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Revision 10 - (show annotations) (download)
Mon Sep 6 11:40:06 2010 UTC (9 years, 10 months ago) by william
File size: 11445 byte(s)
exported r3113 from ./upstream/trunk
1 CHANGE LOG for Independent JPEG Group's JPEG software
2
3
4 Version 7 27-Jun-2009
5 ----------------------
6
7 New scaled DCTs implemented.
8 djpeg now supports scalings N/8 with all N from 1 to 16.
9 cjpeg now supports scalings 8/N with all N from 1 to 16.
10 Scaled DCTs with size larger than 8 are now also used for resolving the
11 common 2x2 chroma subsampling case without additional spatial resampling.
12 Separate spatial resampling for those kind of files is now only necessary
13 for N>8 scaling cases.
14 Furthermore, separate scaled DCT functions are provided for direct resolving
15 of the common asymmetric subsampling cases (2x1 and 1x2) without additional
16 spatial resampling.
17
18 cjpeg -quality option has been extended for support of separate quality
19 settings for luminance and chrominance (or in general, for every provided
20 quantization table slot).
21 New API function jpeg_default_qtables() and q_scale_factor array in library.
22
23 Added -nosmooth option to cjpeg, complementary to djpeg.
24 New variable "do_fancy_downsampling" in library, complement to fancy
25 upsampling. Fancy upsampling now uses direct DCT scaling with sizes
26 larger than 8. The old method is not reversible and has been removed.
27
28 Support arithmetic entropy encoding and decoding.
29 Added files jaricom.c, jcarith.c, jdarith.c.
30
31 Straighten the file structure:
32 Removed files jidctred.c, jcphuff.c, jchuff.h, jdphuff.c, jdhuff.h.
33
34 jpegtran has a new "lossless" cropping feature.
35
36 Implement -perfect option in jpegtran, new API function
37 jtransform_perfect_transform() in transupp. (DP 204_perfect.dpatch)
38
39 Better error messages for jpegtran fopen failure.
40 (DP 203_jpegtran_errmsg.dpatch)
41
42 Fix byte order issue with 16bit PPM/PGM files in rdppm.c/wrppm.c:
43 according to Netpbm, the de facto standard implementation of the PNM formats,
44 the most significant byte is first. (DP 203_rdppm.dpatch)
45
46 Add -raw option to rdjpgcom not to mangle the output.
47 (DP 205_rdjpgcom_raw.dpatch)
48
49 Make rdjpgcom locale aware. (DP 201_rdjpgcom_locale.dpatch)
50
51 Add extern "C" to jpeglib.h.
52 This avoids the need to put extern "C" { ... } around #include "jpeglib.h"
53 in your C++ application. Defining the symbol DONT_USE_EXTERN_C in the
54 configuration prevents this. (DP 202_jpeglib.h_c++.dpatch)
55
56
57 Version 6b 27-Mar-1998
58 -----------------------
59
60 jpegtran has new features for lossless image transformations (rotation
61 and flipping) as well as "lossless" reduction to grayscale.
62
63 jpegtran now copies comments by default; it has a -copy switch to enable
64 copying all APPn blocks as well, or to suppress comments. (Formerly it
65 always suppressed comments and APPn blocks.) jpegtran now also preserves
66 JFIF version and resolution information.
67
68 New decompressor library feature: COM and APPn markers found in the input
69 file can be saved in memory for later use by the application. (Before,
70 you had to code this up yourself with a custom marker processor.)
71
72 There is an unused field "void * client_data" now in compress and decompress
73 parameter structs; this may be useful in some applications.
74
75 JFIF version number information is now saved by the decoder and accepted by
76 the encoder. jpegtran uses this to copy the source file's version number,
77 to ensure "jpegtran -copy all" won't create bogus files that contain JFXX
78 extensions but claim to be version 1.01. Applications that generate their
79 own JFXX extension markers also (finally) have a supported way to cause the
80 encoder to emit JFIF version number 1.02.
81
82 djpeg's trace mode reports JFIF 1.02 thumbnail images as such, rather
83 than as unknown APP0 markers.
84
85 In -verbose mode, djpeg and rdjpgcom will try to print the contents of
86 APP12 markers as text. Some digital cameras store useful text information
87 in APP12 markers.
88
89 Handling of truncated data streams is more robust: blocks beyond the one in
90 which the error occurs will be output as uniform gray, or left unchanged
91 if decoding a progressive JPEG. The appearance no longer depends on the
92 Huffman tables being used.
93
94 Huffman tables are checked for validity much more carefully than before.
95
96 To avoid the Unisys LZW patent, djpeg's GIF output capability has been
97 changed to produce "uncompressed GIFs", and cjpeg's GIF input capability
98 has been removed altogether. We're not happy about it either, but there
99 seems to be no good alternative.
100
101 The configure script now supports building libjpeg as a shared library
102 on many flavors of Unix (all the ones that GNU libtool knows how to
103 build shared libraries for). Use "./configure --enable-shared" to
104 try this out.
105
106 New jconfig file and makefiles for Microsoft Visual C++ and Developer Studio.
107 Also, a jconfig file and a build script for Metrowerks CodeWarrior
108 on Apple Macintosh. makefile.dj has been updated for DJGPP v2, and there
109 are miscellaneous other minor improvements in the makefiles.
110
111 jmemmac.c now knows how to create temporary files following Mac System 7
112 conventions.
113
114 djpeg's -map switch is now able to read raw-format PPM files reliably.
115
116 cjpeg -progressive -restart no longer generates any unnecessary DRI markers.
117
118 Multiple calls to jpeg_simple_progression for a single JPEG object
119 no longer leak memory.
120
121
122 Version 6a 7-Feb-96
123 --------------------
124
125 Library initialization sequence modified to detect version mismatches
126 and struct field packing mismatches between library and calling application.
127 This change requires applications to be recompiled, but does not require
128 any application source code change.
129
130 All routine declarations changed to the style "GLOBAL(type) name ...",
131 that is, GLOBAL, LOCAL, METHODDEF, EXTERN are now macros taking the
132 routine's return type as an argument. This makes it possible to add
133 Microsoft-style linkage keywords to all the routines by changing just
134 these macros. Note that any application code that was using these macros
135 will have to be changed.
136
137 DCT coefficient quantization tables are now stored in normal array order
138 rather than zigzag order. Application code that calls jpeg_add_quant_table,
139 or otherwise manipulates quantization tables directly, will need to be
140 changed. If you need to make such code work with either older or newer
141 versions of the library, a test like "#if JPEG_LIB_VERSION >= 61" is
142 recommended.
143
144 djpeg's trace capability now dumps DQT tables in natural order, not zigzag
145 order. This allows the trace output to be made into a "-qtables" file
146 more easily.
147
148 New system-dependent memory manager module for use on Apple Macintosh.
149
150 Fix bug in cjpeg's -smooth option: last one or two scanlines would be
151 duplicates of the prior line unless the image height mod 16 was 1 or 2.
152
153 Repair minor problems in VMS, BCC, MC6 makefiles.
154
155 New configure script based on latest GNU Autoconf.
156
157 Correct the list of include files needed by MetroWerks C for ccommand().
158
159 Numerous small documentation updates.
160
161
162 Version 6 2-Aug-95
163 -------------------
164
165 Progressive JPEG support: library can read and write full progressive JPEG
166 files. A "buffered image" mode supports incremental decoding for on-the-fly
167 display of progressive images. Simply recompiling an existing IJG-v5-based
168 decoder with v6 should allow it to read progressive files, though of course
169 without any special progressive display.
170
171 New "jpegtran" application performs lossless transcoding between different
172 JPEG formats; primarily, it can be used to convert baseline to progressive
173 JPEG and vice versa. In support of jpegtran, the library now allows lossless
174 reading and writing of JPEG files as DCT coefficient arrays. This ability
175 may be of use in other applications.
176
177 Notes for programmers:
178 * We changed jpeg_start_decompress() to be able to suspend; this makes all
179 decoding modes available to suspending-input applications. However,
180 existing applications that use suspending input will need to be changed
181 to check the return value from jpeg_start_decompress(). You don't need to
182 do anything if you don't use a suspending data source.
183 * We changed the interface to the virtual array routines: access_virt_array
184 routines now take a count of the number of rows to access this time. The
185 last parameter to request_virt_array routines is now interpreted as the
186 maximum number of rows that may be accessed at once, but not necessarily
187 the height of every access.
188
189
190 Version 5b 15-Mar-95
191 ---------------------
192
193 Correct bugs with grayscale images having v_samp_factor > 1.
194
195 jpeg_write_raw_data() now supports output suspension.
196
197 Correct bugs in "configure" script for case of compiling in
198 a directory other than the one containing the source files.
199
200 Repair bug in jquant1.c: sometimes didn't use as many colors as it could.
201
202 Borland C makefile and jconfig file work under either MS-DOS or OS/2.
203
204 Miscellaneous improvements to documentation.
205
206
207 Version 5a 7-Dec-94
208 --------------------
209
210 Changed color conversion roundoff behavior so that grayscale values are
211 represented exactly. (This causes test image files to change.)
212
213 Make ordered dither use 16x16 instead of 4x4 pattern for a small quality
214 improvement.
215
216 New configure script based on latest GNU Autoconf.
217 Fix configure script to handle CFLAGS correctly.
218 Rename *.auto files to *.cfg, so that configure script still works if
219 file names have been truncated for DOS.
220
221 Fix bug in rdbmp.c: didn't allow for extra data between header and image.
222
223 Modify rdppm.c/wrppm.c to handle 2-byte raw PPM/PGM formats for 12-bit data.
224
225 Fix several bugs in rdrle.c.
226
227 NEED_SHORT_EXTERNAL_NAMES option was broken.
228
229 Revise jerror.h/jerror.c for more flexibility in message table.
230
231 Repair oversight in jmemname.c NO_MKTEMP case: file could be there
232 but unreadable.
233
234
235 Version 5 24-Sep-94
236 --------------------
237
238 Version 5 represents a nearly complete redesign and rewrite of the IJG
239 software. Major user-visible changes include:
240 * Automatic configuration simplifies installation for most Unix systems.
241 * A range of speed vs. image quality tradeoffs are supported.
242 This includes resizing of an image during decompression: scaling down
243 by a factor of 1/2, 1/4, or 1/8 is handled very efficiently.
244 * New programs rdjpgcom and wrjpgcom allow insertion and extraction
245 of text comments in a JPEG file.
246
247 The application programmer's interface to the library has changed completely.
248 Notable improvements include:
249 * We have eliminated the use of callback routines for handling the
250 uncompressed image data. The application now sees the library as a
251 set of routines that it calls to read or write image data on a
252 scanline-by-scanline basis.
253 * The application image data is represented in a conventional interleaved-
254 pixel format, rather than as a separate array for each color channel.
255 This can save a copying step in many programs.
256 * The handling of compressed data has been cleaned up: the application can
257 supply routines to source or sink the compressed data. It is possible to
258 suspend processing on source/sink buffer overrun, although this is not
259 supported in all operating modes.
260 * All static state has been eliminated from the library, so that multiple
261 instances of compression or decompression can be active concurrently.
262 * JPEG abbreviated datastream formats are supported, ie, quantization and
263 Huffman tables can be stored separately from the image data.
264 * And not only that, but the documentation of the library has improved
265 considerably!
266
267
268 The last widely used release before the version 5 rewrite was version 4A of
269 18-Feb-93. Change logs before that point have been discarded, since they
270 are not of much interest after the rewrite.

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