Henrik Nordström wrote: > Documentaiton on how to adopt application code to work properly with > libpng 1.4+ is readily available. Some notes from upstream: http://www.libpng.org/pub/png/libpng.html ==cut== Portability Note The libpng 1.5.x series continues the evolution of the libpng API, finally hiding the contents of the venerable and hoary png_struct and png_info data structures inside private (i.e., non-installed) header files. Instead of direct struct-access, applications should be using the various png_get_xxx() and png_set_xxx() accessor functions, which have existed for almost as long as libpng itself. (Apps that compiled against libpng 1.4 without warnings about deprecated features should happily compile against 1.5, too.) The above should not come as a particular surprise to anyone who has added libpng support to an application this millenium; the manual has warned of it since at least July 2000. (Specifically: "Starting with version 2.0.0, both structures are going to be hidden, and the contents of the structures will only be accessible through the png_get/png_set functions." OK, so the version number was off a bit...and the grammar, too, but who's counting?) Those who are happy with the current level of PNG support in their apps need not panic, however; libpng 1.2.x will continue to get security fixes for the foreseeable future. (1.0.x has gotten them for more than a decade even though Greg no longer bothers to list that series here.) The 1.5.x series also includes a new, more thorough test program (pngvalid.c) and a new pnglibconf.h header file that tracks what features were enabled or disabled when libpng was built. On the other hand, it no longer internally includes the zlib.h header file, so applications that formerly depended on png.h to provide that will now need to include it explicitly. Complete differences relative to libpng 1.4.x are detailed here.[1] ==end== [1] Changes to Libpng from version 1.4.5 to 1.5.0 (January 6, 2011) http://libpng.org/pub/png/src/libpng-1.4.x-to-1.5.x-summary.txt Changes to Libpng from version 1.2.42 to 1.4.0 (January 4, 2010) http://www.libpng.org/pub/png/src/libpng-1.2.x-to-1.4.x-summary.txt ftp://ftp.simplesystems.org/pub/png/src/history/libpng-1.4.0-README.txt ftp://ftp.simplesystems.org/pub/png/src/history/libpng-1.5.0-README.txt API changes/compatibility test results for the libpng library http://linuxtesting.org/upstream-tracker/versions/libpng.html -- devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/devel
