FreeImage: folders restructurization

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-CHANGE LOG for Independent JPEG Group's JPEG software

-

-

-Version 8d  15-Jan-2012

------------------------

-

-Add cjpeg -rgb option to create RGB JPEG files.

-Using this switch suppresses the conversion from RGB

-colorspace input to the default YCbCr JPEG colorspace.

-This feature allows true lossless JPEG coding of RGB color images.

-The recommended command for this purpose is currently

-cjpeg -rgb -block 1 -arithmetic.

-SmartScale capable decoder (introduced with IJG JPEG 8) required.

-Thank to Michael Koch for the initial suggestion.

-

-Add option to disable the region adjustment in the transupp crop code.

-Thank to Jeffrey Friedl for the suggestion.

-

-Thank to Richard Jones and Edd Dawson for various minor corrections.

-

-Thank to Akim Demaille for configure.ac cleanup.

-

-

-Version 8c  16-Jan-2011

------------------------

-

-Add option to compression library and cjpeg (-block N) to use

-different DCT block size.

-All N from 1 to 16 are possible.  Default is 8 (baseline format).

-Larger values produce higher compression,

-smaller values produce higher quality.

-SmartScale capable decoder (introduced with IJG JPEG 8) required.

-

-

-Version 8b  16-May-2010

------------------------

-

-Repair problem in new memory source manager with corrupt JPEG data.

-Thank to Ted Campbell and Samuel Chun for the report.

-

-Repair problem in Makefile.am test target.

-Thank to anonymous user for the report.

-

-Support MinGW installation with automatic configure.

-Thank to Volker Grabsch for the suggestion.

-

-

-Version 8a  28-Feb-2010

------------------------

-

-Writing tables-only datastreams via jpeg_write_tables works again.

-

-Support 32-bit BMPs (RGB image with Alpha channel) for read in cjpeg.

-Thank to Brett Blackham for the suggestion.

-

-Improve accuracy in floating point IDCT calculation.

-Thank to Robert Hooke for the hint.

-

-

-Version 8  10-Jan-2010

-----------------------

-

-jpegtran now supports the same -scale option as djpeg for "lossless" resize.

-An implementation of the JPEG SmartScale extension is required for this

-feature.  A (draft) specification of the JPEG SmartScale extension is

-available as a contributed document at ITU and ISO.  Revision 2 or later

-of the document is required (latest document version is Revision 3).

-The SmartScale extension will enable more features beside lossless resize

-in future implementations, as described in the document (new compression

-options).

-

-Add sanity check in BMP reader module to avoid cjpeg crash for empty input

-image (thank to Isaev Ildar of ISP RAS, Moscow, RU for reporting this error).

-

-Add data source and destination managers for read from and write to

-memory buffers.  New API functions jpeg_mem_src and jpeg_mem_dest.

-Thank to Roberto Boni from Italy for the suggestion.

-

-

-Version 7  27-Jun-2009

-----------------------

-

-New scaled DCTs implemented.

-djpeg now supports scalings N/8 with all N from 1 to 16.

-cjpeg now supports scalings 8/N with all N from 1 to 16.

-Scaled DCTs with size larger than 8 are now also used for resolving the

-common 2x2 chroma subsampling case without additional spatial resampling.

-Separate spatial resampling for those kind of files is now only necessary

-for N>8 scaling cases.

-Furthermore, separate scaled DCT functions are provided for direct resolving

-of the common asymmetric subsampling cases (2x1 and 1x2) without additional

-spatial resampling.

-

-cjpeg -quality option has been extended for support of separate quality

-settings for luminance and chrominance (or in general, for every provided

-quantization table slot).

-New API function jpeg_default_qtables() and q_scale_factor array in library.

-

-Added -nosmooth option to cjpeg, complementary to djpeg.

-New variable "do_fancy_downsampling" in library, complement to fancy

-upsampling.  Fancy upsampling now uses direct DCT scaling with sizes

-larger than 8.  The old method is not reversible and has been removed.

-

-Support arithmetic entropy encoding and decoding.

-Added files jaricom.c, jcarith.c, jdarith.c.

-

-Straighten the file structure:

-Removed files jidctred.c, jcphuff.c, jchuff.h, jdphuff.c, jdhuff.h.

-

-jpegtran has a new "lossless" cropping feature.

-

-Implement -perfect option in jpegtran, new API function

-jtransform_perfect_transform() in transupp. (DP 204_perfect.dpatch)

-

-Better error messages for jpegtran fopen failure.

-(DP 203_jpegtran_errmsg.dpatch)

-

-Fix byte order issue with 16bit PPM/PGM files in rdppm.c/wrppm.c:

-according to Netpbm, the de facto standard implementation of the PNM formats,

-the most significant byte is first. (DP 203_rdppm.dpatch)

-

-Add -raw option to rdjpgcom not to mangle the output.

-(DP 205_rdjpgcom_raw.dpatch)

-

-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

-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.