libjpeg-turbo-1.4.1

[Fernando de Oliveira]

​http://downloads.sourceforge.net/libjpeg-turbo/libjpeg-turbo-1.4.1.tar.gz

md5 b1f6b84859a16b8ebdcda951fa07c3f2

​http://sourceforge.net/p/libjpeg-turbo/mailman/message/34186583/

Significant changes since 1.4.0
===============================

[1] tjbench now properly handles CMYK/YCCK JPEG files.  Passing an
argument of -cmyk (instead of, for instance, -rgb) will cause tjbench to
internally convert the source bitmap to CMYK prior to compression, to
generate YCCK JPEG files, and to internally convert the decompressed
CMYK pixels back to RGB after decompression (the latter is done
automatically if a CMYK or YCCK JPEG is passed to tjbench as a source
image.)  The CMYK<->RGB conversion operation is not benchmarked.  NOTE:
The quick & dirty CMYK<->RGB conversions that tjbench uses are suitable
for testing only.  Proper conversion between CMYK and RGB requires a
color management system.

[2] 'make test' now performs additional bitwise regression tests using
tjbench, mainly for the purpose of testing compression
from/decompression to a subregion of a larger image buffer.

[3] 'make test' no longer tests the regression of the floating point
DCT/IDCT by default, since the results of those tests can vary if the
algorithms in question are not implemented using SIMD instructions on a
particular platform.  See the comments in Makefile.am for information on
how to re-enable the tests and to specify an expected result for them
based on the particulars of your platform.

[4] The NULL color conversion routines have been significantly
optimized, which speeds up the compression of RGB and CMYK JPEGs by
5-20% when using 64-bit code and 0-3% when using 32-bit code, and the
decompression of those images by 10-30% when using 64-bit code and 3-12%
when using 32-bit code.

[5] Fixed an "illegal instruction" error that occurred when djpeg from a
SIMD-enabled libjpeg-turbo MIPS build was executed with the -nosmooth
option on a MIPS machine that lacked DSPr2 support.  The MIPS SIMD
routines for h2v1 and h2v2 merged upsampling were not properly checking
for the existence of DSPr2.

[6] Performance has been improved significantly on 64-bit non-Linux and
non-Windows platforms (generally 10-20% faster compression and 5-10%
faster decompression.)  Due to an oversight, the 64-bit version of the
accelerated Huffman codec was not being compiled in when libjpeg-turbo
was built on platforms other than Windows or Linux.  Oops.

[7] Fixed an extremely rare bug in the Huffman encoder that caused
64-bit builds of libjpeg-turbo to incorrectly encode a few specific test
images when quality=98, an optimized Huffman table, and the slow integer
forward DCT were used.

[8] The Windows (CMake) build system now supports building only static
or only shared libraries.  This is accomplished by adding either
-DENABLE_STATIC=0 or -DENABLE_SHARED=0 to the CMake command line.

[9] TurboJPEG API functions will now return an error code if a warning
is triggered in the underlying libjpeg API.  For instance, if a JPEG
file is corrupt, the TurboJPEG decompression functions will attempt to
decompress as much of the image as possible, but those functions will
now return -1 to indicate that the decompression was not entirely
successful.

[10] Fixed a bug in the MIPS DSPr2 4:2:2 fancy upsampling routine that
caused a buffer overflow (and subsequent segfault) when decompressing a
4:2:2 JPEG image in which the right-most MCU was 5 or 6 pixels wide.

[Fernando de Oliveira]

Fixed at r16102.