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[devel] Optionally use a loop instead of memset() to initialize memory.

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To try this, configure libpng using PNG_USE_MEMSET_LOOP.  Initial testing
with pngcrush was not promising, although it does save a hundred bytes or
so of executable size.
This commit is contained in:
Glenn Randers-Pehrson 2009-08-29 14:30:36 -05:00
parent 194ca9e7bb
commit 10ee432860
3 changed files with 32 additions and 5 deletions
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6
ANNOUNCE
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@ -1,5 +1,5 @@
Libpng 1.4.0beta78 - August 28, 2009
Libpng 1.4.0beta78 - August 29, 2009
This is not intended to be a public release. It will be replaced
within a few weeks by a public version or by another test version.
@ -534,7 +534,9 @@ version 1.4.0beta77 [August 27, 2009]
Moved CMakeLists.txt from scripts into the main libpng directory.
Various bugfixes and improvements to CMakeLists.txt (Philip Lowman)
version 1.4.0beta78 [August 28, 2009]
version 1.4.0beta78 [August 29, 2009]
Added abililty to configure libpng to use a loop instead of memset(),
using PNG_USE_MEMSET_LOOP.
version 1.4.0betaN [future]
Build shared libraries with -lz and sometimes -lm.

4
CHANGES
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@ -2220,7 +2220,9 @@ version 1.4.0beta77 [August 27, 2009]
Moved CMakeLists.txt from scripts into the main libpng directory.
Various bugfixes and improvements to CMakeLists.txt (Philip Lowman)
version 1.4.0beta78 [August 28, 2009]
version 1.4.0beta78 [August 29, 2009]
Added abililty to configure libpng to use a loop instead of memset(),
using PNG_USE_MEMSET_LOOP.
version 1.4.0betaN [future]
Build shared libraries with -lz and sometimes -lm.

25
pngconf.h
View File

@ -1,7 +1,7 @@
/* pngconf.h - machine configurable file for libpng
*
* libpng version 1.4.0beta78 - August 28, 2009
* libpng version 1.4.0beta78 - August 29, 2009
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1998-2009 Glenn Randers-Pehrson
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
@ -698,6 +698,13 @@
#define PNG_STRING_NEWLINE "\n"
#endif
/* Added at libpng-1.4.0 */
#if !defined(PNG_NO_USE_SYSTEM_MEMSET) || defined(PNG_USE_MEMSET_LOOP)
# ifndef PNG_USE_SYSTEM_MEMSET
# define PNG_USE_SYSTEM_MEMSET
# endif
#endif
/* These are currently experimental features, define them if you want */
/* very little testing */
@ -1323,6 +1330,16 @@ typedef char FAR * FAR * FAR * png_charppp;
# endif
#endif
/* Added at libpng-1.4.0 */
#ifndef PNG_USE_SYSTEM_MEMSET
# define png_memset(array,value,num) \
{ \
int ipng_memset; \
for (ipng_memset=0; ipng_memset<(num); ++ipng_memset) \
((png_bytep)array)[ipng_memset] = (value); \
}
#endif
#if defined(USE_FAR_KEYWORD)
/* use this to make far-to-near assignments */
# define CHECK 1
@ -1334,7 +1351,9 @@ typedef char FAR * FAR * FAR * png_charppp;
# define png_strlen _fstrlen
# define png_memcmp _fmemcmp /* SJT: added */
# define png_memcpy _fmemcpy
# ifndef png_memset
# define png_memset _fmemset
# endif
# define png_sprintf sprintf
#else
# if defined(_WINDOWS_) /* favor Windows over C runtime fns */
@ -1345,7 +1364,9 @@ typedef char FAR * FAR * FAR * png_charppp;
# define png_strlen lstrlenA
# define png_memcmp memcmp
# define png_memcpy CopyMemory
# ifndef png_memset
# define png_memset memset
# endif
# define png_sprintf wsprintfA
# else
# define CVT_PTR(ptr) (ptr)
@ -1355,7 +1376,9 @@ typedef char FAR * FAR * FAR * png_charppp;
# define png_strlen strlen
# define png_memcmp memcmp /* SJT: added */
# define png_memcpy memcpy
# ifndef png_memset
# define png_memset memset
# endif
# define png_sprintf sprintf
# ifndef PNG_NO_SNPRINTF
# ifdef _MSC_VER