PNG_TRANSFORM_INVERT_ALPHA  255 contrib/libtests/pngimage.c    { PNG_TRANSFORM_SHIFT | PNG_TRANSFORM_INVERT_ALPHA, 0/*antidote*/ }
PNG_TRANSFORM_INVERT_ALPHA 1141 pngread.c         if (transforms & PNG_TRANSFORM_INVERT_ALPHA)
PNG_TRANSFORM_INVERT_ALPHA 1649 pngwrite.c        if (transforms & PNG_TRANSFORM_INVERT_ALPHA)