2
CHANGES - changes for libpng
5
added reader into png.h
6
fixed small problems in stub file
9
split up pngwrite.c to several files
12
cleaned up writer, adding a few new tranformations
13
fixed some bugs in writer
14
interfaced with zlib 0.5
16
added check for 64 KB blocks for 16 bit machines
18
cleaned up code and commented code
19
simplified time handling into png_time
20
created png_color_16 and png_color_8 to handle color needs
21
cleaned up color type defines
23
made various names more consistant
24
interfaced with zlib 0.71
25
cleaned up zTXt reader and writer (using zlib's Reset functions)
26
split transformations into pngrtran.c and pngwtran.c
28
interfaced with zlib 0.8
29
fixed many reading and writing bugs
30
saved using 3 spaces instead of tabs
32
added png_large_malloc() and png_large_free()
34
cleaned up some compiler warnings
35
added png_start_read_image()
37
cleaned up lots of bugs
38
finished dithering and other stuff
40
changed name from pnglib to libpng
41
version 0.71 [June, 1995]
42
changed pngtest.png for zlib 0.93
43
fixed error in libpng.txt and example.c
46
added png_set_filler()
47
split up pngstub.c into pngmem.c, pngio.c, and pngerror.c
48
added #define's to remove unwanted code
49
moved png_info_init() to png.c
50
added old_size into png_realloc()
51
added functions to manually set filtering and compression info
52
changed compression parameters based on image type
53
optimized filter selection code
55
changed external functions passing floats to doubles (k&r problems?)
56
put all the configurable stuff in pngconf.h
57
enabled png_set_shift to work with paletted images on read
58
added png_read_update_info() - updates info structure with
60
version 0.81 [August, 1995]
61
incorporated Tim Wegner's medium model code (thanks, Tim)
62
version 0.82 [September, 1995]
64
version 0.85 [December, 1995]
65
added more medium model code (almost everything's a far)
66
added i/o, error, and memory callback functions
67
fixed some bugs (16 bit, 4 bit interlaced, etc.)
68
added first run progressive reader (barely tested)
69
version 0.86 [January, 1996]
71
improved documentation
72
version 0.87 [January, 1996]
73
fixed medium model bugs
74
fixed other bugs introduced in 0.85 and 0.86
75
added some minor documentation
76
version 0.88 [January, 1996]
77
fixed progressive bugs
78
replaced tabs with spaces
79
cleaned up documentation
80
added callbacks for read/write and warning/error functions
81
version 0.89 [July, 1996]
82
added new initialization API to make libpng work better with shared libs
83
we now have png_create_read_struct(), png_create_write_struct(),
84
png_create_info_struct(), png_destroy_read_struct(), and
85
png_destroy_write_struct() instead of the separate calls to
86
malloc and png_read_init(), png_info_init(), and png_write_init()
87
changed warning/error callback functions to fix bug - this means you
88
should use the new initialization API if you were using the old
89
png_set_message_fn() calls, and that the old API no longer exists
90
so that people are aware that they need to change their code
91
changed filter selection API to allow selection of multiple filters
92
since it didn't work in previous versions of libpng anyways
93
optimized filter selection code
94
fixed png_set_background() to allow using an arbitrary RGB color for
96
fixed gamma and background correction for paletted images, so
97
png_correct_palette is not needed unless you are correcting an
98
external palette (you will need to #define PNG_CORRECT_PALETTE_SUPPORTED
99
in pngconf.h) - if nobody uses this, it may disappear in the future.
100
fixed bug with Borland 64K memory allocation (Alexander Lehmann)
101
fixed bug in interlace handling (Smarasderagd, I think)
102
added more error checking for writing and image to reduce invalid files
103
separated read and write functions so that they won't both be linked
104
into a binary when only reading or writing functionality is used
105
new pngtest image also has interlacing and zTXt
106
updated documentation to reflect new API
107
version 0.90 [January, 1997]
108
made CRC errors/warnings on critical and ancillary chunks configurable
109
libpng will use the zlib CRC routines by (compile-time) default
110
changed DOS small/medium model memory support - needs zlib 1.04 (Tim Wegner)
111
added external C++ wrapper statements to png.h (Gilles Dauphin)
112
allow PNG file to be read when some or all of file signature has already
113
been read from the beginning of the stream. ****This affects the size
114
of info_struct and invalidates all programs that use a shared libpng****
115
fixed png_filler() declarations
116
fixed? background color conversions
117
fixed order of error function pointers to match documentation
118
current chunk name is now available in png_struct to reduce the number
119
of nearly identical error messages (will simplify multi-lingual
120
support when available)
121
try to get ready for unknown-chunk callback functions:
122
- previously read critical chunks are flagged, so the chunk handling
123
routines can determine if the chunk is in the right place
124
- all chunk handling routines have the same prototypes, so we will
125
be able to handle all chunks via a callback mechanism
126
try to fix Linux "setjmp" buffer size problems
127
removed png_large_malloc, png_large_free, and png_realloc functions.
128
version 0.95 [March, 1997]
129
fixed bug in pngwutil.c allocating "up_row" twice and "avg_row" never
130
fixed bug in PNG file signature compares when start != 0
131
changed parameter type of png_set_filler(...filler...) from png_byte
133
added test for MACOS to ensure that both math.h and fp.h are not #included
134
added macros for libpng to be compiled as a Windows DLL (Andreas Kupries)
135
added "packswap" transformation, which changes the endianness of
136
packed-pixel bytes (Kevin Bracey)
137
added "strip_alpha" transformation, which removes the alpha channel of
138
input images without using it (not neccesarily a good idea)
139
added "swap_alpha" transformation, which puts the alpha channel in front
140
of the color bytes instead of after
141
removed all implicit variable tests which assume NULL == 0 (I think)
142
changed several variables to "png_size_t" to show 16/32-bit limitations
143
added new pCAL chunk read/write support
144
added experimental filter selection weighting (Greg Roelofs)
145
removed old png_set_rgbx() and png_set_xrgb() functions that have been
146
obsolete for about 2 years now (use png_set_filler() instead)
147
added macros to read 16- and 32-bit ints directly from buffer, to be
148
used only on those systems that support it (namely PowerPC and 680x0)
149
With some testing, this may become the default for MACOS/PPC systems.
150
only calculate CRC on data if we are going to use it
151
added macros for zTXt compression type PNG_zTXt_COMPRESSION_???
152
added macros for simple libpng debugging output selectable at compile time
153
removed PNG_READ_END_MODE in progressive reader (Smarasderagd)
154
more description of info_struct in libpng.txt and png.h
155
more instructions in example.c
156
more chunk types tested in pngtest.c
157
renamed pngrcb.c to pngset.c, and all png_read_<chunk> functions to be
158
png_set_<chunk>. We now have corresponding png_get_<chunk>
159
functions in pngget.c to get infomation in info_ptr. This isolates
160
the application from the internal organization of png_info_struct
161
(good for shared library implementations).
162
version 0.96 [May, 1997]
163
fixed serious bug with < 8bpp images introduced in 0.95
164
fixed 256-color transparency bug (Greg Roelofs)
165
fixed up documentation (Greg Roelofs, Laszlo Nyul)
166
fixed "error" in pngconf.h for Linux setjmp() behaviour
167
fixed DOS medium model support (Tim Wegner)
168
fixed png_check_keyword() for case with error in static string text
169
added read of CRC after IEND chunk for embedded PNGs (Laszlo Nyul)
170
added typecasts to quiet compiler errors
171
added more debugging info
172
version 0.97 [January, 1998]
173
removed PNG_USE_OWN_CRC capability
174
relocated png_set_crc_action from pngrutil.c to pngrtran.c
175
fixed typecasts of "new_key", etc. (Andreas Dilger)
176
added RFC 1152 [sic] date support
177
fixed bug in gamma handling of 4-bit grayscale
178
added 2-bit grayscale gamma handling (Glenn R-P)
179
added more typecasts. 65536L becomes (png_uint_32)65536L, etc. (Glenn R-P)
180
minor corrections in libpng.txt
181
added simple sRGB support (Glenn R-P)
182
easier conditional compiling, e.g. define PNG_READ/WRITE_NOT_FULLY_SUPPORTED;
183
all configurable options can be selected from command-line instead
184
of having to edit pngconf.h (Glenn R-P)
185
fixed memory leak in pngwrite.c (free info_ptr->text) (Glenn R-P)
186
added more conditions for png_do_background, to avoid changing
187
black pixels to background when a background is supplied and
188
no pixels are transparent
189
repaired PNG_NO_STDIO behaviour
190
tested NODIV support and made it default behaviour (Greg Roelofs)
191
added "-m" option and PNGTEST_DEBUG_MEMORY to pngtest (John Bowler)
192
regularized version numbering scheme and bumped shared-library major
193
version number to 2 to avoid problems with libpng 0.89 apps (Greg Roelofs)
194
version 0.98 [January, 1998]
195
cleaned up some typos in libpng.txt and in code documentation
196
fixed memory leaks in pCAL chunk processing (Glenn R-P and John Bowler)
197
cosmetic change "display_gamma" to "screen_gamma" in pngrtran.c
198
changed recommendation about file_gamma for PC images to .51 from .45,
199
in example.c and libpng.txt, added comments to distinguish between
200
screen_gamma, viewing_gamma, and display_gamma.
201
changed all references to RFC1152 to read RFC1123 and changed the
202
PNG_TIME_RFC1152_SUPPORTED macro to PNG_TIME_RFC1123_SUPPORTED
203
added png_invert_alpha capability (Glenn R-P -- suggestion by Jon Vincent)
204
changed srgb_intent from png_byte to int to avoid compiler bugs
205
version 0.99 [January 30, 1998]
206
free info_ptr->text instead of end_info_ptr->text in pngread.c (John Bowler)
207
fixed a longstanding "packswap" bug in pngtrans.c
208
fixed some inconsistencies in pngconf.h that prevented compiling with
209
PNG_READ_GAMMA_SUPPORTED and PNG_READ_hIST_SUPPORTED undefined
210
fixed some typos and made other minor rearrangement of libpng.txt (Andreas)
211
changed recommendation about file_gamma for PC images to .50 from .51 in
212
example.c and libpng.txt, and changed file_gamma for sRGB images to .45
213
added a number of functions to access information from the png structure
214
png_get_image_height(), etc. (Glenn R-P, suggestion by Brad Pettit)
215
added TARGET_MACOS similar to zlib-1.0.8
216
define PNG_ALWAYS_EXTERN when __MWERKS__ && WIN32 are defined
217
added type casting to all png_malloc() function calls
218
version 0.99a [January 31, 1998]
219
Added type casts and parentheses to all returns that return a value.(Tim W.)
220
version 0.99b [February 4, 1998]
221
Added type cast png_uint_32 on malloc function calls where needed.
222
Changed type of num_hist from png_uint_32 to int (same as num_palette).
223
Added checks for rowbytes overflow, in case png_size_t is less than 32 bits.
224
Renamed makefile.elf to makefile.lnx.
225
version 0.99c [February 7, 1998]
226
More type casting. Removed erroneous overflow test in pngmem.c.
227
Added png_buffered_memcpy() and png_buffered_memset(), apply them to rowbytes.
228
Added UNIX manual pages libpng.3 (incorporating libpng.txt) and png.5.
229
version 0.99d [February 11, 1998]
230
Renamed "far_to_near()" "png_far_to_near()"
232
Version 99c "buffered" operations didn't work as intended. Replaced them
233
with png_memcpy_check() and png_memset_check().
234
Added many "if (png_ptr == NULL) return" to quell compiler warnings about
235
unused png_ptr, mostly in pngget.c and pngset.c.
236
Check for overlength tRNS chunk present when indexed-color PLTE is read.
237
Cleaned up spelling errors in libpng.3/libpng.txt
238
Corrected a problem with png_get_tRNS() which returned undefined trans array
239
version 0.99e [February 28, 1998]
240
Corrected png_get_tRNS() again.
241
Add parentheses for easier reading of pngget.c, fixed "||" should be "&&".
242
Touched up example.c to make more of it compileable, although the entire
243
file still can't be compiled (Willem van Schaik)
244
Fixed a bug in png_do_shift() (Bryan Tsai)
245
Added a space in png.h prototype for png_write_chunk_start()
246
Replaced pngtest.png with one created with zlib 1.1.1
247
Changed pngtest to report PASS even when file size is different (Jean-loup G.)
248
Corrected some logic errors in png_do_invert_alpha() (Chris Patterson)
249
version 0.99f [March 5, 1998]
250
Corrected a bug in pngpread() introduced in version 99c (Kevin Bracey)
251
Moved makefiles into a "scripts" directory, and added INSTALL instruction file
252
Added makefile.os2 and pngos2.def (A. Zabolotny) and makefile.s2x (W. Sebok)
253
Added pointers to "note on libpng versions" in makefile.lnx and README
254
Added row callback feature when reading and writing nonprogressive rows
255
and added a test of this feature in pngtest.c
256
Added user transform callbacks, with test of the feature in pngtest.c
257
version 0.99g [March 6, 1998, morning]
258
Minor changes to pngtest.c to suppress compiler warnings.
259
Removed "beta" language from documentation.
260
version 0.99h [March 6, 1998, evening]
261
Minor changes to previous minor changes to pngtest.c
262
Changed PNG_READ_NOT_FULLY_SUPPORTED to PNG_READ_TRANSFORMS_NOT_SUPPORTED
263
and added PNG_PROGRESSIVE_READ_NOT_SUPPORTED macro
264
Added user transform capability
265
version 1.00 [March 7, 1998]
266
Changed several typedefs in pngrutil.c
267
Added makefile.wat (Pawel Mrochen), updated makefile.tc3 (Willem van Schaik)
268
replaced "while(1)" with "for(;;)"
269
added PNGARG() to prototypes in pngtest.c and removed some prototypes
270
updated some of the makefiles (Tom Lane)
271
changed some typedefs (s_start, etc.) in pngrutil.c
272
fixed dimensions of "short_months" array in pngwrite.c
273
Replaced ansi2knr.c with the one from jpeg-v6
274
version 1.0.0 [March 8, 1998]
275
Changed name from 1.00 to 1.0.0 (Adam Costello)
276
Added smakefile.ppc (with SCOPTIONS.ppc) for Amiga PPC (Andreas Kleinert)
277
version 1.0.0a [March 9, 1998]
278
Fixed three bugs in pngrtran.c to make gamma+background handling consistent
280
Changed format of the PNG_LIBPNG_VER integer to xyyzz instead of xyz
281
for major, minor, and bugfix releases. This is 10001. (Adam Costello,
283
Make months range from 1-12 in png_convert_to_rfc1123
284
version 1.0.0b [March 13, 1998]
285
Quieted compiler complaints about two empty "for" loops in pngrutil.c
286
Minor changes to makefile.s2x
287
Removed #ifdef/#endif around a png_free() in pngread.c
288
version 1.0.1 [March 14, 1998]
289
Changed makefile.s2x to reduce security risk of using a relative pathname
290
Fixed some typos in the documentation (Greg).
291
Fixed a problem with value of "channels" returned by png_read_update_info()
292
version 1.0.1a [April 21, 1998]
293
Optimized Paeth calculations by replacing abs() function calls with intrinsics
294
plus other loop optimizations. Improves avg decoding speed by about 20%.
295
Commented out i386istic "align" compiler flags in makefile.lnx.
296
Reduced the default warning level in some makefiles, to make them consistent.
297
Removed references to IJG and JPEG in the ansi2knr.c copyright statement.
298
Fixed a bug in png_do_strip_filler with XXRRGGBB => RRGGBB transformation.
299
Added grayscale and 16-bit capability to png_do_read_filler().
300
Fixed a bug in pngset.c, introduced in version 0.99c, that sets rowbytes
301
too large when writing an image with bit_depth < 8 (Bob Dellaca).
302
Corrected some bugs in the experimental weighted filtering heuristics.
303
Moved a misplaced pngrutil code block that truncates tRNS if it has more
304
than num_palette entries -- test was done before num_palette was defined.
305
Fixed a png_convert_to_rfc1123() bug that converts day 31 to 0 (Steve Eddins).
306
Changed compiler flags in makefile.wat for better optimization (Pawel Mrochen).
307
version 1.0.1b [May 2, 1998]
308
Relocated png_do_gray_to_rgb() within png_do_read_transformations() (Greg).
309
Relocated the png_composite macros from pngrtran.c to png.h (Greg).
310
Added makefile.sco (contributed by Mike Hopkirk).
311
Fixed two bugs (missing definitions of "istop") introduced in libpng-1.0.1a.
312
Fixed a bug in pngrtran.c that would set channels=5 under some circumstances.
313
More work on the Paeth-filtering, achieving imperceptible speedup (A Kleinert).
314
More work on loop optimization which may help when compiled with C++ compilers.
315
Added warnings when people try to use transforms they've defined out.
316
Collapsed 4 "i" and "c" loops into single "i" loops in pngrtran and pngwtran.
317
Revised paragraph about png_set_expand() in libpng.txt and libpng.3 (Greg)
318
version 1.0.1c [May 11, 1998]
319
Fixed a bug in pngrtran.c (introduced in libpng-1.0.1a) where the masks for
320
filler bytes should have been 0xff instead of 0xf.
321
Added max_pixel_depth=32 in pngrutil.c when using FILLER with palette images.
322
Moved PNG_WRITE_WEIGHTED_FILTER_SUPPORTED and PNG_WRITE_FLUSH_SUPPORTED
323
out of the PNG_WRITE_TRANSFORMS_NOT_SUPPORTED block of pngconf.h
324
Added "PNG_NO_WRITE_TRANSFORMS" etc., as alternatives for *_NOT_SUPPORTED,
325
for consistency, in pngconf.h
326
Added individual "ifndef PNG_NO_[CAPABILITY]" in pngconf.h to make it easier
327
to remove unwanted capabilities via the compile line
328
Made some corrections to grammar (which, it's) in documentation (Greg).
329
Corrected example.c, use of row_pointers in png_write_image().
330
version 1.0.1d [May 24, 1998]
331
Corrected several statements that used side effects illegally in pngrutil.c
332
and pngtrans.c, that were introduced in version 1.0.1b
333
Revised png_read_rows() to avoid repeated if-testing for NULL (A Kleinert)
334
More corrections to example.c, use of row_pointers in png_write_image()
336
Added pngdll.mak and pngdef.pas to scripts directory, contributed by
337
Bob Dellaca, to make a png32bd.dll with Borland C++ 4.5
338
Fixed error in example.c with png_set_text: num_text is 3, not 2 (Guido V.)
339
Changed several loops from count-down to count-up, for consistency.
340
version 1.0.1e [June 6, 1998]
341
Revised libpng.txt and libpng.3 description of png_set_read|write_fn(), and
342
added warnings when people try to set png_read_fn and png_write_fn in
344
Added a test such that png_do_gamma will be done when num_trans==0
345
for truecolor images that have defined a background. This corrects an
346
error that was introduced in libpng-0.90 that can cause gamma processing
348
Added tests in png.h to include "trans" and "trans_values" in structures
349
when PNG_READ_BACKGROUND_SUPPORTED or PNG_READ_EXPAND_SUPPORTED is defined.
350
Add png_free(png_ptr->time_buffer) in png_destroy_read_struct()
351
Moved png_convert_to_rfc_1123() from pngwrite.c to png.c
352
Added capability for user-provided malloc_fn() and free_fn() functions,
353
and revised pngtest.c to demonstrate their use, replacing the
354
PNGTEST_DEBUG_MEM feature.
355
Added makefile.w32, for Microsoft C++ 4.0 and later (Tim Wegner).
356
version 1.0.2 [June 14, 1998]
357
Fixed two bugs in makefile.bor .
358
version 1.0.2a [December 30, 1998]
359
Replaced and extended code that was removed from png_set_filler() in 1.0.1a.
360
Fixed a bug in png_do_filler() that made it fail to write filler bytes in
361
the left-most pixel of each row (Kevin Bracey).
362
Changed "static pngcharp tIME_string" to "static char tIME_string[30]"
363
in pngtest.c (Duncan Simpson).
364
Fixed a bug in pngtest.c that caused pngtest to try to write a tIME chunk
365
even when no tIME chunk was present in the source file.
366
Fixed a problem in pngrutil.c: gray_to_rgb didn't always work with 16-bit.
367
Fixed a problem in png_read_push_finish_row(), which would not skip some
368
passes that it should skip, for images that are less than 3 pixels high.
369
Interchanged the order of calls to png_do_swap() and png_do_shift()
370
in pngwtran.c (John Cromer).
371
Added #ifdef PNG_DEBUG/#endif surrounding use of PNG_DEBUG in png.h .
372
Changed "bad adaptive filter type" from error to warning in pngrutil.c .
373
Fixed a documentation error about default filtering with 8-bit indexed-color.
374
Separated the PNG_NO_STDIO macro into PNG_NO_STDIO and PNG_NO_CONSOLE_IO
376
Added png_set_rgb_to_gray() and png_get_rgb_to_gray_status() functions.
377
Added png_get_copyright() and png_get_header_version() functions.
378
Revised comments on png_set_progressive_read_fn() in libpng.txt and example.c
379
Added information about debugging in libpng.txt and libpng.3 .
380
Changed "ln -sf" to "ln -s -f" in makefile.s2x, makefile.lnx, and makefile.sco.
381
Removed lines after Dynamic Dependencies" in makefile.aco .
382
Revised makefile.dec to make a shared library (Jeremie Petit).
383
Removed trailing blanks from all files.
384
version 1.0.2a [January 6, 1999]
385
Removed misplaced #endif and #ifdef PNG_NO_EXTERN near the end of png.h
386
Added "if" tests to silence complaints about unused png_ptr in png.h and png.c
387
Changed "check_if_png" function in example.c to return true (nonzero) if PNG.
388
Changed libpng.txt to demonstrate png_sig_cmp() instead of png_check_sig()
390
version 1.0.3 [January 14, 1999]
391
Added makefile.hux, for Hewlett Packard HPUX 10.20 and 11.00 (Jim Rice)
392
Added a statement of Y2K compliance in png.h, libpng.3, and Y2KINFO.
393
version 1.0.3a [August 12, 1999]
394
Added check for PNG_READ_INTERLACE_SUPPORTED in pngread.c; issue a warning
395
if an attempt is made to read an interlaced image when it's not supported.
396
Added check if png_ptr->trans is defined before freeing it in pngread.c
397
Modified the Y2K statement to include versions back to version 0.71
398
Fixed a bug in the check for valid IHDR bit_depth/color_types in pngrutil.c
399
Modified makefile.wat (added -zp8 flag, ".symbolic", changed some comments)
400
Replaced leading blanks with tab characters in makefile.hux
401
Changed "dworkin.wustl.edu" to "ccrc.wustl.edu" in various documents.
402
Changed (float)red and (float)green to (double)red, (double)green
403
in png_set_rgb_to_gray() to avoid "promotion" problems in AIX.
404
Fixed a bug in pngconf.h that omitted <stdio.h> when PNG_DEBUG==0 (K Bracey).
405
Reformatted libpng.3 and libpngpf.3 with proper fonts (script by J. vanZandt).
406
Updated documentation to refer to the PNG-1.2 specification.
407
Removed ansi2knr.c and left pointers to the latest source for ansi2knr.c
408
in makefile.knr, INSTALL, and README (L. Peter Deutsch)
409
Fixed bugs in calculation of the length of rowbytes when adding alpha
410
channels to 16-bit images, in pngrtran.c (Chris Nokleberg)
411
Added function png_set_user_transform_info() to store user_transform_ptr,
412
user_depth, and user_channels into the png_struct, and a function
413
png_get_user_transform_ptr() to retrieve the pointer (Chris Nokleberg)
414
Added function png_set_empty_plte_permitted() to make libpng useable
416
Corrected the typedef for png_free_ptr in png.h (Jesse Jones).
417
Correct gamma with srgb is 45455 instead of 45000 in pngrutil.c, to be
418
consistent with PNG-1.2, and allow variance of 500 before complaining.
419
Added assembler code contributed by Intel in file pngvcrd.c and modified
420
makefile.w32 to use it (Nirav Chhatrapati, INTEL Corporation, Gilles Vollant)
421
Changed "ln -s -f" to "ln -f -s" in the makefiles to make Solaris happy.
422
Added some aliases for png_set_expand() in pngrtran.c, namely
423
png_set_expand_PLTE(), png_set_expand_depth(), and png_set_expand_tRNS()
424
(Greg Roelofs, in "PNG: The Definitive Guide").
425
Added makefile.beo for BEOS on X86, contributed by Sander Stok.
426
version 1.0.3b [August 26, 1999]
427
Replaced 2147483647L several places with PNG_MAX_UINT macro, defined in png.h
428
Changed leading blanks to tabs in all makefiles.
429
Define PNG_USE_PNGVCRD in makefile.w32, to get MMX assembler code.
430
Made alternate versions of png_set_expand() in pngrtran.c, namely
431
png_set_gray_1_2_4_to_8, png_set_palette_to_rgb, and png_set_tRNS_to_alpha
432
(Greg Roelofs, in "PNG: The Definitive Guide"). Deleted the 1.0.3a aliases.
433
Relocated start of 'extern "C"' block in png.h so it doesn't include pngconf.h
434
Revised calculation of num_blocks in pngmem.c to avoid a potentially
435
negative shift distance, whose results are undefined in the C language.
436
Added a check in pngset.c to prevent writing multiple tIME chunks.
437
Added a check in pngwrite.c to detect invalid small window_bits sizes.
438
version 1.0.3d [September 4, 1999]
439
Fixed type casting of igamma in pngrutil.c
440
Added new png_expand functions to scripts/pngdef.pas and pngos2.def
441
Added a demo read_user_transform_fn that examines the row filters in pngtest.c
442
version 1.0.4 [September 24, 1999]
443
Define PNG_ALWAYS_EXTERN in pngconf.h if __STDC__ is defined
444
Delete #define PNG_INTERNAL and include "png.h" from pngasmrd.h
445
Made several minor corrections to pngtest.c
446
Renamed the makefiles with longer but more user friendly extensions.
447
Copied the PNG copyright and license to a separate LICENSE file.
448
Revised documentation, png.h, and example.c to remove reference to
449
"viewing_gamma" which no longer appears in the PNG specification.
450
Revised pngvcrd.c to use MMX code for interlacing only on the final pass.
451
Updated pngvcrd.c to use the faster C filter algorithms from libpng-1.0.1a
452
Split makefile.win32vc into two versions, makefile.vcawin32 (uses MMX
453
assembler code) and makefile.vcwin32 (doesn't).
454
Added a CPU timing report to pngtest.c (enabled by defining PNGTEST_TIMING)
455
Added a copy of pngnow.png to the distribution.
456
version 1.0.4a [September 25, 1999]
457
Increase max_pixel_depth in pngrutil.c if a user transform needs it.
458
Changed several division operations to right-shifts in pngvcrd.c
459
version 1.0.4b [September 30, 1999]
460
Added parentheses in line 3732 of pngvcrd.c
461
Added a comment in makefile.linux warning about buggy -O3 in pgcc 2.95.1
462
version 1.0.4c [October 1, 1999]
463
Added a "png_check_version" function in png.c and pngtest.c that will generate
464
a helpful compiler error if an old png.h is found in the search path.
465
Changed type of png_user_transform_depth|channels from int to png_byte.
466
version 1.0.4d [October 6, 1999]
467
Changed 0.45 to 0.45455 in png_set_sRGB()
468
Removed unused PLTE entries from pngnow.png
469
Re-enabled some parts of pngvcrd.c (png_combine_row) that work properly.
470
version 1.0.4e [October 10, 1999]
471
Fixed sign error in pngvcrd.c (Greg Roelofs)
472
Replaced some instances of memcpy with simple assignments in pngvcrd (GR-P)
473
version 1.0.4f [October 15, 1999]
474
Surrounded example.c code with #if 0 .. #endif to prevent people from
475
inadvertently trying to compile it.
476
Changed png_get_header_version() from a function to a macro in png.h
477
Added type casting mostly in pngrtran.c and pngwtran.c
478
Removed some pointless "ptr = NULL" in pngmem.c
479
Added a "contrib" directory containing the source code from Greg's book.
480
version 1.0.5 [October 15, 1999]
481
Minor editing of the INSTALL and README files.
482
version 1.0.5a [October 23, 1999]
483
Added contrib/pngsuite and contrib/pngminus (Willem van Schaik)
484
Fixed a typo in the png_set_sRGB() function call in example.c (Jan Nijtmans)
485
Further optimization and bugfix of pngvcrd.c
486
Revised pngset.c so that it does not allocate or free memory in the user's
487
text_ptr structure. Instead, it makes its own copy.
488
Created separate write_end_info_struct in pngtest.c for a more severe test.
489
Added code in pngwrite.c to free info_ptr->text[i].key to stop a memory leak.
490
version 1.0.5b [November 23, 1999]
491
Moved PNG_FLAG_HAVE_CHUNK_HEADER, PNG_FLAG_BACKGROUND_IS_GRAY and
492
PNG_FLAG_WROTE_tIME from flags to mode.
493
Added png_write_info_before_PLTE() function.
494
Fixed some typecasting in contrib/gregbook/*.c
495
Updated scripts/makevms.com and added makevms.com to contrib/gregbook
496
and contrib/pngminus (Martin Zinser)
497
version 1.0.5c [November 26, 1999]
498
Moved png_get_header_version from png.h to png.c, to accomodate ansi2knr.
499
Removed all global arrays (according to PNG_NO_GLOBAL_ARRAYS macro), to
500
accomodate making DLL's: Moved usr_png_ver from global variable to function
501
png_get_header_ver() in png.c. Moved png_sig to png_sig_bytes in png.c and
502
eliminated use of png_sig in pngwutil.c. Moved the various png_CHNK arrays
503
into pngtypes.h. Eliminated use of global png_pass arrays. Declared the
504
png_CHNK and png_pass arrays to be "const". Made the global arrays
505
available to applications (although none are used in libpng itself) when
506
PNG_NO_GLOBAL_ARRAYS is not defined or when PNG_GLOBAL_ARRAYS is defined.
507
Removed some extraneous "-I" from contrib/pngminus/makefile.std
508
Changed the PNG_sRGB_INTENT macros in png.h to be consistent with PNG-1.2.
509
Change PNG_SRGB_INTENT to PNG_sRGB_INTENT in libpng.txt and libpng.3
510
version 1.0.5d [November 29, 1999]
511
Add type cast (png_const_charp) two places in png.c
512
Eliminated pngtypes.h; use macros instead to declare PNG_CHNK arrays.
513
Renamed "PNG_GLOBAL_ARRAYS" to "PNG_USE_GLOBAL_ARRAYS" and made available
514
to applications a macro "PNG_USE_LOCAL_ARRAYS".
515
#ifdef out all the new declarations when PNG_USE_GLOBAL_ARRAYS is defined.
516
Added PNG_EXPORT_VAR macro to accommodate making DLL's.
517
version 1.0.5e [November 30, 1999]
518
Added iCCP, iTXt, and sPLT support; added "lang" member to the png_text
519
structure; refactored the inflate/deflate support to make adding new chunks
520
with trailing compressed parts easier in the future, and added new functions
521
png_free_iCCP, png_free_pCAL, png_free_sPLT, png_free_text, png_get_iCCP,
522
png_get_spalettes, png_set_iCCP, png_set_spalettes (Eric S. Raymond).
523
NOTE: Applications that write text chunks MUST define png_text->lang
524
before calling png_set_text(). It must be set to NULL if you want to
525
write tEXt or zTXt chunks. If you want your application to be able to
526
run with older versions of libpng, use
528
#ifdef PNG_iTXt_SUPPORTED
529
png_text[i].lang = NULL;
532
Changed png_get_oFFs() and png_set_oFFs() to use signed rather than unsigned
533
offsets (Eric S. Raymond).
534
Combined PNG_READ_cHNK_SUPPORTED and PNG_WRITE_cHNK_SUPPORTED macros into
535
PNG_cHNK_SUPPORTED and combined the three types of PNG_text_SUPPORTED
536
macros, leaving the separate macros also available.
537
Removed comments on #endifs at the end of many short, non-nested #if-blocks.
538
version 1.0.5f [December 6, 1999]
539
Changed makefile.solaris to issue a warning about potential problems when
540
the ucb "ld" is in the path ahead of the ccs "ld".
541
Removed "- [date]" from the "synopsis" line in libpng.3 and libpngpf.3.
542
Added sCAL chunk support (Eric S. Raymond).
543
version 1.0.5g [December 7, 1999]
544
Fixed "png_free_spallettes" typo in png.h
545
Added code to handle new chunks in pngpread.c
546
Moved PNG_CHNK string macro definitions outside of PNG_NO_EXTERN block
547
Added "translated_key" to png_text structure and png_write_iTXt().
548
Added code in pngwrite.c to work around a newly discovered zlib bug.
549
version 1.0.5h [December 10, 1999]
550
NOTE: regarding the note for version 1.0.5e, the following must also
551
be included in your code:
552
png_text[i].translated_key = NULL;
553
Unknown chunk handling is now supported.
554
Option to eliminate all floating point support was added. Some new
555
fixed-point functions such as png_set_gAMA_fixed() were added.
556
Expanded tabs and removed trailing blanks in source files.
557
version 1.0.5i [December 13, 1999]
558
Added some type casts to silence compiler warnings.
559
Renamed "png_free_spalette" to "png_free_spalettes" for consistency.
560
Removed leading blanks from a #define in pngvcrd.c
561
Added some parameters to the new png_set_keep_unknown_chunks() function.
562
Added a test for up->location != 0 in the first instance of writing
563
unknown chunks in pngwrite.c
564
Changed "num" to "i" in png_free_spalettes() and png_free_unknowns() to
566
Added png_free_hIST() function.
567
Various patches to fix bugs in the sCAL and integer cHRM processing,
568
and to add some convenience macros for use with sCAL.
569
version 1.0.5j [December 21, 1999]
570
Changed "unit" parameter of png_write_sCAL from png_byte to int, to work
571
around buggy compilers.
572
Added new type "png_fixed_point" for integers that hold float*100000 values
573
Restored backward compatibility of tEXt/zTXt chunk processing:
574
Restored the first four members of png_text to the same order as v.1.0.5d.
575
Added members "lang_key" and "itxt_length" to png_text struct. Set
576
text_length=0 when "text" contains iTXt data. Use the "compression"
577
member to distinguish among tEXt/zTXt/iTXt types. Added
578
PNG_ITXT_COMPRESSION_NONE (1) and PNG_ITXT_COMPRESSION_zTXt(2) macros.
579
The "Note" above, about backward incompatibility of libpng-1.0.5e, no
581
Fixed png_read|write_iTXt() to read|write parameters in the right order,
582
and to write the iTXt chunk after IDAT if it appears in the end_ptr.
583
Added pnggccrd.c, version of pngvcrd.c Intel assembler for gcc (Greg Roelofs)
584
Reversed the order of trying to write floating-point and fixed-point gAMA.
585
version 1.0.5k [December 27, 1999]
586
Added many parentheses, e.g., "if (a && b & c)" becomes "if (a && (b & c))"
587
Added png_handle_as_unknown() function (Glenn)
588
Added png_free_chunk_list() function and chunk_list and num_chunk_list members
590
Eliminated erroneous warnings about multiple sPLT chunks and sPLT-after-PLTE.
591
Fixed a libpng-1.0.5h bug in pngrutil.c that was issuing erroneous warnings
592
about ignoring incorrect gAMA with sRGB (gAMA was in fact not ignored)
593
Added png_free_tRNS(); png_set_tRNS() now malloc's its own trans array (ESR).
594
Define png_get_int_32 when oFFs chunk is supported as well as when pCAL is.
595
Changed type of proflen from png_int_32 to png_uint_32 in png_get_iCCP().
596
version 1.0.5l [January 1, 2000]
597
Added functions png_set_read_user_chunk_fn() and png_get_user_chunk_ptr()
598
for setting a callback function to handle unknown chunks and for
599
retrieving the associated user pointer (Glenn).
600
version 1.0.5m [January 7, 2000]
601
Added high-level functions png_read_png(), png_write_png(), png_free_pixels().
602
version 1.0.5n [January 9, 2000]
603
Added png_free_PLTE() function, and modified png_set_PLTE() to malloc its
604
own memory for info_ptr->palette. This makes it safe for the calling
605
application to free its copy of the palette any time after it calls
607
version 1.0.5o [January 20, 2000]
608
Cosmetic changes only (removed some trailing blanks and TABs)
609
version 1.0.5p [January 31, 2000]
610
Renamed pngdll.mak to makefile.bd32
611
Cosmetic changes in pngtest.c
612
version 1.0.5q [February 5, 2000]
613
Relocated the makefile.solaris warning about PATH problems.
614
Fixed pngvcrd.c bug by pushing/popping registers in mmxsupport (Bruce Oberg)
615
Revised makefile.gcmmx
616
Added PNG_SETJMP_SUPPORTED, PNG_SETJMP_NOT_SUPPORTED, and PNG_ABORT() macros
617
version 1.0.5r [February 7, 2000]
618
Removed superfluous prototype for png_get_itxt from png.h
619
Fixed a bug in pngrtran.c that improperly expanded the background color.
620
Return *num_text=0 from png_get_text() when appropriate, and fix documentation
621
of png_get_text() in libpng.txt/libpng.3.
622
version 1.0.5s [February 18, 2000]
623
Added "png_jmp_env()" macro to pngconf.h, to help people migrate to the
624
new error handler that's planned for the next libpng release, and changed
625
example.c, pngtest.c, and contrib programs to use this macro.
626
Revised some of the DLL-export macros in pngconf.h (Greg Roelofs)
627
Fixed a bug in png_read_png() that caused it to fail to expand some images
628
that it should have expanded.
629
Fixed some mistakes in the unused and undocumented INCH_CONVERSIONS functions
631
Changed the allocation of palette, history, and trans arrays back to
632
the version 1.0.5 method (linking instead of copying) which restores
633
backward compatibility with version 1.0.5. Added some remarks about
634
that in example.c. Added "free_me" member to info_ptr and png_ptr
635
and added png_free_data() function.
636
Updated makefile.linux and makefile.gccmmx to make directories conditionally.
637
Made cosmetic changes to pngasmrd.h
638
Added png_set_rows() and png_get_rows(), for use with png_read|write_png().
639
Modified png_read_png() to allocate info_ptr->row_pointers only if it
640
hasn't already been allocated.
641
version 1.0.5t [March 4, 2000]
642
Changed png_jmp_env() migration aiding macro to png_jmpbuf().
643
Fixed "interlace" typo (should be "interlaced") in contrib/gregbook/read2-x.c
644
Fixed bug with use of PNG_BEFORE_IHDR bit in png_ptr->mode, introduced when
645
PNG_FLAG_HAVE_CHUNK_HEADER was moved into png_ptr->mode in version 1.0.5b
646
Files in contrib/gregbook were revised to use png_jmpbuf() and to select
647
a 24-bit visual if one is available, and to allow abbreviated options.
648
Files in contrib/pngminus were revised to use the png_jmpbuf() macro.
649
Removed spaces in makefile.linux and makefile.gcmmx, introduced in 1.0.5s
650
version 1.0.5u [March 5, 2000]
651
Simplified the code that detects old png.h in png.c and pngtest.c
652
Renamed png_spalette (_p, _pp) to png_sPLT_t (_tp, _tpp)
653
Increased precision of rgb_to_gray calculations from 8 to 15 bits and
654
added png_set_rgb_to_gray_fixed() function.
655
Added makefile.bc32 (32-bit Borland C++, C mode)
656
version 1.0.5v [March 11, 2000]
657
Added some parentheses to the png_jmpbuf macro definition.
658
Updated references to the zlib home page, which has moved to freesoftware.com.
659
Corrected bugs in documentation regarding png_read_row() and png_write_row().
660
Updated documentation of png_rgb_to_gray calculations in libpng.3/libpng.txt.
661
Renamed makefile.borland,turboc3 back to makefile.bor,tc3 as in version 1.0.3,
662
revised borland makefiles; added makefile.ibmvac3 and makefile.gcc (Cosmin)
663
version 1.0.6 [March 20, 2000]
664
Minor revisions of makefile.bor, libpng.txt, and gregbook/rpng2-win.c
665
Added makefile.sggcc (SGI IRIX with gcc)
666
version 1.0.6d [April 7, 2000]
667
Changed sprintf() to strcpy() in png_write_sCAL_s() to work without STDIO
668
Added data_length parameter to png_decompress_chunk() function
669
Revised documentation to remove reference to abandoned png_free_chnk functions
670
Fixed an error in png_rgb_to_gray_fixed()
671
Revised example.c, usage of png_destroy_write_struct().
672
Renamed makefile.ibmvac3 to makefile.ibmc, added libpng.icc IBM project file
673
Added a check for info_ptr->free_me&PNG_FREE_TEXT when freeing text in png.c
674
Simplify png_sig_bytes() function to remove use of non-ISO-C strdup().
675
version 1.0.6e [April 9, 2000]
676
Added png_data_freer() function.
677
In the code that checks for over-length tRNS chunks, added check of
678
info_ptr->num_trans as well as png_ptr->num_trans (Matthias Benckmann)
679
Minor revisions of libpng.txt/libpng.3.
680
Check for existing data and free it if the free_me flag is set, in png_set_*()
682
Only define PNG_WEIGHTED_FILTERS_SUPPORTED when PNG_FLOATING_POINT_SUPPORTED
684
Changed several instances of PNG_NO_CONSOLE_ID to PNG_NO_STDIO in pngrutil.c
685
and mentioned the purposes of the two macros in libpng.txt/libpng.3.
686
version 1.0.6f [April 14, 2000]
687
Revised png_set_iCCP() and png_set_rows() to avoid prematurely freeing data.
688
Add checks in png_set_text() for NULL members of the input text structure.
689
Revised libpng.txt/libpng.3.
690
Removed superfluous prototype for png_set_itxt from png.h
691
Removed "else" from pngread.c, after png_error(), and changed "0" to "length".
692
Changed several png_errors about malformed ancillary chunks to png_warnings.
693
version 1.0.6g [April 24, 2000]
694
Added png_pass-* arrays to pnggccrd.c when PNG_USE_LOCAL_ARRAYS is defined.
695
Relocated paragraph about png_set_background() in libpng.3/libpng.txt
696
and other revisions (Matthias Benckmann)
697
Relocated info_ptr->free_me, png_ptr->free_me, and other info_ptr and
698
png_ptr members to restore binary compatibility with libpng-1.0.5
699
(breaks compatibility with libpng-1.0.6).
700
version 1.0.6h [April 24, 2000]
701
Changed shared library so-number pattern from 2.x.y.z to xy.z (this builds
702
libpng.so.10 & libpng.so.10.6h instead of libpng.so.2 & libpng.so.2.1.0.6h)
703
This is a temporary change for test purposes.
704
version 1.0.6i [May 2, 2000]
705
Rearranged some members at the end of png_info and png_struct, to put
706
unknown_chunks_num and free_me within the original size of the png_structs
707
and free_me, png_read_user_fn, and png_free_fn within the original png_info,
708
because some old applications allocate the structs directly instead of
709
using png_create_*().
710
Added documentation of user memory functions in libpng.txt/libpng.3
711
Modified png_read_png so that it will use user_allocated row_pointers
712
if present, unless free_me directs that it be freed, and added description
713
of the use of png_set_rows() and png_get_rows() in libpng.txt/libpng.3.
714
Added PNG_LEGACY_SUPPORTED macro, and #ifdef out all new (since version
715
1.00) members of png_struct and png_info, to regain binary compatibility
716
when you define this macro. Capabilities lost in this event
717
are user transforms (new in version 1.0.0),the user transform pointer
718
(new in version 1.0.2), rgb_to_gray (new in 1.0.5), iCCP, sCAL, sPLT,
719
the high-level interface, and unknown chunks support (all new in 1.0.6).
720
This was necessary because of old applications that allocate the structs
721
directly as authors were instructed to do in libpng-0.88 and earlier,
722
instead of using png_create_*().
723
Added modes PNG_CREATED_READ_STRUCT and PNG_CREATED_WRITE_STRUCT which
724
can be used to detect codes that directly allocate the structs, and
725
code to check these modes in png_read_init() and png_write_init() and
726
generate a libpng error if the modes aren't set and PNG_LEGACY_SUPPORTED
728
Added makefile.intel and updated makefile.watcom (Pawel Mrochen)
729
version 1.0.6j [May 3, 2000]
730
Overloaded png_read_init() and png_write_init() with macros that convert
731
calls to png_read_init_2() or png_write_init_2() that check the version
733
version 1.0.7beta11 [May 7, 2000]
734
Removed the new PNG_CREATED_READ_STRUCT and PNG_CREATED_WRITE_STRUCT modes
735
which are no longer used.
736
Eliminated the three new members of png_text when PNG_LEGACY_SUPPORTED is
737
defined or when neither PNG_READ_iTXt_SUPPORTED nor PNG_WRITE_iTXT_SUPPORTED
739
Made PNG_NO_READ|WRITE_iTXt the default setting, to avoid memory
740
overrun when old applications fill the info_ptr->text structure directly.
741
Added PNGAPI macro, and added it to the definitions of all exported functions.
742
Relocated version macro definitions ahead of the includes of zlib.h and
744
version 1.0.7beta12 [May 12, 2000]
745
Revised pngset.c to avoid a problem with expanding the png_debug macro.
746
Deleted some extraneous defines from pngconf.h
747
Made PNG_NO_CONSOLE_IO the default condition when PNG_BUILD_DLL is defined.
748
Use MSC _RPTn debugging instead of fprintf if _MSC_VER is defined.
749
Added png_access_version_number() function.
750
Check for mask&PNG_FREE_CHNK (for TEXT, SCAL, PCAL) in png_free_data().
751
Expanded libpng.3/libpng.txt information about png_data_freer().
752
version 1.0.7beta14 [May 17, 2000] (beta13 was not published)
753
Changed pnggccrd.c and pngvcrd.c to handle bad adaptive filter types as
754
warnings instead of errors, as pngrutil.c does.
755
Set the PNG_INFO_IDAT valid flag in png_set_rows() so png_write_png()
756
will actually write IDATs.
757
Made the default PNG_USE_LOCAL_ARRAYS depend on PNG_DLL instead of WIN32.
758
Make png_free_data() ignore its final parameter except when freeing data
759
that can have multiple instances (text, sPLT, unknowns).
760
Fixed a new bug in png_set_rows().
761
Removed info_ptr->valid tests from png_free_data(), as in version 1.0.5.
762
Added png_set_invalid() function.
763
Fixed incorrect illustrations of png_destroy_write_struct() in example.c.
764
version 1.0.7beta15 [May 30, 2000]
765
Revised the deliberately erroneous Linux setjmp code in pngconf.h to produce
766
fewer error messages.
767
Rearranged checks for Z_OK to check the most likely path first in pngpread.c
769
Added checks in pngtest.c for png_create_*() returning NULL, and mentioned
770
in libpng.txt/libpng.3 the need for applications to check this.
771
Changed names of png_default_*() functions in pngtest to pngtest_*().
772
Changed return type of png_get_x|y_offset_*() from png_uint_32 to png_int_32.
773
Fixed some bugs in the unused PNG_INCH_CONVERSIONS functions in pngget.c
774
Set each pointer to NULL after freeing it in png_free_data().
775
Worked around a problem in pngconf.h; AIX's strings.h defines an "index"
776
macro that conflicts with libpng's png_color_16.index. (Dimitri Papadapoulos)
777
Added "msvc" directory with MSVC++ project files (Simon-Pierre Cadieux).
778
version 1.0.7beta16 [June 4, 2000]
779
Revised the workaround of AIX string.h "index" bug.
780
Added a check for overlength PLTE chunk in pngrutil.c.
781
Added PNG_NO_POINTER_INDEXING macro to use array-indexing instead of pointer
782
indexing in pngrutil.c and pngwutil.c to accommodate a buggy compiler.
783
Added a warning in png_decompress_chunk() when it runs out of data, e.g.
784
when it tries to read an erroneous PhotoShop iCCP chunk.
785
Added PNG_USE_DLL macro.
786
Revised the copyright/disclaimer/license notice.
787
Added contrib/msvctest directory
788
version 1.0.7rc1 [June 9, 2000]
789
Corrected the definition of PNG_TRANSFORM_INVERT_ALPHA (0x0400 not 0x0200)
790
Added contrib/visupng directory (Willem van Schaik)
791
version 1.0.7beta18 [June 23, 2000]
792
Revised PNGAPI definition, and pngvcrd.c to work with __GCC__
793
and do not redefine PNGAPI if it is passed in via a compiler directive.
794
Revised visupng/PngFile.c to remove returns from within the Try block.
795
Removed leading underscores from "_PNG_H" and "_PNG_SAVE_BSD_SOURCE" macros.
796
Updated contrib/visupng/cexcept.h to version 1.0.0.
797
Fixed bugs in pngwrite.c and pngwutil.c that prevented writing iCCP chunks.
798
version 1.0.7rc2 [June 28, 2000]
799
Updated license to include disclaimers required by UCITA.
800
Fixed "DJBPP" typo in pnggccrd.c introduced in beta18.
801
version 1.0.7 [July 1, 2000]
802
Revised the definition of "trans_values" in libpng.3/libpng.txt
803
version 1.0.8beta1 [July 8, 2000]
804
Added png_free(png_ptr, key) two places in pngpread.c to stop memory leaks.
805
Changed PNG_NO_STDIO to PNG_NO_CONSOLE_IO, several places in pngrutil.c and
807
Changed PNG_EXPORT_VAR to use PNG_IMPEXP, in pngconf.h.
808
Removed unused "#include <assert.h>" from png.c
809
Added WindowsCE support.
810
Revised pnggccrd.c to work with gcc-2.95.2 and in the Cygwin environment.
811
version 1.0.8beta2 [July 10, 2000]
812
Added project files to the wince directory and made further revisions
813
of pngtest.c, pngrio.c, and pngwio.c in support of WindowsCE.
814
version 1.0.8beta3 [July 11, 2000]
815
Only set the PNG_FLAG_FREE_TRNS or PNG_FREE_TRNS flag in png_handle_tRNS()
816
for indexed-color input files to avoid potential double-freeing trans array
817
under some unusual conditions; problem was introduced in version 1.0.6f.
818
Further revisions to pngtest.c and files in the wince subdirectory.
819
version 1.0.8beta4 [July 14, 2000]
820
Added the files pngbar.png and pngbar.jpg to the distribution.
821
Added makefile.cygwin, and cygwin support in pngconf.h
822
Added PNG_NO_ZALLOC_ZERO macro (makes png_zalloc skip zeroing memory)
823
version 1.0.8rc1 [July 16, 2000]
824
Revised png_debug() macros and statements to eliminate compiler warnings.
825
version 1.0.8 [July 24, 2000]
826
Added png_flush() in pngwrite.c, after png_write_IEND().
827
Updated makefile.hpux to build a shared library.
828
version 1.0.9beta1 [November 10, 2000]
829
Fixed typo in scripts/makefile.hpux
830
Updated makevms.com in scripts and contrib/* and contrib/* (Martin Zinser)
831
Fixed seqence-point bug in contrib/pngminus/png2pnm (Martin Zinser)
832
Changed "cdrom.com" in documentation to "libpng.org"
833
Revised pnggccrd.c to get it all working, and updated makefile.gcmmx (Greg).
834
Changed type of "params" from voidp to png_voidp in png_read|write_png().
835
Make sure PNGAPI and PNG_IMPEXP are defined in pngconf.h.
836
Revised the 3 instances of WRITEFILE in pngtest.c.
837
Relocated "msvc" and "wince" project subdirectories into "dll" subdirectory.
838
Updated png.rc in dll/msvc project
839
Revised makefile.dec to define and use LIBPATH and INCPATH
840
Increased size of global png_libpng_ver[] array from 12 to 18 chars.
841
Made global png_libpng_ver[], png_sig[] and png_pass_*[] arrays const.
842
Removed duplicate png_crc_finish() from png_handle_bKGD() function.
843
Added a warning when application calls png_read_update_info() multiple times.
844
Revised makefile.cygwin
845
Fixed bugs in iCCP support in pngrutil.c and pngwutil.c.
846
Replaced png_set_empty_plte_permitted() with png_permit_mng_features().
847
version 1.0.9beta2 [November 19, 2000]
848
Renamed the "dll" subdirectory "projects".
849
Added borland project files to "projects" subdirectory.
850
Set VS_FF_PRERELEASE and VS_FF_PATCHED flags in msvc/png.rc when appropriate.
851
Add error message in png_set_compression_buffer_size() when malloc fails.
852
version 1.0.9beta3 [November 23, 2000]
853
Revised PNG_LIBPNG_BUILD_TYPE macro in png.h, used in the msvc project.
854
Removed the png_flush() in pngwrite.c that crashes some applications
855
that don't set png_output_flush_fn.
856
Added makefile.macosx and makefile.aix to scripts directory.
857
version 1.0.9beta4 [December 1, 2000]
858
Change png_chunk_warning to png_warning in png_check_keyword().
859
Increased the first part of msg buffer from 16 to 18 in png_chunk_error().
860
version 1.0.9beta5 [December 15, 2000]
861
Added support for filter method 64 (for PNG datastreams embedded in MNG).
862
version 1.0.9beta6 [December 18, 2000]
863
Revised png_set_filter() to accept filter method 64 when appropriate.
864
Added new PNG_HAVE_PNG_SIGNATURE bit to png_ptr->mode and use it to
865
help prevent applications from using MNG features in PNG datastreams.
866
Added png_permit_mng_features() function.
867
Revised libpng.3/libpng.txt. Changed "filter type" to "filter method".
868
version 1.0.9rc1 [December 23, 2000]
869
Revised test for PNG_HAVE_PNG_SIGNATURE in pngrutil.c
870
Fixed error handling of unknown compression type in png_decompress_chunk().
871
In pngconf.h, define __cdecl when _MSC_VER is defined.
872
version 1.0.9beta7 [December 28, 2000]
873
Changed PNG_TEXT_COMPRESSION_zTXt to PNG_COMPRESSION_TYPE_BASE several places.
874
Revised memory management in png_set_hIST and png_handle_hIST in a backward
875
compatible manner. PLTE and tRNS were revised similarly.
876
Revised the iCCP chunk reader to ignore trailing garbage.
877
version 1.0.9beta8 [January 12, 2001]
878
Moved pngasmrd.h into pngconf.h.
879
Improved handling of out-of-spec garbage iCCP chunks generated by PhotoShop.
880
version 1.0.9beta9 [January 15, 2001]
881
Added png_set_invalid, png_permit_mng_features, and png_mmx_supported to
882
wince and msvc project module definition files.
883
Minor revision of makefile.cygwin.
884
Fixed bug with progressive reading of narrow interlaced images in pngpread.c
885
version 1.0.9beta10 [January 16, 2001]
886
Do not typedef png_FILE_p in pngconf.h when PNG_NO_STDIO is defined.
887
Fixed "png_mmx_supported" typo in project definition files.
888
version 1.0.9beta11 [January 19, 2001]
889
Updated makefile.sgi to make shared library.
890
Removed png_mmx_support() function and disabled PNG_MNG_FEATURES_SUPPORTED
891
by default, for the benefit of DLL forward compatibility. These will
892
be re-enabled in version 1.2.0.
893
version 1.0.9rc2 [January 22, 2001]
894
Revised cygwin support.
895
version 1.0.9 [January 31, 2001]
896
Added check of cygwin's ALL_STATIC in pngconf.h
897
Added "-nommx" parameter to contrib/gregbook/rpng2-win and rpng2-x demos.
898
version 1.0.10beta1 [March 14, 2001]
899
Revised makefile.dec, makefile.sgi, and makefile.sggcc; added makefile.hpgcc.
900
Reformatted libpng.3 to eliminate bad line breaks.
901
Added checks for _mmx_supported in the read_filter_row function of pnggccrd.c
902
Added prototype for png_mmx_support() near the top of pnggccrd.c
903
Moved some error checking from png_handle_IHDR to png_set_IHDR.
904
Added PNG_NO_READ_SUPPORTED and PNG_NO_WRITE_SUPPORTED macros.
905
Revised png_mmx_support() function in pnggccrd.c
906
Restored version 1.0.8 PNG_WRITE_EMPTY_PLTE_SUPPORTED behavior in pngwutil.c
907
Fixed memory leak in contrib/visupng/PngFile.c
908
Fixed bugs in png_combine_row() in pnggccrd.c and pngvcrd.c (C version)
909
Added warnings when retrieving or setting gamma=0.
910
Increased the first part of msg buffer from 16 to 18 in png_chunk_warning().
911
version 1.0.10rc1 [March 23, 2001]
912
Changed all instances of memcpy, strcpy, and strlen to png_memcpy, png_strcpy,
914
Revised png_mmx_supported() function in pnggccrd.c to return proper value.
915
Fixed bug in progressive reading (pngpread.c) with small images (height < 8).
916
version 1.0.10 [March 30, 2001]
917
Deleted extraneous space (introduced in 1.0.9) from line 42 of makefile.cygwin
918
Added beos project files (Chris Herborth)
919
version 1.0.11beta1 [April 3, 2001]
920
Added type casts on several png_malloc() calls (Dimitri Papadapoulos).
921
Removed a no-longer needed AIX work-around from pngconf.h
922
Changed several "//" single-line comments to C-style in pnggccrd.c
923
version 1.0.11beta2 [April 11, 2001]
924
Removed PNGAPI from several functions whose prototypes did not have PNGAPI.
925
Updated scripts/pngos2.def
926
version 1.0.11beta3 [April 14, 2001]
927
Added checking the results of many instances of png_malloc() for NULL
928
version 1.0.11beta4 [April 20, 2001]
929
Undid the changes from version 1.0.11beta3. Added a check for NULL return
930
from user's malloc_fn().
931
Removed some useless type casts of the NULL pointer.
932
Added makefile.netbsd
933
version 1.0.11 [April 27, 2001]
934
Revised makefile.netbsd
935
version 1.0.12beta1 [May 14, 2001]
936
Test for Windows platform in pngconf.h when including malloc.h (Emmanuel Blot)
937
Updated makefile.cygwin and handling of Cygwin's ALL_STATIC in pngconf.h
938
Added some never-to-be-executed code in pnggccrd.c to quiet compiler warnings.
939
Eliminated the png_error about apps using png_read|write_init(). Instead,
940
libpng will reallocate the png_struct and info_struct if they are too small.
941
This retains future binary compatibility for old applications written for
942
libpng-0.88 and earlier.
943
version 1.2.0beta1 [May 6, 2001]
945
Re-enabled PNG_MNG_FEATURES_SUPPORTED and enabled PNG_ASSEMBLER_CODE_SUPPORTED
947
Added runtime selection of MMX features.
948
Added png_set_strip_error_numbers function and related macros.
949
version 1.2.0beta2 [May 7, 2001]
950
Finished merging 1.2.0beta1 with version 1.0.11
951
Added a check for attempts to read or write PLTE in grayscale PNG datastreams.
952
version 1.2.0beta3 [May 17, 2001]
953
Enabled user memory function by default.
954
Modified png_create_struct so it passes user mem_ptr to user memory allocator.
955
Increased png_mng_features flag from png_byte to png_uint_32.
956
Bumped shared-library (so-number) and dll-number to 3.
957
version 1.2.0beta4 [June 23, 2001]
958
Check for missing profile length field in iCCP chunk and free chunk_data
959
in case of truncated iCCP chunk.
960
Bumped shared-library number to 3 in makefile.sgi and makefile.sggcc
961
Bumped dll-number from 2 to 3 in makefile.cygwin
962
Revised contrib/gregbook/rpng*-x.c to avoid a memory leak and to exit cleanly
963
if user attempts to run it on an 8-bit display.
964
Updated contrib/gregbook
965
Use png_malloc instead of png_zalloc to allocate palette in pngset.c
966
Updated makefile.ibmc
967
Added some typecasts to eliminate gcc 3.0 warnings. Changed prototypes
968
of png_write_oFFS width and height from png_uint_32 to png_int_32.
970
Revised prototypes for png_debug_malloc and png_debug_free in pngtest.c
971
version 1.2.0beta5 [August 8, 2001]
972
Revised contrib/gregbook
973
Revised makefile.gcmmx
974
Revised pnggccrd.c to conditionally compile some thread-unsafe code only
975
when PNG_THREAD_UNSAFE_OK is defined.
976
Added tests to prevent pngwutil.c from writing a bKGD or tRNS chunk with
977
value exceeding 2^bit_depth-1
978
Revised makefile.sgi and makefile.sggcc
979
Replaced calls to fprintf(stderr,...) with png_warning() in pnggccrd.c
980
Removed restriction that do_invert_mono only operate on 1-bit opaque files
981
version 1.2.0 [September 1, 2001]
982
Changed a png_warning() to png_debug() in pnggccrd.c
983
Fixed contrib/gregbook/rpng-x.c, rpng2-x.c to avoid crash with XFreeGC().
984
version 1.2.1beta1 [October 19, 2001]
985
Revised makefile.std in contrib/pngminus
986
Include background_1 in png_struct regardless of gamma support.
987
Revised makefile.netbsd and makefile.macosx, added makefile.darwin.
988
Revised example.c to provide more details about using row_callback().
989
version 1.2.1beta2 [October 25, 2001]
990
Added type cast to each NULL appearing in a function call, except for
993
version 1.2.1beta3 [October 27, 2001]
994
Removed type casts from all NULLs.
995
Simplified png_create_struct_2().
996
version 1.2.1beta4 [November 7, 2001]
997
Revised png_create_info_struct() and png_creat_struct_2().
998
Added error message if png_write_info() was omitted.
999
Type cast NULLs appearing in function calls when _NO_PROTO or
1000
PNG_TYPECAST_NULL is defined.
1001
version 1.2.1rc1 [November 24, 2001]
1002
Type cast NULLs appearing in function calls except when PNG_NO_TYPECAST_NULL
1004
Changed typecast of "size" argument to png_size_t in pngmem.c calls to
1005
the user malloc_fn, to agree with the prototype in png.h
1006
Added a pop/push operation to pnggccrd.c, to preserve Eflag (Maxim Sobolev)
1007
Updated makefile.sgi to recognize LIBPATH and INCPATH.
1008
Updated various makefiles so "make clean" does not remove previous major
1009
version of the shared library.
1010
version 1.2.1rc2 [December 4, 2001]
1011
Always allocate 256-entry internal palette, hist, and trans arrays, to
1012
avoid out-of-bounds memory reference caused by invalid PNG datastreams.
1013
Added a check for prefix_length > data_length in iCCP chunk handler.
1014
version 1.2.1 [December 7, 2001]
1016
version 1.2.2beta1 [February 22, 2002]
1017
Fixed a bug with reading the length of iCCP profiles (Larry Reeves).
1018
Revised makefile.linux, makefile.gcmmx, and makefile.sgi to generate
1019
libpng.a, libpng12.so (not libpng.so.3), and libpng12/png.h
1020
Revised makefile.darwin to remove "-undefined suppress" option.
1021
Added checks for gamma and chromaticity values over 21474.83, which exceed
1022
the limit for PNG unsigned 32-bit integers when encoded.
1023
Revised calls to png_create_read_struct() and png_create_write_struct()
1024
for simpler debugging.
1025
Revised png_zalloc() so zlib handles errors (uses PNG_FLAG_MALLOC_NULL_MEM_OK)
1026
version 1.2.2beta2 [February 23, 2002]
1027
Check chunk_length and idat_size for invalid (over PNG_MAX_UINT) lengths.
1028
Check for invalid image dimensions in png_get_IHDR.
1029
Added missing "fi;" in the install target of the SGI makefiles.
1030
Added install-static to all makefiles that make shared libraries.
1031
Always do gamma compensation when image is partially transparent.
1032
version 1.2.2beta3 [March 7, 2002]
1033
Compute background.gray and background_1.gray even when color_type is RGB
1034
in case image gets reduced to gray later.
1035
Modified shared-library makefiles to install pkgconfig/libpngNN.pc.
1036
Export (with PNGAPI) png_zalloc, png_zfree, and png_handle_as_unknown
1037
Removed unused png_write_destroy_info prototype from png.h
1038
Eliminated incorrect use of width_mmx from pnggccrd.c in pixel_bytes == 8 case
1039
Added install-shared target to all makefiles that make shared libraries.
1040
Stopped a double free of palette, hist, and trans when not using free_me.
1041
Added makefile.32sunu for Sun Ultra 32 and makefile.64sunu for Sun Ultra 64.
1042
version 1.2.2beta4 [March 8, 2002]
1043
Compute background.gray and background_1.gray even when color_type is RGB
1044
in case image gets reduced to gray later (Jason Summers).
1045
Relocated a misplaced /bin/rm in the "install-shared" makefile targets
1046
Added PNG_1_0_X macro which can be used to build a 1.0.x-compatible library.
1047
version 1.2.2beta5 [March 26, 2002]
1048
Added missing PNGAPI to several function definitions.
1049
Check for invalid bit_depth or color_type in png_get_IHDR(), and
1050
check for missing PLTE or IHDR in png_push_read_chunk() (Matthias Clasen).
1051
Revised iTXt support to accept NULL for lang and lang_key.
1052
Compute gamma for color components of background even when color_type is gray.
1053
Changed "()" to "{}" in scripts/libpng.pc.in.
1054
Revised makefiles to put png.h and pngconf.h only in $prefix/include/libpngNN
1055
Revised makefiles to make symlink to libpng.so.NN in addition to libpngNN.so
1056
version 1.2.2beta6 [March 31, 2002]
1057
version 1.0.13beta1 [March 31, 2002]
1058
Prevent png_zalloc() from trying to memset memory that it failed to acquire.
1059
Add typecasts of PNG_MAX_UINT in pngset_cHRM_fixed() (Matt Holgate).
1060
Ensure that the right function (user or default) is used to free the
1061
png_struct after an error in png_create_read_struct_2().
1062
version 1.2.2rc1 [April 7, 2002]
1063
version 1.0.13rc1 [April 7, 2002]
1064
Save the ebx register in pnggccrd.c (Sami Farin)
1065
Add "mem_ptr = png_ptr->mem_ptr" in png_destroy_write_struct() (Paul Gardner).
1066
Updated makefiles to put headers in include/libpng and remove old include/*.h.
1067
version 1.2.2 [April 15, 2002]
1068
version 1.0.13 [April 15, 2002]
1069
Revised description of png_set_filter() in libpng.3/libpng.txt.
1070
Revised makefile.netbsd and added makefile.neNNbsd and makefile.freebsd
1071
version 1.0.13patch01 [April 17, 2002]
1072
version 1.2.2patch01 [April 17, 2002]
1073
Changed ${PNGMAJ}.${PNGVER} bug to ${PNGVER} in makefile.sgi and makefile.sggcc
1074
Fixed VER -> PNGVER typo in makefile.macosx and added install-static to install
1075
Added install: target to makefile.32sunu and makefile.64sunu
1076
version 1.0.13patch03 [April 18, 2002]
1077
version 1.2.2patch03 [April 18, 2002]
1078
Revised 15 makefiles to link libpng.a to libpngNN.a and the include libpng
1079
subdirectory to libpngNN subdirectory without the full pathname.
1080
Moved generation of libpng.pc from "install" to "all" in 15 makefiles.
1081
version 1.2.3rc1 [April 28, 2002]
1082
Added install-man target to 15 makefiles (Dimitri Papadopolous-Orfanos).
1083
Added $(DESTDIR) feature to 24 makefiles (Tim Mooney)
1084
Fixed bug with $prefix, should be $(prefix) in makefile.hpux.
1085
Updated cygwin-specific portion of pngconf.h and revised makefile.cygwin
1086
Added a link from libpngNN.pc to libpng.pc in 15 makefiles.
1087
Added links from include/libpngNN/*.h to include/*.h in 24 makefiles.
1088
Revised makefile.darwin to make relative links without full pathname.
1089
Added setjmp() at the end of png_create_*_struct_2() in case user forgets
1090
to put one in their application.
1091
Restored png_zalloc() and png_zfree() prototypes to version 1.2.1 and
1092
removed them from module definition files.
1093
version 1.2.3rc2 [May 1, 2002]
1094
Fixed bug in reporting number of channels in pngget.c and pngset.c,
1095
that was introduced in version 1.2.2beta5.
1096
Exported png_zalloc(), png_zfree(), png_default_read(), png_default_write(),
1097
png_default_flush(), and png_push_fill_buffer() and included them in
1098
module definition files.
1099
Added "libpng.pc" dependency to the "install-shared" target in 15 makefiles.
1100
version 1.2.3rc3 [May 1, 2002]
1101
Revised prototype for png_default_flush()
1102
Remove old libpng.pc and libpngNN.pc before installing new ones.
1103
version 1.2.3rc4 [May 2, 2002]
1104
Typos in *.def files (png_default_read|write -> png_default_read|write_data)
1105
In makefiles, changed rm libpng.NN.pc to rm libpngNN.pc
1106
Added libpng-config and libpngNN-config and modified makefiles to install them.
1107
Changed $(MANPATH) to $(DESTDIR)$(MANPATH) in makefiles
1108
Added "Win32 DLL VB" configuration to projects/msvc/libpng.dsp
1109
version 1.2.3rc5 [May 11, 2002]
1110
Changed "error" and "message" in prototypes to "error_message" and
1111
"warning_message" to avoid namespace conflict.
1112
Revised 15 makefiles to build libpng-config from libpng-config-*.in
1113
Once more restored png_zalloc and png_zfree to regular nonexported form.
1114
Restored png_default_read|write_data, png_default_flush, png_read_fill_buffer
1115
to nonexported form, but with PNGAPI, and removed them from module def files.
1116
version 1.2.3rc6 [May 14, 2002]
1117
Removed "PNGAPI" from png_zalloc() and png_zfree() in png.c
1118
Changed "Gz" to "Gd" in projects/msvc/libpng.dsp and zlib.dsp.
1119
Removed leftover libpng-config "sed" script from four makefiles.
1120
Revised libpng-config creating script in 16 makefiles.
1121
version 1.2.3 [May 22, 2002]
1122
Revised libpng-config target in makefile.cygwin.
1123
Removed description of png_set_mem_fn() from documentation.
1124
Revised makefile.freebsd.
1125
Minor cosmetic changes to 15 makefiles, e.g., $(DI) = $(DESTDIR)/$(INCDIR).
1126
Revised projects/msvc/README.txt
1127
Changed -lpng to -lpngNN in LDFLAGS in several makefiles.
1128
version 1.2.4beta1 [May 24, 2002]
1129
Added libpng.pc and libpng-config to "all:" target in 16 makefiles.
1130
Fixed bug in 16 makefiles: $(DESTDIR)/$(LIBPATH) to $(DESTDIR)$(LIBPATH)
1131
Added missing "\" before closing double quote in makefile.gcmmx.
1132
Plugged various memory leaks; added png_malloc_warn() and png_set_text_2()
1134
version 1.2.4beta2 [June 25, 2002]
1135
Plugged memory leak of png_ptr->current_text (Matt Holgate).
1136
Check for buffer overflow before reading CRC in pngpread.c (Warwick Allison)
1137
Added -soname to the loader flags in makefile.dec, makefile.sgi, and
1139
Added "test-installed" target to makefile.linux, makefile.gcmmx,
1140
makefile.sgi, and makefile.sggcc.
1141
version 1.2.4beta3 [June 28, 2002]
1142
Plugged memory leak of row_buf in pngtest.c when there is a png_error().
1143
Detect buffer overflow in pngpread.c when IDAT is corrupted with extra data.
1144
Added "test-installed" target to makefile.32sunu, makefile.64sunu,
1145
makefile.beos, makefile.darwin, makefile.dec, makefile.macosx,
1146
makefile.solaris, makefile.hpux, makefile.hpgcc, and makefile.so9.
1147
version 1.2.4rc1 and 1.0.14rc1 [July 2, 2002]
1148
Added "test-installed" target to makefile.cygwin and makefile.sco.
1149
Revised pnggccrd.c to be able to back out version 1.0.x via PNG_1_0_X macro.
1150
version 1.2.4 and 1.0.14 [July 8, 2002]
1151
Changed png_warning() to png_error() when width is too large to process.
1152
version 1.2.4patch01 [July 20, 2002]
1153
Revised makefile.cygwin to use DLL number 12 instead of 13.
1154
version 1.2.5beta1 [August 6, 2002]
1155
Added code to contrib/gregbook/readpng2.c to ignore unused chunks.
1156
Replaced toucan.png in contrib/gregbook (it has been corrupt since 1.0.11)
1157
Removed some stray *.o files from contrib/gregbook.
1158
Changed png_error() to png_warning() about "Too much data" in pngpread.c
1159
and about "Extra compressed data" in pngrutil.c.
1160
Prevent png_ptr->pass from exceeding 7 in png_push_finish_row().
1161
Updated makefile.hpgcc
1162
Updated png.c and pnggccrd.c handling of return from png_mmx_support()
1163
version 1.2.5beta2 [August 15, 2002]
1164
Only issue png_warning() about "Too much data" in pngpread.c when avail_in
1166
Updated makefiles to install a separate libpng.so.3 with its own rpath.
1167
version 1.2.5rc1 and 1.0.15rc1 [August 24, 2002]
1168
Revised makefiles to not remove previous minor versions of shared libraries.
1169
version 1.2.5rc2 and 1.0.15rc2 [September 16, 2002]
1170
Revised 13 makefiles to remove "-lz" and "-L$(ZLIBLIB)", etc., from shared
1171
library loader directive.
1172
Added missing "$OBJSDLL" line to makefile.gcmmx.
1173
Added missing "; fi" to makefile.32sunu.
1174
version 1.2.5rc3 and 1.0.15rc3 [September 18, 2002]
1175
Revised libpng-config script.
1176
version 1.2.5 and 1.0.15 [October 3, 2002]
1177
Revised makefile.macosx, makefile.darwin, makefile.hpgcc, and makefile.hpux,
1179
Relocated two misplaced PNGAPI lines in pngtest.c
1181
Send comments/corrections/commendations to
1182
png-implement@ccrc.wustl.edu or to randeg@alum.rpi.edu
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src/macosx/libpng/CHANGES
