| |
| Libpng 1.7.0beta19 - September 30, 2013 |
| |
| This is not intended to be a public release. It will be replaced |
| within a few weeks by a public version or by another test version. |
| |
| Files available for download: |
| |
| Source files with LF line endings (for Unix/Linux) and with a |
| "configure" script |
| |
| 1.7.0beta19.tar.xz (LZMA-compressed, recommended) |
| 1.7.0beta19.tar.gz |
| |
| Source files with CRLF line endings (for Windows), without the |
| "configure" script |
| |
| lp170b19.7z (LZMA-compressed, recommended) |
| lp170b19.zip |
| |
| Other information: |
| |
| 1.7.0beta19-README.txt |
| 1.7.0beta19-LICENSE.txt |
| Gnupg/*.asc (PGP armored detached signatures) |
| |
| Changes since the last public release (1.6.0): |
| |
| Version 1.7.0alpha01 [December 15, 2012] |
| Started 1.7.0 branch from libpng-1.6.0beta33. |
| Made 8-bit compose and rgb_to_grayscale accuracy improvements. These |
| changes cause 16-bit arithmetic to be used for 8-bit data in the gamma |
| corrected compose and grayscale operations. The arithmetic errors have |
| three sources all of which are fixed in this commit: |
| 1) 8-bit linear calculations produce massive errors for lower intensity |
| values. |
| 2) The old 16-bit "16 to 8" gamma table code erroneously wrote the lowest |
| output value into a table entry which corresponded to multiple output |
| values (so where the value written should have been the closest to the |
| transformed input value.) |
| 3) In a number of cases the code to access the 16-bit table did not round; |
| it did a simple shift, which was wrong and made the side effects of (2) |
| even worse. |
| The new gamma code does not have the 16-to-8 problem at the cost of slightly |
| more calculations and the algorithm used to minimize the number of |
| calculations has been extended to all the 16-bit tables; it has advantages |
| for any significant gamma correction. |
| Rearranged png_struct, remove unused members, change png_set_filter handling |
| png_struct members rearranged - partly to reorder to avoid packing, partly |
| to put frequently accessed members at the start and partly to make |
| the grouping more clear. png_set_filter code has been rewritten and the |
| code shared with png_write_start_row moved to a common function. Comments |
| in png.h have been made more clear. Minor fixes to |
| contrib/libtests/timepng.c and some of the png_*_tRNS logic, including |
| more error detection in png_set_tRNS. |
| Cleaned up USER_LIMITS feature, removing members from png_struct when not |
| required. |
| Rearranged ARM-NEON optimizations to isolate the machine specific code to |
| the hardware subdirectory, and add comments to pngrutil.c so that |
| implementors of other optimizations will know what to do. |
| Fixed cases of unquoted DESTDIR in Makefile.am. |
| Rebuilt Makefile.in, configure, etc., with autoconf-2.69 and automake-1.12.5. |
| |
| Version 1.7.0alpha02 [December 17, 2012] |
| Removed functions that were deprecated in libpng-1.6.0: |
| png_reset_zstream(), png_info_init_3(), and png_data_freer() and its |
| associated flags. |
| Removed some duplicated lines from contrib/tools/scale.c and png.c. |
| Changed some instances of png_warning() to png_app_error(). |
| Updated some left over "1.6.0beta32" in code sources. |
| Fixed a "png_structp" prototype (should be png_structrp) in arm_init.c |
| Updated the version-number hack in pngvalid.c |
| |
| Version 1.7.0alpha03 [December 19, 2012] |
| Cleaned up and enhanced the configure option; libpng now correctly |
| links and tests against zlib with a prefix; tests have been clarified; and |
| irrelevant or obsolete things (as defined by the autotools man page) have |
| been removed. |
| Documented new PNG_ABORT behavior in the manual and commentary in pngerror.c |
| Cleaned up whitespace in the synopsis portion of the manpage "libpng.3" |
| Fixed previous support for Z_PREFIX in configure builds, corrected sCAL APIs; |
| some of these use floating point arithmetic so they need to be disabled if |
| floating point arithmetic is switched off. This is a quiet API change - |
| previously it appeared that the APIs were supported if fixed point |
| arithmetic was used internally, however they required certain APIs (floor, |
| modf, frexp, atof) that are part of C floating point support. Changed |
| png_fixed and the gamma code specific version of the same to avoid floor(), |
| which may be a library function (not an intrinsic). Removed unused #if 0 |
| code. |
| Disassembled the version number in scripts/options.awk (necessary for |
| building on SunOs). |
| |
| Version 1.7.0alpha04 [December 23, 2012] |
| Added scripts/makefile.msys contributed by Christopher M. Wheeler |
| Made default Zlib compression settings be configurable. This adds #defines to |
| pnglibconf.h to control the defaults. |
| Fixed Windows build issues, enabled ARM compilation. Various warnings issued |
| by earlier versions of GCC fixed for Cygwin and Min/GW (which both use old |
| GCCs.) ARM support is enabled by default in zlib.props (unsupported by |
| Microsoft) and ARM compilation is made possible by deleting the check for |
| x86. The test programs cannot be run because they are not signed. |
| |
| Version 1.7.0alpha05 [December 24, 2012] |
| Discontinued distributing libpng-1.x.x.tar.bz2. |
| Discontinued distributing libpng-1.7.0-1.6.0-diff.txt and similar. |
| |
| Version 1.7.0alpha06 [January 1, 2013] |
| Fixed 'make distcheck' on SUN OS - libpng.so was not being removed |
| |
| Version 1.7.0alpha07 [January 10, 2013] |
| Fixed conceivable but difficult to repro overflow. Also added two test |
| programs to generate and test a PNG which should have the problem. |
| |
| Version 1.7.0alpha08 [January 17, 2013] |
| Corrected previous attempt at overflow detection in png_set_unknown_chunks(). |
| |
| Version 1.7.0alpha09 [January 21, 2013] |
| Pulled changes to multi-chunk handling from libpng-1.6.0beta40. |
| |
| Version 1.7.0alpha10 [February 5, 2013] |
| Make symbol prefixing work with the ARM neon optimizations. Also |
| allow pngpriv.h to be included for preprocessor definitions only, so |
| it can be used in non-C/C++ files. |
| Added png_get_palette_max() function. |
| Changed png_size_t to size_t throughout headers, make sRGB check numbers |
| consistent. |
| Fixed ARM support (Mans Rullgard). |
| Removed stray out-of-order #endif and #ifdef (Mans Rullgard). |
| Ported libpng 1.5 options.awk/dfn file handling to 1.7, fixed one bug. |
| Rebuilt Makefile.in, configure, etc., with autoconf-2.69 and automake-1.13. |
| Minor fixes to assembler changes, verified with a dummy .S file |
| Removed cc -E workround, corrected png_get_palette_max API. Tested on |
| SUN OS cc 5.9, which demonstrates the tokenization problem previously |
| avoided by using /lib/cpp. Since all .dfn output is now protected |
| in double quotes unless it is to be macro substituted the fix should work |
| everywhere. |
| |
| Version 1.7.0beta01 [February 15, 2013] |
| Enable parallel tests and rearrange TESTS order to take advantage of |
| the massive speed improvements use a make capable of parallel builds |
| on a multi-CPU machine and pass the right arguments to make (-j10000 |
| for GNU make) to get the build to run in parallel. |
| Fixed previous support for Z_PREFIX in configure builds, corrected |
| sCAL APIs; some of these use floating point arithmetic so need to be |
| disabled if floating point arithmetic is switched off. This is a quiet API |
| change - previously it appeared that the APIs were supported if fixed point |
| arithmetic was used internally, however they required certain APIs (floor, |
| modf, frexp, atof) that are part of C floating point support. Changed |
| png_fixed and the gamma code specific version of the same to avoid floor(), |
| which may be a library function (not an intrinsic). Removed unused #if 0 |
| code. |
| Fixed make distcheck to skip over the test result files. They were |
| being included because the whole of the 'tests' directory is included, |
| fixed to just include the actual test files and tests/pngstest. Also |
| reverted the previous erroneous change to remove the ${srcdir} from the |
| front of contrib, scripts, projects and added an explanation of what is |
| going on to Makefile.am |
| Fixed missing dependency in --prefix builds. The intermediate |
| internal 'prefix.h' file can only be generated correctly after pnglibconf.h, |
| however the dependency was not in Makefile.am. The symptoms are |
| unpredictable depending on the order make chooses to build pngprefix.h and |
| pnglibconf.h, often the error goes unnoticed because there is a system |
| pnglibconf.h to use instead. |
| Accept "," as a separator in pnglibconf.dfa and allow for |
| continuation lines. This adds to the syntax of "option" and "chunk" lines, |
| allowing the elements to be separated by a "," at the end of an element and |
| interpreting a "," at end of line as a continuation - so the following line |
| is read. The new syntax is optional and solely provided for readability. |
| Enclosed the new png_get_palette_max in #ifdef PNG_GET_PALETTE_MAX_SUPPORTED |
| block, and revised pnglibconf.h and pnglibconf.h.prebuilt accordingly. |
| |
| Version 1.7.0beta02 [February 18, 2013] |
| Fixed a race condition in the creation of the build 'scripts' directory |
| while building with a parallel make. |
| Use approved/supported Android method to check for NEON, use Linux/POSIX |
| 1003.1 API to check /proc/self/auxv avoiding buffer allocation and other |
| library calls (ported from libpng15). |
| Use parentheses more consistently in "#if defined(MACRO)" tests. |
| Folded long lines. |
| |
| Version 1.7.0beta03 [February 22, 2013] |
| Reenabled code to allow zero length PLTE chunks for MNG. |
| Fixed ALIGNED_MEMORY support. |
| Allow run-time ARM NEON checking to be disabled. A new configure option: |
| --enable-arm-neon=always will stop the run-time checks. New checks |
| within arm/arm_init.c will cause the code not to be compiled unless |
| __ARM_NEON__ is set. This should make it fail safe (if someone asks |
| for it on then the build will fail if it can't be done.) |
| Updated the INSTALL document. |
| |
| Version 1.7.0beta04 [February 27, 2013] |
| Revised INSTALL to recommend using CPPFLAGS instead of INCLUDES. |
| Revised scripts/makefile.freebsd to respect ZLIBLIB and ZLIBINC. |
| Revised scripts/dfn.awk to work with the buggy MSYS awk that has trouble |
| with CRLF line endings. |
| |
| Version 1.7.0beta05 [March 5, 2013] |
| Avoid a possible memory leak in contrib/gregbook/readpng.c |
| Changed user chunk callback API to respect global and per chunk defaults. |
| Previously a return of 0 from a user chunk callback would result in the |
| chunk being saved (if this was safe, even if the chunk was unsafe-to-copy); |
| this change respects the defaults set by the application, so unknown chunks |
| can be discarded by default and known-safe ones preserved. |
| Corrected Android builds and corrected libpng.vers with symbol |
| prefixing. This adds an API to set optimization options externally, |
| providing an alternative and general solution for the non-portable |
| run-time tests used by the ARM Neon code. It also makes those tests |
| compile and link on Android. The order of settings vs options in |
| pnglibconf.h is reversed to allow settings to depend on options and |
| options can now set (or override) the defaults for settings. |
| |
| Version 1.7.0beta06 [March 13, 2013] |
| Corrected simplified API default gamma for color-mapped output, added |
| a flag to change default. In 1.6.0 when the simplified API was used |
| to produce color-mapped output from an input image with no gamma |
| information the gamma assumed for the input could be different from |
| that assumed for non-color-mapped output. In particular 16-bit depth |
| input files were assumed to be sRGB encoded, whereas in the 'direct' |
| case they were assumed to have linear data. This was an error. The |
| fix makes the simplified API treat all input files the same way and |
| adds a new flag to the png_image::flags member to allow the |
| application/user to specify that 16-bit files contain sRGB data |
| rather than the default linear. |
| Fixed bugs in the pngpixel and makepng test programs. |
| Fixed CMakelists.txt to allow building a single variant of the library |
| (Claudio Bley): |
| Introduced a PNG_LIB_TARGETS variable that lists all activated library |
| targets. It is an error if this variable ends up empty, ie. you have |
| to build at least one library variant. |
| Made the *_COPY targets only depend on library targets actually being build. |
| Use PNG_LIB_TARGETS to unify a code path. |
| Changed the CREATE_SYMLINK macro to expect the full path to a file as the |
| first argument. When symlinking the filename component of that path is |
| determined and used as the link target. |
| Use copy_if_different in the CREATE_SYMLINK macro. |
| Eliminated two warnings from the Intel C compiler. The warnings are |
| technically valid, although a reasonable treatment of division would |
| show it to be incorrect. |
| |
| Version 1.7.0beta07 [April 14, 2013] |
| Updated documentation of 1.5.x to 1.6.x changes in iCCP chunk handling. |
| Fixed incorrect warning of excess deflate data. End condition - the |
| warning would be produced if the end of the deflate stream wasn't read |
| in the last row. The warning is harmless. |
| Corrected the test on user transform changes on read. It was in the |
| png_set of the transform function, but that doesn't matter unless the |
| transform function changes the rowbuf size, and that is only valid if |
| transform_info is called. |
| Corrected a misplaced closing bracket in contrib/libtests/pngvalid.c |
| (Flavio Medeiros). |
| Corrected length written to uncompressed iTXt chunks (Samuli Suominen). |
| |
| Version 1.7.0beta08 [April 18, 2013] |
| Added contrib/tools/fixitxt.c, to repair the erroneous iTXt chunk length |
| written by libpng-1.6.0 and 1.6.1. |
| Disallow storing sRGB information when the sRGB is not supported. |
| |
| Version 1.7.0beta09 [April 24, 2013] |
| Exposed PNG chunk types in png.h |
| Modified png_uint_32 macros/code to make as few assumptions as possible |
| Revised stack marking in arm/filter_neon.S and configure.ac |
| Ensure that NEON filter stuff is completely disabled when switched 'off'. |
| Previously the ARM NEON specific files were still built if the option |
| was switched 'off' as opposed to being explicitly disabled. |
| |
| Version 1.7.0beta10 [April 24, 2013] |
| Attempt to fix the PNG_ARM_NEON configuration mess. |
| |
| Version 1.7.0beta11 [April 26, 2013] |
| Test for 'arm*', not just 'arm' in the host_cpu configure variable. |
| |
| Version 1.7.0beta12 [April 30, 2013] |
| Added png_app_warning for out-of-range unknown chunk index in |
| png_set_unknown_chunk_location(). |
| Expanded manual paragraph about writing private chunks. |
| Avoid dereferencing NULL pointer possibly returned from |
| png_create_write_struct() (Andrew Church). |
| |
| Version 1.7.0beta13 [May 12, 2013] |
| Revised contrib/pngminim/*/makefile to generate pnglibconf.h with the |
| right zlib header files. |
| Separated CPPFLAGS and CFLAGS in contrib/pngminim/*/makefile |
| Updated contrib/pngminus/pnm2png.c (Paul Stewart): |
| Check for EOF |
| Ignore "#" delimited comments in input file to pnm2png.c. |
| Fixed whitespace handling |
| Added a call to png_set_packing() |
| Initialize dimension values so if sscanf fails at least we have known |
| invalid values. |
| Calculate our own zlib windowBits when decoding rather than trusting the |
| CMF bytes in the PNG datastream. |
| Added an option to force maximum window size for inflating, which was |
| the behavior of libpng15 and earlier. |
| Added png-fix-itxt and png-fix-too-far-back to the built programs and |
| removed warnings from the source code and timepng that are revealed as |
| a result. |
| Detect wrong libpng versions linked to png-fix-too-far-back, which currently |
| only works with libpng versions that can be made to reliably fail when |
| the deflate data contains an out-of-window reference. This means only |
| 1.6 and later. |
| Attempt to detect configuration issues with png-fix-too-far-back, which |
| requires both the correct libpng and the correct zlib to function |
| correctly. |
| Check ZLIB_VERNUM for mismatches, enclose #error in quotes |
| Added information in the documentation about problems with and fixes for |
| the bad CRC and bad iTXt chunk situations. |
| |
| Version 1.7.0beta14 [June 8, 2013] |
| Removed a redundant test in png_set_IHDR(). |
| Added set(CMAKE_CONFIGURATION_TYPES ...) to CMakeLists.txt (Andrew Hundt) |
| Deleted set(CMAKE_BUILD_TYPE) block from CMakeLists.txt |
| Enclose the prototypes for the simplified write API in #ifdef STDIO/#endif |
| Make ARM NEON support work at compile time (not just configure time). |
| This moves the test on __ARM_NEON__ into pngconf.h to avoid issues when |
| using a compiler that compiles for multiple architectures at one time. |
| Removed PNG_FILTER_OPTIMIZATIONS and PNG_ARM_NEON_SUPPORTED from |
| pnglibconf.h, allowing more of the decisions to be made internally |
| (pngpriv.h) during the compile. Without this, symbol prefixing is broken |
| under certain circumstances on ARM platforms. Now only the API parts of |
| the optimizations ('check' vs 'api') are exposed in the public header files |
| except that the new setting PNG_ARM_NEON_OPT documents how libpng makes the |
| decision about whether or not to use the optimizations. |
| Protect symbol prefixing against CC/CPPFLAGS/CFLAGS useage. |
| Previous iOS/Xcode fixes for the ARM NEON optimizations moved the test |
| on __ARM_NEON__ from configure time to compile time. This breaks symbol |
| prefixing because the definition of the special png_init_filter_functions |
| call was hidden at configure time if the relevant compiler arguments are |
| passed in CFLAGS as opposed to CC. This change attempts to avoid all |
| the confusion that would result by declaring the init function even when |
| it is not used, so that it will always get prefixed. |
| |
| Version 1.7.0beta15 [June 18, 2013] |
| Revised libpng.3 so that "doclifter" can process it. |
| |
| Version 1.7.0beta16 [July 5, 2013] |
| Revised example.c to illustrate use of PNG_DEFAULT_sRGB and PNG_GAMMA_MAC_18 |
| as parameters for png_set_gamma(). These have been available since |
| libpng-1.5.4. |
| Renamed contrib/tools/png-fix-too-far-back.c to pngfix.c and revised it |
| to check all compressed chunks known to libpng. |
| Updated documentation to show default behavior of benign errors correctly. |
| Added perfect hash code generation for lists of PNG chunks. This is |
| a work in progress; checked in for use in pngfix.c |
| Ported ARM no-read patch from libpng16. |
| Ported pngfix.c patches from libpng16. |
| |
| Version 1.7.0beta17 [August 21, 2013] |
| Revised manual about changes in iTXt chunk handling made in libpng-1.6.0. |
| Added "/* SAFE */" comments in pngrutil.c and pngrtran.c where warnings |
| may be erroneously issued by code-checking applications. |
| Added information about png_set_options() to the manual. |
| Delay calling png_init_filter_functions() until a row with nonzero filter |
| is found. |
| |
| Version 1.7.0beta18 [September 16, 2013] |
| Fixed inconsistent conditional compilation of png_chunk_unknown_handling() |
| prototype, definition, and usage. Made it depend on |
| PNG_HANDLE_AS_UNKNOWN_SUPPORTED everywhere. |
| |
| Version 1.7.0beta19 [September 30, 2013] |
| Reverted the change to unknown handling #defines; the change breaks 'NOREAD' |
| builds. |
| Fixed default behavior of ARM_NEON_API. If the ARM NEON API option is |
| compiled without the CHECK option it defaulted to on, not off. |
| Catch up with recent libpng16 changes; unknown handling and spelling |
| corrections |
| Avoid up-cast warnings in pngvalid.c. On ARM the alignment requirements of |
| png_modifier are greater than that of png_store and as a consequence |
| compilation of pngvalid.c results in a warning about increased alignment |
| requirements because of the bare cast to (png_modifier*). The code is |
| safe, because the pointer is known to point to a stack allocated |
| png_modifier, but this change avoids the warning. |
| Fixed some grammatical changes and updated the png chunks list. |
| |
| Send comments/corrections/commendations to png-mng-implement at lists.sf.net |
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| or to glennrp at users.sourceforge.net |
| |
| Glenn R-P |