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+readme.txt - for libpng 0.90
+
+This is the fourth beta version of libpng 1.0. The changes from
+libpng-0.89 include bug fixes, a C++ wrapper for png.h, some
+additions to the API, as well as internal changes to the library.
+
+**
+Note that some of the changes to the png_info structure render
+this version of the library binary incompatible with libpng-0.89
+if you are using a shared library. Re-compiling the application
+should be enough to remove this problem.
+**
+
+The additions to 0.89 include the ability to read from a PNG stream
+which has had some (or all) of the signature bytes read by the
+calling application. This also allows the reading of embedded PNG
+streams that do not have the PNG file signature. As well, it is
+now possible to set the library action on the detection of chunk
+CRC errors. It is possible to set different actions based on
+whether the error occurred in a critical or an ancillary chunk.
+
+The callback functions for the error/warning messages have changed
+since the 0.88 release because their implementation was broken,
+and it was thought best to change the API itself (which was only
+introduced in libpng-0.88 itself) to alert the user to the change,
+rather than mislead the user into thinking their application was
+OK after re-compiling. This means that calls to png_set_message_fn()
+no longer exist, because the previously suggested method of calling
+them before png_read_init() or png_write_init() is now ineffective.
+
+The preferred method of setting the error and warning callbacks
+has been incorporated into the allocation of the png_struct and
+info_struct itself, which allow them to be safely used during the
+initialization of the structure, as well as to keep the size of
+the png_struct internal to the library, rather than at compile time
+of the application. This will hopefully remove any problems with
+dynamically linked libraries, and should be considered the preferred
+method of creating these structures, although the previous
+initialization API is still available for compatibility. See libpng.txt
+for more information on the new API.
+
+The changes made to the library, and bugs fixed are based on discussions
+on the PNG implementation mailing list <png-implement@dworking.wustl.edu>
+and not on material submitted to Guy.
+
+For a detailed description on using libpng, read libpng.txt. For
+usage information and restrictions (what little they are) on libpng,
+see png.h. For a description on using zlib (the compression library
+used by libpng) and zlib's restrictions, see zlib.h
+
+I have included a general makefile, as well as several machine and compiler
+specific ones, but you may have to modify one for your own needs.
+
+You should use zlib 1.0.4 or later to run this, but it MAY work with
+versions as old as zlib 0.95. Even so, there are bugs in older zlib
+versions which can cause the output of invalid compression streams for
+some images. You will definitely need zlib 1.0.4 or later if you are
+taking advantage of the MS-DOS "far" structure allocation for the small
+and medium memory models. You should also note that zlib is a
+compression library that is useful for more things than just PNG files.
+You can use zlib as a drop-in replacement for fread() and fwrite() if
+you are so inclined.
+
+zlib should be available at the same place that libpng is.
+If not, it should be at ftp.uu.net in /graphics/png
+Eventually, it will be at ftp.uu.net in /pub/archiving/zip/zlib
+
+You may also want a copy of the PNG specification. It is available
+as an Internet Draft, and RFC, and a W3C Recommendation. Failing
+these resources you can try ftp.uu.net in the /graphics/png directory.
+
+This code is currently being archived at ftp.uu.net in the
+/graphics/png directory, and on CompuServe, Lib 20 (PNG SUPPORT)
+at GO GRAPHSUP. If you can't find it in any of those places,
+e-mail me, and I'll help you find it.
+
+If you have any code changes, requests, problems, etc., please e-mail
+them to me. Also, I'd appreciate any make files or project files,
+and any modifications you needed to make to get libpng to compile,
+along with a #define variable to tell what compiler/system you are on.
+If you needed to add transformations to libpng, or wish libpng would
+provide the image in a different way, drop me a note (and code, if
+possible), so I can consider supporting the transformation.
+Finally, if you get any warning messages when compiling libpng
+(note: not zlib), and they are easy to fix, I'd appreciate the
+fix. Please mention "libpng" somewhere in the subject line. Thanks.
+
+This release was created and will be supported by myself (of course
+based in a large way on Guy's earlier work), and the PNG group.
+
+adilger@enel.ucalgary.ca
+png-implement@dworkin.wustl.edu
+
+You can reach Guy, the original libpng author, at (internet preferred):
+
+internet: schalnat@group42.com
+CompuServe: 75501,1625
+
+Please do not send general questions about PNG. Send them to
+the address in the specification. At the same time, please do
+not send libpng questions to that address, send them to me. I'll
+get them in the end anyway. If you have a question about something
+in the PNG specification that is related to using libpng, send it
+to me. Send me any questions that start with "I was using libpng,
+and ...". If in doubt, send questions to me. I'll bounce them
+to others, if necessary.
+
+Please do not send suggestions on how to change PNG. We have
+been discussing PNG for a couple years now, and it is official and
+finished. If you have suggestions for libpng, however, I'll
+gladly listen. Even if your suggestion is not used for version
+1.0, it may be used later.
+
+Files in this distribution:
+
+ CHANGES.txt => Description of changes between libpng versions
+ README => This file
+ TODO => Things not implemented in the current library
+ ansi2knr.c => Converts files to K&R style function declarations
+ build.bat => MS-DOS batch file for Borland compiler
+ descrip.mms => VMS project file
+ example.c => Example code for using libpng functions
+ libpng.txt => Description of libpng and its functions
+ makefile => Defualt makefile
+ makefile.aco => ACORN makefile
+ makefile.ama => Amiga makefile
+ makefile.atr => Atari makefile
+ makefile.bor => Borland makefile
+ makefile.dj2 => DJGPP 2 makefile
+ makefile.elf => Unix ELF makefile
+ makefile.knr => Makefile which calls ansi2knr to convert files
+ makefile.mip => MIPS makefile
+ makefile.msc => Microsoft C makefile
+ makefile.std => Standard Unix makefile
+ makefile.tc => Turbo C makefile
+ makevms.com => VMS make program
+ png.c => Basic interface functions common to library
+ png.h => Library function and interface declarations
+ pngconf.h => System specific library configuration
+ pngerror.c => Error/warning message I/O functions
+ pngmem.c => Memory handling functions
+ pngpread.c => Progressive reading functions
+ pngrcb.c => Read callback (data handling) low-level functions
+ pngread.c => Read data/helper high-level functions
+ pngrio.c => Lowest-level data read I/O functions
+ pngrtran.c => Read data transformation functions
+ pngrutil.c => Read data utility functions
+ pngtest.c => Library test program
+ pngtest.png => Library test sample image
+ pngtrans.c => Common data transformation functions
+ pngwio.c => Lowest-level write I/O functions
+ pngwrite.c => High-level write functions
+ pngwtran.c => Write data transformations
+ pngwutil.c => Write utility functions
+
+Good luck, and happy coding.
+
+-Andreas Eric Dilger
+ University of Calgary
+ Internet: adilger@enel.ucalgary.ca
+ Web: www-mddsp.enel.ucalgary.ca/People/adilger/
+
+-Guy Eric Schalnat
+ Group 42, Inc.
+ Internet: schalnat@group42.com
+ CompuServe: 75501,1625
+ Web: www.group42.com
+