4
[1] Creating or decoding a JPEG file that uses the RGB colorspace should now
5
properly work when the input or output colorspace is one of the libjpeg-turbo
8
[2] When libjpeg-turbo was built without SIMD support and merged (non-fancy)
9
upsampling was used along with an alpha-enabled colorspace during
10
decompression, the unused byte of the decompressed pixels was not being set to
11
0xFF. This has been fixed. TJUnitTest has also been extended to test for the
12
correct behavior of the colorspace extensions when merged upsampling is used.
14
[3] Fixed a bug whereby the libjpeg-turbo SSE2 SIMD code would not preserve the
15
upper 64 bits of xmm6 and xmm7 on Win64 platforms, which violated the Win64
18
[4] Fixed a regression caused by 1.2.0[6] whereby decompressing corrupt JPEG
19
images (specifically, images in which the component count was erroneously set
20
to a large value) would cause libjpeg-turbo to segfault.
22
[5] Worked around a severe performance issue with "Bobcat" (AMD Embedded APU)
23
processors. The MASKMOVDQU instruction, which was used by the libjpeg-turbo
24
SSE2 SIMD code, is apparently implemented in microcode on AMD processors, and
25
it is painfully slow on Bobcat processors in particular. Eliminating the use
26
of this instruction improved performance by an order of magnitude on Bobcat
27
processors and by a small amount (typically 5%) on AMD desktop processors.
29
[6] Added SIMD acceleration for performing 4:2:2 upsampling on NEON-capable ARM
30
platforms. This speeds up the decompression of 4:2:2 JPEGs by 20-25% on such
33
[7] Fixed a regression caused by 1.2.0[2] whereby, on Linux/x86 platforms
34
running the 32-bit SSE2 SIMD code in libjpeg-turbo, decompressing a 4:2:0 or
35
4:2:2 JPEG image into a 32-bit (RGBX, BGRX, etc.) buffer without using fancy
36
upsampling would produce several incorrect columns of pixels at the right-hand
37
side of the output image if each row in the output image was not evenly
38
divisible by 16 bytes.
40
[8] Fixed an issue whereby attempting to build the SIMD extensions with Xcode
41
4.3 on OS X platforms would cause NASM to return numerous errors of the form
42
"'%define' expects a macro identifier".
44
[9] Added flags to the TurboJPEG API that allow the caller to force the use of
45
either the fast or the accurate DCT/IDCT algorithms in the underlying codec.
51
[1] Fixed build issue with YASM on Unix systems (the libjpeg-turbo build system
52
was not adding the current directory to the assembler include path, so YASM
53
was not able to find jsimdcfg.inc.)
55
[2] Fixed out-of-bounds read in SSE2 SIMD code that occurred when decompressing
56
a JPEG image to a bitmap buffer whose size was not a multiple of 16 bytes.
57
This was more of an annoyance than an actual bug, since it did not cause any
58
actual run-time problems, but the issue showed up when running libjpeg-turbo in
59
valgrind. See http://crbug.com/72399 for more information.
61
[3] Added a compile-time macro (LIBJPEG_TURBO_VERSION) that can be used to
62
check the version of libjpeg-turbo against which an application was compiled.
64
[4] Added new RGBA/BGRA/ABGR/ARGB colorspace extension constants (libjpeg API)
65
and pixel formats (TurboJPEG API), which allow applications to specify that,
66
when decompressing to a 4-component RGB buffer, the unused byte should be set
67
to 0xFF so that it can be interpreted as an opaque alpha channel.
69
[5] Fixed regression issue whereby DevIL failed to build against libjpeg-turbo
70
because libjpeg-turbo's distributed version of jconfig.h contained an INLINE
71
macro, which conflicted with a similar macro in DevIL. This macro is used only
72
internally when building libjpeg-turbo, so it was moved into config.h.
74
[6] libjpeg-turbo will now correctly decompress erroneous CMYK/YCCK JPEGs whose
75
K component is assigned a component ID of 1 instead of 4. Although these files
76
are in violation of the spec, other JPEG implementations handle them
79
[7] Added ARM v6 and ARM v7 architectures to libjpeg.a and libturbojpeg.a in
80
the official OS X distribution package, so that those libraries can be used to
81
build both OS X and iOS applications.
87
[1] Added a Java wrapper for the TurboJPEG API. See java/README for more
90
[2] The TurboJPEG API can now be used to scale down images during
93
[3] Added SIMD routines for RGB-to-grayscale color conversion, which
94
significantly improves the performance of grayscale JPEG compression from an
97
[4] Improved the performance of the C color conversion routines, which are used
98
on platforms for which SIMD acceleration is not available.
100
[5] Added a function to the TurboJPEG API that performs lossless transforms.
101
This function is implemented using the same back end as jpegtran, but it
102
performs transcoding entirely in memory and allows multiple transforms and/or
103
crop operations to be batched together, so the source coefficients only need to
104
be read once. This is useful when generating image tiles from a single source
107
[6] Added tests for the new TurboJPEG scaled decompression and lossless
108
transform features to tjbench (the TurboJPEG benchmark, formerly called
111
[7] Added support for 4:4:0 (transposed 4:2:2) subsampling in TurboJPEG, which
112
was necessary in order for it to read 4:2:2 JPEG files that had been losslessly
113
transposed or rotated 90 degrees.
115
[8] All legacy VirtualGL code has been re-factored, and this has allowed
116
libjpeg-turbo, in its entirety, to be re-licensed under a BSD-style license.
118
[9] libjpeg-turbo can now be built with YASM.
120
[10] Added SIMD acceleration for ARM Linux and iOS platforms that support
123
[11] Refactored the TurboJPEG C API and documented it using Doxygen. The
124
TurboJPEG 1.2 API uses pixel formats to define the size and component order of
125
the uncompressed source/destination images, and it includes a more efficient
126
version of TJBUFSIZE() that computes a worst-case JPEG size based on the level
127
of chrominance subsampling. The refactored implementation of TurboJPEG/OSS
128
now uses the libjpeg memory source and destination managers, which allows the
129
TurboJPEG compressor to grow the JPEG buffer as necessary.
131
[12] Eliminated errors in the output of jpegtran on Windows that occurred when
132
the application was invoked using I/O redirection
133
(jpegtran <input.jpg >output.jpg).
135
[13] The inclusion of libjpeg v7 and v8 emulation as well as arithmetic coding
136
support in libjpeg-turbo v1.1.0 introduced several new error constants in
137
jerror.h, and these were mistakenly enabled for all emulation modes, causing
138
the error enum in libjpeg-turbo to sometimes have different values than the
139
same enum in libjpeg. This represents an ABI incompatibility, and it caused
140
problems with rare applications that took specific action based on a particular
141
error value. The fix was to include the new error constants conditionally
142
based on whether libjpeg v7 or v8 emulation was enabled.
144
[14] Fixed an issue whereby Windows applications that used libjpeg-turbo would
145
fail to compile if the Windows system headers were included before jpeglib.h.
146
This issue was caused by a conflict in the definition of the INT32 type.
148
[15] Fixed 32-bit supplementary package for amd64 Debian systems, which was
149
broken by enhancements to the packaging system in 1.1.
151
[16] When decompressing a JPEG image using an output colorspace of
152
JCS_EXT_RGBX, JCS_EXT_BGRX, JCS_EXT_XBGR, or JCS_EXT_XRGB, libjpeg-turbo will
153
now set the unused byte to 0xFF, which allows applications to interpret that
154
byte as an alpha channel (0xFF = opaque).
160
[1] Fixed a 1-pixel error in row 0, column 21 of the luminance plane generated
163
[2] libjpeg-turbo's accelerated Huffman decoder previously ignored unexpected
164
markers found in the middle of the JPEG data stream during decompression. It
165
will now hand off decoding of a particular block to the unaccelerated Huffman
166
decoder if an unexpected marker is found, so that the unaccelerated Huffman
167
decoder can generate an appropriate warning.
169
[3] Older versions of MinGW64 prefixed symbol names with underscores by
170
default, which differed from the behavior of 64-bit Visual C++. MinGW64 1.0
171
has adopted the behavior of 64-bit Visual C++ as the default, so to accommodate
172
this, the libjpeg-turbo SIMD function names are no longer prefixed with an
173
underscore when building with MinGW64. This means that, when building
174
libjpeg-turbo with older versions of MinGW64, you will now have to add
175
-fno-leading-underscore to the CFLAGS.
177
[4] Fixed a regression bug in the NSIS script that caused the Windows installer
178
build to fail when using the Visual Studio IDE.
180
[5] Fixed a bug in jpeg_read_coefficients() whereby it would not initialize
181
cinfo->image_width and cinfo->image_height if libjpeg v7 or v8 emulation was
182
enabled. This specifically caused the jpegoptim program to fail if it was
183
linked against a version of libjpeg-turbo that was built with libjpeg v7 or v8
186
[6] Eliminated excessive I/O overhead that occurred when reading BMP files in
189
[7] Eliminated errors in the output of cjpeg on Windows that occurred when the
190
application was invoked using I/O redirection (cjpeg <inputfile >output.jpg).
196
[1] The algorithm used by the SIMD quantization function cannot produce correct
197
results when the JPEG quality is >= 98 and the fast integer forward DCT is
198
used. Thus, the non-SIMD quantization function is now used for those cases,
199
and libjpeg-turbo should now produce identical output to libjpeg v6b in all
202
[2] Despite the above, the fast integer forward DCT still degrades somewhat for
203
JPEG qualities greater than 95, so TurboJPEG/OSS will now automatically use the
204
slow integer forward DCT when generating JPEG images of quality 96 or greater.
205
This reduces compression performance by as much as 15% for these high-quality
206
images but is necessary to ensure that the images are perceptually lossless.
207
It also ensures that the library can avoid the performance pitfall created by
210
[3] Ported jpgtest.cxx to pure C to avoid the need for a C++ compiler.
212
[4] Fixed visual artifacts in grayscale JPEG compression caused by a typo in
213
the RGB-to-luminance lookup tables.
215
[5] The Windows distribution packages now include the libjpeg run-time programs
218
[6] All packages now include jpgtest.
220
[7] The TurboJPEG dynamic library now uses versioned symbols.
222
[8] Added two new TurboJPEG API functions, tjEncodeYUV() and
223
tjDecompressToYUV(), to replace the somewhat hackish TJ_YUV flag.
229
[1] Added emulation of the libjpeg v7 and v8 APIs and ABIs. See
230
README-turbo.txt for more details. This feature was sponsored by CamTrace SAS.
232
[2] Created a new CMake-based build system for the Visual C++ and MinGW builds.
234
[3] Grayscale bitmaps can now be compressed from/decompressed to using the
237
[4] jpgtest can now be used to test decompression performance with existing
240
[5] If the default install prefix (/opt/libjpeg-turbo) is used, then
241
'make install' now creates /opt/libjpeg-turbo/lib32 and
242
/opt/libjpeg-turbo/lib64 sym links to duplicate the behavior of the binary
245
[6] All symbols in the libjpeg-turbo dynamic library are now versioned, even
246
when the library is built with libjpeg v6b emulation.
248
[7] Added arithmetic encoding and decoding support (can be disabled with
249
configure or CMake options)
251
[8] Added a TJ_YUV flag to the TurboJPEG API, which causes both the compressor
252
and decompressor to output planar YUV images.
254
[9] Added an extended version of tjDecompressHeader() to the TurboJPEG API,
255
which allows the caller to determine the type of subsampling used in a JPEG
258
[10] Added further protections against invalid Huffman codes.
264
[1] The Huffman decoder will now handle erroneous Huffman codes (for instance,
265
from a corrupt JPEG image.) Previously, these would cause libjpeg-turbo to
266
crash under certain circumstances.
268
[2] Fixed typo in SIMD dispatch routines that was causing 4:2:2 upsampling to
269
be used instead of 4:2:0 when decompressing JPEG images using SSE2 code.
271
[3] configure script will now automatically determine whether the
272
INCOMPLETE_TYPES_BROKEN macro should be defined.
278
[1] 2983700: Further FreeBSD build tweaks (no longer necessary to specify
279
--host when configuring on a 64-bit system)
281
[2] Created sym. links in the Unix/Linux packages so that the TurboJPEG
282
include file can always be found in /opt/libjpeg-turbo/include, the 32-bit
283
static libraries can always be found in /opt/libjpeg-turbo/lib32, and the
284
64-bit static libraries can always be found in /opt/libjpeg-turbo/lib64.
286
[3] The Unix/Linux distribution packages now include the libjpeg run-time
287
programs (cjpeg, etc.) and man pages.
289
[4] Created a 32-bit supplementary package for amd64 Debian systems, which
290
contains just the 32-bit libjpeg-turbo libraries.
292
[5] Moved the libraries from */lib32 to */lib in the i386 Debian package.
294
[6] Include distribution package for Cygwin
296
[7] No longer necessary to specify --without-simd on non-x86 architectures, and
297
unit tests now work on those architectures.
303
[1] 2982659, Fixed x86-64 build on FreeBSD systems
305
[2] 2988188: Added support for Windows 64-bit systems
311
[1] Added documentation to .deb packages
313
[2] 2968313: Fixed data corruption issues when decompressing large JPEG images
314
and/or using buffered I/O with the libjpeg-turbo decompressor
added
removed
.pc/branch-updates.diff/ChangeLog.txt
