CHANGELOG for Independent JPEG Group's JPEG software

Version 3  17-Mar-92
--------------------

Memory manager is finally capable of swapping to temp files.  There are
separate versions of jmemsys.c for no temp files (same behavior as older
versions), simple temp files with or without tmpfile(), and a DOS-specific
version (including special code for EMS and XMS).  This is probably much more
system-dependent than any of the older code; some bugs may surface here.

Hooks added for user interface to install progress monitoring routine
(percent-done bar, etc).  See comments with dummy progress_monitor
routines in jcdeflts.c, jddeflts.c.

Two-pass color quantization (finally!).  This is now the default method when
quantizing; say '-1' to djpeg for quick-and-ugly 1-pass method.  There is
a test file for checking 2-pass quantization and GIF output.

Fixed bug in jcopy_block_row that broke cjpeg -o option and djpeg -b option
on MSDOS machines.

Miscellaneous small speedups; notably, DCT computation rearranged so that
GCC "inline" feature is no longer needed for good code quality.

File config.c renamed ckconfig.c to avoid name conflict with /etc/config
on Unix systems.

Added example.c to document usage of JPEG subroutines better.

Memory manager now knows how to release all storage during error exit ---
avoids memory leak when using JPEG as subroutines.  This implies a couple
small changes to the subroutine interface: the old free_defaults subroutines
are no longer needed, but if you have a replacement error_exit method then it
must call the new free_all method.  Also, jselvirtmem renamed to jselmemmgr.

Code for reading Targa files with 32-bit pixels was incorrect.

Colorspace conversion slightly faster and more accurate; because of
this, old "test" files will no longer match bit-for-bit.


Version 2  13-Dec-91
--------------------

Documentation improved a little --- there are man pages now.
Installation instructions moved from README to a separate file SETUP.

New program config.c is provided to help you get the configuration options
right.  This should make installation a lot more foolproof.

Sense of djpeg -D switch reversed: dithering is now ON by default.

RLE image file support added (thanks to Mike Lijewski).

Targa image file support added (thanks to Lee Crocker).

PPM input now accepts all PPM and PGM files.

Bug fix: on machines where 'int' is 16 bits, high-Q-setting JPEG files
were not decoded correctly.

Numerous changes to improve portability.  There should be few or no compiler
warnings now.

Makefiles cleaned up; defaults now appropriate for production use rather than
debugging.

Subroutine interface cleaned up.  If you wrote code based on version 1's
jcmain/jdmain, you'll need to change it, but it should get a little shorter
and simpler.


Version 1   7-Oct-91
--------------------

Initial public release.