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-CHANGE LOG for Independent JPEG Group's JPEG software
-
-
-Version 6b  27-Mar-1998
------------------------
-
-jpegtran has new features for lossless image transformations (rotation
-and flipping) as well as "lossless" reduction to grayscale.
-
-jpegtran now copies comments by default; it has a -copy switch to enable
-copying all APPn blocks as well, or to suppress comments.  (Formerly it
-always suppressed comments and APPn blocks.)  jpegtran now also preserves
-JFIF version and resolution information.
-
-New decompressor library feature: COM and APPn markers found in the input
-file can be saved in memory for later use by the application.  (Before,
-you had to code this up yourself with a custom marker processor.)
-
-There is an unused field "void * client_data" now in compress and decompress
-parameter structs; this may be useful in some applications.
-
-JFIF version number information is now saved by the decoder and accepted by
-the encoder.  jpegtran uses this to copy the source file's version number,
-to ensure "jpegtran -copy all" won't create bogus files that contain JFXX
-extensions but claim to be version 1.01.  Applications that generate their
-own JFXX extension markers also (finally) have a supported way to cause the
-encoder to emit JFIF version number 1.02.
-
-djpeg's trace mode reports JFIF 1.02 thumbnail images as such, rather
-than as unknown APP0 markers.
-
-In -verbose mode, djpeg and rdjpgcom will try to print the contents of
-APP12 markers as text.  Some digital cameras store useful text information
-in APP12 markers.
-
-Handling of truncated data streams is more robust: blocks beyond the one in
-which the error occurs will be output as uniform gray, or left unchanged
-if decoding a progressive JPEG.  The appearance no longer depends on the
-Huffman tables being used.
-
-Huffman tables are checked for validity much more carefully than before.
-
-To avoid the Unisys LZW patent, djpeg's GIF output capability has been
-changed to produce "uncompressed GIFs", and cjpeg's GIF input capability
-has been removed altogether.  We're not happy about it either, but there
-seems to be no good alternative.
-
-The configure script now supports building libjpeg as a shared library
-on many flavors of Unix (all the ones that GNU libtool knows how to
-build shared libraries for).  Use "./configure --enable-shared" to
-try this out.
-
-New jconfig file and makefiles for Microsoft Visual C++ and Developer Studio.
-Also, a jconfig file and a build script for Metrowerks CodeWarrior
-on Apple Macintosh.  makefile.dj has been updated for DJGPP v2, and there
-are miscellaneous other minor improvements in the makefiles.
-
-jmemmac.c now knows how to create temporary files following Mac System 7
-conventions.
-
-djpeg's -map switch is now able to read raw-format PPM files reliably.
-
-cjpeg -progressive -restart no longer generates any unnecessary DRI markers.
-
-Multiple calls to jpeg_simple_progression for a single JPEG object
-no longer leak memory.
-
-
-Version 6a  7-Feb-96
---------------------
-
-Library initialization sequence modified to detect version mismatches
-and struct field packing mismatches between library and calling application.
-This change requires applications to be recompiled, but does not require
-any application source code change.
-
-All routine declarations changed to the style "GLOBAL(type) name ...",
-that is, GLOBAL, LOCAL, METHODDEF, EXTERN are now macros taking the
-routine's return type as an argument.  This makes it possible to add
-Microsoft-style linkage keywords to all the routines by changing just
-these macros.  Note that any application code that was using these macros
-will have to be changed.
-
-DCT coefficient quantization tables are now stored in normal array order
-rather than zigzag order.  Application code that calls jpeg_add_quant_table,
-or otherwise manipulates quantization tables directly, will need to be
-changed.  If you need to make such code work with either older or newer
-versions of the library, a test like "#if JPEG_LIB_VERSION >= 61" is
-recommended.
-
-djpeg's trace capability now dumps DQT tables in natural order, not zigzag
-order.  This allows the trace output to be made into a "-qtables" file
-more easily.
-
-New system-dependent memory manager module for use on Apple Macintosh.
-
-Fix bug in cjpeg's -smooth option: last one or two scanlines would be
-duplicates of the prior line unless the image height mod 16 was 1 or 2.
-
-Repair minor problems in VMS, BCC, MC6 makefiles.
-
-New configure script based on latest GNU Autoconf.
-
-Correct the list of include files needed by MetroWerks C for ccommand().
-
-Numerous small documentation updates.
-
-
-Version 6  2-Aug-95
--------------------
-
-Progressive JPEG support: library can read and write full progressive JPEG
-files.  A "buffered image" mode supports incremental decoding for on-the-fly
-display of progressive images.  Simply recompiling an existing IJG-v5-based
-decoder with v6 should allow it to read progressive files, though of course
-without any special progressive display.
-
-New "jpegtran" application performs lossless transcoding between different
-JPEG formats; primarily, it can be used to convert baseline to progressive
-JPEG and vice versa.  In support of jpegtran, the library now allows lossless
-reading and writing of JPEG files as DCT coefficient arrays.  This ability
-may be of use in other applications.
-
-Notes for programmers:
-* We changed jpeg_start_decompress() to be able to suspend; this makes all
-decoding modes available to suspending-input applications.  However,
-existing applications that use suspending input will need to be changed
-to check the return value from jpeg_start_decompress().  You don't need to
-do anything if you don't use a suspending data source.
-* We changed the interface to the virtual array routines: access_virt_array
-routines now take a count of the number of rows to access this time.  The
-last parameter to request_virt_array routines is now interpreted as the
-maximum number of rows that may be accessed at once, but not necessarily
-the height of every access.
-
-
-Version 5b  15-Mar-95
----------------------
-
-Correct bugs with grayscale images having v_samp_factor > 1.
-
-jpeg_write_raw_data() now supports output suspension.
-
-Correct bugs in "configure" script for case of compiling in
-a directory other than the one containing the source files.
-
-Repair bug in jquant1.c: sometimes didn't use as many colors as it could.
-
-Borland C makefile and jconfig file work under either MS-DOS or OS/2.
-
-Miscellaneous improvements to documentation.
-
-
-Version 5a  7-Dec-94
---------------------
-
-Changed color conversion roundoff behavior so that grayscale values are
-represented exactly.  (This causes test image files to change.)
-
-Make ordered dither use 16x16 instead of 4x4 pattern for a small quality
-improvement.
-
-New configure script based on latest GNU Autoconf.
-Fix configure script to handle CFLAGS correctly.
-Rename *.auto files to *.cfg, so that configure script still works if
-file names have been truncated for DOS.
-
-Fix bug in rdbmp.c: didn't allow for extra data between header and image.
-
-Modify rdppm.c/wrppm.c to handle 2-byte raw PPM/PGM formats for 12-bit data.
-
-Fix several bugs in rdrle.c.
-
-NEED_SHORT_EXTERNAL_NAMES option was broken.
-
-Revise jerror.h/jerror.c for more flexibility in message table.
-
-Repair oversight in jmemname.c NO_MKTEMP case: file could be there
-but unreadable.
-
-
-Version 5  24-Sep-94
---------------------
-
-Version 5 represents a nearly complete redesign and rewrite of the IJG
-software.  Major user-visible changes include:
-  * Automatic configuration simplifies installation for most Unix systems.
-  * A range of speed vs. image quality tradeoffs are supported.
-    This includes resizing of an image during decompression: scaling down
-    by a factor of 1/2, 1/4, or 1/8 is handled very efficiently.
-  * New programs rdjpgcom and wrjpgcom allow insertion and extraction
-    of text comments in a JPEG file.
-
-The application programmer's interface to the library has changed completely.
-Notable improvements include:
-  * We have eliminated the use of callback routines for handling the
-    uncompressed image data.  The application now sees the library as a
-    set of routines that it calls to read or write image data on a
-    scanline-by-scanline basis.
-  * The application image data is represented in a conventional interleaved-
-    pixel format, rather than as a separate array for each color channel.
-    This can save a copying step in many programs.
-  * The handling of compressed data has been cleaned up: the application can
-    supply routines to source or sink the compressed data.  It is possible to
-    suspend processing on source/sink buffer overrun, although this is not
-    supported in all operating modes.
-  * All static state has been eliminated from the library, so that multiple
-    instances of compression or decompression can be active concurrently.
-  * JPEG abbreviated datastream formats are supported, ie, quantization and
-    Huffman tables can be stored separately from the image data.
-  * And not only that, but the documentation of the library has improved
-    considerably!
-
-
-The last widely used release before the version 5 rewrite was version 4A of
-18-Feb-93.  Change logs before that point have been discarded, since they
-are not of much interest after the rewrite.