Glenn Randers-Pehrson 7aa2927db0 [alpha] Implementing premultiplied alpha, work in progress ...

Always expand pixels to 16-bit samples when premultiplying.
  In pngconf.h, require PNG_GAMMA_SUPPORTED to be defined when defining
    PNG_READ_PREMULTIPLY_ALPHA_SUPPORTED
  Eliminated PNG_DIVIDE_BY_255 and PNG_8_BIT_PREMULTIPLY macros
    leaving only PNG_DIVIDE_BY_65535 and PNG_16_BIT_PREMULTIPLY
    because we will always work with 16 bits.

2009-11-28 18:33:19 -06:00

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