John Bowler 4a12f4a22a [devel] Cleanup of conditional compilation code and of background/gamma ...

handling. Internal changes only except for a new option to avoid compiling
in the png_build_grayscale_palette API (which is not used at all internally.)
The main change is to move the transform tests (READ_TRANSFORMS,
WRITE_TRANSFORMS) up one level to the caller of the APIs.

2011-04-17 18:34:22 -05:00

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