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diff --git a/readme.txt b/readme.txt deleted file mode 100644 index 9da76ce71..000000000 --- a/readme.txt +++ /dev/null @@ -1,106 +0,0 @@ -readme.txt - for libpng 0.89 - -This is a bug fix for the third beta version of libpng 1.0. The -changes from libpng-0.88 are bug fixes and some changes to the -API itself to increase robustness with shared libraries. This -release is based on libpng-0.88, but has been modified from that -version by Andreas Dilger <adilger@enel.ucalgary.ca> because the -original author, Guy Schalnat, has not been able to keep up with -the time demands of maintaining this library. - -The callback functions for the error/warning messages have changed -since the last 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 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. There was a bug in -zlib <= 0.99 which caused it to generate invalid compression streams -on some occasions. Later versions of zlib do not have this problem. - -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 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. - -This release was created and will be supported by myself, 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 over a year 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 - |