Imported from libpng-0.97c.tar
This commit is contained in:
Glenn Randers-Pehrson
parent
70e3f543f1
commit
2687fcc7b5
16
CHANGES
16
CHANGES
@ -167,21 +167,23 @@ version 0.96 [May, 1997]
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added read of CRC after IEND chunk for embedded PNGs (Laszlo Nyul)
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added typecasts to quiet compiler errors
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added more debugging info
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version 1.00 [not distributed, but Andreas handed off to G&G]
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skipped version 1.00 to avoid potential problems with shared libraries
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created with version 0.89
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version 0.97 [January, 1998]
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removed PNG_USE_OWN_CRC capability
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relocated png_set_crc_action from pngrutil.c to pngrtran.c
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fixed typecasts of "new_key" etc.
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fixed typecasts of "new_key", etc.
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added RFC 1152 date support
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version 1.00.97 [Dec 1997]
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fixed bug in gamma handling of 4-bit grayscale
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added more typecasts. 65536L becomes (png_uint_32)65536L, etc.
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minor corrections in libpng.txt
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added simple sRGB support
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make it simpler to do conditional compiling
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make it simpler to do conditional compiling: PNG_READ_NOT_FULLY_SUPPORTED
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fixed memory leak in pngwrite.c (free info_ptr->text)
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added more conditions for png_do_background, to avoid changing
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black pixels to background when a background is supplied and
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no pixels are transparent
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include stdio.h in pngconf.h even when PNG_NO_STDIO is defined.
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repaired PNG_NO_STDIO behaviour
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tested NODIV support and made it default behaviour
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added "-m" option to pngtest
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[anything else? 2-bit grayscale gamma bug?]
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regularized version numbering scheme and bumped shared-library major
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version number to 2 to avoid potential problems with libpng 0.89 apps
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17
README
17
README
@ -1,23 +1,22 @@
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README for libpng 1.10
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[NOTE: this is still beta version 0.97c; the text below has already
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been updated in anticipation of the imminent 1.0 release.]
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This first official release of libpng. Don't let the fact that
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README for libpng 1.0
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This is the first official release of libpng. Don't let the fact that
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it's the first release fool you. The libpng library has been in
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extensive use and testing for about two years. However, it's
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finally gotten to the stage where there haven't been significant
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changes to the API in some time, and people have a bad feeling about
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libraries with versions < 1.0.
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Note that the version number is 1.10 to avoid potential problems
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with shared libraries created for Linux ELF under version 0.89,
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which mistakenly used 1.0.89 as the library version number in
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false anticipation of an imminent 1.0 release.
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****
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Note that some of the changes to the png_info structure render this
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version of the library binary incompatible with libpng-0.89 or
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earlier versions if you are using a shared library. The type of the
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"filler" parameter for png_set_filler() has changed from png_byte to
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png_uint_32, which will affect shared-library applications which use
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png_uint_32, which will affect shared-library applications that use
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this function.
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To avoid problems with changes to the internals of png_info_struct,
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@ -28,7 +27,7 @@ accessing/storing the info_struct data, rather than manipulating it
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directly, to avoid such problems in the future.
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It is important to note that the APIs do not make current programs
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which access the info struct directly incompatible with the new
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that access the info struct directly incompatible with the new
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library. However, it is strongly suggested that new programs use
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the new APIs (as shown in example.c), and older programs be converted
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to the new format, to facilitate upgrades in the future.
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68
makefile
68
makefile
@ -1,68 +0,0 @@
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# makefile for libpng
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# Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
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# For conditions of distribution and use, see copyright notice in png.h
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# Where the zlib library and include files are located
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#ZLIBLIB=/usr/local/lib
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#ZLIBINC=/usr/local/include
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ZLIBLIB=../zlib
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ZLIBINC=../zlib
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CC=cc
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CFLAGS=-I$(ZLIBINC) -O # -g -DPNG_DEBUG=1
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LDFLAGS=-L. -L$(ZLIBLIB) -lpng -lz -lm
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#RANLIB=echo
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RANLIB=ranlib
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# where make install puts libpng.a and png.h
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prefix=/usr/local
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OBJS = png.o pngset.o pngget.o pngrutil.o pngtrans.o pngwutil.o \
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pngread.o pngrio.o pngwio.o pngwrite.o pngrtran.o \
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pngwtran.o pngmem.o pngerror.o pngpread.o
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all: libpng.a pngtest
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libpng.a: $(OBJS)
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ar rc $@ $(OBJS)
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$(RANLIB) $@
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pngtest: pngtest.o libpng.a
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$(CC) -o pngtest $(CCFLAGS) pngtest.o $(LDFLAGS)
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test: pngtest
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./pngtest
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install: libpng.a
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-@mkdir $(prefix)/include
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-@mkdir $(prefix)/lib
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cp png.h $(prefix)/include
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cp pngconf.h $(prefix)/include
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chmod 644 $(prefix)/include/png.h
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chmod 644 $(prefix)/include/pngconf.h
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cp libpng.a $(prefix)/lib
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chmod 644 $(prefix)/lib/libpng.a
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clean:
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rm -f *.o libpng.a pngtest pngout.png
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# DO NOT DELETE THIS LINE -- make depend depends on it.
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png.o: png.h pngconf.h
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pngerror.o: png.h pngconf.h
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pngrio.o: png.h pngconf.h
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pngwio.o: png.h pngconf.h
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pngmem.o: png.h pngconf.h
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pngset.o: png.h pngconf.h
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pngget.o: png.h pngconf.h
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pngread.o: png.h pngconf.h
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pngrtran.o: png.h pngconf.h
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pngrutil.o: png.h pngconf.h
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pngtest.o: png.h pngconf.h
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pngtrans.o: png.h pngconf.h
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pngwrite.o: png.h pngconf.h
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pngwtran.o: png.h pngconf.h
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pngwutil.o: png.h pngconf.h
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pngpread.o: png.h pngconf.h
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65
makefile.elf
65
makefile.elf
@ -1,5 +1,6 @@
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# makefile for libpng on (linux) ELF
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# makefile for libpng on Linux ELF with gcc
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# Copyright (C) 1996, 1997 Andreas Dilger
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# Copyright (C) 1998 Glenn Randers-Pehrson
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# For conditions of distribution and use, see copyright notice in png.h
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CC=gcc
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@ -13,14 +14,15 @@ ZLIBINC=../zlib
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WARNMORE=-Wwrite-strings -Wpointer-arith -Wshadow \
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-Wmissing-declarations -Wtraditional -Wcast-align \
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-Wstrict-prototypes -Wmissing-prototypes #-Wconversion
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CFLAGS=-I$(ZLIBINC) -Wall -O3 -funroll-loops -malign-loops=2 -malign-functions=2 -fPIC #$(WARNMORE) -g -DPNG_DEBUG=5
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CFLAGS=-I$(ZLIBINC) -Wall -O3 -funroll-loops -malign-loops=2 \
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-malign-functions=2 #$(WARNMORE) -g -DPNG_DEBUG=5
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LDFLAGS=-L. -Wl,-rpath,. -L$(ZLIBLIB) -Wl,-rpath,$(ZLIBLIB) -lpng -lz -lm
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RANLIB=ranlib
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#RANLIB=echo
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PNGMAJ = 1
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PNGMIN = 1.0
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PNGMAJ = 2
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PNGMIN = 0.97
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PNGVER = $(PNGMAJ).$(PNGMIN)
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# where make install puts libpng.a, libpng.so*, and png.h
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@ -32,7 +34,14 @@ OBJS = png.o pngset.o pngget.o pngrutil.o pngtrans.o pngwutil.o \
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pngread.o pngrio.o pngwio.o pngwrite.o pngrtran.o \
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pngwtran.o pngmem.o pngerror.o pngpread.o
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all: libpng.so pngtest
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OBJSDLL = $(OBJS:.o=.pic.o)
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.SUFFIXES: .c .o .pic.o
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.c.pic.o:
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$(CC) -c $(CFLAGS) -fPIC -o $@ $*.c
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all: libpng.a libpng.so pngtest
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libpng.a: $(OBJS)
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ar rc $@ $(OBJS)
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@ -44,43 +53,45 @@ libpng.so: libpng.so.$(PNGMAJ)
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libpng.so.$(PNGMAJ): libpng.so.$(PNGVER)
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ln -sf libpng.so.$(PNGVER) libpng.so.$(PNGMAJ)
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libpng.so.$(PNGVER): $(OBJS)
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gcc -shared -Wl,-soname,libpng.so.$(PNGMAJ) $(OBJS) -o libpng.so.$(PNGVER)
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libpng.so.$(PNGVER): $(OBJSDLL)
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gcc -shared -Wl,-soname,libpng.so.$(PNGMAJ) -o libpng.so.$(PNGVER) \
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$(OBJSDLL)
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pngtest: pngtest.o libpng.so
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$(CC) -o pngtest $(CCFLAGS) pngtest.o $(LDFLAGS)
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$(CC) -o pngtest $(CFLAGS) pngtest.o $(LDFLAGS)
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test: pngtest
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./pngtest
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install: libpng.so.$(PNGVER)
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install: libpng.a libpng.so.$(PNGVER)
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-@mkdir $(INCPATH) $(LIBPATH)
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cp png.h pngconf.h $(INCPATH)
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chmod 644 $(INCPATH)/png.h $(INCPATH)/pngconf.h
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cp libpng.so.$(PNGVER) $(LIBPATH)
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cp libpng.a libpng.so.$(PNGVER) $(LIBPATH)
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chmod 755 $(LIBPATH)/libpng.so.$(PNGVER)
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-@/bin/rm $(LIBPATH)/libpng.so.$(PNGMAJ) $(LIBPATH)/libpng.so
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-@/bin/rm -f $(LIBPATH)/libpng.so.$(PNGMAJ) $(LIBPATH)/libpng.so
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(cd $(LIBPATH); ln -sf libpng.so.$(PNGVER) libpng.so.$(PNGMAJ); \
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ln -sf libpng.so.$(PNGMAJ) libpng.so)
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clean:
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rm -f *.o libpng.a libpng.so* pngtest pngout.png
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/bin/rm -f *.o libpng.a libpng.so* pngtest pngout.png
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# DO NOT DELETE THIS LINE -- make depend depends on it.
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png.o: png.h pngconf.h
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pngerror.o: png.h pngconf.h
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pngrio.o: png.h pngconf.h
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pngwio.o: png.h pngconf.h
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pngmem.o: png.h pngconf.h
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pngset.o: png.h pngconf.h
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pngget.o: png.h pngconf.h
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pngread.o: png.h pngconf.h
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pngrtran.o: png.h pngconf.h
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pngrutil.o: png.h pngconf.h
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png.o png.pic.o: png.h pngconf.h
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pngerror.o pngerror.pic.o: png.h pngconf.h
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pngrio.o pngrio.pic.o: png.h pngconf.h
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pngwio.o pngwio.pic.o: png.h pngconf.h
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pngmem.o pngmem.pic.o: png.h pngconf.h
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pngset.o pngset.pic.o: png.h pngconf.h
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pngget.o pngget.pic.o: png.h pngconf.h
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pngread.o pngread.pic.o: png.h pngconf.h
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pngrtran.o pngrtran.pic.o: png.h pngconf.h
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pngrutil.o pngrutil.pic.o: png.h pngconf.h
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pngtrans.o pngtrans.pic.o: png.h pngconf.h
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pngwrite.o pngwrite.pic.o: png.h pngconf.h
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pngwtran.o pngwtran.pic.o: png.h pngconf.h
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pngwutil.o pngwutil.pic.o: png.h pngconf.h
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pngpread.o pngpread.pic.o: png.h pngconf.h
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pngtest.o: png.h pngconf.h
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pngtrans.o: png.h pngconf.h
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pngwrite.o: png.h pngconf.h
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pngwtran.o: png.h pngconf.h
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pngwutil.o: png.h pngconf.h
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pngpread.o: png.h pngconf.h
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7
png.c
7
png.c
@ -1,11 +1,12 @@
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/* png.c - location for general purpose libpng functions
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*
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* libpng 1.00.97
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* libpng 0.97
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* For conditions of distribution and use, see copyright notice in png.h
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* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
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* Copyright (c) 1996, 1997 Andreas Dilger
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* May 28, 1997
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* Copyright (c) 1998, Glenn Randers-Pehrson
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* January 7, 1998
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*/
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#define PNG_INTERNAL
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@ -15,7 +16,7 @@
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/* Version information for C files. This had better match the version
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* string defined in png.h.
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*/
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char png_libpng_ver[] = "1.00.97";
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char png_libpng_ver[] = "0.97";
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/* Place to hold the signiture string for a PNG file. */
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png_byte FARDATA png_sig[8] = {137, 80, 78, 71, 13, 10, 26, 10};
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34
png.h
34
png.h
@ -1,11 +1,12 @@
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/* png.h - header file for PNG reference library
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*
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* libpng 1.00.97 beta 7
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* libpng 0.97 beta
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* For conditions of distribution and use, see copyright notice in png.h
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* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
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* Copyright (c) 1996, 1997 Andreas Dilger
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* Dec 31, 1997
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* Copyright (c) 1998 Glenn Randers-Pehrson
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* January 7, 1998
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*
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* BETA NOTICE:
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* This is a beta version. It reads and writes valid files on the
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@ -93,7 +94,7 @@ extern "C" {
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*/
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/* Version information for png.h - this should match the version in png.c */
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#define PNG_LIBPNG_VER_STRING "1.00.97"
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#define PNG_LIBPNG_VER_STRING "0.97"
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/* careful here. At one time, I wanted to use 082, but that would be octal.
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* Version 1.0 will be 100 here, etc.
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@ -107,6 +108,33 @@ extern "C" {
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*/
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extern char png_libpng_ver[];
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/*
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* Note about libpng version numbers:
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*
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* Due to various miscommunications, unforeseen code incompatibilities
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* and occasional factors outside the authors' control, version numbering
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* on the library has not always been consistent and straightforward.
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* The following table summarizes matters since version 0.89c, which was
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* the first widely used release:
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*
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* source png.h shared-lib
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* version string version
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* ------- ------ ----------
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* 0.89c ("1.0 beta 3") 0.89 1.0.89
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* 0.90 ("1.0 beta 4") 0.90 0.90 [should have been 2.0.90]
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* 0.95 ("1.0 beta 5") 0.95 0.95 [should have been 2.0.95]
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* 0.96 ("1.0 beta 6") 0.96 0.96 [should have been 2.0.96]
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* 0.97b ("1.00.97 beta 7") 1.00.97 1.0.0 [should have been 2.0.97]
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* 0.97c 0.97 2.0.97
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* 0.98 0.98 2.0.98
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* 0.99 0.99 2.0.99
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* 1.0 1.00 2.1.0
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*
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* Henceforth the source version will match the shared-library minor
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* and patch numbers; the shared-library major version number will be
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* used for changes in backward compatibility, as it is intended.
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*/
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/* Structures to facilitate easy interlacing. See png.c for more details */
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extern int FARDATA png_pass_start[];
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extern int FARDATA png_pass_inc[];
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@ -1,11 +1,12 @@
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/* pngconf.c - machine configurable file for libpng
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*
|
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* libpng 1.00.97
|
||||
* libpng 0.97
|
||||
* For conditions of distribution and use, see copyright notice in png.h
|
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* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
|
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* Copyright (c) 1996, 1997 Andreas Dilger
|
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* May 28, 1997
|
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* Copyright (c) 1998, Glenn Randers-Pehrson
|
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* January 7, 1998
|
||||
*/
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||||
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||||
/* Any machine specific code is near the front of this file, so if you
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@ -259,6 +260,7 @@ __dont__ include it again
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#define PNG_READ_GRAY_TO_RGB_SUPPORTED
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#define PNG_READ_SWAP_ALPHA_SUPPORTED
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#define PNG_READ_STRIP_ALPHA_SUPPORTED
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#define PNG_READ_COMPOSITE_NODIV_SUPPORTED /* well tested on Intel */
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#endif /* PNG_READ_FULLY_SUPPORTED */
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#define PNG_READ_INTERLACING_SUPPORTED
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@ -274,7 +276,7 @@ __dont__ include it again
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#define PNG_WRITE_FLUSH_SUPPORTED
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#define PNG_WRITE_SWAP_ALPHA_SUPPORTED
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#define PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
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#endif /*PNG_WRITE_FULLY_SUPPORTED */
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#endif /* PNG_WRITE_FULLY_SUPPORTED */
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#if !defined(PNG_NO_STDIO)
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#define PNG_TIME_RFC1152_SUPPORTED
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@ -282,7 +284,6 @@ __dont__ include it again
|
||||
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||||
/* These are currently experimental features */
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#undef PNG_READ_16_TO_8_ACCURATE_SHIFT_SUPPORTED /* very little testing */
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#undef PNG_READ_COMPOSITE_NODIV_SUPPORTED /* very little testing */
|
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||||
/* This is only for PowerPC big-endian and 680x0 systems */
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||||
#undef PNG_READ_BIG_ENDIAN_SUPPORTED /* some testing */
|
||||
|
||||
@ -1,11 +1,12 @@
|
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|
||||
/* pngerror.c - stub functions for i/o and memory allocation
|
||||
*
|
||||
* libpng 1.00.97
|
||||
* libpng 0.97
|
||||
* For conditions of distribution and use, see copyright notice in png.h
|
||||
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
|
||||
* Copyright (c) 1996, 1997 Andreas Dilger
|
||||
* May 28, 1997
|
||||
* Copyright (c) 1998, Glenn Randers-Pehrson
|
||||
* January 7, 1998
|
||||
*
|
||||
* This file provides a location for all error handling. Users which
|
||||
* need special error handling are expected to write replacement functions
|
||||
@ -84,7 +85,7 @@ png_format_buffer(png_structp png_ptr, png_charp buffer, png_const_charp message
|
||||
else {
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||||
buffer[iout++] = ':';
|
||||
buffer[iout++] = ' ';
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strncpy(buffer+iout, message, 64);
|
||||
png_memcpy(buffer+iout, message, 64);
|
||||
buffer[iout+63] = 0;
|
||||
}
|
||||
}
|
||||
|
||||
5
pngget.c
5
pngget.c
@ -1,11 +1,12 @@
|
||||
|
||||
/* pngget.c - retrieval of values from info struct
|
||||
*
|
||||
* libpng 1.00.97
|
||||
* libpng 0.97
|
||||
* For conditions of distribution and use, see copyright notice in png.h
|
||||
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
|
||||
* Copyright (c) 1996, 1997 Andreas Dilger
|
||||
* May 28, 1997
|
||||
* Copyright (c) 1998, Glenn Randers-Pehrson
|
||||
* January 7, 1998
|
||||
*/
|
||||
|
||||
#define PNG_INTERNAL
|
||||
|
||||
5
pngmem.c
5
pngmem.c
@ -1,11 +1,12 @@
|
||||
|
||||
/* pngmem.c - stub functions for memory allocation
|
||||
*
|
||||
* libpng 1.00.97
|
||||
* libpng 0.97
|
||||
* For conditions of distribution and use, see copyright notice in png.h
|
||||
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
|
||||
* Copyright (c) 1996, 1997 Andreas Dilger
|
||||
* May 28, 1997
|
||||
* Copyright (c) 1998, Glenn Randers-Pehrson
|
||||
* January 7, 1998
|
||||
*
|
||||
* This file provides a location for all memory allocation. Users which
|
||||
* need special memory handling are expected to modify the code in this file
|
||||
|
||||
@ -1,11 +1,12 @@
|
||||
|
||||
/* pngpread.c - read a png file in push mode
|
||||
*
|
||||
* libpng 1.00.97
|
||||
* libpng 0.97
|
||||
* For conditions of distribution and use, see copyright notice in png.h
|
||||
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
|
||||
* Copyright (c) 1996, 1997 Andreas Dilger
|
||||
* May 28, 1997
|
||||
* Copyright (c) 1998, Glenn Randers-Pehrson
|
||||
* January 7, 1998
|
||||
*/
|
||||
|
||||
#define PNG_INTERNAL
|
||||
|
||||
@ -1,11 +1,12 @@
|
||||
|
||||
/* pngread.c - read a PNG file
|
||||
*
|
||||
* libpng 1.00.97
|
||||
* libpng 0.97
|
||||
* For conditions of distribution and use, see copyright notice in png.h
|
||||
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
|
||||
* Copyright (c) 1996, 1997 Andreas Dilger
|
||||
* May 28, 1997
|
||||
* Copyright (c) 1998, Glenn Randers-Pehrson
|
||||
* January 7, 1998
|
||||
*
|
||||
* This file contains routines that an application calls directly to
|
||||
* read a PNG file or stream.
|
||||
|
||||
5
pngrio.c
5
pngrio.c
@ -1,11 +1,12 @@
|
||||
|
||||
/* pngrio.c - functions for data input
|
||||
*
|
||||
* libpng 1.00.97
|
||||
* libpng 0.97
|
||||
* For conditions of distribution and use, see copyright notice in png.h
|
||||
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
|
||||
* Copyright (c) 1996, 1997 Andreas Dilger
|
||||
* May 28, 1997
|
||||
* Copyright (c) 1998, Glenn Randers-Pehrson
|
||||
* January 7, 1998
|
||||
*
|
||||
* This file provides a location for all input. Users which need
|
||||
* special handling are expected to write a function which has the same
|
||||
|
||||
84
pngrtran.c
84
pngrtran.c
@ -1,11 +1,12 @@
|
||||
|
||||
/* pngrtran.c - transforms the data in a row for PNG readers
|
||||
*
|
||||
* libpng 1.00.97
|
||||
* libpng 0.97
|
||||
* For conditions of distribution and use, see copyright notice in png.h
|
||||
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
|
||||
* Copyright (c) 1996, 1997 Andreas Dilger
|
||||
* May 28, 1997
|
||||
* Copyright (c) 1998, Glenn Randers-Pehrson
|
||||
* January 7, 1998
|
||||
*
|
||||
* This file contains functions optionally called by an application
|
||||
* in order to tell libpng how to handle data when reading a PNG.
|
||||
@ -21,35 +22,40 @@
|
||||
* many machines. However, it does take more operations than the corresponding
|
||||
* divide method, so it may be slower on some RISC systems. There are two
|
||||
* shifts (by 8 or 16 bits) and an addition, versus a single integer divide.
|
||||
* The results may also be off by one for certain values.
|
||||
*
|
||||
* Note that the rounding factors are NOT supposed to be the same! 128 and
|
||||
* 32768 are correct for the NODIV code; 127 and 32767 are correct for the
|
||||
* standard method.
|
||||
*
|
||||
* [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ]
|
||||
*/
|
||||
|
||||
/* pixel and background should be in gamma 1.0 space */
|
||||
#define png_composite(composite, pixel, trans, background) \
|
||||
{ png_uint_16 temp = ((png_uint_16)(pixel) * (png_uint_16)(trans) + \
|
||||
(png_uint_16)(background)*(png_uint_16)(255 - \
|
||||
(png_uint_16)(trans)) + (png_uint_16)127); \
|
||||
(composite) = (png_byte)(((temp >> 8) + temp) >> 8); }
|
||||
/* fg and bg should be in `gamma 1.0' space; alpha is the opacity */
|
||||
# define png_composite(composite, fg, alpha, bg) \
|
||||
{ png_uint_16 temp = ((png_uint_16)(fg) * (png_uint_16)(alpha) + \
|
||||
(png_uint_16)(bg)*(png_uint_16)(255 - \
|
||||
(png_uint_16)(alpha)) + (png_uint_16)128); \
|
||||
(composite) = (png_byte)((temp + (temp >> 8)) >> 8); }
|
||||
# define png_composite_16(composite, fg, alpha, bg) \
|
||||
{ png_uint_32 temp = ((png_uint_32)(fg) * (png_uint_32)(alpha) + \
|
||||
(png_uint_32)(bg)*(png_uint_32)(65535L - \
|
||||
(png_uint_32)(alpha)) + (png_uint_32)32768L); \
|
||||
(composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); }
|
||||
|
||||
/* pixel and background should be in gamma 1.0 space */
|
||||
#define png_composite_16(composite, pixel, trans, background) \
|
||||
{ png_uint_32 temp = ((png_uint_32)(pixel) * (png_uint_32)(trans) + \
|
||||
(png_uint_32)(background)*(png_uint_32)(65535L - \
|
||||
(png_uint_32)(trans)) + (png_uint_32)32767); \
|
||||
(composite) = (png_uint_16)(((temp >> 16) + temp) >> 16); }
|
||||
#else
|
||||
/* pixel and background should be in gamma 1.0 space */
|
||||
#define png_composite(composite, pixel, trans, background) \
|
||||
(composite) = (png_byte)(((png_uint_16)(pixel) * (png_uint_16)(trans) + \
|
||||
(png_uint_16)(background) * (png_uint_16)(255 - (png_uint_16)(trans)) + \
|
||||
#else /* standard method using integer division */
|
||||
|
||||
/* fg and bg should be in `gamma 1.0' space; alpha is the opacity */
|
||||
# define png_composite(composite, fg, alpha, bg) \
|
||||
(composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) + \
|
||||
(png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) + \
|
||||
(png_uint_16)127) / 255)
|
||||
|
||||
/* pixel and background should be in gamma 1.0 space */
|
||||
#define png_composite_16(composite, pixel, trans, background) \
|
||||
(composite) = (png_uint_16)(((png_uint_32)(pixel) * (png_uint_32)(trans) + \
|
||||
(png_uint_32)(background)*(png_uint_32)(65535L - (png_uint_32)(trans)) + \
|
||||
# define png_composite_16(composite, fg, alpha, bg) \
|
||||
(composite) = (png_uint_16)(((png_uint_32)(fg) * (png_uint_32)(alpha) + \
|
||||
(png_uint_32)(bg)*(png_uint_32)(65535L - (png_uint_32)(alpha)) + \
|
||||
(png_uint_32)32767) / (png_uint_32)65535L)
|
||||
#endif
|
||||
|
||||
#endif /* ?PNG_READ_COMPOSITE_NODIV_SUPPORTED */
|
||||
|
||||
|
||||
/* Set the action on getting a CRC error for an ancillary or critical chunk. */
|
||||
void
|
||||
@ -1344,6 +1350,16 @@ png_do_chop(png_row_infop row_info, png_bytep row)
|
||||
*dp = (((((png_uint_32)(*sp) << 8) |
|
||||
(png_uint_32)(*(sp + 1))) * 255 + 127) / (png_uint_32)65535L;
|
||||
|
||||
|
||||
* GRR: no, I think this is what it really should be:
|
||||
*dp = (((((png_uint_32)(*sp) << 8) |
|
||||
(png_uint_32)(*(sp + 1))) + 128L) / (png_uint_32)257L;
|
||||
|
||||
* GRR: here's the exact calculation with shifts:
|
||||
temp = (((png_uint_32)(*sp) << 8) | (png_uint_32)(*(sp + 1))) + 128L;
|
||||
*dp = (temp - (temp >> 8)) >> 8;
|
||||
|
||||
|
||||
* Approximate calculation with shift/add instead of multiply/divide:
|
||||
*dp = ((((png_uint_32)(*sp) << 8) |
|
||||
(png_uint_32)((int)(*(sp + 1)) - *sp)) + 128) >> 8;
|
||||
@ -2558,6 +2574,22 @@ png_do_gamma(png_row_infop row_info, png_bytep row,
|
||||
}
|
||||
case PNG_COLOR_TYPE_GRAY:
|
||||
{
|
||||
if (row_info->bit_depth == 2)
|
||||
{
|
||||
for (i = 0, sp = row; i < row_info->width; i += 4)
|
||||
{
|
||||
int a = *sp & 0xc0;
|
||||
int b = *sp & 0x30;
|
||||
int c = *sp & 0x0c;
|
||||
int d = *sp & 0x03;
|
||||
|
||||
*sp = ((((int)gamma_table[a|(a>>2)|(a>>4)|(a>>6)]) ) & 0xc0)|
|
||||
((((int)gamma_table[(b<<2)|b|(b>>2)|(b>>4)])>>2) & 0x30)|
|
||||
((((int)gamma_table[(c<<4)|(c<<2)|c|(c>>2)])>>4) & 0x0c)|
|
||||
((((int)gamma_table[(d<<6)|(d<<4)|(d<<2)|d])>>6) );
|
||||
sp++;
|
||||
}
|
||||
}
|
||||
if (row_info->bit_depth == 4)
|
||||
{
|
||||
for (i = 0, sp = row; i < row_info->width; i += 2)
|
||||
|
||||
101
pngrutil.c
101
pngrutil.c
@ -1,11 +1,12 @@
|
||||
|
||||
/* pngrutil.c - utilities to read a PNG file
|
||||
*
|
||||
* libpng 1.00.97
|
||||
* libpng 0.97
|
||||
* For conditions of distribution and use, see copyright notice in png.h
|
||||
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
|
||||
* Copyright (c) 1996, 1997 Andreas Dilger
|
||||
* May 28, 1997
|
||||
* Copyright (c) 1998, Glenn Randers-Pehrson
|
||||
* January 7, 1998
|
||||
*
|
||||
* This file contains routines which are only called from within
|
||||
* libpng itself during the course of reading an image.
|
||||
@ -373,7 +374,12 @@ png_handle_gAMA(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
|
||||
else if (png_ptr->mode & PNG_HAVE_PLTE)
|
||||
/* Should be an error, but we can cope with it */
|
||||
png_warning(png_ptr, "Out of place gAMA chunk");
|
||||
else if (info_ptr != NULL && info_ptr->valid & PNG_INFO_gAMA)
|
||||
|
||||
else if (info_ptr != NULL && info_ptr->valid & PNG_INFO_gAMA
|
||||
#if defined(PNG_READ_sRGB_SUPPORTED)
|
||||
&& !(info_ptr->valid & PNG_INFO_sRGB)
|
||||
#endif
|
||||
)
|
||||
{
|
||||
png_warning(png_ptr, "Duplicate gAMA chunk");
|
||||
png_crc_finish(png_ptr, length);
|
||||
@ -397,21 +403,14 @@ png_handle_gAMA(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
|
||||
return;
|
||||
|
||||
#if defined(PNG_READ_sRGB_SUPPORTED)
|
||||
if ((png_ptr->mode & PNG_HAVE_sRGB))
|
||||
if(igamma != (png_uint_32)50000L)
|
||||
{
|
||||
png_warning(png_ptr,
|
||||
"Ignoring incorrect gAMA value when sRGB is also present");
|
||||
return;
|
||||
}
|
||||
#endif /* PNG_READ_sRGB_SUPPORTED */
|
||||
|
||||
#if defined(PNG_READ_sRGB_SUPPORTED)
|
||||
if (png_ptr->mode & PNG_HAVE_sRGB)
|
||||
if(igamma != (png_uint_32)50000L)
|
||||
if (info_ptr->valid & PNG_INFO_sRGB)
|
||||
if(igamma != (png_uint_32)45000L)
|
||||
{
|
||||
png_warning(png_ptr,
|
||||
"Ignoring incorrect gAMA value when sRGB is also present");
|
||||
#ifndef PNG_NO_STDIO
|
||||
fprintf(stderr, "igamma = %lu\n", igamma);
|
||||
#endif
|
||||
return;
|
||||
}
|
||||
#endif /* PNG_READ_sRGB_SUPPORTED */
|
||||
@ -506,8 +505,12 @@ png_handle_cHRM(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
|
||||
else if (png_ptr->mode & PNG_HAVE_PLTE)
|
||||
/* Should be an error, but we can cope with it */
|
||||
png_warning(png_ptr, "Missing PLTE before cHRM");
|
||||
|
||||
else if (info_ptr != NULL && info_ptr->valid & PNG_INFO_cHRM
|
||||
&& !(info_ptr->valid & PNG_INFO_sRGB))
|
||||
#if defined(PNG_READ_sRGB_SUPPORTED)
|
||||
&& !(info_ptr->valid & PNG_INFO_sRGB)
|
||||
#endif
|
||||
)
|
||||
{
|
||||
png_warning(png_ptr, "Duplicate cHRM chunk");
|
||||
png_crc_finish(png_ptr, length);
|
||||
@ -589,7 +592,7 @@ png_handle_cHRM(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
|
||||
return;
|
||||
|
||||
#if defined(PNG_READ_sRGB_SUPPORTED)
|
||||
if (png_ptr->mode & PNG_HAVE_sRGB)
|
||||
if (info_ptr->valid & PNG_INFO_sRGB)
|
||||
{
|
||||
if (fabs(white_x - (float).3127) > (float).001 ||
|
||||
fabs(white_y - (float).3290) > (float).001 ||
|
||||
@ -598,10 +601,17 @@ png_handle_cHRM(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
|
||||
fabs(green_x - (float).3000) > (float).001 ||
|
||||
fabs(green_y - (float).6000) > (float).001 ||
|
||||
fabs( blue_x - (float).1500) > (float).001 ||
|
||||
fabs( blue_y - (float).6000) > (float).001)
|
||||
fabs( blue_y - (float).0600) > (float).001)
|
||||
{
|
||||
|
||||
png_warning(png_ptr,
|
||||
"Ignoring incorrect cHRM value when sRGB is also present");
|
||||
#ifndef PNG_NO_STDIO
|
||||
fprintf(stderr,"wx=%f, wy=%f, rx=%f, ry=%f\n",
|
||||
white_x, white_y, red_x, red_y);
|
||||
fprintf(stderr,"gx=%f, gy=%f, bx=%f, by=%f\n",
|
||||
green_x, green_y, blue_x, blue_y);
|
||||
#endif
|
||||
}
|
||||
return;
|
||||
}
|
||||
@ -618,8 +628,6 @@ png_handle_sRGB(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
|
||||
{
|
||||
png_byte intent;
|
||||
png_byte buf[1];
|
||||
float file_gamma;
|
||||
float white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y;
|
||||
|
||||
png_debug(1, "in png_handle_sRGB\n");
|
||||
|
||||
@ -634,6 +642,7 @@ png_handle_sRGB(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
|
||||
else if (png_ptr->mode & PNG_HAVE_PLTE)
|
||||
/* Should be an error, but we can cope with it */
|
||||
png_warning(png_ptr, "Out of place sRGB chunk");
|
||||
|
||||
else if (info_ptr != NULL && info_ptr->valid & PNG_INFO_sRGB)
|
||||
{
|
||||
png_warning(png_ptr, "Duplicate sRGB chunk");
|
||||
@ -660,28 +669,38 @@ png_handle_sRGB(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
|
||||
return;
|
||||
}
|
||||
|
||||
/* if we really want to be paranoid we could check for
|
||||
already defined gamma and chrm with values that are
|
||||
inconsistent with sRGB -- for now, just ignore them */
|
||||
|
||||
file_gamma = (float)45000./(float)100000.;
|
||||
png_set_gAMA(png_ptr, info_ptr, file_gamma);
|
||||
|
||||
white_x = (float)31270./(float)100000.;
|
||||
white_y = (float)32900./(float)100000.;
|
||||
red_x = (float)64000./(float)100000.;
|
||||
red_y = (float)33000./(float)100000.;
|
||||
green_x = (float)30000./(float)100000.;
|
||||
green_y = (float)60000./(float)100000.;
|
||||
blue_x = (float)15000./(float)100000.;
|
||||
blue_y = (float) 6000./(float)100000.;
|
||||
|
||||
png_set_cHRM(png_ptr, info_ptr,
|
||||
white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y);
|
||||
|
||||
png_set_sRGB(png_ptr, info_ptr, intent);
|
||||
}
|
||||
#ifdef PNG_READ_gAMA_SUPPORTED
|
||||
if ((info_ptr->valid & PNG_INFO_gAMA))
|
||||
if((png_uint_32)(png_ptr->gamma*(float)100000.+.5) != (png_uint_32)45000L)
|
||||
{
|
||||
png_warning(png_ptr,
|
||||
"Ignoring incorrect gAMA value when sRGB is also present");
|
||||
#ifndef PNG_NO_STDIO
|
||||
fprintf(stderr,"gamma=%f\n",png_ptr->gamma);
|
||||
#endif
|
||||
}
|
||||
#endif /* PNG_READ_gAMA_SUPPORTED */
|
||||
|
||||
#ifdef PNG_READ_cHRM_SUPPORTED
|
||||
if (info_ptr->valid & PNG_INFO_cHRM)
|
||||
if (fabs(info_ptr->x_white - (float).3127) > (float).001 ||
|
||||
fabs(info_ptr->y_white - (float).3290) > (float).001 ||
|
||||
fabs( info_ptr->x_red - (float).6400) > (float).001 ||
|
||||
fabs( info_ptr->y_red - (float).3300) > (float).001 ||
|
||||
fabs(info_ptr->x_green - (float).3000) > (float).001 ||
|
||||
fabs(info_ptr->y_green - (float).6000) > (float).001 ||
|
||||
fabs( info_ptr->x_blue - (float).1500) > (float).001 ||
|
||||
fabs( info_ptr->y_blue - (float).0600) > (float).001)
|
||||
{
|
||||
png_warning(png_ptr,
|
||||
"Ignoring incorrect cHRM value when sRGB is also present");
|
||||
}
|
||||
#endif /* PNG_READ_cHRM_SUPPORTED */
|
||||
|
||||
png_set_sRGB_gAMA_and_cHRM(png_ptr, info_ptr, intent);
|
||||
}
|
||||
#endif /* PNG_READ_sRGB_SUPPORTED */
|
||||
|
||||
#if defined(PNG_READ_tRNS_SUPPORTED)
|
||||
void
|
||||
png_handle_tRNS(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
|
||||
|
||||
5
pngset.c
5
pngset.c
@ -1,11 +1,12 @@
|
||||
|
||||
/* pngset.c - storage of image information into info struct
|
||||
*
|
||||
* libpng 1.00.97
|
||||
* libpng 0.97
|
||||
* For conditions of distribution and use, see copyright notice in png.h
|
||||
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
|
||||
* Copyright (c) 1996, 1997 Andreas Dilger
|
||||
* May 28, 1997
|
||||
* Copyright (c) 1998, Glenn Randers-Pehrson
|
||||
* January 7, 1998
|
||||
*
|
||||
* The functions here are used during reads to store data from the file
|
||||
* into the info struct, and during writes to store application data
|
||||
|
||||
@ -1,11 +1,12 @@
|
||||
|
||||
/* pngtest.c - a simple test program to test libpng
|
||||
*
|
||||
* libpng 1.00.97
|
||||
* libpng 0.97
|
||||
* For conditions of distribution and use, see copyright notice in png.h
|
||||
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
|
||||
* Copyright (c) 1996, 1997 Andreas Dilger
|
||||
* May 28, 1997
|
||||
* Copyright (c) 1998, Glenn Randers-Pehrson
|
||||
* January 7, 1998
|
||||
*
|
||||
* This program reads in a PNG image, writes it out again, and then
|
||||
* compares the two files. If the files are identical, this shows that
|
||||
@ -620,8 +621,11 @@ main(int argc, char *argv[])
|
||||
{
|
||||
int i;
|
||||
for (i=2; i<argc; ++i)
|
||||
{
|
||||
fprintf(STDERR, "Testing %s:\n",argv[i]);
|
||||
ierror += test(argv[i], outname);
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
ierror += test(inname, outname);
|
||||
|
||||
@ -1,11 +1,12 @@
|
||||
|
||||
/* pngtrans.c - transforms the data in a row (used by both readers and writers)
|
||||
*
|
||||
* libpng 1.00.97
|
||||
* libpng 0.97
|
||||
* For conditions of distribution and use, see copyright notice in png.h
|
||||
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
|
||||
* Copyright (c) 1996, 1997 Andreas Dilger
|
||||
* May 28, 1997
|
||||
* Copyright (c) 1998, Glenn Randers-Pehrson
|
||||
* January 7, 1998
|
||||
*/
|
||||
|
||||
#define PNG_INTERNAL
|
||||
|
||||
5
pngwio.c
5
pngwio.c
@ -1,11 +1,12 @@
|
||||
|
||||
/* pngwio.c - functions for data output
|
||||
*
|
||||
* libpng 1.00.97
|
||||
* libpng 0.97
|
||||
* For conditions of distribution and use, see copyright notice in png.h
|
||||
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
|
||||
* Copyright (c) 1996, 1997 Andreas Dilger
|
||||
* May 28, 1997
|
||||
* Copyright (c) 1998, Glenn Randers-Pehrson
|
||||
* January 7, 1998
|
||||
*
|
||||
* This file provides a location for all output. Users which need
|
||||
* special handling are expected to write functions which have the same
|
||||
|
||||
@ -1,11 +1,12 @@
|
||||
|
||||
/* pngwrite.c - general routines to write a PNG file
|
||||
*
|
||||
* libpng 1.00.97
|
||||
* libpng 0.97
|
||||
* For conditions of distribution and use, see copyright notice in png.h
|
||||
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
|
||||
* Copyright (c) 1996, 1997 Andreas Dilger
|
||||
* May 28, 1997
|
||||
* Copyright (c) 1998, Glenn Randers-Pehrson
|
||||
* January 7, 1998
|
||||
*/
|
||||
|
||||
/* get internal access to png.h */
|
||||
|
||||
@ -1,11 +1,12 @@
|
||||
|
||||
/* pngwtran.c - transforms the data in a row for PNG writers
|
||||
*
|
||||
* libpng 1.00.97
|
||||
* libpng 0.97
|
||||
* For conditions of distribution and use, see copyright notice in png.h
|
||||
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
|
||||
* Copyright (c) 1996, 1997 Andreas Dilger
|
||||
* May 28, 1997
|
||||
* Copyright (c) 1998, Glenn Randers-Pehrson
|
||||
* January 7, 1998
|
||||
*/
|
||||
|
||||
#define PNG_INTERNAL
|
||||
|
||||
@ -1,11 +1,12 @@
|
||||
|
||||
/* pngwutil.c - utilities to write a PNG file
|
||||
*
|
||||
* libpng 1.00.97
|
||||
* libpng 0.97
|
||||
* For conditions of distribution and use, see copyright notice in png.h
|
||||
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
|
||||
* Copyright (c) 1996, 1997 Andreas Dilger
|
||||
* May 28, 1997
|
||||
* Copyright (c) 1998, Glenn Randers-Pehrson
|
||||
* January 7, 1998
|
||||
*/
|
||||
|
||||
#define PNG_INTERNAL
|
||||
|
||||
Reference in New Issue
Block a user