96 lines
3.2 KiB
Plaintext
96 lines
3.2 KiB
Plaintext
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Known bugs and suggested enhancements in libpng-1.0.7
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1. July 2, 2000 -- BUG -- pnggccrd.c
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Some programs compiled with PNG_USE_PNGGCCRD crash in pnggccrd.c.
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Also, pnggccrd.c will not compile under gcc-2.95-2.
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STATUS: Under investigation. Experts on MMX assembler code are
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invited to help with the debugging. Note that pngvcrd.c works fine.
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Update: fixed in libpng-1.0.8beta1. It compiles under gcc-2.7.2.3
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and seems to work; under gcc-2.7.2.1 it compiles but crashes in
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execution. It is recommended that people use 2.95.2 or later.
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The png_read_filter() function has still not been fully converted and
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will not compile under gcc-2.95.2; it is currently ifdef'ed out.
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2. July 3, 2000 -- BUG -- MEMORY LEAK
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There is a memory leak in pngpread.c; it doesn't free "key".
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STATUS: Fixed in libpng-1.0.8beta1, by adding.
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png_free(png_ptr, text_ptr);
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after lines 1221 and 1038 in pngpread.c
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3. July 3, 2000 -- BUG -- PNG_EXPORT_VAR
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The definition of PNG_EXPORT_VAR, in pngconf.h, should be
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# define PNG_EXPORT_VAR(type) extern PNG_IMPEXP type
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STATUS: Fixed in libpng-1.0.8beta1.
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4. July 3, 2000 -- BUG -- PNG_NO_STDIO
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Several places in pngrutil.c and pngwutil.c, there are printf statements
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inside PNG_NO_STDIO blocks (should be PNG_NO_CONSOLE_IO)
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STATUS: Fixed in libpng-1.0.8beta1.
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5. July 3, 2000 -- ENHANCEMENT -- WindowsCE support
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Libpng-1.0.7 does not support WindowsCE.
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STATUS: Libpng-1.0.8 and libpng-2.0.0 will support WindowsCE. A
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new typedef, png_FILE_p, will be added which is normally FILE * but
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will be HANDLE if libpng is being built for WindowsCE. Other patches
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required for WindowsCE support have been provided and will be applied.
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Finished in libpng-1.0.8beta3.
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6. July 13, 2000 -- ENHANCEMENT -- Cygwin support
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Libpng-1.0.7 does not support building DLLs under Cygwin
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STATUS: Cygwin support has been added to libpng-1.0.8beta4.
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7. March 15, 1998 -- OPTIMIZATION -- Kevin Bracey
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Loops need to be optimized everywhere
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Make them count down instead of up -- Kevin Bracey
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Optimizing compilers don't need this, and making
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the change would be error prone -- Tom Lane, Glenn R-P
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Question whether i-- or --i is better.
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STATUS: Under investigation, postponed until after
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libpng-1.1.0. About 160 loops will be turned around
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in libpng-2.0.x betaxx, for testing.
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8. July 4, 1998 -- ENHANCEMENT -- Glenn R-P
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libpng-1.0.5 and earlier transform colors to gamma=1.0 space for
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merging with background, and then back to the image's gamma. The
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bit_depth of the intermediate (gamma=1.0) representation is probably
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not sufficient. In the typical gamma=1/2.2 situation, the linear
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pixels need about 4 more bits than the gamma-encoded ones, to avoid
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loss of precision. A similar situation exists with the rgb_to_gray
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operation.
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STATUS: under development.
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9. September 1999 -- ENHANCEMENT --
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It should be possible to use libpng without floating-point aritmetic.
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STATUS: Under investigation, implementation postponed until after
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libpng-1.0.7.
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Much of this was completed in libpng-1.0.6, but gamma compensation
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is not yet done in fixed-point arithmetic.
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