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doc: Update the README and TODO files
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‎README

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"PNG: The Definitive Guide" by Greg Roelofs,
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O'Reilly, 1999
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libtests/ => Test programs
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oss-fuzz/ => Files used by the OSS-Fuzz project for fuzz-testing
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libpng
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pngexif/ => Program to inspect the EXIF information in PNG files
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pngminim/ => Minimal decoder, encoder, and progressive decoder
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programs demonstrating the use of pngusr.dfa

‎TODO

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TODO - list of things to do for libpng:
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TODO list for libpng
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--------------------
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* Fix all defects (duh!)
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* Better C++ wrapper / full C++ implementation (?)
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* Fix the problems with C++ and 'extern "C"'.
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* cHRM transformation.
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* Palette creation.
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* "grayscale->palette" transformation and "palette->grayscale" detection.
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* Improved dithering.
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* Multi-lingual error and warning message support.
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* Complete sRGB transformation. (Currently it simply uses gamma=0.45455.)
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* Man pages for function calls.
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* Better documentation.
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* Better filter selection
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(e.g., counting huffman bits/precompression; filter inertia; filter costs).
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* Histogram creation.
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* Text conversion between different code pages (e.g., Latin-1 -> Mac).
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* Avoid building gamma tables whenever possible.
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* Greater precision in changing to linear gamma for compositing against
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background, and in doing rgb-to-gray transformations.
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* Investigate pre-incremented loop counters and other loop constructions.
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* Interpolated method of handling interlacing.
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* More validations for libpng transformations.
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* Fix all defects (duh!)
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* cHRM transformation.
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* Palette creation.
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* "grayscale->palette" transformation and "palette->grayscale" detection.
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* Improved dithering.
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* Multi-lingual error and warning message support.
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* Complete sRGB transformation. (Currently it simply uses gamma=0.45455.)
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* Man pages for function calls.
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* Better documentation.
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* Better filter selection
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(e.g., counting huffman bits/precompression; filter inertia; filter costs).
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* Histogram creation.
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* Text conversion between different code pages (e.g., Latin-1 to Mac).
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* Avoid building gamma tables whenever possible.
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* Greater precision in changing to linear gamma for compositing against
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background, and in doing rgb-to-gray transformations.
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* Investigate pre-incremented loop counters and other loop constructions.
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* Interpolated method of handling interlacing.
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* More validations for libpng transformations.

‎contrib/README.txt

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External contributions to libpng
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--------------------------------
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This "contrib" directory contains contributions which are not necessarily under
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the libpng license, although all are open source. They are not part of

‎scripts/README.txt

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Scripts and makefiles for libpng
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--------------------------------
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Makefiles for libpng
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pnglibconf.h.prebuilt => Configuration settings
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pnglibconf.h.prebuilt => Configuration settings
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makefile.linux => Linux/ELF makefile
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(gcc, creates shared libpng16.so.16.1.6.*)
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makefile.linux-opt=> Linux/ELF makefile with hardware optimizations on
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(gcc, creates shared libpng16.so.16.1.6.*)
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makefile.gcc => Generic makefile (gcc, creates static libpng.a)
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makefile.acorn => Acorn makefile
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makefile.aix => AIX/gcc makefile
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makefile.amiga => Amiga makefile
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makefile.atari => Atari makefile
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makefile.bc32 => 32-bit Borland C++ (all modules compiled in C mode)
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makefile.beos => BeOS makefile
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makefile.clang => Generic clang makefile
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makefile.darwin => Darwin makefile, for macOS (formerly Mac OS X)
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makefile.dec => DEC Alpha UNIX makefile
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makefile.dj2 => DJGPP 2 makefile
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makefile.freebsd => FreeBSD makefile
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makefile.gcc => Generic gcc makefile
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makefile.hpgcc => HPUX makefile using gcc
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makefile.hpux => HPUX (10.20 and 11.00) makefile
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makefile.hp64 => HPUX (10.20 and 11.00) makefile, 64-bit
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makefile.ibmc => IBM C/C++ version 3.x for Win32 and OS/2 (static)
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makefile.intel => Intel C/C++ version 4.0 and later
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makefile.mips => MIPS makefile
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makefile.netbsd => NetBSD/cc makefile, makes shared libpng.so
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makefile.openbsd => OpenBSD makefile
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makefile.sco => SCO OSr5 ELF and Unixware 7 with Native cc
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makefile.sggcc => Silicon Graphics makefile
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(gcc, creates shared libpng16.so.16.1.6.*)
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makefile.sgi => Silicon Graphics IRIX makefile (cc, creates static lib)
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makefile.solaris => Solaris 2.X makefile
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(gcc, creates shared libpng16.so.16.1.6.*)
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makefile.so9 => Solaris 9 makefile
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(gcc, creates shared libpng16.so.16.1.6.*)
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makefile.std => Generic UNIX makefile (cc, creates static libpng.a)
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makefile.sunos => Sun makefile
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makefile.32sunu => Sun Ultra 32-bit makefile
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makefile.64sunu => Sun Ultra 64-bit makefile
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makefile.vcwin32 => makefile for Microsoft Visual C++ 4.0 and later
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makevms.com => VMS build script
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smakefile.ppc => AMIGA smakefile for SAS C V6.58/7.00 PPC compiler
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(Requires SCOPTIONS, copied from scripts/SCOPTIONS.ppc)
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makefile.aix => AIX/gcc makefile
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makefile.amiga => Amiga makefile
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makefile.atari => Atari makefile
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makefile.bc32 => Borland C makefile, for Win32
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makefile.beos => BeOS makefile
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makefile.clang => Generic clang makefile
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makefile.darwin => Darwin makefile, for macOS (formerly Mac OS X)
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makefile.dec => DEC Alpha UNIX makefile
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makefile.dj2 => DJGPP 2 makefile
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makefile.emcc => Emscripten makefile
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makefile.freebsd => FreeBSD makefile
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makefile.gcc => Generic gcc makefile
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makefile.hpgcc => HPUX makefile using gcc
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makefile.hpux => HPUX (10.20 and 11.00) makefile
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makefile.hp64 => HPUX (10.20 and 11.00) makefile, 64-bit
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makefile.ibmc => IBM C/C++ version 3.x for Win32 and OS/2 (static lib)
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makefile.intel => Intel C/C++ version 4.0 and later
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makefile.linux => Linux/ELF makefile
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(gcc, creates shared libpng16.so.16.1.6.*)
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makefile.mips => MIPS makefile
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makefile.msys => MSYS (MinGW) makefile
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makefile.netbsd => NetBSD/cc makefile, makes shared libpng.so
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makefile.openbsd => OpenBSD makefile
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makefile.riscos => Acorn RISCOS makefile
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makefile.sco => SCO OSr5 ELF and Unixware 7 with Native cc
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makefile.sgi => Silicon Graphics IRIX makefile (cc, static lib)
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makefile.sggcc => Silicon Graphics makefile
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(gcc, creates shared libpng16.so.16.1.6.*)
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makefile.solaris => Solaris 2.X makefile
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(gcc, creates shared libpng16.so.16.1.6.*)
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makefile.so9 => Solaris 9 makefile
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(gcc, creates shared libpng16.so.16.1.6.*)
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makefile.std => Generic UNIX makefile (cc, static lib)
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makefile.sunos => Sun makefile
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makefile.32sunu => Sun Ultra 32-bit makefile
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makefile.64sunu => Sun Ultra 64-bit makefile
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makefile.vcwin32 => makefile for Microsoft Visual C++ 4.0 and later
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makevms.com => VMS build script
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smakefile.ppc => AMIGA smakefile for SAS C V6.58/7.00 PPC compiler
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(Requires SCOPTIONS, copied from SCOPTIONS.ppc)
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Other supporting scripts:
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README.txt => This file
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descrip.mms => VMS makefile for MMS or MMK
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libpng-config-body.in => used by several makefiles to create libpng-config
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libpng-config-head.in => used by several makefiles to create libpng-config
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libpng.pc.in => Used by several makefiles to create libpng.pc
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pngwin.rc => Used by the visualc71 project
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pngwin.def => Used by makefile.os2
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pngwin.dfn => Used to maintain pngwin.def
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SCOPTIONS.ppc => Used with smakefile.ppc
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Other supporting scripts
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------------------------
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checksym.awk => Used for maintaining pnglibconf.h
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def.dfn => Used for maintaining pnglibconf.h
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options.awk => Used for maintaining pnglibconf.h
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pnglibconf.dfa => Used for maintaining pnglibconf.h
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pnglibconf.mak => Used for maintaining pnglibconf.h
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sym.dfn => Used for symbol versioning
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symbols.def => Used for symbol versioning
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symbols.dfn => Used for symbol versioning
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vers.dfn => Used for symbol versioning
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README.txt => This file
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descrip.mms => VMS makefile for MMS or MMK
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libpng-config-body.in => used by several makefiles to create libpng-config
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libpng-config-head.in => used by several makefiles to create libpng-config
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libpng.pc.in => Used by several makefiles to create libpng.pc
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macro.lst => Used by GNU Autotools
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pngwin.rc => Used by the visualc71 project
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pngwin.def => Used by makefile.os2
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pngwin.dfn => Used to maintain pngwin.def
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SCOPTIONS.ppc => Used with smakefile.ppc
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libtool.m4 => Used by autoconf tools
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ltoptions.m4 => Used by autoconf tools
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ltsugar.m4 => Used by autoconf tools
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ltversion.m4 => Used by autoconf tools
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lt~obsolete.m4 => Used by autoconf tools
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intprefix.dfn => Used by autoconf tools
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macro.lst => Used by autoconf tools
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prefix.dfn => Used by autoconf tools
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checksym.awk => Used for maintaining pnglibconf.h
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dfn.awk => Used for maintaining pnglibconf.h
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options.awk => Used for maintaining pnglibconf.h
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pnglibconf.dfa => Used for maintaining pnglibconf.h
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pnglibconf.mak => Used for maintaining pnglibconf.h
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intprefix.c => Used for symbol versioning
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prefix.c => Used for symbol versioning
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sym.c => Used for symbol versioning
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symbols.c => Used for symbol versioning
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vers.c => Used for symbol versioning
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Further information can be found in comments in the individual scripts and
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makefiles.

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