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278 lines
14 KiB
278 lines
14 KiB
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 1.0.1 [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 xyyyzzzz instead of xyz |
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for major, minor, and bugfix releases. This is 10000001L. (Adam Costello)
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