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Now that the code works consistently so that these just switch off the support for having libpng do the interlace/deinterlace the old names make more sense, restoring them avoids cruft in the configuration file and avoids an unnecessary version specific change. Signed-off-by: John Bowler <jbowler@acm.org>
This demonstrates the use of PNG_USER_CONFIG, pngusr.h and pngusr.dfa The makefile builds a minimal read-only decoder with embedded libpng and zlib. Specify the location of the zlib source (1.2.1 or later) as ZLIBSRC on the make command line. If you prefer to use the shared libraries, go to contrib/pngminus and build the png2pnm application there.