JPEG image codec C library
libjpeg-turbo is a JPEG image codec that uses SIMD instructions to accelerate
baseline JPEG compression and decompression on x86, x86-64, Arm, PowerPC, and
MIPS systems, as well as progressive JPEG compression on x86, x86-64, and Arm
systems. On such systems, libjpeg-turbo is generally 2-6x as fast as libjpeg,
all else being equal. On other types of systems, libjpeg-turbo can still
outperform libjpeg by a significant amount, by virtue of its highly-optimized
Huffman coding routines. In many cases, the performance of libjpeg-turbo
rivals that of proprietary high-speed JPEG codecs.
Builds
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x86_64-linux-gnu |
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2024-04-27 20:13:53 UTC (07:20:07 hours ago) |
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2024-04-27 20:05:47 UTC (07:28:13 hours ago) |
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2024-04-27 20:04:37 UTC (07:29:23 hours ago) |
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public-0.16.0 |
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x86_64-linux-gnu |
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2024-04-27 20:03:17 UTC (07:30:43 hours ago) |
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2024-04-27 19:57:45 UTC (07:36:15 hours ago) |
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aarch64-linux-gnu |
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2024-04-26 21:11:25 UTC (01 06:22:35 days ago) |
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public-0.16.0 |
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aarch64-linux-gnu |
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linux_debian_12-gcc_13-O3 |
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2024-04-26 21:10:05 UTC (01 06:23:55 days ago) |
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toolchain |
public-0.16.0 |
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aarch64-linux-gnu |
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linux_debian_12-clang_16_libc++-static_O3 |
timestamp |
2024-04-26 19:07:51 UTC (01 08:26:09 days ago) |
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public-0.16.0 |
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aarch64-linux-gnu |
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linux_debian_12-clang_16_libc++-O3 |
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2024-04-26 19:07:33 UTC (01 08:26:28 days ago) |
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public-0.16.0 |
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aarch64-linux-gnu |
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2024-04-26 19:07:18 UTC (01 08:26:42 days ago) |
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public-0.16.0 |
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aarch64-linux-gnu |
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linux_debian_12-clang_16_libc++ |
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2024-04-26 19:06:59 UTC (01 08:27:01 days ago) |
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public-0.16.0 |
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aarch64-linux-gnu |
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2024-04-26 19:06:45 UTC (01 08:27:15 days ago) |
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public-0.16.0 |
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aarch64-linux-gnu |
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linux_debian_12-clang_15_libc++ |
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2024-04-26 00:49:48 UTC (02 02:44:12 days ago) |
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x86_64-linux-gnu |
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Changes
2.1.3
Significant changes relative to 2.1.2
-
Fixed a regression introduced by 2.0 beta1[7] whereby cjpeg compressed PGM
input files into full-color JPEG images unless the -grayscale
option was
used.
-
cjpeg now automatically compresses GIF and 8-bit BMP input files into
grayscale JPEG images if the input files contain only shades of gray.
-
The build system now enables the intrinsics implementation of the AArch64
(Arm 64-bit) Neon SIMD extensions by default when using GCC 12 or later.
-
Fixed a segfault that occurred while decompressing a 4:2:0 JPEG image using
the merged (non-fancy) upsampling algorithms (that is, with
cinfo.do_fancy_upsampling
set to FALSE
) along with jpeg_crop_scanline()
.
Specifically, the segfault occurred if the number of bytes remaining in the
output buffer was less than the number of bytes required to represent one
uncropped scanline of the output image. For that reason, the issue could only
be reproduced using the libjpeg API, not using djpeg.
2.1.2
Significant changes relative to 2.1.1
-
Fixed a regression introduced by 2.1 beta1[13] that caused the remaining
GAS implementations of AArch64 (Arm 64-bit) Neon SIMD functions (which are used
by default with GCC for performance reasons) to be placed in the .rodata
section rather than in the .text
section. This caused the GNU linker to
automatically place the .rodata
section in an executable segment, which
prevented libjpeg-turbo from working properly with other linkers and also
represented a potential security risk.
-
Fixed an issue whereby the tjTransform()
function incorrectly computed the
MCU block size for 4:4:4 JPEG images with non-unary sampling factors and thus
unduly rejected some cropping regions, even though those regions aligned with
8x8 MCU block boundaries.
-
Fixed a regression introduced by 2.1 beta1[13] that caused the build system
to enable the Arm Neon SIMD extensions when targetting Armv6 and other legacy
architectures that do not support Neon instructions.
-
libjpeg-turbo now performs run-time detection of AltiVec instructions on
FreeBSD/PowerPC systems if AltiVec instructions are not enabled at compile
time. This allows both AltiVec-equipped and non-AltiVec-equipped CPUs to be
supported using the same build of libjpeg-turbo.
-
cjpeg now accepts a -strict
argument similar to that of djpeg and
jpegtran, which causes the compressor to abort if an LZW-compressed GIF input
image contains incomplete or corrupt image data.
2.1.1
Significant changes relative to 2.1.0
-
Fixed a regression introduced in 2.1.0 that caused build failures with
non-GCC-compatible compilers for Un*x/Arm platforms.
-
Fixed a regression introduced by 2.1 beta1[13] that prevented the Arm 32-bit
(AArch32) Neon SIMD extensions from building unless the C compiler flags
included -mfloat-abi=softfp
or -mfloat-abi=hard
.
-
Fixed an issue in the AArch32 Neon SIMD Huffman encoder whereby reliance on
undefined C compiler behavior led to crashes ("SIGBUS: illegal alignment") on
Android systems when running AArch32/Thumb builds of libjpeg-turbo built with
recent versions of Clang.
-
Added a command-line argument (-copy icc
) to jpegtran that causes it to
copy only the ICC profile markers from the source file and discard any other
metadata.
-
libjpeg-turbo should now build and run on CHERI-enabled architectures, which
use capability pointers that are larger than the size of size_t
.
-
Fixed a regression (CVE-2021-37972) introduced by 2.1 beta1[5] that caused a
segfault in the 64-bit SSE2 Huffman encoder when attempting to losslessly
transform a specially-crafted malformed JPEG image.
2.1.0
Significant changes relative to 2.1 beta1
-
Fixed a regression introduced by 2.1 beta1[6(b)] whereby attempting to
decompress certain progressive JPEG images with one or more component planes of
width 8 or less caused a buffer overrun.
-
Fixed a regression introduced by 2.1 beta1[6(b)] whereby attempting to
decompress a specially-crafted malformed progressive JPEG image caused the
block smoothing algorithm to read from uninitialized memory.
-
Fixed an issue in the Arm Neon SIMD Huffman encoders that caused the
encoders to generate incorrect results when using the Clang compiler with
Visual Studio.
-
Fixed a floating point exception (CVE-2021-20205) that occurred when
attempting to compress a specially-crafted malformed GIF image with a specified
image width of 0 using cjpeg.
-
Fixed a regression introduced by 2.0 beta1[15] whereby attempting to
generate a progressive JPEG image on an SSE2-capable CPU using a scan script
containing one or more scans with lengths divisible by 32 and non-zero
successive approximation low bit positions would, under certain circumstances,
result in an error ("Missing Huffman code table entry") and an invalid JPEG
image.
-
Introduced a new flag (TJFLAG_LIMITSCANS
in the TurboJPEG C API and
TJ.FLAG_LIMIT_SCANS
in the TurboJPEG Java API) and a corresponding TJBench
command-line argument (-limitscans
) that causes the TurboJPEG decompression
and transform functions/operations to return/throw an error if a progressive
JPEG image contains an unreasonably large number of scans. This allows
applications that use the TurboJPEG API to guard against an exploit of the
progressive JPEG format described in the report
"Two Issues with the JPEG Standard".
-
The PPM reader now throws an error, rather than segfaulting (due to a buffer
overrun) or generating incorrect pixels, if an application attempts to use the
tjLoadImage()
function to load a 16-bit binary PPM file (a binary PPM file
with a maximum value greater than 255) into a grayscale image buffer or to load
a 16-bit binary PGM file into an RGB image buffer.
-
Fixed an issue in the PPM reader that caused incorrect pixels to be
generated when using the tjLoadImage()
function to load a 16-bit binary PPM
file into an extended RGB image buffer.
-
Fixed an issue whereby, if a JPEG buffer was automatically re-allocated by
one of the TurboJPEG compression or transform functions and an error
subsequently occurred during compression or transformation, the JPEG buffer
pointer passed by the application was not updated when the function returned.