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diff --git a/jpeg/change.log b/jpeg/change.log deleted file mode 100644 index 729bca6..0000000 --- a/jpeg/change.log +++ /dev/null @@ -1,346 +0,0 @@ -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. |