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Imported from libpng-1.2.3.tar

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Glenn Randers-Pehrson
2002-05-21 18:06:08 -05:00
parent 22f28966c4
commit cfbed9bdf2
63 changed files with 973 additions and 1066 deletions
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17
libpng.txt
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@@ -1,6 +1,6 @@
libpng.txt - A description on how to use and modify libpng
libpng version 1.2.3rc6 - May 13, 2002
libpng version 1.2.3 - May 21, 2002
Updated and distributed by Glenn Randers-Pehrson
<randeg@alum.rpi.edu>
Copyright (c) 1998-2002 Glenn Randers-Pehrson
@@ -2301,18 +2301,17 @@ goes through callbacks that are user-settable. The default routines are
in pngmem.c, pngrio.c, pngwio.c, and pngerror.c, respectively. To change
these functions, call the appropriate png_set_*_fn() function.
Memory allocation is done through the functions png_malloc(), png_zalloc(),
Memory allocation is done through the functions png_malloc()
and png_free(). These currently just call the standard C functions. If
your pointers can't access more then 64K at a time, you will want to set
MAXSEG_64K in zlib.h. Since it is unlikely that the method of handling
memory allocation on a platform will change between applications, these
functions must be modified in the library at compile time. If you prefer
to use a different method of allocating and freeing data, you can use
png_create_read_struct_2() or png_create_write_struct_2() to register
your own functions as described above.
png_set_mem_fn(png_structp png_ptr, png_voidp mem_ptr,
png_malloc_ptr malloc_fn, png_free_ptr free_fn)
This function also provides a void pointer that can be retrieved via
These functions also provide a void pointer that can be retrieved via
mem_ptr=png_get_mem_ptr(png_ptr);
@@ -2322,7 +2321,7 @@ Your replacement memory functions must have prototypes as follows:
png_size_t size);
void free_fn(png_structp png_ptr, png_voidp ptr);
Your malloc_fn() can return NULL in case of failure. The png_malloc()
Your malloc_fn() should return NULL in case of failure. The png_malloc()
function will call png_error() if it receives a NULL from the system
memory allocator or from your replacement malloc_fn().
@@ -2851,13 +2850,13 @@ application:
IX. Y2K Compliance in libpng
May 13, 2002
May 21, 2002
Since the PNG Development group is an ad-hoc body, we can't make
an official declaration.
This is your unofficial assurance that libpng from version 0.71 and
upward through 1.2.3rc6 are Y2K compliant. It is my belief that earlier
upward through 1.2.3 are Y2K compliant. It is my belief that earlier
versions were also Y2K compliant.
Libpng only has three year fields. One is a 2-byte unsigned integer that