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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 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. 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. Moved CMakeLists.txt from scripts into the main libpng directory.
Various bugfixes and improvements to CMakeLists.txt (Philip Lowman) 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] version 1.4.0betaN [future]
Build shared libraries with -lz and sometimes -lm. 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. Moved CMakeLists.txt from scripts into the main libpng directory.
Various bugfixes and improvements to CMakeLists.txt (Philip Lowman) 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] version 1.4.0betaN [future]
Build shared libraries with -lz and sometimes -lm. Build shared libraries with -lz and sometimes -lm.

27
pngconf.h
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@ -1,7 +1,7 @@
/* pngconf.h - machine configurable file for libpng /* 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 * For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1998-2009 Glenn Randers-Pehrson * Copyright (c) 1998-2009 Glenn Randers-Pehrson
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
@ -698,6 +698,13 @@
#define PNG_STRING_NEWLINE "\n" #define PNG_STRING_NEWLINE "\n"
#endif #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 */ /* These are currently experimental features, define them if you want */
/* very little testing */ /* very little testing */
@ -1323,6 +1330,16 @@ typedef char FAR * FAR * FAR * png_charppp;
# endif # endif
#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) #if defined(USE_FAR_KEYWORD)
/* use this to make far-to-near assignments */ /* use this to make far-to-near assignments */
# define CHECK 1 # define CHECK 1
@ -1334,7 +1351,9 @@ typedef char FAR * FAR * FAR * png_charppp;
# define png_strlen _fstrlen # define png_strlen _fstrlen
# define png_memcmp _fmemcmp /* SJT: added */ # define png_memcmp _fmemcmp /* SJT: added */
# define png_memcpy _fmemcpy # define png_memcpy _fmemcpy
# define png_memset _fmemset # ifndef png_memset
# define png_memset _fmemset
# endif
# define png_sprintf sprintf # define png_sprintf sprintf
#else #else
# if defined(_WINDOWS_) /* favor Windows over C runtime fns */ # 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_strlen lstrlenA
# define png_memcmp memcmp # define png_memcmp memcmp
# define png_memcpy CopyMemory # define png_memcpy CopyMemory
# ifndef png_memset
# define png_memset memset # define png_memset memset
# endif
# define png_sprintf wsprintfA # define png_sprintf wsprintfA
# else # else
# define CVT_PTR(ptr) (ptr) # define CVT_PTR(ptr) (ptr)
@ -1355,7 +1376,9 @@ typedef char FAR * FAR * FAR * png_charppp;
# define png_strlen strlen # define png_strlen strlen
# define png_memcmp memcmp /* SJT: added */ # define png_memcmp memcmp /* SJT: added */
# define png_memcpy memcpy # define png_memcpy memcpy
# ifndef png_memset
# define png_memset memset # define png_memset memset
# endif
# define png_sprintf sprintf # define png_sprintf sprintf
# ifndef PNG_NO_SNPRINTF # ifndef PNG_NO_SNPRINTF
# ifdef _MSC_VER # ifdef _MSC_VER