1991-12-12 19:00:00 -05:00
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CHANGELOG for Independent JPEG Group's JPEG software
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1992-03-16 19:00:00 -05:00
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Version 3 17-Mar-92
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Memory manager is finally capable of swapping to temp files. There are
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separate versions of jmemsys.c for no temp files (same behavior as older
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versions), simple temp files with or without tmpfile(), and a DOS-specific
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version (including special code for EMS and XMS). This is probably much more
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system-dependent than any of the older code; some bugs may surface here.
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Hooks added for user interface to install progress monitoring routine
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(percent-done bar, etc). See comments with dummy progress_monitor
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routines in jcdeflts.c, jddeflts.c.
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Two-pass color quantization (finally!). This is now the default method when
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quantizing; say '-1' to djpeg for quick-and-ugly 1-pass method. There is
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a test file for checking 2-pass quantization and GIF output.
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Fixed bug in jcopy_block_row that broke cjpeg -o option and djpeg -b option
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on MSDOS machines.
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Miscellaneous small speedups; notably, DCT computation rearranged so that
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GCC "inline" feature is no longer needed for good code quality.
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File config.c renamed ckconfig.c to avoid name conflict with /etc/config
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on Unix systems.
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Added example.c to document usage of JPEG subroutines better.
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Memory manager now knows how to release all storage during error exit ---
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avoids memory leak when using JPEG as subroutines. This implies a couple
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small changes to the subroutine interface: the old free_defaults subroutines
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are no longer needed, but if you have a replacement error_exit method then it
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must call the new free_all method. Also, jselvirtmem renamed to jselmemmgr.
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Code for reading Targa files with 32-bit pixels was incorrect.
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Colorspace conversion slightly faster and more accurate; because of
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this, old "test" files will no longer match bit-for-bit.
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1991-12-12 19:00:00 -05:00
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Version 2 13-Dec-91
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--------------------
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Documentation improved a little --- there are man pages now.
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Installation instructions moved from README to a separate file SETUP.
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New program config.c is provided to help you get the configuration options
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right. This should make installation a lot more foolproof.
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Sense of djpeg -D switch reversed: dithering is now ON by default.
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RLE image file support added (thanks to Mike Lijewski).
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Targa image file support added (thanks to Lee Crocker).
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PPM input now accepts all PPM and PGM files.
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Bug fix: on machines where 'int' is 16 bits, high-Q-setting JPEG files
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were not decoded correctly.
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Numerous changes to improve portability. There should be few or no compiler
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warnings now.
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Makefiles cleaned up; defaults now appropriate for production use rather than
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debugging.
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Subroutine interface cleaned up. If you wrote code based on version 1's
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jcmain/jdmain, you'll need to change it, but it should get a little shorter
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and simpler.
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Version 1 7-Oct-91
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--------------------
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Initial public release.
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