188 lines
9.0 KiB
Plaintext
188 lines
9.0 KiB
Plaintext
pngchange.txt - changes for libpng
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version 0.2
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added reader into png.h
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fixed small problems in stub file
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version 0.3
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added pull reader
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split up pngwrite.c to several files
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added pnglib.txt
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added example.c
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cleaned up writer, adding a few new tranformations
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fixed some bugs in writer
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interfaced with zlib 0.5
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added K&R support
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added check for 64 KB blocks for 16 bit machines
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version 0.4
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cleaned up code and commented code
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simplified time handling into png_time
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created png_color_16 and png_color_8 to handle color needs
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cleaned up color type defines
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fixed various bugs
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made various names more consistant
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interfaced with zlib 0.71
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cleaned up zTXt reader and writer (using zlib's Reset functions)
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split transformations into pngrtran.c and pngwtran.c
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version 0.5
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interfaced with zlib 0.8
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fixed many reading and writing bugs
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saved using 3 spaces instead of tabs
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version 0.6
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added png_large_malloc() and png_large_free()
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added png_size_t
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cleaned up some compiler warnings
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added png_start_read_image()
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version 0.7
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cleaned up lots of bugs
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finished dithering and other stuff
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added test program
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changed name from pnglib to libpng
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version 0.71 [June, 1995]
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changed pngtest.png for zlib 0.93
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fixed error in libpng.txt and example.c
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version 0.8
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cleaned up some bugs
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added png_set_filler()
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split up pngstub.c into pngmem.c, pngio.c, and pngerror.c
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added #define's to remove unwanted code
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moved png_info_init() to png.c
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added old_size into png_realloc()
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added functions to manually set filtering and compression info
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changed compression parameters based on image type
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optimized filter selection code
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added version info
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changed external functions passing floats to doubles (k&r problems?)
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put all the configurable stuff in pngconf.h
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enabled png_set_shift to work with paletted images on read
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added png_read_update_info() - updates info structure with
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transformations
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version 0.81 [August, 1995]
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incorporated Tim Wegner's medium model code (thanks, Tim)
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version 0.82 [September, 1995]
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[unspecified changes]
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version 0.85 [December, 1995]
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added more medium model code (almost everything's a far)
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added i/o, error, and memory callback functions
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fixed some bugs (16 bit, 4 bit interlaced, etc.)
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added first run progressive reader (barely tested)
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version 0.86 [January, 1996]
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fixed bugs
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improved documentation
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version 0.87 [January, 1996]
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fixed medium model bugs
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fixed other bugs introduced in 0.85 and 0.86
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added some minor documentation
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version 0.88 [January, 1996]
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fixed progressive bugs
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replaced tabs with spaces
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cleaned up documentation
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added callbacks for read/write and warning/error functions
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version 0.89 [July, 1996]
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added new initialization API to make libpng work better with shared libs
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we now have png_create_read_struct(), png_create_write_struct(),
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png_create_info_struct(), png_destroy_read_struct(), and
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png_destroy_write_struct() instead of the separate calls to
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malloc and png_read_init(), png_info_init(), and png_write_init()
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changed warning/error callback functions to fix bug - this means you
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should use the new initialization API if you were using the old
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png_set_message_fn() calls, and that the old API no longer exists
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so that people are aware that they need to change their code
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changed filter selection API to allow selection of multiple filters
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since it didn't work in previous versions of libpng anyways
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optimized filter selection code
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fixed png_set_background() to allow using an arbitrary RGB color for
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paletted images
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fixed gamma and background correction for paletted images, so
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png_correct_palette is not needed unless you are correcting an
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external palette (you will need to #define PNG_CORRECT_PALETTE_SUPPORTED
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in pngconf.h) - if nobody uses this, it may disappear in the future.
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fixed bug with Borland 64K memory allocation (Alexander Lehmann)
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fixed bug in interlace handling (Smarasderagd, I think)
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added more error checking for writing and image to reduce invalid files
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separated read and write functions so that they won't both be linked
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into a binary when only reading or writing functionality is used
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new pngtest image also has interlacing and zTXt
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updated documentation to reflect new API
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version 0.90 [January, 1997]
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made CRC errors/warnings on critical and ancillary chunks configurable
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libpng will use the zlib CRC routines by (compile-time) default
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changed DOS small/medium model memory support - needs zlib 1.04 (Tim Wegner)
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added external C++ wrapper statements to png.h (Gilles Dauphin)
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allow PNG file to be read when some or all of file signature has already
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been read from the beginning of the stream. ****This affects the size
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of info_struct and invalidates all programs that use a shared libpng****
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fixed png_filler() declarations
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fixed? background color conversions
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fixed order of error function pointers to match documentation
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current chunk name is now available in png_struct to reduce the number
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of nearly identical error messages (will simplify multi-lingual
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support when available)
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try to get ready for unknown-chunk callback functions:
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- previously read critical chunks are flagged, so the chunk handling
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routines can determine if the chunk is in the right place
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- all chunk handling routines have the same prototypes, so we will
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be able to handle all chunks via a callback mechanism
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try to fix Linux "setjmp" buffer size problems
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version 0.95 [March, 1997]
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fixed bug in pngwutil.c allocating "up_row" twice and "avg_row" never
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fixed bug in PNG file signature compares when start != 0
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changed parameter type of png_set_filler(...filler...) from png_byte
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to png_uint_32
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added test for MACOS to ensure that both math.h and fp.h are not #included
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added macros for libpng to be compiled as a Windows DLL (Andreas Kupries)
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added "packswap" transformation, which changes the endianness of
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packed-pixel bytes (Kevin Bracey)
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added "strip_alpha" transformation, which removes the alpha channel of
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input images without using it (not neccesarily a good idea)
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added "swap_alpha" transformation, which puts the alpha channel in front
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of the color bytes instead of after
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removed all implicit variable tests which assume NULL == 0 (I think)
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changed several variables to "png_size_t" to show 16/32-bit limitations
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added new pCAL chunk read/write support
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added experimental filter selection weighting (Greg Roelofs)
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removed old png_set_rgbx() and png_set_xrgb() functions that have been
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obsolete for about 2 years now (use png_set_filler() instead)
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added macros to read 16- and 32-bit ints directly from buffer, to be
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used only on those systems that support it (namely PowerPC and 680x0)
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With some testing, this may become the default for MACOS/PPC systems.
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only calculate CRC on data if we are going to use it
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added macros for zTXt compression type PNG_zTXt_COMPRESSION_???
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added macros for simple libpng debugging output selectable at compile time
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removed PNG_READ_END_MODE in progressive reader (Smarasderagd)
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more description of info_struct in libpng.txt and png.h
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more instructions in example.c
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more chunk types tested in pngtest.c
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renamed pngrcb.c to pngset.c, and all png_read_<chunk> functions to be
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png_set_<chunk>. We now have corresponding png_get_<chunk>
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functions in pngget.c to get infomation in info_ptr. This isolates
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the application from the internal organization of png_info_struct
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(good for shared library implementations).
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version 0.96 [May, 1997]
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fixed serious bug with < 8bpp images introduced in 0.95
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fixed 256-color transparency bug (Greg Roelofs)
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fixed up documentation (Greg Roelofs, Laszlo Nyul)
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fixed "error" in pngconf.h for Linux setjmp() behaviour
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fixed DOS medium model support (Tim Wegner)
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fixed png_check_keyword() for case with error in static string text
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added read of CRC after IEND chunk for embedded PNGs (Laszlo Nyul)
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added typecasts to quiet compiler errors
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added more debugging info
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version 1.00 [not distributed, but Andreas handed off to G&G]
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skipped version 1.00 to avoid potential problems with shared libraries
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created with version 0.89
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removed PNG_USE_OWN_CRC capability
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relocated png_set_crc_action from pngrutil.c to pngrtran.c
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fixed typecasts of "new_key" etc.
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added RFC 1152 date support
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version 1.00.97 [Dec 1997]
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fixed bug in gamma handling of 4-bit grayscale
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added more typecasts. 65536L becomes (png_uint_32)65536L, etc.
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minor corrections in libpng.txt
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added simple sRGB support
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make it simpler to do conditional compiling
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fixed memory leak in pngwrite.c (free info_ptr->text)
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added more conditions for png_do_background, to avoid changing
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black pixels to background when a background is supplied and
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no pixels are transparent
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include stdio.h in pngconf.h even when PNG_NO_STDIO is defined.
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