blob: 01deeeff0ce5e1c8b7e4af94d1f4f36fd83f7885 [file] [log] [blame]
CHANGES - changes for libpng
version 0.1 [March 29, 1995]
initial work-in-progress release
version 0.2 [April 1, 1995]
added reader into png.h
fixed small problems in stub file
version 0.3 [April 8, 1995]
added pull reader
split up pngwrite.c to several files
added pnglib.txt
added example.c
cleaned up writer, adding a few new transformations
fixed some bugs in writer
interfaced with zlib 0.5
added K&R support
added check for 64 KB blocks for 16 bit machines
version 0.4 [April 26, 1995]
cleaned up code and commented code
simplified time handling into png_time
created png_color_16 and png_color_8 to handle color needs
cleaned up color type defines
fixed various bugs
made various names more consistent
interfaced with zlib 0.71
cleaned up zTXt reader and writer (using zlib's Reset functions)
split transformations into pngrtran.c and pngwtran.c
version 0.5 [April 30, 1995]
interfaced with zlib 0.8
fixed many reading and writing bugs
saved using 3 spaces instead of tabs
version 0.6 [May 1, 1995]
first beta release
added png_large_malloc() and png_large_free()
added png_size_t
cleaned up some compiler warnings
added png_start_read_image()
version 0.7 [June 24, 1995]
cleaned up lots of bugs
finished dithering and other stuff
added test program
changed name from pnglib to libpng
version 0.71 [June 26, 1995]
changed pngtest.png for zlib 0.93
fixed error in libpng.txt and example.c
version 0.8 [August 20, 1995]
cleaned up some bugs
added png_set_filler()
split up pngstub.c into pngmem.c, pngio.c, and pngerror.c
added #define's to remove unwanted code
moved png_info_init() to png.c
added old_size into png_realloc()
added functions to manually set filtering and compression info
changed compression parameters based on image type
optimized filter selection code
added version info
changed external functions passing floats to doubles (k&r problems?)
put all the configurable stuff in pngconf.h
enabled png_set_shift to work with paletted images on read
added png_read_update_info() - updates info structure with transformations
Version 0.81 [August, 1995]
incorporated Tim Wegner's medium model code (thanks, Tim)
Version 0.82 [September, 1995]
[unspecified changes]
Version 0.85 [December, 1995]
added more medium model code (almost everything's a far)
added i/o, error, and memory callback functions
fixed some bugs (16-bit, 4-bit interlaced, etc.)
added first run progressive reader (barely tested)
Version 0.86 [January, 1996]
fixed bugs
improved documentation
Version 0.87 [January, 1996]
fixed medium model bugs
fixed other bugs introduced in 0.85 and 0.86
added some minor documentation
Version 0.88 [January, 1996]
fixed progressive bugs
replaced tabs with spaces
cleaned up documentation
added callbacks for read/write and warning/error functions
Version 0.89 [June 5, 1996]
Added new initialization API to make libpng work better with shared libs
we now have png_create_read_struct(), png_create_write_struct(),
png_create_info_struct(), png_destroy_read_struct(), and
png_destroy_write_struct() instead of the separate calls to
malloc and png_read_init(), png_info_init(), and png_write_init()
Changed warning/error callback functions to fix bug - this means you
should use the new initialization API if you were using the old
png_set_message_fn() calls, and that the old API no longer exists
so that people are aware that they need to change their code
Changed filter selection API to allow selection of multiple filters
since it didn't work in previous versions of libpng anyways
Optimized filter selection code
Fixed png_set_background() to allow using an arbitrary RGB color for
paletted images
Fixed gamma and background correction for paletted images, so
png_correct_palette is not needed unless you are correcting an
external palette (you will need to #define PNG_CORRECT_PALETTE_SUPPORTED
in pngconf.h) - if nobody uses this, it may disappear in the future.
Fixed bug with Borland 64K memory allocation (Alexander Lehmann)
Fixed bug in interlace handling (Smarasderagd, I think)
Added more error checking for writing and image to reduce invalid files
Separated read and write functions so that they won't both be linked
into a binary when only reading or writing functionality is used
New pngtest image also has interlacing and zTXt
Updated documentation to reflect new API
Version 0.89c [June 17, 1996]
Bug fixes.
Version 0.90 [January, 1997]
Made CRC errors/warnings on critical and ancillary chunks configurable
libpng will use the zlib CRC routines by (compile-time) default
Changed DOS small/medium model memory support - needs zlib 1.04 (Tim Wegner)
Added external C++ wrapper statements to png.h (Gilles Dauphin)
Allow PNG file to be read when some or all of file signature has already
been read from the beginning of the stream. ****This affects the size
of info_struct and invalidates all programs that use a shared libpng****
Fixed png_filler() declarations
Fixed? background color conversions
Fixed order of error function pointers to match documentation
Current chunk name is now available in png_struct to reduce the number
of nearly identical error messages (will simplify multi-lingual
support when available)
Try to get ready for unknown-chunk callback functions:
- previously read critical chunks are flagged, so the chunk handling
routines can determine if the chunk is in the right place
- all chunk handling routines have the same prototypes, so we will
be able to handle all chunks via a callback mechanism
Try to fix Linux "setjmp" buffer size problems
Removed png_large_malloc, png_large_free, and png_realloc functions.
Version 0.95 [March, 1997]
Fixed bug in pngwutil.c allocating "up_row" twice and "avg_row" never
Fixed bug in PNG file signature compares when start != 0
Changed parameter type of png_set_filler(...filler...) from png_byte
to png_uint_32
Added test for MACOS to ensure that both math.h and fp.h are not #included
Added macros for libpng to be compiled as a Windows DLL (Andreas Kupries)
Added "packswap" transformation, which changes the endianness of
packed-pixel bytes (Kevin Bracey)
Added "strip_alpha" transformation, which removes the alpha channel of
input images without using it (not necessarily a good idea)
Added "swap_alpha" transformation, which puts the alpha channel in front
of the color bytes instead of after
Removed all implicit variable tests which assume NULL == 0 (I think)
Changed several variables to "png_size_t" to show 16/32-bit limitations
Added new pCAL chunk read/write support
Added experimental filter selection weighting (Greg Roelofs)
Removed old png_set_rgbx() and png_set_xrgb() functions that have been
obsolete for about 2 years now (use png_set_filler() instead)
Added macros to read 16- and 32-bit ints directly from buffer, to be
used only on those systems that support it (namely PowerPC and 680x0)
With some testing, this may become the default for MACOS/PPC systems.
Only calculate CRC on data if we are going to use it
Added macros for zTXt compression type PNG_zTXt_COMPRESSION_???
Added macros for simple libpng debugging output selectable at compile time
Removed PNG_READ_END_MODE in progressive reader (Smarasderagd)
More description of info_struct in libpng.txt and png.h
More instructions in example.c
More chunk types tested in pngtest.c
Renamed pngrcb.c to pngset.c, and all png_read_<chunk> functions to be
png_set_<chunk>. We now have corresponding png_get_<chunk>
functions in pngget.c to get information in info_ptr. This isolates
the application from the internal organization of png_info_struct
(good for shared library implementations).
Version 0.96 [May, 1997]
Fixed serious bug with < 8bpp images introduced in 0.95
Fixed 256-color transparency bug (Greg Roelofs)
Fixed up documentation (Greg Roelofs, Laszlo Nyul)
Fixed "error" in pngconf.h for Linux setjmp() behavior
Fixed DOS medium model support (Tim Wegner)
Fixed png_check_keyword() for case with error in static string text
Added read of CRC after IEND chunk for embedded PNGs (Laszlo Nyul)
Added typecasts to quiet compiler errors
Added more debugging info
Version 0.97 [January, 1998]
Removed PNG_USE_OWN_CRC capability
Relocated png_set_crc_action from pngrutil.c to pngrtran.c
Fixed typecasts of "new_key", etc. (Andreas Dilger)
Added RFC 1152 [sic] date support
Fixed bug in gamma handling of 4-bit grayscale
Added 2-bit grayscale gamma handling (Glenn R-P)
Added more typecasts. 65536L becomes (png_uint_32)65536L, etc. (Glenn R-P)
Minor corrections in libpng.txt
Added simple sRGB support (Glenn R-P)
Easier conditional compiling, e.g.,
all configurable options can be selected from command-line instead
of having to edit pngconf.h (Glenn R-P)
Fixed memory leak in pngwrite.c (free info_ptr->text) (Glenn R-P)
Added more conditions for png_do_background, to avoid changing
black pixels to background when a background is supplied and
no pixels are transparent
Repaired PNG_NO_STDIO behavior
Tested NODIV support and made it default behavior (Greg Roelofs)
Added "-m" option and PNGTEST_DEBUG_MEMORY to pngtest (John Bowler)
Regularized version numbering scheme and bumped shared-library major
version number to 2 to avoid problems with libpng 0.89 apps
(Greg Roelofs)
Version 0.98 [January, 1998]
Cleaned up some typos in libpng.txt and in code documentation
Fixed memory leaks in pCAL chunk processing (Glenn R-P and John Bowler)
Cosmetic change "display_gamma" to "screen_gamma" in pngrtran.c
Changed recommendation about file_gamma for PC images to .51 from .45,
in example.c and libpng.txt, added comments to distinguish between
screen_gamma, viewing_gamma, and display_gamma.
Changed all references to RFC1152 to read RFC1123 and changed the
Added png_invert_alpha capability (Glenn R-P -- suggestion by Jon Vincent)
Changed srgb_intent from png_byte to int to avoid compiler bugs
Version 0.99 [January 30, 1998]
Free info_ptr->text instead of end_info_ptr->text in pngread.c (John Bowler)
Fixed a longstanding "packswap" bug in pngtrans.c
Fixed some inconsistencies in pngconf.h that prevented compiling with
Fixed some typos and made other minor rearrangement of libpng.txt (Andreas)
Changed recommendation about file_gamma for PC images to .50 from .51 in
example.c and libpng.txt, and changed file_gamma for sRGB images to .45
Added a number of functions to access information from the png structure
png_get_image_height(), etc. (Glenn R-P, suggestion by Brad Pettit)
Added TARGET_MACOS similar to zlib-1.0.8
Define PNG_ALWAYS_EXTERN when __MWERKS__ && WIN32 are defined
Added type casting to all png_malloc() function calls
Version 0.99a [January 31, 1998]
Added type casts and parentheses to all returns that return a value.(Tim W.)
Version 0.99b [February 4, 1998]
Added type cast png_uint_32 on malloc function calls where needed.
Changed type of num_hist from png_uint_32 to int (same as num_palette).
Added checks for rowbytes overflow, in case png_size_t is less than 32 bits.
Renamed makefile.elf to makefile.lnx.
Version 0.99c [February 7, 1998]
More type casting. Removed erroneous overflow test in pngmem.c.
Added png_buffered_memcpy() and png_buffered_memset(), apply them to rowbytes.
Added UNIX manual pages libpng.3 (incorporating libpng.txt) and png.5.
Version 0.99d [February 11, 1998]
Renamed "far_to_near()" "png_far_to_near()"
Revised libpng.3
Version 99c "buffered" operations didn't work as intended. Replaced them
with png_memcpy_check() and png_memset_check().
Added many "if (png_ptr == NULL) return" to quell compiler warnings about
unused png_ptr, mostly in pngget.c and pngset.c.
Check for overlength tRNS chunk present when indexed-color PLTE is read.
Cleaned up spelling errors in libpng.3/libpng.txt
Corrected a problem with png_get_tRNS() which returned undefined trans array
Version 0.99e [February 28, 1998]
Corrected png_get_tRNS() again.
Add parentheses for easier reading of pngget.c, fixed "||" should be "&&".
Touched up example.c to make more of it compileable, although the entire
file still can't be compiled (Willem van Schaik)
Fixed a bug in png_do_shift() (Bryan Tsai)
Added a space in png.h prototype for png_write_chunk_start()
Replaced pngtest.png with one created with zlib 1.1.1
Changed pngtest to report PASS even when file size is different (Jean-loup G.)
Corrected some logic errors in png_do_invert_alpha() (Chris Patterson)
Version 0.99f [March 5, 1998]
Corrected a bug in pngpread() introduced in version 99c (Kevin Bracey)
Moved makefiles into a "scripts" directory, and added INSTALL instruction file
Added makefile.os2 and pngos2.def (A. Zabolotny) and makefile.s2x (W. Sebok)
Added pointers to "note on libpng versions" in makefile.lnx and README
Added row callback feature when reading and writing nonprogressive rows
and added a test of this feature in pngtest.c
Added user transform callbacks, with test of the feature in pngtest.c
Version 0.99g [March 6, 1998, morning]
Minor changes to pngtest.c to suppress compiler warnings.
Removed "beta" language from documentation.
Version 0.99h [March 6, 1998, evening]
Minor changes to previous minor changes to pngtest.c
Added user transform capability
Version 1.00 [March 7, 1998]
Changed several typedefs in pngrutil.c
Added makefile.wat (Pawel Mrochen), updated makefile.tc3 (Willem van Schaik)
Replaced "while(1)" with "for(;;)"
Added PNGARG() to prototypes in pngtest.c and removed some prototypes
Updated some of the makefiles (Tom Lane)
Changed some typedefs (s_start, etc.) in pngrutil.c
Fixed dimensions of "short_months" array in pngwrite.c
Replaced ansi2knr.c with the one from jpeg-v6
Version 1.0.0 [March 8, 1998]
Changed name from 1.00 to 1.0.0 (Adam Costello)
Added smakefile.ppc (with SCOPTIONS.ppc) for Amiga PPC (Andreas Kleinert)
Version 1.0.0a [March 9, 1998]
Fixed three bugs in pngrtran.c to make gamma+background handling consistent
(Greg Roelofs)
Changed format of the PNG_LIBPNG_VER integer to xyyzz instead of xyz
for major, minor, and bugfix releases. This is 10001. (Adam Costello,
Tom Lane)
Make months range from 1-12 in png_convert_to_rfc1123
Version 1.0.0b [March 13, 1998]
Quieted compiler complaints about two empty "for" loops in pngrutil.c
Minor changes to makefile.s2x
Removed #ifdef/#endif around a png_free() in pngread.c
Version 1.0.1 [March 14, 1998]
Changed makefile.s2x to reduce security risk of using a relative pathname
Fixed some typos in the documentation (Greg).
Fixed a problem with value of "channels" returned by png_read_update_info()
Version 1.0.1a [April 21, 1998]
Optimized Paeth calculations by replacing abs() function calls with intrinsics
plus other loop optimizations. Improves avg decoding speed by about 20%.
Commented out i386istic "align" compiler flags in makefile.lnx.
Reduced the default warning level in some makefiles, to make them consistent.
Removed references to IJG and JPEG in the ansi2knr.c copyright statement.
Fixed a bug in png_do_strip_filler with XXRRGGBB => RRGGBB transformation.
Added grayscale and 16-bit capability to png_do_read_filler().
Fixed a bug in pngset.c, introduced in version 0.99c, that sets rowbytes
too large when writing an image with bit_depth < 8 (Bob Dellaca).
Corrected some bugs in the experimental weighted filtering heuristics.
Moved a misplaced pngrutil code block that truncates tRNS if it has more
than num_palette entries -- test was done before num_palette was defined.
Fixed a png_convert_to_rfc1123() bug that converts day 31 to 0 (Steve Eddins).
Changed compiler flags in makefile.wat for better optimization
(Pawel Mrochen).
Version 1.0.1b [May 2, 1998]
Relocated png_do_gray_to_rgb() within png_do_read_transformations() (Greg).
Relocated the png_composite macros from pngrtran.c to png.h (Greg).
Added makefile.sco (contributed by Mike Hopkirk).
Fixed two bugs (missing definitions of "istop") introduced in libpng-1.0.1a.
Fixed a bug in pngrtran.c that would set channels=5 under some circumstances.
More work on the Paeth-filtering, achieving imperceptible speedup
(A Kleinert).
More work on loop optimization which may help when compiled with C++
Added warnings when people try to use transforms they've defined out.
Collapsed 4 "i" and "c" loops into single "i" loops in pngrtran and pngwtran.
Revised paragraph about png_set_expand() in libpng.txt and libpng.3 (Greg)
Version 1.0.1c [May 11, 1998]
Fixed a bug in pngrtran.c (introduced in libpng-1.0.1a) where the masks for
filler bytes should have been 0xff instead of 0xf.
Added max_pixel_depth=32 in pngrutil.c when using FILLER with palette images.
out of the PNG_WRITE_TRANSFORMS_NOT_SUPPORTED block of pngconf.h
Added "PNG_NO_WRITE_TRANSFORMS" etc., as alternatives for *_NOT_SUPPORTED,
for consistency, in pngconf.h
Added individual "ifndef PNG_NO_[CAPABILITY]" in pngconf.h to make it easier
to remove unwanted capabilities via the compile line
Made some corrections to grammar (which, it's) in documentation (Greg).
Corrected example.c, use of row_pointers in png_write_image().
Version 1.0.1d [May 24, 1998]
Corrected several statements that used side effects illegally in pngrutil.c
and pngtrans.c, that were introduced in version 1.0.1b
Revised png_read_rows() to avoid repeated if-testing for NULL (A Kleinert)
More corrections to example.c, use of row_pointers in png_write_image()
and png_read_rows().
Added pngdll.mak and pngdef.pas to scripts directory, contributed by
Bob Dellaca, to make a png32bd.dll with Borland C++ 4.5
Fixed error in example.c with png_set_text: num_text is 3, not 2 (Guido V.)
Changed several loops from count-down to count-up, for consistency.
Version 1.0.1e [June 6, 1998]
Revised libpng.txt and libpng.3 description of png_set_read|write_fn(), and
added warnings when people try to set png_read_fn and png_write_fn in
the same structure.
Added a test such that png_do_gamma will be done when num_trans==0
for truecolor images that have defined a background. This corrects an
error that was introduced in libpng-0.90 that can cause gamma processing
to be skipped.
Added tests in png.h to include "trans" and "trans_values" in structures
Add png_free(png_ptr->time_buffer) in png_destroy_read_struct()
Moved png_convert_to_rfc_1123() from pngwrite.c to png.c
Added capability for user-provided malloc_fn() and free_fn() functions,
and revised pngtest.c to demonstrate their use, replacing the
Added makefile.w32, for Microsoft C++ 4.0 and later (Tim Wegner).
Version 1.0.2 [June 14, 1998]
Fixed two bugs in makefile.bor .
Version 1.0.2a [December 30, 1998]
Replaced and extended code that was removed from png_set_filler() in 1.0.1a.
Fixed a bug in png_do_filler() that made it fail to write filler bytes in
the left-most pixel of each row (Kevin Bracey).
Changed "static pngcharp tIME_string" to "static char tIME_string[30]"
in pngtest.c (Duncan Simpson).
Fixed a bug in pngtest.c that caused pngtest to try to write a tIME chunk
even when no tIME chunk was present in the source file.
Fixed a problem in pngrutil.c: gray_to_rgb didn't always work with 16-bit.
Fixed a problem in png_read_push_finish_row(), which would not skip some
passes that it should skip, for images that are less than 3 pixels high.
Interchanged the order of calls to png_do_swap() and png_do_shift()
in pngwtran.c (John Cromer).
Added #ifdef PNG_DEBUG/#endif surrounding use of PNG_DEBUG in png.h .
Changed "bad adaptive filter type" from error to warning in pngrutil.c .
Fixed a documentation error about default filtering with 8-bit indexed-color.
Separated the PNG_NO_STDIO macro into PNG_NO_STDIO and PNG_NO_CONSOLE_IO
(L. Peter Deutsch).
Added png_set_rgb_to_gray() and png_get_rgb_to_gray_status() functions.
Added png_get_copyright() and png_get_header_version() functions.
Revised comments on png_set_progressive_read_fn() in libpng.txt and example.c
Added information about debugging in libpng.txt and libpng.3 .
Changed "ln -sf" to "ln -s -f" in makefile.s2x, makefile.lnx, and
Removed lines after Dynamic Dependencies" in .
Revised makefile.dec to make a shared library (Jeremie Petit).
Removed trailing blanks from all files.
Version 1.0.2a [January 6, 1999]
Removed misplaced #endif and #ifdef PNG_NO_EXTERN near the end of png.h
Added "if" tests to silence complaints about unused png_ptr in png.h and png.c
Changed "check_if_png" function in example.c to return true (nonzero) if PNG.
Changed libpng.txt to demonstrate png_sig_cmp() instead of png_check_sig()
which is obsolete.
Version 1.0.3 [January 14, 1999]
Added makefile.hux, for Hewlett Packard HPUX 10.20 and 11.00 (Jim Rice)
Added a statement of Y2K compliance in png.h, libpng.3, and Y2KINFO.
Version 1.0.3a [August 12, 1999]
Added check for PNG_READ_INTERLACE_SUPPORTED in pngread.c; issue a warning
if an attempt is made to read an interlaced image when it's not supported.
Added check if png_ptr->trans is defined before freeing it in pngread.c
Modified the Y2K statement to include versions back to version 0.71
Fixed a bug in the check for valid IHDR bit_depth/color_types in pngrutil.c
Modified makefile.wat (added -zp8 flag, ".symbolic", changed some comments)
Replaced leading blanks with tab characters in makefile.hux
Changed "" to "" in various documents.
Changed (float)red and (float)green to (double)red, (double)green
in png_set_rgb_to_gray() to avoid "promotion" problems in AIX.
Fixed a bug in pngconf.h that omitted <stdio.h> when PNG_DEBUG==0 (K Bracey).
Reformatted libpng.3 and libpngpf.3 with proper fonts (script by J. vanZandt).
Updated documentation to refer to the PNG-1.2 specification.
Removed ansi2knr.c and left pointers to the latest source for ansi2knr.c
in makefile.knr, INSTALL, and README (L. Peter Deutsch)
Fixed bugs in calculation of the length of rowbytes when adding alpha
channels to 16-bit images, in pngrtran.c (Chris Nokleberg)
Added function png_set_user_transform_info() to store user_transform_ptr,
user_depth, and user_channels into the png_struct, and a function
png_get_user_transform_ptr() to retrieve the pointer (Chris Nokleberg)
Added function png_set_empty_plte_permitted() to make libpng useable
in MNG applications.
Corrected the typedef for png_free_ptr in png.h (Jesse Jones).
Correct gamma with srgb is 45455 instead of 45000 in pngrutil.c, to be
consistent with PNG-1.2, and allow variance of 500 before complaining.
Added assembler code contributed by Intel in file pngvcrd.c and modified
makefile.w32 to use it (Nirav Chhatrapati, INTEL Corporation,
Gilles Vollant)
Changed "ln -s -f" to "ln -f -s" in the makefiles to make Solaris happy.
Added some aliases for png_set_expand() in pngrtran.c, namely
png_set_expand_PLTE(), png_set_expand_depth(), and png_set_expand_tRNS()
(Greg Roelofs, in "PNG: The Definitive Guide").
Added makefile.beo for BEOS on X86, contributed by Sander Stok.
Version 1.0.3b [August 26, 1999]
Replaced 2147483647L several places with PNG_MAX_UINT macro, defined in png.h
Changed leading blanks to tabs in all makefiles.
Define PNG_USE_PNGVCRD in makefile.w32, to get MMX assembler code.
Made alternate versions of png_set_expand() in pngrtran.c, namely
png_set_gray_1_2_4_to_8, png_set_palette_to_rgb, and png_set_tRNS_to_alpha
(Greg Roelofs, in "PNG: The Definitive Guide"). Deleted the 1.0.3a aliases.
Relocated start of 'extern "C"' block in png.h so it doesn't include pngconf.h
Revised calculation of num_blocks in pngmem.c to avoid a potentially
negative shift distance, whose results are undefined in the C language.
Added a check in pngset.c to prevent writing multiple tIME chunks.
Added a check in pngwrite.c to detect invalid small window_bits sizes.
Version 1.0.3d [September 4, 1999]
Fixed type casting of igamma in pngrutil.c
Added new png_expand functions to scripts/pngdef.pas and pngos2.def
Added a demo read_user_transform_fn that examines the row filters in pngtest.c
Version 1.0.4 [September 24, 1999, not distributed publicly]
Define PNG_ALWAYS_EXTERN in pngconf.h if __STDC__ is defined
Delete #define PNG_INTERNAL and include "png.h" from pngasmrd.h
Made several minor corrections to pngtest.c
Renamed the makefiles with longer but more user friendly extensions.
Copied the PNG copyright and license to a separate LICENSE file.
Revised documentation, png.h, and example.c to remove reference to
"viewing_gamma" which no longer appears in the PNG specification.
Revised pngvcrd.c to use MMX code for interlacing only on the final pass.
Updated pngvcrd.c to use the faster C filter algorithms from libpng-1.0.1a
Split makefile.win32vc into two versions, makefile.vcawin32 (uses MMX
assembler code) and makefile.vcwin32 (doesn't).
Added a CPU timing report to pngtest.c (enabled by defining PNGTEST_TIMING)
Added a copy of pngnow.png to the distribution.
Version 1.0.4a [September 25, 1999]
Increase max_pixel_depth in pngrutil.c if a user transform needs it.
Changed several division operations to right-shifts in pngvcrd.c
Version 1.0.4b [September 30, 1999]
Added parentheses in line 3732 of pngvcrd.c
Added a comment in makefile.linux warning about buggy -O3 in pgcc 2.95.1
Version 1.0.4c [October 1, 1999]
Added a "png_check_version" function in png.c and pngtest.c that will generate
a helpful compiler error if an old png.h is found in the search path.
Changed type of png_user_transform_depth|channels from int to png_byte.
Added "Libpng is OSI Certified Open Source Software" statement to png.h
Version 1.0.4d [October 6, 1999]
Changed 0.45 to 0.45455 in png_set_sRGB()
Removed unused PLTE entries from pngnow.png
Re-enabled some parts of pngvcrd.c (png_combine_row) that work properly.
Version 1.0.4e [October 10, 1999]
Fixed sign error in pngvcrd.c (Greg Roelofs)
Replaced some instances of memcpy with simple assignments in pngvcrd (GR-P)
Version 1.0.4f [October 15, 1999]
Surrounded example.c code with #if 0 .. #endif to prevent people from
inadvertently trying to compile it.
Changed png_get_header_version() from a function to a macro in png.h
Added type casting mostly in pngrtran.c and pngwtran.c
Removed some pointless "ptr = NULL" in pngmem.c
Added a "contrib" directory containing the source code from Greg's book.
Version 1.0.5 [October 15, 1999]
Minor editing of the INSTALL and README files.
Version 1.0.5a [October 23, 1999]
Added contrib/pngsuite and contrib/pngminus (Willem van Schaik)
Fixed a typo in the png_set_sRGB() function call in example.c (Jan Nijtmans)
Further optimization and bugfix of pngvcrd.c
Revised pngset.c so that it does not allocate or free memory in the user's
text_ptr structure. Instead, it makes its own copy.
Created separate write_end_info_struct in pngtest.c for a more severe test.
Added code in pngwrite.c to free info_ptr->text[i].key to stop a memory leak.
Version 1.0.5b [November 23, 1999]
PNG_FLAG_WROTE_tIME from flags to mode.
Added png_write_info_before_PLTE() function.
Fixed some typecasting in contrib/gregbook/*.c
Updated scripts/ and added to contrib/gregbook
and contrib/pngminus (Martin Zinser)
Version 1.0.5c [November 26, 1999]
Moved png_get_header_version from png.h to png.c, to accommodate ansi2knr.
Removed all global arrays (according to PNG_NO_GLOBAL_ARRAYS macro), to
accommodate making DLL's: Moved usr_png_ver from global variable to function
png_get_header_ver() in png.c. Moved png_sig to png_sig_bytes in png.c and
eliminated use of png_sig in pngwutil.c. Moved the various png_CHNK arrays
into pngtypes.h. Eliminated use of global png_pass arrays. Declared the
png_CHNK and png_pass arrays to be "const". Made the global arrays
available to applications (although none are used in libpng itself) when
PNG_NO_GLOBAL_ARRAYS is not defined or when PNG_GLOBAL_ARRAYS is defined.
Removed some extraneous "-I" from contrib/pngminus/makefile.std
Changed the PNG_sRGB_INTENT macros in png.h to be consistent with PNG-1.2.
Change PNG_SRGB_INTENT to PNG_sRGB_INTENT in libpng.txt and libpng.3
Version 1.0.5d [November 29, 1999]
Add type cast (png_const_charp) two places in png.c
Eliminated pngtypes.h; use macros instead to declare PNG_CHNK arrays.
Renamed "PNG_GLOBAL_ARRAYS" to "PNG_USE_GLOBAL_ARRAYS" and made available
to applications a macro "PNG_USE_LOCAL_ARRAYS".
comment out (with #ifdef) all the new declarations when
Added PNG_EXPORT_VAR macro to accommodate making DLL's.
Version 1.0.5e [November 30, 1999]
Added iCCP, iTXt, and sPLT support; added "lang" member to the png_text
structure; refactored the inflate/deflate support to make adding new chunks
with trailing compressed parts easier in the future, and added new functions
png_free_iCCP, png_free_pCAL, png_free_sPLT, png_free_text, png_get_iCCP,
png_get_spalettes, png_set_iCCP, png_set_spalettes (Eric S. Raymond).
NOTE: Applications that write text chunks MUST define png_text->lang
before calling png_set_text(). It must be set to NULL if you want to
write tEXt or zTXt chunks. If you want your application to be able to
run with older versions of libpng, use
png_text[i].lang = NULL;
Changed png_get_oFFs() and png_set_oFFs() to use signed rather than unsigned
offsets (Eric S. Raymond).
PNG_cHNK_SUPPORTED and combined the three types of PNG_text_SUPPORTED
macros, leaving the separate macros also available.
Removed comments on #endifs at the end of many short, non-nested #if-blocks.
Version 1.0.5f [December 6, 1999]
Changed makefile.solaris to issue a warning about potential problems when
the ucb "ld" is in the path ahead of the ccs "ld".
Removed "- [date]" from the "synopsis" line in libpng.3 and libpngpf.3.
Added sCAL chunk support (Eric S. Raymond).
Version 1.0.5g [December 7, 1999]
Fixed "png_free_spallettes" typo in png.h
Added code to handle new chunks in pngpread.c
Moved PNG_CHNK string macro definitions outside of PNG_NO_EXTERN block
Added "translated_key" to png_text structure and png_write_iTXt().
Added code in pngwrite.c to work around a newly discovered zlib bug.
Version 1.0.5h [December 10, 1999]
NOTE: regarding the note for version 1.0.5e, the following must also
be included in your code:
png_text[i].translated_key = NULL;
Unknown chunk handling is now supported.
Option to eliminate all floating point support was added. Some new
fixed-point functions such as png_set_gAMA_fixed() were added.
Expanded tabs and removed trailing blanks in source files.
Version 1.0.5i [December 13, 1999]
Added some type casts to silence compiler warnings.
Renamed "png_free_spalette" to "png_free_spalettes" for consistency.
Removed leading blanks from a #define in pngvcrd.c
Added some parameters to the new png_set_keep_unknown_chunks() function.
Added a test for up->location != 0 in the first instance of writing
unknown chunks in pngwrite.c
Changed "num" to "i" in png_free_spalettes() and png_free_unknowns() to
prevent recursion.
Added png_free_hIST() function.
Various patches to fix bugs in the sCAL and integer cHRM processing,
and to add some convenience macros for use with sCAL.
Version 1.0.5j [December 21, 1999]
Changed "unit" parameter of png_write_sCAL from png_byte to int, to work
around buggy compilers.
Added new type "png_fixed_point" for integers that hold float*100000 values
Restored backward compatibility of tEXt/zTXt chunk processing:
Restored the first four members of png_text to the same order as v.1.0.5d.
Added members "lang_key" and "itxt_length" to png_text struct. Set
text_length=0 when "text" contains iTXt data. Use the "compression"
member to distinguish among tEXt/zTXt/iTXt types. Added
The "Note" above, about backward incompatibility of libpng-1.0.5e, no
longer applies.
Fixed png_read|write_iTXt() to read|write parameters in the right order,
and to write the iTXt chunk after IDAT if it appears in the end_ptr.
Added pnggccrd.c, version of pngvcrd.c Intel assembler for gcc (Greg Roelofs)
Reversed the order of trying to write floating-point and fixed-point gAMA.
Version 1.0.5k [December 27, 1999]
Added many parentheses, e.g., "if (a && b & c)" becomes "if (a && (b & c))"
Added png_handle_as_unknown() function (Glenn)
Added png_free_chunk_list() function and chunk_list and num_chunk_list members
of png_ptr.
Eliminated erroneous warnings about multiple sPLT chunks and sPLT-after-PLTE.
Fixed a libpng-1.0.5h bug in pngrutil.c that was issuing erroneous warnings
about ignoring incorrect gAMA with sRGB (gAMA was in fact not ignored)
Added png_free_tRNS(); png_set_tRNS() now malloc's its own trans array (ESR).
Define png_get_int_32 when oFFs chunk is supported as well as when pCAL is.
Changed type of proflen from png_int_32 to png_uint_32 in png_get_iCCP().
Version 1.0.5l [January 1, 2000]
Added functions png_set_read_user_chunk_fn() and png_get_user_chunk_ptr()
for setting a callback function to handle unknown chunks and for
retrieving the associated user pointer (Glenn).
Version 1.0.5m [January 7, 2000]
Added high-level functions png_read_png(), png_write_png(), png_free_pixels().
Version 1.0.5n [January 9, 2000]
Added png_free_PLTE() function, and modified png_set_PLTE() to malloc its
own memory for info_ptr->palette. This makes it safe for the calling
application to free its copy of the palette any time after it calls
Version 1.0.5o [January 20, 2000]
Cosmetic changes only (removed some trailing blanks and TABs)
Version 1.0.5p [January 31, 2000]
Renamed pngdll.mak to makefile.bd32
Cosmetic changes in pngtest.c
Version 1.0.5q [February 5, 2000]
Relocated the makefile.solaris warning about PATH problems.
Fixed pngvcrd.c bug by pushing/popping registers in mmxsupport (Bruce Oberg)
Revised makefile.gcmmx
Version 1.0.5r [February 7, 2000]
Removed superfluous prototype for png_get_itxt from png.h
Fixed a bug in pngrtran.c that improperly expanded the background color.
Return *num_text=0 from png_get_text() when appropriate, and fix documentation
of png_get_text() in libpng.txt/libpng.3.
Version 1.0.5s [February 18, 2000]
Added "png_jmp_env()" macro to pngconf.h, to help people migrate to the
new error handler that's planned for the next libpng release, and changed
example.c, pngtest.c, and contrib programs to use this macro.
Revised some of the DLL-export macros in pngconf.h (Greg Roelofs)
Fixed a bug in png_read_png() that caused it to fail to expand some images
that it should have expanded.
Fixed some mistakes in the unused and undocumented INCH_CONVERSIONS functions
in pngget.c
Changed the allocation of palette, history, and trans arrays back to
the version 1.0.5 method (linking instead of copying) which restores
backward compatibility with version 1.0.5. Added some remarks about
that in example.c. Added "free_me" member to info_ptr and png_ptr
and added png_free_data() function.
Updated makefile.linux and makefile.gccmmx to make directories conditionally.
Made cosmetic changes to pngasmrd.h
Added png_set_rows() and png_get_rows(), for use with png_read|write_png().
Modified png_read_png() to allocate info_ptr->row_pointers only if it
hasn't already been allocated.
Version 1.0.5t [March 4, 2000]
Changed png_jmp_env() migration aiding macro to png_jmpbuf().
Fixed "interlace" typo (should be "interlaced") in contrib/gregbook/read2-x.c
Fixed bug with use of PNG_BEFORE_IHDR bit in png_ptr->mode, introduced when
PNG_FLAG_HAVE_CHUNK_HEADER was moved into png_ptr->mode in version 1.0.5b
Files in contrib/gregbook were revised to use png_jmpbuf() and to select
a 24-bit visual if one is available, and to allow abbreviated options.
Files in contrib/pngminus were revised to use the png_jmpbuf() macro.
Removed spaces in makefile.linux and makefile.gcmmx, introduced in 1.0.5s
Version 1.0.5u [March 5, 2000]
Simplified the code that detects old png.h in png.c and pngtest.c
Renamed png_spalette (_p, _pp) to png_sPLT_t (_tp, _tpp)
Increased precision of rgb_to_gray calculations from 8 to 15 bits and
added png_set_rgb_to_gray_fixed() function.
Added makefile.bc32 (32-bit Borland C++, C mode)
Version 1.0.5v [March 11, 2000]
Added some parentheses to the png_jmpbuf macro definition.
Updated references to the zlib home page, which has moved to
Corrected bugs in documentation regarding png_read_row() and png_write_row().
Updated documentation of png_rgb_to_gray calculations in libpng.3/libpng.txt.
Renamed makefile.borland,turboc3 back to makefile.bor,tc3 as in version 1.0.3,
revised borland makefiles; added makefile.ibmvac3 and makefile.gcc (Cosmin)
Version 1.0.6 [March 20, 2000]
Minor revisions of makefile.bor, libpng.txt, and gregbook/rpng2-win.c
Added makefile.sggcc (SGI IRIX with gcc)
Version 1.0.6d [April 7, 2000]
Changed sprintf() to strcpy() in png_write_sCAL_s() to work without STDIO
Added data_length parameter to png_decompress_chunk() function
Revised documentation to remove reference to abandoned png_free_chnk functions
Fixed an error in png_rgb_to_gray_fixed()
Revised example.c, usage of png_destroy_write_struct().
Renamed makefile.ibmvac3 to makefile.ibmc, added libpng.icc IBM project file
Added a check for info_ptr->free_me&PNG_FREE_TEXT when freeing text in png.c
Simplify png_sig_bytes() function to remove use of non-ISO-C strdup().
Version 1.0.6e [April 9, 2000]
Added png_data_freer() function.
In the code that checks for over-length tRNS chunks, added check of
info_ptr->num_trans as well as png_ptr->num_trans (Matthias Benckmann)
Minor revisions of libpng.txt/libpng.3.
Check for existing data and free it if the free_me flag is set, in png_set_*()
and png_handle_*().
is defined.
Changed several instances of PNG_NO_CONSOLE_ID to PNG_NO_STDIO in pngrutil.c
and mentioned the purposes of the two macros in libpng.txt/libpng.3.
Version 1.0.6f [April 14, 2000]
Revised png_set_iCCP() and png_set_rows() to avoid prematurely freeing data.
Add checks in png_set_text() for NULL members of the input text structure.
Revised libpng.txt/libpng.3.
Removed superfluous prototype for png_set_iTXt from png.h
Removed "else" from pngread.c, after png_error(), and changed "0" to "length".
Changed several png_errors about malformed ancillary chunks to png_warnings.
Version 1.0.6g [April 24, 2000]
Added png_pass-* arrays to pnggccrd.c when PNG_USE_LOCAL_ARRAYS is defined.
Relocated paragraph about png_set_background() in libpng.3/libpng.txt
and other revisions (Matthias Benckmann)
Relocated info_ptr->free_me, png_ptr->free_me, and other info_ptr and
png_ptr members to restore binary compatibility with libpng-1.0.5
(breaks compatibility with libpng-1.0.6).
Version 1.0.6h [April 24, 2000]
Changed shared library so-number pattern from 2.x.y.z to xy.z (this builds & instead of &
This is a temporary change for test purposes.
Version 1.0.6i [May 2, 2000]
Rearranged some members at the end of png_info and png_struct, to put
unknown_chunks_num and free_me within the original size of the png_structs
and free_me, png_read_user_fn, and png_free_fn within the original png_info,
because some old applications allocate the structs directly instead of
using png_create_*().
Added documentation of user memory functions in libpng.txt/libpng.3
Modified png_read_png so that it will use user_allocated row_pointers
if present, unless free_me directs that it be freed, and added description
of the use of png_set_rows() and png_get_rows() in libpng.txt/libpng.3.
Added PNG_LEGACY_SUPPORTED macro, and #ifdef out all new (since version
1.00) members of png_struct and png_info, to regain binary compatibility
when you define this macro. Capabilities lost in this event
are user transforms (new in version 1.0.0),the user transform pointer
(new in version 1.0.2), rgb_to_gray (new in 1.0.5), iCCP, sCAL, sPLT,
the high-level interface, and unknown chunks support (all new in 1.0.6).
This was necessary because of old applications that allocate the structs
directly as authors were instructed to do in libpng-0.88 and earlier,
instead of using png_create_*().
can be used to detect codes that directly allocate the structs, and
code to check these modes in png_read_init() and png_write_init() and
generate a libpng error if the modes aren't set and PNG_LEGACY_SUPPORTED
was not defined.
Added and updated makefile.watcom (Pawel Mrochen)
Version 1.0.6j [May 3, 2000]
Overloaded png_read_init() and png_write_init() with macros that convert
calls to png_read_init_2() or png_write_init_2() that check the version
and structure sizes.
Version 1.0.7beta11 [May 7, 2000]
which are no longer used.
Eliminated the three new members of png_text when PNG_LEGACY_SUPPORTED is
defined or when neither PNG_READ_iTXt_SUPPORTED nor PNG_WRITE_iTXt_SUPPORTED
is defined.
Made PNG_NO_READ|WRITE_iTXt the default setting, to avoid memory
overrun when old applications fill the info_ptr->text structure directly.
Added PNGAPI macro, and added it to the definitions of all exported functions.
Relocated version macro definitions ahead of the includes of zlib.h and
pngconf.h in png.h.
Version 1.0.7beta12 [May 12, 2000]
Revised pngset.c to avoid a problem with expanding the png_debug macro.
Deleted some extraneous defines from pngconf.h
Made PNG_NO_CONSOLE_IO the default condition when PNG_BUILD_DLL is defined.
Use MSC _RPTn debugging instead of fprintf if _MSC_VER is defined.
Added png_access_version_number() function.
Check for mask&PNG_FREE_CHNK (for TEXT, SCAL, PCAL) in png_free_data().
Expanded libpng.3/libpng.txt information about png_data_freer().
Version 1.0.7beta14 [May 17, 2000] (beta13 was not published)
Changed pnggccrd.c and pngvcrd.c to handle bad adaptive filter types as
warnings instead of errors, as pngrutil.c does.
Set the PNG_INFO_IDAT valid flag in png_set_rows() so png_write_png()
will actually write IDATs.
Made the default PNG_USE_LOCAL_ARRAYS depend on PNG_DLL instead of WIN32.
Make png_free_data() ignore its final parameter except when freeing data
that can have multiple instances (text, sPLT, unknowns).
Fixed a new bug in png_set_rows().
Removed info_ptr->valid tests from png_free_data(), as in version 1.0.5.
Added png_set_invalid() function.
Fixed incorrect illustrations of png_destroy_write_struct() in example.c.
Version 1.0.7beta15 [May 30, 2000]
Revised the deliberately erroneous Linux setjmp code in pngconf.h to produce
fewer error messages.
Rearranged checks for Z_OK to check the most likely path first in pngpread.c
and pngwutil.c.
Added checks in pngtest.c for png_create_*() returning NULL, and mentioned
in libpng.txt/libpng.3 the need for applications to check this.
Changed names of png_default_*() functions in pngtest to pngtest_*().
Changed return type of png_get_x|y_offset_*() from png_uint_32 to png_int_32.
Fixed some bugs in the unused PNG_INCH_CONVERSIONS functions in pngget.c
Set each pointer to NULL after freeing it in png_free_data().
Worked around a problem in pngconf.h; AIX's strings.h defines an "index"
macro that conflicts with libpng's png_color_16.index. (Dimitri
Added "msvc" directory with MSVC++ project files (Simon-Pierre Cadieux).
Version 1.0.7beta16 [June 4, 2000]
Revised the workaround of AIX string.h "index" bug.
Added a check for overlength PLTE chunk in pngrutil.c.
Added PNG_NO_POINTER_INDEXING macro to use array-indexing instead of pointer
indexing in pngrutil.c and pngwutil.c to accommodate a buggy compiler.
Added a warning in png_decompress_chunk() when it runs out of data, e.g.
when it tries to read an erroneous PhotoShop iCCP chunk.
Added PNG_USE_DLL macro.
Revised the copyright/disclaimer/license notice.
Added contrib/msvctest directory
Version 1.0.7rc1 [June 9, 2000]
Corrected the definition of PNG_TRANSFORM_INVERT_ALPHA (0x0400 not 0x0200)
Added contrib/visupng directory (Willem van Schaik)
Version 1.0.7beta18 [June 23, 2000]
Revised PNGAPI definition, and pngvcrd.c to work with __GCC__
and do not redefine PNGAPI if it is passed in via a compiler directive.
Revised visupng/PngFile.c to remove returns from within the Try block.
Removed leading underscores from "_PNG_H" and "_PNG_SAVE_BSD_SOURCE" macros.
Updated contrib/visupng/cexcept.h to version 1.0.0.
Fixed bugs in pngwrite.c and pngwutil.c that prevented writing iCCP chunks.
Version 1.0.7rc2 [June 28, 2000]
Updated license to include disclaimers required by UCITA.
Fixed "DJBPP" typo in pnggccrd.c introduced in beta18.
Version 1.0.7 [July 1, 2000]
Revised the definition of "trans_values" in libpng.3/libpng.txt
Version 1.0.8beta1 [July 8, 2000]
Added png_free(png_ptr, key) two places in pngpread.c to stop memory leaks.
Changed PNG_NO_STDIO to PNG_NO_CONSOLE_IO, several places in pngrutil.c and
Changed PNG_EXPORT_VAR to use PNG_IMPEXP, in pngconf.h.
Removed unused "#include <assert.h>" from png.c
Added WindowsCE support.
Revised pnggccrd.c to work with gcc-2.95.2 and in the Cygwin environment.
Version 1.0.8beta2 [July 10, 2000]
Added project files to the wince directory and made further revisions
of pngtest.c, pngrio.c, and pngwio.c in support of WindowsCE.
Version 1.0.8beta3 [July 11, 2000]
Only set the PNG_FLAG_FREE_TRNS or PNG_FREE_TRNS flag in png_handle_tRNS()
for indexed-color input files to avoid potential double-freeing trans array
under some unusual conditions; problem was introduced in version 1.0.6f.
Further revisions to pngtest.c and files in the wince subdirectory.
Version 1.0.8beta4 [July 14, 2000]
Added the files pngbar.png and pngbar.jpg to the distribution.
Added makefile.cygwin, and cygwin support in pngconf.h
Added PNG_NO_ZALLOC_ZERO macro (makes png_zalloc skip zeroing memory)
Version 1.0.8rc1 [July 16, 2000]
Revised png_debug() macros and statements to eliminate compiler warnings.
Version 1.0.8 [July 24, 2000]
Added png_flush() in pngwrite.c, after png_write_IEND().
Updated makefile.hpux to build a shared library.
Version 1.0.9beta1 [November 10, 2000]
Fixed typo in scripts/makefile.hpux
Updated in scripts and contrib/* and contrib/* (Martin Zinser)
Fixed seqence-point bug in contrib/pngminus/png2pnm (Martin Zinser)
Changed "" in documentation to ""
Revised pnggccrd.c to get it all working, and updated makefile.gcmmx (Greg).
Changed type of "params" from voidp to png_voidp in png_read|write_png().
Make sure PNGAPI and PNG_IMPEXP are defined in pngconf.h.
Revised the 3 instances of WRITEFILE in pngtest.c.
Relocated "msvc" and "wince" project subdirectories into "dll" subdirectory.
Updated png.rc in dll/msvc project
Revised makefile.dec to define and use LIBPATH and INCPATH
Increased size of global png_libpng_ver[] array from 12 to 18 chars.
Made global png_libpng_ver[], png_sig[] and png_pass_*[] arrays const.
Removed duplicate png_crc_finish() from png_handle_bKGD() function.
Added a warning when application calls png_read_update_info() multiple times.
Revised makefile.cygwin
Fixed bugs in iCCP support in pngrutil.c and pngwutil.c.
Replaced png_set_empty_plte_permitted() with png_permit_mng_features().
Version 1.0.9beta2 [November 19, 2000]
Renamed the "dll" subdirectory "projects".
Added borland project files to "projects" subdirectory.
Set VS_FF_PRERELEASE and VS_FF_PATCHED flags in msvc/png.rc when appropriate.
Add error message in png_set_compression_buffer_size() when malloc fails.
Version 1.0.9beta3 [November 23, 2000]
Revised PNG_LIBPNG_BUILD_TYPE macro in png.h, used in the msvc project.
Removed the png_flush() in pngwrite.c that crashes some applications
that don't set png_output_flush_fn.
Added makefile.macosx and makefile.aix to scripts directory.
Version 1.0.9beta4 [December 1, 2000]
Change png_chunk_warning to png_warning in png_check_keyword().
Increased the first part of msg buffer from 16 to 18 in png_chunk_error().
Version 1.0.9beta5 [December 15, 2000]
Added support for filter method 64 (for PNG datastreams embedded in MNG).
Version 1.0.9beta6 [December 18, 2000]
Revised png_set_filter() to accept filter method 64 when appropriate.
Added new PNG_HAVE_PNG_SIGNATURE bit to png_ptr->mode and use it to
help prevent applications from using MNG features in PNG datastreams.
Added png_permit_mng_features() function.
Revised libpng.3/libpng.txt. Changed "filter type" to "filter method".
Version 1.0.9rc1 [December 23, 2000]
Revised test for PNG_HAVE_PNG_SIGNATURE in pngrutil.c
Fixed error handling of unknown compression type in png_decompress_chunk().
In pngconf.h, define __cdecl when _MSC_VER is defined.
Version 1.0.9beta7 [December 28, 2000]
Revised memory management in png_set_hIST and png_handle_hIST in a backward
compatible manner. PLTE and tRNS were revised similarly.
Revised the iCCP chunk reader to ignore trailing garbage.
Version 1.0.9beta8 [January 12, 2001]
Moved pngasmrd.h into pngconf.h.
Improved handling of out-of-spec garbage iCCP chunks generated by PhotoShop.
Version 1.0.9beta9 [January 15, 2001]
Added png_set_invalid, png_permit_mng_features, and png_mmx_supported to
wince and msvc project module definition files.
Minor revision of makefile.cygwin.
Fixed bug with progressive reading of narrow interlaced images in pngpread.c
Version 1.0.9beta10 [January 16, 2001]
Do not typedef png_FILE_p in pngconf.h when PNG_NO_STDIO is defined.
Fixed "png_mmx_supported" typo in project definition files.
Version 1.0.9beta11 [January 19, 2001]
Updated makefile.sgi to make shared library.
Removed png_mmx_support() function and disabled PNG_MNG_FEATURES_SUPPORTED
by default, for the benefit of DLL forward compatibility. These will
be re-enabled in version 1.2.0.
Version 1.0.9rc2 [January 22, 2001]
Revised cygwin support.
Version 1.0.9 [January 31, 2001]
Added check of cygwin's ALL_STATIC in pngconf.h
Added "-nommx" parameter to contrib/gregbook/rpng2-win and rpng2-x demos.
Version 1.0.10beta1 [March 14, 2001]
Revised makefile.dec, makefile.sgi, and makefile.sggcc; added makefile.hpgcc.
Reformatted libpng.3 to eliminate bad line breaks.
Added checks for _mmx_supported in the read_filter_row function of pnggccrd.c
Added prototype for png_mmx_support() near the top of pnggccrd.c
Moved some error checking from png_handle_IHDR to png_set_IHDR.
Revised png_mmx_support() function in pnggccrd.c
Restored version 1.0.8 PNG_WRITE_EMPTY_PLTE_SUPPORTED behavior in pngwutil.c
Fixed memory leak in contrib/visupng/PngFile.c
Fixed bugs in png_combine_row() in pnggccrd.c and pngvcrd.c (C version)
Added warnings when retrieving or setting gamma=0.
Increased the first part of msg buffer from 16 to 18 in png_chunk_warning().
Version 1.0.10rc1 [March 23, 2001]
Changed all instances of memcpy, strcpy, and strlen to png_memcpy, png_strcpy,
and png_strlen.
Revised png_mmx_supported() function in pnggccrd.c to return proper value.
Fixed bug in progressive reading (pngpread.c) with small images (height < 8).
Version 1.0.10 [March 30, 2001]
Deleted extraneous space (introduced in 1.0.9) from line 42 of makefile.cygwin
Added beos project files (Chris Herborth)
Version 1.0.11beta1 [April 3, 2001]
Added type casts on several png_malloc() calls (Dimitri Papadapoulos).
Removed a no-longer needed AIX work-around from pngconf.h
Changed several "//" single-line comments to C-style in pnggccrd.c
Version 1.0.11beta2 [April 11, 2001]
Removed PNGAPI from several functions whose prototypes did not have PNGAPI.
Updated scripts/pngos2.def
Version 1.0.11beta3 [April 14, 2001]
Added checking the results of many instances of png_malloc() for NULL
Version 1.0.11beta4 [April 20, 2001]
Undid the changes from version 1.0.11beta3. Added a check for NULL return
from user's malloc_fn().
Removed some useless type casts of the NULL pointer.
Added makefile.netbsd
Version 1.0.11 [April 27, 2001]
Revised makefile.netbsd
Version 1.0.12beta1 [May 14, 2001]
Test for Windows platform in pngconf.h when including malloc.h (Emmanuel Blot)
Updated makefile.cygwin and handling of Cygwin's ALL_STATIC in pngconf.h
Added some never-to-be-executed code in pnggccrd.c to quiet compiler warnings.
Eliminated the png_error about apps using png_read|write_init(). Instead,
libpng will reallocate the png_struct and info_struct if they are too small.
This retains future binary compatibility for old applications written for
libpng-0.88 and earlier.
Version 1.2.0beta1 [May 6, 2001]
Bumped DLLNUM to 2.
by default.
Added runtime selection of MMX features.
Added png_set_strip_error_numbers function and related macros.
Version 1.2.0beta2 [May 7, 2001]
Finished merging 1.2.0beta1 with version 1.0.11
Added a check for attempts to read or write PLTE in grayscale PNG datastreams.
Version 1.2.0beta3 [May 17, 2001]
Enabled user memory function by default.
Modified png_create_struct so it passes user mem_ptr to user memory allocator.
Increased png_mng_features flag from png_byte to png_uint_32.
Bumped shared-library (so-number) and dll-number to 3.
Version 1.2.0beta4 [June 23, 2001]
Check for missing profile length field in iCCP chunk and free chunk_data
in case of truncated iCCP chunk.
Bumped shared-library number to 3 in makefile.sgi and makefile.sggcc
Bumped dll-number from 2 to 3 in makefile.cygwin
Revised contrib/gregbook/rpng*-x.c to avoid a memory leak and to exit cleanly
if user attempts to run it on an 8-bit display.
Updated contrib/gregbook
Use png_malloc instead of png_zalloc to allocate palette in pngset.c
Updated makefile.ibmc
Added some typecasts to eliminate gcc 3.0 warnings. Changed prototypes
of png_write_oFFS width and height from png_uint_32 to png_int_32.
Updated example.c
Revised prototypes for png_debug_malloc and png_debug_free in pngtest.c
Version 1.2.0beta5 [August 8, 2001]
Revised contrib/gregbook
Revised makefile.gcmmx
Revised pnggccrd.c to conditionally compile some thread-unsafe code only
when PNG_THREAD_UNSAFE_OK is defined.
Added tests to prevent pngwutil.c from writing a bKGD or tRNS chunk with
value exceeding 2^bit_depth-1
Revised makefile.sgi and makefile.sggcc
Replaced calls to fprintf(stderr,...) with png_warning() in pnggccrd.c
Removed restriction that do_invert_mono only operate on 1-bit opaque files
Version 1.2.0 [September 1, 2001]
Changed a png_warning() to png_debug() in pnggccrd.c
Fixed contrib/gregbook/rpng-x.c, rpng2-x.c to avoid crash with XFreeGC().
Version 1.2.1beta1 [October 19, 2001]
Revised makefile.std in contrib/pngminus
Include background_1 in png_struct regardless of gamma support.
Revised makefile.netbsd and makefile.macosx, added makefile.darwin.
Revised example.c to provide more details about using row_callback().
Version 1.2.1beta2 [October 25, 2001]
Added type cast to each NULL appearing in a function call, except for
WINCE functions.
Added makefile.so9.
Version 1.2.1beta3 [October 27, 2001]
Removed type casts from all NULLs.
Simplified png_create_struct_2().
Version 1.2.1beta4 [November 7, 2001]
Revised png_create_info_struct() and png_creat_struct_2().
Added error message if png_write_info() was omitted.
Type cast NULLs appearing in function calls when _NO_PROTO or
Version 1.2.1rc1 [November 24, 2001]
Type cast NULLs appearing in function calls except when PNG_NO_TYPECAST_NULL
is defined.
Changed typecast of "size" argument to png_size_t in pngmem.c calls to
the user malloc_fn, to agree with the prototype in png.h
Added a pop/push operation to pnggccrd.c, to preserve Eflag (Maxim Sobolev)
Updated makefile.sgi to recognize LIBPATH and INCPATH.
Updated various makefiles so "make clean" does not remove previous major
version of the shared library.
Version 1.2.1rc2 [December 4, 2001]
Always allocate 256-entry internal palette, hist, and trans arrays, to
avoid out-of-bounds memory reference caused by invalid PNG datastreams.
Added a check for prefix_length > data_length in iCCP chunk handler.
Version 1.2.1 [December 7, 2001]
Version 1.2.2beta1 [February 22, 2002]
Fixed a bug with reading the length of iCCP profiles (Larry Reeves).
Revised makefile.linux, makefile.gcmmx, and makefile.sgi to generate
libpng.a, (not, and libpng12/png.h
Revised makefile.darwin to remove "-undefined suppress" option.
Added checks for gamma and chromaticity values over 21474.83, which exceed
the limit for PNG unsigned 32-bit integers when encoded.
Revised calls to png_create_read_struct() and png_create_write_struct()
for simpler debugging.
Revised png_zalloc() so zlib handles errors (uses PNG_FLAG_MALLOC_NULL_MEM_OK)
Version 1.2.2beta2 [February 23, 2002]
Check chunk_length and idat_size for invalid (over PNG_MAX_UINT) lengths.
Check for invalid image dimensions in png_get_IHDR.
Added missing "fi;" in the install target of the SGI makefiles.
Added install-static to all makefiles that make shared libraries.
Always do gamma compensation when image is partially transparent.
Version 1.2.2beta3 [March 7, 2002]
Compute background.gray and background_1.gray even when color_type is RGB
in case image gets reduced to gray later.
Modified shared-library makefiles to install pkgconfig/libpngNN.pc.
Export (with PNGAPI) png_zalloc, png_zfree, and png_handle_as_unknown
Removed unused png_write_destroy_info prototype from png.h
Eliminated incorrect use of width_mmx from pnggccrd.c in pixel_bytes == 8 case
Added install-shared target to all makefiles that make shared libraries.
Stopped a double free of palette, hist, and trans when not using free_me.
Added makefile.32sunu for Sun Ultra 32 and makefile.64sunu for Sun Ultra 64.
Version 1.2.2beta4 [March 8, 2002]
Compute background.gray and background_1.gray even when color_type is RGB
in case image gets reduced to gray later (Jason Summers).
Relocated a misplaced /bin/rm in the "install-shared" makefile targets
Added PNG_1_0_X macro which can be used to build a 1.0.x-compatible library.
Version 1.2.2beta5 [March 26, 2002]
Added missing PNGAPI to several function definitions.
Check for invalid bit_depth or color_type in png_get_IHDR(), and
check for missing PLTE or IHDR in png_push_read_chunk() (Matthias Clasen).
Revised iTXt support to accept NULL for lang and lang_key.
Compute gamma for color components of background even when color_type is gray.
Changed "()" to "{}" in scripts/
Revised makefiles to put png.h and pngconf.h only in $prefix/include/libpngNN
Revised makefiles to make symlink to in addition to
Version 1.2.2beta6 [March 31, 2002]
Version 1.0.13beta1 [March 31, 2002]
Prevent png_zalloc() from trying to memset memory that it failed to acquire.
Add typecasts of PNG_MAX_UINT in pngset_cHRM_fixed() (Matt Holgate).
Ensure that the right function (user or default) is used to free the
png_struct after an error in png_create_read_struct_2().
Version 1.2.2rc1 [April 7, 2002]
Version 1.0.13rc1 [April 7, 2002]
Save the ebx register in pnggccrd.c (Sami Farin)
Add "mem_ptr = png_ptr->mem_ptr" in png_destroy_write_struct() (Paul Gardner).
Updated makefiles to put headers in include/libpng and remove old include/*.h.
Version 1.2.2 [April 15, 2002]
Version 1.0.13 [April 15, 2002]
Revised description of png_set_filter() in libpng.3/libpng.txt.
Revised makefile.netbsd and added makefile.neNNbsd and makefile.freebsd
Version 1.0.13patch01 [April 17, 2002]
Version 1.2.2patch01 [April 17, 2002]
Changed ${PNGMAJ}.${PNGVER} bug to ${PNGVER} in makefile.sgi and
Fixed VER -> PNGVER typo in makefile.macosx and added install-static to
Added install: target to makefile.32sunu and makefile.64sunu
Version 1.0.13patch03 [April 18, 2002]
Version 1.2.2patch03 [April 18, 2002]
Revised 15 makefiles to link libpng.a to libpngNN.a and the include libpng
subdirectory to libpngNN subdirectory without the full pathname.
Moved generation of libpng.pc from "install" to "all" in 15 makefiles.
Version 1.2.3rc1 [April 28, 2002]
Added install-man target to 15 makefiles (Dimitri Papadopolous-Orfanos).
Added $(DESTDIR) feature to 24 makefiles (Tim Mooney)
Fixed bug with $prefix, should be $(prefix) in makefile.hpux.
Updated cygwin-specific portion of pngconf.h and revised makefile.cygwin
Added a link from libpngNN.pc to libpng.pc in 15 makefiles.
Added links from include/libpngNN/*.h to include/*.h in 24 makefiles.
Revised makefile.darwin to make relative links without full pathname.
Added setjmp() at the end of png_create_*_struct_2() in case user forgets
to put one in their application.
Restored png_zalloc() and png_zfree() prototypes to version 1.2.1 and
removed them from module definition files.
Version 1.2.3rc2 [May 1, 2002]
Fixed bug in reporting number of channels in pngget.c and pngset.c,
that was introduced in version 1.2.2beta5.
Exported png_zalloc(), png_zfree(), png_default_read(), png_default_write(),
png_default_flush(), and png_push_fill_buffer() and included them in
module definition files.
Added "libpng.pc" dependency to the "install-shared" target in 15 makefiles.
Version 1.2.3rc3 [May 1, 2002]
Revised prototype for png_default_flush()
Remove old libpng.pc and libpngNN.pc before installing new ones.
Version 1.2.3rc4 [May 2, 2002]
Typos in *.def files (png_default_read|write -> png_default_read|write_data)
In makefiles, changed rm libpng.NN.pc to rm libpngNN.pc
Added libpng-config and libpngNN-config and modified makefiles to install
Changed $(MANPATH) to $(DESTDIR)$(MANPATH) in makefiles
Added "Win32 DLL VB" configuration to projects/msvc/libpng.dsp
Version 1.2.3rc5 [May 11, 2002]
Changed "error" and "message" in prototypes to "error_message" and
"warning_message" to avoid namespace conflict.
Revised 15 makefiles to build libpng-config from libpng-config-*.in
Once more restored png_zalloc and png_zfree to regular nonexported form.
Restored png_default_read|write_data, png_default_flush, png_read_fill_buffer
to nonexported form, but with PNGAPI, and removed them from module def
Version 1.2.3rc6 [May 14, 2002]
Removed "PNGAPI" from png_zalloc() and png_zfree() in png.c
Changed "Gz" to "Gd" in projects/msvc/libpng.dsp and zlib.dsp.
Removed leftover libpng-config "sed" script from four makefiles.
Revised libpng-config creating script in 16 makefiles.
Version 1.2.3 [May 22, 2002]
Revised libpng-config target in makefile.cygwin.
Removed description of png_set_mem_fn() from documentation.
Revised makefile.freebsd.
Minor cosmetic changes to 15 makefiles, e.g., $(DI) = $(DESTDIR)/$(INCDIR).
Revised projects/msvc/README.txt
Changed -lpng to -lpngNN in LDFLAGS in several makefiles.
Version 1.2.4beta1 [May 24, 2002]
Added libpng.pc and libpng-config to "all:" target in 16 makefiles.
Fixed bug in 16 makefiles: $(DESTDIR)/$(LIBPATH) to $(DESTDIR)$(LIBPATH)
Added missing "\" before closing double quote in makefile.gcmmx.
Plugged various memory leaks; added png_malloc_warn() and png_set_text_2()
Version 1.2.4beta2 [June 25, 2002]
Plugged memory leak of png_ptr->current_text (Matt Holgate).
Check for buffer overflow before reading CRC in pngpread.c (Warwick Allison)
Added -soname to the loader flags in makefile.dec, makefile.sgi, and
Added "test-installed" target to makefile.linux, makefile.gcmmx,
makefile.sgi, and makefile.sggcc.
Version 1.2.4beta3 [June 28, 2002]
Plugged memory leak of row_buf in pngtest.c when there is a png_error().
Detect buffer overflow in pngpread.c when IDAT is corrupted with extra data.
Added "test-installed" target to makefile.32sunu, makefile.64sunu,
makefile.beos, makefile.darwin, makefile.dec, makefile.macosx,
makefile.solaris, makefile.hpux, makefile.hpgcc, and makefile.so9.
Version 1.2.4rc1 and 1.0.14rc1 [July 2, 2002]
Added "test-installed" target to makefile.cygwin and makefile.sco.
Revised pnggccrd.c to be able to back out version 1.0.x via PNG_1_0_X macro.
Version 1.2.4 and 1.0.14 [July 8, 2002]
Changed png_warning() to png_error() when width is too large to process.
Version 1.2.4patch01 [July 20, 2002]
Revised makefile.cygwin to use DLL number 12 instead of 13.
Version 1.2.5beta1 [August 6, 2002]
Added code to contrib/gregbook/readpng2.c to ignore unused chunks.
Replaced toucan.png in contrib/gregbook (it has been corrupt since 1.0.11)
Removed some stray *.o files from contrib/gregbook.
Changed png_error() to png_warning() about "Too much data" in pngpread.c
and about "Extra compressed data" in pngrutil.c.
Prevent png_ptr->pass from exceeding 7 in png_push_finish_row().
Updated makefile.hpgcc
Updated png.c and pnggccrd.c handling of return from png_mmx_support()
Version 1.2.5beta2 [August 15, 2002]
Only issue png_warning() about "Too much data" in pngpread.c when avail_in
is nonzero.
Updated makefiles to install a separate with its own rpath.
Version 1.2.5rc1 and 1.0.15rc1 [August 24, 2002]
Revised makefiles to not remove previous minor versions of shared libraries.
Version 1.2.5rc2 and 1.0.15rc2 [September 16, 2002]
Revised 13 makefiles to remove "-lz" and "-L$(ZLIBLIB)", etc., from shared
library loader directive.
Added missing "$OBJSDLL" line to makefile.gcmmx.
Added missing "; fi" to makefile.32sunu.
Version 1.2.5rc3 and 1.0.15rc3 [September 18, 2002]
Revised libpng-config script.
Version 1.2.5 and 1.0.15 [October 3, 2002]
Revised makefile.macosx, makefile.darwin, makefile.hpgcc, and makefile.hpux,
and makefile.aix.
Relocated two misplaced PNGAPI lines in pngtest.c
Version 1.2.6beta1 [October 22, 2002]
Commented out warning about uninitialized mmx_support in pnggccrd.c.
Changed "IBMCPP__" flag to "__IBMCPP__" in pngconf.h.
Relocated two more misplaced PNGAPI lines in pngtest.c
Fixed memory overrun bug in png_do_read_filler() with 16-bit datastreams,
introduced in version 1.0.2.
Revised makefile.macosx, makefile.dec, makefile.aix, and makefile.32sunu.
Version 1.2.6beta2 [November 1, 2002]
Added libpng-config "--ldopts" output.
Added "AR=ar" and "ARFLAGS=rc" and changed "ar rc" to "$(AR) $(ARFLAGS)"
in makefiles.
Version 1.2.6beta3 [July 18, 2004]
Reverted makefile changes from version 1.2.6beta2 and some of the changes
from version 1.2.6beta1; these will be postponed until version 1.2.7.
Version 1.2.6 is going to be a simple bugfix release.
Changed the one instance of "ln -sf" to "ln -f -s" in each Sun makefile.
Fixed potential overrun in pngerror.c by using strncpy instead of memcpy.
Added "#!/bin/sh" at the top of configure, for recognition of the
'x' flag under Cygwin (Cosmin).
Optimized vacuous tests that silence compiler warnings, in png.c (Cosmin).
Added support for PNG_USER_CONFIG, in pngconf.h (Cosmin).
Fixed the special memory handler for Borland C under DOS, in pngmem.c
Removed some spurious assignments in pngrutil.c (Cosmin).
Replaced 65536 with 65536L, and 0xffff with 0xffffL, to silence warnings
on 16-bit platforms (Cosmin).
Enclosed shift op expressions in parentheses, to silence warnings (Cosmin).
Used proper type png_fixed_point, to avoid problems on 16-bit platforms,
in png_handle_sRGB() (Cosmin).
Added compression_type to png_struct, and optimized the window size
inside the deflate stream (Cosmin).
Fixed definition of isnonalpha(), in pngerror.c and pngrutil.c (Cosmin).
Fixed handling of unknown chunks that come after IDAT (Cosmin).
Allowed png_error() and png_warning() to work even if png_ptr == NULL
Replaced row_info->rowbytes with row_bytes in png_write_find_filter()
Fixed definition of PNG_LIBPNG_VER_DLLNUM (Simon-Pierre).
Used PNG_LIBPNG_VER and PNG_LIBPNG_VER_STRING instead of the hardcoded
values in png.c (Simon-Pierre, Cosmin).
Initialized png_libpng_ver[] with PNG_LIBPNG_VER_STRING (Simon-Pierre).
Moved the definition of PNG_HEADER_VERSION_STRING near the definitions
of the other PNG_LIBPNG_VER_... symbols in png.h (Cosmin).
Relocated #ifndef PNGAPI guards in pngconf.h (Simon-Pierre, Cosmin).
Updated scripts/ (Cosmin).
Updated the MSVC project (Simon-Pierre, Cosmin).
Updated the Borland C++ Builder project (Cosmin).
Avoided access to asm_flags in pngvcrd.c, if PNG_1_0_X is defined (Cosmin).
Commented out warning about uninitialized mmx_support in pngvcrd.c (Cosmin).
Removed scripts/makefile.bd32 and scripts/pngdef.pas (Cosmin).
Added extra guard around inclusion of Turbo C memory headers, in pngconf.h
Renamed projects/msvc/ to projects/visualc6/, and projects/borland/ to
projects/cbuilder5/ (Cosmin).
Moved projects/visualc6/png32ms.def to scripts/pngw32.def,
and projects/visualc6/png.rc to scripts/pngw32.rc (Cosmin).
Added projects/visualc6/pngtest.dsp; removed contrib/msvctest/ (Cosmin).
Changed line endings to DOS style in cbuilder5 and visualc6 files, even
in the tar.* distributions (Cosmin).
Updated contrib/visupng/VisualPng.dsp (Cosmin).
Updated contrib/visupng/cexcept.h to version 2.0.0 (Cosmin).
Added a separate distribution with "configure" and supporting files (Junichi).
Version 1.2.6beta4 [July 28, 2004]
Added user ability to change png_size_t via a PNG_SIZE_T macro.
Added png_sizeof() and png_convert_size() functions.
Added PNG_SIZE_MAX (maximum value of a png_size_t variable.
Added check in png_malloc_default() for (size_t)size != (png_uint_32)size
which would indicate an overflow.
Changed sPLT failure action from png_error to png_warning and abandon chunk.
Changed sCAL and iCCP failures from png_error to png_warning and abandon.
Added png_get_uint_31(png_ptr, buf) function.
Added PNG_UINT_32_MAX macro.
Made png_zalloc() issue a png_warning and return NULL on potential
Turn on PNG_NO_ZALLOC_ZERO by default in version 1.2.x
Revised "clobber list" in pnggccrd.c so it will compile under gcc-3.4.
Revised Borland portion of png_malloc() to return NULL or issue
png_error() according to setting of PNG_FLAG_MALLOC_NULL_MEM_OK.
Added PNG_NO_SEQUENTIAL_READ_SUPPORTED macro to conditionally remove
sequential read support.
Added some "#if PNG_WRITE_SUPPORTED" blocks.
Added #ifdef to remove some redundancy in png_malloc_default().
Use png_malloc instead of png_zalloc to allocate the palette.
Version 1.0.16rc1 and 1.2.6rc1 [August 4, 2004]
Fixed buffer overflow vulnerability (CVE-2004-0597) in png_handle_tRNS().
Fixed NULL dereference vulnerability (CVE-2004-0598) in png_handle_iCCP().
Fixed integer overflow vulnerability (CVE-2004-0599) in png_read_png().
Fixed some harmless bugs in png_handle_sBIT, etc, that would cause
duplicate chunk types to go undetected.
Fixed some timestamps in the -config version
Rearranged order of processing of color types in png_handle_tRNS().
Added ROWBYTES macro to calculate rowbytes without integer overflow.
Updated makefile.darwin and removed makefile.macosx from scripts directory.
Imposed default one million column, one-million row limits on the image
dimensions, and added png_set_user_limits() function to override them.
Fixed wrong cast of returns from png_get_user_width|height_max().
Changed some "keep the compiler happy" from empty statements to returns,
Revised libpng.txt to remove 1.2.x stuff from the 1.0.x distribution
Version 1.0.16rc2 and 1.2.6rc2 [August 7, 2004]
Revised makefile.darwin and makefile.solaris. Removed makefile.macosx.
Revised pngtest's png_debug_malloc() to use png_malloc() instead of
png_malloc_default() which is not supposed to be exported.
Fixed off-by-one error in one of the conversions to PNG_ROWBYTES() in
pngpread.c. Bug was introduced in 1.2.6rc1.
Fixed bug in RGB to RGBX transformation introduced in 1.2.6rc1.
Fixed old bug in RGB to Gray transformation.
Fixed problem with 64-bit compilers by casting arguments to abs()
to png_int_32.
Changed "ln -sf" to "ln -f -s" in three makefiles (solaris, sco, so9).
Changed "HANDLE_CHUNK_*" to "PNG_HANDLE_CHUNK_*" (Cosmin)
Added "-@/bin/rm -f $(DL)/$(LIBNAME).so.$(PNGMAJ)" to 15 *NIX makefiles.
Added code to update the row_info->colortype in png_do_read_filler() (MSB).
Version 1.0.16rc3 and 1.2.6rc3 [August 9, 2004]
Eliminated use of "abs()" in testing cHRM and gAMA values, to avoid
trouble with some 64-bit compilers. Created PNG_OUT_OF_RANGE() macro.
Revised documentation of png_set_keep_unknown_chunks().
Check handle_as_unknown status in pngpread.c, as in pngread.c previously.
Moved "PNG_HANDLE_CHUNK_*" macros out of PNG_INTERNAL section of png.h
Added "rim" definitions for CONST4 and CONST6 in pnggccrd.c
Version 1.0.16rc4 and 1.2.6rc4 [August 10, 2004]
Fixed mistake in pngtest.c introduced in 1.2.6rc2 (declaration of
"pinfo" was out of place).
Version 1.0.16rc5 and 1.2.6rc5 [August 10, 2004]
section of png.h where they were inadvertently placed in version rc3.
Version 1.2.6 and 1.0.16 [August 15, 2004]
Revised pngtest so memory allocation testing is only done when PNG_DEBUG==1.
Version 1.2.7beta1 [August 26, 2004]
Removed unused pngasmrd.h file.
Removed references to for archived files. Added references to
PNG Spec (second edition) and the PNG ISO/IEC Standard.
Added "test-dd" target in 15 makefiles, to run pngtest in DESTDIR.
Fixed bug with "optimized window size" in the IDAT datastream, that
causes libpng to write PNG files with incorrect zlib header bytes.
Version 1.2.7beta2 [August 28, 2004]
Fixed bug with sCAL chunk and big-endian machines (David Munro).
Undid new code added in 1.2.6rc2 to update the color_type in
Added png_set_add_alpha() that updates color type.
Version 1.0.17rc1 and 1.2.7rc1 [September 4, 2004]
Revised png_set_strip_filler() to not remove alpha if color_type has alpha.
Version 1.2.7 and 1.0.17 [September 12, 2004]
Added makefile.hp64
Changed projects/msvc/png32ms.def to scripts/png32ms.def in makefile.cygwin
Version 1.2.8beta1 [November 1, 2004]
Fixed bug in png_text_compress() that would fail to complete a large block.
Fixed bug, introduced in libpng-1.2.7, that overruns a buffer during
strip alpha operation in png_do_strip_filler().
Added PNG_1_2_X definition in pngconf.h
Use #ifdef to comment out png_info_init in png.c and png_read_init in
pngread.c (as of 1.3.0)
Version 1.2.8beta2 [November 2, 2004]
Reduce color_type to a nonalpha type after strip alpha operation in
Version 1.2.8beta3 [November 3, 2004]
Revised definitions of PNG_MAX_UINT_32, PNG_MAX_SIZE, and PNG_MAXSUM
Version 1.2.8beta4 [November 12, 2004]
Fixed (again) definition of PNG_LIBPNG_VER_DLLNUM in png.h (Cosmin).
Added PNG_LIBPNG_BUILD_PRIVATE in png.h (Cosmin).
Set png_ptr->zstream.data_type to Z_BINARY, to avoid unnecessary detection
of data type in deflate (Cosmin).
Deprecated but continue to support SPECIALBUILD and PRIVATEBUILD in favor of
Version 1.2.8beta5 [November 20, 2004]
Use png_ptr->flags instead of png_ptr->transformations to pass
PNG_STRIP_ALPHA info to png_do_strip_filler(), to preserve ABI
Version 1.2.8rc1 [November 24, 2004]
Moved handling of BUILD macros from pngconf.h to png.h
Added definition of PNG_LIBPNG_BASE_TYPE in png.h, inadvertently
omitted from beta5.
Revised scripts/pngw32.rc
Despammed mailing addresses by masking "@" with "at".
Inadvertently installed a supposedly faster test version of pngrutil.c
Version 1.2.8rc2 [November 26, 2004]
Added two missing "\" in png.h
Change tests in pngread.c and pngpread.c to
if (png_ptr->transformations || (png_ptr->flags&PNG_FLAG_STRIP_ALPHA))
Version 1.2.8rc3 [November 28, 2004]
Reverted pngrutil.c to version libpng-1.2.8beta5.
Added scripts/makefile.elf with supporting code in pngconf.h for symbol
versioning (John Bowler).
Version 1.2.8rc4 [November 29, 2004]
Added projects/visualc7 (Simon-pierre).
Version 1.2.8rc5 [November 29, 2004]
Fixed new typo in scripts/pngw32.rc
Version 1.2.8 [December 3, 2004]
Removed projects/visualc7, added projects/visualc71.
Version 1.2.9beta1 [February 21, 2006]
Initialized some structure members in pngwutil.c to avoid gcc-4.0.0 complaints
Revised man page and libpng.txt to make it clear that one should not call
png_read_end or png_write_end after png_read_png or png_write_png.
Updated references to png-mng-implement mailing list.
Fixed an incorrect typecast in pngrutil.c
Added PNG_NO_READ_SUPPORTED conditional for making a write-only library.
Optimized alpha-inversion loops in pngwtran.c
Moved test for nonzero gamma outside of png_build_gamma_table() in pngrtran.c
Make sure num_trans is <= 256 before copying data in png_set_tRNS().
Make sure num_palette is <= 256 before copying data in png_set_PLTE().
Interchanged order of write_swap_alpha and write_invert_alpha transforms.
Added parentheses in the definition of PNG_LIBPNG_BUILD_TYPE (Cosmin).
Optimized zlib window flag (CINFO) in contrib/pngsuite/*.png (Cosmin).
Updated scripts/makefile.bc32 for Borland C++ 5.6 (Cosmin).
Exported png_get_uint_32, png_save_uint_32, png_get_uint_16, png_save_uint_16,
png_get_int_32, png_save_int_32, png_get_uint_31 (Cosmin).
Added type cast (png_byte) in png_write_sCAL() (Cosmin).
Fixed scripts/makefile.cygwin (Christian Biesinger, Cosmin).
Default iTXt support was inadvertently enabled.
Version 1.2.9beta2 [February 21, 2006]
Check for png_rgb_to_gray and png_gray_to_rgb read transformations before
checking for png_read_dither in pngrtran.c
Revised checking of chromaticity limits to accommodate extended RGB
colorspace (John Denker).
Changed line endings in some of the project files to CRLF, even in the
"Unix" tar distributions (Cosmin).
Made png_get_int_32 and png_save_int_32 always available (Cosmin).
Updated scripts/pngos2.def, scripts/pngw32.def and projects/wince/png32ce.def
with the newly exported functions.
Eliminated distributions without the "configure" script.
Updated INSTALL instructions.
Version 1.2.9beta3 [February 24, 2006]
Fixed CRCRLF line endings in contrib/visupng/VisualPng.dsp
Made libpng.pc respect EXEC_PREFIX (D. P. Kreil, J. Bowler)
Removed reference to pngasmrd.h from
Renamed CHANGES to ChangeLog.
Created AUTHORS file.
Version 1.2.9beta4 [March 3, 2006]
Changed definition of PKGCONFIG from $prefix/lib to $libdir in
Reverted to filenames LICENSE and ANNOUNCE; removed AUTHORS and COPYING.
Removed newline from the end of some error and warning messages.
Removed test for sqrt() from and configure.
Made swap tables in pngtrans.c PNG_CONST (Carlo Bramix).
Disabled default iTXt support that was inadvertently enabled in
Added "OS2" to list of systems that don't need underscores, in pnggccrd.c
Removed libpng version and date from *.c files.
Version 1.2.9beta5 [March 4, 2006]
Removed trailing blanks from source files.
Put version and date of latest change in each source file, and changed
copyright year accordingly.
More cleanup of,, and associated scripts.
Restored scripts/makefile.elf which was inadvertently deleted.
Version 1.2.9beta6 [March 6, 2006]
Fixed typo (RELEASE) in configuration files.
Version 1.2.9beta7 [March 7, 2006]
Removed libpng.vers and libpng.sym from libpng12_la_SOURCES in
Fixed inconsistent #ifdef's around png_sig_bytes() and png_set_sCAL_s()
in png.h.
Updated makefile.elf as suggested by debian.
Made cosmetic changes to some makefiles, adding LN_SF and other macros.
Made some makefiles accept "exec_prefix".
Version 1.2.9beta8 [March 9, 2006]
Fixed some "#if defined (..." which should be "#if defined(..."
Bug introduced in libpng-1.2.8.
Fixed inconsistency in definition of png_default_read_data()
Restored blank that was lost from makefile.sggcc "clean" target in beta7.
Revised calculation of "current" and "major" for irix in
Changed "mkdir" to "MKDIR_P" in some makefiles.
Added png_set_expand_gray_1_2_4_to_8() and deprecated
png_set_gray_1_2_4_to_8() which also expands tRNS to alpha.
Version 1.2.9beta9 [March 10, 2006]
Include "config.h" in pngconf.h when available.
Added some checks for NULL png_ptr or NULL info_ptr (timeless)
Version 1.2.9beta10 [March 20, 2006]
Removed extra CR from contrib/visualpng/VisualPng.dsw (Cosmin)
Made pnggccrd.c PIC-compliant (Christian Aichinger).
Added makefile.mingw (Wolfgang Glas).
Revised pngconf.h MMX checking.
Version 1.2.9beta11 [March 22, 2006]
Fixed out-of-order declaration in pngwrite.c that was introduced in beta9
Simplified some makefiles by using LIBSO, LIBSOMAJ, and LIBSOVER macros.
Version 1.2.9rc1 [March 31, 2006]
Defined PNG_USER_PRIVATEBUILD when including "pngusr.h" (Cosmin).
Removed nonsensical assertion check from pngtest.c (Cosmin).
Version 1.2.9 [April 14, 2006]
Revised makefile.beos and added "none" selector in
Version 1.2.10beta1 [April 15, 2006]
Renamed "config.h" to "png_conf.h" and revised to add
-DPNG_BUILDING_LIBPNG to compile directive, and modified pngconf.h
to include png_conf.h only when PNG_BUILDING_LIBPNG is defined.
Version 1.2.10beta2 [April 15, 2006]
Manually updated and configure. Changed
back to config.h.
Version 1.2.10beta3 [April 15, 2006]
Change png_conf.h back to config.h in pngconf.h.
Version 1.2.10beta4 [April 16, 2006]
Version 1.2.10beta5 [April 16, 2006]
Added a configure check for compiling assembler code in pnggccrd.c
Version 1.2.10beta6 [April 17, 2006]
Revised the configure check for pnggccrd.c
Added @LIBPNG_DEFINES@ to arguments when building libpng.sym
Version 1.2.10beta7 [April 18, 2006]
Change "exec_prefix=$prefix" to "exec_prefix=$(prefix)" in makefiles.
Version 1.2.10rc1 [April 19, 2006]
Ensure pngconf.h doesn't define both PNG_USE_PNGGCCRD and PNG_USE_PNGVCRD
Fixed "LN_FS" typo in makefile.sco and makefile.solaris.
Version 1.2.10rc2 [April 20, 2006]
in and configure
Made the configure warning about versioned symbols less arrogant.
Version 1.2.10rc3 [April 21, 2006]
Added a note in libpng.txt that png_set_sig_bytes(8) can be used when
writing an embedded PNG without the 8-byte signature.
Revised makefiles and configure to avoid making links to*
Version 1.2.10 [April 23, 2006]
Reverted configure to "rc2" state.
Version 1.2.11beta1 [May 31, 2006]
scripts/ contained "configure" style version info and would
not work with makefiles.
The shared-library makefiles were linking to instead of compatibility as the library.
Version 1.2.11beta2 [June 2, 2006]
Increased sprintf buffer from 50 to 52 chars in pngrutil.c to avoid
buffer overflow.
Fixed bug in example.c (png_set_palette_rgb -> png_set_palette_to_rgb)
Version 1.2.11beta3 [June 5, 2006]
Prepended "#! /bin/sh" to and contrib/pngminus/*.sh (Cosmin).
Removed the accidental leftover (Cosmin).
Avoided potential buffer overflow and optimized buffer in
png_write_sCAL(), png_write_sCAL_s() (Cosmin).
Removed the include directories and libraries from CFLAGS and LDFLAGS
in scripts/makefile.gcc (Nelson A. de Oliveira, Cosmin).
Version 1.2.11beta4 [June 6, 2006]
Allow zero-length IDAT chunks after the entire zlib datastream, but not
after another intervening chunk type.
Version 1.0.19rc1, 1.2.11rc1 [June 13, 2006]
Deleted extraneous square brackets from [config.h] in
Version 1.0.19rc2, 1.2.11rc2 [June 14, 2006]
Added prototypes for PNG_INCH_CONVERSIONS functions to png.h
Revised INSTALL and
Fixed typo in several makefiles (-W1 should be -Wl)
Added typedef for png_int_32 and png_uint_32 on 64-bit systems.
Version 1.0.19rc3, 1.2.11rc3 [June 15, 2006]
Removed the new typedefs for 64-bit systems (delay until version 1.4.0)
Added one zero element to png_gamma_shift[] array in pngrtran.c to avoid
reading out of bounds.
Version 1.0.19rc4, 1.2.11rc4 [June 15, 2006]
Really removed the new typedefs for 64-bit systems.
Version 1.0.19rc5, 1.2.11rc5 [June 22, 2006]
Removed png_sig_bytes entry from scripts/pngw32.def
Version 1.0.19, 1.2.11 [June 26, 2006]
Version 1.0.20, 1.2.12 [June 27, 2006]
Really increased sprintf buffer from 50 to 52 chars in pngrutil.c to avoid
buffer overflow.
Version 1.2.13beta1 [October 2, 2006]
Removed AC_FUNC_MALLOC from
Work around Intel-Mac compiler bug by setting PNG_NO_MMX_CODE in pngconf.h
Change "logical" to "bitwise" throughout documentation.
Detect and fix attempt to write wrong iCCP profile length (CVE-2006-7244)
Version 1.0.21, 1.2.13 [November 14, 2006]
Fix potential buffer overflow in sPLT chunk handler.
Fix to not try to link to noexistent files.
Check all exported functions for NULL png_ptr.
Version 1.2.14beta1 [November 17, 2006]
Relocated three misplaced tests for NULL png_ptr.
Built with automake-1.9.6 instead of 1.9.2.
Build configure with autoconf-2.60 instead of 2.59
Version 1.2.14beta2 [November 17, 2006]
Added some typecasts in png_zalloc().
Version 1.2.14rc1 [November 20, 2006]
Changed "strtod" to "png_strtod" in pngrutil.c
Version 1.0.22, 1.2.14 [November 27, 2006]
Added missing "$(srcdir)" in and
Version 1.2.15beta1 [December 3, 2006]
Generated configure with autoconf-2.61 instead of 2.60
Revised to update libpng.pc and libpng-config.
Version 1.2.15beta2 [December 3, 2006]
Always export MMX asm functions, just stubs if not building pnggccrd.c
Version 1.2.15beta3 [December 4, 2006]
Add "png_bytep" typecast to profile while calculating length in pngwutil.c
Version 1.2.15beta4 [December 7, 2006]
Added scripts/CMakeLists.txt
Changed PNG_NO_ASSEMBLER_CODE to PNG_NO_MMX_CODE in scripts, like 1.4.0beta
Version 1.2.15beta5 [December 7, 2006]
Changed some instances of PNG_ASSEMBLER_* to PNG_MMX_* in pnggccrd.c
Revised scripts/CMakeLists.txt
Version 1.2.15beta6 [December 13, 2006]
Revised scripts/CMakeLists.txt and
Version 1.2.15rc1 [December 18, 2006]
Revised scripts/CMakeLists.txt
Version 1.2.15rc2 [December 21, 2006]
Added conditional #undef jmpbuf in pngtest.c to undo #define in AIX headers.
Added scripts/makefile.nommx
Version 1.2.15rc3 [December 25, 2006]
Fixed shared library numbering error that was introduced in 1.2.15beta6.
Version 1.2.15rc4 [December 27, 2006]
Fixed handling of rgb_to_gray when png_ptr->color.gray isn't set.
Version 1.2.15rc5 [December 31, 2006]
Revised handling of rgb_to_gray.
Version 1.2.15 [January 5, 2007]
Added some (unsigned long) typecasts in pngtest.c to avoid printing errors.
Version 1.2.16beta1 [January 6, 2007]
Fix bugs in makefile.nommx
Version 1.2.16beta2 [January 16, 2007]
Revised scripts/CMakeLists.txt
Version 1.2.16 [January 31, 2007]
No changes.
Version 1.2.17beta1 [March 6, 2007]
Revised scripts/CMakeLists.txt to install both shared and static libraries.
Deleted a redundant line from pngset.c.
Version 1.2.17beta2 [April 26, 2007]
Relocated misplaced test for png_ptr == NULL in pngpread.c
Change "==" to "&" for testing PNG_RGB_TO_GRAY_ERR & PNG_RGB_TO_GRAY_WARN
Changed remaining instances of PNG_ASSEMBLER_* to PNG_MMX_*
Added pngerror() when write_IHDR fails in deflateInit2().
Added "const" to some array declarations.
Mention examples of libpng usage in the libpng*.txt and libpng.3 documents.
Version 1.2.17rc1 [May 4, 2007]
No changes.
Version 1.2.17rc2 [May 8, 2007]
Moved several PNG_HAVE_* macros out of PNG_INTERNAL because applications
calling set_unknown_chunk_location() need them.
Changed transformation flag from PNG_EXPAND_tRNS to PNG_EXPAND in
Added png_ptr->unknown_chunk to hold working unknown chunk data, so it
can be free'ed in case of error. Revised unknown chunk handling in
pngrutil.c and pngpread.c to use this structure.
Version 1.2.17rc3 [May 8, 2007]
Revised symbol-handling in configure script.
Version 1.2.17rc4 [May 10, 2007]
Revised unknown chunk handling to avoid storing unknown critical chunks.
Version 1.0.25 [May 15, 2007]
Version 1.2.17 [May 15, 2007]
Added "png_ptr->num_trans=0" before error return in png_handle_tRNS,
to eliminate a vulnerability (CVE-2007-2445, CERT VU#684664)
Version 1.0.26 [May 15, 2007]
Version 1.2.18 [May 15, 2007]
Reverted the libpng-1.2.17rc3 change to symbol-handling in configure script
Version 1.2.19beta1 [May 18, 2007]
Changed "const static" to "static PNG_CONST" everywhere, mostly undoing
change of libpng-1.2.17beta2. Changed other "const" to "PNG_CONST"
Changed some handling of unused parameters, to avoid compiler warnings.
"if (unused == NULL) return;" becomes "unused = unused".
Version 1.2.19beta2 [May 18, 2007]
Only use the valid bits of tRNS value in png_do_expand() (Brian Cartier)
Version 1.2.19beta3 [May 19, 2007]
Add some "png_byte" typecasts in png_check_keyword() and write new_key
instead of key in zTXt chunk (Kevin Ryde).
Version 1.2.19beta4 [May 21, 2007]
Add png_snprintf() function and use it in place of sprint() for improved
defense against buffer overflows.
Version 1.2.19beta5 [May 21, 2007]
Fixed png_handle_tRNS() to only use the valid bits of tRNS value.
Changed handling of more unused parameters, to avoid compiler warnings.
Removed some PNG_CONST in pngwutil.c to avoid compiler warnings.
Version 1.2.19beta6 [May 22, 2007]
Added some #ifdef PNG_MMX_CODE_SUPPORTED where needed in pngvcrd.c
Added a special "_MSC_VER" case that defines png_snprintf to _snprintf
Version 1.2.19beta7 [May 22, 2007]
Squelched png_squelch_warnings() in pnggccrd.c and added
an #ifdef PNG_MMX_CODE_SUPPORTED block around the declarations that caused
the warnings that png_squelch_warnings was squelching.
Version 1.2.19beta8 [May 22, 2007]
Removed __MMX__ from test in pngconf.h.
Version 1.2.19beta9 [May 23, 2007]
Made png_squelch_warnings() available via PNG_SQUELCH_WARNINGS macro.
Revised png_squelch_warnings() so it might work.
Updated makefile.sgcc and makefile.solaris; added makefile.solaris-x86.
Version 1.2.19beta10 [May 24, 2007]
Resquelched png_squelch_warnings(), use "__attribute__((used))" instead.
Version 1.4.0beta1 [April 20, 2006]
Enabled iTXt support (changes png_struct, thus requires so-number change).
Eliminated PNG_1_0_X and PNG_1_2_X macros.
Removed deprecated functions png_read_init, png_write_init, png_info_init,
png_permit_empty_plte, png_set_gray_1_2_4_to_8, png_check_sig, and
removed the deprecated macro PNG_MAX_UINT.
Moved "PNG_INTERNAL" parts of png.h and pngconf.h into pngintrn.h
Removed many WIN32_WCE #ifdefs (Cosmin).
Reduced dependency on C-runtime library when on Windows (Simon-Pierre)
Replaced sprintf() with png_sprintf() (Simon-Pierre)
Version 1.4.0beta2 [April 20, 2006]
Revised makefiles and configure to avoid making links to*
Moved some leftover MMX-related defines from pngconf.h to pngintrn.h
Updated scripts/pngos2.def, pngw32.def, and projects/wince/png32ce.def
Version 1.4.0beta3 [May 10, 2006]
Updated scripts/pngw32.def to comment out MMX functions.
Added PNG_NO_GET_INT_32 and PNG_NO_SAVE_INT_32 macros.
Scripts/ contained "configure" style version info and would
not work with makefiles.
Revised pngconf.h and added, so makefiles and configure can
pass defines to libpng and applications.
Version 1.4.0beta4 [May 11, 2006]
Revised,, and many of the makefiles to write
their defines in pngconf.h.
Version 1.4.0beta5 [May 15, 2006]
Added a missing semicolon in and
Deleted extraneous square brackets from
Version 1.4.0beta6 [June 2, 2006]
Increased sprintf buffer from 50 to 52 chars in pngrutil.c to avoid
buffer overflow.
Changed sonum from 0 to 1.
Removed unused prototype for png_check_sig() from png.h
Version 1.4.0beta7 [June 16, 2006]
Exported png_write_sig (Cosmin).
Optimized buffer in png_handle_cHRM() (Cosmin).
Set pHYs = 2835 x 2835 pixels per meter, and added
sCAL = 0.352778e-3 x 0.352778e-3 meters, in pngtest.png (Cosmin).
Added png_set_benign_errors(), png_benign_error(), png_chunk_benign_error().
Added typedef for png_int_32 and png_uint_32 on 64-bit systems.
Added "(unsigned long)" typecast on png_uint_32 variables in printf lists.
Version 1.4.0beta8 [June 22, 2006]
Added demonstration of user chunk support in pngtest.c, to support the
public sTER chunk and a private vpAg chunk.
Version 1.4.0beta9 [July 3, 2006]
Removed ordinals from scripts/pngw32.def and removed png_info_int and
png_set_gray_1_2_4_to_8 entries.
Inline call of png_get_uint_32() in png_get_uint_31().
Use png_get_uint_31() to get vpAg width and height in pngtest.c
Removed WINCE and Netware projects.
Removed standalone Y2KINFO file.
Version 1.4.0beta10 [July 12, 2006]
Eliminated automatic copy of pngconf.h to from configure and
some makefiles, because it was not working reliably. Instead, distribute along with pngconf.h and cause configure and some of the
makefiles to update pngconf.h from
Added pngconf.h to DEPENDENCIES in
Version 1.4.0beta11 [August 19, 2006]
Removed AC_FUNC_MALLOC from
Added a warning when writing iCCP profile with mismatched profile length.
Patched pnggccrd.c to assemble on x86_64 platforms.
Moved chunk header reading into a separate function png_read_chunk_header()
in pngrutil.c. The chunk header (len+sig) is now serialized in a single
operation (Cosmin).
Implemented support for I/O states. Added png_ptr member io_state, and
functions png_get_io_chunk_name() and png_get_io_state() in pngget.c
Added png_get_io_chunk_name and png_get_io_state to scripts/*.def (Cosmin).
Renamed scripts/pngw32.* to scripts/pngwin.* (Cosmin).
Removed the include directories and libraries from CFLAGS and LDFLAGS
in scripts/makefile.gcc (Cosmin).
Used png_save_uint_32() to set vpAg width and height in pngtest.c (Cosmin).
Cast to proper type when getting/setting vpAg units in pngtest.c (Cosmin).
Added pngintrn.h to the Visual C++ projects (Cosmin).
Removed scripts/list (Cosmin).
Updated copyright year in scripts/pngwin.def (Cosmin).
Removed PNG_TYPECAST_NULL and used standard NULL consistently (Cosmin).
Disallowed the user to redefine png_size_t, and enforced a consistent use
of png_size_t across libpng (Cosmin).
Changed the type of png_ptr->rowbytes, PNG_ROWBYTES() and friends
to png_size_t (Cosmin).
Removed png_convert_size() and replaced png_sizeof with sizeof (Cosmin).
Removed some unnecessary type casts (Cosmin).
Changed prototype of png_get_compression_buffer_size() and
png_set_compression_buffer_size() to work with png_size_t instead of
png_uint_32 (Cosmin).
Removed png_memcpy_check() and png_memset_check() (Cosmin).
Fixed a typo (png_byte --> png_bytep) in libpng.3 and libpng.txt (Cosmin).
Clarified that png_zalloc() does not clear the allocated memory,
and png_zalloc() and png_zfree() cannot be PNGAPI (Cosmin).
Renamed png_mem_size_t to png_alloc_size_t, fixed its definition in
pngconf.h, and used it in all memory allocation functions (Cosmin).
Renamed pngintrn.h to pngpriv.h, added a comment at the top of the file
mentioning that the symbols declared in that file are private, and
updated the scripts and the Visual C++ projects accordingly (Cosmin).
Removed circular references between pngconf.h and in
scripts/*win32 (Cosmin).
Removing trailing '.' from the warning and error messages (Cosmin).
Added pngdefs.h that is built by makefile or configure, instead of (Glenn).
Detect and fix attempt to write wrong iCCP profile length.
Version 1.4.0beta12 [October 19, 2006]
Changed "logical" to "bitwise" in the documentation.
Work around Intel-Mac compiler bug by setting PNG_NO_MMX_CODE in pngconf.h
Add a typecast to stifle compiler warning in pngrutil.c
Version 1.4.0beta13 [November 10, 2006]
Fix potential buffer overflow in sPLT chunk handler.
Fix to not try to link to noexistent files.
Version 1.4.0beta14 [November 15, 2006]
Check all exported functions for NULL png_ptr.
Version 1.4.0beta15 [November 17, 2006]
Relocated two misplaced tests for NULL png_ptr.
Built with automake-1.9.6 instead of 1.9.2.
Build configure with autoconf-2.60 instead of 2.59
Add "install: all" in so "configure; make install" will work.
Version 1.4.0beta16 [November 17, 2006]
Added a typecast in png_zalloc().
Version 1.4.0beta17 [December 4, 2006]
Changed "new_key[79] = '\0';" to "(*new_key)[79] = '\0';" in pngwutil.c
Add "png_bytep" typecast to profile while calculating length in pngwutil.c
Version 1.4.0beta18 [December 7, 2006]
Added scripts/CMakeLists.txt
Version 1.4.0beta19 [May 16, 2007]
Revised scripts/CMakeLists.txt
Rebuilt configure and with newer tools.
Added conditional #undef jmpbuf in pngtest.c to undo #define in AIX headers.
Added scripts/makefile.nommx
Version 1.4.0beta20 [July 9, 2008]
Moved several PNG_HAVE_* macros from pngpriv.h to png.h because applications
calling set_unknown_chunk_location() need them.
Moved several macro definitions from pngpriv.h to pngconf.h
Merge with changes to the 1.2.X branch, as of 1.2.30beta04.
Deleted all use of the MMX assembler code and Intel-licensed optimizations.
Revised makefile.mingw
Version 1.4.0beta21 [July 21, 2008]
Moved local array "chunkdata" from pngrutil.c to the png_struct, so
it will be freed by png_read_destroy() in case of a read error (Kurt
Version 1.4.0beta22 [July 21, 2008]
Change "purpose" and "buffer" to png_ptr->chunkdata to avoid memory leaking.
Version 1.4.0beta23 [July 22, 2008]
Change "chunkdata = NULL" to "png_ptr->chunkdata = NULL" several places in
Version 1.4.0beta24 [July 25, 2008]
Change all remaining "chunkdata" to "png_ptr->chunkdata" in
png_decompress_chunk(), and remove "chunkdata" from parameter list.
Put a call to png_check_chunk_name() in png_read_chunk_header().
Revised png_check_chunk_name() to reject a name with a lowercase 3rd byte.
Removed two calls to png_check_chunk_name() occurring later in the process.
Define PNG_NO_ERROR_NUMBERS by default in pngconf.h
Version 1.4.0beta25 [July 30, 2008]
Added a call to png_check_chunk_name() in pngpread.c
Reverted png_check_chunk_name() to accept a name with a lowercase 3rd byte.
Added png_push_have_buffer() function to pngpread.c
Eliminated PNG_BIG_ENDIAN_SUPPORTED and associated png_get_* macros.
Made inline expansion of png_get_*() optional with PNG_USE_READ_MACROS.
Synced contrib directory and configure files with libpng-1.2.30beta06.
Eliminated no-longer-used pngdefs.h (but it's still built in the makefiles)
Relocated a misplaced "#endif /* PNG_NO_WRITE_FILTER */" in pngwutil.c
Version 1.4.0beta26 [August 4, 2008]
Removed png_push_have_buffer() function in pngpread.c. It increased the
compiled library size slightly.
Changed "-Wall" to "-W -Wall" in the CFLAGS in all makefiles (Cosmin Truta)
Declared png_ptr "volatile" in pngread.c and pngwrite.c to avoid warnings.
Updated contrib/visupng/cexcept.h to version 2.0.1
Added PNG_LITERAL_CHARACTER macros for #, [, and ].
Version 1.4.0beta27 [August 5, 2008]
Revised usage of PNG_LITERAL_SHARP in pngerror.c.
Moved newline character from individual png_debug messages into the
png_debug macros.
Allow user to #define their own png_debug, png_debug1, and png_debug2.
Version 1.4.0beta28 [August 5, 2008]
Revised usage of PNG_LITERAL_SHARP in pngerror.c.
Version 1.4.0beta29 [August 9, 2008]
Revised usage of PNG_STRING_NEWLINE to work on non-ISO compilers.
Added non-ISO versions of png_debug macros.
Version 1.4.0beta30 [August 14, 2008]
Added premultiplied alpha feature (Volker Wiendl).
Version 1.4.0beta31 [August 18, 2008]
Moved png_set_premultiply_alpha from pngtrans.c to pngrtran.c
Removed extra crc check at the end of png_handle_cHRM(). Bug introduced
in libpng-1.4.0beta20.
Version 1.4.0beta32 [August 19, 2008]
Added PNG_WRITE_FLUSH_SUPPORTED block around new png_flush() call.
Revised PNG_NO_STDIO version of png_write_flush()
Version 1.4.0beta33 [August 20, 2008]
Added png_get|set_chunk_cache_max() to limit the total number of sPLT,
text, and unknown chunks that can be stored.
Version 1.4.0beta34 [September 6, 2008]
Shortened tIME_string to 29 bytes in pngtest.c
Fixed off-by-one error introduced in png_push_read_zTXt() function in
libpng-1.2.30beta04/pngpread.c (Harald van Dijk)
Version 1.4.0beta35 [October 6, 2008]
Changed "trans_values" to "trans_color".
Changed so-number from 0 to 14. Some OS do not like 0.
Revised makefile.darwin to fix shared library numbering.
Change png_set_gray_1_2_4_to_8() to png_set_expand_gray_1_2_4_to_8()
in example.c (debian bug report)
Version 1.4.0beta36 [October 25, 2008]
Sync with tEXt vulnerability fix in libpng-1.2.33rc02.
Version 1.4.0beta37 [November 13, 2008]
Added png_check_cHRM in png.c and moved checking from pngget.c, pngrutil.c,
and pngwrite.c
Version 1.4.0beta38 [November 22, 2008]
Added check for zero-area RGB cHRM triangle in png_check_cHRM() and
Version 1.4.0beta39 [November 23, 2008]
Revised png_warning() to write its message on standard output by default
when warning_fn is NULL.
Version 1.4.0beta40 [November 24, 2008]
Eliminated png_check_cHRM(). Instead, always use png_check_cHRM_fixed().
In png_check_cHRM_fixed(), ensure white_y is > 0, and removed redundant
check for all-zero coordinates that is detected by the triangle check.
Version 1.4.0beta41 [November 26, 2008]
Fixed string vs pointer-to-string error in png_check_keyword().
Rearranged test expressions in png_check_cHRM_fixed() to avoid internal
Added PNG_NO_CHECK_cHRM conditional.
Version 1.4.0beta42, 43 [December 1, 2008]
Merge png_debug with version 1.2.34beta04.
Version 1.4.0beta44 [December 6, 2008]
Removed redundant check for key==NULL before calling png_check_keyword()
to ensure that new_key gets initialized and removed extra warning
(Merge with version 1.2.34beta05 -- Arvan Pritchard).
Version 1.4.0beta45 [December 9, 2008]
In png_write_png(), respect the placement of the filler bytes in an earlier
call to png_set_filler() (Jim Barry).
Version 1.4.0beta46 [December 10, 2008]
Undid previous change and added PNG_TRANSFORM_STRIP_FILLER_BEFORE and
PNG_TRANSFORM_STRIP_FILLER_AFTER conditionals and deprecated
Version 1.4.0beta47 [December 15, 2008]
Support for dithering was disabled by default, because it has never
been well tested and doesn't work very well. The code has not
been removed, however, and can be enabled by building libpng with
Version 1.4.0beta48 [February 14, 2009]
Added new exported function png_calloc().
Combined several instances of png_malloc(); png_memset() into png_calloc().
Removed prototype for png_freeptr() that was added in libpng-1.4.0beta24
but was never defined.
Version 1.4.0beta49 [February 28, 2009]
Added png_fileno() macro to pngconf.h, used in pngwio.c
Corrected order of #ifdef's in png_debug definition in png.h
Fixed bug introduced in libpng-1.4.0beta48 with the memset arguments
for pcal_params.
Fixed order of #ifdef directives in the png_debug defines in png.h
(bug introduced in libpng-1.2.34/1.4.0beta29).
Revised comments in png_set_read_fn() and png_set_write_fn().
Version 1.4.0beta50 [March 18, 2009]
Use png_calloc() instead of png_malloc() to allocate big_row_buf when
reading an interlaced file, to avoid a possible UMR.
Undid revision of PNG_NO_STDIO version of png_write_flush(). Users
having trouble with fflush() can build with PNG_NO_WRITE_FLUSH defined
or supply their own flush_fn() replacement.
Revised libpng*.txt and png.h documentation about use of png_write_flush()
and png_set_write_fn().
Removed fflush() from pngtest.c.
Added "#define PNG_NO_WRITE_FLUSH" to contrib/pngminim/encoder/pngusr.h
Version 1.4.0beta51 [March 21, 2009]
Removed new png_fileno() macro from pngconf.h .
Version 1.4.0beta52 [March 27, 2009]
Relocated png_do_chop() ahead of building gamma tables in pngrtran.c
This avoids building 16-bit gamma tables unnecessarily.
Removed fflush() from pngtest.c.
Added "#define PNG_NO_WRITE_FLUSH" to contrib/pngminim/encoder/pngusr.h
Added a section on differences between 1.0.x and 1.2.x to libpng.3/libpng.txt
Version 1.4.0beta53 [April 1, 2009]
Removed some remaining MMX macros from pngpriv.h
Fixed potential memory leak of "new_name" in png_write_iCCP() (Ralph Giles)
Version 1.4.0beta54 [April 13, 2009]
Added "ifndef PNG_SKIP_SETJMP_CHECK" block in pngconf.h to allow
application code writers to bypass the check for multiple inclusion
of setjmp.h when they know that it is safe to ignore the situation.
Eliminated internal use of setjmp() in pngread.c and pngwrite.c
Reordered ancillary chunks in pngtest.png to be the same as what
pngtest now produces, and made some cosmetic changes to pngtest output.
Eliminated deprecated png_read_init_3() and png_write_init_3() functions.
Version 1.4.0beta55 [April 15, 2009]
Simplified error handling in pngread.c and pngwrite.c by putting
the new png_read_cleanup() and png_write_cleanup() functions inline.
Version 1.4.0beta56 [April 25, 2009]
Renamed "user_chunk_data" to "my_user_chunk_data" in pngtest.c to suppress
"shadowed declaration" warning from gcc-4.3.3.
Renamed "gamma" to "png_gamma" in pngset.c to avoid "shadowed declaration"
warning about a global "gamma" variable in math.h on some platforms.
Version 1.4.0beta57 [May 2, 2009]
Removed prototype for png_freeptr() that was added in libpng-1.4.0beta24
but was never defined (again).
Rebuilt configure scripts with autoconf-2.63 instead of 2.62
Removed pngprefs.h and MMX from makefiles
Version 1.4.0beta58 [May 14, 2009]
Changed pngw32.def to pngwin.def in makefile.mingw (typo was introduced
in beta57).
Clarified usage of sig_bit versus sig_bit_p in example.c (Vincent Torri)
Version 1.4.0beta59 [May 15, 2009]
Reformated sources in libpng style (3-space intentation, comment format)
Fixed typo in libpng docs (PNG_FILTER_AVE should be PNG_FILTER_AVG)
Added sections about the git repository and our coding style to the
Relocated misplaced #endif in pngwrite.c, sCAL chunk handler.
Version 1.4.0beta60 [May 19, 2009]
Conditionally compile png_read_finish_row() which is not used by
progressive readers.
Added contrib/pngminim/preader to demonstrate building minimal progressive
decoder, based on contrib/gregbook with embedded libpng and zlib.
Version 1.4.0beta61 [May 20, 2009]
In contrib/pngminim/*, renamed "makefile.std" to "makefile", since there
is only one makefile in those directories, and revised the README files
More reformatting of comments, mostly to capitalize sentences.
Version 1.4.0beta62 [June 2, 2009]
Added "#define PNG_NO_WRITE_SWAP" to contrib/pngminim/encoder/pngusr.h
and "define PNG_NO_READ_SWAP" to decoder/pngusr.h and preader/pngusr.h
Reformatted several remaining "else statement" into two lines.
Added a section to the libpng documentation about using png_get_io_ptr()
in configure scripts to detect the presence of libpng.
Version 1.4.0beta63 [June 15, 2009]
Revised libpng*.txt and libpng.3 to mention calling png_set_IHDR()
multiple times and to specify the sample order in the tRNS chunk,
because the ISO PNG specification has a typo in the tRNS table.
PNG_HANDLE_AS_UNKNOWN_SUPPORTED, to make the png_set_keep mechanism
available for ignoring known chunks even when not saving unknown chunks.
Adopted preference for consistent use of "#ifdef" and "#ifndef" versus
"#if defined()" and "if !defined()" where possible.
Version 1.4.0beta64 [June 24, 2009]
Moved the various unknown chunk macro definitions outside of the
Version 1.4.0beta65 [June 26, 2009]
Added a reference to the libpng license in each file.
Version 1.4.0beta66 [June 27, 2009]
Refer to the libpng license instead of the libpng license in each file.
Version 1.4.0beta67 [July 6, 2009]
Relocated INVERT_ALPHA within png_read_png() and png_write_png().
Added high-level API transform PNG_TRANSFORM_GRAY_TO_RGB.
Added an "xcode" project to the projects directory (Alam Arias).
Version 1.4.0beta68 [July 19, 2009]
Avoid some tests in filter selection in pngwutil.c
Version 1.4.0beta69 [July 25, 2009]
Simplified the new filter-selection test. This runs faster in the
Removed extraneous declaration from the new call to png_read_gray_to_rgb()
(bug introduced in libpng-1.4.0beta67).
Fixed up xcode project (Alam Arias)
Added a prototype for png_64bit_product() in png.c
Version 1.4.0beta70 [July 27, 2009]
Avoid a possible NULL dereference in debug build, in png_set_text_2().
(bug introduced in libpng-0.95, discovered by Evan Rouault)
Version 1.4.0beta71 [July 29, 2009]
Rebuilt configure scripts with autoconf-2.64.
Version 1.4.0beta72 [August 1, 2009]
Replaced *.tar.lzma with *.tar.xz in distribution. Get the xz codec
from <>.
Version 1.4.0beta73 [August 1, 2009]
Reject attempt to write iCCP chunk with negative embedded profile length
(JD Chen) (CVE-2009-5063).
Version 1.4.0beta74 [August 8, 2009]
Changed png_ptr and info_ptr member "trans" to "trans_alpha".
Version 1.4.0beta75 [August 21, 2009]
Removed an extra png_debug() recently added to png_write_find_filter().
Fixed incorrect #ifdef in pngset.c regarding unknown chunk support.
Version 1.4.0beta76 [August 22, 2009]
Moved an incorrectly located test in png_read_row() in pngread.c
Version 1.4.0beta77 [August 27, 2009]
Removed lpXYZ.tar.bz2 (with CRLF), KNOWNBUG, libpng-x.y.z-KNOWNBUG.txt,
and the "noconfig" files from the distribution.
Moved CMakeLists.txt from scripts into the main libpng directory.
Various bugfixes and improvements to CMakeLists.txt (Philip Lowman)
Version 1.4.0beta78 [August 31, 2009]
Converted all PNG_NO_* tests to PNG_*_SUPPORTED everywhere except pngconf.h
Use png_malloc plus a loop instead of png_calloc() to initialize
row_pointers in png_read_png().
Version 1.4.0beta79 [September 1, 2009]
Eliminated PNG_GLOBAL_ARRAYS and PNG_LOCAL_ARRAYS; always use local arrays.
Eliminated PNG_CALLOC_SUPPORTED macro and always provide png_calloc().
Version 1.4.0beta80 [September 17, 2009]
Removed scripts/libpng.icc
Changed typecast of filler from png_byte to png_uint_16 in png_set_filler().
(Dennis Gustafsson)
Fixed typo introduced in beta78 in pngtest.c ("#if def " should be "#ifdef ")
Version 1.4.0beta81 [September 23, 2009]
Eliminated unused PNG_FLAG_FREE_* defines from pngpriv.h
Expanded TAB characters in pngrtran.c
Removed PNG_CONST from all "PNG_CONST PNG_CHNK" declarations to avoid
compiler complaints about doubly declaring things "const".
Changed all "#if [!]defined(X)" to "if[n]def X" where possible.
Eliminated unused png_ptr->row_buf_size
Version 1.4.0beta82 [September 25, 2009]
Moved redundant IHDR checking into new png_check_IHDR() in png.c
and report all errors found in the IHDR data.
Eliminated useless call to png_check_cHRM() from pngset.c
Version 1.4.0beta83 [September 25, 2009]
Revised png_check_IHDR() to eliminate bogus complaint about filter_type.
Version 1.4.0beta84 [September 30, 2009]
Fixed some inconsistent indentation in pngconf.h
Revised png_check_IHDR() to add a test for width variable less than 32-bit.
Version 1.4.0beta85 [October 1, 2009]
Revised png_check_IHDR() again, to check info_ptr members instead of
the contents of the returned parameters.
Version 1.4.0beta86 [October 9, 2009]
Updated the "xcode" project (Alam Arias).
Eliminated a shadowed declaration of "pp" in png_handle_sPLT().
Version 1.4.0rc01 [October 19, 2009]
Trivial cosmetic changes.
Version 1.4.0beta87 [October 30, 2009]
Moved version 1.4.0 back into beta.
Version 1.4.0beta88 [October 30, 2009]
Revised libpng*.txt section about differences between 1.2.x and 1.4.0
because most of the new features have now been ported back to 1.2.41
Version 1.4.0beta89 [November 1, 2009]
More bugfixes and improvements to CMakeLists.txt (Philip Lowman)
Removed a harmless extra png_set_invert_alpha() from pngwrite.c
Apply png_user_chunk_cache_max within png_decompress_chunk().
Merged libpng-1.2.41.txt with libpng-1.4.0.txt where appropriate.
Version 1.4.0beta90 [November 2, 2009]
Removed all remaining WIN32_WCE #ifdefs except those involving the
time.h "tm" structure
Version 1.4.0beta91 [November 3, 2009]
Updated scripts/pngw32.def and projects/wince/png32ce.def
Copied projects/wince/png32ce.def to the scripts directory.
Added scripts/makefile.wce
Patched for wince support.
Version 1.4.0beta92 [November 4, 2009]
Make inclusion of time.h in pngconf.h depend on PNG_CONVERT_tIME_SUPPORTED
Revised libpng*.txt to describe differences from 1.2.40 to 1.4.0 (instead
of differences from 1.2.41 to 1.4.0)
Version 1.4.0beta93 [November 7, 2009]
PNG_ALLOCATED macros to detect deprecated direct access to the
png_struct or info_struct members and other deprecated usage in
applications (John Bowler).
Updated scripts/makefile* to add "-DPNG_CONFIGURE_LIBPNG" to CFLAGS,
to prevent warnings about direct access to png structs by libpng
functions while building libpng. They need to be tested, especially
those using compilers other than gcc.
Updated projects/visualc6 and visualc71 with "/d PNG_CONFIGURE_LIBPNG".
They should work but still need to be updated to remove
references to pnggccrd.c or pngvcrd.c and ASM building.
Added README.txt to the beos, cbuilder5, netware, and xcode projects warning
that they need to be updated, to remove references to pnggccrd.c and
pngvcrd.c and to depend on pngpriv.h
Removed three direct references to read_info_ptr members in pngtest.c
that were detected by the new PNG_DEPSTRUCT macro.
Moved the png_debug macro definitions and the png_read_destroy(),
png_write_destroy() and png_far_to_near() prototypes from png.h
to pngpriv.h (John Bowler)
Moved the synopsis lines for png_read_destroy(), png_write_destroy()
png_debug(), png_debug1(), and png_debug2() from libpng.3 to libpngpf.3.
Version 1.4.0beta94 [November 9, 2009]
Removed the obsolete, unused pnggccrd.c and pngvcrd.c files.
Updated CMakeLists.txt to add "-DPNG_CONFIGURE_LIBPNG" to the definitions.
Removed dependency of pngtest.o on pngpriv.h in the makefiles.
Only #define PNG_DEPSTRUCT, etc. in pngconf.h if not already defined.
Version 1.4.0beta95 [November 10, 2009]
Changed png_check_sig() to !png_sig_cmp() in contrib programs.
Added -DPNG_CONFIGURE_LIBPNG to contrib/pngminm/*/makefile
Changed png_check_sig() to !png_sig_cmp() in contrib programs.
Corrected the png_get_IHDR() call in contrib/gregbook/readpng2.c
Changed pngminim/*/ to stop trying to remove pnggccrd.c and pngvcrd.c
Added dependency on pngpriv.h in contrib/pngminim/*/makefile
Version 1.4.0beta96 [November 12, 2009]
Renamed scripts/makefile.wce to scripts/makefile.cegcc
Revised to use libpng.sys while building
so that only PNG_EXPORT functions are exported.
Removed the deprecated png_check_sig() function/macro.
Removed recently removed function names from scripts/*.def
Revised pngtest.png to put chunks in the same order written by pngtest
(evidently the same change made in libpng-1.0beta54 was lost).
Added PNG_PRIVATE macro definition in pngconf.h for possible future use.
Version 1.4.0beta97 [November 13, 2009]
Restored pngtest.png to the libpng-1.4.0beta7 version.
Removed projects/beos and netware.txt; no one seems to be supporting them.
Version 1.4.0beta98 [November 13, 2009]
Added the "xcode" project to zip distributions,
Fixed a typo in scripts/pngwin.def introduced in beta97.
Version 1.4.0beta99 [November 14, 2009]
Moved and out of the scripts
directory, to and, respectively, and
modified and accordingly. Now "configure"
needs nothing from the "scripts" directory.
Avoid redefining PNG_CONST in pngconf.h
Version 1.4.0beta100 [November 14, 2009]
Removed ASM builds from projects/visualc6 and projects/visualc71
Removed scripts/makefile.nommx and makefile.vcawin32
Revised CMakeLists.txt to account for new location of
Updated INSTALL to reflect removal and relocation of files.
Version 1.4.0beta101 [November 14, 2009]
Restored the binary files (*.jpg, *.png, some project files) that were
accidentally deleted from the zip and 7z distributions when the xcode
project was added.
Version 1.4.0beta102 [November 18, 2009]
Added and to the zip and 7z distributions.
Fixed a typo in projects/visualc6/pngtest.dsp, introduced in beta100.
Moved descriptions of makefiles and other scripts out of INSTALL into
Updated the copyright year in scripts/pngwin.rc from 2006 to 2009.
Version 1.4.0beta103 [November 21, 2009]
Removed obsolete comments about ASM from projects/visualc71/README_zlib.txt
Align row_buf on 16-byte boundary in memory.
Restored the PNG_WRITE_FLUSH_AFTER_IEND_SUPPORTED guard around the call
to png_flush() after png_write_IEND(). See 1.4.0beta32, 1.4.0beta50
changes above and 1.2.30, 1.2.30rc01 and rc03 in 1.2.41 CHANGES. Someone
needs this feature.
Make the 'png_jmpbuf' macro expand to a call that records the correct
longjmp function as well as returning a pointer to the setjmp
jmp_buf buffer, and marked direct access to jmpbuf 'deprecated'.
(John Bowler)
Version 1.4.0beta104 [November 22, 2009]
Removed png_longjmp_ptr from scripts/*.def and libpng.3
Rebuilt configure scripts with autoconf-2.65
Version 1.4.0beta105 [November 25, 2009]
Use fast integer PNG_DIVIDE_BY_255() or PNG_DIVIDE_BY_65535()
to accomplish alpha premultiplication when
Changed "/255" to "/255.0" in background calculations to make it clear
that the 255 is used as a double.
Version 1.4.0beta106 [November 27, 2009]
Removed premultiplied alpha feature.
Version 1.4.0beta107 [December 4, 2009]
Updated README
Added "#define PNG_NO_PEDANTIC_WARNINGS" in the libpng source files.
Removed "-DPNG_CONFIGURE_LIBPNG" from the makefiles and projects.
Revised scripts/makefile.netbsd, makefile.openbsd, and makefile.sco
to put png.h and pngconf.h in $prefix/include, like the other scripts,
instead of in $prefix/include/libpng. Also revised makefile.sco
to put them in $prefix/include/libpng15 instead of in
Version 1.4.0beta108 [December 11, 2009]
Removed leftover "-DPNG_CONFIGURE_LIBPNG" from contrib/pngminim/*/makefile
Relocated png_do_chop() to its original position in pngrtran.c; the
change in version 1.2.41beta08 caused transparency to be handled wrong
in some 16-bit datastreams (Yusaku Sugai).
Version 1.4.0beta109 [December 13, 2009]
Added "bit_depth" parameter to the private png_build_gamma_table() function.
Pass bit_depth=8 to png_build_gamma_table() when bit_depth is 16 but the
PNG_16_TO_8 transform has been set, to avoid unnecessary build of 16-bit
Version 1.4.0rc02 [December 20, 2009]
Declared png_cleanup_needed "volatile" in pngread.c and pngwrite.c
Version 1.4.0rc03 [December 22, 2009]
Renamed back to and revised CMakeLists.txt
(revising the change in 1.4.0beta99)
Version 1.4.0rc04 [December 25, 2009]
in pngset.c to be consistent with other changes in version 1.2.38.
Version 1.4.0rc05 [December 25, 2009]
Changed "" to "" in, configure, and to be consistent with changes in libpng-1.4.0rc03
Version 1.4.0rc06 [December 29, 2009]
Reverted the gamma_table changes from libpng-1.4.0beta109.
Fixed some indentation errors.
Version 1.4.0rc07 [January 1, 2010]
Revised libpng*.txt and libpng.3 about 1.2.x->1.4.x differences.
Use png_calloc() instead of png_malloc(); png_memset() in pngrutil.c
Update copyright year to 2010.
Version 1.4.0rc08 [January 2, 2010]
Avoid deprecated references to png_ptr-io_ptr and png_ptr->error_ptr
in pngtest.c
Version 1.4.0 [January 3, 2010]
No changes.
Version 1.4.1beta01 [January 8, 2010]
Updated CMakeLists.txt for consistent indentation and to avoid an
unclosed if-statement warning (Philip Lowman).
Revised and to remove references to Y2KINFO,
KNOWNBUG, and (Robert Schwebel).
Revised the makefiles to install the same files and symbolic
links as configure, except for and
Make png_set|get_compression_buffer_size() available even when
PNG_WRITE_SUPPORTED is not enabled.
Revised and to simplify their maintenance.
Revised scripts/makefile.linux to install a link to
Version 1.4.1beta02 [January 9, 2010]
Revised the rest of the makefiles to install a link to
Version 1.4.1beta03 [January 10, 2010]
Removed png_set_premultiply_alpha() from scripts/*.def
Version 1.4.1rc01 [January 16, 2010]
No changes.
Version 1.4.1beta04 [January 23, 2010]
Revised png_decompress_chunk() to improve speed and memory usage when
decoding large chunks.
Added png_set|get_chunk_malloc_max() functions.
Version 1.4.1beta05 [January 26, 2010]
Relocated "int k" declaration in pngtest.c to minimize its scope.
Version 1.4.1beta06 [January 28, 2010]
Revised png_decompress_chunk() to use a two-pass method suggested by
John Bowler.
Version 1.4.1beta07 [February 6, 2010]
Folded some long lines in the source files.
Eliminated use of png_ptr->irowbytes and reused the slot in png_ptr as
Revised png_push_save_buffer() to do fewer but larger png_malloc() calls.
Version 1.4.1beta08 [February 6, 2010]
Minor cleanup and updating of dates and copyright year.
Version 1.5.0beta01 [February 7, 2010]
Moved declaration of png_struct into private pngstruct.h and png_info
into pnginfo.h
Version 1.4.1beta09 and 1.5.0beta02 [February 7, 2010]
Reverted to original png_push_save_buffer() code.
Version 1.4.1beta10 and 1.5.0beta03 [February 8, 2010]
Return allocated "old_buffer" in png_push_save_buffer() before
calling png_error(), to avoid a potential memory leak.
Updated configure script to use SO number 15.
Version 1.5.0beta04 [February 9, 2010]
Removed malformed "incomplete struct declaration" of png_info from png.h
Version 1.5.0beta05 [February 12, 2010]
Removed PNG_DEPSTRUCT markup in pngstruct.h and pnginfo.h, and undid the
linewrapping that it entailed.
Revised comments in pngstruct.h and pnginfo.h and added pointers to
the libpng license.
Removed the cbuilder5 project, which has not been updated to 1.4.0.
Version 1.4.1beta12 and 1.5.0beta06 [February 14, 2010]
Fixed type declaration of png_get_chunk_malloc_max() in pngget.c (Daisuke
Version 1.5.0beta07 [omitted]
Version 1.5.0beta08 [February 19, 2010]
wherever png_snprintf() is used to construct error and warning messages.
Noted in scripts/makefile.mingw that it expects to be run under MSYS.
Removed obsolete unused MMX-querying support from contrib/gregbook
Added exported png_longjmp() function.
Removed the AIX redefinition of jmpbuf in png.h
Added -D_ALLSOURCE in, makefile.aix, and CMakeLists.txt
when building on AIX.
Version 1.5.0beta09 [February 19, 2010]
Removed -D_ALLSOURCE from, makefile.aix, and CMakeLists.txt.
Changed the name of png_ptr->jmpbuf to png_ptr->png_jmpbuf in pngstruct.h
Version 1.5.0beta10 [February 25, 2010]
Removed unused gzio.c from contrib/pngminim gather and makefile scripts
Removed replacement error handlers from contrib/gregbook. Because of
the new png_longjmp() function they are no longer needed.
Version 1.5.0beta11 [March 6, 2010]
Removed checking for already-included setjmp.h from pngconf.h
Fixed inconsistent indentations and made numerous cosmetic changes.
Revised the "SEE ALSO" style of libpng.3, libpngpf.3, and png.5
Version 1.5.0beta12 [March 9, 2010]
Moved "#include png.h" inside pngpriv.h and removed "#include png.h" from
the source files, along with "#define PNG_EXPOSE_INTERNAL_STRUCTURES"
and "#define PNG_NO_PEDANTIC_WARNINGS" (John Bowler).
Created new pngdebug.h and moved debug definitions there.
Version 1.5.0beta13 [March 10, 2010]
Protect pngstruct.h, pnginfo.h, and pngdebug.h from being included twice.
Revise the "#ifdef" blocks in png_inflate() so it will compile when neither
is defined.
Removed unused png_measure_compressed_chunk() from pngpriv.h and libpngpf.3
Moved the 'config.h' support from pngconf.h to pngpriv.h
Removed PNGAPI from the png_longjmp_ptr typedef.
Eliminated dependence of pngtest.c on the private pngdebug.h file.
Make all png_debug macros into *unterminated* statements or
expressions (i.e. a trailing ';' must always be added) and correct
the format statements in various png_debug messages.
Version 1.5.0beta14 [March 14, 2010]
Removed direct access to png_ptr->io_ptr from the Windows code in pngtest.c
Revised to account for recent additions and replacements.
Corrected CE and OS/2 DEF files (scripts/png*def) for symbols removed and
added ordinal numbers to the Windows DEF file and corrected the duplicated
ordinal numbers on CE symbols that are commented out.
Added back in export symbols that can be present in the Windows build but
are disabled by default.
PNG_EXPORT changed to include an 'ordinal' field for DEF file generation.
PNG_CALLBACK added to make callback definitions uniform. PNGAPI split
into PNGCAPI (base C form), PNGAPI (exports) and PNGCBAPI (callbacks),
and appropriate changes made to all files. Cygwin builds re-hinged to
allow procedure call standard changes and to remove the need for the DEF
file (fixes build on Cygwin).
Enabled 'attribute' warnings that are relevant to library APIs and callbacks.
Changed rules for generation of the various symbol files and added a new
rule for a DEF file (which is also added to the distribution).
Updated the symbol file generation to stop it adding spurious spaces
to EOL (coming from preprocessor macro expansion). Added a facility
to join tokens in the output and rewrite *.dfn to use this.
Eliminated scripts/*.def in favor of libpng.def; updated projects/visualc71
and removed scripts/makefile.cygwin.
Made PNG_BUILD_DLL safe: it can be set whenever a DLL is being built.
Removed the include of sys/types.h - apparently unnecessary now on the
platforms on which it happened (all but Mac OS and RISC OS).
Moved the Mac OS test into pngpriv.h (the only place it is used.)
Version 1.5.0beta15 [March 17, 2010]
Added symbols.chk target to to validate the symbols in png.h
against the new DEF file scripts/symbols.def.
Changed the default DEF file back to pngwin.def.
Removed makefile.mingw.
Version 1.5.0beta16 [April 1, 2010]
Make png_text_struct independent of PNG_iTXt_SUPPORTED, so that
fields are initialized in all configurations. The READ/WRITE
macros (PNG_(READ|WRITE)_iTXt_SUPPORTED) still function as
before to disable code to actually read or write iTXt chunks
and iTXt_SUPPORTED can be used to detect presence of either
read or write support (but it is probably better to check for
the one actually required - read or write.)
Combined multiple png_warning() calls for a single error.
Restored the macro definition of png_check_sig().
Version 1.5.0beta17 [April 17, 2010]
Added some "(long)" typecasts to printf calls in png_handle_cHRM().
Documented the fact that png_set_dither() was disabled since libpng-1.4.0.
Reenabled png_set_dither() but renamed it to png_set_quantize() to reflect
more accurately what it actually does. At the same time, renamed
Added some "(long)" typecasts to printf calls in png_handle_cHRM().
Freeze build-time only configuration in the build.
In all prior versions of libpng most configuration options
controlled by compiler #defines had to be repeated by the
application code that used libpng. This patch changes this
so that compilation options that can only be changed at build
time are frozen in the build. Options that are compiler
dependent (and those that are system dependent) are evaluated
each time - pngconf.h holds these. Options that can be changed
per-file in the application are in png.h. Frozen options are
in the new installed header file pnglibconf.h (John Bowler)
Removed the xcode project because it has not been updated to work
with libpng-1.5.0.
Removed the ability to include optional pngusr.h
Version 1.5.0beta18 [April 17, 2010]
Restored the ability to include optional pngusr.h
Moved replacements for png_error() and png_warning() from the
contrib/pngminim project to pngerror.c, for use when warnings or
errors are disabled via PNG_NO_WARN or PNG_NO_ERROR_TEXT, to avoid
storing unneeded error/warning text.
Updated contrib/pngminim project to work with the new pnglibconf.h
Added some PNG_NO_* defines to contrib/pngminim/*/pngusr.h to save space.
Version 1.5.0beta19 [April 24, 2010]
Added PNG_{READ,WRITE}_INT_FUNCTIONS_SUPPORTED. This allows the functions
to read and write ints to be disabled independently of PNG_USE_READ_MACROS,
which allows libpng to be built with the functions even though the default
is to use the macros - this allows applications to choose at app build
time whether or not to use macros (previously impossible because the
functions weren't in the default build.)
Changed Windows calling convention back to __cdecl for API functions.
For Windows/x86 platforms only:
__stdcall is no longer needed for Visual Basic, so libpng-1.5.0 uses
__cdecl throughout (both API functions and callbacks) on Windows/x86
Replaced visualc6 and visualc71 projects with new vstudio project
Relaxed the overly-restrictive permissions of some files.
Version 1.5.0beta20 [April 24, 2010]
Relaxed more overly-restrictive permissions of some files.
Version 1.5.0beta21 [April 27, 2010]
Removed some unwanted binary bytes and changed CRLF to NEWLINE in the new
vstudio project files, and some trivial editing of some files in the
scripts directory.
contrib/pngminim/decoder/pngusr.h to make a smaller decoder application.
Version 1.5.0beta22 [April 28, 2010]
Fixed dependencies of GET_INT_32 - it does not require READ_INT_FUNCTIONS
because it has a macro equivalent.
Improved the options.awk script; added an "everything off" option.
Revised contrib/pngminim to use the "everything off" option in pngusr.dfa.
Version 1.5.0beta23 [April 29, 2010]
Corrected PNG_REMOVED macro to take five arguments.
The macro was documented with two arguments (name,ordinal), however
the symbol checking .dfn files assumed five arguments. The five
argument form seems more useful so it is changed to that.
in gregbook/readpng2.c
Corrected protection of png_get_user_transform_ptr. The API declaration in
png.h is removed if both READ and WRITE USER_TRANSFORM are turned off
but was left defined in pngtrans.c
Added logunsupported=1 to cause pnglibconf.h to document disabled options.
This makes the installed pnglibconf.h more readable but causes no
other change. The intention is that users of libpng will find it
easier to understand if an API they need is missing.
Include png_reset_zstream() in png.c only when PNG_READ_SUPPORTED is defined.
Removed dummy_inflate.c from contrib/pngminim/encoder
Removed contrib/pngminim/*/; gathering is now done in the makefile.
Version 1.5.0beta24 [May 7, 2010]
Use bitwise "&" instead of arithmetic mod in pngrutil.c calculation of the
offset of the png_ptr->rowbuf pointer into png_ptr->big_row_buf.
Added more blank lines for readability.
Version 1.5.0beta25 [June 18, 2010]
In pngpread.c: png_push_have_row() add check for new_row > height
Removed the now-redundant check for out-of-bounds new_row from example.c
Version 1.5.0beta26 [June 18, 2010]
In pngpread.c: png_push_process_row() add check for too many rows.
Version 1.5.0beta27 [June 18, 2010]
Removed the check added in beta25 as it is now redundant.
Version 1.5.0beta28 [June 20, 2010]
Rewrote png_process_IDAT_data to consistently treat extra data as warnings
and handle end conditions more cleanly.
Removed the new (beta26) check in png_push_process_row().
Version 1.5.0beta29 [June 21, 2010]
Revised scripts/options.awk to work on Sunos (but still doesn't work)
Added comment to options.awk and contrib/pngminim/*/makefile to try nawk.
Version 1.5.0beta30 [June 22, 2010]
Stop memory leak when reading a malformed sCAL chunk.
Version 1.5.0beta31 [June 26, 2010]
Revised pngpread.c patch of beta28 to avoid an endless loop.
Removed some trailing blanks.
Version 1.5.0beta32 [June 26, 2010]
Removed leftover scripts/options.patch and scripts/options.rej
Version 1.5.0beta33 [July 6, 3010]
Made FIXED and FLOATING options consistent in the APIs they enable and
disable. Corrected scripts/options.awk to handle both command line
options and options specified in the .dfa files.
Changed char *msg to PNG_CONST char *msg in pngrutil.c
Make png_set_sRGB_gAMA_and_cHRM set values using either the fixed or
floating point APIs, but not both.
Reversed patch to remove error handler when the jmp_buf is stored in the
main program structure, not the png_struct.
The error handler is needed because the default handler in libpng will
always use the jmp_buf in the library control structure; this is never
set. The gregbook code is a useful example because, even though it
uses setjmp/longjmp, it shows how error handling can be implemented
using control mechanisms not directly supported by libpng. The
technique will work correctly with mechanisms such as Microsoft
Structure Exceptions or C++ exceptions (compiler willing - note that gcc
does not by default support interworking of C and C++ error handling.)
Reverted changes to call png_longjmp in contrib/gregbook where it is not
appropriate. If mainprog->jmpbuf is used by setjmp, then png_longjmp
cannot be used.
Changed "extern PNG_EXPORT" to "PNG_EXPORT" in png.h (Jan Nijtmans)
Changed "extern" to "PNG_EXTERN" in pngpriv.h (except for the 'extern "C" {')
Version 1.5.0beta34 [July 12, 2010]
Put #ifndef PNG_EXTERN, #endif around the define PNG_EXTERN in pngpriv.h
Version 1.5.0beta35 [July 24, 2010]
Removed some newly-added TAB characters.
Added -DNO_PNG_SNPRINTF to CFLAGS in scripts/makefile.dj2
Moved the definition of png_snprintf() outside of the enclosing
#ifdef blocks in pngconf.h
Version 1.5.0beta36 [July 29, 2010]
Patches by John Bowler:
Fixed point APIs are now supported throughout (no missing APIs).
Internal fixed point arithmetic support exists for all internal floating
point operations.
sCAL validates the floating point strings it is passed.
Safe, albeit rudimentary, Watcom support is provided by PNG_API_RULE==2
Two new APIs exist to get the number of passes without turning on the
PNG_INTERLACE transform and to get the number of rows in the current
A new test program, pngvalid.c, validates the gamma code.
Errors in the 16-bit gamma correction (overflows) have been corrected.
cHRM chunk testing is done consistently (previously the floating point
API bypassed it, because the test really didn't work on FP, now the test
is performed on the actual values to be stored in the PNG file so it
works in the FP case too.)
Most floating point APIs now simply call the fixed point APIs after
converting the values to the fixed point form used in the PNG file.
The standard headers no longer include zlib.h, which is currently only
required for pngstruct.h and can therefore be internal.
Revised png_get_int_32 to undo the PNG two's complement representation of
negative numbers.
Version 1.5.0beta37 [July 30, 2010]
Added a typecast in png_get_int_32() in png.h and pngrutil.h to avoid
a compiler warning.
Replaced oFFs 0,0 with oFFs -10,20 in pngtest.png
Version 1.5.0beta38 [July 31, 2010]
Implemented remaining "_fixed" functions.
Corrected a number of recently introduced warnings mostly resulting from
safe but uncast assignments to shorter integers. Also added a zlib
VStudio release library project because the latest zlib Official Windows
build does not include such a thing.
Revised png_get_int_16() to be similar to png_get_int_32().
Restored projects/visualc71.
Version 1.5.0beta39 [August 2, 2010]
VisualC/GCC warning fixes, VisualC build fixes
The changes include support for function attributes in VC in addition to
those already present in GCC - necessary because without these some
warnings are unavoidable. Fixes include signed/unsigned fixes in
pngvalid and checks with gcc -Wall -Wextra -Wunused.
VC requires function attributes on function definitions as well as
declarations, PNG_FUNCTION has been added to enable this and the
relevant function definitions changed.
Version 1.5.0beta40 [August 6, 2010]
Correct use of _WINDOWS_ in pngconf.h
Removed png_mem_ #defines; they are no longer used.
Added the sRGB chunk to pngtest.png
Version 1.5.0beta41 [August 11, 2010]
Added the cHRM chunk to pngtest.png
Don't try to use version-script with cygwin/mingw.
Revised contrib/gregbook to work under cygwin/mingw.
Version 1.5.0beta42 [August 18, 2010]
Add .dll.a to the list of extensions to be symlinked by (Yaakov)
Made all API functions that have const arguments and constant string
literal pointers declare them (John Bowler).
Version 1.5.0beta43 [August 20, 2010]
Removed spurious tabs, shorten long lines (no source change)
Also added scripts/chkfmt to validate the format of all the files that can
reasonably be validated (it is suggested to run "make distclean" before
checking, because some machine generated files have long lines.)
Reformatted the CHANGES file to be more consistent throughout.
Made changes to address various issues identified by GCC, mostly
signed/unsigned and shortening problems on assignment but also a few
difficult to optimize (for GCC) loops.
Fixed non-GCC fixed point builds. In png.c a declaration was misplaced
in an earlier update. Fixed to declare the auto variables at the head.
Use cexcept.h in pngvalid.c.
Version 1.5.0beta44 [August 24, 2010]
Updated CMakeLists.txt to use CMAKE_INSTALL_LIBDIR variable; useful for
installing libpng in /usr/lib64 (Funda Wang).
Revised CMakeLists.txt to put the man pages in share/man/man* not man/man*
Revised CMakeLists.txt to make symlinks instead of copies when installing.
Changed PNG_LIB_NAME from pngNN to libpngNN in CMakeLists.txt (Philip Lowman)
Implemented memory checks within pngvalid
Reformatted/rearranged pngvalid.c to assist use of progressive reader.
Check interlaced images in pngvalid
Clarified pngusr.h comments in pnglibconf.dfa
Simplified the pngvalid error-handling code now that cexcept.h is in place.
Implemented progressive reader in pngvalid.c for standard tests
Implemented progressive read in pngvalid.c gamma tests
Turn on progressive reader in pngvalid.c by default and tidy code.
Version 1.5.0beta45 [August 26, 2010]
Added an explicit make step to projects/vstudio for pnglibconf.h
Also corrected zlib.vcxproj into which Visual Studio had introduced
what it calls an "authoring error". The change to make pnglibconf.h
simply copies the file; in the future it may actually generate the
file from scripts/pnglibconf.dfa as the other build systems do.
Changed pngvalid to work when floating point APIs are disabled
Renamed the prebuilt scripts/pnglibconf.h to scripts/pnglibconf.h.prebuilt
in pngpriv.h in case the user neglected to define them in their pngusr.h
Version 1.5.0beta46 [August 28, 2010]
Added new private header files to libpng_sources in CMakeLists.txt
Added PNG_READ_16BIT, PNG_WRITE_16BIT, and PNG_16BIT options.
Added reference to scripts/pnglibconf.h.prebuilt in the visualc71 project.
Version 1.5.0beta47 [September 11, 2010]
Fixed a number of problems with 64-bit compilation reported by Visual
Studio 2010 (John Bowler).
Version 1.5.0beta48 [October 4, 2010]
Updated CMakeLists.txt (Philip Lowman).
Revised to recognize and use $AUTOCONF, $AUTOMAKE, $AUTOHEADER,
Fixed problem with symbols creation in which was assuming that
all versions of ccp write to standard output by default (Martin Banky). The
bug was introduced in libpng-1.2.9beta5.
Removed unused mkinstalldirs.
Version 1.5.0beta49 [October 8, 2010]
Undid revision of 1.5.0beta48.
Version 1.5.0beta50 [October 14, 2010]
Revised to account for mkinstalldirs being removed.
Added some "(unsigned long)" typecasts in printf statements in pngvalid.c.
Suppressed a compiler warning in png_handle_sPLT().
Check for out-of-range text compression mode in png_set_text().
Version 1.5.0beta51 [October 15, 2010]
Changed embedded dates to "(PENDING RELEASE) in beta releases (and future
rc releases) to minimize the difference between releases.
Version 1.5.0beta52 [October 16, 2010]
Restored some of the embedded dates (in png.h, png.c, documentation, etc.)
Version 1.5.0beta53 [October 18, 2010]
Updated INSTALL to mention using "make maintainer-clean" and to remove
obsolete statement about a custom
Disabled "color-tests" by default in so it will work with
automake versions earlier than 1.11.1
Use document name "libpng-manual.txt" instead of "libpng-<version>.txt"
to simplify version differences.
Removed obsolete remarks about setjmp handling from INSTALL.
Revised and renamed the typedef in png.h and png.c that was designed
to catch library and header mismatch.
Version 1.5.0beta54 [November 10, 2010]
Require 48 bytes, not 64 bytes, for big_row_buf in overflow checks.
Used a consistent structure for the pngget.c functions.
Version 1.5.0beta55 [November 21, 2010]
Revised png_get_uint_32, png_get_int_32, png_get_uint_16 (Cosmin)
Moved reading of file signature into png_read_sig (Cosmin)
Fixed atomicity of chunk header serialization (Cosmin)
Added test for io_state in pngtest.c (Cosmin)
Added "#!/bin/sh" at the top of contrib/pngminim/*/ scripts.
Changes to remove gcc warnings (John Bowler)
Certain optional gcc warning flags resulted in warnings in libpng code.
With these changes only -Wconversion and -Wcast-qual cannot be turned on.
Changes are trivial rearrangements of code. -Wconversion is not possible
for pngrutil.c (because of the widespread use of += et al on variables
smaller than (int) or (unsigned int)) and -Wcast-qual is not possible
with pngwio.c and pngwutil.c because the 'write' callback and zlib
compression both fail to declare their input buffers with 'const'.
Version 1.5.0beta56 [December 7, 2010]
Added the private PNG_UNUSED() macro definition in pngpriv.h.
Added some commentary about PNG_EXPORT in png.h and pngconf.h
Revised PNG_EXPORT() macro and added PNG_EXPORTA() macro, with the
objective of simplifying and improving the cosmetic appearance of png.h.
Fixed some incorrect "=" macro names in pnglibconf.dfa
Included documentation of changes in 1.5.0 from 1.4.x in libpng-manual.txt
Version 1.5.0beta57 [December 9, 2010]
Documented the pngvalid gamma error summary with additional comments and
print statements.
Improved missing symbol handling in checksym.awk; symbols missing in both
the old and new files can now be optionally ignored, treated as errors
or warnings.
Removed references to pngvcrd.c and pnggccrd.c from the vstudio project.
Updated "libpng14" to "libpng15" in the visualc71 project.
Enabled the strip16 tests in pngvalid.`
Don't display test results (except PASS/FAIL) when running "make test".
Instead put them in pngtest-log.txt
Added "--with-zprefix=<string>" to
Updated the prebuilt configuration files to autoconf version 2.68
Version 1.5.0beta58 [December 19, 2010]
Fixed interlace image handling and add test cases (John Bowler)
Fixed the clean rule in to remove pngtest-log.txt
Made minor changes to work around warnings in gcc 3.4
Version 1.5.0rc01 [December 27, 2010]
No changes.
Version 1.5.0rc02 [December 27, 2010]
Eliminated references to the scripts/*.def files in project/visualc71.
Version 1.5.0rc03 [December 28, 2010]
Eliminated scripts/*.def and revised accordingly
Version 1.5.0rc04 [December 29, 2010]
Fixed bug in background transformation handling in pngrtran.c (it was
looking for the flag in png_ptr->transformations instead of in
png_ptr->flags) (David Raymond).
Version 1.5.0rc05 [December 31, 2010]
Fixed typo in a comment in CMakeLists.txt (libpng14 => libpng15) (Cosmin)
Version 1.5.0rc06 [January 4, 2011]
Changed the new configure option "zprefix=string" to "zlib-prefix=string"
Version 1.5.0rc07 [January 4, 2011]
Updated copyright year.
Version 1.5.0 [January 6, 2011]
No changes.
version 1.5.1beta01 [January 8, 2011]
Added description of png_set_crc_action() to the manual.
Added a note in the manual that the type of the iCCP profile was changed
from png_charpp to png_bytepp in png_get_iCCP(). This change happened
in version 1.5.0beta36 but is not noted in the CHANGES. Similarly,
it was changed from png_charpp to png_const_bytepp in png_set_iCCP().
Ensure that png_rgb_to_gray ignores palette mapped images, if libpng
internally happens to call it with one, and fixed a failure to handle
palette mapped images correctly. This fixes CVE-2690.
Version 1.5.1beta02 [January 14, 2011]
Fixed a bug in handling of interlaced images (bero at
Updated CMakeLists.txt (Clifford Yapp)
Version 1.5.1beta03 [January 14, 2011]
Fixed typecasting of some png_debug() statements (Cosmin)
Version 1.5.1beta04 [January 16, 2011]
Updated documentation of png_set|get_tRNS() (Thomas Klausner).
Mentioned in the documentation that applications must #include "zlib.h"
if they need access to anything in zlib.h, and that a number of
macros such as png_memset() are no longer accessible by applications.
Corrected pngvalid gamma test "sample" function to access all of the color
samples of each pixel, instead of sampling the red channel three times.
Prefixed variable names index, div, exp, gamma with "png_" to avoid "shadow"
warnings, and (mistakenly) changed png_exp() to exp().
Version 1.5.1beta05 [January 16, 2011]
Changed variable names png_index, png_div, png_exp, and png_gamma to
char_index, divisor, exp_b10, and gamma_val, respectively, and
changed exp() back to png_exp().
Version 1.5.1beta06 [January 20, 2011]
Prevent png_push_crc_skip() from hanging while reading an unknown chunk
or an over-large compressed zTXt chunk with the progressive reader.
Eliminated more GCC "shadow" warnings.
Revised png_fixed() in png.c to avoid compiler warning about reaching the
end without returning anything.
Version 1.5.1beta07 [January 22, 2011]
In the manual, describe the png_get_IHDR() arguments in the correct order.
Added const_png_structp and const_png_infop types, and used them in
prototypes for most png_get_*() functions.
Version 1.5.1beta08 [January 23, 2011]
Added png_get_io_chunk_type() and deprecated png_get_io_chunk_name()
Added synopses for the IO_STATE functions and other missing synopses
to the manual. Removed the synopses from libpngpf.3 because they
were out of date and no longer useful. Better information can be
obtained by reading the prototypes and comments in pngpriv.h
Attempted to fix cpp on Solaris with S. Studio 12 cc, fix build
Added a make macro DFNCPP that is a CPP that will accept the tokens in
a .dfn file and adds configure stuff to test for such a CPP. ./configure
should fail if one is not available.
Corrected const_png_ in png.h to png_const_ to avoid polluting the namespace.
Added png_get_current_row_number and png_get_current_pass_number for the
benefit of the user transform callback.
Added png_process_data_pause and png_process_data_skip for the benefit of
progressive readers that need to stop data processing or want to optimize
skipping of unread data (e.g., if the reader marks a chunk to be skipped.)
Version 1.5.1beta09 [January 24, 2011]
Enhanced pngvalid, corrected an error in gray_to_rgb, corrected doc error.
pngvalid contains tests of transforms, which tests are currently disabled
because they are incompletely tested. gray_to_rgb was failing to expand
the bit depth for smaller bit depth images; this seems to be a long
standing error and resulted, apparently, in invalid output
(CVE-2011-0408, CERT VU#643140). The documentation did not accurately
describe what libpng really does when converting RGB to gray.
Version 1.5.1beta10 [January 27, 2010]
Fixed incorrect examples of callback prototypes in the manual, that were
introduced in libpng-1.0.0.
In addition the order of the png_get_uint macros with respect to the
relevant function definitions has been reversed. This helps the
preprocessing of the symbol files be more robust. Furthermore, the
symbol file preprocessing now uses -DPNG_NO_USE_READ_MACROS even when
the library may actually be built with PNG_USE_READ_MACROS; this stops
the read macros interfering with the symbol file format.
Made the manual, synopses, and function prototypes use the function
argument names file_gamma, int_file_gamma, and srgb_intent consistently.
Version 1.5.1beta11 [January 28, 2011]
Changed PNG_UNUSED from "param=param;" to "{if(param){}}".
Corrected local variable type in new API png_process_data_skip()
The type was self-evidently incorrect but only causes problems on 64-bit
Added transform tests to pngvalid and simplified the arguments.
Version 1.5.1rc01 [January 29, 2011]
No changes.
Version 1.5.1rc02 [January 31, 2011]
Added a request in the manual that applications do not use "png_" or
"PNG_" to begin any of their own symbols.
Changed PNG_UNUSED to "(void)param;" and updated the commentary in pngpriv.h
Version 1.5.1 [February 3, 2011]
No changes.
Version 1.5.2beta01 [February 13, 2011]
More -Wshadow fixes for older gcc compilers. Older gcc versions apparently
check formal parameters names in function declarations (as well as
definitions) to see if they match a name in the global namespace.
Revised PNG_EXPORTA macro to not use an empty parameter, to accommodate the
old VisualC++ preprocessor.
Turned on interlace handling in png_read_png().
Fixed gcc pedantic warnings.
Handle longjmp in Cygwin.
Fixed png_get_current_row_number() in the interlaced case.
Cleaned up ALPHA flags and transformations.
Implemented expansion to 16 bits.
Version 1.5.2beta02 [February 19, 2011]
Fixed mistake in the descriptions of user read_transform and write_transform
function prototypes in the manual. The row_info struct is png_row_infop.
Reverted png_get_current_row_number() to previous (1.5.2beta01) behavior.
Corrected png_get_current_row_number documentation
Fixed the read/write row callback documentation.
This documents the current behavior, where the callback is called after
every row with information pertaining to the next row.
Version 1.5.2beta03 [March 3, 2011]
Fixed scripts/makefile.vcwin32
Updated contrib/pngsuite/README to add the word "modify".
Define PNG_ALLOCATED to blank when _MSC_VER<1300.
Version 1.5.2rc01 [March 19, 2011]
Define remaining attributes to blank when MSC_VER<1300.
ifdef out mask arrays in pngread.c when interlacing is not supported.
Version 1.5.2rc02 [March 22, 2011]
Added a hint to try CPP=/bin/cpp if "cpp -E" fails in scripts/pnglibconf.mak
and in contrib/pngminim/*/makefile, eg., on SunOS 5.10, and removed "strip"
from the makefiles.
Fixed a bug (present since libpng-1.0.7) that makes png_handle_sPLT() fail
to compile when PNG_NO_POINTER_INDEXING is defined (Chubanov Kirill)
Version 1.5.2rc03 [March 24, 2011]
Don't include standard header files in png.h while building the symbol table,
to avoid cpp failure on SunOS (introduced PNG_BUILDING_SYMBOL_TABLE macro).
Version 1.5.2 [March 31, 2011]
No changes.
Version 1.5.3beta01 [April 1, 2011]
Re-initialize the zlib compressor before compressing non-IDAT chunks.
Added API functions (png_set_text_compression_level() and four others) to
set parameters for zlib compression of non-IDAT chunks.
Version 1.5.3beta02 [April 3, 2011]
Updated scripts/symbols.def with new API functions.
Only compile the new zlib re-initializing code when text or iCCP is
Improved the optimization of the zlib CMF byte (see libpng-1.2.6beta03).
Optimize the zlib CMF byte in non-IDAT compressed chunks
Version 1.5.3beta03 [April 16, 2011]
Fixed gcc -ansi -pedantic compile. A strict ANSI system does not have
snprintf, and the "__STRICT_ANSI__" detects that condition more reliably
than __STDC__ (John Bowler).
Removed the PNG_PTR_NORETURN attribute because it too dangerous. It tells
the compiler that a user supplied callback (the error handler) does not
return, yet there is no guarantee in practice that the application code
will correctly implement the error handler because the compiler only
issues a warning if there is a mistake (John Bowler).
Removed the no-longer-used PNG_DEPSTRUCT macro.
Updated the zlib version to 1.2.5 in the VStudio project.
Fixed 64-bit builds where png_uint_32 is smaller than png_size_t in
pngwutil.c (John Bowler).
Fixed bug with stripping the filler or alpha channel when writing, that
was introduced in libpng-1.5.2beta01 (bug report by Andrew Church).
Version 1.5.3beta04 [April 27, 2011]
Updated pngtest.png with the new zlib CMF optimization.
Cleaned up conditional compilation code and of background/gamma handling
Internal changes only except a new option to avoid compiling the
png_build_grayscale_palette API (which is not used at all internally.)
The main change is to move the transform tests (READ_TRANSFORMS,
WRITE_TRANSFORMS) up one level to the caller of the APIs. This avoids
calls to spurious functions if all transforms are disabled and slightly
simplifies those functions. Pngvalid modified to handle this.
A minor change is to stop the strip_16 and expand_16 interfaces from
disabling each other; this allows the future alpha premultiplication
code to use 16-bit intermediate values while still producing 8-bit output.
png_do_background and png_do_gamma have been simplified to take a single
pointer to the png_struct rather than pointers to every item required
from the png_struct. This makes no practical difference to the internal
A serious bug in the pngvalid internal routine 'standard_display_init' has
been fixed - this failed to initialize the red channel and accidentally
initialized the alpha channel twice.
Changed png_struct jmp_buf member name from png_jmpbuf to tmp_jmpbuf to
avoid a possible clash with the png_jmpbuf macro on some platforms.
Version 1.5.3beta05 [May 6, 2011]
Added the "_POSIX_SOURCE" feature test macro to ensure libpng sees the
correct API. _POSIX_SOURCE is defined in pngpriv.h, pngtest.c and
pngvalid.c to ensure that POSIX conformant systems disable non-POSIX APIs.
Removed png_snprintf and added formatted warning messages. This change adds
internal APIs to allow png_warning messages to have parameters without
requiring the host OS to implement snprintf. As a side effect the
dependency of the tIME-supporting RFC1132 code on stdio is removed and
PNG_NO_WARNINGS does actually work now.
Pass "" instead of '\0' to png_default_error() in png_err(). This mistake
was introduced in libpng-1.2.20beta01. This fixes CVE-2011-2691.
Added PNG_WRITE_OPTIMIZE_CMF_SUPPORTED macro to make the zlib "CMF" byte
optimization configurable.
IDAT compression failed if preceded by a compressed text chunk (bug
introduced in libpng-1.5.3beta01-02). This was because the attempt to
reset the zlib stream in png_write_IDAT happened after the first IDAT
chunk had been deflated - much too late. In this change internal
functions were added to claim/release the z_stream and, hopefully, make
the code more robust. Also deflateEnd checking is added - previously
libpng would ignore an error at the end of the stream.
Version 1.5.3beta06 [May 8, 2011]
Removed the -D_ALL_SOURCE from definitions for AIX in CMakeLists.txt
Implemented premultiplied alpha support: png_set_alpha_mode API
Version 1.5.3beta07 [May 11, 2011]
Added expand_16 support to the high level interface.
Added named value and 'flag' gamma support to png_set_gamma. Made a minor
change from the previous (unreleased) ABI/API to hide the exact value used
for Macs - it's not a good idea to embed this in the ABI!
Moved macro definitions for PNG_HAVE_IHDR, PNG_HAVE_PLTE, and PNG_AFTER_IDAT
from pngpriv.h to png.h because they must be visible to applications
that call png_set_unknown_chunks().
Check for up->location !PNG_AFTER_IDAT when writing unknown chunks
before IDAT.
Version 1.5.3beta08 [May 16, 2011]
Improved "pngvalid --speed" to exclude more of pngvalid from the time.
Documented png_set_alpha_mode(), other changes in libpng.3/libpng-manual.txt
The cHRM chunk now sets the defaults for png_set_rgb_to_gray() (when negative
parameters are supplied by the caller), while in the absence of cHRM
sRGB/Rec 709 values are still used. This introduced a divide-by-zero
bug in png_handle_cHRM().
The bKGD chunk no longer overwrites the background value set by
png_set_background(), allowing the latter to be used before the file
header is read. It never performed any useful function to override
the default anyway.
Added memory overwrite and palette image checks to pngvalid.c
Previously palette image code was poorly checked. Since the transformation
code has a special palette path in most cases this was a severe weakness.
Minor cleanup and some extra checking in pngrutil.c and pngrtran.c. When
expanding an indexed image, always expand to RGBA if transparency is
Version 1.5.3beta09 [May 17, 2011]
Reversed earlier 1.5.3 change of transformation order; move png_expand_16
back where it was. The change doesn't work because it requires 16-bit
gamma tables when the code only generates 8-bit ones. This fails
silently; the libpng code just doesn't do any gamma correction. Moving
the tests back leaves the old, inaccurate, 8-bit gamma calculations, but
these are clearly better than none!
Version 1.5.3beta10 [May 20, 2011]
png_set_background() and png_expand_16() did not work together correctly.
This problem is present in 1.5.2; if png_set_background is called with
need_expand false and the matching 16 bit color libpng erroneously just
treats it as an 8-bit color because of where png_do_expand_16 is in the
transform list. This simple fix reduces the supplied colour to 8-bits,
so it gets smashed, but this is better than the current behavior.
Added tests for expand16, more fixes for palette image tests to pngvalid.
Corrects the code for palette image tests and disables attempts to
validate palette colors.
Version 1.5.3rc01 [June 3, 2011]
No changes.
Version 1.5.3rc02 [June 8, 2011]
Fixed uninitialized memory read in png_format_buffer() (Bug report by
Frank Busse, CVE-2011-2501, related to CVE-2004-0421).
Version 1.5.3beta11 [June 11, 2011]
Fixed png_handle_sCAL which is broken in 1.5. This fixes CVE 2011-2692.
Added sCAL to pngtest.png
Revised documentation about png_set_user_limits() to say that it also affects
png writing.
Revised handling of png_set_user_limits() so that it can increase the
limit beyond the PNG_USER_WIDTH|HEIGHT_MAX; previously it could only
reduce it.
Make the 16-to-8 scaling accurate. Dividing by 256 with no rounding is
wrong (high by one) 25% of the time. Dividing by 257 with rounding is
wrong in 128 out of 65536 cases. Getting the right answer all the time
without division is easy.
Added projects/owatcom, an IDE project for OpenWatcom to replace
scripts/makefile.watcom. This project works with OpenWatcom 1.9. The
IDE autogenerates appropriate makefiles ( for batch processing.
The project is configurable, unlike the Visual Studio project, so long
as the developer has an awk.
Changed png_set_gAMA to limit the gamma value range so that the inverse
of the stored value cannot overflow the fixed point representation,
and changed other things OpenWatcom warns about.
Revised pngvalid.c to test PNG_ALPHA_MODE_SUPPORTED correctly. This allows
pngvalid to build when ALPHA_MODE is not supported, which is required if
it is to build on libpng 1.4.
Removed string/memory macros that are no longer used and are not
necessarily fully supportable, particularly png_strncpy and png_snprintf.
Added log option to pngvalid.c and attempted to improve gamma messages.
Version 1.5.3 [omitted]
People found the presence of a beta release following an rc release
to be confusing; therefore we bump the version to libpng-1.5.4beta01
and there will be no libpng-1.5.3 release.
Version 1.5.4beta01 [June 14, 2011]
Made it possible to undefine PNG_READ_16_TO_8_ACCURATE_SCALE_SUPPORTED
to get the same (inaccurate) output as libpng-1.5.2 and earlier.
outside of an unknown-chunk block in png.h because they are also
needed for other uses.
Version 1.5.4beta02 [June 14, 2011]
Fixed and clarified LEGACY 16-to-8 scaling code.
Added png_set_chop_16() API, to match inaccurate results from previous
libpng versions.
Removed the ACCURATE and LEGACY options (they are no longer useable)
Use the old scaling method for background if png_set_chop_16() was
Made png_set_chop_16() API removeable by disabling PNG_CHOP_16_TO_8_SUPPORTED
Version 1.5.4beta03 [June 15, 2011]
Fixed a problem in png_do_expand_palette() exposed by optimization in
Also removed a spurious and confusing "trans" member ("trans") from png_info.
The palette expand optimization prevented expansion to an intermediate RGBA
form if tRNS was present but alpha was marked to be stripped; this exposed
a check for tRNS in png_do_expand_palette() which is inconsistent with the
code elsewhere in libpng.
Correction to the expand_16 code; removed extra instance of
png_set_scale_16_to_8 from pngpriv.h
Version 1.5.4beta04 [June 16, 2011]
Added a missing "#ifdef PNG_READ_BACKGROUND_SUPPORTED/#endif" in pngrtran.c
Added PNG_TRANSFORM_CHOP_16 to the high-level read transforms.
Made PNG_READ_16_TO_8_ACCURATE_SCALE configurable again. If this is
not enabled, png_set_strip_16() and png_do_scale_16_to_8() aren't built.
Revised contrib/visupng, gregbook, and pngminim to demonstrate chop_16_to_8
Version 1.5.4beta05 [June 16, 2011]
Renamed png_set_strip_16() to png_set_scale_16() and renamed
png_set_chop_16() to png_set_strip(16) in an attempt to minimize the
behavior changes between libpng14 and libpng15.
Version 1.5.4beta06 [June 18, 2011]
Fixed new bug that was causing both strip_16 and scale_16 to be applied.
Version 1.5.4beta07 [June 19, 2011]
Fixed pngvalid, simplified macros, added checking for 0 in sCAL.
The ACCURATE scale macro is no longer defined in 1.5 - call the
png_scale_16_to_8 API. Made sure that PNG_READ_16_TO_8 is still defined
if the png_strip_16_to_8 API is present. png_check_fp_number now
maintains some state so that positive, negative and zero values are
identified. sCAL uses these to be strictly spec conformant.
Version 1.5.4beta08 [June 23, 2011]
Fixed pngvalid if ACCURATE_SCALE is defined.
Updated scripts/pnglibconf.h.prebuilt.
Version 1.5.4rc01 [June 30, 2011]
Define PNG_ALLOCATED to "restrict" only if MSC_VER >= 1400.
Version 1.5.4 [July 7, 2011]
No changes.
Version 1.5.5beta01 [July 13, 2011]
Fixed some typos and made other minor changes in the manual.
Updated contrib/pngminus/makefile.std (Samuli Souminen)
Version 1.5.5beta02 [July 14, 2011]
Revised and to look in the right directory for
Version 1.5.5beta03 [July 27, 2011]
Enabled compilation with g++ compiler. This compiler does not recognize
the file extension, so it always compiles with C++ rules. Made minor
changes to pngrutil.c to cast results where C++ expects it but C does not.
Minor editing of libpng.3 and libpng-manual.txt.
Version 1.5.5beta04 [July 29, 2011]
Revised CMakeLists.txt (Clifford Yapp)
Updated commentary about the png_rgb_to_gray() default coefficients
in the manual and in pngrtran.c
Version 1.5.5beta05 [August 17, 2011]
Prevent unexpected API exports from non-libpng DLLs on Windows. The "_DLL"
is removed from the test of whether a DLL is being built (this erroneously
caused the libpng APIs to be marked as DLL exports in static builds under
Microsoft Visual Studio). Almost all of the libpng building configuration
is moved from pngconf.h to pngpriv.h, but PNG_DLL_EXPORT remains in
pngconf.h, though, so that it is colocated with the import definition (it
is no longer used anywhere in the installed headers). The VStudio project
definitions have been cleaned up: "_USRDLL" has been removed from the
static library builds (this was incorrect), and PNG_USE_DLL has been added
to pngvalid to test the functionality (pngtest does not supply it,
deliberately). The spurious "_EXPORTS" has been removed from the
libpng build (all these errors were a result of copy/paste between project
Added new types and internal functions for CIE RGB end point handling to
pngpriv.h (functions yet to be implemented).
Version 1.5.5beta06 [August 26, 2011]
Ensure the CMAKE_LIBRARY_OUTPUT_DIRECTORY is set in CMakeLists.txt
(Clifford Yap)
Fixes to rgb_to_gray and cHRM XYZ APIs (John Bowler):
The rgb_to_gray code had errors when combined with gamma correction.
Some pixels were treated as true grey when they weren't and such pixels
and true grey ones were not gamma corrected (the original value of the
red component was used instead). APIs to get and set cHRM using color
space end points have been added and the rgb_to_gray code that defaults
based on cHRM, and the divide-by-zero bug in png_handle_cHRM (CERT
VU#477046, CVE-2011-3328, introduced in 1.5.4) have been corrected.
A considerable number of tests has been added to pngvalid for the
rgb_to_gray transform.
Arithmetic errors in rgb_to_gray whereby the calculated gray value was
truncated to the bit depth rather than rounded have been fixed except in
the 8-bit non-gamma-corrected case (where consistency seems more important
than correctness.) The code still has considerable inaccuracies in the
8-bit case because 8-bit linear arithmetic is used.
Version 1.5.5beta07 [September 7, 2011]
Added "$(ARCH)" option to makefile.darwin
Added SunOS support to and
Changed png_chunk_benign_error() to png_warning() in png.c, in
Version 1.5.5beta08 [September 10, 2011]
Fixed 64-bit compilation errors (gcc). The errors fixed relate
to conditions where types that are 32 bits in the GCC 32-bit
world (uLong and png_size_t) become 64 bits in the 64-bit
world. This produces potential truncation errors which the
compiler correctly flags.
Relocated new HAVE_SOLARIS_LD definition in
Constant changes for 64-bit compatibility (removal of L suffixes). The
16-bit cases still use "L" as we don't have a 16-bit test system.
Version 1.5.5rc01 [September 15, 2011]
Removed "L" suffixes in pngpriv.h
Version 1.5.5 [September 22, 2011]
No changes.
Version 1.5.6beta01 [September 22, 2011]
Fixed some 64-bit type conversion warnings in pngrtran.c
Moved row_info from png_struct to a local variable.
The various interlace mask arrays have been made into arrays of
bytes and made PNG_CONST and static (previously some arrays were
marked PNG_CONST and some weren't).
Additional checks have been added to the transform code to validate the
pixel depths after the transforms on both read and write.
Removed some redundant code from pngwrite.c, in png_destroy_write_struct().
Changed chunk reading/writing code to use png_uint_32 instead of png_byte[4].
This removes the need to allocate temporary strings for chunk names on
the stack in the read/write code. Unknown chunk handling still uses the
string form because this is exposed in the API.
Version 1.5.6beta02 [September 26, 2011]
Added a note in the manual the png_read_update_info() must be called only
once with a particular info_ptr.
Fixed a typo in the definition of the new PNG_STRING_FROM_CHUNK(s,c) macro.
Version 1.5.6beta03 [September 28, 2011]
Revised to report FAIL when pngtest fails.
Added "--strict" option to pngtest, to report FAIL when the failure is
only because the resulting valid files are different.
Revised CMakeLists.txt to work with mingw and removed some material from
CMakeLists.txt that is no longer useful in libpng-1.5.
Version 1.5.6beta04 [October 5, 2011]
Fixed typo in and ("-M Wl" should be "-M -Wl")."
Version 1.5.6beta05 [October 12, 2011]
Speed up png_combine_row() for interlaced images. This reduces the generality
of the code, allowing it to be optimized for Adam7 interlace. The masks
passed to png_combine_row() are now generated internally, avoiding
some code duplication and localizing the interlace handling somewhat.
Align png_struct::row_buf - previously it was always unaligned, caused by
a bug in the code that attempted to align it; the code needs to subtract
one from the pointer to take account of the filter byte prepended to
each row.
Optimized png_combine_row() when rows are aligned. This gains a small
percentage for 16-bit and 32-bit pixels in the typical case where the
output row buffers are appropriately aligned. The optimization was not
previously possible because the png_struct buffer was always misaligned.
Fixed bug in png_write_chunk_header() debug print, introduced in 1.5.6beta01.
Version 1.5.6beta06 [October 17, 2011]
Removed two redundant tests for uninitialized row.
Fixed a relatively harmless memory overwrite in compressed text writing
with a 1 byte zlib buffer.
Add ability to call png_read_update_info multiple times to pngvalid.c.
Fixes for multiple calls to png_read_update_info. These fixes attend to
most of the errors revealed in pngvalid, however doing the gamma work
twice results in inaccuracies that can't be easily fixed. There is now
a warning in the code if this is going to happen.
Turned on multiple png_read_update_info in pngvalid transform tests.
Prevent libpng from overwriting unused bits at the end of the image when
it is not byte aligned, while reading. Prior to libpng-1.5.6 libpng would
overwrite the partial byte at the end of each row if the row width was not
an exact multiple of 8 bits and the image is not interlaced.
Version 1.5.6beta07 [October 21, 2011]
Made png_ptr->prev_row an aligned pointer into png_ptr->big_prev_row
(Mans Rullgard).
Version 1.5.6rc01 [October 26, 2011]
Changed misleading "Missing PLTE before cHRM" warning to "Out of place cHRM"
Version 1.5.6rc02 [October 27, 2011]
Added LSR() macro to defend against buggy compilers that evaluate non-taken
code branches and complain about out-of-range shifts.
Version 1.5.6rc03 [October 28, 2011]
Renamed the LSR() macro to PNG_LSR() and added PNG_LSL() macro.
Fixed compiler warnings with Intel and MSYS compilers. The logical shift
fix for Microsoft Visual C is required by other compilers, so this
enables that fix for all compilers when using compile-time constants.
Under MSYS 'byte' is a name declared in a system header file, so we
changed the name of a local variable to avoid the warnings that result.
Added #define PNG_ALIGN_TYPE PNG_ALIGN_NONE to contrib/pngminim/*/pngusr.h
Version 1.5.6 [November 3, 2011]
No changes.
Version 1.5.7beta01 [November 4, 2011]
Added support for ARM processor, when decoding all PNG up-filtered rows
and any other-filtered rows with 3 or 4 bytes per pixel (Mans Rullgard).
Fixed bug in pngvalid on early allocation failure; fixed type cast in
pngmem.c; pngvalid would attempt to call png_error() if the allocation
of a png_struct or png_info failed. This would probably have led to a
crash. The pngmem.c implementation of png_malloc() included a cast
to png_size_t which would fail on large allocations on 16-bit systems.
Fix for the preprocessor of the Intel C compiler. The preprocessor
splits adjacent @ signs with a space; this changes the concatenation
token from @-@-@ to PNG_JOIN; that should work with all compiler
Paeth filter speed improvements from work by Siarhei Siamashka. This
changes the 'Paeth' reconstruction function to improve the GCC code
generation on x86. The changes are only part of the suggested ones;
just the changes that definitely improve speed and remain simple.
The changes also slightly increase the clarity of the code.
Version 1.5.7beta02 [November 11, 2011]
Check compression_type parameter in png_get_iCCP and remove spurious
casts. The compression_type parameter is always assigned to, so must
be non-NULL. The cast of the profile length potentially truncated the
value unnecessarily on a 16-bit int system, so the cast of the (byte)
compression type to (int) is specified by ANSI-C anyway.
Fixed FP division by zero in pngvalid.c; the 'test_pixel' code left
the sBIT fields in the test pixel as 0, which resulted in a floating
point division by zero which was irrelevant but causes systems where
FP exceptions cause a crash. Added code to pngvalid to turn on FP
exceptions if the appropriate glibc support is there to ensure this is
tested in the future.
Updated scripts/pnglibconf.mak and scripts/makefile.std to handle the
new PNG_JOIN macro.
Added versioning to pnglibconf.h comments.
Simplified read/write API initial version; basic read/write tested on
a variety of images, limited documentation (in the header file.)
Installed more accurate linear to sRGB conversion tables. The slightly
modified tables reduce the number of 16-bit values that
convert to an off-by-one 8-bit value. The "makesRGB.c" code that was used
to generate the tables is now in a contrib/sRGBtables sub-directory.
Version 1.5.7beta03 [November 17, 2011]
Removed PNG_CONST from the sRGB table declarations in pngpriv.h and png.c
Added run-time detection of NEON support.
Added contrib/libtests; includes simplified API test and timing test and
a color conversion utility for rapid checking of failed 'pngstest' results.
Multiple transform bug fixes plus a work-round for double gamma correction.
libpng does not support more than one transform that requires linear data
at once - if this is tried typically the results is double gamma
correction. Since the simplified APIs can need rgb to gray combined with
a compose operation it is necessary to do one of these outside the main
libpng transform code. This check-in also contains fixes to various bugs
in the simplified APIs themselves and to some bugs in compose and rgb to
gray (on palette) itself.
Fixes for C++ compilation using g++ When libpng source is compiled
using g++. The compiler imposes C++ rules on the C source; thus it
is desirable to make the source work with either C or C++ rules
without throwing away useful error information. This change adds
png_voidcast to allow C semantic (void*) cases or the corresponding
C++ static_cast operation, as appropriate.
Added --noexecstack to assembler file compilation. GCC does not set
this on assembler compilation, even though it does on C compilation.
This creates security issues if assembler code is enabled; the
work-around is to set it by default in the flags for $(CCAS)
Work around compilers that don't support declaration of const data. Some
compilers fault 'extern const' data declarations (because the data is
not initialized); this turns on const-ness only for compilers where
this is known to work.
Version 1.5.7beta04 [November 17, 2011]
Since the gcc driver does not recognize the --noexecstack flag, we must
use the -Wa prefix to have it passed through to the assembler.
Also removed a duplicate setting of this flag.
Added files that were omitted from the libpng-1.5.7beta03 zip distribution.
Version 1.5.7beta05 [November 25, 2011]
Removed "zTXt" from warning in generic chunk decompression function.
Validate time settings passed to png_set_tIME() and png_convert_to_rfc1123()
(Frank Busse). Note: This prevented CVE-2015-7981 from affecting
libpng-1.5.7 and later.
Added MINGW support to CMakeLists.txt
Reject invalid compression flag or method when reading the iTXt chunk.
Backed out 'simplified' API changes. The API seems too complex and there
is a lack of consensus or enthusiasm for the proposals. The API also
reveals significant bugs inside libpng (double gamma correction and the
known bug of being unable to retrieve a corrected palette). It seems
better to wait until the bugs, at least, are corrected.
Moved pngvalid.c into contrib/libtests
Rebuilt, configure, etc., with autoconf-2.68
Version 1.5.7rc01 [December 1, 2011]
Replaced an "#if" with "#ifdef" in pngrtran.c
Revised #if PNG_DO_BC block in png.c (use #ifdef and add #else)
Version 1.5.7rc02 [December 5, 2011]
Revised project files and contrib/pngvalid/pngvalid.c to account for
the relocation of pngvalid into contrib/libtests.
Revised pngconf.h to use " __declspec(restrict)" only when MSC_VER >= 1400,
as in libpng-1.5.4.
Put CRLF line endings in the owatcom project files.
Version 1.5.7rc03 [December 7, 2011]
Updated CMakeLists.txt to account for the relocation of pngvalid.c
Version 1.5.7 [December 15, 2011]
Minor fixes to pngvalid.c for gcc 4.6.2 compatibility to remove warnings
reported by earlier versions.
Fixed minor memset/sizeof errors in pngvalid.c.
Version 1.6.0beta01 [December 15, 2011]
Removed machine-generated configure files from the GIT repository (they will
continue to appear in the tarball distributions and in the libpng15 and
earlier GIT branches).
Restored the new 'simplified' API, which was started in libpng-1.5.7beta02
but later deleted from libpng-1.5.7beta05.
Added example programs for the new 'simplified' API.
Added ANSI-C (C90) headers and require them, and take advantage of the
change. Also fixed some of the projects/* and contrib/* files that needed
updates for libpng16 and the move of pngvalid.c.
With this change the required ANSI-C header files are assumed to exist: the
implementation must provide float.h, limits.h, stdarg.h and stddef.h and
libpng relies on limits.h and stddef.h existing and behaving as defined
(the other two required headers aren't used). Non-ANSI systems that don't
have stddef.h or limits.h will have to provide an appropriate fake
containing the relevant types and #defines.
Dropped support for 16-bit platforms. The use of FAR/far has been eliminated
and the definition of png_alloc_size_t is now controlled by a flag so
that 'small size_t' systems can select it if necessary. Libpng 1.6 may
not currently work on such systems -- it seems likely that it will
ask 'malloc' for more than 65535 bytes with any image that has a
sufficiently large row size (rather than simply failing to read such
New tools directory containing tools used to generate libpng code.
Fixed race conditions in parallel make builds. With higher degrees of
parallelism during 'make' the use of the same temporary file names such
as 'dfn*' can result in a race where a temporary file from one arm of the
build is deleted or overwritten in another arm. This changes the
temporary files for suffix rules to always use $* and ensures that the
non-suffix rules use unique file names.
Version 1.6.0beta02 [December 21, 2011]
Correct configure builds where build and source directories are separate.
The include path of 'config.h' was erroneously made relative in pngvalid.c
in libpng 1.5.7.
Version 1.6.0beta03 [December 22, 2011]
Start-up code size improvements, error handler flexibility. These changes
alter how the tricky allocation of the initial png_struct and png_info
structures are handled. png_info is now handled in pretty much the same
way as everything else, except that the allocations handle NULL return
silently. png_struct is changed in a similar way on allocation and on
deallocation a 'safety' error handler is put in place (which should never
be required). The error handler itself is changed to permit mismatches
in the application and libpng error buffer size; however, this means a
silent change to the API to return the jmp_buf if the size doesn't match
the size from the libpng compilation; libpng now allocates the memory and
this may fail. Overall these changes result in slight code size
reductions; however, this is a reduction in code that is always executed
so is particularly valuable. Overall on a 64-bit system the libpng DLL
decreases in code size by 1733 bytes. pngerror.o increases in size by
about 465 bytes because of the new functionality.
Added png_convert_to_rfc1123_buffer() and deprecated png_convert_to_rfc1123()
to avoid including a spurious buffer in the png_struct.
Version 1.6.0beta04 [December 30, 2011]
Regenerated configure scripts with automake-1.11.2
Eliminated png_info_destroy(). It is now used only in png.c and only calls
one other internal function and memset().
Enabled png_get_sCAL_fixed() if floating point APIs are enabled. Previously
it was disabled whenever internal fixed point arithmetic was selected,
which meant it didn't exist even on systems where FP was available but not
Added pngvalid.c compile time checks for const APIs.
Implemented 'restrict' for png_info and png_struct. Because of the way
libpng works both png_info and png_struct are always accessed via a
single pointer. This means adding C99 'restrict' to the pointer gives
the compiler some opportunity to optimize the code. This change allows
Moved AC_MSG_CHECKING([if libraries can be versioned]) later to the proper
location in (Gilles Espinasse).
Changed png_memcpy to C assignment where appropriate. Changed all those
uses of png_memcpy that were doing a simple assignment to assignments
(all those cases where the thing being copied is a non-array C L-value).
Added some error checking to png_set_*() routines.
Removed the reference to the non-exported function png_memcpy() from
Fixed the Visual C 64-bit build - it requires jmp_buf to be aligned, but
it had become misaligned.
Revised contrib/pngminus/pnm2png.c to avoid warnings when png_uint_32
and unsigned long are of different sizes.
Version 1.6.0beta05 [January 15, 2012]
Updated manual with description of the simplified API (copied from png.h)
Fix bug in pngerror.c: some long warnings were being improperly truncated
(CVE-2011-3464, bug introduced in libpng-1.5.3beta05).
Version 1.6.0beta06 [January 24, 2012]
Added palette support to the simplified APIs. This commit
changes some of the macro definitions in png.h, app code
may need corresponding changes.
Increased the formatted warning buffer to 192 bytes.
Added color-map support to simplified API. This is an initial version for
review; the documentation has not yet been updated.
Fixed Min/GW uninstall to remove libpng.dll.a
Version 1.6.0beta07 [January 28, 2012]
Eliminated Intel icc/icl compiler warnings. The Intel (GCC derived)
compiler issues slightly different warnings from those issued by the
current vesions of GCC. This eliminates those warnings by
adding/removing casts and small code rewrites.
Updated from autoupdate: added --enable-werror option.
Also some layout regularization and removal of introduced tab characters
(replaced with 3-character indentation). Obsolete macros identified by
autoupdate have been removed; the replacements are all in 2.59 so
the pre-req hasn't been changed. --enable-werror checks for support
for -Werror (or the given argument) in the compiler. This mimics the
gcc configure option by allowing -Werror to be turned on safely; without
the option the tests written in configure itself fail compilation because
they cause compiler warnings.
Rewrote to run autoreconf instead of running tools one-by-one.
Conditionalize the install rules for MINGW and CYGWIN in CMakeLists.txt and
set CMAKE_LIBRARY_OUTPUT_DIRECTORY to "lib" on all platforms (C. Yapp).
Freeze libtool files in the 'scripts' directory. This version of
attempts to dissuade people from running it when it is not, or should not,
be necessary. In fact, does not work when run in a libpng
directory extracted from a tar distribution anymore. You must run it in
a GIT clone instead.
Added two images to contrib/pngsuite (1-bit and 2-bit transparent grayscale),
and renamed three whose names were inconsistent with those in
Version 1.6.0beta08 [February 1, 2012]
Fixed Image::colormap misalignment in pngstest.c
Check libtool/libtoolize version number (2.4.2) in
Divide into separate pngstest runs for basic and
transparent images.
Moved automake options to AM_INIT_AUTOMAKE in
Added color-tests, silent-rules (Not yet implemented in and
version checking to
Improved pngstest speed by not doing redundant tests and add const to
the background parameter of png_image_finish_read. The --background
option is now done automagically only when required, so that commandline
option no longer exists.
Cleaned up pngpriv.h to consistently declare all functions and data.
Also eliminated PNG_CONST_DATA, which is apparently not needed but we
can't be sure until it is gone.
Added symbol prefixing that allows all the libpng external symbols
to be prefixed (suggested by Reuben Hawkins).
Updated "ftbb*.png" list in the owatcom and vstudio projects.
Fixed 'prefix' builds on clean systems. The generation of pngprefix.h
should not require itself.
Updated INSTALL to explain that must be run in a GIT clone,
not in a libpng directory extracted from a tar distribution.
Version 1.6.0beta09 [February 1, 2012]
Reverted the prebuilt configure files to libpng-1.6.0beta05 condition.
Version 1.6.0beta10 [February 3, 2012]
Added Z_SOLO for zlib-1.2.6+ and correct pngstest tests
Updated list of test images in CMakeLists.txt
Updated the prebuilt configure files to current condition.
Revised INSTALL information about; it works in tar distributions.
Version 1.6.0beta11 [February 16, 2012]
Fix character count in pngstest command in projects/owatcom/pngstest.tgt
Revised to report PASS/FAIL for each image.
Updated documentation about the simplified API.
Corrected estimate of error in libpng png_set_rgb_to_gray API. The API is
extremely inaccurate for sRGB conversions because it uses an 8-bit
intermediate linear value and it does not use the sRGB transform, so it
suffers from the known instability in gamma transforms for values close
to 0 (see Poynton). The net result is that the calculation has a maximum
error of 14.99/255; 0.5/255^(1/2.2). pngstest now uses 15 for the
permitted 8-bit error. This may still not be enough because of arithmetic
Removed some unused arrays (with #ifdef) from png_read_push_finish_row().
Fixed a memory overwrite bug in simplified read of RGB PNG with
non-linear gamma Also bugs in the error checking in pngread.c and changed
quite a lot of the checks in pngstest.c to be correct; either correctly
written or not over-optimistic. The pngstest changes are insufficient to
allow all possible RGB transforms to be passed; pngstest cmppixel needs
to be rewritten to make it clearer which errors it allows and then changed
to permit known inaccuracies.
Removed tests for no-longer-used *_EMPTY_PLTE_SUPPORTED from pngstruct.h
Fixed fixed/float API export conditionals. 1) If FIXED_POINT or
FLOATING_POINT options were switched off, png.h ended up with lone ';'
characters. This is not valid ANSI-C outside a function. The ';'
characters have been moved inside the definition of PNG_FP_EXPORT and
PNG_FIXED_EXPORT. 2) If either option was switched off, the declaration
of the corresponding functions were completely omitted, even though some
of them are still used internally. The result is still valid, but
produces warnings from gcc with some warning options (including -Wall). The
fix is to cause png.h to declare the functions with PNG_INTERNAL_FUNCTION
when png.h is included from pngpriv.h.
Check for invalid palette index while reading paletted PNG. When one is
found, issue a warning and increase png_ptr->num_palette accordingly.
Apps are responsible for checking to see if that happened.
Version 1.6.0beta12 [February 18, 2012]
Do not increase num_palette on invalid_index.
Relocated check for invalid palette index to pngrtran.c, after unpacking
the sub-8-bit pixels.
Fixed CVE-2011-3026 buffer overrun bug. This bug was introduced when
iCCP chunk support was added at libpng-1.0.6. Deal more correctly with the
test on iCCP chunk length. Also removed spurious casts that may hide
problems on 16-bit systems.
Version 1.6.0beta13 [February 24, 2012]
Eliminated redundant png_push_read_tEXt|zTXt|iTXt|unknown code from
pngpread.c and use the sequential png_handle_tEXt, etc., in pngrutil.c;
now that png_ptr->buffer is inaccessible to applications, the special
handling is no longer useful.
Added PNG_SAFE_LIMITS feature to pnglibconf.dfa, pngpriv.h, and new
pngusr.dfa to reset the user limits to safe ones if PNG_SAFE_LIMITS is
defined. To enable, use "CPPFLAGS=-DPNG_SAFE_LIMITS_SUPPORTED=1" on the
configure command or put #define PNG_SAFE_LIMITS_SUPPORTED in
pnglibconf.h.prebuilt and pnglibconf.h.
Version 1.6.0beta14 [February 27, 2012]
Added information about the new limits in the manual.
Version 1.6.0beta15 [March 2, 2012]
Removed unused "current_text" members of png_struct and the png_free()
of png_ptr->current_text from pngread.c
Rewrote pngstest.c for substantial speed improvement.
Fixed transparent pixel and 16-bit rgb tests in pngstest and removed a
spurious check in pngwrite.c
Added PNG_IMAGE_FLAG_FAST for the benefit of applications that store
intermediate files, or intermediate in-memory data, while processing
image data with the simplified API. The option makes the files larger
but faster to write and read. pngstest now uses this by default; this
can be disabled with the --slow option.
Improved pngstest fine tuning of error numbers, new test file generator.
The generator generates images that test the full range of sample values,
allow the error numbers in pngstest to be tuned and checked. makepng
also allows generation of images with extra chunks, although this is
still work-in-progress.
Added check for invalid palette index while reading.
Fixed some bugs in ICC profile writing. The code should now accept
all potentially valid ICC profiles and reject obviously invalid ones.
It now uses png_error() to do so rather than casually writing a PNG
without the necessary color data.
Removed whitespace from the end of lines in all source files and scripts.
Version 1.6.0beta16 [March 6, 2012]
Relocated palette-index checking function from pngrutil.c to pngtrans.c