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POINTER_INDEXING was a build configuration option that we maintained in order to work around a gcc 2.7.2.2 code generation bug (circa 1997). This provided array-indexing fallback loops in `png_write_PLTE` and `png_write_sPLT`. Unfortunately, the fallback paths were effectively untested dead code in every default build, and have been a recurring source of latent bugs. (See commit48800443ebin pnggroup/libpng#801 and commitf27592a0cdin libpng 1.5.2rc02). No compiler in current use requires this accommodation.
pnglibconf - libpng configuration utilities
Copyright Notice
- Copyright (c) 2025 Cosmin Truta.
- Copyright (c) 2010-2014 Glenn Randers-Pehrson.
- Originally written by John Bowler, 2010.
Use, modification and distribution of the pnglibconf
software in the libpng distribution are subject to
the same licensing terms and conditions as libpng.
Please see the copyright notice in png.h or visit
http://libpng.org/pub/png/src/libpng-LICENSE.txt