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be96fa0a
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2023-12-14T13:18:20
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Doc: Lossless JPEG clarifications
- Clarify that lossless JPEG is slower than and doesn't compress as well
as lossy JPEG. (That should be obvious, because "lossy" literally
means that data is thrown away.)
- Re-generate TurboJPEG C API documentation using Doxygen 1.9.8.
- Clarify that setting the data_precision field in jpeg_compress_struct
to 16 requires lossless mode.
- Explain what the predictor selection value actually does. (Refer to
Recommendation ITU-T T.81 (1992) | ISO/IEC 10918-1:1994, Section
H.1.2.1.)
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df9dbff8
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2023-11-11T12:25:03
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TurboJPEG: New param to limit virt array mem usage
This corresponds to max_memory_to_use in the jpeg_memory_mgr struct in
the libjpeg API, except that the TurboJPEG parameter is specified in
megabytes. Because this is 2023 and computers with less than 1 MB of
memory are not a thing (at least not within the scope of libjpeg-turbo
support), it isn't useful to allow a limit less than 1 MB to be
specified. Furthermore, because TurboJPEG parameters are signed
integers, if we allowed the memory limit to be specified in bytes, then
it would be impossible to specify a limit larger than 2 GB on 64-bit
machines. Because max_memory_to_use is a long signed integer,
effectively we can specify a limit of up to 2 petabytes on 64-bit
machines if the TurboJPEG parameter is specified in megabytes. (2 PB
should be enough for anybody, right?)
This commit also bumps the TurboJPEG API version to 3.0.1. Since the
TurboJPEG API version no longer tracks the libjpeg-turbo version, it
makes sense to increment the API revision number when adding constants,
to increment the minor version number when adding functions, and to
increment the major version number for a complete overhaul.
This commit also removes the vestigial TJ_NUMPARAM macro, which was
never defined because it proved unnecessary.
Partially implements #735
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fc01f467
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2023-01-05T06:36:46
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TurboJPEG 3 API overhaul
(ChangeLog update forthcoming)
- Prefix all function names with "tj3" and remove version suffixes from
function names. (Future API overhauls will increment the prefix to
"tj4", etc., thus retaining backward API/ABI compatibility without
versioning each individual function.)
- Replace stateless boolean flags (including TJ*FLAG_ARITHMETIC and
TJ*FLAG_LOSSLESS, which were never released) with stateful integer
parameters, the value of which persists between function calls.
* Use parameters for the JPEG quality and subsampling as well, in
order to eliminate the awkwardness of specifying function arguments
that weren't relevant for lossless compression.
* tj3DecompressHeader() now stores all relevant information about the
JPEG image, including the width, height, subsampling type, entropy
coding type, etc. in parameters rather than returning that
information in its arguments.
* TJ*FLAG_LIMITSCANS has been reimplemented as an integer parameter
(TJ*PARAM_SCANLIMIT) that allows the number of scans to be
specified.
- Use the const keyword for all pointer arguments to unmodified
buffers, as well as for both dimensions of 2D pointers. Addresses
#395.
- Use size_t rather than unsigned long to represent buffer sizes, since
unsigned long is a 32-bit type on Windows. Addresses #24.
- Return 0 from all buffer size functions if an error occurs, rather
than awkwardly trying to return -1 in an unsigned data type.
- Implement 12-bit and 16-bit data precision using dedicated
compression, decompression, and image I/O functions/methods.
* Suffix the names of all data-precision-specific functions with 8,
12, or 16.
* Because the YUV functions are intended to be used for video, they
are currently only implemented with 8-bit data precision, but they
can be expanded to 12-bit data precision in the future, if
necessary.
* Extend TJUnitTest and TJBench to test 12-bit and 16-bit data
precision, using a new -precision option.
* Add appropriate regression tests for all of the above to the 'test'
target.
* Extend tjbenchtest to test 12-bit and 16-bit data precision, and
add separate 'tjtest12' and 'tjtest16' targets.
* BufferedImage I/O in the Java API is currently limited to 8-bit
data precision, since the BufferedImage class does not
straightforwardly support higher data precisions.
* Extend the PPM reader to convert 12-bit and 16-bit PBMPLUS files
to grayscale or CMYK pixels, as it already does for 8-bit files.
- Properly accommodate lossless JPEG using dedicated parameters
(TJ*PARAM_LOSSLESS, TJ*PARAM_LOSSLESSPSV, and TJ*PARAM_LOSSLESSPT),
rather than using a flag and awkwardly repurposing the JPEG quality.
Update TJBench to properly reflect whether a JPEG image is lossless.
- Re-organize the TJBench usage screen.
- Update the Java docs using Java 11, to improve the formatting and
eliminate HTML frames.
- Use the accurate integer DCT algorithm by default for both
compression and decompression, since the "fast" algorithm is a legacy
feature, it does not pass the ISO compliance tests, and it is not
actually faster on modern x86 CPUs.
* Remove the -accuratedct option from TJBench and TJExample.
- Re-implement the 'tjtest' target using a CMake script that enables
the appropriate tests, depending on the data precision and whether or
not the Java API is part of the build.
- Consolidate the C and Java versions of tjbenchtest into one script.
- Consolidate the C and Java versions of tjexampletest into one script.
- Combine all initialization functions into a single function
(tj3Init()) that accepts an integer parameter specifying the
subsystems to initialize.
- Enable decompression scaling explicitly, using a new function/method
(tj3SetScalingFactor()/TJDecompressor.setScalingFactor()), rather
than implicitly using awkward "desired width"/"desired height"
parameters.
- Introduce a new macro/constant (TJUNSCALED/TJ.UNSCALED) that maps to
a scaling factor of 1/1.
- Implement partial image decompression, using a new function/method
(tj3SetCroppingRegion()/TJDecompressor.setCroppingRegion()) and
TJBench option (-crop). Extend tjbenchtest to test the new feature.
Addresses #1.
- Allow the JPEG colorspace to be specified explicitly when
compressing, using a new parameter (TJ*PARAM_COLORSPACE). This
allows JPEG images with the RGB and CMYK colorspaces to be created.
- Remove the error/difference image feature from TJBench. Identical
images to the ones that TJBench created can be generated using
ImageMagick with
'magick composite <original_image> <output_image> -compose difference <diff_image>'
- Handle JPEG images with unknown subsampling types. TJ*PARAM_SUBSAMP
is set to TJ*SAMP_UNKNOWN (== -1) for such images, but they can still
be decompressed fully into packed-pixel images or losslessly
transformed (with the exception of lossless cropping.) They cannot
be partially decompressed or decompressed into planar YUV images.
Note also that TJBench, due to its lack of support for imperfect
transforms, requires that the subsampling type be known when
rotating, flipping, or transversely transposing an image. Addresses
#436
- The Java version of TJBench now has identical functionality to the C
version. This was accomplished by (somewhat hackishly) calling the
TurboJPEG C image I/O functions through JNI and copying the pixels
between the C heap and the Java heap.
- Add parameters (TJ*PARAM_RESTARTROWS and TJ*PARAM_RESTARTBLOCKS) and
a TJBench option (-restart) to allow the restart marker interval to
be specified when compressing. Eliminate the undocumented TJ_RESTART
environment variable.
- Add a parameter (TJ*PARAM_OPTIMIZE), a transform option
(TJ*OPT_OPTIMIZE), and a TJBench option (-optimize) to allow
optimized baseline Huffman coding to be specified when compressing.
Eliminate the undocumented TJ_OPTIMIZE environment variable.
- Add parameters (TJ*PARAM_XDENSITY, TJ*PARAM_DENSITY, and
TJ*DENSITYUNITS) to allow the pixel density to be specified when
compressing or saving a Windows BMP image and to be queried when
decompressing or loading a Windows BMP image. Addresses #77.
- Refactor the fuzz targets to use the new API.
* Extend decompression coverage to 12-bit and 16-bit data precision.
* Replace the awkward cjpeg12 and cjpeg16 targets with proper
TurboJPEG-based compress12, compress12-lossless, and
compress16-lossless targets
- Fix innocuous UBSan warnings uncovered by the new fuzzers.
- Implement previous versions of the TurboJPEG API by wrapping the new
functions (tested by running the 2.1.x versions of TJBench, via
tjbenchtest, and TJUnitTest against the new implementation.)
* Remove all JNI functions for deprecated Java methods and implement
the deprecated methods using pure Java wrappers. It should be
understood that backward API compatibility in Java applies only to
the Java classes and that one cannot mix and match a JAR file from
one version of libjpeg-turbo with a JNI library from another
version.
- tj3Destroy() now silently accepts a NULL handle.
- tj3Alloc() and tj3Free() now return/accept void pointers, as malloc()
and free() do.
- The image I/O functions now accept a TurboJPEG instance handle, which
is used to transmit/receive parameters and to receive error
information.
Closes #517
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98ff1fd1
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2022-11-21T20:57:39
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TurboJPEG: Add lossless JPEG detection capability
Add a new TurboJPEG C API function (tjDecompressHeader4()) and Java API
method (TJDecompressor.getFlags()) that return the bitwise OR of any
flags that are relevant to the JPEG image being decompressed (currently
TJFLAG_PROGRESSIVE, TJFLAG_ARITHMETIC, TJFLAG_LOSSLESS, and their Java
equivalents.) This allows a calling program to determine whether the
image being decompressed is a lossless JPEG image, which means that the
decompression scaling feature will not be available and that a
full-sized destination buffer should be allocated.
More specifically, this fixes a buffer overrun in TJBench, TJExample,
and the decompress* fuzz targets that occurred when attempting (in vain)
to decompress a lossless JPEG image with decompression scaling enabled.
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ba22c0f7
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2022-06-24T14:03:03
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tjDecompressHeader3(): Accept tables-only streams
Inspired by:
https://github.com/amyspark/libjpeg-turbo/commit/b3b15cfe74cf07914122e26cf1e408a9a9cf3135
Closes #604
Closes #605
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cd9a3185
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2021-04-05T22:20:52
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Bump TurboJPEG C API version to 2.1
(because of TJFLAG_LIMITSCANS)
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2d14fc2e
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2020-10-01T14:35:46
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Dox: Re-generate using Doxygen 1.8.20
This fixes a GitHub Dependabot alert regarding jquery.js.
Fixes #421
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c0ca354e
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2018-03-22T16:04:29
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Label this release 2.0 instead of 1.6
This also pulls the formatting changes from
19c791cdac6df84418c66eb9d67cfa9703bc2461 into the TurboJPEG C API docs.
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b9ab64d8
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2017-05-11T21:02:29
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TurboJPEG: Thread-safe error message retrieval
Introduce a new C API function (tjGetErrorStr2()) that can be used to
retrieve compression/decompression/transform error messages in a
thread-safe (i.e. instance-specific) manner. Retrieving error messages
from global functions is still thread-unsafe.
Addresses a concern expressed in #151.
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7c202f76
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2016-02-29T13:18:01
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Bump TurboJPEG C API revision to 1.5
The changes relative to 1.4.x are only cosmetic (using const pointers)
and should not affect API/ABI compatibility, but our practice is to
synchronize the API revision with the most recent release that provides
user-visible changes to the API.
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c71ab2f7
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2014-08-10T16:43:31
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Make the documentation more readable by displaying fixed-width text (which is used to refer to variables and functions) in a different color.
git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/trunk@1339 632fc199-4ca6-4c93-a231-07263d6284db
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983503ed
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2014-08-10T16:39:32
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Fix a display issue in the documentation for tjDecompress2() (doxygen treats a star at the beginning of the line as a list bullet); make the documentation more readable by displaying fixed-width text (which is used to refer to variables and functions) in a different color.
git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/branches/1.3.x@1338 632fc199-4ca6-4c93-a231-07263d6284db
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7bd24b26
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2013-08-18T09:38:52
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Disable timestamp in generated HTML files to make diffing and merging easier.
git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/trunk@1013 632fc199-4ca6-4c93-a231-07263d6284db
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ca866c48
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2013-08-18T09:37:48
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Disable timestamp in generated HTML files to make diffing and merging easier.
git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/branches/1.3.x@1012 632fc199-4ca6-4c93-a231-07263d6284db
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3b21982b
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2013-08-18T09:31:45
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Wordsmithing
git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/trunk@1011 632fc199-4ca6-4c93-a231-07263d6284db
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7657726d
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2013-08-18T09:28:09
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Wordsmithing
git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/branches/1.3.x@1010 632fc199-4ca6-4c93-a231-07263d6284db
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d081fd72
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2013-08-18T09:15:37
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Add note regarding the fact that 4:4:0 lacks full SIMD support; Add an option for benchmarking 4:4:0 subsampling in tjbench.
git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/trunk@1009 632fc199-4ca6-4c93-a231-07263d6284db
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bcda6834
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2013-08-18T09:02:42
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Upgrade to Doxygen 1.8.3.1; Add note regarding the fact that 4:4:0 lacks full SIMD support.
git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/branches/1.3.x@1007 632fc199-4ca6-4c93-a231-07263d6284db
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a4a48ed0
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2013-08-18T08:47:03
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Upgrade to Doxygen 1.8.3.1
git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/trunk@1005 632fc199-4ca6-4c93-a231-07263d6284db
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f610d61f
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2013-04-26T10:33:29
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Extend the TurboJPEG C API to support generating YUV images with arbitrary padding and to support image scaling when decompressing to YUV
git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/trunk@962 632fc199-4ca6-4c93-a231-07263d6284db
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d8522a75
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2013-04-26T08:54:10
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Wordsmithing
git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/branches/1.3.x@961 632fc199-4ca6-4c93-a231-07263d6284db
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01fdcc39
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2013-04-26T08:41:25
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Further doc tweaks
git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/branches/1.3.x@959 632fc199-4ca6-4c93-a231-07263d6284db
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9ce1a21e
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2013-04-26T05:32:32
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Subtle point, but since libjpeg-turbo 1.3 now supports scaling factors > 1, the width and height specified in tjDecompress2() are not necessarily smaller than the JPEG width/height.
git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/branches/1.3.x@957 632fc199-4ca6-4c93-a231-07263d6284db
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73d74c13
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2012-06-29T23:46:38
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Add flags to the TurboJPEG API that allow the caller to force the use of either the fast or the accurate DCT/IDCT algorithms in the underlying codec.
git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/trunk@851 632fc199-4ca6-4c93-a231-07263d6284db
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e0a01517
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2012-06-29T23:17:03
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Re-generate docs to pick up new API version
git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/branches/1.2.x@850 632fc199-4ca6-4c93-a231-07263d6284db
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fd3aba35
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2012-06-29T23:14:48
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Added flags to the TurboJPEG API that allow the caller to force the use of either the fast or the accurate DCT/IDCT algorithms in the underlying codec.
git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/branches/1.2.x@849 632fc199-4ca6-4c93-a231-07263d6284db
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67ce3b23
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2011-12-19T02:21:03
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Added new alpha channel colorspace constants/pixel formats, so applications can specify that they need the unused byte in a 4-component RGB output buffer set to 0xFF when decompressing.
git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/trunk@732 632fc199-4ca6-4c93-a231-07263d6284db
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80803ae5
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2011-12-15T13:12:59
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"which"="that"
git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/trunk@730 632fc199-4ca6-4c93-a231-07263d6284db
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f69dc288
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2011-09-20T18:20:43
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Wordsmithing
git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/trunk@711 632fc199-4ca6-4c93-a231-07263d6284db
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870fd8f1
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2011-09-20T05:04:06
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Add a couple of missing pages
git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/trunk@708 632fc199-4ca6-4c93-a231-07263d6284db
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f5467110
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2011-09-20T05:02:19
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Implement custom filter callback in Java
git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/trunk@707 632fc199-4ca6-4c93-a231-07263d6284db
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7bf04d39
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2011-09-17T00:18:31
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Implement a custom DCT filter callback for lossless transforms
git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/trunk@703 632fc199-4ca6-4c93-a231-07263d6284db
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9b49f0e4
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2011-07-12T03:17:23
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Re-work TJBUFSIZE() to take into account the level of chrominance subsampling
git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/trunk@668 632fc199-4ca6-4c93-a231-07263d6284db
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d4411070
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2011-05-24T17:00:15
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Added "See also" for tjAlloc() and tjFree()
git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/trunk@635 632fc199-4ca6-4c93-a231-07263d6284db
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6b76f75d
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2011-05-24T16:52:47
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Add new API functions, tjAlloc() and tjFree(), which allow memory to be allocated and freed using a method of the library's choosing. At the moment, the primary purpose for this is to avoid allocating/freeing memory across the DLL boundary on Windows.
git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/trunk@634 632fc199-4ca6-4c93-a231-07263d6284db
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ff78e375
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2011-05-24T10:17:32
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Don't require buffer size to be preset if using TJFLAG_NOREALLOC
git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/trunk@626 632fc199-4ca6-4c93-a231-07263d6284db
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25b995ad
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2011-05-21T15:34:54
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Clean up constants so that flags, pixel formats, etc. are clearly differentiated; Update documentation accordingly; Name the enums to make it easier to reference them in the docs and clean up the references accordingly; Set Doxygen option to force a detailed description for the constants to always be generated
git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/trunk@617 632fc199-4ca6-4c93-a231-07263d6284db
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9b28defe
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2011-05-21T14:37:15
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Completely refactored the TurboJPEG C API so that it uses pixel formats instead of the clunky pixel size + flags combination to define the pixel size and component order. tjCompress2() and tjTransform() can also now grow the JPEG buffer as needed, which can allow programs to save memory by not pre-allocating the "worst-case" buffer size calculated by TJBUFSIZE(). Converted API documentation to Doxygen. There is no legacy code remaining, so the refactored version of the library has been re-licensed under a BSD-style license.
git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/trunk@616 632fc199-4ca6-4c93-a231-07263d6284db
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