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Assume input is pre-multiplied.

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git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/back/trunk@14332 72102866-910b-0410-8b05-ffd578937521
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alexm 2002-08-25 22:34:34 +00:00
parent 774fa9ded4
commit dfe92c535b
2 changed files with 12 additions and 0 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2002-08-26 00:33 Alexander Malmberg <alexander@malmberg.org>
* Source/art/ARTContext.m (-DPSimage:::::::::::): Assume input is
pre-multiplied.
2002-08-25 21:41 Alexander Malmberg <alexander@malmberg.org>
* Source/art/ARTContext.m (-_composite_func::::::): Implement

7
Source/art/ARTContext.m
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@ -2128,6 +2128,13 @@ and that covers most (all?) actual uses of it */
if (hasAlpha)
{
ri.a=src[3];
/* TODO: find out if input is premultiplied or not */
if (ri.a && ri.a!=255)
{
ri.r=(255*ri.r)/ri.a;
ri.g=(255*ri.g)/ri.a;
ri.b=(255*ri.b)/ri.a;
}
if (alpha_dest)
{
if (src[3]==255)