Glenn Randers-Pehrson 768429bbc1 [devel] Use fast integer PNG_DIVIDE_BY_255() or PNG_DIVIDE_BY_65535() ...

to accomplish alpha premultiplication when PNG_READ_COMPOSITE_NODIV_SUPPORTED
is defined.  Changed "/255" to "/255.0" in background calculations to make it
clear that the 255 is used as a double (and to prevent anyone from being
tempted to use PNG_DIVIDE_BY_255() there).

2009-11-24 07:26:06 -06:00

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