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Imported from libpng-1.2.20rc4.tar

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This commit is contained in:
Glenn Randers-Pehrson 2007-09-01 15:12:50 -05:00
parent 9cc7b03503
commit d20666a228
60 changed files with 204 additions and 11915 deletions
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31
ANNOUNCE
View File

@ -1,5 +1,5 @@
Libpng 1.2.20rc3 - August 30, 2007
Libpng 1.2.20rc4 - September 1, 2007
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.
@ -9,32 +9,32 @@ Files available for download:
Source files with LF line endings (for Unix/Linux) and with a
"configure" script
libpng-1.2.20rc3.tar.gz
libpng-1.2.20rc3.tar.bz2
libpng-1.2.20rc4.tar.gz
libpng-1.2.20rc4.tar.bz2
Source files with LF line endings (for Unix/Linux) without the
"configure" script
libpng-1.2.20rc3-no-config.tar.gz
libpng-1.2.20rc3-no-config.tar.bz2
libpng-1.2.20rc4-no-config.tar.gz
libpng-1.2.20rc4-no-config.tar.bz2
Source files with CRLF line endings (for Windows), without the
"configure" script
lp1220r03.zip
lp1220r03.tar.bz2
lp1220r04.zip
lp1220r04.tar.bz2
Project files
libpng-1.2.20rc3-project-netware.zip
libpng-1.2.20rc3-project-wince.zip
libpng-1.2.20rc4-project-netware.zip
libpng-1.2.20rc4-project-wince.zip
Other information:
libpng-1.2.20rc3-README.txt
libpng-1.2.20rc3-KNOWNBUGS.txt
libpng-1.2.20rc3-LICENSE.txt
libpng-1.2.20rc3-Y2K-compliance.txt
libpng-1.2.20rc4-README.txt
libpng-1.2.20rc4-KNOWNBUGS.txt
libpng-1.2.20rc4-LICENSE.txt
libpng-1.2.20rc4-Y2K-compliance.txt
Changes since the last public release (1.2.19):
@ -62,13 +62,16 @@ version 1.2.20rc2 [August 27, 2007]
Revised #ifdefs to ensure one and only one of pnggccrd.c, pngvcrd.c,
or part of pngrutil.c is selected.
version 1.2.20rc3 [August 30, 2007]
version 1.2.20rc3 [September 1, 2007]
Remove a little more code in pngwutil.c when PNG_NO_WRITE_FILTER is selected.
Added /D _CRT_SECURE_NO_WARNINGS to visual6c and visualc71 projects.
Compile png_mmx_support() in png.c even when PNG_NO_MMX_CODE is defined.
Restored a "superfluous" #ifdef that was removed from 1.2.20rc2 pnggccrd.c,
breaking the png_mmx_support() function.
version 1.2.20rc4 [September 1, 2007]
Removed Intel contributions (MMX, Optimized C).
Send comments/corrections/commendations to png-mng-implement at lists.sf.net
(subscription required; visit

3
CHANGES
View File

@ -1926,6 +1926,9 @@ version 1.2.20rc3 [August 30, 2007]
Restored a "superfluous" #ifdef that was removed from 1.2.20rc2 pnggccrd.c,
breaking the png_mmx_support() function.
version 1.2.20rc4 [September 1, 2007]
Removed Intel contributions (MMX, Optimized C).
Send comments/corrections/commendations to png-mng-implement at lists.sf.net
(subscription required; visit
https://lists.sourceforge.net/lists/listinfo/png-mng-implement

27
INSTALL
View File

@ -1,5 +1,5 @@
Installing libpng version 1.2.20rc3 - August 30, 2007
Installing libpng version 1.2.20rc4 - September 1, 2007
On Unix/Linux and similar systems, you can simply type
@ -44,7 +44,7 @@ to have access to the zlib.h and zconf.h include files that
correspond to the version of zlib that's installed.
You can rename the directories that you downloaded (they
might be called "libpng-1.2.20rc3" or "lpng109" and "zlib-1.2.1"
might be called "libpng-1.2.20rc4" or "lpng109" and "zlib-1.2.1"
or "zlib121") so that you have directories called "zlib" and "libpng".
Your directory structure should look like this:
@ -101,15 +101,9 @@ include
CMakeLists.txt => "cmake" script
makefile.std => Generic UNIX makefile (cc, creates static libpng.a)
makefile.elf => Linux/ELF makefile symbol versioning,
gcc, creates libpng12.so.0.1.2.20rc3)
gcc, creates libpng12.so.0.1.2.20rc4)
makefile.linux => Linux/ELF makefile
(gcc, creates libpng12.so.0.1.2.20rc3)
makefile.gcmmx => Linux/ELF makefile
(gcc, creates libpng12.so.0.1.2.20rc3,
uses assembler code tuned for Intel MMX platform)
makefile.nommx => Linux/ELF makefile
(gcc, creates libpng12.so.0.1.2.20rc3
does not use Intel MMX assembler code)
(gcc, creates libpng12.so.0.1.2.20rc4)
makefile.gcc => Generic makefile (gcc, creates static libpng.a)
makefile.knr => Archaic UNIX Makefile that converts files with
ansi2knr (Requires ansi2knr.c from
@ -131,14 +125,14 @@ include
makefile.openbsd => OpenBSD makefile
makefile.sgi => Silicon Graphics IRIX makefile (cc, creates static lib)
makefile.sggcc => Silicon Graphics (gcc,
creates libpng12.so.0.1.2.20rc3)
creates libpng12.so.0.1.2.20rc4)
makefile.sunos => Sun makefile
makefile.solaris => Solaris 2.X makefile (gcc,
creates libpng12.so.0.1.2.20rc3)
creates libpng12.so.0.1.2.20rc4)
makefile.solaris-x86 => Solaris/intelMMX 2.X makefile (gcc,
creates libpng12.so.0.1.2.20rc3)
creates libpng12.so.0.1.2.20rc4)
makefile.so9 => Solaris 9 makefile (gcc,
creates libpng12.so.0.1.2.20rc3)
creates libpng12.so.0.1.2.20rc4)
makefile.32sunu => Sun Ultra 32-bit makefile
makefile.64sunu => Sun Ultra 64-bit makefile
makefile.sco => For SCO OSr5 ELF and Unixware 7 with Native cc
@ -154,10 +148,7 @@ include
makefile.tc3 => Turbo C 3.0 makefile
makefile.dj2 => DJGPP 2 makefile
makefile.msc => Microsoft C makefile
makefile.vcawin32 => makefile for Microsoft Visual C++ 5.0 and later (uses
assembler code tuned for Intel MMX platform)
makefile.vcwin32 => makefile for Microsoft Visual C++ 4.0 and later (does
not use assembler code)
makefile.vcwin32 => makefile for Microsoft Visual C++ 4.0 and later
makefile.os2 => OS/2 Makefile (gcc and emx, requires pngos2.def)
pngos2.def => OS/2 module definition file used by makefile.os2
makefile.watcom => Watcom 10a+ Makefile, 32-bit flat memory model

2
KNOWNBUG
View File

@ -1,5 +1,5 @@
Known bugs in libpng version 1.2.20rc3
Known bugs in libpng version 1.2.20rc4
1. April 22, 2001: pnggccrd.c has been reported to crash on NetBSD when
reading interlaced PNG files, when assembler code is enabled but running

4
LICENSE
View File

@ -8,7 +8,7 @@ COPYRIGHT NOTICE, DISCLAIMER, and LICENSE:
If you modify libpng you may insert additional notices immediately following
this sentence.
libpng versions 1.2.6, August 15, 2004, through 1.2.20rc3, August 30, 2007, are
libpng versions 1.2.6, August 15, 2004, through 1.2.20rc4, September 1, 2007, are
Copyright (c) 2004, 2006-2007 Glenn Randers-Pehrson, and are
distributed according to the same disclaimer and license as libpng-1.2.5
with the following individual added to the list of Contributing Authors
@ -106,4 +106,4 @@ certification mark of the Open Source Initiative.
Glenn Randers-Pehrson
glennrp at users.sourceforge.net
August 30, 2007
September 1, 2007

4
Makefile.am
View File

@ -33,7 +33,7 @@ lib_LTLIBRARIES=libpng12.la @compatlib@
EXTRA_LTLIBRARIES= libpng.la
libpng12_la_SOURCES = png.c pngset.c pngget.c pngrutil.c pngtrans.c pngwutil.c \
pngread.c pngrio.c pngwio.c pngwrite.c pngrtran.c \
pngwtran.c pngmem.c pngerror.c pngpread.c pnggccrd.c \
pngwtran.c pngmem.c pngerror.c pngpread.c \
png.h pngconf.h
libpng_la_SOURCES = $(libpng12_la_SOURCES)
@ -83,7 +83,7 @@ EXTRA_DIST= \
${srcdir}/contrib/pngsuite/* \
${srcdir}/contrib/visupng/* \
$(TESTS) \
example.c libpng.txt pngvcrd.c
example.c libpng.txt
CLEANFILES= pngout.png libpng12.pc libpng12-config libpng.vers \
libpng.sym

26
Makefile.in
View File

@ -87,8 +87,7 @@ am__objects_1 = libpng_la-png.lo libpng_la-pngset.lo \
libpng_la-pngread.lo libpng_la-pngrio.lo libpng_la-pngwio.lo \
libpng_la-pngwrite.lo libpng_la-pngrtran.lo \
libpng_la-pngwtran.lo libpng_la-pngmem.lo \
libpng_la-pngerror.lo libpng_la-pngpread.lo \
libpng_la-pnggccrd.lo
libpng_la-pngerror.lo libpng_la-pngpread.lo
am_libpng_la_OBJECTS = $(am__objects_1)
libpng_la_OBJECTS = $(am_libpng_la_OBJECTS)
libpng12_la_LIBADD =
@ -99,7 +98,7 @@ am_libpng12_la_OBJECTS = libpng12_la-png.lo libpng12_la-pngset.lo \
libpng12_la-pngwio.lo libpng12_la-pngwrite.lo \
libpng12_la-pngrtran.lo libpng12_la-pngwtran.lo \
libpng12_la-pngmem.lo libpng12_la-pngerror.lo \
libpng12_la-pngpread.lo libpng12_la-pnggccrd.lo
libpng12_la-pngpread.lo
libpng12_la_OBJECTS = $(am_libpng12_la_OBJECTS)
am_pngtest_OBJECTS = pngtest.$(OBJEXT)
pngtest_OBJECTS = $(am_pngtest_OBJECTS)
@ -184,7 +183,6 @@ INSTALL_STRIP_PROGRAM = @INSTALL_STRIP_PROGRAM@
LDFLAGS = @LDFLAGS@
LIBOBJS = @LIBOBJS@
LIBPNG_DEFINES = @LIBPNG_DEFINES@
LIBPNG_NO_MMX = @LIBPNG_NO_MMX@
LIBS = @LIBS@
LIBTOOL = @LIBTOOL@
LN_S = @LN_S@
@ -286,7 +284,7 @@ lib_LTLIBRARIES = libpng12.la @compatlib@
EXTRA_LTLIBRARIES = libpng.la
libpng12_la_SOURCES = png.c pngset.c pngget.c pngrutil.c pngtrans.c pngwutil.c \
pngread.c pngrio.c pngwio.c pngwrite.c pngrtran.c \
pngwtran.c pngmem.c pngerror.c pngpread.c pnggccrd.c \
pngwtran.c pngmem.c pngerror.c pngpread.c \
png.h pngconf.h
libpng_la_SOURCES = $(libpng12_la_SOURCES)
@ -322,7 +320,7 @@ EXTRA_DIST = \
${srcdir}/contrib/pngsuite/* \
${srcdir}/contrib/visupng/* \
$(TESTS) \
example.c libpng.txt pngvcrd.c
example.c libpng.txt
CLEANFILES = pngout.png libpng12.pc libpng12-config libpng.vers \
libpng.sym
@ -455,7 +453,6 @@ distclean-compile:
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libpng12_la-png.Plo@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libpng12_la-pngerror.Plo@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libpng12_la-pnggccrd.Plo@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libpng12_la-pngget.Plo@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libpng12_la-pngmem.Plo@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libpng12_la-pngpread.Plo@am__quote@
@ -471,7 +468,6 @@ distclean-compile:
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libpng12_la-pngwutil.Plo@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libpng_la-png.Plo@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libpng_la-pngerror.Plo@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libpng_la-pnggccrd.Plo@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libpng_la-pngget.Plo@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libpng_la-pngmem.Plo@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libpng_la-pngpread.Plo@am__quote@
@ -613,13 +609,6 @@ libpng_la-pngpread.lo: pngpread.c
@AMDEP_TRUE@@am__fastdepCC_FALSE@ DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
@am__fastdepCC_FALSE@ $(LIBTOOL) --mode=compile --tag=CC $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpng_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o libpng_la-pngpread.lo `test -f 'pngpread.c' || echo '$(srcdir)/'`pngpread.c
libpng_la-pnggccrd.lo: pnggccrd.c
@am__fastdepCC_TRUE@ if $(LIBTOOL) --mode=compile --tag=CC $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpng_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT libpng_la-pnggccrd.lo -MD -MP -MF "$(DEPDIR)/libpng_la-pnggccrd.Tpo" -c -o libpng_la-pnggccrd.lo `test -f 'pnggccrd.c' || echo '$(srcdir)/'`pnggccrd.c; \
@am__fastdepCC_TRUE@ then mv -f "$(DEPDIR)/libpng_la-pnggccrd.Tpo" "$(DEPDIR)/libpng_la-pnggccrd.Plo"; else rm -f "$(DEPDIR)/libpng_la-pnggccrd.Tpo"; exit 1; fi
@AMDEP_TRUE@@am__fastdepCC_FALSE@ source='pnggccrd.c' object='libpng_la-pnggccrd.lo' libtool=yes @AMDEPBACKSLASH@
@AMDEP_TRUE@@am__fastdepCC_FALSE@ DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
@am__fastdepCC_FALSE@ $(LIBTOOL) --mode=compile --tag=CC $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpng_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o libpng_la-pnggccrd.lo `test -f 'pnggccrd.c' || echo '$(srcdir)/'`pnggccrd.c
libpng12_la-png.lo: png.c
@am__fastdepCC_TRUE@ if $(LIBTOOL) --mode=compile --tag=CC $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpng12_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT libpng12_la-png.lo -MD -MP -MF "$(DEPDIR)/libpng12_la-png.Tpo" -c -o libpng12_la-png.lo `test -f 'png.c' || echo '$(srcdir)/'`png.c; \
@am__fastdepCC_TRUE@ then mv -f "$(DEPDIR)/libpng12_la-png.Tpo" "$(DEPDIR)/libpng12_la-png.Plo"; else rm -f "$(DEPDIR)/libpng12_la-png.Tpo"; exit 1; fi
@ -725,13 +714,6 @@ libpng12_la-pngpread.lo: pngpread.c
@AMDEP_TRUE@@am__fastdepCC_FALSE@ DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
@am__fastdepCC_FALSE@ $(LIBTOOL) --mode=compile --tag=CC $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpng12_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o libpng12_la-pngpread.lo `test -f 'pngpread.c' || echo '$(srcdir)/'`pngpread.c
libpng12_la-pnggccrd.lo: pnggccrd.c
@am__fastdepCC_TRUE@ if $(LIBTOOL) --mode=compile --tag=CC $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpng12_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT libpng12_la-pnggccrd.lo -MD -MP -MF "$(DEPDIR)/libpng12_la-pnggccrd.Tpo" -c -o libpng12_la-pnggccrd.lo `test -f 'pnggccrd.c' || echo '$(srcdir)/'`pnggccrd.c; \
@am__fastdepCC_TRUE@ then mv -f "$(DEPDIR)/libpng12_la-pnggccrd.Tpo" "$(DEPDIR)/libpng12_la-pnggccrd.Plo"; else rm -f "$(DEPDIR)/libpng12_la-pnggccrd.Tpo"; exit 1; fi
@AMDEP_TRUE@@am__fastdepCC_FALSE@ source='pnggccrd.c' object='libpng12_la-pnggccrd.lo' libtool=yes @AMDEPBACKSLASH@
@AMDEP_TRUE@@am__fastdepCC_FALSE@ DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
@am__fastdepCC_FALSE@ $(LIBTOOL) --mode=compile --tag=CC $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpng12_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o libpng12_la-pnggccrd.lo `test -f 'pnggccrd.c' || echo '$(srcdir)/'`pnggccrd.c
mostlyclean-libtool:
-rm -f *.lo

14
README
View File

@ -1,4 +1,4 @@
README for libpng version 1.2.20rc3 - August 30, 2007 (shared library 12.0)
README for libpng version 1.2.20rc4 - September 1, 2007 (shared library 12.0)
See the note about version numbers near the top of png.h
See INSTALL for instructions on how to install libpng.
@ -190,11 +190,11 @@ Files in this distribution:
descrip.mms => VMS makefile for MMS or MMK
makefile.std => Generic UNIX makefile (cc, creates static libpng.a)
makefile.elf => Linux/ELF makefile symbol versioning,
gcc, creates libpng12.so.0.1.2.20rc3)
gcc, creates libpng12.so.0.1.2.20rc4)
makefile.linux => Linux/ELF makefile
(gcc, creates libpng12.so.0.1.2.20rc3)
(gcc, creates libpng12.so.0.1.2.20rc4)
makefile.gcmmx => Linux/ELF makefile
(gcc, creates libpng12.so.0.1.2.20rc3,
(gcc, creates libpng12.so.0.1.2.20rc4,
uses assembler code tuned for Intel MMX platform)
makefile.gcc => Generic makefile (gcc, creates static libpng.a)
makefile.knr => Archaic UNIX Makefile that converts files with
@ -216,12 +216,12 @@ Files in this distribution:
makefile.openbsd => OpenBSD makefile
makefile.sgi => Silicon Graphics IRIX (cc, creates static lib)
makefile.sggcc => Silicon Graphics
(gcc, creates libpng12.so.0.1.2.20rc3)
(gcc, creates libpng12.so.0.1.2.20rc4)
makefile.sunos => Sun makefile
makefile.solaris => Solaris 2.X makefile
(gcc, creates libpng12.so.0.1.2.20rc3)
(gcc, creates libpng12.so.0.1.2.20rc4)
makefile.so9 => Solaris 9 makefile
(gcc, creates libpng12.so.0.1.2.20rc3)
(gcc, creates libpng12.so.0.1.2.20rc4)
makefile.32sunu => Sun Ultra 32-bit makefile
makefile.64sunu => Sun Ultra 64-bit makefile
makefile.sco => For SCO OSr5 ELF and Unixware 7 with Native cc

4
Y2KINFO
View File

@ -1,13 +1,13 @@
Y2K compliance in libpng:
=========================
August 30, 2007
September 1, 2007
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 1.2.20rc3 are Y2K compliant. It is my belief that earlier
upward through 1.2.20rc4 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

121
configure vendored
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@ -1,6 +1,6 @@
#! /bin/sh
# Guess values for system-dependent variables and create Makefiles.
# Generated by GNU Autoconf 2.61 for libpng 1.2.20rc3.
# Generated by GNU Autoconf 2.61 for libpng 1.2.20rc4.
#
# Report bugs to <png-mng-implement@lists.sourceforge.net>.
#
@ -728,8 +728,8 @@ SHELL=${CONFIG_SHELL-/bin/sh}
# Identity of this package.
PACKAGE_NAME='libpng'
PACKAGE_TARNAME='libpng'
PACKAGE_VERSION='1.2.20rc3'
PACKAGE_STRING='libpng 1.2.20rc3'
PACKAGE_VERSION='1.2.20rc4'
PACKAGE_STRING='libpng 1.2.20rc4'
PACKAGE_BUGREPORT='png-mng-implement@lists.sourceforge.net'
ac_unique_file="pngget.c"
@ -876,7 +876,6 @@ LIBTOOL
POW_LIB
LIBOBJS
LIBPNG_DEFINES
LIBPNG_NO_MMX
HAVE_LD_VERSION_SCRIPT_TRUE
HAVE_LD_VERSION_SCRIPT_FALSE
PNGLIB_VERSION
@ -1405,7 +1404,7 @@ if test "$ac_init_help" = "long"; then
# Omit some internal or obsolete options to make the list less imposing.
# This message is too long to be a string in the A/UX 3.1 sh.
cat <<_ACEOF
\`configure' configures libpng 1.2.20rc3 to adapt to many kinds of systems.
\`configure' configures libpng 1.2.20rc4 to adapt to many kinds of systems.
Usage: $0 [OPTION]... [VAR=VALUE]...
@ -1475,7 +1474,7 @@ fi
if test -n "$ac_init_help"; then
case $ac_init_help in
short | recursive ) echo "Configuration of libpng 1.2.20rc3:";;
short | recursive ) echo "Configuration of libpng 1.2.20rc4:";;
esac
cat <<\_ACEOF
@ -1585,7 +1584,7 @@ fi
test -n "$ac_init_help" && exit $ac_status
if $ac_init_version; then
cat <<\_ACEOF
libpng configure 1.2.20rc3
libpng configure 1.2.20rc4
generated by GNU Autoconf 2.61
Copyright (C) 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001,
@ -1599,7 +1598,7 @@ cat >config.log <<_ACEOF
This file contains any messages produced by compilers while
running configure, to aid debugging if configure makes a mistake.
It was created by libpng $as_me 1.2.20rc3, which was
It was created by libpng $as_me 1.2.20rc4, which was
generated by GNU Autoconf 2.61. Invocation command line was
$ $0 $@
@ -2269,7 +2268,7 @@ fi
# Define the identity of the package.
PACKAGE='libpng'
VERSION='1.2.20rc3'
VERSION='1.2.20rc4'
cat >>confdefs.h <<_ACEOF
@ -2440,7 +2439,7 @@ fi
PNGLIB_VERSION=1.2.20rc3
PNGLIB_VERSION=1.2.20rc4
PNGLIB_MAJOR=1
PNGLIB_MINOR=2
PNGLIB_RELEASE=20
@ -4788,7 +4787,7 @@ ia64-*-hpux*)
;;
*-*-irix6*)
# Find out which ABI we are using.
echo '#line 4791 "configure"' > conftest.$ac_ext
echo '#line 4790 "configure"' > conftest.$ac_ext
if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
(eval $ac_compile) 2>&5
ac_status=$?
@ -7301,11 +7300,11 @@ else
-e 's:.*FLAGS}\{0,1\} :&$lt_compiler_flag :; t' \
-e 's: [^ ]*conftest\.: $lt_compiler_flag&:; t' \
-e 's:$: $lt_compiler_flag:'`
(eval echo "\"\$as_me:7304: $lt_compile\"" >&5)
(eval echo "\"\$as_me:7303: $lt_compile\"" >&5)
(eval "$lt_compile" 2>conftest.err)
ac_status=$?
cat conftest.err >&5
echo "$as_me:7308: \$? = $ac_status" >&5
echo "$as_me:7307: \$? = $ac_status" >&5
if (exit $ac_status) && test -s "$ac_outfile"; then
# The compiler can only warn and ignore the option if not recognized
# So say no if there are warnings other than the usual output.
@ -7591,11 +7590,11 @@ else
-e 's:.*FLAGS}\{0,1\} :&$lt_compiler_flag :; t' \
-e 's: [^ ]*conftest\.: $lt_compiler_flag&:; t' \
-e 's:$: $lt_compiler_flag:'`
(eval echo "\"\$as_me:7594: $lt_compile\"" >&5)
(eval echo "\"\$as_me:7593: $lt_compile\"" >&5)
(eval "$lt_compile" 2>conftest.err)
ac_status=$?
cat conftest.err >&5
echo "$as_me:7598: \$? = $ac_status" >&5
echo "$as_me:7597: \$? = $ac_status" >&5
if (exit $ac_status) && test -s "$ac_outfile"; then
# The compiler can only warn and ignore the option if not recognized
# So say no if there are warnings other than the usual output.
@ -7695,11 +7694,11 @@ else
-e 's:.*FLAGS}\{0,1\} :&$lt_compiler_flag :; t' \
-e 's: [^ ]*conftest\.: $lt_compiler_flag&:; t' \
-e 's:$: $lt_compiler_flag:'`
(eval echo "\"\$as_me:7698: $lt_compile\"" >&5)
(eval echo "\"\$as_me:7697: $lt_compile\"" >&5)
(eval "$lt_compile" 2>out/conftest.err)
ac_status=$?
cat out/conftest.err >&5
echo "$as_me:7702: \$? = $ac_status" >&5
echo "$as_me:7701: \$? = $ac_status" >&5
if (exit $ac_status) && test -s out/conftest2.$ac_objext
then
# The compiler can only warn and ignore the option if not recognized
@ -10044,7 +10043,7 @@ else
lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
lt_status=$lt_dlunknown
cat > conftest.$ac_ext <<EOF
#line 10047 "configure"
#line 10046 "configure"
#include "confdefs.h"
#if HAVE_DLFCN_H
@ -10144,7 +10143,7 @@ else
lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
lt_status=$lt_dlunknown
cat > conftest.$ac_ext <<EOF
#line 10147 "configure"
#line 10146 "configure"
#include "confdefs.h"
#if HAVE_DLFCN_H
@ -12564,11 +12563,11 @@ else
-e 's:.*FLAGS}\{0,1\} :&$lt_compiler_flag :; t' \
-e 's: [^ ]*conftest\.: $lt_compiler_flag&:; t' \
-e 's:$: $lt_compiler_flag:'`
(eval echo "\"\$as_me:12567: $lt_compile\"" >&5)
(eval echo "\"\$as_me:12566: $lt_compile\"" >&5)
(eval "$lt_compile" 2>conftest.err)
ac_status=$?
cat conftest.err >&5
echo "$as_me:12571: \$? = $ac_status" >&5
echo "$as_me:12570: \$? = $ac_status" >&5
if (exit $ac_status) && test -s "$ac_outfile"; then
# The compiler can only warn and ignore the option if not recognized
# So say no if there are warnings other than the usual output.
@ -12668,11 +12667,11 @@ else
-e 's:.*FLAGS}\{0,1\} :&$lt_compiler_flag :; t' \
-e 's: [^ ]*conftest\.: $lt_compiler_flag&:; t' \
-e 's:$: $lt_compiler_flag:'`
(eval echo "\"\$as_me:12671: $lt_compile\"" >&5)
(eval echo "\"\$as_me:12670: $lt_compile\"" >&5)
(eval "$lt_compile" 2>out/conftest.err)
ac_status=$?
cat out/conftest.err >&5
echo "$as_me:12675: \$? = $ac_status" >&5
echo "$as_me:12674: \$? = $ac_status" >&5
if (exit $ac_status) && test -s out/conftest2.$ac_objext
then
# The compiler can only warn and ignore the option if not recognized
@ -14230,11 +14229,11 @@ else
-e 's:.*FLAGS}\{0,1\} :&$lt_compiler_flag :; t' \
-e 's: [^ ]*conftest\.: $lt_compiler_flag&:; t' \
-e 's:$: $lt_compiler_flag:'`
(eval echo "\"\$as_me:14233: $lt_compile\"" >&5)
(eval echo "\"\$as_me:14232: $lt_compile\"" >&5)
(eval "$lt_compile" 2>conftest.err)
ac_status=$?
cat conftest.err >&5
echo "$as_me:14237: \$? = $ac_status" >&5
echo "$as_me:14236: \$? = $ac_status" >&5
if (exit $ac_status) && test -s "$ac_outfile"; then
# The compiler can only warn and ignore the option if not recognized
# So say no if there are warnings other than the usual output.
@ -14334,11 +14333,11 @@ else
-e 's:.*FLAGS}\{0,1\} :&$lt_compiler_flag :; t' \
-e 's: [^ ]*conftest\.: $lt_compiler_flag&:; t' \
-e 's:$: $lt_compiler_flag:'`
(eval echo "\"\$as_me:14337: $lt_compile\"" >&5)
(eval echo "\"\$as_me:14336: $lt_compile\"" >&5)
(eval "$lt_compile" 2>out/conftest.err)
ac_status=$?
cat out/conftest.err >&5
echo "$as_me:14341: \$? = $ac_status" >&5
echo "$as_me:14340: \$? = $ac_status" >&5
if (exit $ac_status) && test -s out/conftest2.$ac_objext
then
# The compiler can only warn and ignore the option if not recognized
@ -16521,11 +16520,11 @@ else
-e 's:.*FLAGS}\{0,1\} :&$lt_compiler_flag :; t' \
-e 's: [^ ]*conftest\.: $lt_compiler_flag&:; t' \
-e 's:$: $lt_compiler_flag:'`
(eval echo "\"\$as_me:16524: $lt_compile\"" >&5)
(eval echo "\"\$as_me:16523: $lt_compile\"" >&5)
(eval "$lt_compile" 2>conftest.err)
ac_status=$?
cat conftest.err >&5
echo "$as_me:16528: \$? = $ac_status" >&5
echo "$as_me:16527: \$? = $ac_status" >&5
if (exit $ac_status) && test -s "$ac_outfile"; then
# The compiler can only warn and ignore the option if not recognized
# So say no if there are warnings other than the usual output.
@ -16811,11 +16810,11 @@ else
-e 's:.*FLAGS}\{0,1\} :&$lt_compiler_flag :; t' \
-e 's: [^ ]*conftest\.: $lt_compiler_flag&:; t' \
-e 's:$: $lt_compiler_flag:'`
(eval echo "\"\$as_me:16814: $lt_compile\"" >&5)
(eval echo "\"\$as_me:16813: $lt_compile\"" >&5)
(eval "$lt_compile" 2>conftest.err)
ac_status=$?
cat conftest.err >&5
echo "$as_me:16818: \$? = $ac_status" >&5
echo "$as_me:16817: \$? = $ac_status" >&5
if (exit $ac_status) && test -s "$ac_outfile"; then
# The compiler can only warn and ignore the option if not recognized
# So say no if there are warnings other than the usual output.
@ -16915,11 +16914,11 @@ else
-e 's:.*FLAGS}\{0,1\} :&$lt_compiler_flag :; t' \
-e 's: [^ ]*conftest\.: $lt_compiler_flag&:; t' \
-e 's:$: $lt_compiler_flag:'`
(eval echo "\"\$as_me:16918: $lt_compile\"" >&5)
(eval echo "\"\$as_me:16917: $lt_compile\"" >&5)
(eval "$lt_compile" 2>out/conftest.err)
ac_status=$?
cat out/conftest.err >&5
echo "$as_me:16922: \$? = $ac_status" >&5
echo "$as_me:16921: \$? = $ac_status" >&5
if (exit $ac_status) && test -s out/conftest2.$ac_objext
then
# The compiler can only warn and ignore the option if not recognized
@ -20713,55 +20712,6 @@ fi
LIBPNG_DEFINES=-DPNG_CONFIGURE_LIBPNG
{ echo "$as_me:$LINENO: checking if assembler code in pnggccrd.c can be compiled without PNG_NO_MMX_CODE" >&5
echo $ECHO_N "checking if assembler code in pnggccrd.c can be compiled without PNG_NO_MMX_CODE... $ECHO_C" >&6; }
cat >conftest.$ac_ext <<_ACEOF
/* confdefs.h. */
_ACEOF
cat confdefs.h >>conftest.$ac_ext
cat >>conftest.$ac_ext <<_ACEOF
/* end confdefs.h. */
#include "$srcdir/pnggccrd.c"
int
main ()
{
return 0;
;
return 0;
}
_ACEOF
rm -f conftest.$ac_objext
if { (ac_try="$ac_compile"
case "(($ac_try" in
*\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
*) ac_try_echo=$ac_try;;
esac
eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
(eval "$ac_compile") 2>conftest.er1
ac_status=$?
grep -v '^ *+' conftest.er1 >conftest.err
rm -f conftest.er1
cat conftest.err >&5
echo "$as_me:$LINENO: \$? = $ac_status" >&5
(exit $ac_status); } && {
test -z "$ac_c_werror_flag" ||
test ! -s conftest.err
} && test -s conftest.$ac_objext; then
{ echo "$as_me:$LINENO: result: yes" >&5
echo "${ECHO_T}yes" >&6; }
LIBPNG_NO_MMX=""
else
echo "$as_me: failed program was:" >&5
sed 's/^/| /' conftest.$ac_ext >&5
{ echo "$as_me:$LINENO: result: no" >&5
echo "${ECHO_T}no" >&6; }
LIBPNG_NO_MMX=-DPNG_NO_MMX_CODE
fi
rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
LIBPNG_DEFINES=$LIBPNG_DEFINES\ $LIBPNG_NO_MMX
{ echo "$as_me:$LINENO: checking if libraries can be versioned" >&5
@ -21282,7 +21232,7 @@ exec 6>&1
# report actual input values of CONFIG_FILES etc. instead of their
# values after options handling.
ac_log="
This file was extended by libpng $as_me 1.2.20rc3, which was
This file was extended by libpng $as_me 1.2.20rc4, which was
generated by GNU Autoconf 2.61. Invocation command line was
CONFIG_FILES = $CONFIG_FILES
@ -21335,7 +21285,7 @@ Report bugs to <bug-autoconf@gnu.org>."
_ACEOF
cat >>$CONFIG_STATUS <<_ACEOF
ac_cs_version="\\
libpng config.status 1.2.20rc3
libpng config.status 1.2.20rc4
configured by $0, generated by GNU Autoconf 2.61,
with options \\"`echo "$ac_configure_args" | sed 's/^ //; s/[\\""\`\$]/\\\\&/g'`\\"
@ -21663,7 +21613,6 @@ LIBTOOL!$LIBTOOL$ac_delim
POW_LIB!$POW_LIB$ac_delim
LIBOBJS!$LIBOBJS$ac_delim
LIBPNG_DEFINES!$LIBPNG_DEFINES$ac_delim
LIBPNG_NO_MMX!$LIBPNG_NO_MMX$ac_delim
HAVE_LD_VERSION_SCRIPT_TRUE!$HAVE_LD_VERSION_SCRIPT_TRUE$ac_delim
HAVE_LD_VERSION_SCRIPT_FALSE!$HAVE_LD_VERSION_SCRIPT_FALSE$ac_delim
PNGLIB_VERSION!$PNGLIB_VERSION$ac_delim
@ -21676,7 +21625,7 @@ compatlib!$compatlib$ac_delim
LTLIBOBJS!$LTLIBOBJS$ac_delim
_ACEOF
if test `sed -n "s/.*$ac_delim\$/X/p" conf$$subs.sed | grep -c X` = 21; then
if test `sed -n "s/.*$ac_delim\$/X/p" conf$$subs.sed | grep -c X` = 20; then
break
elif $ac_last_try; then
{ { echo "$as_me:$LINENO: error: could not make $CONFIG_STATUS" >&5

15
configure.ac
View File

@ -18,12 +18,12 @@ AC_PREREQ(2.59)
dnl Version number stuff here:
AC_INIT([libpng], [1.2.20rc3], [png-mng-implement@lists.sourceforge.net])
AC_INIT([libpng], [1.2.20rc4], [png-mng-implement@lists.sourceforge.net])
AM_INIT_AUTOMAKE
dnl stop configure from automagically running automake
AM_MAINTAINER_MODE
PNGLIB_VERSION=1.2.20rc3
PNGLIB_VERSION=1.2.20rc4
PNGLIB_MAJOR=1
PNGLIB_MINOR=2
PNGLIB_RELEASE=20
@ -59,18 +59,7 @@ AC_CHECK_FUNCS([pow], , AC_CHECK_LIB(m, pow, , AC_ERROR([cannot find pow])) )
AC_CHECK_LIB(z, zlibVersion, , AC_ERROR([zlib not installed]))
LIBPNG_DEFINES=-DPNG_CONFIGURE_LIBPNG
AC_MSG_CHECKING(
[if assembler code in pnggccrd.c can be compiled without PNG_NO_MMX_CODE])
AC_TRY_COMPILE(
[#include "$srcdir/pnggccrd.c"],
[return 0;],
AC_MSG_RESULT(yes)
LIBPNG_NO_MMX="",
AC_MSG_RESULT(no)
LIBPNG_NO_MMX=-DPNG_NO_MMX_CODE)
LIBPNG_DEFINES=$LIBPNG_DEFINES\ $LIBPNG_NO_MMX
AC_SUBST(LIBPNG_DEFINES)
AC_SUBST(LIBPNG_NO_MMX)
AC_MSG_CHECKING([if libraries can be versioned])
GLD=`$LD --help < /dev/null 2>/dev/null | grep version-script`

184
libpng-1.2.20rc3.txt → libpng-1.2.20rc4.txt
View File

@ -1,6 +1,6 @@
libpng.txt - A description on how to use and modify libpng
libpng version 1.2.20rc3 - August 30, 2007
libpng version 1.2.20rc4 - September 1, 2007
Updated and distributed by Glenn Randers-Pehrson
<glennrp at users.sourceforge.net>
Copyright (c) 1998-2007 Glenn Randers-Pehrson
@ -86,9 +86,7 @@ Libpng is thread safe, provided the threads are using different
instances of the structures. Each thread should have its own
png_struct and png_info instances, and thus its own image.
Libpng does not protect itself against two threads using the
same instance of a structure. Note: thread safety may be defeated
by use of some of the MMX assembler code in pnggccrd.c, which is only
compiled when the user defines PNG_THREAD_UNSAFE_OK.
same instance of a structure.
II. Structures
@ -2355,17 +2353,13 @@ For a more compact example of writing a PNG image, see the file example.c.
V. Modifying/Customizing libpng:
There are three issues here. The first is changing how libpng does
There are two issues here. The first is changing how libpng does
standard things like memory allocation, input/output, and error handling.
The second deals with more complicated things like adding new chunks,
adding new transformations, and generally changing how libpng works.
Both of those are compile-time issues; that is, they are generally
determined at the time the code is written, and there is rarely a need
to provide the user with a means of changing them. The third is a
run-time issue: choosing between and/or tuning one or more alternate
versions of computationally intensive routines; specifically, optimized
assembly-language (and therefore compiler- and platform-dependent)
versions.
to provide the user with a means of changing them.
Memory allocation, input/output, and error handling
@ -2726,172 +2720,6 @@ When PNG_DEBUG = 1, the macros are defined, but only png_debug statements
having level = 0 will be printed. There aren't any such statements in
this version of libpng, but if you insert some they will be printed.
VI. Runtime optimization
A new feature in libpng 1.2.0 is the ability to dynamically switch between
standard and optimized versions of some routines. Currently these are
limited to three computationally intensive tasks when reading PNG files:
decoding row filters, expanding interlacing, and combining interlaced or
transparent row data with previous row data. Currently the optimized
versions are available only for x86 (Intel, AMD, etc.) platforms with
MMX support, though this may change in future versions. (For example,
the non-MMX assembler optimizations for zlib might become similarly
runtime-selectable in future releases, in which case libpng could be
extended to support them. Alternatively, the compile-time choice of
floating-point versus integer routines for gamma correction might become
runtime-selectable.)
Because such optimizations tend to be very platform- and compiler-dependent,
both in how they are written and in how they perform, the new runtime code
in libpng has been written to allow programs to query, enable, and disable
either specific optimizations or all such optimizations. For example, to
enable all possible optimizations (bearing in mind that some "optimizations"
may actually run more slowly in rare cases):
#if defined(PNG_LIBPNG_VER) && (PNG_LIBPNG_VER >= 10200)
png_uint_32 mask, flags;
flags = png_get_asm_flags(png_ptr);
mask = png_get_asm_flagmask(PNG_SELECT_READ | PNG_SELECT_WRITE);
png_set_asm_flags(png_ptr, flags | mask);
#endif
To enable only optimizations relevant to reading PNGs, use PNG_SELECT_READ
by itself when calling png_get_asm_flagmask(); similarly for optimizing
only writing. To disable all optimizations:
#if defined(PNG_LIBPNG_VER) && (PNG_LIBPNG_VER >= 10200)
flags = png_get_asm_flags(png_ptr);
mask = png_get_asm_flagmask(PNG_SELECT_READ | PNG_SELECT_WRITE);
png_set_asm_flags(png_ptr, flags & ~mask);
#endif
To enable or disable only MMX-related features, use png_get_mmx_flagmask()
in place of png_get_asm_flagmask(). The mmx version takes one additional
parameter:
#if defined(PNG_LIBPNG_VER) && (PNG_LIBPNG_VER >= 10200)
int selection = PNG_SELECT_READ | PNG_SELECT_WRITE;
int compilerID;
mask = png_get_mmx_flagmask(selection, &compilerID);
#endif
On return, compilerID will indicate which version of the MMX assembler
optimizations was compiled. Currently two flavors exist: Microsoft
Visual C++ (compilerID == 1) and GNU C (a.k.a. gcc/gas, compilerID == 2).
On non-x86 platforms or on systems compiled without MMX optimizations, a
value of -1 is used.
Note that both png_get_asm_flagmask() and png_get_mmx_flagmask() return
all valid, settable optimization bits for the version of the library that's
currently in use. In the case of shared (dynamically linked) libraries,
this may include optimizations that did not exist at the time the code was
written and compiled. It is also possible, of course, to enable only known,
specific optimizations; for example:
#if defined(PNG_LIBPNG_VER) && (PNG_LIBPNG_VER >= 10200) && \
defined(PNG_USE_PNGGCCRD) && defined(PNG_ASSEMBLER_CODE_SUPPORTED)
flags = PNG_ASM_FLAG_MMX_READ_COMBINE_ROW \
| PNG_ASM_FLAG_MMX_READ_INTERLACE \
| PNG_ASM_FLAG_MMX_READ_FILTER_SUB \
| PNG_ASM_FLAG_MMX_READ_FILTER_UP \
| PNG_ASM_FLAG_MMX_READ_FILTER_AVG \
| PNG_ASM_FLAG_MMX_READ_FILTER_PAETH ;
png_set_asm_flags(png_ptr, flags);
#endif
This method would enable only the MMX read-optimizations available at the
time of libpng 1.2.0's release, regardless of whether a later version of
the DLL were actually being used. (Also note that these functions did not
exist in versions older than 1.2.0, so any attempt to run a dynamically
linked app on such an older version would fail.)
To determine whether the processor supports MMX instructions at all, use
the png_mmx_support() function:
#if defined(PNG_LIBPNG_VER) && (PNG_LIBPNG_VER >= 10200)
mmxsupport = png_mmx_support();
#endif
It returns -1 if MMX support is not compiled into libpng, 0 if MMX code
is compiled but MMX is not supported by the processor, or 1 if MMX support
is fully available. Note that png_mmx_support(), png_get_mmx_flagmask(),
and png_get_asm_flagmask() all may be called without allocating and ini-
tializing any PNG structures (for example, as part of a usage screen or
"about" box).
The following code can be used to prevent an application from using the
thread_unsafe features, even if libpng was built with PNG_THREAD_UNSAFE_OK
defined:
#if defined(PNG_USE_PNGGCCRD) && defined(PNG_ASSEMBLER_CODE_SUPPORTED) \
&& defined(PNG_THREAD_UNSAFE_OK)
/* Disable thread-unsafe features of pnggccrd */
if (png_access_version_number() >= 10200)
{
png_uint_32 mmx_disable_mask = 0;
png_uint_32 asm_flags;
mmx_disable_mask |= ( PNG_ASM_FLAG_MMX_READ_COMBINE_ROW \
| PNG_ASM_FLAG_MMX_READ_FILTER_SUB \
| PNG_ASM_FLAG_MMX_READ_FILTER_AVG \
| PNG_ASM_FLAG_MMX_READ_FILTER_PAETH );
asm_flags = png_get_asm_flags(png_ptr);
png_set_asm_flags(png_ptr, asm_flags & ~mmx_disable_mask);
}
#endif
For more extensive examples of runtime querying, enabling and disabling
of optimized features, see contrib/gregbook/readpng2.c in the libpng
source-code distribution.
It is also possible to disable or enable specific optimization features
at compile time. To disable them entirely, which may result in slower
but smaller and less complex and troublesome code, define
PNG_NO_ASSEMBLER_CODE
If you do this, then the run-time code for setting and querying flags
described above, and the assembler code in pnggccrd.c or pngvcrd.c will
not be built.
If you have disabled the assembler code, you can also disable the
optimized C code, to obtain even slower but smaller code, by defining
PNG_NO_OPTIMZED_CODE
To disable only the MMX assembler code, define
PNG_NO_MMX_CODE
There are two versions of the MMX code: one for gcc compilers and one for
MSVC compilers. Pngconf.h should automatically detect which you are
using, and it will set either PNG_USE_PNGGCCRD or PNG_USE_PNGVCRD for you.
Define one or more of the following to disable specific parts of the
assembler code:
PNG_NO_MMX_COMBINE_ROW
PNG_NO_MMX_READ_INTERLACE
PNG_NO_MMX_READ_FILTER_ROW
If the latter is not disabled, you can disable one or more of the
individual filter types by defining
PNG_NO_MMX_FILTER_SUB
PNG_NO_MMX_FILTER_UP
PNG_NO_MMX_FILTER_AVG
PNG_NO_MMX_FILTER_PAETH
By default, libpng only enables the "sub" filter when gcc-3.x is used
because experiments show that gcc-3.x produces bad code for the others.
When you disable various MMX features, libpng will still be able to decode
files with those features. It will fall back upon the optimized C code
or the unoptimized C code to decode them.
VII. MNG support
The MNG specification (available at http://www.libpng.org/pub/mng) allows
@ -2968,13 +2796,13 @@ application:
IX. Y2K Compliance in libpng
August 30, 2007
September 1, 2007
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 1.2.20rc3 are Y2K compliant. It is my belief that earlier
upward through 1.2.20rc4 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

198
libpng.3
View File

@ -1,6 +1,6 @@
.TH LIBPNG 3 "August 30, 2007"
.TH LIBPNG 3 "September 1, 2007"
.SH NAME
libpng \- Portable Network Graphics (PNG) Reference Library 1.2.20rc3
libpng \- Portable Network Graphics (PNG) Reference Library 1.2.20rc4
.SH SYNOPSIS
\fB
#include <png.h>\fP
@ -410,7 +410,7 @@ Following is a copy of the libpng.txt file that accompanies libpng.
.SH LIBPNG.TXT
libpng.txt - A description on how to use and modify libpng
libpng version 1.2.20rc3 - August 30, 2007
libpng version 1.2.20rc4 - September 1, 2007
Updated and distributed by Glenn Randers-Pehrson
<glennrp at users.sourceforge.net>
Copyright (c) 1998-2007 Glenn Randers-Pehrson
@ -496,9 +496,7 @@ Libpng is thread safe, provided the threads are using different
instances of the structures. Each thread should have its own
png_struct and png_info instances, and thus its own image.
Libpng does not protect itself against two threads using the
same instance of a structure. Note: thread safety may be defeated
by use of some of the MMX assembler code in pnggccrd.c, which is only
compiled when the user defines PNG_THREAD_UNSAFE_OK.
same instance of a structure.
.SH II. Structures
@ -2765,17 +2763,13 @@ For a more compact example of writing a PNG image, see the file example.c.
.SH V. Modifying/Customizing libpng:
There are three issues here. The first is changing how libpng does
There are two issues here. The first is changing how libpng does
standard things like memory allocation, input/output, and error handling.
The second deals with more complicated things like adding new chunks,
adding new transformations, and generally changing how libpng works.
Both of those are compile-time issues; that is, they are generally
determined at the time the code is written, and there is rarely a need
to provide the user with a means of changing them. The third is a
run-time issue: choosing between and/or tuning one or more alternate
versions of computationally intensive routines; specifically, optimized
assembly-language (and therefore compiler- and platform-dependent)
versions.
to provide the user with a means of changing them.
Memory allocation, input/output, and error handling
@ -3136,172 +3130,6 @@ When PNG_DEBUG = 1, the macros are defined, but only png_debug statements
having level = 0 will be printed. There aren't any such statements in
this version of libpng, but if you insert some they will be printed.
.SH VI. Runtime optimization
A new feature in libpng 1.2.0 is the ability to dynamically switch between
standard and optimized versions of some routines. Currently these are
limited to three computationally intensive tasks when reading PNG files:
decoding row filters, expanding interlacing, and combining interlaced or
transparent row data with previous row data. Currently the optimized
versions are available only for x86 (Intel, AMD, etc.) platforms with
MMX support, though this may change in future versions. (For example,
the non-MMX assembler optimizations for zlib might become similarly
runtime-selectable in future releases, in which case libpng could be
extended to support them. Alternatively, the compile-time choice of
floating-point versus integer routines for gamma correction might become
runtime-selectable.)
Because such optimizations tend to be very platform- and compiler-dependent,
both in how they are written and in how they perform, the new runtime code
in libpng has been written to allow programs to query, enable, and disable
either specific optimizations or all such optimizations. For example, to
enable all possible optimizations (bearing in mind that some "optimizations"
may actually run more slowly in rare cases):
#if defined(PNG_LIBPNG_VER) && (PNG_LIBPNG_VER >= 10200)
png_uint_32 mask, flags;
flags = png_get_asm_flags(png_ptr);
mask = png_get_asm_flagmask(PNG_SELECT_READ | PNG_SELECT_WRITE);
png_set_asm_flags(png_ptr, flags | mask);
#endif
To enable only optimizations relevant to reading PNGs, use PNG_SELECT_READ
by itself when calling png_get_asm_flagmask(); similarly for optimizing
only writing. To disable all optimizations:
#if defined(PNG_LIBPNG_VER) && (PNG_LIBPNG_VER >= 10200)
flags = png_get_asm_flags(png_ptr);
mask = png_get_asm_flagmask(PNG_SELECT_READ | PNG_SELECT_WRITE);
png_set_asm_flags(png_ptr, flags & ~mask);
#endif
To enable or disable only MMX-related features, use png_get_mmx_flagmask()
in place of png_get_asm_flagmask(). The mmx version takes one additional
parameter:
#if defined(PNG_LIBPNG_VER) && (PNG_LIBPNG_VER >= 10200)
int selection = PNG_SELECT_READ | PNG_SELECT_WRITE;
int compilerID;
mask = png_get_mmx_flagmask(selection, &compilerID);
#endif
On return, compilerID will indicate which version of the MMX assembler
optimizations was compiled. Currently two flavors exist: Microsoft
Visual C++ (compilerID == 1) and GNU C (a.k.a. gcc/gas, compilerID == 2).
On non-x86 platforms or on systems compiled without MMX optimizations, a
value of -1 is used.
Note that both png_get_asm_flagmask() and png_get_mmx_flagmask() return
all valid, settable optimization bits for the version of the library that's
currently in use. In the case of shared (dynamically linked) libraries,
this may include optimizations that did not exist at the time the code was
written and compiled. It is also possible, of course, to enable only known,
specific optimizations; for example:
#if defined(PNG_LIBPNG_VER) && (PNG_LIBPNG_VER >= 10200) && \
defined(PNG_USE_PNGGCCRD) && defined(PNG_ASSEMBLER_CODE_SUPPORTED)
flags = PNG_ASM_FLAG_MMX_READ_COMBINE_ROW \
| PNG_ASM_FLAG_MMX_READ_INTERLACE \
| PNG_ASM_FLAG_MMX_READ_FILTER_SUB \
| PNG_ASM_FLAG_MMX_READ_FILTER_UP \
| PNG_ASM_FLAG_MMX_READ_FILTER_AVG \
| PNG_ASM_FLAG_MMX_READ_FILTER_PAETH ;
png_set_asm_flags(png_ptr, flags);
#endif
This method would enable only the MMX read-optimizations available at the
time of libpng 1.2.0's release, regardless of whether a later version of
the DLL were actually being used. (Also note that these functions did not
exist in versions older than 1.2.0, so any attempt to run a dynamically
linked app on such an older version would fail.)
To determine whether the processor supports MMX instructions at all, use
the png_mmx_support() function:
#if defined(PNG_LIBPNG_VER) && (PNG_LIBPNG_VER >= 10200)
mmxsupport = png_mmx_support();
#endif
It returns -1 if MMX support is not compiled into libpng, 0 if MMX code
is compiled but MMX is not supported by the processor, or 1 if MMX support
is fully available. Note that png_mmx_support(), png_get_mmx_flagmask(),
and png_get_asm_flagmask() all may be called without allocating and ini-
tializing any PNG structures (for example, as part of a usage screen or
"about" box).
The following code can be used to prevent an application from using the
thread_unsafe features, even if libpng was built with PNG_THREAD_UNSAFE_OK
defined:
#if defined(PNG_USE_PNGGCCRD) && defined(PNG_ASSEMBLER_CODE_SUPPORTED) \
&& defined(PNG_THREAD_UNSAFE_OK)
/* Disable thread-unsafe features of pnggccrd */
if (png_access_version_number() >= 10200)
{
png_uint_32 mmx_disable_mask = 0;
png_uint_32 asm_flags;
mmx_disable_mask |= ( PNG_ASM_FLAG_MMX_READ_COMBINE_ROW \
| PNG_ASM_FLAG_MMX_READ_FILTER_SUB \
| PNG_ASM_FLAG_MMX_READ_FILTER_AVG \
| PNG_ASM_FLAG_MMX_READ_FILTER_PAETH );
asm_flags = png_get_asm_flags(png_ptr);
png_set_asm_flags(png_ptr, asm_flags & ~mmx_disable_mask);
}
#endif
For more extensive examples of runtime querying, enabling and disabling
of optimized features, see contrib/gregbook/readpng2.c in the libpng
source-code distribution.
It is also possible to disable or enable specific optimization features
at compile time. To disable them entirely, which may result in slower
but smaller and less complex and troublesome code, define
PNG_NO_ASSEMBLER_CODE
If you do this, then the run-time code for setting and querying flags
described above, and the assembler code in pnggccrd.c or pngvcrd.c will
not be built.
If you have disabled the assembler code, you can also disable the
optimized C code, to obtain even slower but smaller code, by defining
PNG_NO_OPTIMZED_CODE
To disable only the MMX assembler code, define
PNG_NO_MMX_CODE
There are two versions of the MMX code: one for gcc compilers and one for
MSVC compilers. Pngconf.h should automatically detect which you are
using, and it will set either PNG_USE_PNGGCCRD or PNG_USE_PNGVCRD for you.
Define one or more of the following to disable specific parts of the
assembler code:
PNG_NO_MMX_COMBINE_ROW
PNG_NO_MMX_READ_INTERLACE
PNG_NO_MMX_READ_FILTER_ROW
If the latter is not disabled, you can disable one or more of the
individual filter types by defining
PNG_NO_MMX_FILTER_SUB
PNG_NO_MMX_FILTER_UP
PNG_NO_MMX_FILTER_AVG
PNG_NO_MMX_FILTER_PAETH
By default, libpng only enables the "sub" filter when gcc-3.x is used
because experiments show that gcc-3.x produces bad code for the others.
When you disable various MMX features, libpng will still be able to decode
files with those features. It will fall back upon the optimized C code
or the unoptimized C code to decode them.
.SH VII. MNG support
The MNG specification (available at http://www.libpng.org/pub/mng) allows
@ -3378,13 +3206,13 @@ application:
.SH IX. Y2K Compliance in libpng
August 30, 2007
September 1, 2007
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 1.2.20rc3 are Y2K compliant. It is my belief that earlier
upward through 1.2.20rc4 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
@ -3579,8 +3407,8 @@ the first widely used release:
1.0.27 10 10027 10.so.0.27[.0]
1.2.19 13 10219 12.so.0.19[.0]
1.2.20beta01-04 13 10220 12.so.0.20[.0]
1.0.28rc1-2 10 10028 10.so.0.28[.0]
1.2.20rc1-2 13 10220 12.so.0.20[.0]
1.0.28rc1-4 10 10028 10.so.0.28[.0]
1.2.20rc1-4 13 10220 12.so.0.20[.0]
1.0.28 10 10028 10.so.0.28[.0]
1.2.20 13 10220 12.so.0.20[.0]
@ -3638,7 +3466,7 @@ possible without all of you.
Thanks to Frank J. T. Wojcik for helping with the documentation.
Libpng version 1.2.20rc3 - August 30, 2007:
Libpng version 1.2.20rc4 - September 1, 2007:
Initially created in 1995 by Guy Eric Schalnat, then of Group 42, Inc.
Currently maintained by Glenn Randers-Pehrson (glennrp at users.sourceforge.net).
@ -3659,7 +3487,7 @@ included in the libpng distribution, the latter shall prevail.)
If you modify libpng you may insert additional notices immediately following
this sentence.
libpng versions 1.2.6, August 15, 2004, through 1.2.20rc3, August 30, 2007, are
libpng versions 1.2.6, August 15, 2004, through 1.2.20rc4, September 1, 2007, are
Copyright (c) 2004,2006-2007 Glenn Randers-Pehrson, and are
distributed according to the same disclaimer and license as libpng-1.2.5
with the following individual added to the list of Contributing Authors
@ -3758,7 +3586,7 @@ certification mark of the Open Source Initiative.
Glenn Randers-Pehrson
glennrp at users.sourceforge.net
August 30, 2007
September 1, 2007
.\" end of man page

4
libpngpf.3
View File

@ -1,6 +1,6 @@
.TH LIBPNGPF 3 "August 30, 2007"
.TH LIBPNGPF 3 "September 1, 2007"
.SH NAME
libpng \- Portable Network Graphics (PNG) Reference Library 1.2.20rc3
libpng \- Portable Network Graphics (PNG) Reference Library 1.2.20rc4
(private functions)
.SH SYNOPSIS
\fB#include <png.h>\fP

2
png.5
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@ -1,4 +1,4 @@
.TH PNG 5 "August 30, 2007"
.TH PNG 5 "September 1, 2007"
.SH NAME
png \- Portable Network Graphics (PNG) format
.SH DESCRIPTION

52
png.c
View File

@ -13,7 +13,7 @@
#include "png.h"
/* Generate a compiler error if there is an old png.h in the search path. */
typedef version_1_2_20rc3 Your_png_h_is_not_version_1_2_20rc3;
typedef version_1_2_20rc4 Your_png_h_is_not_version_1_2_20rc4;
/* Version information for C files. This had better match the version
* string defined in png.h. */
@ -67,11 +67,6 @@ PNG_CONST int FARDATA png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1};
/* offset to next interlace block in the y direction */
PNG_CONST int FARDATA png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2};
/* width of interlace block (used in assembler routines only) */
#if defined(PNG_HAVE_MMX_COMBINE_ROW) || defined(PNG_OPTIMIZED_CODE_SUPPORTED)
PNG_CONST int FARDATA png_pass_width[] = {8, 4, 4, 2, 2, 1, 1};
#endif
/* Height of interlace block. This is not currently used - if you need
* it, uncomment it here and in png.h
PNG_CONST int FARDATA png_pass_height[] = {8, 8, 4, 4, 2, 2, 1};
@ -698,7 +693,7 @@ png_charp PNGAPI
png_get_copyright(png_structp png_ptr)
{
png_ptr = png_ptr; /* silence compiler warning about unused png_ptr */
return ((png_charp) "\n libpng version 1.2.20rc3 - August 30, 2007\n\
return ((png_charp) "\n libpng version 1.2.20rc4 - September 1, 2007\n\
Copyright (c) 1998-2007 Glenn Randers-Pehrson\n\
Copyright (c) 1996-1997 Andreas Dilger\n\
Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.\n");
@ -825,57 +820,18 @@ png_access_version_number(void)
void /* PRIVATE */
png_init_mmx_flags (png_structp png_ptr)
{
if(png_ptr == NULL) return;
png_ptr->mmx_rowbytes_threshold = 0;
png_ptr->mmx_bitdepth_threshold = 0;
# if (defined(PNG_USE_PNGVCRD) || defined(PNG_USE_PNGGCCRD))
png_ptr->asm_flags |= PNG_ASM_FLAG_MMX_SUPPORT_COMPILED;
if (png_mmx_support() > 0) {
png_ptr->asm_flags |= PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU
# ifdef PNG_HAVE_MMX_COMBINE_ROW
| PNG_ASM_FLAG_MMX_READ_COMBINE_ROW
# endif
# ifdef PNG_HAVE_MMX_READ_INTERLACE
| PNG_ASM_FLAG_MMX_READ_INTERLACE
# endif
# ifndef PNG_HAVE_MMX_READ_FILTER_ROW
;
# else
| PNG_ASM_FLAG_MMX_READ_FILTER_SUB
| PNG_ASM_FLAG_MMX_READ_FILTER_UP
| PNG_ASM_FLAG_MMX_READ_FILTER_AVG
| PNG_ASM_FLAG_MMX_READ_FILTER_PAETH ;
png_ptr->mmx_rowbytes_threshold = PNG_MMX_ROWBYTES_THRESHOLD_DEFAULT;
png_ptr->mmx_bitdepth_threshold = PNG_MMX_BITDEPTH_THRESHOLD_DEFAULT;
# endif
} else {
png_ptr->asm_flags &= ~( PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU
| PNG_MMX_READ_FLAGS
| PNG_MMX_WRITE_FLAGS );
}
# else /* !(PNGVCRD || PNGGCCRD) */
/* clear all MMX flags; no support is compiled in */
png_ptr->asm_flags &= ~( PNG_MMX_FLAGS );
# endif /* ?(PNGVCRD || PNGGCCRD) */
/* obsolete, to be removed from libpng-1.4.0 */
}
#endif /* !(PNG_MMX_CODE_SUPPORTED) */
/* this function was added to libpng 1.2.0 */
#if !defined(PNG_USE_PNGGCCRD) && !defined(PNG_USE_PNGVCRD)
int PNGAPI
png_mmx_support(void)
{
/* obsolete, to be removed from libpng-1.4.0 */
return -1;
}
#endif
#endif /* PNG_1_0_X */
#endif /* PNG_READ_SUPPORTED && PNG_ASSEMBLER_CODE_SUPPORTED */

28
png.h
View File

@ -1,7 +1,7 @@
/* png.h - header file for PNG reference library
*
* libpng version 1.2.20rc3 - August 30, 2007
* libpng version 1.2.20rc4 - September 1, 2007
* Copyright (c) 1998-2007 Glenn Randers-Pehrson
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
@ -9,7 +9,7 @@
* Authors and maintainers:
* libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat