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97772cba
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2022-11-14T15:36:25
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Merge branch 'ijg.lossless' into dev
Refer to #402
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217d1a75
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2022-11-08T15:01:18
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Clean up the lossless JPEG feature
- Rename jpeg_simple_lossless() to jpeg_enable_lossless() and modify the
function so that it stores the lossless parameters directly in the Ss
and Al fields of jpeg_compress_struct rather than using a scan script.
- Move the cjpeg -lossless switch into "Switches for advanced users".
- Document the libjpeg API and run-time features that are unavailable in
lossless mode, and ensure that all parameters, functions, and switches
related to unavailable features are ignored or generate errors in
lossless mode.
- Defer any action that depends on whether lossless mode is enabled
until jpeg_start_compress()/jpeg_start_decompress() is called.
- Document the purpose of the point transform value.
- "Codec" stands for coder/decoder, so it is a bit awkward to say
"lossless compression codec" and "lossless decompression codec".
Use "lossless compressor" and "lossless decompressor" instead.
- Restore backward API/ABI compatibility with libjpeg v6b:
* Move the new 'lossless' field from the exposed jpeg_compress_struct
and jpeg_decompress_struct structures into the opaque
jpeg_comp_master and jpeg_decomp_master structures, and allocate the
master structures in the body of jpeg_create_compress() and
jpeg_create_decompress().
* Remove the new 'process' field from jpeg_compress_struct and
jpeg_decompress_struct and replace it with the old
'progressive_mode' field and the new 'lossless' field.
* Remove the new 'data_unit' field from jpeg_compress_struct and
jpeg_decompress_struct and replace it with a locally-computed
data unit variable.
* Restore the names of macros and fields that refer to DCT blocks, and
document that they have a different meaning in lossless mode. (Most
of them aren't very meaningful in lossless mode anyhow.)
* Remove the new alloc_darray() method from jpeg_memory_mgr and
replace it with an internal macro that wraps the alloc_sarray()
method.
* Move the JDIFF* data types from jpeglib.h and jmorecfg.h into
jpegint.h.
* Remove the new 'codec' field from jpeg_compress_struct and
jpeg_decompress_struct and instead reuse the existing internal
coefficient control, forward/inverse DCT, and entropy
encoding/decoding structures for lossless compression/decompression.
* Repurpose existing error codes rather than introducing new ones.
(The new JERR_BAD_RESTART and JWRN_MUST_DOWNSCALE codes remain,
although JWRN_MUST_DOWNSCALE will probably be removed in
libjpeg-turbo, since we have a different way of handling multiple
data precisions.)
- Automatically enable lossless mode when a scan script with parameters
that are only valid for lossless mode is detected, and document the
use of scan scripts to generate lossless JPEG images.
- Move the sequential and shared Huffman routines back into jchuff.c and
jdhuff.c, and document that those routines are shared with jclhuff.c
and jdlhuff.c as well as with jcphuff.c and jdphuff.c.
- Move MAX_DIFF_BITS from jchuff.h into jclhuff.c, the only place where
it is used.
- Move the predictor and scaler code into jclossls.c and jdlossls.c.
- Streamline register usage in the [un]differencers (inspired by similar
optimizations in the color [de]converters.)
- Restructure the logic in a few places to reduce duplicated code.
- Ensure that all lossless-specific code is guarded by
C_LOSSLESS_SUPPORTED or D_LOSSLESS_SUPPORTED and that the library can
be built successfully if either or both of those macros is undefined.
- Remove all short forms of external names introduced by the lossless
JPEG patch. (These will not be needed by libjpeg-turbo, so there is
no use cleaning them up.)
- Various wordsmithing, formatting, and punctuation tweaks
- Eliminate various compiler warnings.
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bf01ed2f
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2022-11-04T13:08:08
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Fix build when SIMD extensions are disabled
(Broken by previous commit)
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e8b40f3c
|
2022-11-01T21:45:39
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|
Vastly improve 12-bit JPEG integration
The Gordian knot that 7fec5074f962b20ed00b4f5da4533e1e8d4ed8ac attempted
to unravel was caused by the fact that there are several
data-precision-dependent (JSAMPLE-dependent) fields and methods in the
exposed libjpeg API structures, and if you change the exposed libjpeg
API structures, then you have to change the whole API. If you change
the whole API, then you have to provide a whole new library to support
the new API, and that makes it difficult to support multiple data
precisions in the same application. (It is not impossible, as example.c
demonstrated, but using data-precision-dependent libjpeg API structures
would have made the cjpeg, djpeg, and jpegtran source code hard to read,
so it made more sense to build, install, and package 12-bit-specific
versions of those applications.)
Unfortunately, the result of that initial integration effort was an
unreadable and unmaintainable mess, which is a problem for a library
that is an ISO/ITU-T reference implementation. Also, as I dug into the
problem of lossless JPEG support, I realized that 16-bit lossless JPEG
images are a thing, and supporting yet another version of the libjpeg
API just for those images is untenable.
In fact, however, the touch points for JSAMPLE in the exposed libjpeg
API structures are minimal:
- The colormap and sample_range_limit fields in jpeg_decompress_struct
- The alloc_sarray() and access_virt_sarray() methods in
jpeg_memory_mgr
- jpeg_write_scanlines() and jpeg_write_raw_data()
- jpeg_read_scanlines() and jpeg_read_raw_data()
- jpeg_skip_scanlines() and jpeg_crop_scanline()
(This is subtle, but both of those functions use JSAMPLE-dependent
opaque structures behind the scenes.)
It is much more readable and maintainable to provide 12-bit-specific
versions of those six top-level API functions and to document that the
aforementioned methods and fields must be type-cast when using 12-bit
samples. Since that eliminates the need to provide a 12-bit-specific
version of the exposed libjpeg API structures, we can:
- Compile only the precision-dependent libjpeg modules (the
coefficient buffer controllers, the colorspace converters, the
DCT/IDCT managers, the main buffer controllers, the preprocessing
and postprocessing controller, the downsampler and upsamplers, the
quantizers, the integer DCT methods, and the IDCT methods) for
multiple data precisions.
- Introduce 12-bit-specific methods into the various internal
structures defined in jpegint.h.
- Create precision-independent data type, macro, method, field, and
function names that are prefixed by an underscore, and use an
internal header to convert those into precision-dependent data
type, macro, method, field, and function names, based on the value
of BITS_IN_JSAMPLE, when compiling the precision-dependent libjpeg
modules.
- Expose precision-dependent jinit*() functions for each of the
precision-dependent libjpeg modules.
- Abstract the precision-dependent libjpeg modules by calling the
appropriate precision-dependent jinit*() function, based on the
value of cinfo->data_precision, from top-level libjpeg API
functions.
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ec6e451d
|
2022-10-21T16:45:25
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Lossless JPEG support: Add copyright attributions
Referring to
https://github.com/libjpeg-turbo/libjpeg-turbo/issues/402#issuecomment-768348440
and
https://github.com/libjpeg-turbo/libjpeg-turbo/issues/402#issuecomment-770221584
Ken Murchison clarified that it was his intent to release the lossless
JPEG patch under the IJG License and that adding his name to the
copyright headers would be sufficient to acknowledge that any
derivatives are based on his work.
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2e8360e0
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1999-04-27T00:00:00
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IJG's JPEG software v6b with lossless JPEG support
Patch obtained from:
https://sourceforge.net/projects/jpeg/files/ftp.oceana.com
Author date taken from original announcement and timestamp of patch
tarball:
https://groups.google.com/g/comp.protocols.dicom/c/rrkP8BxoMRk/m/Ij4dfprggp8J
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5acd9f20
|
2022-10-04T12:58:11
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Merge branch 'main' into dev
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eb0a024a
|
2022-10-04T12:51:38
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Remove redundant jconfigint.h #includes
Because of 607b668ff96e40fdc749de9b1bb98e7f40c86d93, jconfigint.h is
included by jinclude.h.
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7fec5074
|
2022-03-08T12:34:11
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Support 8-bit & 12-bit JPEGs using the same build
Partially implements #199
This commit also implements a request from #178 (the ability to compile
the libjpeg example as a standalone program.)
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13377e6b
|
2022-02-11T13:58:31
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MSVC: Eliminate int conversion warnings (C4244)
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17297239
|
2022-01-06T09:17:30
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|
Eliminate non-ANSI C compatibility macros
libjpeg-turbo has never supported non-ANSI C compilers. Per the spec,
ANSI C compilers must have locale.h, stddef.h, stdlib.h, memset(),
memcpy(), unsigned char, and unsigned short. They must also handle
undefined structures.
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a72816ed
|
2021-07-16T09:37:06
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Use uintptr_t, if avail, for pointer-to-int casts
Although sizeof(void *) == sizeof(size_t) for all architectures that are
currently supported by libjpeg-turbo, such is not guaranteed by the C
standard. Specifically, CHERI-enabled architectures (e.g. CHERI-RISC-V
or Arm's Morello) use capability pointers that are twice the size of
size_t (128 bits for Morello and RV64), so casting to size_t strips the
upper bits of the pointer (including the validity bit) and makes it
non-deferenceable, as indicated by the following compiler warning:
warning: cast from provenance-free integer type to pointer type will
give pointer that can not be dereferenced
[-Werror,-Wcheri-capability-misuse]
cvalue = values = (JCOEF *)PAD((size_t)values_unaligned, 16);
Ignoring this warning results in a run-time crash. Casting pointers to
uintptr_t, if it is available, avoids this problem, since uintptr_t is
defined as an unsigned integer type that can hold a pointer value.
Since C89 compatibility is still necessary in libjpeg-turbo, this commit
introduces a new typedef for pointer-to-integer casts that uses a
GNU-specific extension available in GCC 4.6+ and Clang 3.0+ and falls
back to using size_t if the extension is unavailable. The only other
options would require C99 or Clang-specific builtins.
Closes #538
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3932190c
|
2021-05-17T13:05:16
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Fix build w/ non-GCC-compatible Un*x/Arm compilers
Regression introduced by d2c407995992be1f128704ae2479adfd7906c158
Closes #519
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df17d398
|
2021-04-06T11:34:30
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jcphuff.c: -Wjump-misses-init warning w/GCC 9 -m32
(verified that this commit does not change the generated 64-bit or
32-bit assembly code)
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d2c40799
|
2020-12-17T16:02:47
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Use CLZ compiler intrinsic for Windows/Arm builds
The __builtin_clz() compiler intrinsic was already used in the C Huffman
encoders when building libjpeg-turbo for Arm CPUs using a GCC-compatible
compiler. This commit modifies the C Huffman encoders so that they also
use__builtin_clz() when building for Arm CPUs using Visual Studio +
Clang, as well as the equivalent _CountLeadingZeros() compiler intrinsic
when building for Arm CPUs using Visual C++.
In addition to making the C Huffman encoders faster on Windows/Arm, this
also prevents jpeg_nbits_table from being included in Windows/Arm builds,
thus saving 128 KB of memory.
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4b838c38
|
2021-01-11T13:45:25
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jcphuff.c: Fix compiler warning with clang-cl
Fixes #492
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1ed312ea
|
2020-10-15T17:47:31
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"ARM"="Arm", "NEON"="Neon"
Refer to:
https://www.arm.com/company/policies/trademarks/arm-trademark-list/arm-trademark
https://www.arm.com/company/policies/trademarks/arm-trademark-list/neon-trademark
NOTE: These changes are only applied to change log entries for 2.0.x and
later, since the change log is a historical record and Arm's new
trademark policy did not go into effect until late 2017.
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74aeaddf
|
2019-10-16T21:16:43
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jc*huff.c: Consistify preproc directive formatting
The rest of the libjpeg API code uses "#if defined(condition)" rather
than "#if defined condition".
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3fa69b4d
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2018-03-23T10:41:07
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jcphuff.c: Fix compiler warning
Misleading indentation, introduced by
5b177b3cab5cfb661256c1e74df160158ec6c34e
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8adf4c0a
|
2018-03-22T17:14:15
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jcphuff.c: Fix compiler warning with Visual C++
GCC doesn't seem to care if we pass no arguments to the ENCODE_COEFS*
macros, but MSVC does. Insert a no-op to make it happy.
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5b177b3c
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2018-03-22T11:36:43
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C/SSE2 optimization of encode_mcu_AC_first()
This commit adds C and SSE2 optimizations for the encode_mcu_AC_first()
function used in progressive Huffman encoding.
The image used for testing can be retrieved from this page:
https://blog.cloudflare.com/doubling-the-speed-of-jpegtran
All timings done on `Intel(R) Core(TM) i7-4870HQ CPU @ 2.50GHz`
clang version is `Apple LLVM version 9.0.0 (clang-900.0.39.2)`
gcc-5 version is `gcc-5 (Homebrew GCC 5.5.0) 5.5.0`
gcc-7 version is `gcc-7 (Homebrew GCC 7.2.0) 7.2.0`
Here are the results in comparison to libjpeg-turbo@293263c using
`time ./jpegtran -outfile /dev/null -progressive -optimise -copy none print_poster_0025.jpg`
C
clang x86_64: +19%
gcc-5 x86_64: +80%
gcc-7 x86_64: +57%
clang i386: +5%
gcc-5 i386: +59%
gcc-7 i386: +51%
SSE2
clang x86_64: +79%
gcc-5 x86_64: +158%
gcc-7 x86_64: +122%
clang i386: +71%
gcc-5 i386: +134%
gcc-7 i386: +135%
Discussion in libjpeg-turbo/libjpeg-turbo#46
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16bd9845
|
2018-03-02T22:33:19
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C/SSE2 optimization of encode_mcu_AC_refine()
This commit adds C and SSE2 optimizations for the encode_mcu_AC_refine()
function used in progressive Huffman encoding.
The image used for testing can be retrieved from this page:
https://blog.cloudflare.com/doubling-the-speed-of-jpegtran
All timings done on `Intel(R) Core(TM) i7-4870HQ CPU @ 2.50GHz`
clang version is `Apple LLVM version 9.0.0 (clang-900.0.39.2)`
gcc-5 version is `gcc-5 (Homebrew GCC 5.5.0) 5.5.0`
gcc-7 version is `gcc-7 (Homebrew GCC 7.2.0) 7.2.0`
Here are the results in comparison to libjpeg-turbo@3c54642 using
`time ./jpegtran -outfile /dev/null -progressive -optimise -copy none print_poster_0025.jpg`
C
clang x86_64: +7%
gcc-5 x86_64: +30%
gcc-7 x86_64: +33%
clang i386: +0%
gcc-5 i386: +24%
gcc-7 i386: +23%
SSE2
clang x86_64: +42%
gcc-5 x86_64: +53%
gcc-7 x86_64: +64%
clang i386: +35%
gcc-5 i386: +46%
gcc-7 i386: +49%
Discussion in libjpeg-turbo/libjpeg-turbo#46
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293263c3
|
2018-03-17T15:14:35
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|
Format preprocessor macros more consistently
Within the libjpeg API code, it seems to be more the convention than not
to separate the macro name and value by two or more spaces, which
improves general readability. Making this consistent across all of
libjpeg-turbo is less about my individual preferences and more about
making it easy to automatically detect variations from our chosen
formatting convention. I intend to release the script I'm using to
validate this stuff, once it matures and stabilizes a bit.
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19c791cd
|
2018-03-08T10:55:20
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Improve code formatting consistency
With rare exceptions ...
- Always separate line continuation characters by one space from
preceding code.
- Always use two-space indentation. Never use tabs.
- Always use K&R-style conditional blocks.
- Always surround operators with spaces, except in raw assembly code.
- Always put a space after, but not before, a comma.
- Never put a space between type casts and variables/function calls.
- Never put a space between the function name and the argument list in
function declarations and prototypes.
- Always surround braces ('{' and '}') with spaces.
- Always surround statements (if, for, else, catch, while, do, switch)
with spaces.
- Always attach pointer symbols ('*' and '**') to the variable or
function name.
- Always precede pointer symbols ('*' and '**') by a space in type
casts.
- Use the MIN() macro from jpegint.h within the libjpeg and TurboJPEG
API libraries (using min() from tjutil.h is still necessary for
TJBench.)
- Where it makes sense (particularly in the TurboJPEG code), put a blank
line after variable declaration blocks.
- Always separate statements in one-liners by two spaces.
The purpose of this was to ease maintenance on my part and also to make
it easier for contributors to figure out how to format patch
submissions. This was admittedly confusing (even to me sometimes) when
we had 3 or 4 different style conventions in the same source tree. The
new convention is more consistent with the formatting of other OSS code
bases.
This commit corrects deviations from the chosen formatting style in the
libjpeg API code and reformats the TurboJPEG API code such that it
conforms to the same standard.
NOTES:
- Although it is no longer necessary for the function name in function
declarations to begin in Column 1 (this was historically necessary
because of the ansi2knr utility, which allowed libjpeg to be built
with non-ANSI compilers), we retain that formatting for the libjpeg
code because it improves readability when using libjpeg's function
attribute macros (GLOBAL(), etc.)
- This reformatting project was accomplished with the help of AStyle and
Uncrustify, although neither was completely up to the task, and thus
a great deal of manual tweaking was required. Note to developers of
code formatting utilities: the libjpeg-turbo code base is an
excellent test bed, because AFAICT, it breaks every single one of the
utilities that are currently available.
- The legacy (MMX, SSE, 3DNow!) assembly code for i386 has been
formatted to match the SSE2 code (refer to
ff5685d5344273df321eb63a005eaae19d2496e3.) I hadn't intended to
bother with this, but the Loongson MMI implementation demonstrated
that there is still academic value to the MMX implementation, as an
algorithmic model for other 64-bit vector implementations. Thus, it
is desirable to improve its readability in the same manner as that of
the SSE2 implementation.
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37bae1a0
|
2018-02-14T17:22:00
|
|
Prog Huff enc: bit count/branchless abs val opts
Ported from baseline Huffman encoder. This improves overall compression
performance by ~3-9% in my testing.
|
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bd49803f
|
2016-02-19T08:53:33
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|
Use consistent/modern code formatting for pointers
The convention used by libjpeg:
type * variable;
is not very common anymore, because it looks too much like
multiplication. Some (particularly C++ programmers) prefer to tuck the
pointer symbol against the type:
type* variable;
to emphasize that a pointer to a type is effectively a new type.
However, this can also be confusing, since defining multiple variables
on the same line would not work properly:
type* variable1, variable2; /* Only variable1 is actually a
pointer. */
This commit reformats the entirety of the libjpeg-turbo code base so
that it uses the same code formatting convention for pointers that the
TurboJPEG API code uses:
type *variable1, *variable2;
This seems to be the most common convention among C programmers, and
it is the convention used by other codec libraries, such as libpng and
libtiff.
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|
aa769feb
|
2015-10-15T02:25:00
|
|
Fix compiler warnings under Visual C++
A few of these are long-standing, but most were exposed when switching
from INT32 to JLONG.
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d65e768b
|
2015-10-14T22:26:25
|
|
Fix additional issues reported by UB sanitizers
Most of these involved overrunning the signed 32-bit JLONG type whenever
building libjpeg-turbo with a 32-bit compiler. These issues are not
believed to represent actual security threats, but eliminating them
makes it easier to detect such threats should they arise in the future.
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1e32fe31
|
2015-10-14T17:32:39
|
|
Replace INT32 with a new internal datatype (JLONG)
These days, INT32 is a commonly-defined datatype in system headers. We
cannot eliminate the definition of that datatype from jmorecfg.h, since
the INT32 typedef has technically been part of the libjpeg API since
version 5 (1994.) However, using INT32 internally is risky, because the
inclusion of a particular header (Xmd.h, for instance) could change the
definition of INT32 from long to int on 64-bit platforms and thus change
the internal behavior of libjpeg-turbo in unexpected ways (for instance,
failing to correctly set __INT32_IS_ACTUALLY_LONG to match the INT32
typedef-- perhaps as a result of including the wrong version of
jpeglib.h-- could cause libjpeg-turbo to produce incorrect results.)
The library has always been built in environments in which INT32 is
effectively long (on Windows, long is always 32-bit, so effectively it's
the same as int), so it makes sense to turn INT32 into an explicitly
long datatype. This ensures that libjpeg-turbo will always behave
consistently, regardless of the headers included at compile time.
Addresses a concern expressed in #26.
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7e3acc0e
|
2015-10-10T10:25:46
|
|
Rename README, LICENSE, BUILDING text files
The IJG README file has been renamed to README.ijg, in order to avoid
confusion (many people were assuming that that was our project's README
file and weren't reading README-turbo.txt) and to lay the groundwork for
markdown versions of the libjpeg-turbo README and build instructions.
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489583f5
|
1996-02-07T00:00:00
|
|
The Independent JPEG Group's JPEG software v6a
|
|
|
bc79e068
|
1995-08-02T00:00:00
|
|
The Independent JPEG Group's JPEG software v6
|
|
5996a25e
|
2009-06-27T00:00:00
|
|
The Independent JPEG Group's JPEG software v7
|
|
|
5ead57a3
|
1998-03-27T00:00:00
|
|
The Independent JPEG Group's JPEG software v6b
|
|
5de454b2
|
2014-05-18T19:04:03
|
|
libjpeg-turbo has never supported non-ANSI compilers, so get rid of the crufty SIZEOF() macro. It was not being used consistently anyhow, so it would not have been possible to build prior releases of libjpeg-turbo using the broken compilers for which that macro was designed.
git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/trunk@1313 632fc199-4ca6-4c93-a231-07263d6284db
|
|
|
5033f3e1
|
2014-05-18T18:33:44
|
|
Remove MS-DOS code and information, and adjust copyright headers to reflect the removal of features in r1307 and r1308. libjpeg-turbo has never supported MS-DOS, nor is it even possible for us to do so.
git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/trunk@1312 632fc199-4ca6-4c93-a231-07263d6284db
|
|
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bc56b754
|
2014-05-16T10:43:44
|
|
Get rid of the HAVE_PROTOTYPES configuration option, as well as the related JMETHOD and JPP macros. libjpeg-turbo has never supported compilers that don't handle prototypes. Doing so requires ansi2knr, which isn't even supported in the IJG code anymore.
git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/trunk@1308 632fc199-4ca6-4c93-a231-07263d6284db
|
|
|
b7753510
|
2014-05-11T09:36:25
|
|
Convert tabs to spaces in the libjpeg code and the SIMD code (TurboJPEG retains the use of tabs for historical reasons. They were annoying in the libjpeg code primarily because they were not consistently used and because they were used to format as well as indent the code. In the case of TurboJPEG, tabs are used just to indent the code, so even if the editor assumes a different tab width, the code will still be readable.)
git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/branches/1.3.x@1285 632fc199-4ca6-4c93-a231-07263d6284db
|
|
|
e5eaf374
|
2014-05-09T18:00:32
|
|
Convert tabs to spaces in the libjpeg code and the SIMD code (TurboJPEG retains the use of tabs for historical reasons. They were annoying in the libjpeg code primarily because they were not consistently used and because they were used to format as well as indent the code. In the case of TurboJPEG, tabs are used just to indent the code, so even if the editor assumes a different tab width, the code will still be readable.)
git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/trunk@1278 632fc199-4ca6-4c93-a231-07263d6284db
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b28e287f
|
2009-03-13T12:16:51
|
|
Don't mix LOCAL() and qualifiers.
git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/trunk@25 632fc199-4ca6-4c93-a231-07263d6284db
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0ca44258
|
2008-09-28T05:08:48
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Merged changes from branches/1.5-xserver (revision range 2432:2631) back to trunk.
git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/trunk@2 632fc199-4ca6-4c93-a231-07263d6284db
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