readme.txt - third_party/libpng - Git at Google

 readme.txt - for libpng 0.86

 This is a bug fix for the second beta version of libpng 1.0, and
 a first try at a progressive (push) reader.  It hasn't been
 tested as much as the pull reader, but seems to work ok.

 I've implemented the callback functions for the error/warning
 messages and the input/output.  See the libpng.txt
 for details.  I've also added defines to support medium memory
 models, so every type now has pointer defines.  For example,
 a pointer to the png_struct is now png_structp, while a double
 pointer is now png_structpp.  The old way should work, but I'll
 be using the new way from now on in all my examples.  Those of
 you doing medium memory model or changing the error/warning
 or input/output functions should try these and report back to
 me any problems.

 I've tried to incorporate all the changes and makefiles everyone
 sent me.  However, I may of lost some in the flood.  If you sent
 me a change and I didn't put it in, send it again.  Sorry.

 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, but you may have to modify it
 for your own needs.

 You will need zlib 0.95 or later to run this.  zlib is a compression
 library that is useful for more things then just png files.  If
 you need a compression library, check out zlib.h

 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 will also want a copy of the PNG specification.  It should
 be available at the same place you picked up libpng.  If it is
 not there, 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.

 You can reach me at:

 internet: schalnat@group42.com
 CompuServe: 75501,1625

 Please do not send me 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 9 months 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.

 Good luck, and happy coding.

 -Guy Eric Schalnat
  Group 42, Inc.
  Internet: schalnat@group42.com
  CompuServe: 75501,1625
  Web: www.group42.com
	readme.txt - for libpng 0.86

	This is a bug fix for the second beta version of libpng 1.0, and
	a first try at a progressive (push) reader. It hasn't been
	tested as much as the pull reader, but seems to work ok.

	I've implemented the callback functions for the error/warning
	messages and the input/output. See the libpng.txt
	for details. I've also added defines to support medium memory
	models, so every type now has pointer defines. For example,
	a pointer to the png_struct is now png_structp, while a double
	pointer is now png_structpp. The old way should work, but I'll
	be using the new way from now on in all my examples. Those of
	you doing medium memory model or changing the error/warning
	or input/output functions should try these and report back to
	me any problems.

	I've tried to incorporate all the changes and makefiles everyone
	sent me. However, I may of lost some in the flood. If you sent
	me a change and I didn't put it in, send it again. Sorry.

	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, but you may have to modify it
	for your own needs.

	You will need zlib 0.95 or later to run this. zlib is a compression
	library that is useful for more things then just png files. If
	you need a compression library, check out zlib.h

	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 will also want a copy of the PNG specification. It should
	be available at the same place you picked up libpng. If it is
	not there, 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.

	You can reach me at:

	internet: schalnat@group42.com
	CompuServe: 75501,1625

	Please do not send me 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 9 months 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.

	Good luck, and happy coding.

	-Guy Eric Schalnat
	Group 42, Inc.
	Internet: schalnat@group42.com
	CompuServe: 75501,1625
	Web: www.group42.com