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一个国人自己实现图像库的程序（有参考价值）

Libpng 1.2.1 - December 12, 2001

This is a public release of libpng, intended for use in production codes.

Changes since the last public release (1.2.0):

  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().
  Added makefile.so9.
  Removed type casts from all NULLs, except for those appearing in function
    calls when PNG_NO_TYPECAST_NULL is defined.
  Simplified png_create_info_struct() and png_creat_struct_2().
  Added error message if png_write_info() was omitted.
  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.
  Added a pop/push operation to pngvcrd.c, to preserve Eflag.
  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.

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Glenn R-P