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80acd5c4
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2019-12-19T10:20:52
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Remove code for the obsolete RLE image format
libjpeg-turbo never included that code, because it requires an external
library (the Utah Raster Toolkit.) The RLE image format was supplanted
by GIF in the late 1980s, so it is rarely seen these days. (It had a
lousy Weissman score, anyhow.)
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e98b0612
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2019-12-18T15:12:33
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Add fault tolerance features to djpeg and jpegtran
- Enable progress reporting at run time using a new -report argument
(cjpeg now supports that argument as well)
- Limit the allowable number of scans using a new -maxscans argument
- Treat warnings as fatal using a new -strict argument
This mainly demonstrates how to work around the two issues with the
JPEG standard described here:
https://libjpeg-turbo.org/pmwiki/uploads/About/TwoIssueswiththeJPEGStandard.pdf
since those and similar issues continue to be erroneously reported as
libjpeg-turbo bugs.
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4893e5d8
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2017-11-17T19:00:53
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Merge branch 'master' into dev
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5bc43c78
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2017-11-13T21:01:53
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Further partial image decompression fixes
- Referring to 073b0e88a192adebbb479ee2456beb089d8b5de7 and #185, the
reason why BMP and RLE didn't (and won't) work with partial image
decompression is that the output engines for both formats maintain a
whole-image buffer, which is used to reverse the order of scanlines.
However, it was straightforward to add -crop support for GIF and
Targa, which is useful for testing partial image decompression along
with color quantization.
- Such testing reproduced a bug reported by Mozilla (refer to PR #182)
whereby jpeg_skip_scanlines() would segfault if color quantization was
enabled. To fix this issue, read_and_discard_scanlines() now sets up
a dummy quantize function in the same manner that it sets up a dummy
color conversion function.
Closes #182
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073b0e88
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2017-11-08T21:01:57
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djpeg -crop: Exit gracefully with non-PPM formats
... and document that only PPM/PGM output images are supported with the
-crop option for the moment.
I investigated the possibility of supporting -crop with -bmp, but even
after resetting the buffer dimensions, I still kept getting virtual
array access errors. It seems that doing this the "right way" would
require creating a re-initialization function for each image format's
destination manager. I'm disinclined to do that right now, given that
this feature was Google's baby (developed as a prerequisite for
including libjpeg-turbo in Android), and the -crop option in djpeg is
intended only as an example of how to use the partial image
decompression API. Real-world applications would need to handle this
in their own destination managers.
It would probably be possible to make this work with Targa by employing
a similar hack to the one we used with PPM, but Targa isn't popular
enough to bother.
Fixes #185
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2ac4e9d9
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2017-06-26T21:58:32
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Merge branch 'master' into dev
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da2a27ef
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2017-03-18T16:15:14
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Honor max_memory_to_use/JPEGMEM/-maxmemory
This re-introduces a feature of the obsolete system-specific libjpeg
memory managers-- namely the ability to limit the amount of main memory
used by the library during decompression or multi-pass compression.
This is mainly beneficial for two reasons:
- Works around a 2 GB limit in libFuzzer
- Allows security-sensitive applications to set a memory limit for the
JPEG decoder so as to work around the progressive JPEG exploit
(LJT-01-004) described here:
http://www.libjpeg-turbo.org/pmwiki/uploads/About/TwoIssueswiththeJPEGStandard.pdf
This commit also removes obsolete documentation regarding the MS-DOS
memory manager (which itself was removed long ago) and changes the
documentation of the -maxmemory switch and JPEGMEM environment variable
to reflect the fact that backing stores are never used in libjpeg-turbo.
Inspired by:
https://github.com/caolanm/libjpeg-turbo/commit/066fee2e7d6834f24838bc1896aa38ca77209e3c
Closes #143
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44b2399a
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2017-01-19T15:18:57
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libjpeg API: Support reading/writing ICC profiles
This commit does the following:
-- Merges the two glueware functions (read_icc_profile() and
write_icc_profile()) from iccjpeg.c, which is contained in downstream
projects such as LCMS, Ghostscript, Mozilla, etc. These functions were
originally intended for inclusion in libjpeg, but Tom Lane left the IJG
before that could be accomplished. Since then, programs and libraries
that needed to embed/extract ICC profiles in JPEG files had to include
their own local copy of iccjpeg.c, which is suboptimal.
-- The new functions were prefixed with jpeg_ and split into separate
files for the compressor and decompressor, per the existing libjpeg
coding standards.
-- jpeg_write_icc_profile() was made slightly more fault-tolerant.
It will now trigger a libjpeg error if it is called before
jpeg_start_compress() or if it is passed NULL arguments.
-- jpeg_read_icc_profile() was made slightly more fault-tolerant.
It will now trigger a libjpeg error if it is called before
jpeg_read_header() or if it is passed NULL arguments. It will also
now trigger libjpeg warnings if the ICC profile data is corrupt.
-- The code comments have been wordsmithed.
-- Note that the one-line setup_read_icc_profile() function was not
included. Instead, libjpeg.txt now documents the need to call
jpeg_save_markers(cinfo, JPEG_APP0 + 2, 0xFFFF) prior to calling
jpeg_read_header(), if jpeg_read_icc_profile() is to be used.
-- Adds documentation for the new functions to libjpeg.txt.
-- Adds an -icc switch to cjpeg and jpegtran that allows those programs
to embed an ICC profile in the JPEG files they generate.
-- Adds an -icc switch to djpeg that allows that program to extract an
ICC profile from a JPEG file while decompressing.
-- Adds appropriate unit tests for all of the above.
-- Bumps the SO_AGE of the libjpeg API library to indicate the presence
of new API functions.
Note that the licensing information was obtained from:
https://github.com/mm2/Little-CMS/issues/37#issuecomment-66450180
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3ab68cf5
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2016-02-19T18:32:10
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libjpeg API: Partial scanline decompression
This, in combination with the existing jpeg_skip_scanlines() function,
provides the ability to crop the image both horizontally and vertically
while decompressing (certain restrictions apply-- see libjpeg.txt.)
This also cleans up the documentation of the line skipping feature and
removes the "strip decompression" feature from djpeg, since the new
cropping feature is a superset of it.
Refer to #34 for discussion.
Closes #34
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83aeb7b2
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2016-02-17T20:05:44
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Wordsmith GIF limitations in cjpeg.1/djpeg.1
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a560e4b4
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2016-01-17T00:00:00
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The Independent JPEG Group's JPEG software v9b
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fc11193e
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2014-01-19T00:00:00
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The Independent JPEG Group's JPEG software v9a
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bc79e068
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1995-08-02T00:00:00
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The Independent JPEG Group's JPEG software v6
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a8b67c4f
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1995-03-15T00:00:00
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The Independent JPEG Group's JPEG software v5b
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36a4cccc
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1994-09-24T00:00:00
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The Independent JPEG Group's JPEG software v5
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cc7150e2
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1993-02-18T00:00:00
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The Independent JPEG Group's JPEG software v4a
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88aeed42
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1992-12-10T00:00:00
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The Independent JPEG Group's JPEG software v4
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4a6b7303
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1992-03-17T00:00:00
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The Independent JPEG Group's JPEG software v3
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bd543f03
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1991-12-13T00:00:00
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The Independent JPEG Group's JPEG software v2
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989630f7
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2010-01-10T00:00:00
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The Independent JPEG Group's JPEG software v8
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5996a25e
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2009-06-27T00:00:00
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The Independent JPEG Group's JPEG software v7
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5ead57a3
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1998-03-27T00:00:00
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The Independent JPEG Group's JPEG software v6b
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7a7da946
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2015-06-27T08:10:31
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Add regression tests for jpeg_skip_scanlines(); change "stripe" to "strip" in djpeg; document -strip and -skip parameters in djpeg
git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/trunk@1587 632fc199-4ca6-4c93-a231-07263d6284db
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9665f5e3
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2014-11-22T04:04:38
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Print the library version and exit whenever -version is passed to cjpeg, djpeg, or jpegtran.
git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/branches/1.4.x@1422 632fc199-4ca6-4c93-a231-07263d6284db
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90d6c382
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2014-05-12T09:08:39
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Document -rgb option in djpeg man page; "gray-scale"="grayscale"
git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/branches/1.3.x@1293 632fc199-4ca6-4c93-a231-07263d6284db
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05524e67
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2014-05-11T23:14:43
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Document the fact that the fast integer FDCT is not fully accelerated for quality levels above 97 + additional wordsmithing
git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/branches/1.3.x@1289 632fc199-4ca6-4c93-a231-07263d6284db
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8940e6ca
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2014-05-11T09:46:28
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Provide a more thorough description of the trade-offs between the various DCT/IDCT algorithms, based on new resarch
git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/branches/1.3.x@1286 632fc199-4ca6-4c93-a231-07263d6284db
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ab70623e
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2013-01-18T23:42:31
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Implement in-memory source/destination managers even when not emulating the libjpeg v8 API/ABI
git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/trunk@913 632fc199-4ca6-4c93-a231-07263d6284db
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cf763c0c
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2013-01-01T09:51:37
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Further changes to the copyright/attribution notices to make it clear that our modified files are not part of the IJG's software.
git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/branches/1.2.x@876 632fc199-4ca6-4c93-a231-07263d6284db
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03badeab
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2013-01-01T09:49:47
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Further changes to the copyright/attribution notices to make it clear that our modified files are not part of the IJG's software.
git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/trunk@875 632fc199-4ca6-4c93-a231-07263d6284db
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27fb3fc5
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2012-01-28T01:48:07
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Support additional scaling factors when decompressing
git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/trunk@753 632fc199-4ca6-4c93-a231-07263d6284db
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66f97e68
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2010-11-23T05:49:54
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Support arithmetic encoding and decoding
git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/trunk@299 632fc199-4ca6-4c93-a231-07263d6284db
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39ea562c
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2010-10-12T01:55:31
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Document new v7/v8 features; .doc = .txt
git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/trunk@252 632fc199-4ca6-4c93-a231-07263d6284db
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c8753072
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2006-05-25T05:01:55
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Migrating to new directory structure adopted from the RealVNC's source tree. More changes will follow.
git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/trunk@1 632fc199-4ca6-4c93-a231-07263d6284db
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