313 lines
16 KiB
Plaintext
313 lines
16 KiB
Plaintext
CHANGES - 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 0.97 [January, 1998]
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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. (Andreas Dilger)
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added RFC 1152 [sic] date support
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fixed bug in gamma handling of 4-bit grayscale
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added 2-bit grayscale gamma handling (Glenn R-P)
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added more typecasts. 65536L becomes (png_uint_32)65536L, etc. (Glenn R-P)
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minor corrections in libpng.txt
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added simple sRGB support (Glenn R-P)
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easier conditional compiling, e.g. define PNG_READ/WRITE_NOT_FULLY_SUPPORTED;
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all configurable options can be selected from command-line instead
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of having to edit pngconf.h (Glenn R-P)
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fixed memory leak in pngwrite.c (free info_ptr->text) (Glenn R-P)
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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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repaired PNG_NO_STDIO behaviour
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tested NODIV support and made it default behaviour (Greg Roelofs)
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added "-m" option and PNGTEST_DEBUG_MEMORY to pngtest (John Bowler)
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regularized version numbering scheme and bumped shared-library major
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version number to 2 to avoid problems with libpng 0.89 apps (Greg Roelofs)
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version 0.98 [January, 1998]
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cleaned up some typos in libpng.txt and in code documentation
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fixed memory leaks in pCAL chunk processing (Glenn R-P and John Bowler)
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cosmetic change "display_gamma" to "screen_gamma" in pngrtran.c
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changed recommendation about file_gamma for PC images to .51 from .45,
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in example.c and libpng.txt, added comments to distinguish between
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screen_gamma, viewing_gamma, and display_gamma.
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changed all references to RFC1152 to read RFC1123 and changed the
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PNG_TIME_RFC1152_SUPPORTED macro to PNG_TIME_RFC1123_SUPPORTED
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added png_invert_alpha capability (Glenn R-P -- suggestion by Jon Vincent)
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changed srgb_intent from png_byte to int to avoid compiler bugs
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version 0.99 [January 30, 1998]
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free info_ptr->text instead of end_info_ptr->text in pngread.c (John Bowler)
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fixed a longstanding "packswap" bug in pngtrans.c
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fixed some inconsistencies in pngconf.h that prevented compiling with
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PNG_READ_GAMMA_SUPPORTED and PNG_READ_hIST_SUPPORTED undefined
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fixed some typos and made other minor rearrangement of libpng.txt (Andreas)
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changed recommendation about file_gamma for PC images to .50 from .51 in
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example.c and libpng.txt, and changed file_gamma for sRGB images to .45
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added a number of functions to access information from the png structure
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png_get_image_height(), etc. (Glenn R-P, suggestion by Brad Pettit)
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added TARGET_MACOS similar to zlib-1.0.8
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define PNG_ALWAYS_EXTERN when __MWERKS__ && WIN32 are defined
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added type casting to all png_malloc() function calls
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version 0.99a [January 31, 1998]
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Added type casts and parentheses to all returns that return a value.(Tim W.)
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version 0.99b [February 4, 1998]
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Added type cast png_uint_32 on malloc function calls where needed.
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Changed type of num_hist from png_uint_32 to int (same as num_palette).
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Added checks for rowbytes overflow, in case png_size_t is less than 32 bits.
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Renamed makefile.elf to makefile.lnx.
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version 0.99c [February 7, 1998]
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More type casting. Removed erroneous overflow test in pngmem.c.
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Added png_buffered_memcpy() and png_buffered_memset(), apply them to rowbytes.
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Added UNIX manual pages libpng.3 (incorporating libpng.txt) and png.5.
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version 0.99d [February 11, 1998]
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Renamed "far_to_near()" "png_far_to_near()"
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Revised libpng.3
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Version 99c "buffered" operations didn't work as intended. Replaced them
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with png_memcpy_check() and png_memset_check().
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Added many "if (png_ptr == NULL) return" to quell compiler warnings about
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unused png_ptr, mostly in pngget.c and pngset.c.
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Check for overlength tRNS chunk present when indexed-color PLTE is read.
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Cleaned up spelling errors in libpng.3/libpng.txt
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Corrected a problem with png_get_tRNS() which returned undefined trans array
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version 0.99e [February 28, 1998]
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Corrected png_get_tRNS() again.
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Add parentheses for easier reading of pngget.c, fixed "||" should be "&&".
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Touched up example.c to make more of it compileable, although the entire
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file still can't be compiled (Willem van Schaik)
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Fixed a bug in png_do_shift() (Bryan Tsai)
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Added a space in png.h prototype for png_write_chunk_start()
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Replaced pngtest.png with one created with zlib 1.1.1
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Changed pngtest to report PASS even when file size is different (Jean-loup G.)
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Corrected some logic errors in png_do_invert_alpha() (Chris Patterson)
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version 0.99f [March 5, 1998]
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Corrected a bug in pngpread() introduced in version 99c (Kevin Bracey)
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Moved makefiles into a "scripts" directory, and added INSTALL instruction file
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Added makefile.os2 and pngos2.def (A. Zabolotny) and makefile.s2x (W. Sebok)
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Added pointers to "note on libpng versions" in makefile.lnx and README
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Added row callback feature when reading and writing nonprogressive rows
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and added a test of this feature in pngtest.c
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Added user transform callbacks, with test of the feature in pngtest.c
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version 0.99g [March 6, 1998, morning]
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Minor changes to pngtest.c to suppress compiler warnings.
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Removed "beta" language from documentation.
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version 0.99h [March 6, 1998, evening]
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Minor changes to previous minor changes to pngtest.c
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Changed PNG_READ_NOT_FULLY_SUPPORTED to PNG_READ_TRANSFORMS_NOT_SUPPORTED
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and added PNG_PROGRESSIVE_READ_NOT_SUPPORTED macro
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version 1.00 [March 7, 1998]
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Changed several typedefs in pngrutil.c
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Added makefile.wat (Pawel Mrochen), updated makefile.tc3 (Willem van Schaik)
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replaced "while(1)" with "for(;;)"
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added PNGARG() to prototypes in pngtest.c and removed some prototypes
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updated some of the makefiles (Tom Lane)
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changed some typedefs (s_start, etc.) in pngrutil.c
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fixed dimensions of "short_months" array in pngwrite.c
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Replaced ansi2knr.c with the one from jpeg-v6
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version 1.0.0 [March 8, 1998]
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Changed name from 1.00 to 1.0.0 (Adam Costello)
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Added smakefile.ppc (with SCOPTIONS.ppc) for Amiga PPC (Andreas Kleinert)
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version 1.0.0a [March 9, 1998]
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Fixed three bugs in pngrtran.c to make gamma+background handling consistent
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(Greg Roelofs)
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Changed format of the PNG_LIBPNG_VER integer to xyyzz instead of xyz
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for major, minor, and bugfix releases. This is 10001. (Adam Costello,
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Tom Lane)
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Make months range from 1-12 in png_convert_to_rfc1123
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version 1.0.0b [March 13, 1998]
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Quieted compiler complaints about two empty "for" loops in pngrutil.c
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Minor changes to makefile.s2x
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Removed #ifdef/#endif around a png_free() in pngread.c
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version 1.0.1 [March 14, 1998]
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Changed makefile.s2x to reduce security risk of using a relative pathname
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Fixed some typos in the documentation (Greg).
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Fixed a problem with value of "channels" returned by png_read_update_info()
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version 1.0.1a [April 21, 1998]
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Optimized Paeth calculations by replacing abs() function calls with intrinsics
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plus other loop optimizations. Improves avg decoding speed by about 20%.
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Commented out i386istic "align" compiler flags in makefile.lnx.
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Reduced the default warning level in some makefiles, to make them consistent.
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Removed references to IJG and JPEG in the ansi2knr.c copyright statement.
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Fixed a bug in png_do_strip_filler with XXRRGGBB => RRGGBB transformation.
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Added grayscale and 16-bit capability to png_do_read_filler().
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Fixed a bug in pngset.c, introduced in version 0.99c, that sets rowbytes
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too large when writing an image with bit_depth < 8 (Bob Dellaca).
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Corrected some bugs in the experimental weighted filtering heuristics.
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Moved a misplaced pngrutil code block that truncates tRNS if it has more
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than num_palette entries -- test was done before num_palette was defined.
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Fixed a png_convert_to_rfc1123() bug that converts day 31 to 0 (Steve Eddins).
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Changed compiler flags in makefile.wat for better optimization (Pawel Mrochen).
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version 1.0.1b [May 2, 1998]
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Relocated png_do_gray_to_rgb() within png_do_read_transformations() (Greg).
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Relocated the png_composite macros from pngrtran.c to png.h (Greg).
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Added makefile.sco (contributed by Mike Hopkirk).
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Fixed two bugs (missing definitions of "istop") introduced in libpng-1.0.1a.
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Fixed a bug in pngrtran.c that would set channels=5 under some circumstances.
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More work on the Paeth-filtering, achieving imperceptible speedup (A Kleinert).
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More work on loop optimization which may help when compiled with C++ compilers.
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Added warnings when people try to use transforms they've defined out.
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