mirror of
https://git.code.sf.net/p/libpng/code.git
synced 2025-07-10 18:04:09 +02:00
[devel] Revised contrib/pngminim to use the "everything off" option
in pngusr.dfa.
This commit is contained in:
Glenn Randers-Pehrson
@@ -1,9 +1,10 @@
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This demonstrates the use of PNG_USER_CONFIG and pngusr.h
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To build a minimal write-only decoder with embedded libpng and zlib, run
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The makefile builds a minimal write-only decoder with embedded libpng
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and zlib.
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Specify the location of the zlib source (1.2.1 or later) as ZLIBSRC
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on the make command line.
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gather.sh # to collect needed files from pngminus, libpng, and zlib
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make
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If you prefer to use the shared libraries, go to contrib/pngminus
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and build the pnm2png application there.
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@@ -1,27 +1,5 @@
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#include "zlib.h"
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int ZEXPORT inflate(strm, flush)
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z_streamp strm;
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int flush;
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{ return Z_OK ; }
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int ZEXPORT inflateReset(strm)
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z_streamp strm;
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{ return Z_OK ; }
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int ZEXPORT inflateEnd(strm)
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z_streamp strm;
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{ return Z_STREAM_ERROR ; }
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int ZEXPORT inflateInit_(strm, version, stream_size)
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z_streamp strm;
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const char *version;
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int stream_size;
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{ return Z_OK ; }
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int ZEXPORT inflateInit2_(strm, windowBits, version, stream_size)
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z_streamp strm;
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int windowBits;
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const char *version;
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int stream_size;
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{ return Z_STREAM_ERROR ; }
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@@ -1,17 +0,0 @@
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test -n "${PNGSRC}" || PNGSRC=../../..
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cp ${PNGSRC}/contrib/pngminus/pnm2png.c pnm2pngm.c
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cp "${PNGSRC}"/*.h .
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cp "${PNGSRC}"/*.c .
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rm example.c pngtest.c pngr*.c pngpread.c
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rm -f pnglibconf.h
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test -d scripts || mkdir scripts
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cp "${PNGSRC}"/scripts/pnglibconf.mak scripts
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cp "${PNGSRC}"/scripts/pnglibconf.dfa scripts
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cp "${PNGSRC}"/scripts/options.awk scripts
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# change the following if zlib is somewhere else
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test -n "${ZLIBSRC}" || ZLIBSRC="${PNGSRC}"/../zlib
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cp "${ZLIBSRC}"/*.h .
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cp "${ZLIBSRC}"/*.c .
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rm inf*.[ch]
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rm minigzip.c example.c gz*
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@@ -4,8 +4,10 @@
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#CC=cc
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CC=gcc
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LD=$(CC)
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STRIP=strip
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RM=rm -f
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COPY=cp
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CFLAGS=-DPNG_USER_CONFIG -DNO_GZIP -I. -O1
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@@ -14,13 +16,62 @@ O=.o
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L=.a
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E=
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# Where to find the source code:
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PNGSRC =../../..
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ZLIBSRC=$(PNGSRC)/../zlib
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PROGSRC=$(PNGSRC)/contrib/pngminus
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# Zlib
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ZSRCS = adler32$(C) compress$(C) crc32$(C) deflate$(C) \
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trees$(C) zutil$(C)
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# Standard headers
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#ZH = zlib.h crc32.h deflate.h trees.h zutil.h
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ZH = zlib.h crc32.h deflate.h trees.h zutil.h
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# Machine generated headers
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ZCONF = zconf.h
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# Headers callers use
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ZINC = zlib.h $(ZCONF)
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# Headers the Zlib source uses
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ZHDRS = $(ZH) $(ZCONF)
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# compress is not required; it is needed to link the zlib
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# code because deflate defines an unused API function deflateBound
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# which itself calls compressBound from compress.
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ZOBJS = adler32$(O) compress$(O) crc32$(O) deflate$(O) \
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dummy_inflate$(O) \
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trees$(O) uncompr$(O) zutil$(O)
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trees$(O) zutil$(O)
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OBJS = pnm2pngm$(O) png$(O) pngerror$(O) pngget$(O) pngmem$(O) \
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# libpng
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PNGSRCS=png$(C) pngerror$(C) pngget$(C) pngmem$(C) \
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pngset$(C) pngtrans$(C) pngwio$(C) pngwrite$(C) \
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pngwtran$(C) pngwutil$(C)
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# Standard headres
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PNGH =png.h pngconf.h pngdebug.h pnginfo.h pngpriv.h pngstruct.h
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# Machine generated headers
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PNGCONF=pnglibconf.h
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# Headers callers use
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PNGINC= png.h pngconf.h pngusr.h $(PNGCONF)
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# Headers the PNG library uses
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PNGHDRS=$(PNGH) $(PNGCONF) pngusr.h
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PNGOBJS=png$(O) pngerror$(O) pngget$(O) pngmem$(O) \
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pngset$(O) pngtrans$(O) pngwio$(O) pngwrite$(O) \
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pngwtran$(O) pngwutil$(O) $(ZOBJS)
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pngwtran$(O) pngwutil$(O)
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PROGSRCS= pnm2pngm$(C)
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PROGHDRS=
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PROGDOCS=
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PROGOBJS= pnm2pngm$(O)
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OBJS = $(PROGOBJS) $(PNGOBJS) $(ZOBJS)
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# implicit make rules -------------------------------------------------------
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@@ -33,18 +84,63 @@ all: pnm2pngm$(E)
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pnm2pngm$(E): $(OBJS)
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$(LD) -o pnm2pngm$(E) $(OBJS)
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strip pnm2pngm$(E)
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$(STRIP) pnm2pngm$(E)
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pnglibconf.h: scripts/pnglibconf.mak scripts/pnglibconf.dfa scripts/options.awk pngusr.h
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rm -f pnglibconf.h
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$(MAKE) $(MAKEFLAGS) -f scripts/pnglibconf.mak CPPFLAGS=-DPNG_USER_CONFIG $@
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# The DFA_XTRA setting turns all libpng options off then
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# turns on those required for this minimal build.
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# The CPP_FLAGS setting causes pngusr.h to be included in
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# both the build of pnglibconf.h and, subsequently, when
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# building libpng itself.
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$(PNGCONF): $(PNGSRC)/scripts/pnglibconf.mak\
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$(PNGSRC)/scripts/pnglibconf.dfa \
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$(PNGSRC)/scripts/options.awk pngusr.h pngusr.dfa
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$(RM) pnglibconf.h pnglibconf.dfn
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$(MAKE) $(MAKEFLAGS) -f $(PNGSRC)/scripts/pnglibconf.mak\
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srcdir=$(PNGSRC) CPPFLAGS="-DPNG_USER_CONFIG"\
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DFA_XTRA="pngusr.dfa" $@
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clean:
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$(MAKE) $(MAKEFLAGS) -f scripts/pnglibconf.mak clean
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$(MAKE) $(MAKEFLAGS) -f $(PNGSRC)/scripts/pnglibconf.mak\
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srcdir=$(PNGSRC) clean
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$(RM) pnm2pngm$(O)
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$(RM) pnm2pngm$(E)
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$(RM) $(OBJS)
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$(OBJS): png.h pngconf.h pnglibconf.h pngpriv.h pngstruct.h pnginfo.h pngdebug.h pngusr.h zlib.h
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# distclean also removes the copied source and headers
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distclean: clean
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$(RM) -r scripts # historical reasons
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$(RM) $(PNGSRCS) $(PNGH)
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$(RM) $(ZSRCS) $(ZH) $(ZCONF)
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$(RM) $(PROGSRCS) $(PROGHDRS) $(PROGDOCS)
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# Header file dependencies:
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$(PROGOBJS): $(PROGHDRS) $(PNGINC) $(ZINC)
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$(PNGOBJS): $(PNGHDRS) $(ZINC)
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$(ZOBJS): $(ZHDRS)
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# Gather the source code from the respective directories
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$(PNGSRCS) $(PNGH): $(PNGSRC)/$@
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$(RM) $@
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$(COPY) $(PNGSRC)/$@ $@
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# No dependency on the ZLIBSRC target so that it only needs
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# to be specified once.
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$(ZSRCS) $(ZH):
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$(RM) $@
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$(COPY) $(ZLIBSRC)/$@ $@
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# The unconfigured zconf.h varies in name according to the
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# zlib release
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$(ZCONF):
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$(RM) $@
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@for f in zconf.h.in zconf.in.h zconf.h; do\
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test -r $(ZLIBSRC)/$$f &&\
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echo $(COPY) $(ZLIBSRC)/$$f $@ &&\
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$(COPY) $(ZLIBSRC)/$$f $@ && exit 0;\
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done; echo copy: $(ZLIBSRC)/zconf.h not found; exit 1
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pnm2pngm.c: $(PROGSRC)/pnm2png.c
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$(RM) $@
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$(COPY) $(PROGSRC)/pnm2png.c $@
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# End of makefile for pnm2pngm
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24
contrib/pngminim/encoder/pngusr.dfa
Normal file
24
contrib/pngminim/encoder/pngusr.dfa
Normal file
@@ -0,0 +1,24 @@
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# pngminim/encoder/pngusr.dfa
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#
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# Copyright (c) 2010 Glenn Randers-Pehrson
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#
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# This code is released under the libpng license.
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# For conditions of distribution and use, see the disclaimer
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# and license in png.h
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# First all the build options off:
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everything = off
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# Switch on the write code - this makes a minimalist encoder
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option WRITE on
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# You must choose fixed or floating point arithmetic:
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option FLOATING_POINT on
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# option FIXED_POINT on
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# Your program will probably need other options. The example
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# program here, pnm2pngm, requires the following. Take a look
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# at pnglibconf.h to find out the full set of what has to be
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# enabled to make the following work.
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option SETJMP on
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option STDIO on
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@@ -12,64 +12,17 @@
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#ifndef MINWRPNGCONF_H
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#define MINWRPNGCONF_H
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#define PNG_USER_PRIVATEBUILD "PNG minimal build"
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#define PNG_USER_DLLFNAME_POSTFIX "MN"
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#define PNG_NO_READ_SUPPORTED
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/* If pngusr.h is included during the build the following must
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* be defined either here or in the .dfa file (pngusr.dfa in
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* this case). To include pngusr.h set -DPNG_USER_CONFIG in
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* CPPFLAGS
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*/
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#define PNG_USER_PRIVATEBUILD "libpng minimal conformant PNG encoder"
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#define PNG_USER_DLLFNAME_POSTFIX "me"
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/* List options to turn off features of the build that do not
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* affect the API (so are not recorded in pnglibconf.h)
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*/
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#define PNG_NO_WARNINGS
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#define PNG_NO_ERROR_TEXT
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#define PNG_NO_WRITE_BACKGROUND
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#define PNG_NO_WRITE_BGR
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#define PNG_NO_WRITE_GAMMA
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#define PNG_NO_WRITE_QUANTIZE
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#define PNG_NO_WRITE_INVERT
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#define PNG_NO_WRITE_SHIFT
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#define PNG_NO_WRITE_PACK
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#define PNG_NO_WRITE_PACKSWAP
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#define PNG_NO_WRITE_FILLER
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#define PNG_NO_WRITE_SWAP
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#define PNG_NO_WRITE_SWAP_ALPHA
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#define PNG_NO_WRITE_INVERT_ALPHA
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#define PNG_NO_WRITE_RGB_TO_GRAY
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#define PNG_NO_WRITE_USER_TRANSFORM
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#define PNG_NO_WRITE_bKGD
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#define PNG_NO_WRITE_cHRM
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#define PNG_NO_WRITE_gAMA
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#define PNG_NO_WRITE_hIST
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#define PNG_NO_WRITE_iCCP
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#define PNG_NO_WRITE_oFFs
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#define PNG_NO_WRITE_pCAL
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#define PNG_NO_WRITE_pHYs
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#define PNG_NO_WRITE_sBIT
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#define PNG_NO_WRITE_sCAL
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#define PNG_NO_WRITE_sPLT
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#define PNG_NO_WRITE_sRGB
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#define PNG_NO_WRITE_TEXT
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#define PNG_NO_WRITE_tIME
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#define PNG_NO_WRITE_UNKNOWN_CHUNKS
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#define PNG_NO_WRITE_USER_CHUNKS
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#define PNG_NO_WRITE_EMPTY_PLTE
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#define PNG_NO_WRITE_OPT_PLTE
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#define PNG_NO_WRITE_FILTER
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#define PNG_NO_WRITE_WEIGHTED_FILTER
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#define PNG_NO_WRITE_INTERLACING_SUPPORTED
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#define PNG_NO_WRITE_FLUSH
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#define PNG_NO_INFO_IMAGE
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#define PNG_NO_IO_STATE
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#define PNG_NO_USER_MEM
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#define PNG_NO_FIXED_POINT_SUPPORTED
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#define PNG_NO_MNG_FEATURES
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#define PNG_NO_USER_TRANSFORM_PTR
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#define PNG_NO_HANDLE_AS_UNKNOWN
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#define PNG_NO_CONSOLE_IO
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#define PNG_NO_ZALLOC_ZERO
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#define PNG_NO_ERROR_NUMBERS
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#define PNG_NO_EASY_ACCESS
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#define PNG_NO_USER_LIMITS
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#define PNG_NO_SET_USER_LIMITS
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#define PNG_NO_TIME_RFC1123
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#endif /* MINWRPNGCONF_H */
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