ChangeLog.txt - third_party/libjpeg-turbo - Git at Google

 1.0.2
 =====

 [1] Added further protections against invalid Huffman codes.

 [2] The algorithm used by the SIMD quantization function cannot produce correct
 results when the JPEG quality is >= 98 and the fast integer forward DCT is
 used.  Thus, the non-SIMD quantization function is now used for those cases,
 and libjpeg-turbo should now produce identical output to libjpeg v6b in all
 cases.

 [3] Despite the above, the fast integer forward DCT still degrades somewhat for
 JPEG qualities greater than 95, so TurboJPEG/OSS will now automatically use the
 slow integer forward DCT when generating JPEG images of quality 96 or greater.
 This reduces compression performance by as much as 15% for these high-quality
 images but is necessary to ensure that the images are perceptually lossless.
 It also ensures that the library can avoid the performance pitfall created by
 [2].

 [4] Fixed visual artifacts in grayscale JPEG compression caused by a typo in
 the RGB-to-chrominance lookup tables.

 [5] libjpeg-turbo's accelerated Huffman decoder previously ignored unexpected
 markers found in the middle of the JPEG data stream during decompression.  It
 will now hand off decoding of a particular block to the unaccelerated Huffman
 decoder if an unexpected marker is found, so that the unaccelerated Huffman
 decoder can generate an appropriate warning.

 [6] Older versions of MinGW64 prefixed symbol names with underscores by
 default, which differed from the behavior of 64-bit Visual C++.  MinGW64 1.0
 has adopted the behavior of 64-bit Visual C++ as the default, so to accommodate
 this, the libjpeg-turbo SIMD function names are no longer prefixed with an
 underscore when building with MinGW64.  This means that, when building
 libjpeg-turbo with older versions of MinGW64, you will now have to add
 -fno-leading-underscore to the CFLAGS.

 [6] Eliminated excessive I/O overhead that occurred when reading BMP files in
 cjpeg.

 [7] Eliminated errors in the output of cjpeg and jpegtran on Windows that
 occurred when the application was invoked using I/O redirection
 (cjpeg <inputfile >output.jpg).

 [8] Fixed an issue whereby Windows applications that used libjpeg-turbo would
 fail to compile if the Windows system headers were included before jpeglib.h.
 This issue was caused by a conflict in the definition of the INT32 type.

 [9] Fixed out-of-bounds read in SSE2 SIMD code that occurred when decompressing
 a JPEG image to a bitmap buffer whose size was not a multiple of 16 bytes.
 This was more of an annoyance than an actual bug, since it did not cause any
 actual run-time problems, but the issue showed up when running libjpeg-turbo in
 valgrind.  See http://crbug.com/72399 for more information.


 1.0.1
 =====

 [1] The Huffman decoder will now handle erroneous Huffman codes (for instance,
 from a corrupt JPEG image.)  Previously, these would cause libjpeg-turbo to
 crash under certain circumstances.

 [2] Fixed typo in SIMD dispatch routines which was causing 4:2:2 upsampling to
 be used instead of 4:2:0 when decompressing JPEG images using SSE2 code.

 [3] configure script will now automatically determine whether the
 INCOMPLETE_TYPES_BROKEN macro should be defined.


 1.0.0
 =====

 [1] 2983700: Further FreeBSD build tweaks (no longer necessary to specify
 --host when configuring on a 64-bit system)

 [2] Created sym. links in the Unix/Linux packages so that the TurboJPEG
 include file can always be found in /opt/libjpeg-turbo/include, the 32-bit
 static libraries can always be found in /opt/libjpeg-turbo/lib32, and the
 64-bit static libraries can always be found in /opt/libjpeg-turbo/lib64.

 [3] The Unix/Linux distribution packages now include the libjpeg run-time
 programs (cjpeg, etc.) and man pages.

 [4] Created a 32-bit supplementary package for amd64 Debian systems which
 contains just the 32-bit libjpeg-turbo libraries.

 [5] Moved the libraries from */lib32 to */lib in the i386 Debian package.

 [6] Include distribution package for Cygwin

 [7] No longer necessary to specify --without-simd on non-x86 architectures, and
 unit tests now work on those architectures.


 0.0.93
 ======

 [1] 2982659, Fixed x86-64 build on FreeBSD systems

 [2] 2988188: Added support for Windows 64-bit systems


 0.0.91
 ======

 [1] Added documentation to .deb packages

 [2] 2968313: Fixed data corruption issues when decompressing large JPEG images
 and/or using buffered I/O with the libjpeg-turbo decompressor


 0.0.90
 ======

 Initial release
	1.0.2
	=====

	[1] Added further protections against invalid Huffman codes.

	[2] The algorithm used by the SIMD quantization function cannot produce correct
	results when the JPEG quality is >= 98 and the fast integer forward DCT is
	used. Thus, the non-SIMD quantization function is now used for those cases,
	and libjpeg-turbo should now produce identical output to libjpeg v6b in all
	cases.

	[3] Despite the above, the fast integer forward DCT still degrades somewhat for
	JPEG qualities greater than 95, so TurboJPEG/OSS will now automatically use the
	slow integer forward DCT when generating JPEG images of quality 96 or greater.
	This reduces compression performance by as much as 15% for these high-quality
	images but is necessary to ensure that the images are perceptually lossless.
	It also ensures that the library can avoid the performance pitfall created by
	[2].

	[4] Fixed visual artifacts in grayscale JPEG compression caused by a typo in
	the RGB-to-chrominance lookup tables.

	[5] libjpeg-turbo's accelerated Huffman decoder previously ignored unexpected
	markers found in the middle of the JPEG data stream during decompression. It
	will now hand off decoding of a particular block to the unaccelerated Huffman
	decoder if an unexpected marker is found, so that the unaccelerated Huffman
	decoder can generate an appropriate warning.

	[6] Older versions of MinGW64 prefixed symbol names with underscores by
	default, which differed from the behavior of 64-bit Visual C++. MinGW64 1.0
	has adopted the behavior of 64-bit Visual C++ as the default, so to accommodate
	this, the libjpeg-turbo SIMD function names are no longer prefixed with an
	underscore when building with MinGW64. This means that, when building
	libjpeg-turbo with older versions of MinGW64, you will now have to add
	-fno-leading-underscore to the CFLAGS.

	[6] Eliminated excessive I/O overhead that occurred when reading BMP files in
	cjpeg.

	[7] Eliminated errors in the output of cjpeg and jpegtran on Windows that
	occurred when the application was invoked using I/O redirection
	(cjpeg <inputfile >output.jpg).

	[8] Fixed an issue whereby Windows applications that used libjpeg-turbo would
	fail to compile if the Windows system headers were included before jpeglib.h.
	This issue was caused by a conflict in the definition of the INT32 type.

	[9] Fixed out-of-bounds read in SSE2 SIMD code that occurred when decompressing
	a JPEG image to a bitmap buffer whose size was not a multiple of 16 bytes.
	This was more of an annoyance than an actual bug, since it did not cause any
	actual run-time problems, but the issue showed up when running libjpeg-turbo in
	valgrind. See http://crbug.com/72399 for more information.


	1.0.1
	=====

	[1] The Huffman decoder will now handle erroneous Huffman codes (for instance,
	from a corrupt JPEG image.) Previously, these would cause libjpeg-turbo to
	crash under certain circumstances.

	[2] Fixed typo in SIMD dispatch routines which was causing 4:2:2 upsampling to
	be used instead of 4:2:0 when decompressing JPEG images using SSE2 code.

	[3] configure script will now automatically determine whether the
	INCOMPLETE_TYPES_BROKEN macro should be defined.


	1.0.0
	=====

	[1] 2983700: Further FreeBSD build tweaks (no longer necessary to specify
	--host when configuring on a 64-bit system)

	[2] Created sym. links in the Unix/Linux packages so that the TurboJPEG
	include file can always be found in /opt/libjpeg-turbo/include, the 32-bit
	static libraries can always be found in /opt/libjpeg-turbo/lib32, and the
	64-bit static libraries can always be found in /opt/libjpeg-turbo/lib64.

	[3] The Unix/Linux distribution packages now include the libjpeg run-time
	programs (cjpeg, etc.) and man pages.

	[4] Created a 32-bit supplementary package for amd64 Debian systems which
	contains just the 32-bit libjpeg-turbo libraries.

	[5] Moved the libraries from /lib32 to /lib in the i386 Debian package.

	[6] Include distribution package for Cygwin

	[7] No longer necessary to specify --without-simd on non-x86 architectures, and
	unit tests now work on those architectures.


	0.0.93
	======

	[1] 2982659, Fixed x86-64 build on FreeBSD systems

	[2] 2988188: Added support for Windows 64-bit systems


	0.0.91
	======

	[1] Added documentation to .deb packages

	[2] 2968313: Fixed data corruption issues when decompressing large JPEG images
	and/or using buffered I/O with the libjpeg-turbo decompressor


	0.0.90
	======

	Initial release