (png_size_t)((row_width - 1) >> 3);
- dp = row + (png_size_t)row_width - 1;
+ sp = row + (size_t)((row_width - 1) >> 3);
+ dp = row + (size_t)row_width - 1;
shift = 7 - (int)((row_width + 7) & 0x07);
for (i = 0; i < row_width; i++)
{
@@ -4239,8 +4252,8 @@
case 2:
{
- sp = row + (png_size_t)((row_width - 1) >> 2);
- dp = row + (png_size_t)row_width - 1;
+ sp = row + (size_t)((row_width - 1) >> 2);
+ dp = row + (size_t)row_width - 1;
shift = (int)((3 - ((row_width + 3) & 0x03)) << 1);
for (i = 0; i < row_width; i++)
{
@@ -4262,8 +4275,8 @@
case 4:
{
- sp = row + (png_size_t)((row_width - 1) >> 1);
- dp = row + (png_size_t)row_width - 1;
+ sp = row + (size_t)((row_width - 1) >> 1);
+ dp = row + (size_t)row_width - 1;
shift = (int)((row_width & 0x01) << 2);
for (i = 0; i < row_width; i++)
{
@@ -4296,17 +4309,30 @@
{
if (num_trans > 0)
{
- sp = row + (png_size_t)row_width - 1;
- dp = row + (png_size_t)(row_width << 2) - 1;
+ sp = row + (size_t)row_width - 1;
+ dp = row + ((size_t)row_width << 2) - 1;
- for (i = 0; i < row_width; i++)
+ i = 0;
+#ifdef PNG_ARM_NEON_INTRINSICS_AVAILABLE
+ if (png_ptr->riffled_palette != NULL)
+ {
+ /* The RGBA optimization works with png_ptr->bit_depth == 8
+ * but sometimes row_info->bit_depth has been changed to 8.
+ * In these cases, the palette hasn't been riffled.
+ */
+ i = png_do_expand_palette_rgba8_neon(png_ptr, row_info, row,
+ &sp, &dp);
+ }
+#else
+ PNG_UNUSED(png_ptr)
+#endif
+
+ for (; i < row_width; i++)
{
if ((int)(*sp) >= num_trans)
*dp-- = 0xff;
-
else
*dp-- = trans_alpha[*sp];
-
*dp-- = palette[*sp].blue;
*dp-- = palette[*sp].green;
*dp-- = palette[*sp].red;
@@ -4321,10 +4347,17 @@
else
{
- sp = row + (png_size_t)row_width - 1;
- dp = row + (png_size_t)(row_width * 3) - 1;
+ sp = row + (size_t)row_width - 1;
+ dp = row + (size_t)(row_width * 3) - 1;
+ i = 0;
+#ifdef PNG_ARM_NEON_INTRINSICS_AVAILABLE
+ i = png_do_expand_palette_rgb8_neon(png_ptr, row_info, row,
+ &sp, &dp);
+#else
+ PNG_UNUSED(png_ptr)
+#endif
- for (i = 0; i < row_width; i++)
+ for (; i < row_width; i++)
{
*dp-- = palette[*sp].blue;
*dp-- = palette[*sp].green;
@@ -4357,195 +4390,130 @@
png_debug(1, "in png_do_expand");
+ if (row_info->color_type == PNG_COLOR_TYPE_GRAY)
{
- if (row_info->color_type == PNG_COLOR_TYPE_GRAY)
+ unsigned int gray = trans_color != NULL ? trans_color->gray : 0;
+
+ if (row_info->bit_depth < 8)
{
- unsigned int gray = trans_color != NULL ? trans_color->gray : 0;
-
- if (row_info->bit_depth < 8)
+ switch (row_info->bit_depth)
{
- switch (row_info->bit_depth)
+ case 1:
{
- case 1:
- {
- gray = (gray & 0x01) * 0xff;
- sp = row + (png_size_t)((row_width - 1) >> 3);
- dp = row + (png_size_t)row_width - 1;
- shift = 7 - (int)((row_width + 7) & 0x07);
- for (i = 0; i < row_width; i++)
- {
- if ((*sp >> shift) & 0x01)
- *dp = 0xff;
-
- else
- *dp = 0;
-
- if (shift == 7)
- {
- shift = 0;
- sp--;
- }
-
- else
- shift++;
-
- dp--;
- }
- break;
- }
-
- case 2:
- {
- gray = (gray & 0x03) * 0x55;
- sp = row + (png_size_t)((row_width - 1) >> 2);
- dp = row + (png_size_t)row_width - 1;
- shift = (int)((3 - ((row_width + 3) & 0x03)) << 1);
- for (i = 0; i < row_width; i++)
- {
- value = (*sp >> shift) & 0x03;
- *dp = (png_byte)(value | (value << 2) | (value << 4) |
- (value << 6));
- if (shift == 6)
- {
- shift = 0;
- sp--;
- }
-
- else
- shift += 2;
-
- dp--;
- }
- break;
- }
-
- case 4:
- {
- gray = (gray & 0x0f) * 0x11;
- sp = row + (png_size_t)((row_width - 1) >> 1);
- dp = row + (png_size_t)row_width - 1;
- shift = (int)((1 - ((row_width + 1) & 0x01)) << 2);
- for (i = 0; i < row_width; i++)
- {
- value = (*sp >> shift) & 0x0f;
- *dp = (png_byte)(value | (value << 4));
- if (shift == 4)
- {
- shift = 0;
- sp--;
- }
-
- else
- shift = 4;
-
- dp--;
- }
- break;
- }
-
- default:
- break;
- }
-
- row_info->bit_depth = 8;
- row_info->pixel_depth = 8;
- row_info->rowbytes = row_width;
- }
-
- if (trans_color != NULL)
- {
- if (row_info->bit_depth == 8)
- {
- gray = gray & 0xff;
- sp = row + (png_size_t)row_width - 1;
- dp = row + (png_size_t)(row_width << 1) - 1;
-
+ gray = (gray & 0x01) * 0xff;
+ sp = row + (size_t)((row_width - 1) >> 3);
+ dp = row + (size_t)row_width - 1;
+ shift = 7 - (int)((row_width + 7) & 0x07);
for (i = 0; i < row_width; i++)
{
- if ((*sp & 0xffU) == gray)
- *dp-- = 0;
+ if ((*sp >> shift) & 0x01)
+ *dp = 0xff;
else
- *dp-- = 0xff;
+ *dp = 0;
- *dp-- = *sp--;
- }
- }
-
- else if (row_info->bit_depth == 16)
- {
- unsigned int gray_high = (gray >> 8) & 0xff;
- unsigned int gray_low = gray & 0xff;
- sp = row + row_info->rowbytes - 1;
- dp = row + (row_info->rowbytes << 1) - 1;
- for (i = 0; i < row_width; i++)
- {
- if ((*(sp - 1) & 0xffU) == gray_high &&
- (*(sp) & 0xffU) == gray_low)
+ if (shift == 7)
{
- *dp-- = 0;
- *dp-- = 0;
+ shift = 0;
+ sp--;
}
else
- {
- *dp-- = 0xff;
- *dp-- = 0xff;
- }
+ shift++;
- *dp-- = *sp--;
- *dp-- = *sp--;
+ dp--;
}
+ break;
}
- row_info->color_type = PNG_COLOR_TYPE_GRAY_ALPHA;
- row_info->channels = 2;
- row_info->pixel_depth = (png_byte)(row_info->bit_depth << 1);
- row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth,
- row_width);
+ case 2:
+ {
+ gray = (gray & 0x03) * 0x55;
+ sp = row + (size_t)((row_width - 1) >> 2);
+ dp = row + (size_t)row_width - 1;
+ shift = (int)((3 - ((row_width + 3) & 0x03)) << 1);
+ for (i = 0; i < row_width; i++)
+ {
+ value = (*sp >> shift) & 0x03;
+ *dp = (png_byte)(value | (value << 2) | (value << 4) |
+ (value << 6));
+ if (shift == 6)
+ {
+ shift = 0;
+ sp--;
+ }
+
+ else
+ shift += 2;
+
+ dp--;
+ }
+ break;
+ }
+
+ case 4:
+ {
+ gray = (gray & 0x0f) * 0x11;
+ sp = row + (size_t)((row_width - 1) >> 1);
+ dp = row + (size_t)row_width - 1;
+ shift = (int)((1 - ((row_width + 1) & 0x01)) << 2);
+ for (i = 0; i < row_width; i++)
+ {
+ value = (*sp >> shift) & 0x0f;
+ *dp = (png_byte)(value | (value << 4));
+ if (shift == 4)
+ {
+ shift = 0;
+ sp--;
+ }
+
+ else
+ shift = 4;
+
+ dp--;
+ }
+ break;
+ }
+
+ default:
+ break;
}
+
+ row_info->bit_depth = 8;
+ row_info->pixel_depth = 8;
+ row_info->rowbytes = row_width;
}
- else if (row_info->color_type == PNG_COLOR_TYPE_RGB &&
- trans_color != NULL)
+
+ if (trans_color != NULL)
{
if (row_info->bit_depth == 8)
{
- png_byte red = (png_byte)(trans_color->red & 0xff);
- png_byte green = (png_byte)(trans_color->green & 0xff);
- png_byte blue = (png_byte)(trans_color->blue & 0xff);
- sp = row + (png_size_t)row_info->rowbytes - 1;
- dp = row + (png_size_t)(row_width << 2) - 1;
+ gray = gray & 0xff;
+ sp = row + (size_t)row_width - 1;
+ dp = row + ((size_t)row_width << 1) - 1;
+
for (i = 0; i < row_width; i++)
{
- if (*(sp - 2) == red && *(sp - 1) == green && *(sp) == blue)
+ if ((*sp & 0xffU) == gray)
*dp-- = 0;
else
*dp-- = 0xff;
*dp-- = *sp--;
- *dp-- = *sp--;
- *dp-- = *sp--;
}
}
+
else if (row_info->bit_depth == 16)
{
- png_byte red_high = (png_byte)((trans_color->red >> 8) & 0xff);
- png_byte green_high = (png_byte)((trans_color->green >> 8) & 0xff);
- png_byte blue_high = (png_byte)((trans_color->blue >> 8) & 0xff);
- png_byte red_low = (png_byte)(trans_color->red & 0xff);
- png_byte green_low = (png_byte)(trans_color->green & 0xff);
- png_byte blue_low = (png_byte)(trans_color->blue & 0xff);
+ unsigned int gray_high = (gray >> 8) & 0xff;
+ unsigned int gray_low = gray & 0xff;
sp = row + row_info->rowbytes - 1;
- dp = row + (png_size_t)(row_width << 3) - 1;
+ dp = row + (row_info->rowbytes << 1) - 1;
for (i = 0; i < row_width; i++)
{
- if (*(sp - 5) == red_high &&
- *(sp - 4) == red_low &&
- *(sp - 3) == green_high &&
- *(sp - 2) == green_low &&
- *(sp - 1) == blue_high &&
- *(sp ) == blue_low)
+ if ((*(sp - 1) & 0xffU) == gray_high &&
+ (*(sp) & 0xffU) == gray_low)
{
*dp-- = 0;
*dp-- = 0;
@@ -4559,18 +4527,81 @@
*dp-- = *sp--;
*dp-- = *sp--;
- *dp-- = *sp--;
- *dp-- = *sp--;
- *dp-- = *sp--;
- *dp-- = *sp--;
}
}
- row_info->color_type = PNG_COLOR_TYPE_RGB_ALPHA;
- row_info->channels = 4;
- row_info->pixel_depth = (png_byte)(row_info->bit_depth << 2);
- row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, row_width);
+
+ row_info->color_type = PNG_COLOR_TYPE_GRAY_ALPHA;
+ row_info->channels = 2;
+ row_info->pixel_depth = (png_byte)(row_info->bit_depth << 1);
+ row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth,
+ row_width);
}
}
+ else if (row_info->color_type == PNG_COLOR_TYPE_RGB &&
+ trans_color != NULL)
+ {
+ if (row_info->bit_depth == 8)
+ {
+ png_byte red = (png_byte)(trans_color->red & 0xff);
+ png_byte green = (png_byte)(trans_color->green & 0xff);
+ png_byte blue = (png_byte)(trans_color->blue & 0xff);
+ sp = row + (size_t)row_info->rowbytes - 1;
+ dp = row + ((size_t)row_width << 2) - 1;
+ for (i = 0; i < row_width; i++)
+ {
+ if (*(sp - 2) == red && *(sp - 1) == green && *(sp) == blue)
+ *dp-- = 0;
+
+ else
+ *dp-- = 0xff;
+
+ *dp-- = *sp--;
+ *dp-- = *sp--;
+ *dp-- = *sp--;
+ }
+ }
+ else if (row_info->bit_depth == 16)
+ {
+ png_byte red_high = (png_byte)((trans_color->red >> 8) & 0xff);
+ png_byte green_high = (png_byte)((trans_color->green >> 8) & 0xff);
+ png_byte blue_high = (png_byte)((trans_color->blue >> 8) & 0xff);
+ png_byte red_low = (png_byte)(trans_color->red & 0xff);
+ png_byte green_low = (png_byte)(trans_color->green & 0xff);
+ png_byte blue_low = (png_byte)(trans_color->blue & 0xff);
+ sp = row + row_info->rowbytes - 1;
+ dp = row + ((size_t)row_width << 3) - 1;
+ for (i = 0; i < row_width; i++)
+ {
+ if (*(sp - 5) == red_high &&
+ *(sp - 4) == red_low &&
+ *(sp - 3) == green_high &&
+ *(sp - 2) == green_low &&
+ *(sp - 1) == blue_high &&
+ *(sp ) == blue_low)
+ {
+ *dp-- = 0;
+ *dp-- = 0;
+ }
+
+ else
+ {
+ *dp-- = 0xff;
+ *dp-- = 0xff;
+ }
+
+ *dp-- = *sp--;
+ *dp-- = *sp--;
+ *dp-- = *sp--;
+ *dp-- = *sp--;
+ *dp-- = *sp--;
+ *dp-- = *sp--;
+ }
+ }
+ row_info->color_type = PNG_COLOR_TYPE_RGB_ALPHA;
+ row_info->channels = 4;
+ row_info->pixel_depth = (png_byte)(row_info->bit_depth << 2);
+ row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, row_width);
+ }
}
#endif
@@ -4596,7 +4627,9 @@
png_byte *sp = row + row_info->rowbytes; /* source, last byte + 1 */
png_byte *dp = sp + row_info->rowbytes; /* destination, end + 1 */
while (dp > sp)
- dp[-2] = dp[-1] = *--sp, dp -= 2;
+ {
+ dp[-2] = dp[-1] = *--sp; dp -= 2;
+ }
row_info->rowbytes *= 2;
row_info->bit_depth = 16;
@@ -4738,7 +4771,19 @@
{
if (row_info->color_type == PNG_COLOR_TYPE_PALETTE)
{
- png_do_expand_palette(row_info, png_ptr->row_buf + 1,
+#ifdef PNG_ARM_NEON_INTRINSICS_AVAILABLE
+ if ((png_ptr->num_trans > 0) && (png_ptr->bit_depth == 8))
+ {
+ if (png_ptr->riffled_palette == NULL)
+ {
+ /* Initialize the accelerated palette expansion. */
+ png_ptr->riffled_palette =
+ (png_bytep)png_malloc(png_ptr, 256 * 4);
+ png_riffle_palette_neon(png_ptr);
+ }
+ }
+#endif
+ png_do_expand_palette(png_ptr, row_info, png_ptr->row_buf + 1,
png_ptr->palette, png_ptr->trans_alpha, png_ptr->num_trans);
}
@@ -4750,8 +4795,7 @@
&(png_ptr->trans_color));
else
- png_do_expand(row_info, png_ptr->row_buf + 1,
- NULL);
+ png_do_expand(row_info, png_ptr->row_buf + 1, NULL);
}
}
#endif
@@ -4975,7 +5019,7 @@
(png_ptr, /* png_ptr */
row_info, /* row_info: */
/* png_uint_32 width; width of row */
- /* png_size_t rowbytes; number of bytes in row */
+ /* size_t rowbytes; number of bytes in row */
/* png_byte color_type; color type of pixels */
/* png_byte bit_depth; bit depth of samples */
/* png_byte channels; number of channels (1-4) */
diff --git a/pngrutil.c b/pngrutil.c
index a1d92fe..fecbb4f 100644
--- a/pngrutil.c
+++ b/pngrutil.c
@@ -1,10 +1,10 @@
/* pngrutil.c - utilities to read a PNG file
*
- * Last changed in libpng 1.6.24 [August 4, 2016]
- * Copyright (c) 1998-2002,2004,2006-2016 Glenn Randers-Pehrson
- * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
- * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
+ * Copyright (c) 2018 Cosmin Truta
+ * Copyright (c) 1998-2002,2004,2006-2018 Glenn Randers-Pehrson
+ * Copyright (c) 1996-1997 Andreas Dilger
+ * Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
@@ -86,7 +86,7 @@
{
png_uint_32 uval = png_get_uint_32(buf);
if ((uval & 0x80000000) == 0) /* non-negative */
- return uval;
+ return (png_int_32)uval;
uval = (uval ^ 0xffffffff) + 1; /* 2's complement: -x = ~x+1 */
if ((uval & 0x80000000) == 0) /* no overflow */
@@ -102,7 +102,7 @@
png_uint_16 (PNGAPI
png_get_uint_16)(png_const_bytep buf)
{
- /* ANSI-C requires an int value to accomodate at least 16 bits so this
+ /* ANSI-C requires an int value to accommodate at least 16 bits so this
* works and allows the compiler not to worry about possible narrowing
* on 32-bit systems. (Pre-ANSI systems did not make integers smaller
* than 16 bits either.)
@@ -120,7 +120,7 @@
void /* PRIVATE */
png_read_sig(png_structrp png_ptr, png_inforp info_ptr)
{
- png_size_t num_checked, num_to_check;
+ size_t num_checked, num_to_check;
/* Exit if the user application does not expect a signature. */
if (png_ptr->sig_bytes >= 8)
@@ -181,6 +181,9 @@
/* Check to see if chunk name is valid. */
png_check_chunk_name(png_ptr, png_ptr->chunk_name);
+ /* Check for too-large chunk length */
+ png_check_chunk_length(png_ptr, length);
+
#ifdef PNG_IO_STATE_SUPPORTED
png_ptr->io_state = PNG_IO_READING | PNG_IO_CHUNK_DATA;
#endif
@@ -311,6 +314,7 @@
if (buffer != NULL)
{
+ memset(buffer, 0, new_size); /* just in case */
png_ptr->read_buffer = buffer;
png_ptr->read_buffer_size = new_size;
}
@@ -370,11 +374,10 @@
*/
{
int ret; /* zlib return code */
-#if PNG_ZLIB_VERNUM >= 0x1240
+#if ZLIB_VERNUM >= 0x1240
+ int window_bits = 0;
# if defined(PNG_SET_OPTION_SUPPORTED) && defined(PNG_MAXIMUM_INFLATE_WINDOW)
- int window_bits;
-
if (((png_ptr->options >> PNG_MAXIMUM_INFLATE_WINDOW) & 3) ==
PNG_OPTION_ON)
{
@@ -384,13 +387,11 @@
else
{
- window_bits = 0;
png_ptr->zstream_start = 1;
}
-# else
-# define window_bits 0
# endif
-#endif
+
+#endif /* ZLIB_VERNUM >= 0x1240 */
/* Set this for safety, just in case the previous owner left pointers to
* memory allocations.
@@ -402,25 +403,32 @@
if ((png_ptr->flags & PNG_FLAG_ZSTREAM_INITIALIZED) != 0)
{
-#if PNG_ZLIB_VERNUM < 0x1240
- ret = inflateReset(&png_ptr->zstream);
-#else
+#if ZLIB_VERNUM >= 0x1240
ret = inflateReset2(&png_ptr->zstream, window_bits);
+#else
+ ret = inflateReset(&png_ptr->zstream);
#endif
}
else
{
-#if PNG_ZLIB_VERNUM < 0x1240
- ret = inflateInit(&png_ptr->zstream);
-#else
+#if ZLIB_VERNUM >= 0x1240
ret = inflateInit2(&png_ptr->zstream, window_bits);
+#else
+ ret = inflateInit(&png_ptr->zstream);
#endif
if (ret == Z_OK)
png_ptr->flags |= PNG_FLAG_ZSTREAM_INITIALIZED;
}
+#if ZLIB_VERNUM >= 0x1290 && \
+ defined(PNG_SET_OPTION_SUPPORTED) && defined(PNG_IGNORE_ADLER32)
+ if (((png_ptr->options >> PNG_IGNORE_ADLER32) & 3) == PNG_OPTION_ON)
+ /* Turn off validation of the ADLER32 checksum in IDAT chunks */
+ ret = inflateValidate(&png_ptr->zstream, 0);
+#endif
+
if (ret == Z_OK)
png_ptr->zowner = owner;
@@ -435,7 +443,7 @@
#endif
}
-#if PNG_ZLIB_VERNUM >= 0x1240
+#if ZLIB_VERNUM >= 0x1240
/* Handle the start of the inflate stream if we called inflateInit2(strm,0);
* in this case some zlib versions skip validation of the CINFO field and, in
* certain circumstances, libpng may end up displaying an invalid image, in
@@ -461,6 +469,7 @@
#endif /* Zlib >= 1.2.4 */
#ifdef PNG_READ_COMPRESSED_TEXT_SUPPORTED
+#if defined(PNG_READ_zTXt_SUPPORTED) || defined (PNG_READ_iTXt_SUPPORTED)
/* png_inflate now returns zlib error codes including Z_OK and Z_STREAM_END to
* allow the caller to do multiple calls if required. If the 'finish' flag is
* set Z_FINISH will be passed to the final inflate() call and Z_STREAM_END must
@@ -590,7 +599,6 @@
}
}
-#if defined(PNG_READ_zTXt_SUPPORTED) || defined (PNG_READ_iTXt_SUPPORTED)
/*
* Decompress trailing data in a chunk. The assumption is that read_buffer
* points at an allocated area holding the contents of a chunk with a
@@ -666,6 +674,8 @@
if (text != NULL)
{
+ memset(text, 0, buffer_size);
+
ret = png_inflate(png_ptr, png_ptr->chunk_name, 1/*finish*/,
png_ptr->read_buffer + prefix_size, &lzsize,
text + prefix_size, newlength);
@@ -713,7 +723,7 @@
* the extra space may otherwise be used as a Trojan Horse.
*/
if (ret == Z_STREAM_END &&
- chunklength - prefix_size != lzsize)
+ chunklength - prefix_size != lzsize)
png_chunk_benign_error(png_ptr, "extra compressed data");
}
@@ -729,9 +739,7 @@
{
/* inflateReset failed, store the error message */
png_zstream_error(png_ptr, ret);
-
- if (ret == Z_STREAM_END)
- ret = PNG_UNEXPECTED_ZLIB_RETURN;
+ ret = PNG_UNEXPECTED_ZLIB_RETURN;
}
}
@@ -823,7 +831,7 @@
return Z_STREAM_ERROR;
}
}
-#endif
+#endif /* READ_iCCP */
/* Read and check the IDHR chunk */
@@ -1011,7 +1019,7 @@
if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
#endif
{
- png_crc_finish(png_ptr, (int) length - num * 3);
+ png_crc_finish(png_ptr, (png_uint_32) (length - (unsigned int)num * 3));
}
#ifndef PNG_READ_OPT_PLTE_SUPPORTED
@@ -1373,11 +1381,13 @@
* chunk is just ignored, so does not invalidate the color space. An
* alternative is to set the 'invalid' flags at the start of this routine
* and only clear them in they were not set before and all the tests pass.
- * The minimum 'deflate' stream is assumed to be just the 2 byte header and
- * 4 byte checksum. The keyword must be at least one character and there is
- * a terminator (0) byte and the compression method.
*/
- if (length < 9)
+
+ /* The keyword must be at least one character and there is a
+ * terminator (0) byte and the compression method byte, and the
+ * 'zlib' datastream is at least 11 bytes.
+ */
+ if (length < 14)
{
png_crc_finish(png_ptr, length);
png_chunk_benign_error(png_ptr, "too short");
@@ -1409,6 +1419,16 @@
png_crc_read(png_ptr, (png_bytep)keyword, read_length);
length -= read_length;
+ /* The minimum 'zlib' stream is assumed to be just the 2 byte header,
+ * 5 bytes minimum 'deflate' stream, and the 4 byte checksum.
+ */
+ if (length < 11)
+ {
+ png_crc_finish(png_ptr, length);
+ png_chunk_benign_error(png_ptr, "too short");
+ return;
+ }
+
keyword_length = 0;
while (keyword_length < 80 && keyword_length < read_length &&
keyword[keyword_length] != 0)
@@ -1427,7 +1447,7 @@
if (png_inflate_claim(png_ptr, png_iCCP) == Z_OK)
{
- Byte profile_header[132];
+ Byte profile_header[132]={0};
Byte local_buffer[PNG_INFLATE_BUF_SIZE];
png_alloc_size_t size = (sizeof profile_header);
@@ -1441,8 +1461,7 @@
{
/* We have the ICC profile header; do the basic header checks.
*/
- const png_uint_32 profile_length =
- png_get_uint_32(profile_header);
+ png_uint_32 profile_length = png_get_uint_32(profile_header);
if (png_icc_check_length(png_ptr, &png_ptr->colorspace,
keyword, profile_length) != 0)
@@ -1457,10 +1476,10 @@
/* Now read the tag table; a variable size buffer is
* needed at this point, allocate one for the whole
* profile. The header check has already validated
- * that none of these stuff will overflow.
+ * that none of this stuff will overflow.
*/
- const png_uint_32 tag_count = png_get_uint_32(
- profile_header+128);
+ png_uint_32 tag_count =
+ png_get_uint_32(profile_header + 128);
png_bytep profile = png_read_buffer(png_ptr,
profile_length, 2/*silent*/);
@@ -1564,19 +1583,11 @@
return;
}
}
-
- else if (size > 0)
- errmsg = "truncated";
-
-#ifndef __COVERITY__
- else
+ if (errmsg == NULL)
errmsg = png_ptr->zstream.msg;
-#endif
}
-
/* else png_icc_check_tag_table output an error */
}
-
else /* profile truncated */
errmsg = png_ptr->zstream.msg;
}
@@ -1636,7 +1647,7 @@
int entry_size, i;
png_uint_32 skip = 0;
png_uint_32 dl;
- png_size_t max_dl;
+ size_t max_dl;
png_debug(1, "in png_handle_sPLT");
@@ -1717,13 +1728,13 @@
data_length = length - (png_uint_32)(entry_start - buffer);
/* Integrity-check the data length */
- if ((data_length % entry_size) != 0)
+ if ((data_length % (unsigned int)entry_size) != 0)
{
png_warning(png_ptr, "sPLT chunk has bad length");
return;
}
- dl = (png_int_32)(data_length / entry_size);
+ dl = (png_uint_32)(data_length / (unsigned int)entry_size);
max_dl = PNG_SIZE_MAX / (sizeof (png_sPLT_entry));
if (dl > max_dl)
@@ -1732,10 +1743,10 @@
return;
}
- new_palette.nentries = (png_int_32)(data_length / entry_size);
+ new_palette.nentries = (png_int_32)(data_length / (unsigned int)entry_size);
- new_palette.entries = (png_sPLT_entryp)png_malloc_warn(
- png_ptr, new_palette.nentries * (sizeof (png_sPLT_entry)));
+ new_palette.entries = (png_sPLT_entryp)png_malloc_warn(png_ptr,
+ (png_alloc_size_t) new_palette.nentries * (sizeof (png_sPLT_entry)));
if (new_palette.entries == NULL)
{
@@ -1985,6 +1996,15 @@
else if ((png_ptr->color_type & PNG_COLOR_MASK_COLOR) == 0) /* GRAY */
{
+ if (png_ptr->bit_depth <= 8)
+ {
+ if (buf[0] != 0 || buf[1] >= (unsigned int)(1 << png_ptr->bit_depth))
+ {
+ png_chunk_benign_error(png_ptr, "invalid gray level");
+ return;
+ }
+ }
+
background.index = 0;
background.red =
background.green =
@@ -1994,6 +2014,15 @@
else
{
+ if (png_ptr->bit_depth <= 8)
+ {
+ if (buf[0] != 0 || buf[2] != 0 || buf[4] != 0)
+ {
+ png_chunk_benign_error(png_ptr, "invalid color");
+ return;
+ }
+ }
+
background.index = 0;
background.red = png_get_uint_16(buf);
background.green = png_get_uint_16(buf + 2);
@@ -2005,6 +2034,69 @@
}
#endif
+#ifdef PNG_READ_eXIf_SUPPORTED
+void /* PRIVATE */
+png_handle_eXIf(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
+{
+ unsigned int i;
+
+ png_debug(1, "in png_handle_eXIf");
+
+ if ((png_ptr->mode & PNG_HAVE_IHDR) == 0)
+ png_chunk_error(png_ptr, "missing IHDR");
+
+ if (length < 2)
+ {
+ png_crc_finish(png_ptr, length);
+ png_chunk_benign_error(png_ptr, "too short");
+ return;
+ }
+
+ else if (info_ptr == NULL || (info_ptr->valid & PNG_INFO_eXIf) != 0)
+ {
+ png_crc_finish(png_ptr, length);
+ png_chunk_benign_error(png_ptr, "duplicate");
+ return;
+ }
+
+ info_ptr->free_me |= PNG_FREE_EXIF;
+
+ info_ptr->eXIf_buf = png_voidcast(png_bytep,
+ png_malloc_warn(png_ptr, length));
+
+ if (info_ptr->eXIf_buf == NULL)
+ {
+ png_crc_finish(png_ptr, length);
+ png_chunk_benign_error(png_ptr, "out of memory");
+ return;
+ }
+
+ for (i = 0; i < length; i++)
+ {
+ png_byte buf[1];
+ png_crc_read(png_ptr, buf, 1);
+ info_ptr->eXIf_buf[i] = buf[0];
+ if (i == 1 && buf[0] != 'M' && buf[0] != 'I'
+ && info_ptr->eXIf_buf[0] != buf[0])
+ {
+ png_crc_finish(png_ptr, length);
+ png_chunk_benign_error(png_ptr, "incorrect byte-order specifier");
+ png_free(png_ptr, info_ptr->eXIf_buf);
+ info_ptr->eXIf_buf = NULL;
+ return;
+ }
+ }
+
+ if (png_crc_finish(png_ptr, 0) != 0)
+ return;
+
+ png_set_eXIf_1(png_ptr, info_ptr, length, info_ptr->eXIf_buf);
+
+ png_free(png_ptr, info_ptr->eXIf_buf);
+ info_ptr->eXIf_buf = NULL;
+}
+#endif
+
#ifdef PNG_READ_hIST_SUPPORTED
void /* PRIVATE */
png_handle_hIST(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
@@ -2284,7 +2376,7 @@
png_handle_sCAL(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
{
png_bytep buffer;
- png_size_t i;
+ size_t i;
int state;
png_debug(1, "in png_handle_sCAL");
@@ -2354,7 +2446,7 @@
else
{
- png_size_t heighti = i;
+ size_t heighti = i;
state = 0;
if (png_check_fp_number((png_const_charp)buffer, length,
@@ -2533,6 +2625,9 @@
if ((png_ptr->mode & PNG_HAVE_IDAT) != 0)
png_ptr->mode |= PNG_AFTER_IDAT;
+ /* Note, "length" is sufficient here; we won't be adding
+ * a null terminator later.
+ */
buffer = png_read_buffer(png_ptr, length, 2/*silent*/);
if (buffer == NULL)
@@ -2579,23 +2674,28 @@
{
png_text text;
- /* It worked; png_ptr->read_buffer now looks like a tEXt chunk except
- * for the extra compression type byte and the fact that it isn't
- * necessarily '\0' terminated.
- */
- buffer = png_ptr->read_buffer;
- buffer[uncompressed_length+(keyword_length+2)] = 0;
+ if (png_ptr->read_buffer == NULL)
+ errmsg="Read failure in png_handle_zTXt";
+ else
+ {
+ /* It worked; png_ptr->read_buffer now looks like a tEXt chunk
+ * except for the extra compression type byte and the fact that
+ * it isn't necessarily '\0' terminated.
+ */
+ buffer = png_ptr->read_buffer;
+ buffer[uncompressed_length+(keyword_length+2)] = 0;
- text.compression = PNG_TEXT_COMPRESSION_zTXt;
- text.key = (png_charp)buffer;
- text.text = (png_charp)(buffer + keyword_length+2);
- text.text_length = uncompressed_length;
- text.itxt_length = 0;
- text.lang = NULL;
- text.lang_key = NULL;
+ text.compression = PNG_TEXT_COMPRESSION_zTXt;
+ text.key = (png_charp)buffer;
+ text.text = (png_charp)(buffer + keyword_length+2);
+ text.text_length = uncompressed_length;
+ text.itxt_length = 0;
+ text.lang = NULL;
+ text.lang_key = NULL;
- if (png_set_text_2(png_ptr, info_ptr, &text, 1) != 0)
- errmsg = "insufficient memory";
+ if (png_set_text_2(png_ptr, info_ptr, &text, 1) != 0)
+ errmsg = "insufficient memory";
+ }
}
else
@@ -2784,7 +2884,7 @@
{
PNG_CSTRING_FROM_CHUNK(png_ptr->unknown_chunk.name, png_ptr->chunk_name);
/* The following is safe because of the PNG_SIZE_MAX init above */
- png_ptr->unknown_chunk.size = (png_size_t)length/*SAFE*/;
+ png_ptr->unknown_chunk.size = (size_t)length/*SAFE*/;
/* 'mode' is a flag array, only the bottom four bits matter here */
png_ptr->unknown_chunk.location = (png_byte)png_ptr->mode/*SAFE*/;
@@ -2971,7 +3071,7 @@
case 2:
png_ptr->user_chunk_cache_max = 1;
png_chunk_benign_error(png_ptr, "no space in chunk cache");
- /* FALL THROUGH */
+ /* FALLTHROUGH */
case 1:
/* NOTE: prior to 1.6.0 this case resulted in an unknown critical
* chunk being skipped, now there will be a hard error below.
@@ -2980,7 +3080,7 @@
default: /* not at limit */
--(png_ptr->user_chunk_cache_max);
- /* FALL THROUGH */
+ /* FALLTHROUGH */
case 0: /* no limit */
# endif /* USER_LIMITS */
/* Here when the limit isn't reached or when limits are compiled
@@ -3031,20 +3131,61 @@
*/
void /* PRIVATE */
-png_check_chunk_name(png_structrp png_ptr, png_uint_32 chunk_name)
+png_check_chunk_name(png_const_structrp png_ptr, png_uint_32 chunk_name)
{
int i;
+ png_uint_32 cn=chunk_name;
png_debug(1, "in png_check_chunk_name");
for (i=1; i<=4; ++i)
{
- int c = chunk_name & 0xff;
+ int c = cn & 0xff;
if (c < 65 || c > 122 || (c > 90 && c < 97))
png_chunk_error(png_ptr, "invalid chunk type");
- chunk_name >>= 8;
+ cn >>= 8;
+ }
+}
+
+void /* PRIVATE */
+png_check_chunk_length(png_const_structrp png_ptr, png_uint_32 length)
+{
+ png_alloc_size_t limit = PNG_UINT_31_MAX;
+
+# ifdef PNG_SET_USER_LIMITS_SUPPORTED
+ if (png_ptr->user_chunk_malloc_max > 0 &&
+ png_ptr->user_chunk_malloc_max < limit)
+ limit = png_ptr->user_chunk_malloc_max;
+# elif PNG_USER_CHUNK_MALLOC_MAX > 0
+ if (PNG_USER_CHUNK_MALLOC_MAX < limit)
+ limit = PNG_USER_CHUNK_MALLOC_MAX;
+# endif
+ if (png_ptr->chunk_name == png_IDAT)
+ {
+ png_alloc_size_t idat_limit = PNG_UINT_31_MAX;
+ size_t row_factor =
+ (size_t)png_ptr->width
+ * (size_t)png_ptr->channels
+ * (png_ptr->bit_depth > 8? 2: 1)
+ + 1
+ + (png_ptr->interlaced? 6: 0);
+ if (png_ptr->height > PNG_UINT_32_MAX/row_factor)
+ idat_limit = PNG_UINT_31_MAX;
+ else
+ idat_limit = png_ptr->height * row_factor;
+ row_factor = row_factor > 32566? 32566 : row_factor;
+ idat_limit += 6 + 5*(idat_limit/row_factor+1); /* zlib+deflate overhead */
+ idat_limit=idat_limit < PNG_UINT_31_MAX? idat_limit : PNG_UINT_31_MAX;
+ limit = limit < idat_limit? idat_limit : limit;
+ }
+
+ if (length > limit)
+ {
+ png_debug2(0," length = %lu, limit = %lu",
+ (unsigned long)length,(unsigned long)limit);
+ png_chunk_error(png_ptr, "chunk data is too large");
}
}
@@ -3099,7 +3240,7 @@
# ifdef PNG_READ_PACKSWAP_SUPPORTED
if ((png_ptr->transformations & PNG_PACKSWAP) != 0)
/* little-endian byte */
- end_mask = 0xff << end_mask;
+ end_mask = (unsigned int)(0xff << end_mask);
else /* big-endian byte */
# endif
@@ -3221,7 +3362,7 @@
/* Hence the pre-compiled masks indexed by PACKSWAP (or not), depth and
* then pass:
*/
- static PNG_CONST png_uint_32 row_mask[2/*PACKSWAP*/][3/*depth*/][6] =
+ static const png_uint_32 row_mask[2/*PACKSWAP*/][3/*depth*/][6] =
{
/* Little-endian byte masks for PACKSWAP */
{ S_MASKS(1,0), S_MASKS(2,0), S_MASKS(4,0) },
@@ -3232,7 +3373,7 @@
/* display_mask has only three entries for the odd passes, so index by
* pass>>1.
*/
- static PNG_CONST png_uint_32 display_mask[2][3][3] =
+ static const png_uint_32 display_mask[2][3][3] =
{
/* Little-endian byte masks for PACKSWAP */
{ B_MASKS(1,0), B_MASKS(2,0), B_MASKS(4,0) },
@@ -3373,7 +3514,7 @@
*/
do
{
- dp[0] = sp[0], dp[1] = sp[1];
+ dp[0] = sp[0]; dp[1] = sp[1];
if (row_width <= bytes_to_jump)
return;
@@ -3394,7 +3535,7 @@
*/
for (;;)
{
- dp[0] = sp[0], dp[1] = sp[1], dp[2] = sp[2];
+ dp[0] = sp[0]; dp[1] = sp[1]; dp[2] = sp[2];
if (row_width <= bytes_to_jump)
return;
@@ -3545,7 +3686,7 @@
{
/* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */
/* Offset to next interlace block */
- static PNG_CONST int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
+ static const unsigned int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
png_debug(1, "in png_do_read_interlace");
if (row != NULL && row_info != NULL)
@@ -3558,11 +3699,12 @@
{
case 1:
{
- png_bytep sp = row + (png_size_t)((row_info->width - 1) >> 3);
- png_bytep dp = row + (png_size_t)((final_width - 1) >> 3);
- int sshift, dshift;
- int s_start, s_end, s_inc;
- int jstop = png_pass_inc[pass];
+ png_bytep sp = row + (size_t)((row_info->width - 1) >> 3);
+ png_bytep dp = row + (size_t)((final_width - 1) >> 3);
+ unsigned int sshift, dshift;
+ unsigned int s_start, s_end;
+ int s_inc;
+ int jstop = (int)png_pass_inc[pass];
png_byte v;
png_uint_32 i;
int j;
@@ -3570,8 +3712,8 @@
#ifdef PNG_READ_PACKSWAP_SUPPORTED
if ((transformations & PNG_PACKSWAP) != 0)
{
- sshift = (int)((row_info->width + 7) & 0x07);
- dshift = (int)((final_width + 7) & 0x07);
+ sshift = ((row_info->width + 7) & 0x07);
+ dshift = ((final_width + 7) & 0x07);
s_start = 7;
s_end = 0;
s_inc = -1;
@@ -3580,8 +3722,8 @@
else
#endif
{
- sshift = 7 - (int)((row_info->width + 7) & 0x07);
- dshift = 7 - (int)((final_width + 7) & 0x07);
+ sshift = 7 - ((row_info->width + 7) & 0x07);
+ dshift = 7 - ((final_width + 7) & 0x07);
s_start = 0;
s_end = 7;
s_inc = 1;
@@ -3593,7 +3735,7 @@
for (j = 0; j < jstop; j++)
{
unsigned int tmp = *dp & (0x7f7f >> (7 - dshift));
- tmp |= v << dshift;
+ tmp |= (unsigned int)(v << dshift);
*dp = (png_byte)(tmp & 0xff);
if (dshift == s_end)
@@ -3603,7 +3745,7 @@
}
else
- dshift += s_inc;
+ dshift = (unsigned int)((int)dshift + s_inc);
}
if (sshift == s_end)
@@ -3613,7 +3755,7 @@
}
else
- sshift += s_inc;
+ sshift = (unsigned int)((int)sshift + s_inc);
}
break;
}
@@ -3622,16 +3764,17 @@
{
png_bytep sp = row + (png_uint_32)((row_info->width - 1) >> 2);
png_bytep dp = row + (png_uint_32)((final_width - 1) >> 2);
- int sshift, dshift;
- int s_start, s_end, s_inc;
- int jstop = png_pass_inc[pass];
+ unsigned int sshift, dshift;
+ unsigned int s_start, s_end;
+ int s_inc;
+ int jstop = (int)png_pass_inc[pass];
png_uint_32 i;
#ifdef PNG_READ_PACKSWAP_SUPPORTED
if ((transformations & PNG_PACKSWAP) != 0)
{
- sshift = (int)(((row_info->width + 3) & 0x03) << 1);
- dshift = (int)(((final_width + 3) & 0x03) << 1);
+ sshift = (((row_info->width + 3) & 0x03) << 1);
+ dshift = (((final_width + 3) & 0x03) << 1);
s_start = 6;
s_end = 0;
s_inc = -2;
@@ -3640,8 +3783,8 @@
else
#endif
{
- sshift = (int)((3 - ((row_info->width + 3) & 0x03)) << 1);
- dshift = (int)((3 - ((final_width + 3) & 0x03)) << 1);
+ sshift = ((3 - ((row_info->width + 3) & 0x03)) << 1);
+ dshift = ((3 - ((final_width + 3) & 0x03)) << 1);
s_start = 0;
s_end = 6;
s_inc = 2;
@@ -3656,7 +3799,7 @@
for (j = 0; j < jstop; j++)
{
unsigned int tmp = *dp & (0x3f3f >> (6 - dshift));
- tmp |= v << dshift;
+ tmp |= (unsigned int)(v << dshift);
*dp = (png_byte)(tmp & 0xff);
if (dshift == s_end)
@@ -3666,7 +3809,7 @@
}
else
- dshift += s_inc;
+ dshift = (unsigned int)((int)dshift + s_inc);
}
if (sshift == s_end)
@@ -3676,25 +3819,26 @@
}
else
- sshift += s_inc;
+ sshift = (unsigned int)((int)sshift + s_inc);
}
break;
}
case 4:
{
- png_bytep sp = row + (png_size_t)((row_info->width - 1) >> 1);
- png_bytep dp = row + (png_size_t)((final_width - 1) >> 1);
- int sshift, dshift;
- int s_start, s_end, s_inc;
+ png_bytep sp = row + (size_t)((row_info->width - 1) >> 1);
+ png_bytep dp = row + (size_t)((final_width - 1) >> 1);
+ unsigned int sshift, dshift;
+ unsigned int s_start, s_end;
+ int s_inc;
png_uint_32 i;
- int jstop = png_pass_inc[pass];
+ int jstop = (int)png_pass_inc[pass];
#ifdef PNG_READ_PACKSWAP_SUPPORTED
if ((transformations & PNG_PACKSWAP) != 0)
{
- sshift = (int)(((row_info->width + 1) & 0x01) << 2);
- dshift = (int)(((final_width + 1) & 0x01) << 2);
+ sshift = (((row_info->width + 1) & 0x01) << 2);
+ dshift = (((final_width + 1) & 0x01) << 2);
s_start = 4;
s_end = 0;
s_inc = -4;
@@ -3703,8 +3847,8 @@
else
#endif
{
- sshift = (int)((1 - ((row_info->width + 1) & 0x01)) << 2);
- dshift = (int)((1 - ((final_width + 1) & 0x01)) << 2);
+ sshift = ((1 - ((row_info->width + 1) & 0x01)) << 2);
+ dshift = ((1 - ((final_width + 1) & 0x01)) << 2);
s_start = 0;
s_end = 4;
s_inc = 4;
@@ -3718,7 +3862,7 @@
for (j = 0; j < jstop; j++)
{
unsigned int tmp = *dp & (0xf0f >> (4 - dshift));
- tmp |= v << dshift;
+ tmp |= (unsigned int)(v << dshift);
*dp = (png_byte)(tmp & 0xff);
if (dshift == s_end)
@@ -3728,7 +3872,7 @@
}
else
- dshift += s_inc;
+ dshift = (unsigned int)((int)dshift + s_inc);
}
if (sshift == s_end)
@@ -3738,21 +3882,21 @@
}
else
- sshift += s_inc;
+ sshift = (unsigned int)((int)sshift + s_inc);
}
break;
}
default:
{
- png_size_t pixel_bytes = (row_info->pixel_depth >> 3);
+ size_t pixel_bytes = (row_info->pixel_depth >> 3);
- png_bytep sp = row + (png_size_t)(row_info->width - 1)
+ png_bytep sp = row + (size_t)(row_info->width - 1)
* pixel_bytes;
- png_bytep dp = row + (png_size_t)(final_width - 1) * pixel_bytes;
+ png_bytep dp = row + (size_t)(final_width - 1) * pixel_bytes;
- int jstop = png_pass_inc[pass];
+ int jstop = (int)png_pass_inc[pass];
png_uint_32 i;
for (i = 0; i < row_info->width; i++)
@@ -3787,8 +3931,8 @@
png_read_filter_row_sub(png_row_infop row_info, png_bytep row,
png_const_bytep prev_row)
{
- png_size_t i;
- png_size_t istop = row_info->rowbytes;
+ size_t i;
+ size_t istop = row_info->rowbytes;
unsigned int bpp = (row_info->pixel_depth + 7) >> 3;
png_bytep rp = row + bpp;
@@ -3805,8 +3949,8 @@
png_read_filter_row_up(png_row_infop row_info, png_bytep row,
png_const_bytep prev_row)
{
- png_size_t i;
- png_size_t istop = row_info->rowbytes;
+ size_t i;
+ size_t istop = row_info->rowbytes;
png_bytep rp = row;
png_const_bytep pp = prev_row;
@@ -3821,11 +3965,11 @@
png_read_filter_row_avg(png_row_infop row_info, png_bytep row,
png_const_bytep prev_row)
{
- png_size_t i;
+ size_t i;
png_bytep rp = row;
png_const_bytep pp = prev_row;
unsigned int bpp = (row_info->pixel_depth + 7) >> 3;
- png_size_t istop = row_info->rowbytes - bpp;
+ size_t istop = row_info->rowbytes - bpp;
for (i = 0; i < bpp; i++)
{
@@ -3880,7 +4024,10 @@
/* Find the best predictor, the least of pa, pb, pc favoring the earlier
* ones in the case of a tie.
*/
- if (pb < pa) pa = pb, a = b;
+ if (pb < pa)
+ {
+ pa = pb; a = b;
+ }
if (pc < pa) a = c;
/* Calculate the current pixel in a, and move the previous row pixel to c
@@ -3896,7 +4043,7 @@
png_read_filter_row_paeth_multibyte_pixel(png_row_infop row_info, png_bytep row,
png_const_bytep prev_row)
{
- int bpp = (row_info->pixel_depth + 7) >> 3;
+ unsigned int bpp = (row_info->pixel_depth + 7) >> 3;
png_bytep rp_end = row + bpp;
/* Process the first pixel in the row completely (this is the same as 'up'
@@ -3909,7 +4056,7 @@
}
/* Remainder */
- rp_end += row_info->rowbytes - bpp;
+ rp_end = rp_end + (row_info->rowbytes - bpp);
while (row < rp_end)
{
@@ -3932,7 +4079,10 @@
pc = (p + pc) < 0 ? -(p + pc) : p + pc;
#endif
- if (pb < pa) pa = pb, a = b;
+ if (pb < pa)
+ {
+ pa = pb; a = b;
+ }
if (pc < pa) a = c;
a += *row;
@@ -4178,16 +4328,16 @@
/* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */
/* Start of interlace block */
- static PNG_CONST png_byte png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0};
+ static const png_byte png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0};
/* Offset to next interlace block */
- static PNG_CONST png_byte png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
+ static const png_byte png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
/* Start of interlace block in the y direction */
- static PNG_CONST png_byte png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1};
+ static const png_byte png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1};
/* Offset to next interlace block in the y direction */
- static PNG_CONST png_byte png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2};
+ static const png_byte png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2};
png_debug(1, "in png_read_finish_row");
png_ptr->row_number++;
@@ -4243,19 +4393,19 @@
/* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */
/* Start of interlace block */
- static PNG_CONST png_byte png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0};
+ static const png_byte png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0};
/* Offset to next interlace block */
- static PNG_CONST png_byte png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
+ static const png_byte png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
/* Start of interlace block in the y direction */
- static PNG_CONST png_byte png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1};
+ static const png_byte png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1};
/* Offset to next interlace block in the y direction */
- static PNG_CONST png_byte png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2};
+ static const png_byte png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2};
- int max_pixel_depth;
- png_size_t row_bytes;
+ unsigned int max_pixel_depth;
+ size_t row_bytes;
png_debug(1, "in png_read_start_row");
@@ -4283,7 +4433,7 @@
png_ptr->iwidth = png_ptr->width;
}
- max_pixel_depth = png_ptr->pixel_depth;
+ max_pixel_depth = (unsigned int)png_ptr->pixel_depth;
/* WARNING: * png_read_transform_info (pngrtran.c) performs a simpler set of
* calculations to calculate the final pixel depth, then
@@ -4418,7 +4568,7 @@
defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
if ((png_ptr->transformations & PNG_USER_TRANSFORM) != 0)
{
- int user_pixel_depth = png_ptr->user_transform_depth *
+ unsigned int user_pixel_depth = png_ptr->user_transform_depth *
png_ptr->user_transform_channels;
if (user_pixel_depth > max_pixel_depth)
@@ -4440,7 +4590,7 @@
* for safety's sake
*/
row_bytes = PNG_ROWBYTES(max_pixel_depth, row_bytes) +
- 1 + ((max_pixel_depth + 7) >> 3);
+ 1 + ((max_pixel_depth + 7) >> 3U);
#ifdef PNG_MAX_MALLOC_64K
if (row_bytes > (png_uint_32)65536L)
@@ -4509,7 +4659,7 @@
* does not, so free the read buffer now regardless; the sequential reader
* reallocates it on demand.
*/
- if (png_ptr->read_buffer != 0)
+ if (png_ptr->read_buffer != NULL)
{
png_bytep buffer = png_ptr->read_buffer;
diff --git a/pngset.c b/pngset.c
index cccd9cd..ec75dbe 100644
--- a/pngset.c
+++ b/pngset.c
@@ -1,10 +1,10 @@
/* pngset.c - storage of image information into info struct
*
- * Last changed in libpng 1.6.24 [August 4, 2016]
- * Copyright (c) 1998-2016 Glenn Randers-Pehrson
- * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
- * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
+ * Copyright (c) 2018 Cosmin Truta
+ * Copyright (c) 1998-2018 Glenn Randers-Pehrson
+ * Copyright (c) 1996-1997 Andreas Dilger
+ * Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
@@ -134,6 +134,53 @@
#endif /* cHRM */
+#ifdef PNG_eXIf_SUPPORTED
+void PNGAPI
+png_set_eXIf(png_const_structrp png_ptr, png_inforp info_ptr,
+ png_bytep eXIf_buf)
+{
+ png_warning(png_ptr, "png_set_eXIf does not work; use png_set_eXIf_1");
+ PNG_UNUSED(info_ptr)
+ PNG_UNUSED(eXIf_buf)
+}
+
+void PNGAPI
+png_set_eXIf_1(png_const_structrp png_ptr, png_inforp info_ptr,
+ png_uint_32 num_exif, png_bytep eXIf_buf)
+{
+ int i;
+
+ png_debug1(1, "in %s storage function", "eXIf");
+
+ if (png_ptr == NULL || info_ptr == NULL)
+ return;
+
+ if (info_ptr->exif)
+ {
+ png_free(png_ptr, info_ptr->exif);
+ info_ptr->exif = NULL;
+ }
+
+ info_ptr->num_exif = num_exif;
+
+ info_ptr->exif = png_voidcast(png_bytep, png_malloc_warn(png_ptr,
+ info_ptr->num_exif));
+
+ if (info_ptr->exif == NULL)
+ {
+ png_warning(png_ptr, "Insufficient memory for eXIf chunk data");
+ return;
+ }
+
+ info_ptr->free_me |= PNG_FREE_EXIF;
+
+ for (i = 0; i < (int) info_ptr->num_exif; i++)
+ info_ptr->exif[i] = eXIf_buf[i];
+
+ info_ptr->valid |= PNG_INFO_eXIf;
+}
+#endif /* eXIf */
+
#ifdef PNG_gAMA_SUPPORTED
void PNGFAPI
png_set_gAMA_fixed(png_const_structrp png_ptr, png_inforp info_ptr,
@@ -266,7 +313,7 @@
png_const_charp purpose, png_int_32 X0, png_int_32 X1, int type,
int nparams, png_const_charp units, png_charpp params)
{
- png_size_t length;
+ size_t length;
int i;
png_debug1(1, "in %s storage function", "pCAL");
@@ -283,17 +330,29 @@
/* Check that the type matches the specification. */
if (type < 0 || type > 3)
- png_error(png_ptr, "Invalid pCAL equation type");
+ {
+ png_chunk_report(png_ptr, "Invalid pCAL equation type",
+ PNG_CHUNK_WRITE_ERROR);
+ return;
+ }
if (nparams < 0 || nparams > 255)
- png_error(png_ptr, "Invalid pCAL parameter count");
+ {
+ png_chunk_report(png_ptr, "Invalid pCAL parameter count",
+ PNG_CHUNK_WRITE_ERROR);
+ return;
+ }
/* Validate params[nparams] */
for (i=0; i<nparams; ++i)
{
if (params[i] == NULL ||
!png_check_fp_string(params[i], strlen(params[i])))
- png_error(png_ptr, "Invalid format for pCAL parameter");
+ {
+ png_chunk_report(png_ptr, "Invalid format for pCAL parameter",
+ PNG_CHUNK_WRITE_ERROR);
+ return;
+ }
}
info_ptr->pcal_purpose = png_voidcast(png_charp,
@@ -301,8 +360,8 @@
if (info_ptr->pcal_purpose == NULL)
{
- png_warning(png_ptr, "Insufficient memory for pCAL purpose");
-
+ png_chunk_report(png_ptr, "Insufficient memory for pCAL purpose",
+ PNG_CHUNK_WRITE_ERROR);
return;
}
@@ -331,7 +390,7 @@
memcpy(info_ptr->pcal_units, units, length);
info_ptr->pcal_params = png_voidcast(png_charpp, png_malloc_warn(png_ptr,
- (png_size_t)((nparams + 1) * (sizeof (png_charp)))));
+ (size_t)(((unsigned int)nparams + 1) * (sizeof (png_charp)))));
if (info_ptr->pcal_params == NULL)
{
@@ -340,7 +399,8 @@
return;
}
- memset(info_ptr->pcal_params, 0, (nparams + 1) * (sizeof (png_charp)));
+ memset(info_ptr->pcal_params, 0, ((unsigned int)nparams + 1) *
+ (sizeof (png_charp)));
for (i = 0; i < nparams; i++)
{
@@ -370,7 +430,7 @@
png_set_sCAL_s(png_const_structrp png_ptr, png_inforp info_ptr,
int unit, png_const_charp swidth, png_const_charp sheight)
{
- png_size_t lengthw = 0, lengthh = 0;
+ size_t lengthw = 0, lengthh = 0;
png_debug1(1, "in %s storage function", "sCAL");
@@ -563,7 +623,8 @@
PNG_MAX_PALETTE_LENGTH * (sizeof (png_color))));
if (num_palette > 0)
- memcpy(png_ptr->palette, palette, num_palette * (sizeof (png_color)));
+ memcpy(png_ptr->palette, palette, (unsigned int)num_palette *
+ (sizeof (png_color)));
info_ptr->palette = png_ptr->palette;
info_ptr->num_palette = png_ptr->num_palette = (png_uint_16)num_palette;
@@ -630,7 +691,7 @@
{
png_charp new_iccp_name;
png_bytep new_iccp_profile;
- png_size_t length;
+ size_t length;
png_debug1(1, "in %s storage function", "iCCP");
@@ -957,7 +1018,7 @@
/* Changed from num_trans to PNG_MAX_PALETTE_LENGTH in version 1.2.1 */
info_ptr->trans_alpha = png_voidcast(png_bytep,
png_malloc(png_ptr, PNG_MAX_PALETTE_LENGTH));
- memcpy(info_ptr->trans_alpha, trans_alpha, (png_size_t)num_trans);
+ memcpy(info_ptr->trans_alpha, trans_alpha, (size_t)num_trans);
}
png_ptr->trans_alpha = info_ptr->trans_alpha;
}
@@ -1037,7 +1098,7 @@
do
{
- png_size_t length;
+ size_t length;
/* Skip invalid input entries */
if (entries->name == NULL || entries->entries == NULL)
@@ -1080,7 +1141,7 @@
* checked it when doing the allocation.
*/
memcpy(np->entries, entries->entries,
- entries->nentries * sizeof (png_sPLT_entry));
+ (unsigned int)entries->nentries * sizeof (png_sPLT_entry));
/* Note that 'continue' skips the advance of the out pointer and out
* count, so an invalid entry is not added.
@@ -1088,8 +1149,9 @@
info_ptr->valid |= PNG_INFO_sPLT;
++(info_ptr->splt_palettes_num);
++np;
+ ++entries;
}
- while (++entries, --nentries);
+ while (--nentries);
if (nentries > 0)
png_chunk_report(png_ptr, "sPLT out of memory", PNG_CHUNK_WRITE_ERROR);
@@ -1249,7 +1311,7 @@
{
png_app_error(png_ptr, "invalid unknown chunk location");
/* Fake out the pre 1.6.0 behavior: */
- if ((location & PNG_HAVE_IDAT) != 0) /* undocumented! */
+ if (((unsigned int)location & PNG_HAVE_IDAT) != 0) /* undocumented! */
location = PNG_AFTER_IDAT;
else
@@ -1337,9 +1399,10 @@
/* Ignore all unknown chunks and all chunks recognized by
* libpng except for IHDR, PLTE, tRNS, IDAT, and IEND
*/
- static PNG_CONST png_byte chunks_to_ignore[] = {
+ static const png_byte chunks_to_ignore[] = {
98, 75, 71, 68, '\0', /* bKGD */
99, 72, 82, 77, '\0', /* cHRM */
+ 101, 88, 73, 102, '\0', /* eXIf */
103, 65, 77, 65, '\0', /* gAMA */
104, 73, 83, 84, '\0', /* hIST */
105, 67, 67, 80, '\0', /* iCCP */
@@ -1373,7 +1436,7 @@
return;
}
- num_chunks = num_chunks_in;
+ num_chunks = (unsigned int)num_chunks_in;
}
old_num_chunks = png_ptr->num_chunk_list;
@@ -1500,7 +1563,7 @@
#endif
void PNGAPI
-png_set_compression_buffer_size(png_structrp png_ptr, png_size_t size)
+png_set_compression_buffer_size(png_structrp png_ptr, size_t size)
{
if (png_ptr == NULL)
return;
@@ -1563,7 +1626,7 @@
png_set_invalid(png_const_structrp png_ptr, png_inforp info_ptr, int mask)
{
if (png_ptr != NULL && info_ptr != NULL)
- info_ptr->valid &= ~mask;
+ info_ptr->valid &= (unsigned int)(~mask);
}
@@ -1682,14 +1745,16 @@
png_byte ch = (png_byte)*key++;
if ((ch > 32 && ch <= 126) || (ch >= 161 /*&& ch <= 255*/))
- *new_key++ = ch, ++key_len, space = 0;
+ {
+ *new_key++ = ch; ++key_len; space = 0;
+ }
else if (space == 0)
{
/* A space or an invalid character when one wasn't seen immediately
* before; output just a space.
*/
- *new_key++ = 32, ++key_len, space = 1;
+ *new_key++ = 32; ++key_len; space = 1;
/* If the character was not a space then it is invalid. */
if (ch != 32)
@@ -1702,7 +1767,7 @@
if (key_len > 0 && space != 0) /* trailing space */
{
- --key_len, --new_key;
+ --key_len; --new_key;
if (bad_character == 0)
bad_character = 32;
}
diff --git a/pngstruct.h b/pngstruct.h
index 2b0eb49..8bdc7ce 100644
--- a/pngstruct.h
+++ b/pngstruct.h
@@ -1,10 +1,10 @@
/* pngstruct.h - header file for PNG reference library
*
- * Last changed in libpng 1.6.24 [August 4, 2016]
- * Copyright (c) 1998-2002,2004,2006-2016 Glenn Randers-Pehrson
- * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
- * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
+ * Copyright (c) 2018-2019 Cosmin Truta
+ * Copyright (c) 1998-2002,2004,2006-2018 Glenn Randers-Pehrson
+ * Copyright (c) 1996-1997 Andreas Dilger
+ * Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
@@ -47,7 +47,7 @@
/* zlib.h declares a magic type 'uInt' that limits the amount of data that zlib
* can handle at once. This type need be no larger than 16 bits (so maximum of
* 65535), this define allows us to discover how big it is, but limited by the
- * maximuum for png_size_t. The value can be overriden in a library build
+ * maximum for size_t. The value can be overridden in a library build
* (pngusr.h, or set it in CPPFLAGS) and it works to set it to a considerably
* lower value (e.g. 255 works). A lower value may help memory usage (slightly)
* and may even improve performance on some systems (and degrade it on others.)
@@ -214,7 +214,7 @@
png_uint_32 height; /* height of image in pixels */
png_uint_32 num_rows; /* number of rows in current pass */
png_uint_32 usr_width; /* width of row at start of write */
- png_size_t rowbytes; /* size of row in bytes */
+ size_t rowbytes; /* size of row in bytes */
png_uint_32 iwidth; /* width of current interlaced row in pixels */
png_uint_32 row_number; /* current row in interlace pass */
png_uint_32 chunk_name; /* PNG_CHUNK() id of current chunk */
@@ -232,7 +232,7 @@
png_bytep try_row; /* buffer to save trial row when filtering */
png_bytep tst_row; /* buffer to save best trial row when filtering */
#endif
- png_size_t info_rowbytes; /* Added in 1.5.4: cache of updated row bytes */
+ size_t info_rowbytes; /* Added in 1.5.4: cache of updated row bytes */
png_uint_32 idat_size; /* current IDAT size for read */
png_uint_32 crc; /* current chunk CRC value */
@@ -263,7 +263,7 @@
/* pixel depth used for the row buffers */
png_byte transformed_pixel_depth;
/* pixel depth after read/write transforms */
-#if PNG_ZLIB_VERNUM >= 0x1240
+#if ZLIB_VERNUM >= 0x1240
png_byte zstream_start; /* at start of an input zlib stream */
#endif /* Zlib >= 1.2.4 */
#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
@@ -307,7 +307,7 @@
#endif
#if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
- png_color_8 shift; /* shift for significant bit tranformation */
+ png_color_8 shift; /* shift for significant bit transformation */
#endif
#if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \
@@ -328,10 +328,10 @@
png_bytep current_buffer; /* buffer for recently used data */
png_uint_32 push_length; /* size of current input chunk */
png_uint_32 skip_length; /* bytes to skip in input data */
- png_size_t save_buffer_size; /* amount of data now in save_buffer */
- png_size_t save_buffer_max; /* total size of save_buffer */
- png_size_t buffer_size; /* total amount of available input data */
- png_size_t current_buffer_size; /* amount of data now in current_buffer */
+ size_t save_buffer_size; /* amount of data now in save_buffer */
+ size_t save_buffer_max; /* total size of save_buffer */
+ size_t buffer_size; /* total amount of available input data */
+ size_t current_buffer_size; /* amount of data now in current_buffer */
int process_mode; /* what push library is currently doing */
int cur_palette; /* current push library palette index */
@@ -353,7 +353,7 @@
/* Options */
#ifdef PNG_SET_OPTION_SUPPORTED
- png_byte options; /* On/off state (up to 4 options) */
+ png_uint_32 options; /* On/off state (up to 16 options) */
#endif
#if PNG_LIBPNG_VER < 10700
@@ -392,6 +392,12 @@
/* deleted in 1.5.5: rgb_to_gray_blue_coeff; */
#endif
+/* New member added in libpng-1.6.36 */
+#if defined(PNG_READ_EXPAND_SUPPORTED) && \
+ defined(PNG_ARM_NEON_IMPLEMENTATION)
+ png_bytep riffled_palette; /* buffer for accelerated palette expansion */
+#endif
+
/* New member added in libpng-1.0.4 (renamed in 1.0.9) */
#if defined(PNG_MNG_FEATURES_SUPPORTED)
/* Changed from png_byte to png_uint_32 at version 1.2.0 */
@@ -451,7 +457,7 @@
#endif
/* New member added in libpng-1.2.26 */
- png_size_t old_big_row_buf_size;
+ size_t old_big_row_buf_size;
#ifdef PNG_READ_SUPPORTED
/* New member added in libpng-1.2.30 */
diff --git a/pngtest.c b/pngtest.c
index dd222a6..a715ae1 100644
--- a/pngtest.c
+++ b/pngtest.c
@@ -1,10 +1,10 @@
/* pngtest.c - a simple test program to test libpng
*
- * Last changed in libpng 1.6.24 [August 4, 2016]
- * Copyright (c) 1998-2002,2004,2006-2016 Glenn Randers-Pehrson
- * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
- * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
+ * Copyright (c) 2018-2019 Cosmin Truta
+ * Copyright (c) 1998-2002,2004,2006-2018 Glenn Randers-Pehrson
+ * Copyright (c) 1996-1997 Andreas Dilger
+ * Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
@@ -43,15 +43,6 @@
#include "png.h"
-/* 1.6.1 added support for the configure test harness, which uses 77 to indicate
- * a skipped test, in earlier versions we need to succeed on a skipped test, so:
- */
-#if PNG_LIBPNG_VER >= 10601 && defined(HAVE_CONFIG_H)
-# define SKIP 77
-#else
-# define SKIP 0
-#endif
-
/* Known chunks that exist in pngtest.png must be supported or pngtest will fail
* simply as a result of re-ordering them. This may be fixed in 1.7
*
@@ -153,6 +144,7 @@
static int verbose = 0;
static int strict = 0;
static int relaxed = 0;
+static int xfail = 0;
static int unsupported_chunks = 0; /* chunk unsupported by libpng in input */
static int error_count = 0; /* count calls to png_error */
static int warning_count = 0; /* count calls to png_warning */
@@ -353,10 +345,10 @@
#ifdef PNG_IO_STATE_SUPPORTED
void
-pngtest_check_io_state(png_structp png_ptr, png_size_t data_length,
+pngtest_check_io_state(png_structp png_ptr, size_t data_length,
png_uint_32 io_op);
void
-pngtest_check_io_state(png_structp png_ptr, png_size_t data_length,
+pngtest_check_io_state(png_structp png_ptr, size_t data_length,
png_uint_32 io_op)
{
png_uint_32 io_state = png_get_io_state(png_ptr);
@@ -394,12 +386,12 @@
#endif
static void PNGCBAPI
-pngtest_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
+pngtest_read_data(png_structp png_ptr, png_bytep data, size_t length)
{
- png_size_t check = 0;
+ size_t check = 0;
png_voidp io_ptr;
- /* fread() returns 0 on error, so it is OK to store this in a png_size_t
+ /* fread() returns 0 on error, so it is OK to store this in a size_t
* instead of an int, which is what fread() actually returns.
*/
io_ptr = png_get_io_ptr(png_ptr);
@@ -433,9 +425,9 @@
* than changing the library.
*/
static void PNGCBAPI
-pngtest_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
+pngtest_write_data(png_structp png_ptr, png_bytep data, size_t length)
{
- png_size_t check;
+ size_t check;
check = fwrite(data, 1, length, (png_FILE_p)png_get_io_ptr(png_ptr));
@@ -457,13 +449,13 @@
*/
typedef struct
{
- PNG_CONST char *file_name;
+ const char *file_name;
} pngtest_error_parameters;
static void PNGCBAPI
pngtest_warning(png_structp png_ptr, png_const_charp message)
{
- PNG_CONST char *name = "UNKNOWN (ERROR!)";
+ const char *name = "UNKNOWN (ERROR!)";
pngtest_error_parameters *test =
(pngtest_error_parameters*)png_get_error_ptr(png_ptr);
@@ -472,7 +464,7 @@
if (test != NULL && test->file_name != NULL)
name = test->file_name;
- fprintf(STDERR, "%s: libpng warning: %s\n", name, message);
+ fprintf(STDERR, "\n%s: libpng warning: %s\n", name, message);
}
/* This is the default error handling function. Note that replacements for
@@ -713,7 +705,7 @@
* The unknown chunk structure contains the chunk data:
* png_byte name[5];
* png_byte *data;
- * png_size_t size;
+ * size_t size;
*
* Note that libpng has already taken care of the CRC handling.
*/
@@ -858,7 +850,7 @@
/* Test one file */
static int
-test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
+test_one_file(const char *inname, const char *outname)
{
static png_FILE_p fpin;
static png_FILE_p fpout; /* "static" prevents setjmp corruption */
@@ -945,8 +937,12 @@
fprintf(STDERR, "%s -> %s: libpng read error\n", inname, outname);
png_free(read_ptr, row_buf);
row_buf = NULL;
+ if (verbose != 0)
+ fprintf(STDERR, " destroy read structs\n");
png_destroy_read_struct(&read_ptr, &read_info_ptr, &end_info_ptr);
#ifdef PNG_WRITE_SUPPORTED
+ if (verbose != 0)
+ fprintf(STDERR, " destroy write structs\n");
png_destroy_info_struct(write_ptr, &write_end_info_ptr);
png_destroy_write_struct(&write_ptr, &write_info_ptr);
#endif
@@ -961,11 +957,15 @@
if (setjmp(png_jmpbuf(write_ptr)))
{
fprintf(STDERR, "%s -> %s: libpng write error\n", inname, outname);
+ png_free(read_ptr, row_buf);
+ row_buf = NULL;
+ if (verbose != 0)
+ fprintf(STDERR, " destroying read structs\n");
png_destroy_read_struct(&read_ptr, &read_info_ptr, &end_info_ptr);
+ if (verbose != 0)
+ fprintf(STDERR, " destroying write structs\n");
png_destroy_info_struct(write_ptr, &write_end_info_ptr);
-#ifdef PNG_WRITE_SUPPORTED
png_destroy_write_struct(&write_ptr, &write_info_ptr);
-#endif
FCLOSE(fpin);
FCLOSE(fpout);
return (1);
@@ -973,15 +973,16 @@
#endif
#endif
+#ifdef PNG_BENIGN_ERRORS_SUPPORTED
if (strict != 0)
{
/* Treat png_benign_error() as errors on read */
png_set_benign_errors(read_ptr, 0);
-#ifdef PNG_WRITE_SUPPORTED
+# ifdef PNG_WRITE_SUPPORTED
/* Treat them as errors on write */
png_set_benign_errors(write_ptr, 0);
-#endif
+# endif
/* if strict is not set, then app warnings and errors are treated as
* warnings in release builds, but not in unstable builds; this can be
@@ -994,10 +995,20 @@
/* Allow application (pngtest) errors and warnings to pass */
png_set_benign_errors(read_ptr, 1);
-#ifdef PNG_WRITE_SUPPORTED
- png_set_benign_errors(write_ptr, 1);
+ /* Turn off CRC checking while reading */
+ png_set_crc_action(read_ptr, PNG_CRC_QUIET_USE, PNG_CRC_QUIET_USE);
+
+#ifdef PNG_IGNORE_ADLER32
+ /* Turn off ADLER32 checking while reading */
+ png_set_option(read_ptr, PNG_IGNORE_ADLER32, PNG_OPTION_ON);
#endif
+
+# ifdef PNG_WRITE_SUPPORTED
+ png_set_benign_errors(write_ptr, 1);
+# endif
+
}
+#endif /* BENIGN_ERRORS */
pngtest_debug("Initializing input and output streams");
#ifdef PNG_STDIO_SUPPORTED
@@ -1190,6 +1201,22 @@
}
}
#endif
+#ifdef PNG_READ_eXIf_SUPPORTED
+ {
+ png_bytep exif=NULL;
+ png_uint_32 exif_length;
+
+ if (png_get_eXIf_1(read_ptr, read_info_ptr, &exif_length, &exif) != 0)
+ {
+ if (exif_length > 1)
+ fprintf(STDERR," eXIf type %c%c, %lu bytes\n",exif[0],exif[1],
+ (unsigned long)exif_length);
+# ifdef PNG_WRITE_eXIf_SUPPORTED
+ png_set_eXIf_1(write_ptr, write_info_ptr, exif_length, exif);
+# endif
+ }
+ }
+#endif
#ifdef PNG_hIST_SUPPORTED
{
png_uint_16p hist;
@@ -1300,10 +1327,10 @@
{
int i;
- printf("\n");
+ fprintf(STDERR,"\n");
for (i=0; i<num_text; i++)
{
- printf(" Text compression[%d]=%d\n",
+ fprintf(STDERR," Text compression[%d]=%d\n",
i, text_ptr[i].compression);
}
}
@@ -1395,6 +1422,15 @@
png_write_info(write_ptr, write_info_ptr);
write_chunks(write_ptr, before_IDAT); /* after PLTE */
+
+ png_write_info(write_ptr, write_end_info_ptr);
+
+ write_chunks(write_ptr, after_IDAT); /* after IDAT */
+
+#ifdef PNG_COMPRESSION_COMPAT
+ /* Test the 'compatibility' setting here, if it is available. */
+ png_set_compression(write_ptr, PNG_COMPRESSION_COMPAT);
+#endif
#endif
#ifdef SINGLE_ROWBUF_ALLOC
@@ -1402,7 +1438,7 @@
row_buf = (png_bytep)png_malloc(read_ptr,
png_get_rowbytes(read_ptr, read_info_ptr));
- pngtest_debug1("\t0x%08lx", (unsigned long)row_buf);
+ pngtest_debug1("\t%p", row_buf);
#endif /* SINGLE_ROWBUF_ALLOC */
pngtest_debug("Writing row data");
@@ -1456,7 +1492,7 @@
row_buf = (png_bytep)png_malloc(read_ptr,
png_get_rowbytes(read_ptr, read_info_ptr));
- pngtest_debug2("\t0x%08lx (%lu bytes)", (unsigned long)row_buf,
+ pngtest_debug2("\t%p (%lu bytes)", row_buf,
(unsigned long)png_get_rowbytes(read_ptr, read_info_ptr));
#endif /* !SINGLE_ROWBUF_ALLOC */
@@ -1511,10 +1547,10 @@
{
int i;
- printf("\n");
+ fprintf(STDERR,"\n");
for (i=0; i<num_text; i++)
{
- printf(" Text compression[%d]=%d\n",
+ fprintf(STDERR," Text compression[%d]=%d\n",
i, text_ptr[i].compression);
}
}
@@ -1523,6 +1559,22 @@
}
}
#endif
+#ifdef PNG_READ_eXIf_SUPPORTED
+ {
+ png_bytep exif=NULL;
+ png_uint_32 exif_length;
+
+ if (png_get_eXIf_1(read_ptr, end_info_ptr, &exif_length, &exif) != 0)
+ {
+ if (exif_length > 1)
+ fprintf(STDERR," eXIf type %c%c, %lu bytes\n",exif[0],exif[1],
+ (unsigned long)exif_length);
+# ifdef PNG_WRITE_eXIf_SUPPORTED
+ png_set_eXIf_1(write_ptr, write_end_info_ptr, exif_length, exif);
+# endif
+ }
+ }
+#endif
#ifdef PNG_tIME_SUPPORTED
{
png_timep mod_time;
@@ -1676,7 +1728,7 @@
for (;;)
{
static int wrote_question = 0;
- png_size_t num_in, num_out;
+ size_t num_in, num_out;
char inbuf[256], outbuf[256];
num_in = fread(inbuf, 1, sizeof inbuf, fpin);
@@ -1759,11 +1811,11 @@
/* Input and output filenames */
#ifdef RISCOS
-static PNG_CONST char *inname = "pngtest/png";
-static PNG_CONST char *outname = "pngout/png";
+static const char *inname = "pngtest/png";
+static const char *outname = "pngout/png";
#else
-static PNG_CONST char *inname = "pngtest.png";
-static PNG_CONST char *outname = "pngout.png";
+static const char *inname = "pngtest.png";
+static const char *outname = "pngout.png";
#endif
int
@@ -1838,6 +1890,7 @@
inname = argv[2];
strict++;
relaxed = 0;
+ multiple=1;
}
else if (strcmp(argv[1], "--relaxed") == 0)
@@ -1847,6 +1900,17 @@
inname = argv[2];
strict = 0;
relaxed++;
+ multiple=1;
+ }
+ else if (strcmp(argv[1], "--xfail") == 0)
+ {
+ status_dots_requested = 0;
+ verbose = 1;
+ inname = argv[2];
+ strict = 0;
+ xfail++;
+ relaxed++;
+ multiple=1;
}
else
@@ -1904,8 +1968,13 @@
else
{
- fprintf(STDERR, " FAIL\n");
- ierror += kerror;
+ if (xfail)
+ fprintf(STDERR, " XFAIL\n");
+ else
+ {
+ fprintf(STDERR, " FAIL\n");
+ ierror += kerror;
+ }
}
#if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
if (allocation_now != current_allocation)
@@ -1993,8 +2062,13 @@
#endif
}
- fprintf(STDERR, " FAIL\n");
- ierror += kerror;
+ if (xfail)
+ fprintf(STDERR, " XFAIL\n");
+ else
+ {
+ fprintf(STDERR, " FAIL\n");
+ ierror += kerror;
+ }
}
#if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
if (allocation_now != current_allocation)
@@ -2076,9 +2150,9 @@
fprintf(STDERR,
" test ignored because libpng was not built with read support\n");
/* And skip this test */
- return SKIP;
+ return PNG_LIBPNG_VER < 10600 ? 0 : 77;
}
#endif
/* Generate a compiler error if there is an old png.h in the search path. */
-typedef png_libpng_version_1_6_24 Your_png_h_is_not_version_1_6_24;
+typedef png_libpng_version_1_6_37 Your_png_h_is_not_version_1_6_37;
diff --git a/pngtrans.c b/pngtrans.c
index e5cbd79..1100f46 100644
--- a/pngtrans.c
+++ b/pngtrans.c
@@ -1,10 +1,10 @@
/* pngtrans.c - transforms the data in a row (used by both readers and writers)
*
- * Last changed in libpng 1.6.24 [August 4, 2016]
- * Copyright (c) 1998-2002,2004,2006-2016 Glenn Randers-Pehrson
- * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
- * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
+ * Copyright (c) 2018 Cosmin Truta
+ * Copyright (c) 1998-2002,2004,2006-2018 Glenn Randers-Pehrson
+ * Copyright (c) 1996-1997 Andreas Dilger
+ * Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
@@ -269,8 +269,8 @@
if (row_info->color_type == PNG_COLOR_TYPE_GRAY)
{
png_bytep rp = row;
- png_size_t i;
- png_size_t istop = row_info->rowbytes;
+ size_t i;
+ size_t istop = row_info->rowbytes;
for (i = 0; i < istop; i++)
{
@@ -283,8 +283,8 @@
row_info->bit_depth == 8)
{
png_bytep rp = row;
- png_size_t i;
- png_size_t istop = row_info->rowbytes;
+ size_t i;
+ size_t istop = row_info->rowbytes;
for (i = 0; i < istop; i += 2)
{
@@ -298,8 +298,8 @@
row_info->bit_depth == 16)
{
png_bytep rp = row;
- png_size_t i;
- png_size_t istop = row_info->rowbytes;
+ size_t i;
+ size_t istop = row_info->rowbytes;
for (i = 0; i < istop; i += 4)
{
@@ -345,7 +345,7 @@
#endif
#if defined(PNG_READ_PACKSWAP_SUPPORTED)||defined(PNG_WRITE_PACKSWAP_SUPPORTED)
-static PNG_CONST png_byte onebppswaptable[256] = {
+static const png_byte onebppswaptable[256] = {
0x00, 0x80, 0x40, 0xC0, 0x20, 0xA0, 0x60, 0xE0,
0x10, 0x90, 0x50, 0xD0, 0x30, 0xB0, 0x70, 0xF0,
0x08, 0x88, 0x48, 0xC8, 0x28, 0xA8, 0x68, 0xE8,
@@ -380,7 +380,7 @@
0x1F, 0x9F, 0x5F, 0xDF, 0x3F, 0xBF, 0x7F, 0xFF
};
-static PNG_CONST png_byte twobppswaptable[256] = {
+static const png_byte twobppswaptable[256] = {
0x00, 0x40, 0x80, 0xC0, 0x10, 0x50, 0x90, 0xD0,
0x20, 0x60, 0xA0, 0xE0, 0x30, 0x70, 0xB0, 0xF0,
0x04, 0x44, 0x84, 0xC4, 0x14, 0x54, 0x94, 0xD4,
@@ -415,7 +415,7 @@
0x2F, 0x6F, 0xAF, 0xEF, 0x3F, 0x7F, 0xBF, 0xFF
};
-static PNG_CONST png_byte fourbppswaptable[256] = {
+static const png_byte fourbppswaptable[256] = {
0x00, 0x10, 0x20, 0x30, 0x40, 0x50, 0x60, 0x70,
0x80, 0x90, 0xA0, 0xB0, 0xC0, 0xD0, 0xE0, 0xF0,
0x01, 0x11, 0x21, 0x31, 0x41, 0x51, 0x61, 0x71,
@@ -514,11 +514,15 @@
if (at_start != 0) /* Skip initial filler */
++sp;
else /* Skip initial channel and, for sp, the filler */
- sp += 2, ++dp;
+ {
+ sp += 2; ++dp;
+ }
/* For a 1 pixel wide image there is nothing to do */
while (sp < ep)
- *dp++ = *sp, sp += 2;
+ {
+ *dp++ = *sp; sp += 2;
+ }
row_info->pixel_depth = 8;
}
@@ -528,10 +532,14 @@
if (at_start != 0) /* Skip initial filler */
sp += 2;
else /* Skip initial channel and, for sp, the filler */
- sp += 4, dp += 2;
+ {
+ sp += 4; dp += 2;
+ }
while (sp < ep)
- *dp++ = *sp++, *dp++ = *sp, sp += 3;
+ {
+ *dp++ = *sp++; *dp++ = *sp; sp += 3;
+ }
row_info->pixel_depth = 16;
}
@@ -554,11 +562,15 @@
if (at_start != 0) /* Skip initial filler */
++sp;
else /* Skip initial channels and, for sp, the filler */
- sp += 4, dp += 3;
+ {
+ sp += 4; dp += 3;
+ }
/* Note that the loop adds 3 to dp and 4 to sp each time. */
while (sp < ep)
- *dp++ = *sp++, *dp++ = *sp++, *dp++ = *sp, sp += 2;
+ {
+ *dp++ = *sp++; *dp++ = *sp++; *dp++ = *sp; sp += 2;
+ }
row_info->pixel_depth = 24;
}
@@ -568,14 +580,16 @@
if (at_start != 0) /* Skip initial filler */
sp += 2;
else /* Skip initial channels and, for sp, the filler */
- sp += 8, dp += 6;
+ {
+ sp += 8; dp += 6;
+ }
while (sp < ep)
{
/* Copy 6 bytes, skip 2 */
- *dp++ = *sp++, *dp++ = *sp++;
- *dp++ = *sp++, *dp++ = *sp++;
- *dp++ = *sp++, *dp++ = *sp, sp += 3;
+ *dp++ = *sp++; *dp++ = *sp++;
+ *dp++ = *sp++; *dp++ = *sp++;
+ *dp++ = *sp++; *dp++ = *sp; sp += 3;
}
row_info->pixel_depth = 48;
@@ -595,7 +609,7 @@
return; /* The filler channel has gone already */
/* Fix the rowbytes value. */
- row_info->rowbytes = dp-row;
+ row_info->rowbytes = (size_t)(dp-row);
}
#endif
@@ -693,8 +707,8 @@
* and this calculation is used because it avoids warnings that other
* forms produced on either GCC or MSVC.
*/
- int padding = (-row_info->pixel_depth * row_info->width) & 7;
- png_bytep rp = png_ptr->row_buf + row_info->rowbytes;
+ int padding = PNG_PADBITS(row_info->pixel_depth, row_info->width);
+ png_bytep rp = png_ptr->row_buf + row_info->rowbytes - 1;
switch (row_info->bit_depth)
{
diff --git a/pngwio.c b/pngwio.c
index 37c7c3a..10e919d 100644
--- a/pngwio.c
+++ b/pngwio.c
@@ -1,10 +1,10 @@
/* pngwio.c - functions for data output
*
- * Last changed in libpng 1.6.24 [August 4, 2016]
- * Copyright (c) 1998-2002,2004,2006-2014,2016 Glenn Randers-Pehrson
- * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
- * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
+ * Copyright (c) 2018 Cosmin Truta
+ * Copyright (c) 1998-2002,2004,2006-2014,2016,2018 Glenn Randers-Pehrson
+ * Copyright (c) 1996-1997 Andreas Dilger
+ * Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
@@ -30,7 +30,7 @@
*/
void /* PRIVATE */
-png_write_data(png_structrp png_ptr, png_const_bytep data, png_size_t length)
+png_write_data(png_structrp png_ptr, png_const_bytep data, size_t length)
{
/* NOTE: write_data_fn must not change the buffer! */
if (png_ptr->write_data_fn != NULL )
@@ -48,9 +48,9 @@
* than changing the library.
*/
void PNGCBAPI
-png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
+png_default_write_data(png_structp png_ptr, png_bytep data, size_t length)
{
- png_size_t check;
+ size_t check;
if (png_ptr == NULL)
return;
diff --git a/pngwrite.c b/pngwrite.c
index aaa2b01..59377a4 100644
--- a/pngwrite.c
+++ b/pngwrite.c
@@ -1,10 +1,10 @@
/* pngwrite.c - general routines to write a PNG file
*
- * Last changed in libpng 1.6.24 [August 4, 2016]
- * Copyright (c) 1998-2002,2004,2006-2016 Glenn Randers-Pehrson
- * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
- * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
+ * Copyright (c) 2018-2019 Cosmin Truta
+ * Copyright (c) 1998-2002,2004,2006-2018 Glenn Randers-Pehrson
+ * Copyright (c) 1996-1997 Andreas Dilger
+ * Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
@@ -237,6 +237,11 @@
png_write_bKGD(png_ptr, &(info_ptr->background), info_ptr->color_type);
#endif
+#ifdef PNG_WRITE_eXIf_SUPPORTED
+ if ((info_ptr->valid & PNG_INFO_eXIf) != 0)
+ png_write_eXIf(png_ptr, info_ptr->exif, info_ptr->num_exif);
+#endif
+
#ifdef PNG_WRITE_hIST_SUPPORTED
if ((info_ptr->valid & PNG_INFO_hIST) != 0)
png_write_hIST(png_ptr, info_ptr->hist, info_ptr->num_palette);
@@ -432,6 +437,12 @@
}
}
#endif
+
+#ifdef PNG_WRITE_eXIf_SUPPORTED
+ if ((info_ptr->valid & PNG_INFO_eXIf) != 0)
+ png_write_eXIf(png_ptr, info_ptr->exif, info_ptr->num_exif);
+#endif
+
#ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
write_unknown_chunks(png_ptr, info_ptr, PNG_AFTER_IDAT);
#endif
@@ -458,7 +469,7 @@
#ifdef PNG_CONVERT_tIME_SUPPORTED
void PNGAPI
-png_convert_from_struct_tm(png_timep ptime, PNG_CONST struct tm * ttime)
+png_convert_from_struct_tm(png_timep ptime, const struct tm * ttime)
{
png_debug(1, "in png_convert_from_struct_tm");
@@ -666,9 +677,9 @@
for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel)
{
- png_uint_32 s0 = (*(rp ) << 8) | *(rp + 1);
- png_uint_32 s1 = (*(rp + 2) << 8) | *(rp + 3);
- png_uint_32 s2 = (*(rp + 4) << 8) | *(rp + 5);
+ png_uint_32 s0 = (png_uint_32)(*(rp ) << 8) | *(rp + 1);
+ png_uint_32 s1 = (png_uint_32)(*(rp + 2) << 8) | *(rp + 3);
+ png_uint_32 s2 = (png_uint_32)(*(rp + 4) << 8) | *(rp + 5);
png_uint_32 red = (png_uint_32)((s0 - s1) & 0xffffL);
png_uint_32 blue = (png_uint_32)((s2 - s1) & 0xffffL);
*(rp ) = (png_byte)(red >> 8);
@@ -901,7 +912,7 @@
if (png_ptr == NULL)
return;
- png_ptr->flush_dist = (nrows < 0 ? 0 : nrows);
+ png_ptr->flush_dist = (nrows < 0 ? 0 : (png_uint_32)nrows);
}
/* Flush the current output buffers now */
@@ -1007,8 +1018,8 @@
case 5:
case 6:
case 7: png_app_error(png_ptr, "Unknown row filter for method 0");
- /* FALL THROUGH */
#endif /* WRITE_FILTER */
+ /* FALLTHROUGH */
case PNG_FILTER_VALUE_NONE:
png_ptr->do_filter = PNG_FILTER_NONE; break;
@@ -1525,7 +1536,8 @@
display->first_row);
png_uint_16p output_row = png_voidcast(png_uint_16p, display->local_row);
png_uint_16p row_end;
- const int channels = (image->format & PNG_FORMAT_FLAG_COLOR) != 0 ? 3 : 1;
+ unsigned int channels = (image->format & PNG_FORMAT_FLAG_COLOR) != 0 ?
+ 3 : 1;
int aindex = 0;
png_uint_32 y = image->height;
@@ -1539,9 +1551,9 @@
++output_row;
}
else
- aindex = channels;
+ aindex = (int)channels;
# else
- aindex = channels;
+ aindex = (int)channels;
# endif
}
@@ -1554,14 +1566,14 @@
*/
row_end = output_row + image->width * (channels+1);
- while (y-- > 0)
+ for (; y > 0; --y)
{
png_const_uint_16p in_ptr = input_row;
png_uint_16p out_ptr = output_row;
while (out_ptr < row_end)
{
- const png_uint_16 alpha = in_ptr[aindex];
+ png_uint_16 alpha = in_ptr[aindex];
png_uint_32 reciprocal = 0;
int c;
@@ -1575,7 +1587,7 @@
if (alpha > 0 && alpha < 65535)
reciprocal = ((0xffff<<15)+(alpha>>1))/alpha;
- c = channels;
+ c = (int)channels;
do /* always at least one channel */
{
png_uint_16 component = *in_ptr++;
@@ -1610,7 +1622,7 @@
}
png_write_row(png_ptr, png_voidcast(png_const_bytep, display->local_row));
- input_row += display->row_bytes/(sizeof (png_uint_16));
+ input_row += (png_uint_16)display->row_bytes/(sizeof (png_uint_16));
}
return 1;
@@ -1624,7 +1636,7 @@
* calculation can be done to 15 bits of accuracy; however, the output needs to
* be scaled in the range 0..255*65535, so include that scaling here.
*/
-# define UNP_RECIPROCAL(alpha) ((((0xffff*0xff)<<7)+(alpha>>1))/alpha)
+# define UNP_RECIPROCAL(alpha) ((((0xffff*0xff)<<7)+((alpha)>>1))/(alpha))
static png_byte
png_unpremultiply(png_uint_32 component, png_uint_32 alpha,
@@ -1683,7 +1695,8 @@
display->first_row);
png_bytep output_row = png_voidcast(png_bytep, display->local_row);
png_uint_32 y = image->height;
- const int channels = (image->format & PNG_FORMAT_FLAG_COLOR) != 0 ? 3 : 1;
+ unsigned int channels = (image->format & PNG_FORMAT_FLAG_COLOR) != 0 ?
+ 3 : 1;
if ((image->format & PNG_FORMAT_FLAG_ALPHA) != 0)
{
@@ -1700,12 +1713,12 @@
else
# endif
- aindex = channels;
+ aindex = (int)channels;
/* Use row_end in place of a loop counter: */
row_end = output_row + image->width * (channels+1);
- while (y-- > 0)
+ for (; y > 0; --y)
{
png_const_uint_16p in_ptr = input_row;
png_bytep out_ptr = output_row;
@@ -1723,7 +1736,7 @@
if (alphabyte > 0 && alphabyte < 255)
reciprocal = UNP_RECIPROCAL(alpha);
- c = channels;
+ c = (int)channels;
do /* always at least one channel */
*out_ptr++ = png_unpremultiply(*in_ptr++, alpha, reciprocal);
while (--c > 0);
@@ -1735,7 +1748,7 @@
png_write_row(png_ptr, png_voidcast(png_const_bytep,
display->local_row));
- input_row += display->row_bytes/(sizeof (png_uint_16));
+ input_row += (png_uint_16)display->row_bytes/(sizeof (png_uint_16));
} /* while y */
}
@@ -1746,7 +1759,7 @@
*/
png_bytep row_end = output_row + image->width * channels;
- while (y-- > 0)
+ for (; y > 0; --y)
{
png_const_uint_16p in_ptr = input_row;
png_bytep out_ptr = output_row;
@@ -1760,7 +1773,7 @@
}
png_write_row(png_ptr, output_row);
- input_row += display->row_bytes/(sizeof (png_uint_16));
+ input_row += (png_uint_16)display->row_bytes/(sizeof (png_uint_16));
}
}
@@ -1770,25 +1783,25 @@
static void
png_image_set_PLTE(png_image_write_control *display)
{
- const png_imagep image = display->image;
+ png_imagep image = display->image;
const void *cmap = display->colormap;
- const int entries = image->colormap_entries > 256 ? 256 :
+ int entries = image->colormap_entries > 256 ? 256 :
(int)image->colormap_entries;
/* NOTE: the caller must check for cmap != NULL and entries != 0 */
- const png_uint_32 format = image->format;
- const int channels = PNG_IMAGE_SAMPLE_CHANNELS(format);
+ png_uint_32 format = image->format;
+ unsigned int channels = PNG_IMAGE_SAMPLE_CHANNELS(format);
# if defined(PNG_FORMAT_BGR_SUPPORTED) &&\
defined(PNG_SIMPLIFIED_WRITE_AFIRST_SUPPORTED)
- const int afirst = (format & PNG_FORMAT_FLAG_AFIRST) != 0 &&
+ int afirst = (format & PNG_FORMAT_FLAG_AFIRST) != 0 &&
(format & PNG_FORMAT_FLAG_ALPHA) != 0;
# else
# define afirst 0
# endif
# ifdef PNG_FORMAT_BGR_SUPPORTED
- const int bgr = (format & PNG_FORMAT_FLAG_BGR) != 0 ? 2 : 0;
+ int bgr = (format & PNG_FORMAT_FLAG_BGR) != 0 ? 2 : 0;
# else
# define bgr 0
# endif
@@ -1809,7 +1822,7 @@
{
png_const_uint_16p entry = png_voidcast(png_const_uint_16p, cmap);
- entry += i * channels;
+ entry += (unsigned int)i * channels;
if ((channels & 1) != 0) /* no alpha */
{
@@ -1865,7 +1878,7 @@
{
png_const_bytep entry = png_voidcast(png_const_bytep, cmap);
- entry += i * channels;
+ entry += (unsigned int)i * channels;
switch (channels)
{
@@ -1873,7 +1886,7 @@
tRNS[i] = entry[afirst ? 0 : 3];
if (tRNS[i] < 255)
num_trans = i+1;
- /* FALL THROUGH */
+ /* FALLTHROUGH */
case 3:
palette[i].blue = entry[afirst + (2 ^ bgr)];
palette[i].green = entry[afirst + 1];
@@ -1884,7 +1897,7 @@
tRNS[i] = entry[1 ^ afirst];
if (tRNS[i] < 255)
num_trans = i+1;
- /* FALL THROUGH */
+ /* FALLTHROUGH */
case 1:
palette[i].blue = palette[i].red = palette[i].green =
entry[afirst];
@@ -1910,7 +1923,7 @@
png_set_tRNS(image->opaque->png_ptr, image->opaque->info_ptr, tRNS,
num_trans, NULL);
- image->colormap_entries = entries;
+ image->colormap_entries = (png_uint_32)entries;
}
static int
@@ -1927,7 +1940,7 @@
int colormap = (format & PNG_FORMAT_FLAG_COLORMAP);
int linear = !colormap && (format & PNG_FORMAT_FLAG_LINEAR); /* input */
int alpha = !colormap && (format & PNG_FORMAT_FLAG_ALPHA);
- int write_16bit = linear && !colormap && (display->convert_to_8bit == 0);
+ int write_16bit = linear && (display->convert_to_8bit == 0);
# ifdef PNG_BENIGN_ERRORS_SUPPORTED
/* Make sure we error out on any bad situation */
@@ -1938,21 +1951,21 @@
* and total image size to ensure that they are within the system limits.
*/
{
- const unsigned int channels = PNG_IMAGE_PIXEL_CHANNELS(image->format);
+ unsigned int channels = PNG_IMAGE_PIXEL_CHANNELS(image->format);
- if (image->width <= 0x7FFFFFFFU/channels) /* no overflow */
+ if (image->width <= 0x7fffffffU/channels) /* no overflow */
{
png_uint_32 check;
- const png_uint_32 png_row_stride = image->width * channels;
+ png_uint_32 png_row_stride = image->width * channels;
if (display->row_stride == 0)
display->row_stride = (png_int_32)/*SAFE*/png_row_stride;
if (display->row_stride < 0)
- check = -display->row_stride;
+ check = (png_uint_32)(-display->row_stride);
else
- check = display->row_stride;
+ check = (png_uint_32)display->row_stride;
if (check >= png_row_stride)
{
@@ -1960,7 +1973,7 @@
* limits the whole image size to 32 bits for API compatibility with
* the current, 32-bit, PNG_IMAGE_BUFFER_SIZE macro.
*/
- if (image->height > 0xFFFFFFFF/png_row_stride)
+ if (image->height > 0xffffffffU/png_row_stride)
png_error(image->opaque->png_ptr, "memory image too large");
}
@@ -2039,7 +2052,7 @@
*/
if (write_16bit != 0)
{
- PNG_CONST png_uint_16 le = 0x0001;
+ png_uint_16 le = 0x0001;
if ((*(png_const_bytep) & le) != 0)
png_set_swap(png_ptr);
@@ -2136,7 +2149,7 @@
ptrdiff_t row_bytes = display->row_bytes;
png_uint_32 y = image->height;
- while (y-- > 0)
+ for (; y > 0; --y)
{
png_write_row(png_ptr, row);
row += row_bytes;
@@ -2149,12 +2162,11 @@
static void (PNGCBAPI
-image_memory_write)(png_structp png_ptr, png_bytep/*const*/ data,
- png_size_t size)
+image_memory_write)(png_structp png_ptr, png_bytep/*const*/ data, size_t size)
{
png_image_write_control *display = png_voidcast(png_image_write_control*,
png_ptr->io_ptr/*backdoor: png_get_io_ptr(png_ptr)*/);
- const png_alloc_size_t ob = display->output_bytes;
+ png_alloc_size_t ob = display->output_bytes;
/* Check for overflow; this should never happen: */
if (size <= ((png_alloc_size_t)-1) - ob)
diff --git a/pngwtran.c b/pngwtran.c
index 423fb2d..49a13c1 100644
--- a/pngwtran.c
+++ b/pngwtran.c
@@ -1,10 +1,10 @@
/* pngwtran.c - transforms the data in a row for PNG writers
*
- * Last changed in libpng 1.6.24 [August 4, 2016]
- * Copyright (c) 1998-2002,2004,2006-2016 Glenn Randers-Pehrson
- * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
- * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
+ * Copyright (c) 2018 Cosmin Truta
+ * Copyright (c) 1998-2002,2004,2006-2016,2018 Glenn Randers-Pehrson
+ * Copyright (c) 1996-1997 Andreas Dilger
+ * Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
@@ -177,7 +177,7 @@
if (row_info->color_type != PNG_COLOR_TYPE_PALETTE)
{
int shift_start[4], shift_dec[4];
- int channels = 0;
+ unsigned int channels = 0;
if ((row_info->color_type & PNG_COLOR_MASK_COLOR) != 0)
{
@@ -212,9 +212,9 @@
if (row_info->bit_depth < 8)
{
png_bytep bp = row;
- png_size_t i;
+ size_t i;
unsigned int mask;
- png_size_t row_bytes = row_info->rowbytes;
+ size_t row_bytes = row_info->rowbytes;
if (bit_depth->gray == 1 && row_info->bit_depth == 2)
mask = 0x55;
@@ -254,8 +254,7 @@
for (i = 0; i < istop; i++, bp++)
{
-
- const unsigned int c = i%channels;
+ unsigned int c = i%channels;
int j;
unsigned int v, out;
@@ -283,7 +282,7 @@
for (bp = row, i = 0; i < istop; i++)
{
- const unsigned int c = i%channels;
+ unsigned int c = i%channels;
int j;
unsigned int value, v;
@@ -514,7 +513,7 @@
(png_ptr, /* png_ptr */
row_info, /* row_info: */
/* png_uint_32 width; width of row */
- /* png_size_t rowbytes; number of bytes in row */
+ /* size_t rowbytes; number of bytes in row */
/* png_byte color_type; color type of pixels */
/* png_byte bit_depth; bit depth of samples */
/* png_byte channels; number of channels (1-4) */
diff --git a/pngwutil.c b/pngwutil.c
index 3f1ed0c..16345e4 100644
--- a/pngwutil.c
+++ b/pngwutil.c
@@ -1,10 +1,10 @@
/* pngwutil.c - utilities to write a PNG file
*
- * Last changed in libpng 1.6.24 [August 4, 2016]
- * Copyright (c) 1998-2002,2004,2006-2016 Glenn Randers-Pehrson
- * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
- * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
+ * Copyright (c) 2018 Cosmin Truta
+ * Copyright (c) 1998-2002,2004,2006-2018 Glenn Randers-Pehrson
+ * Copyright (c) 1996-1997 Andreas Dilger
+ * Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
@@ -59,7 +59,7 @@
/* Write the rest of the 8 byte signature */
png_write_data(png_ptr, &png_signature[png_ptr->sig_bytes],
- (png_size_t)(8 - png_ptr->sig_bytes));
+ (size_t)(8 - png_ptr->sig_bytes));
if (png_ptr->sig_bytes < 3)
png_ptr->mode |= PNG_HAVE_PNG_SIGNATURE;
@@ -124,8 +124,7 @@
* given to png_write_chunk_header().
*/
void PNGAPI
-png_write_chunk_data(png_structrp png_ptr, png_const_bytep data,
- png_size_t length)
+png_write_chunk_data(png_structrp png_ptr, png_const_bytep data, size_t length)
{
/* Write the data, and run the CRC over it */
if (png_ptr == NULL)
@@ -160,7 +159,7 @@
/* Write the crc in a single operation */
png_save_uint_32(buf, png_ptr->crc);
- png_write_data(png_ptr, buf, (png_size_t)4);
+ png_write_data(png_ptr, buf, 4);
}
/* Write a PNG chunk all at once. The type is an array of ASCII characters
@@ -174,7 +173,7 @@
*/
static void
png_write_complete_chunk(png_structrp png_ptr, png_uint_32 chunk_name,
- png_const_bytep data, png_size_t length)
+ png_const_bytep data, size_t length)
{
if (png_ptr == NULL)
return;
@@ -191,7 +190,7 @@
/* This is the API that calls the internal function above. */
void PNGAPI
png_write_chunk(png_structrp png_ptr, png_const_bytep chunk_string,
- png_const_bytep data, png_size_t length)
+ png_const_bytep data, size_t length)
{
png_write_complete_chunk(png_ptr, PNG_CHUNK_FROM_STRING(chunk_string), data,
length);
@@ -408,7 +407,7 @@
png_ptr->zstream.avail_out = 0;
/* Now initialize if required, setting the new parameters, otherwise just
- * to a simple reset to the previous parameters.
+ * do a simple reset to the previous parameters.
*/
if ((png_ptr->flags & PNG_FLAG_ZSTREAM_INITIALIZED) != 0)
ret = deflateReset(&png_ptr->zstream);
@@ -675,6 +674,7 @@
int interlace_type)
{
png_byte buf[13]; /* Buffer to store the IHDR info */
+ int is_invalid_depth;
png_debug(1, "in png_write_IHDR");
@@ -700,11 +700,11 @@
break;
case PNG_COLOR_TYPE_RGB:
+ is_invalid_depth = (bit_depth != 8);
#ifdef PNG_WRITE_16BIT_SUPPORTED
- if (bit_depth != 8 && bit_depth != 16)
-#else
- if (bit_depth != 8)
+ is_invalid_depth = (is_invalid_depth && bit_depth != 16);
#endif
+ if (is_invalid_depth)
png_error(png_ptr, "Invalid bit depth for RGB image");
png_ptr->channels = 3;
@@ -726,18 +726,22 @@
break;
case PNG_COLOR_TYPE_GRAY_ALPHA:
- if (bit_depth != 8 && bit_depth != 16)
+ is_invalid_depth = (bit_depth != 8);
+#ifdef PNG_WRITE_16BIT_SUPPORTED
+ is_invalid_depth = (is_invalid_depth && bit_depth != 16);
+#endif
+ if (is_invalid_depth)
png_error(png_ptr, "Invalid bit depth for grayscale+alpha image");
png_ptr->channels = 2;
break;
case PNG_COLOR_TYPE_RGB_ALPHA:
+ is_invalid_depth = (bit_depth != 8);
#ifdef PNG_WRITE_16BIT_SUPPORTED
- if (bit_depth != 8 && bit_depth != 16)
-#else
- if (bit_depth != 8)
+ is_invalid_depth = (is_invalid_depth && bit_depth != 16);
#endif
+ if (is_invalid_depth)
png_error(png_ptr, "Invalid bit depth for RGBA image");
png_ptr->channels = 4;
@@ -815,7 +819,7 @@
buf[12] = (png_byte)interlace_type;
/* Write the chunk */
- png_write_complete_chunk(png_ptr, png_IHDR, buf, (png_size_t)13);
+ png_write_complete_chunk(png_ptr, png_IHDR, buf, 13);
if ((png_ptr->do_filter) == PNG_NO_FILTERS)
{
@@ -884,7 +888,7 @@
buf[0] = pal_ptr->red;
buf[1] = pal_ptr->green;
buf[2] = pal_ptr->blue;
- png_write_chunk_data(png_ptr, buf, (png_size_t)3);
+ png_write_chunk_data(png_ptr, buf, 3);
}
#else
@@ -898,7 +902,7 @@
buf[0] = pal_ptr[i].red;
buf[1] = pal_ptr[i].green;
buf[2] = pal_ptr[i].blue;
- png_write_chunk_data(png_ptr, buf, (png_size_t)3);
+ png_write_chunk_data(png_ptr, buf, 3);
}
#endif
@@ -998,7 +1002,8 @@
optimize_cmf(data, png_image_size(png_ptr));
#endif
- png_write_complete_chunk(png_ptr, png_IDAT, data, size);
+ if (size > 0)
+ png_write_complete_chunk(png_ptr, png_IDAT, data, size);
png_ptr->mode |= PNG_HAVE_IDAT;
png_ptr->zstream.next_out = data;
@@ -1044,7 +1049,8 @@
optimize_cmf(data, png_image_size(png_ptr));
#endif
- png_write_complete_chunk(png_ptr, png_IDAT, data, size);
+ if (size > 0)
+ png_write_complete_chunk(png_ptr, png_IDAT, data, size);
png_ptr->zstream.avail_out = 0;
png_ptr->zstream.next_out = NULL;
png_ptr->mode |= PNG_HAVE_IDAT | PNG_AFTER_IDAT;
@@ -1068,7 +1074,7 @@
{
png_debug(1, "in png_write_IEND");
- png_write_complete_chunk(png_ptr, png_IEND, NULL, (png_size_t)0);
+ png_write_complete_chunk(png_ptr, png_IEND, NULL, 0);
png_ptr->mode |= PNG_HAVE_IEND;
}
@@ -1083,7 +1089,7 @@
/* file_gamma is saved in 1/100,000ths */
png_save_uint_32(buf, (png_uint_32)file_gamma);
- png_write_complete_chunk(png_ptr, png_gAMA, buf, (png_size_t)4);
+ png_write_complete_chunk(png_ptr, png_gAMA, buf, 4);
}
#endif
@@ -1101,7 +1107,7 @@
"Invalid sRGB rendering intent specified");
buf[0]=(png_byte)srgb_intent;
- png_write_complete_chunk(png_ptr, png_sRGB, buf, (png_size_t)1);
+ png_write_complete_chunk(png_ptr, png_sRGB, buf, 1);
}
#endif
@@ -1175,8 +1181,8 @@
png_uint_32 name_len;
png_byte new_name[80];
png_byte entrybuf[10];
- png_size_t entry_size = (spalette->depth == 8 ? 6 : 10);
- png_size_t palette_size = entry_size * spalette->nentries;
+ size_t entry_size = (spalette->depth == 8 ? 6 : 10);
+ size_t palette_size = entry_size * (size_t)spalette->nentries;
png_sPLT_entryp ep;
#ifndef PNG_POINTER_INDEXING_SUPPORTED
int i;
@@ -1193,10 +1199,9 @@
png_write_chunk_header(png_ptr, png_sPLT,
(png_uint_32)(name_len + 2 + palette_size));
- png_write_chunk_data(png_ptr, (png_bytep)new_name,
- (png_size_t)(name_len + 1));
+ png_write_chunk_data(png_ptr, (png_bytep)new_name, (size_t)(name_len + 1));
- png_write_chunk_data(png_ptr, &spalette->depth, (png_size_t)1);
+ png_write_chunk_data(png_ptr, &spalette->depth, 1);
/* Loop through each palette entry, writing appropriately */
#ifdef PNG_POINTER_INDEXING_SUPPORTED
@@ -1258,7 +1263,7 @@
png_write_sBIT(png_structrp png_ptr, png_const_color_8p sbit, int color_type)
{
png_byte buf[4];
- png_size_t size;
+ size_t size;
png_debug(1, "in png_write_sBIT");
@@ -1358,7 +1363,7 @@
/* Write the chunk out as it is */
png_write_complete_chunk(png_ptr, png_tRNS, trans_alpha,
- (png_size_t)num_trans);
+ (size_t)num_trans);
}
else if (color_type == PNG_COLOR_TYPE_GRAY)
@@ -1373,7 +1378,7 @@
}
png_save_uint_16(buf, tran->gray);
- png_write_complete_chunk(png_ptr, png_tRNS, buf, (png_size_t)2);
+ png_write_complete_chunk(png_ptr, png_tRNS, buf, 2);
}
else if (color_type == PNG_COLOR_TYPE_RGB)
@@ -1393,7 +1398,7 @@
return;
}
- png_write_complete_chunk(png_ptr, png_tRNS, buf, (png_size_t)6);
+ png_write_complete_chunk(png_ptr, png_tRNS, buf, 6);
}
else
@@ -1426,7 +1431,7 @@
}
buf[0] = back->index;
- png_write_complete_chunk(png_ptr, png_bKGD, buf, (png_size_t)1);
+ png_write_complete_chunk(png_ptr, png_bKGD, buf, 1);
}
else if ((color_type & PNG_COLOR_MASK_COLOR) != 0)
@@ -1447,7 +1452,7 @@
return;
}
- png_write_complete_chunk(png_ptr, png_bKGD, buf, (png_size_t)6);
+ png_write_complete_chunk(png_ptr, png_bKGD, buf, 6);
}
else
@@ -1461,11 +1466,33 @@
}
png_save_uint_16(buf, back->gray);
- png_write_complete_chunk(png_ptr, png_bKGD, buf, (png_size_t)2);
+ png_write_complete_chunk(png_ptr, png_bKGD, buf, 2);
}
}
#endif
+#ifdef PNG_WRITE_eXIf_SUPPORTED
+/* Write the Exif data */
+void /* PRIVATE */
+png_write_eXIf(png_structrp png_ptr, png_bytep exif, int num_exif)
+{
+ int i;
+ png_byte buf[1];
+
+ png_debug(1, "in png_write_eXIf");
+
+ png_write_chunk_header(png_ptr, png_eXIf, (png_uint_32)(num_exif));
+
+ for (i = 0; i < num_exif; i++)
+ {
+ buf[0] = exif[i];
+ png_write_chunk_data(png_ptr, buf, 1);
+ }
+
+ png_write_chunk_end(png_ptr);
+}
+#endif
+
#ifdef PNG_WRITE_hIST_SUPPORTED
/* Write the histogram */
void /* PRIVATE */
@@ -1490,7 +1517,7 @@
for (i = 0; i < num_hist; i++)
{
png_save_uint_16(buf, hist[i]);
- png_write_chunk_data(png_ptr, buf, (png_size_t)2);
+ png_write_chunk_data(png_ptr, buf, 2);
}
png_write_chunk_end(png_ptr);
@@ -1501,7 +1528,7 @@
/* Write a tEXt chunk */
void /* PRIVATE */
png_write_tEXt(png_structrp png_ptr, png_const_charp key, png_const_charp text,
- png_size_t text_len)
+ size_t text_len)
{
png_uint_32 key_len;
png_byte new_key[80];
@@ -1598,7 +1625,7 @@
png_const_charp lang, png_const_charp lang_key, png_const_charp text)
{
png_uint_32 key_len, prefix_len;
- png_size_t lang_len, lang_key_len;
+ size_t lang_len, lang_key_len;
png_byte new_key[82];
compression_state comp;
@@ -1708,7 +1735,7 @@
png_save_int_32(buf + 4, y_offset);
buf[8] = (png_byte)unit_type;
- png_write_complete_chunk(png_ptr, png_oFFs, buf, (png_size_t)9);
+ png_write_complete_chunk(png_ptr, png_oFFs, buf, 9);
}
#endif
#ifdef PNG_WRITE_pCAL_SUPPORTED
@@ -1719,7 +1746,7 @@
png_charpp params)
{
png_uint_32 purpose_len;
- png_size_t units_len, total_len;
+ size_t units_len, total_len;
png_size_tp params_len;
png_byte buf[10];
png_byte new_purpose[80];
@@ -1743,7 +1770,7 @@
total_len = purpose_len + units_len + 10;
params_len = (png_size_tp)png_malloc(png_ptr,
- (png_alloc_size_t)(nparams * (sizeof (png_size_t))));
+ (png_alloc_size_t)((png_alloc_size_t)nparams * (sizeof (size_t))));
/* Find the length of each parameter, making sure we don't count the
* null terminator for the last parameter.
@@ -1763,8 +1790,8 @@
png_save_int_32(buf + 4, X1);
buf[8] = (png_byte)type;
buf[9] = (png_byte)nparams;
- png_write_chunk_data(png_ptr, buf, (png_size_t)10);
- png_write_chunk_data(png_ptr, (png_const_bytep)units, (png_size_t)units_len);
+ png_write_chunk_data(png_ptr, buf, 10);
+ png_write_chunk_data(png_ptr, (png_const_bytep)units, (size_t)units_len);
for (i = 0; i < nparams; i++)
{
@@ -1783,7 +1810,7 @@
png_const_charp height)
{
png_byte buf[64];
- png_size_t wlen, hlen, total_len;
+ size_t wlen, hlen, total_len;
png_debug(1, "in png_write_sCAL_s");
@@ -1824,7 +1851,7 @@
png_save_uint_32(buf + 4, y_pixels_per_unit);
buf[8] = (png_byte)unit_type;
- png_write_complete_chunk(png_ptr, png_pHYs, buf, (png_size_t)9);
+ png_write_complete_chunk(png_ptr, png_pHYs, buf, 9);
}
#endif
@@ -1854,7 +1881,7 @@
buf[5] = mod_time->minute;
buf[6] = mod_time->second;
- png_write_complete_chunk(png_ptr, png_tIME, buf, (png_size_t)7);
+ png_write_complete_chunk(png_ptr, png_tIME, buf, 7);
}
#endif
@@ -1866,16 +1893,16 @@
/* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */
/* Start of interlace block */
- static PNG_CONST png_byte png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0};
+ static const png_byte png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0};
/* Offset to next interlace block */
- static PNG_CONST png_byte png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
+ static const png_byte png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
/* Start of interlace block in the y direction */
- static PNG_CONST png_byte png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1};
+ static const png_byte png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1};
/* Offset to next interlace block in the y direction */
- static PNG_CONST png_byte png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2};
+ static const png_byte png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2};
#endif
png_alloc_size_t buf_size;
@@ -1981,16 +2008,16 @@
/* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */
/* Start of interlace block */
- static PNG_CONST png_byte png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0};
+ static const png_byte png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0};
/* Offset to next interlace block */
- static PNG_CONST png_byte png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
+ static const png_byte png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
/* Start of interlace block in the y direction */
- static PNG_CONST png_byte png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1};
+ static const png_byte png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1};
/* Offset to next interlace block in the y direction */
- static PNG_CONST png_byte png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2};
+ static const png_byte png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2};
#endif
png_debug(1, "in png_write_finish_row");
@@ -2044,8 +2071,8 @@
{
if (png_ptr->prev_row != NULL)
memset(png_ptr->prev_row, 0,
- (png_size_t)(PNG_ROWBYTES(png_ptr->usr_channels*
- png_ptr->usr_bit_depth, png_ptr->width)) + 1);
+ PNG_ROWBYTES(png_ptr->usr_channels *
+ png_ptr->usr_bit_depth, png_ptr->width) + 1);
return;
}
@@ -2071,10 +2098,10 @@
/* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */
/* Start of interlace block */
- static PNG_CONST png_byte png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0};
+ static const png_byte png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0};
/* Offset to next interlace block */
- static PNG_CONST png_byte png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
+ static const png_byte png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
png_debug(1, "in png_do_write_interlace");
@@ -2101,7 +2128,7 @@
for (i = png_pass_start[pass]; i < row_width;
i += png_pass_inc[pass])
{
- sp = row + (png_size_t)(i >> 3);
+ sp = row + (size_t)(i >> 3);
value = (int)(*sp >> (7 - (int)(i & 0x07))) & 0x01;
d |= (value << shift);
@@ -2139,7 +2166,7 @@
for (i = png_pass_start[pass]; i < row_width;
i += png_pass_inc[pass])
{
- sp = row + (png_size_t)(i >> 2);
+ sp = row + (size_t)(i >> 2);
value = (*sp >> ((3 - (int)(i & 0x03)) << 1)) & 0x03;
d |= (value << shift);
@@ -2175,7 +2202,7 @@
for (i = png_pass_start[pass]; i < row_width;
i += png_pass_inc[pass])
{
- sp = row + (png_size_t)(i >> 1);
+ sp = row + (size_t)(i >> 1);
value = (*sp >> ((1 - (int)(i & 0x01)) << 2)) & 0x0f;
d |= (value << shift);
@@ -2201,7 +2228,7 @@
png_bytep dp;
png_uint_32 i;
png_uint_32 row_width = row_info->width;
- png_size_t pixel_bytes;
+ size_t pixel_bytes;
/* Start at the beginning */
dp = row;
@@ -2214,7 +2241,7 @@
i += png_pass_inc[pass])
{
/* Find out where the original pixel is */
- sp = row + (png_size_t)i * pixel_bytes;
+ sp = row + (size_t)i * pixel_bytes;
/* Move the pixel */
if (dp != sp)
@@ -2245,17 +2272,17 @@
*/
static void /* PRIVATE */
png_write_filtered_row(png_structrp png_ptr, png_bytep filtered_row,
- png_size_t row_bytes);
+ size_t row_bytes);
#ifdef PNG_WRITE_FILTER_SUPPORTED
-static png_size_t /* PRIVATE */
-png_setup_sub_row(png_structrp png_ptr, const png_uint_32 bpp,
- const png_size_t row_bytes, const png_size_t lmins)
+static size_t /* PRIVATE */
+png_setup_sub_row(png_structrp png_ptr, png_uint_32 bpp,
+ size_t row_bytes, size_t lmins)
{
png_bytep rp, dp, lp;
- png_size_t i;
- png_size_t sum = 0;
- int v;
+ size_t i;
+ size_t sum = 0;
+ unsigned int v;
png_ptr->try_row[0] = PNG_FILTER_VALUE_SUB;
@@ -2264,7 +2291,7 @@
{
v = *dp = *rp;
#ifdef PNG_USE_ABS
- sum += 128 - abs(v - 128);
+ sum += 128 - abs((int)v - 128);
#else
sum += (v < 128) ? v : 256 - v;
#endif
@@ -2275,7 +2302,7 @@
{
v = *dp = (png_byte)(((int)*rp - (int)*lp) & 0xff);
#ifdef PNG_USE_ABS
- sum += 128 - abs(v - 128);
+ sum += 128 - abs((int)v - 128);
#else
sum += (v < 128) ? v : 256 - v;
#endif
@@ -2288,11 +2315,11 @@
}
static void /* PRIVATE */
-png_setup_sub_row_only(png_structrp png_ptr, const png_uint_32 bpp,
- const png_size_t row_bytes)
+png_setup_sub_row_only(png_structrp png_ptr, png_uint_32 bpp,
+ size_t row_bytes)
{
png_bytep rp, dp, lp;
- png_size_t i;
+ size_t i;
png_ptr->try_row[0] = PNG_FILTER_VALUE_SUB;
@@ -2309,14 +2336,13 @@
}
}
-static png_size_t /* PRIVATE */
-png_setup_up_row(png_structrp png_ptr, const png_size_t row_bytes,
- const png_size_t lmins)
+static size_t /* PRIVATE */
+png_setup_up_row(png_structrp png_ptr, size_t row_bytes, size_t lmins)
{
png_bytep rp, dp, pp;
- png_size_t i;
- png_size_t sum = 0;
- int v;
+ size_t i;
+ size_t sum = 0;
+ unsigned int v;
png_ptr->try_row[0] = PNG_FILTER_VALUE_UP;
@@ -2326,7 +2352,7 @@
{
v = *dp = (png_byte)(((int)*rp - (int)*pp) & 0xff);
#ifdef PNG_USE_ABS
- sum += 128 - abs(v - 128);
+ sum += 128 - abs((int)v - 128);
#else
sum += (v < 128) ? v : 256 - v;
#endif
@@ -2338,10 +2364,10 @@
return (sum);
}
static void /* PRIVATE */
-png_setup_up_row_only(png_structrp png_ptr, const png_size_t row_bytes)
+png_setup_up_row_only(png_structrp png_ptr, size_t row_bytes)
{
png_bytep rp, dp, pp;
- png_size_t i;
+ size_t i;
png_ptr->try_row[0] = PNG_FILTER_VALUE_UP;
@@ -2353,14 +2379,14 @@
}
}
-static png_size_t /* PRIVATE */
-png_setup_avg_row(png_structrp png_ptr, const png_uint_32 bpp,
- const png_size_t row_bytes, const png_size_t lmins)
+static size_t /* PRIVATE */
+png_setup_avg_row(png_structrp png_ptr, png_uint_32 bpp,
+ size_t row_bytes, size_t lmins)
{
png_bytep rp, dp, pp, lp;
png_uint_32 i;
- png_size_t sum = 0;
- int v;
+ size_t sum = 0;
+ unsigned int v;
png_ptr->try_row[0] = PNG_FILTER_VALUE_AVG;
@@ -2370,7 +2396,7 @@
v = *dp++ = (png_byte)(((int)*rp++ - ((int)*pp++ / 2)) & 0xff);
#ifdef PNG_USE_ABS
- sum += 128 - abs(v - 128);
+ sum += 128 - abs((int)v - 128);
#else
sum += (v < 128) ? v : 256 - v;
#endif
@@ -2382,7 +2408,7 @@
& 0xff);
#ifdef PNG_USE_ABS
- sum += 128 - abs(v - 128);
+ sum += 128 - abs((int)v - 128);
#else
sum += (v < 128) ? v : 256 - v;
#endif
@@ -2394,8 +2420,8 @@
return (sum);
}
static void /* PRIVATE */
-png_setup_avg_row_only(png_structrp png_ptr, const png_uint_32 bpp,
- const png_size_t row_bytes)
+png_setup_avg_row_only(png_structrp png_ptr, png_uint_32 bpp,
+ size_t row_bytes)
{
png_bytep rp, dp, pp, lp;
png_uint_32 i;
@@ -2415,14 +2441,14 @@
}
}
-static png_size_t /* PRIVATE */
-png_setup_paeth_row(png_structrp png_ptr, const png_uint_32 bpp,
- const png_size_t row_bytes, const png_size_t lmins)
+static size_t /* PRIVATE */
+png_setup_paeth_row(png_structrp png_ptr, png_uint_32 bpp,
+ size_t row_bytes, size_t lmins)
{
png_bytep rp, dp, pp, cp, lp;
- png_size_t i;
- png_size_t sum = 0;
- int v;
+ size_t i;
+ size_t sum = 0;
+ unsigned int v;
png_ptr->try_row[0] = PNG_FILTER_VALUE_PAETH;
@@ -2432,7 +2458,7 @@
v = *dp++ = (png_byte)(((int)*rp++ - (int)*pp++) & 0xff);
#ifdef PNG_USE_ABS
- sum += 128 - abs(v - 128);
+ sum += 128 - abs((int)v - 128);
#else
sum += (v < 128) ? v : 256 - v;
#endif
@@ -2465,7 +2491,7 @@
v = *dp++ = (png_byte)(((int)*rp++ - p) & 0xff);
#ifdef PNG_USE_ABS
- sum += 128 - abs(v - 128);
+ sum += 128 - abs((int)v - 128);
#else
sum += (v < 128) ? v : 256 - v;
#endif
@@ -2477,11 +2503,11 @@
return (sum);
}
static void /* PRIVATE */
-png_setup_paeth_row_only(png_structrp png_ptr, const png_uint_32 bpp,
- const png_size_t row_bytes)
+png_setup_paeth_row_only(png_structrp png_ptr, png_uint_32 bpp,
+ size_t row_bytes)
{
png_bytep rp, dp, pp, cp, lp;
- png_size_t i;
+ size_t i;
png_ptr->try_row[0] = PNG_FILTER_VALUE_PAETH;
@@ -2530,8 +2556,8 @@
png_bytep row_buf;
png_bytep best_row;
png_uint_32 bpp;
- png_size_t mins;
- png_size_t row_bytes = row_info->rowbytes;
+ size_t mins;
+ size_t row_bytes = row_info->rowbytes;
png_debug(1, "in png_write_find_filter");
@@ -2586,16 +2612,16 @@
* 'none' filter.
*/
png_bytep rp;
- png_size_t sum = 0;
- png_size_t i;
- int v;
+ size_t sum = 0;
+ size_t i;
+ unsigned int v;
{
for (i = 0, rp = row_buf + 1; i < row_bytes; i++, rp++)
{
v = *rp;
#ifdef PNG_USE_ABS
- sum += 128 - abs(v - 128);
+ sum += 128 - abs((int)v - 128);
#else
sum += (v < 128) ? v : 256 - v;
#endif
@@ -2615,8 +2641,8 @@
else if ((filter_to_do & PNG_FILTER_SUB) != 0)
{
- png_size_t sum;
- png_size_t lmins = mins;
+ size_t sum;
+ size_t lmins = mins;
sum = png_setup_sub_row(png_ptr, bpp, row_bytes, lmins);
@@ -2641,8 +2667,8 @@
else if ((filter_to_do & PNG_FILTER_UP) != 0)
{
- png_size_t sum;
- png_size_t lmins = mins;
+ size_t sum;
+ size_t lmins = mins;
sum = png_setup_up_row(png_ptr, row_bytes, lmins);
@@ -2667,8 +2693,8 @@
else if ((filter_to_do & PNG_FILTER_AVG) != 0)
{
- png_size_t sum;
- png_size_t lmins = mins;
+ size_t sum;
+ size_t lmins = mins;
sum= png_setup_avg_row(png_ptr, bpp, row_bytes, lmins);
@@ -2693,8 +2719,8 @@
else if ((filter_to_do & PNG_FILTER_PAETH) != 0)
{
- png_size_t sum;
- png_size_t lmins = mins;
+ size_t sum;
+ size_t lmins = mins;
sum = png_setup_paeth_row(png_ptr, bpp, row_bytes, lmins);
@@ -2719,7 +2745,7 @@
/* Do the actual writing of a previously filtered row. */
static void
png_write_filtered_row(png_structrp png_ptr, png_bytep filtered_row,
- png_size_t full_row_length/*includes filter byte*/)
+ size_t full_row_length/*includes filter byte*/)
{
png_debug(1, "in png_write_filtered_row");
diff --git a/powerpc/filter_vsx_intrinsics.c b/powerpc/filter_vsx_intrinsics.c
new file mode 100644
index 0000000..01cf880
--- /dev/null
+++ b/powerpc/filter_vsx_intrinsics.c
@@ -0,0 +1,768 @@
+/* filter_vsx_intrinsics.c - PowerPC optimised filter functions
+ *
+ * Copyright (c) 2018 Cosmin Truta
+ * Copyright (c) 2017 Glenn Randers-Pehrson
+ * Written by Vadim Barkov, 2017.
+ *
+ * This code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
+ */
+
+#include <stdio.h>
+#include <stdint.h>
+#include "../pngpriv.h"
+
+#ifdef PNG_READ_SUPPORTED
+
+/* This code requires -maltivec and -mvsx on the command line: */
+#if PNG_POWERPC_VSX_IMPLEMENTATION == 1 /* intrinsics code from pngpriv.h */
+
+#include <altivec.h>
+
+#if PNG_POWERPC_VSX_OPT > 0
+
+#ifndef __VSX__
+# error "This code requires VSX support (POWER7 and later). Please provide -mvsx compiler flag."
+#endif
+
+#define vec_ld_unaligned(vec,data) vec = vec_vsx_ld(0,data)
+#define vec_st_unaligned(vec,data) vec_vsx_st(vec,0,data)
+
+
+/* Functions in this file look at most 3 pixels (a,b,c) to predict the 4th (d).
+ * They're positioned like this:
+ * prev: c b
+ * row: a d
+ * The Sub filter predicts d=a, Avg d=(a+b)/2, and Paeth predicts d to be
+ * whichever of a, b, or c is closest to p=a+b-c.
+ * ( this is taken from ../intel/filter_sse2_intrinsics.c )
+ */
+
+#define vsx_declare_common_vars(row_info,row,prev_row,offset) \
+ png_byte i;\
+ png_bytep rp = row + offset;\
+ png_const_bytep pp = prev_row;\
+ size_t unaligned_top = 16 - (((size_t)rp % 16));\
+ size_t istop;\
+ if(unaligned_top == 16)\
+ unaligned_top = 0;\
+ istop = row_info->rowbytes;\
+ if((unaligned_top < istop))\
+ istop -= unaligned_top;\
+ else{\
+ unaligned_top = istop;\
+ istop = 0;\
+ }
+
+void png_read_filter_row_up_vsx(png_row_infop row_info, png_bytep row,
+ png_const_bytep prev_row)
+{
+ vector unsigned char rp_vec;
+ vector unsigned char pp_vec;
+ vsx_declare_common_vars(row_info,row,prev_row,0)
+
+ /* Altivec operations require 16-byte aligned data
+ * but input can be unaligned. So we calculate
+ * unaligned part as usual.
+ */
+ for (i = 0; i < unaligned_top; i++)
+ {
+ *rp = (png_byte)(((int)(*rp) + (int)(*pp++)) & 0xff);
+ rp++;
+ }
+
+ /* Using SIMD while we can */
+ while( istop >= 16 )
+ {
+ rp_vec = vec_ld(0,rp);
+ vec_ld_unaligned(pp_vec,pp);
+
+ rp_vec = vec_add(rp_vec,pp_vec);
+
+ vec_st(rp_vec,0,rp);
+
+ pp += 16;
+ rp += 16;
+ istop -= 16;
+ }
+
+ if(istop > 0)
+ {
+ /* If byte count of row is not divisible by 16
+ * we will process remaining part as usual
+ */
+ for (i = 0; i < istop; i++)
+ {
+ *rp = (png_byte)(((int)(*rp) + (int)(*pp++)) & 0xff);
+ rp++;
+ }
+}
+
+}
+
+static const vector unsigned char VSX_LEFTSHIFTED1_4 = {16,16,16,16, 0, 1, 2, 3,16,16,16,16,16,16,16,16};
+static const vector unsigned char VSX_LEFTSHIFTED2_4 = {16,16,16,16,16,16,16,16, 4, 5, 6, 7,16,16,16,16};
+static const vector unsigned char VSX_LEFTSHIFTED3_4 = {16,16,16,16,16,16,16,16,16,16,16,16, 8, 9,10,11};
+
+static const vector unsigned char VSX_LEFTSHIFTED1_3 = {16,16,16, 0, 1, 2,16,16,16,16,16,16,16,16,16,16};
+static const vector unsigned char VSX_LEFTSHIFTED2_3 = {16,16,16,16,16,16, 3, 4, 5,16,16,16,16,16,16,16};
+static const vector unsigned char VSX_LEFTSHIFTED3_3 = {16,16,16,16,16,16,16,16,16, 6, 7, 8,16,16,16,16};
+static const vector unsigned char VSX_LEFTSHIFTED4_3 = {16,16,16,16,16,16,16,16,16,16,16,16, 9,10,11,16};
+
+static const vector unsigned char VSX_NOT_SHIFTED1_4 = {16,16,16,16, 4, 5, 6, 7,16,16,16,16,16,16,16,16};
+static const vector unsigned char VSX_NOT_SHIFTED2_4 = {16,16,16,16,16,16,16,16, 8, 9,10,11,16,16,16,16};
+static const vector unsigned char VSX_NOT_SHIFTED3_4 = {16,16,16,16,16,16,16,16,16,16,16,16,12,13,14,15};
+
+static const vector unsigned char VSX_NOT_SHIFTED1_3 = {16,16,16, 3, 4, 5,16,16,16,16,16,16,16,16,16,16};
+static const vector unsigned char VSX_NOT_SHIFTED2_3 = {16,16,16,16,16,16, 6, 7, 8,16,16,16,16,16,16,16};
+static const vector unsigned char VSX_NOT_SHIFTED3_3 = {16,16,16,16,16,16,16,16,16, 9,10,11,16,16,16,16};
+static const vector unsigned char VSX_NOT_SHIFTED4_3 = {16,16,16,16,16,16,16,16,16,16,16,16,12,13,14,16};
+
+static const vector unsigned char VSX_CHAR_ZERO = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
+#ifdef __LITTLE_ENDIAN__
+
+static const vector unsigned char VSX_CHAR_TO_SHORT1_4 = { 4,16, 5,16, 6,16, 7,16,16,16,16,16,16,16,16,16};
+static const vector unsigned char VSX_CHAR_TO_SHORT2_4 = { 8,16, 9,16,10,16,11,16,16,16,16,16,16,16,16,16};
+static const vector unsigned char VSX_CHAR_TO_SHORT3_4 = {12,16,13,16,14,16,15,16,16,16,16,16,16,16,16,16};
+
+static const vector unsigned char VSX_SHORT_TO_CHAR1_4 = {16,16,16,16, 0, 2, 4, 6,16,16,16,16,16,16,16,16};
+static const vector unsigned char VSX_SHORT_TO_CHAR2_4 = {16,16,16,16,16,16,16,16, 0, 2, 4, 6,16,16,16,16};
+static const vector unsigned char VSX_SHORT_TO_CHAR3_4 = {16,16,16,16,16,16,16,16,16,16,16,16, 0, 2, 4, 6};
+
+static const vector unsigned char VSX_CHAR_TO_SHORT1_3 = { 3,16, 4,16, 5,16,16,16,16,16,16,16,16,16,16,16};
+static const vector unsigned char VSX_CHAR_TO_SHORT2_3 = { 6,16, 7,16, 8,16,16,16,16,16,16,16,16,16,16,16};
+static const vector unsigned char VSX_CHAR_TO_SHORT3_3 = { 9,16,10,16,11,16,16,16,16,16,16,16,16,16,16,16};
+static const vector unsigned char VSX_CHAR_TO_SHORT4_3 = {12,16,13,16,14,16,16,16,16,16,16,16,16,16,16,16};
+
+static const vector unsigned char VSX_SHORT_TO_CHAR1_3 = {16,16,16, 0, 2, 4,16,16,16,16,16,16,16,16,16,16};
+static const vector unsigned char VSX_SHORT_TO_CHAR2_3 = {16,16,16,16,16,16, 0, 2, 4,16,16,16,16,16,16,16};
+static const vector unsigned char VSX_SHORT_TO_CHAR3_3 = {16,16,16,16,16,16,16,16,16, 0, 2, 4,16,16,16,16};
+static const vector unsigned char VSX_SHORT_TO_CHAR4_3 = {16,16,16,16,16,16,16,16,16,16,16,16, 0, 2, 4,16};
+
+#elif defined(__BIG_ENDIAN__)
+
+static const vector unsigned char VSX_CHAR_TO_SHORT1_4 = {16, 4,16, 5,16, 6,16, 7,16,16,16,16,16,16,16,16};
+static const vector unsigned char VSX_CHAR_TO_SHORT2_4 = {16, 8,16, 9,16,10,16,11,16,16,16,16,16,16,16,16};
+static const vector unsigned char VSX_CHAR_TO_SHORT3_4 = {16,12,16,13,16,14,16,15,16,16,16,16,16,16,16,16};
+
+static const vector unsigned char VSX_SHORT_TO_CHAR1_4 = {16,16,16,16, 1, 3, 5, 7,16,16,16,16,16,16,16,16};
+static const vector unsigned char VSX_SHORT_TO_CHAR2_4 = {16,16,16,16,16,16,16,16, 1, 3, 5, 7,16,16,16,16};
+static const vector unsigned char VSX_SHORT_TO_CHAR3_4 = {16,16,16,16,16,16,16,16,16,16,16,16, 1, 3, 5, 7};
+
+static const vector unsigned char VSX_CHAR_TO_SHORT1_3 = {16, 3,16, 4,16, 5,16,16,16,16,16,16,16,16,16,16};
+static const vector unsigned char VSX_CHAR_TO_SHORT2_3 = {16, 6,16, 7,16, 8,16,16,16,16,16,16,16,16,16,16};
+static const vector unsigned char VSX_CHAR_TO_SHORT3_3 = {16, 9,16,10,16,11,16,16,16,16,16,16,16,16,16,16};
+static const vector unsigned char VSX_CHAR_TO_SHORT4_3 = {16,12,16,13,16,14,16,16,16,16,16,16,16,16,16,16};
+
+static const vector unsigned char VSX_SHORT_TO_CHAR1_3 = {16,16,16, 1, 3, 5,16,16,16,16,16,16,16,16,16,16};
+static const vector unsigned char VSX_SHORT_TO_CHAR2_3 = {16,16,16,16,16,16, 1, 3, 5,16,16,16,16,16,16,16};
+static const vector unsigned char VSX_SHORT_TO_CHAR3_3 = {16,16,16,16,16,16,16,16,16, 1, 3, 5,16,16,16,16};
+static const vector unsigned char VSX_SHORT_TO_CHAR4_3 = {16,16,16,16,16,16,16,16,16,16,16,16, 1, 3, 5,16};
+
+#endif
+
+#define vsx_char_to_short(vec,offset,bpp) (vector unsigned short)vec_perm((vec),VSX_CHAR_ZERO,VSX_CHAR_TO_SHORT##offset##_##bpp)
+#define vsx_short_to_char(vec,offset,bpp) vec_perm(((vector unsigned char)(vec)),VSX_CHAR_ZERO,VSX_SHORT_TO_CHAR##offset##_##bpp)
+
+#ifdef PNG_USE_ABS
+# define vsx_abs(number) abs(number)
+#else
+# define vsx_abs(number) (number > 0) ? (number) : -(number)
+#endif
+
+void png_read_filter_row_sub4_vsx(png_row_infop row_info, png_bytep row,
+ png_const_bytep prev_row)
+{
+ png_byte bpp = 4;
+
+ vector unsigned char rp_vec;
+ vector unsigned char part_vec;
+
+ vsx_declare_common_vars(row_info,row,prev_row,bpp)
+
+ PNG_UNUSED(pp)
+
+ /* Altivec operations require 16-byte aligned data
+ * but input can be unaligned. So we calculate
+ * unaligned part as usual.
+ */
+ for (i = 0; i < unaligned_top; i++)
+ {
+ *rp = (png_byte)(((int)(*rp) + (int)(*(rp-bpp))) & 0xff);
+ rp++;
+ }
+
+ /* Using SIMD while we can */
+ while( istop >= 16 )
+ {
+ for(i=0;i < bpp ; i++)
+ {
+ *rp = (png_byte)(((int)(*rp) + (int)(*(rp-bpp))) & 0xff);
+ rp++;
+ }
+ rp -= bpp;
+
+ rp_vec = vec_ld(0,rp);
+ part_vec = vec_perm(rp_vec,VSX_CHAR_ZERO,VSX_LEFTSHIFTED1_4);
+ rp_vec = vec_add(rp_vec,part_vec);
+
+ part_vec = vec_perm(rp_vec,VSX_CHAR_ZERO,VSX_LEFTSHIFTED2_4);
+ rp_vec = vec_add(rp_vec,part_vec);
+
+ part_vec = vec_perm(rp_vec,VSX_CHAR_ZERO,VSX_LEFTSHIFTED3_4);
+ rp_vec = vec_add(rp_vec,part_vec);
+
+ vec_st(rp_vec,0,rp);
+
+ rp += 16;
+ istop -= 16;
+ }
+
+ if(istop > 0)
+ for (i = 0; i < istop % 16; i++)
+ {
+ *rp = (png_byte)(((int)(*rp) + (int)(*(rp - bpp))) & 0xff);
+ rp++;
+ }
+
+}
+
+void png_read_filter_row_sub3_vsx(png_row_infop row_info, png_bytep row,
+ png_const_bytep prev_row)
+{
+ png_byte bpp = 3;
+
+ vector unsigned char rp_vec;
+ vector unsigned char part_vec;
+
+ vsx_declare_common_vars(row_info,row,prev_row,bpp)
+
+ PNG_UNUSED(pp)
+
+ /* Altivec operations require 16-byte aligned data
+ * but input can be unaligned. So we calculate
+ * unaligned part as usual.
+ */
+ for (i = 0; i < unaligned_top; i++)
+ {
+ *rp = (png_byte)(((int)(*rp) + (int)(*(rp-bpp))) & 0xff);
+ rp++;
+ }
+
+ /* Using SIMD while we can */
+ while( istop >= 16 )
+ {
+ for(i=0;i < bpp ; i++)
+ {
+ *rp = (png_byte)(((int)(*rp) + (int)(*(rp-bpp))) & 0xff);
+ rp++;
+ }
+ rp -= bpp;
+
+ rp_vec = vec_ld(0,rp);
+ part_vec = vec_perm(rp_vec,VSX_CHAR_ZERO,VSX_LEFTSHIFTED1_3);
+ rp_vec = vec_add(rp_vec,part_vec);
+
+ part_vec = vec_perm(rp_vec,VSX_CHAR_ZERO,VSX_LEFTSHIFTED2_3);
+ rp_vec = vec_add(rp_vec,part_vec);
+
+ part_vec = vec_perm(rp_vec,VSX_CHAR_ZERO,VSX_LEFTSHIFTED3_3);
+ rp_vec = vec_add(rp_vec,part_vec);
+
+ part_vec = vec_perm(rp_vec,VSX_CHAR_ZERO,VSX_LEFTSHIFTED4_3);
+ rp_vec = vec_add(rp_vec,part_vec);
+
+ vec_st(rp_vec,0,rp);
+ rp += 15;
+ istop -= 16;
+
+ /* Since 16 % bpp = 16 % 3 = 1, last element of array must
+ * be proceeded manually
+ */
+ *rp = (png_byte)(((int)(*rp) + (int)(*(rp-bpp))) & 0xff);
+ rp++;
+ }
+
+ if(istop > 0)
+ for (i = 0; i < istop % 16; i++)
+ {
+ *rp = (png_byte)(((int)(*rp) + (int)(*(rp-bpp))) & 0xff);
+ rp++;
+ }
+}
+
+void png_read_filter_row_avg4_vsx(png_row_infop row_info, png_bytep row,
+ png_const_bytep prev_row)
+{
+ png_byte bpp = 4;
+
+ vector unsigned char rp_vec;
+ vector unsigned char pp_vec;
+ vector unsigned char pp_part_vec;
+ vector unsigned char rp_part_vec;
+ vector unsigned char avg_vec;
+
+ vsx_declare_common_vars(row_info,row,prev_row,bpp)
+ rp -= bpp;
+ if(istop >= bpp)
+ istop -= bpp;
+
+ for (i = 0; i < bpp; i++)
+ {
+ *rp = (png_byte)(((int)(*rp) +
+ ((int)(*pp++) / 2 )) & 0xff);
+
+ rp++;
+ }
+
+ /* Altivec operations require 16-byte aligned data
+ * but input can be unaligned. So we calculate
+ * unaligned part as usual.
+ */
+ for (i = 0; i < unaligned_top; i++)
+ {
+ *rp = (png_byte)(((int)(*rp) +
+ (int)(*pp++ + *(rp-bpp)) / 2 ) & 0xff);
+
+ rp++;
+ }
+
+ /* Using SIMD while we can */
+ while( istop >= 16 )
+ {
+ for(i=0;i < bpp ; i++)
+ {
+ *rp = (png_byte)(((int)(*rp) +
+ (int)(*pp++ + *(rp-bpp)) / 2 ) & 0xff);
+
+ rp++;
+ }
+ rp -= bpp;
+ pp -= bpp;
+
+ vec_ld_unaligned(pp_vec,pp);
+ rp_vec = vec_ld(0,rp);
+
+ rp_part_vec = vec_perm(rp_vec,VSX_CHAR_ZERO,VSX_LEFTSHIFTED1_4);
+ pp_part_vec = vec_perm(pp_vec,VSX_CHAR_ZERO,VSX_NOT_SHIFTED1_4);
+ avg_vec = vec_avg(rp_part_vec,pp_part_vec);
+ avg_vec = vec_sub(avg_vec, vec_and(vec_xor(rp_part_vec,pp_part_vec),vec_splat_u8(1)));
+ rp_vec = vec_add(rp_vec,avg_vec);
+
+ rp_part_vec = vec_perm(rp_vec,VSX_CHAR_ZERO,VSX_LEFTSHIFTED2_4);
+ pp_part_vec = vec_perm(pp_vec,VSX_CHAR_ZERO,VSX_NOT_SHIFTED2_4);
+ avg_vec = vec_avg(rp_part_vec,pp_part_vec);
+ avg_vec = vec_sub(avg_vec, vec_and(vec_xor(rp_part_vec,pp_part_vec),vec_splat_u8(1)));
+ rp_vec = vec_add(rp_vec,avg_vec);
+
+ rp_part_vec = vec_perm(rp_vec,VSX_CHAR_ZERO,VSX_LEFTSHIFTED3_4);
+ pp_part_vec = vec_perm(pp_vec,VSX_CHAR_ZERO,VSX_NOT_SHIFTED3_4);
+ avg_vec = vec_avg(rp_part_vec,pp_part_vec);
+ avg_vec = vec_sub(avg_vec, vec_and(vec_xor(rp_part_vec,pp_part_vec),vec_splat_u8(1)));
+ rp_vec = vec_add(rp_vec,avg_vec);
+
+ vec_st(rp_vec,0,rp);
+
+ rp += 16;
+ pp += 16;
+ istop -= 16;
+ }
+
+ if(istop > 0)
+ for (i = 0; i < istop % 16; i++)
+ {
+ *rp = (png_byte)(((int)(*rp) +
+ (int)(*pp++ + *(rp-bpp)) / 2 ) & 0xff);
+
+ rp++;
+ }
+}
+
+void png_read_filter_row_avg3_vsx(png_row_infop row_info, png_bytep row,
+ png_const_bytep prev_row)
+{
+ png_byte bpp = 3;
+
+ vector unsigned char rp_vec;
+ vector unsigned char pp_vec;
+ vector unsigned char pp_part_vec;
+ vector unsigned char rp_part_vec;
+ vector unsigned char avg_vec;
+
+ vsx_declare_common_vars(row_info,row,prev_row,bpp)
+ rp -= bpp;
+ if(istop >= bpp)
+ istop -= bpp;
+
+ for (i = 0; i < bpp; i++)
+ {
+ *rp = (png_byte)(((int)(*rp) +
+ ((int)(*pp++) / 2 )) & 0xff);
+
+ rp++;
+ }
+
+ /* Altivec operations require 16-byte aligned data
+ * but input can be unaligned. So we calculate
+ * unaligned part as usual.
+ */
+ for (i = 0; i < unaligned_top; i++)
+ {
+ *rp = (png_byte)(((int)(*rp) +
+ (int)(*pp++ + *(rp-bpp)) / 2 ) & 0xff);
+
+ rp++;
+ }
+
+ /* Using SIMD while we can */
+ while( istop >= 16 )
+ {
+ for(i=0;i < bpp ; i++)
+ {
+ *rp = (png_byte)(((int)(*rp) +
+ (int)(*pp++ + *(rp-bpp)) / 2 ) & 0xff);
+
+ rp++;
+ }
+ rp -= bpp;
+ pp -= bpp;
+
+ vec_ld_unaligned(pp_vec,pp);
+ rp_vec = vec_ld(0,rp);
+
+ rp_part_vec = vec_perm(rp_vec,VSX_CHAR_ZERO,VSX_LEFTSHIFTED1_3);
+ pp_part_vec = vec_perm(pp_vec,VSX_CHAR_ZERO,VSX_NOT_SHIFTED1_3);
+ avg_vec = vec_avg(rp_part_vec,pp_part_vec);
+ avg_vec = vec_sub(avg_vec, vec_and(vec_xor(rp_part_vec,pp_part_vec),vec_splat_u8(1)));
+ rp_vec = vec_add(rp_vec,avg_vec);
+
+ rp_part_vec = vec_perm(rp_vec,VSX_CHAR_ZERO,VSX_LEFTSHIFTED2_3);
+ pp_part_vec = vec_perm(pp_vec,VSX_CHAR_ZERO,VSX_NOT_SHIFTED2_3);
+ avg_vec = vec_avg(rp_part_vec,pp_part_vec);
+ avg_vec = vec_sub(avg_vec, vec_and(vec_xor(rp_part_vec,pp_part_vec),vec_splat_u8(1)));
+ rp_vec = vec_add(rp_vec,avg_vec);
+
+ rp_part_vec = vec_perm(rp_vec,VSX_CHAR_ZERO,VSX_LEFTSHIFTED3_3);
+ pp_part_vec = vec_perm(pp_vec,VSX_CHAR_ZERO,VSX_NOT_SHIFTED3_3);
+ avg_vec = vec_avg(rp_part_vec,pp_part_vec);
+ avg_vec = vec_sub(avg_vec, vec_and(vec_xor(rp_part_vec,pp_part_vec),vec_splat_u8(1)));
+ rp_vec = vec_add(rp_vec,avg_vec);
+
+ rp_part_vec = vec_perm(rp_vec,VSX_CHAR_ZERO,VSX_LEFTSHIFTED4_3);
+ pp_part_vec = vec_perm(pp_vec,VSX_CHAR_ZERO,VSX_NOT_SHIFTED4_3);
+ avg_vec = vec_avg(rp_part_vec,pp_part_vec);
+ avg_vec = vec_sub(avg_vec, vec_and(vec_xor(rp_part_vec,pp_part_vec),vec_splat_u8(1)));
+ rp_vec = vec_add(rp_vec,avg_vec);
+
+ vec_st(rp_vec,0,rp);
+
+ rp += 15;
+ pp += 15;
+ istop -= 16;
+
+ /* Since 16 % bpp = 16 % 3 = 1, last element of array must
+ * be proceeded manually
+ */
+ *rp = (png_byte)(((int)(*rp) +
+ (int)(*pp++ + *(rp-bpp)) / 2 ) & 0xff);
+ rp++;
+ }
+
+ if(istop > 0)
+ for (i = 0; i < istop % 16; i++)
+ {
+ *rp = (png_byte)(((int)(*rp) +
+ (int)(*pp++ + *(rp-bpp)) / 2 ) & 0xff);
+
+ rp++;
+ }
+}
+
+/* Bytewise c ? t : e. */
+#define if_then_else(c,t,e) vec_sel(e,t,c)
+
+#define vsx_paeth_process(rp,pp,a,b,c,pa,pb,pc,bpp) {\
+ c = *(pp - bpp);\
+ a = *(rp - bpp);\
+ b = *pp++;\
+ p = b - c;\
+ pc = a - c;\
+ pa = vsx_abs(p);\
+ pb = vsx_abs(pc);\
+ pc = vsx_abs(p + pc);\
+ if (pb < pa) pa = pb, a = b;\
+ if (pc < pa) a = c;\
+ a += *rp;\
+ *rp++ = (png_byte)a;\
+ }
+
+void png_read_filter_row_paeth4_vsx(png_row_infop row_info, png_bytep row,
+ png_const_bytep prev_row)
+{
+ png_byte bpp = 4;
+
+ int a, b, c, pa, pb, pc, p;
+ vector unsigned char rp_vec;
+ vector unsigned char pp_vec;
+ vector unsigned short a_vec,b_vec,c_vec,nearest_vec;
+ vector signed short pa_vec,pb_vec,pc_vec,smallest_vec;
+
+ vsx_declare_common_vars(row_info,row,prev_row,bpp)
+ rp -= bpp;
+ if(istop >= bpp)
+ istop -= bpp;
+
+ /* Process the first pixel in the row completely (this is the same as 'up'
+ * because there is only one candidate predictor for the first row).
+ */
+ for(i = 0; i < bpp ; i++)
+ {
+ *rp = (png_byte)( *rp + *pp);
+ rp++;
+ pp++;
+ }
+
+ for(i = 0; i < unaligned_top ; i++)
+ {
+ vsx_paeth_process(rp,pp,a,b,c,pa,pb,pc,bpp)
+ }
+
+ while( istop >= 16)
+ {
+ for(i = 0; i < bpp ; i++)
+ {
+ vsx_paeth_process(rp,pp,a,b,c,pa,pb,pc,bpp)
+ }
+
+ rp -= bpp;
+ pp -= bpp;
+ rp_vec = vec_ld(0,rp);
+ vec_ld_unaligned(pp_vec,pp);
+
+ a_vec = vsx_char_to_short(vec_perm(rp_vec , VSX_CHAR_ZERO , VSX_LEFTSHIFTED1_4),1,4);
+ b_vec = vsx_char_to_short(vec_perm(pp_vec , VSX_CHAR_ZERO , VSX_NOT_SHIFTED1_4),1,4);
+ c_vec = vsx_char_to_short(vec_perm(pp_vec , VSX_CHAR_ZERO , VSX_LEFTSHIFTED1_4),1,4);
+ pa_vec = (vector signed short) vec_sub(b_vec,c_vec);
+ pb_vec = (vector signed short) vec_sub(a_vec , c_vec);
+ pc_vec = vec_add(pa_vec,pb_vec);
+ pa_vec = vec_abs(pa_vec);
+ pb_vec = vec_abs(pb_vec);
+ pc_vec = vec_abs(pc_vec);
+ smallest_vec = vec_min(pc_vec, vec_min(pa_vec,pb_vec));
+ nearest_vec = if_then_else(
+ vec_cmpeq(pa_vec,smallest_vec),
+ a_vec,
+ if_then_else(
+ vec_cmpeq(pb_vec,smallest_vec),
+ b_vec,
+ c_vec
+ )
+ );
+ rp_vec = vec_add(rp_vec,(vsx_short_to_char(nearest_vec,1,4)));
+
+ a_vec = vsx_char_to_short(vec_perm(rp_vec , VSX_CHAR_ZERO , VSX_LEFTSHIFTED2_4),2,4);
+ b_vec = vsx_char_to_short(vec_perm(pp_vec , VSX_CHAR_ZERO , VSX_NOT_SHIFTED2_4),2,4);
+ c_vec = vsx_char_to_short(vec_perm(pp_vec , VSX_CHAR_ZERO , VSX_LEFTSHIFTED2_4),2,4);
+ pa_vec = (vector signed short) vec_sub(b_vec,c_vec);
+ pb_vec = (vector signed short) vec_sub(a_vec , c_vec);
+ pc_vec = vec_add(pa_vec,pb_vec);
+ pa_vec = vec_abs(pa_vec);
+ pb_vec = vec_abs(pb_vec);
+ pc_vec = vec_abs(pc_vec);
+ smallest_vec = vec_min(pc_vec, vec_min(pa_vec,pb_vec));
+ nearest_vec = if_then_else(
+ vec_cmpeq(pa_vec,smallest_vec),
+ a_vec,
+ if_then_else(
+ vec_cmpeq(pb_vec,smallest_vec),
+ b_vec,
+ c_vec
+ )
+ );
+ rp_vec = vec_add(rp_vec,(vsx_short_to_char(nearest_vec,2,4)));
+
+ a_vec = vsx_char_to_short(vec_perm(rp_vec , VSX_CHAR_ZERO , VSX_LEFTSHIFTED3_4),3,4);
+ b_vec = vsx_char_to_short(vec_perm(pp_vec , VSX_CHAR_ZERO , VSX_NOT_SHIFTED3_4),3,4);
+ c_vec = vsx_char_to_short(vec_perm(pp_vec , VSX_CHAR_ZERO , VSX_LEFTSHIFTED3_4),3,4);
+ pa_vec = (vector signed short) vec_sub(b_vec,c_vec);
+ pb_vec = (vector signed short) vec_sub(a_vec , c_vec);
+ pc_vec = vec_add(pa_vec,pb_vec);
+ pa_vec = vec_abs(pa_vec);
+ pb_vec = vec_abs(pb_vec);
+ pc_vec = vec_abs(pc_vec);
+ smallest_vec = vec_min(pc_vec, vec_min(pa_vec,pb_vec));
+ nearest_vec = if_then_else(
+ vec_cmpeq(pa_vec,smallest_vec),
+ a_vec,
+ if_then_else(
+ vec_cmpeq(pb_vec,smallest_vec),
+ b_vec,
+ c_vec
+ )
+ );
+ rp_vec = vec_add(rp_vec,(vsx_short_to_char(nearest_vec,3,4)));
+
+ vec_st(rp_vec,0,rp);
+
+ rp += 16;
+ pp += 16;
+ istop -= 16;
+ }
+
+ if(istop > 0)
+ for (i = 0; i < istop % 16; i++)
+ {
+ vsx_paeth_process(rp,pp,a,b,c,pa,pb,pc,bpp)
+ }
+}
+
+void png_read_filter_row_paeth3_vsx(png_row_infop row_info, png_bytep row,
+ png_const_bytep prev_row)
+{
+ png_byte bpp = 3;
+
+ int a, b, c, pa, pb, pc, p;
+ vector unsigned char rp_vec;
+ vector unsigned char pp_vec;
+ vector unsigned short a_vec,b_vec,c_vec,nearest_vec;
+ vector signed short pa_vec,pb_vec,pc_vec,smallest_vec;
+
+ vsx_declare_common_vars(row_info,row,prev_row,bpp)
+ rp -= bpp;
+ if(istop >= bpp)
+ istop -= bpp;
+
+ /* Process the first pixel in the row completely (this is the same as 'up'
+ * because there is only one candidate predictor for the first row).
+ */
+ for(i = 0; i < bpp ; i++)
+ {
+ *rp = (png_byte)( *rp + *pp);
+ rp++;
+ pp++;
+ }
+
+ for(i = 0; i < unaligned_top ; i++)
+ {
+ vsx_paeth_process(rp,pp,a,b,c,pa,pb,pc,bpp)
+ }
+
+ while( istop >= 16)
+ {
+ for(i = 0; i < bpp ; i++)
+ {
+ vsx_paeth_process(rp,pp,a,b,c,pa,pb,pc,bpp)
+ }
+
+ rp -= bpp;
+ pp -= bpp;
+ rp_vec = vec_ld(0,rp);
+ vec_ld_unaligned(pp_vec,pp);
+
+ a_vec = vsx_char_to_short(vec_perm(rp_vec , VSX_CHAR_ZERO , VSX_LEFTSHIFTED1_3),1,3);
+ b_vec = vsx_char_to_short(vec_perm(pp_vec , VSX_CHAR_ZERO , VSX_NOT_SHIFTED1_3),1,3);
+ c_vec = vsx_char_to_short(vec_perm(pp_vec , VSX_CHAR_ZERO , VSX_LEFTSHIFTED1_3),1,3);
+ pa_vec = (vector signed short) vec_sub(b_vec,c_vec);
+ pb_vec = (vector signed short) vec_sub(a_vec , c_vec);
+ pc_vec = vec_add(pa_vec,pb_vec);
+ pa_vec = vec_abs(pa_vec);
+ pb_vec = vec_abs(pb_vec);
+ pc_vec = vec_abs(pc_vec);
+ smallest_vec = vec_min(pc_vec, vec_min(pa_vec,pb_vec));
+ nearest_vec = if_then_else(
+ vec_cmpeq(pa_vec,smallest_vec),
+ a_vec,
+ if_then_else(
+ vec_cmpeq(pb_vec,smallest_vec),
+ b_vec,
+ c_vec
+ )
+ );
+ rp_vec = vec_add(rp_vec,(vsx_short_to_char(nearest_vec,1,3)));
+
+ a_vec = vsx_char_to_short(vec_perm(rp_vec , VSX_CHAR_ZERO , VSX_LEFTSHIFTED2_3),2,3);
+ b_vec = vsx_char_to_short(vec_perm(pp_vec , VSX_CHAR_ZERO , VSX_NOT_SHIFTED2_3),2,3);
+ c_vec = vsx_char_to_short(vec_perm(pp_vec , VSX_CHAR_ZERO , VSX_LEFTSHIFTED2_3),2,3);
+ pa_vec = (vector signed short) vec_sub(b_vec,c_vec);
+ pb_vec = (vector signed short) vec_sub(a_vec , c_vec);
+ pc_vec = vec_add(pa_vec,pb_vec);
+ pa_vec = vec_abs(pa_vec);
+ pb_vec = vec_abs(pb_vec);
+ pc_vec = vec_abs(pc_vec);
+ smallest_vec = vec_min(pc_vec, vec_min(pa_vec,pb_vec));
+ nearest_vec = if_then_else(
+ vec_cmpeq(pa_vec,smallest_vec),
+ a_vec,
+ if_then_else(
+ vec_cmpeq(pb_vec,smallest_vec),
+ b_vec,
+ c_vec
+ )
+ );
+ rp_vec = vec_add(rp_vec,(vsx_short_to_char(nearest_vec,2,3)));
+
+ a_vec = vsx_char_to_short(vec_perm(rp_vec , VSX_CHAR_ZERO , VSX_LEFTSHIFTED3_3),3,3);
+ b_vec = vsx_char_to_short(vec_perm(pp_vec , VSX_CHAR_ZERO , VSX_NOT_SHIFTED3_3),3,3);
+ c_vec = vsx_char_to_short(vec_perm(pp_vec , VSX_CHAR_ZERO , VSX_LEFTSHIFTED3_3),3,3);
+ pa_vec = (vector signed short) vec_sub(b_vec,c_vec);
+ pb_vec = (vector signed short) vec_sub(a_vec , c_vec);
+ pc_vec = vec_add(pa_vec,pb_vec);
+ pa_vec = vec_abs(pa_vec);
+ pb_vec = vec_abs(pb_vec);
+ pc_vec = vec_abs(pc_vec);
+ smallest_vec = vec_min(pc_vec, vec_min(pa_vec,pb_vec));
+ nearest_vec = if_then_else(
+ vec_cmpeq(pa_vec,smallest_vec),
+ a_vec,
+ if_then_else(
+ vec_cmpeq(pb_vec,smallest_vec),
+ b_vec,
+ c_vec
+ )
+ );
+ rp_vec = vec_add(rp_vec,(vsx_short_to_char(nearest_vec,3,3)));
+
+ a_vec = vsx_char_to_short(vec_perm(rp_vec , VSX_CHAR_ZERO , VSX_LEFTSHIFTED4_3),4,3);
+ b_vec = vsx_char_to_short(vec_perm(pp_vec , VSX_CHAR_ZERO , VSX_NOT_SHIFTED4_3),4,3);
+ c_vec = vsx_char_to_short(vec_perm(pp_vec , VSX_CHAR_ZERO , VSX_LEFTSHIFTED4_3),4,3);
+ pa_vec = (vector signed short) vec_sub(b_vec,c_vec);
+ pb_vec = (vector signed short) vec_sub(a_vec , c_vec);
+ pc_vec = vec_add(pa_vec,pb_vec);
+ pa_vec = vec_abs(pa_vec);
+ pb_vec = vec_abs(pb_vec);
+ pc_vec = vec_abs(pc_vec);
+ smallest_vec = vec_min(pc_vec, vec_min(pa_vec,pb_vec));
+ nearest_vec = if_then_else(
+ vec_cmpeq(pa_vec,smallest_vec),
+ a_vec,
+ if_then_else(
+ vec_cmpeq(pb_vec,smallest_vec),
+ b_vec,
+ c_vec
+ )
+ );
+ rp_vec = vec_add(rp_vec,(vsx_short_to_char(nearest_vec,4,3)));
+
+ vec_st(rp_vec,0,rp);
+
+ rp += 15;
+ pp += 15;
+ istop -= 16;
+
+ /* Since 16 % bpp = 16 % 3 = 1, last element of array must
+ * be proceeded manually
+ */
+ vsx_paeth_process(rp,pp,a,b,c,pa,pb,pc,bpp)
+ }
+
+ if(istop > 0)
+ for (i = 0; i < istop % 16; i++)
+ {
+ vsx_paeth_process(rp,pp,a,b,c,pa,pb,pc,bpp)
+ }
+}
+
+#endif /* PNG_POWERPC_VSX_OPT > 0 */
+#endif /* PNG_POWERPC_VSX_IMPLEMENTATION == 1 (intrinsics) */
+#endif /* READ */
diff --git a/powerpc/powerpc_init.c b/powerpc/powerpc_init.c
new file mode 100644
index 0000000..54426c5
--- /dev/null
+++ b/powerpc/powerpc_init.c
@@ -0,0 +1,126 @@
+
+/* powerpc_init.c - POWERPC optimised filter functions
+ *
+ * Copyright (c) 2018 Cosmin Truta
+ * Copyright (c) 2017 Glenn Randers-Pehrson
+ * Written by Vadim Barkov, 2017.
+ *
+ * This code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
+ */
+
+/* Below, after checking __linux__, various non-C90 POSIX 1003.1 functions are
+ * called.
+ */
+#define _POSIX_SOURCE 1
+
+#include <stdio.h>
+#include "../pngpriv.h"
+
+#ifdef PNG_READ_SUPPORTED
+
+#if PNG_POWERPC_VSX_OPT > 0
+#ifdef PNG_POWERPC_VSX_CHECK_SUPPORTED /* Do run-time checks */
+/* WARNING: it is strongly recommended that you do not build libpng with
+ * run-time checks for CPU features if at all possible. In the case of the PowerPC
+ * VSX instructions there is no processor-specific way of detecting the
+ * presence of the required support, therefore run-time detection is extremely
+ * OS specific.
+ *
+ * You may set the macro PNG_POWERPC_VSX_FILE to the file name of file containing
+ * a fragment of C source code which defines the png_have_vsx function. There
+ * are a number of implementations in contrib/powerpc-vsx, but the only one that
+ * has partial support is contrib/powerpc-vsx/linux.c - a generic Linux
+ * implementation which reads /proc/cpufino.
+ */
+#ifndef PNG_POWERPC_VSX_FILE
+# ifdef __linux__
+# define PNG_POWERPC_VSX_FILE "contrib/powerpc-vsx/linux_aux.c"
+# endif
+#endif
+
+#ifdef PNG_POWERPC_VSX_FILE
+
+#include <signal.h> /* for sig_atomic_t */
+static int png_have_vsx(png_structp png_ptr);
+#include PNG_POWERPC_VSX_FILE
+
+#else /* PNG_POWERPC_VSX_FILE */
+# error "PNG_POWERPC_VSX_FILE undefined: no support for run-time POWERPC VSX checks"
+#endif /* PNG_POWERPC_VSX_FILE */
+#endif /* PNG_POWERPC_VSX_CHECK_SUPPORTED */
+
+void
+png_init_filter_functions_vsx(png_structp pp, unsigned int bpp)
+{
+ /* The switch statement is compiled in for POWERPC_VSX_API, the call to
+ * png_have_vsx is compiled in for POWERPC_VSX_CHECK. If both are defined
+ * the check is only performed if the API has not set the PowerPC option on
+ * or off explicitly. In this case the check controls what happens.
+ */
+
+#ifdef PNG_POWERPC_VSX_API_SUPPORTED
+ switch ((pp->options >> PNG_POWERPC_VSX) & 3)
+ {
+ case PNG_OPTION_UNSET:
+ /* Allow the run-time check to execute if it has been enabled -
+ * thus both API and CHECK can be turned on. If it isn't supported
+ * this case will fall through to the 'default' below, which just
+ * returns.
+ */
+#endif /* PNG_POWERPC_VSX_API_SUPPORTED */
+#ifdef PNG_POWERPC_VSX_CHECK_SUPPORTED
+ {
+ static volatile sig_atomic_t no_vsx = -1; /* not checked */
+
+ if (no_vsx < 0)
+ no_vsx = !png_have_vsx(pp);
+
+ if (no_vsx)
+ return;
+ }
+#ifdef PNG_POWERPC_VSX_API_SUPPORTED
+ break;
+#endif
+#endif /* PNG_POWERPC_VSX_CHECK_SUPPORTED */
+
+#ifdef PNG_POWERPC_VSX_API_SUPPORTED
+ default: /* OFF or INVALID */
+ return;
+
+ case PNG_OPTION_ON:
+ /* Option turned on */
+ break;
+ }
+#endif
+
+ /* IMPORTANT: any new internal functions used here must be declared using
+ * PNG_INTERNAL_FUNCTION in ../pngpriv.h. This is required so that the
+ * 'prefix' option to configure works:
+ *
+ * ./configure --with-libpng-prefix=foobar_
+ *
+ * Verify you have got this right by running the above command, doing a build
+ * and examining pngprefix.h; it must contain a #define for every external
+ * function you add. (Notice that this happens automatically for the
+ * initialization function.)
+ */
+ pp->read_filter[PNG_FILTER_VALUE_UP-1] = png_read_filter_row_up_vsx;
+
+ if (bpp == 3)
+ {
+ pp->read_filter[PNG_FILTER_VALUE_SUB-1] = png_read_filter_row_sub3_vsx;
+ pp->read_filter[PNG_FILTER_VALUE_AVG-1] = png_read_filter_row_avg3_vsx;
+ pp->read_filter[PNG_FILTER_VALUE_PAETH-1] = png_read_filter_row_paeth3_vsx;
+ }
+
+ else if (bpp == 4)
+ {
+ pp->read_filter[PNG_FILTER_VALUE_SUB-1] = png_read_filter_row_sub4_vsx;
+ pp->read_filter[PNG_FILTER_VALUE_AVG-1] = png_read_filter_row_avg4_vsx;
+ pp->read_filter[PNG_FILTER_VALUE_PAETH-1] = png_read_filter_row_paeth4_vsx;
+ }
+}
+#endif /* PNG_POWERPC_VSX_OPT > 0 */
+#endif /* READ */
