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Make rdjpgcom locale aware. (DP 201_rdjpgcom_locale.dpatch)

Add extern "C" to jpeglib.h.
This avoids the need to put extern "C" { ... } around #include "jpeglib.h"
in your C++ application.  Defining the symbol DONT_USE_EXTERN_C in the
configuration prevents this. (DP 202_jpeglib.h_c++.dpatch)


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