Glenn Randers-Pehrson 0054b566f4 [libpng15] When png_set_filler is used to strip a filler channel during write, ...

the code prior to 1.5 would ignore the case where the output required an
alpha channel or when the output was a palettized PNG.  In libpng-1.5 the
ignorance was lost and libpng proceeded to strip the channel resulting
in a bad (potential memory overwrite) failure later.  This reverts
the behavior to the pre-1.5 state but issues a warning. libpng-1.6 is
expected to issue an error on the erroneous png_set_filler call.

2012-08-08 22:13:25 -05:00

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