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Use a compositerect to clear the alpha channel if the background color isn't opaque.

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git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/gui/trunk@14320 72102866-910b-0410-8b05-ffd578937521
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alexm 2002-08-23 00:40:41 +00:00
parent 545659a4f7
commit debd8691df
2 changed files with 19 additions and 0 deletions
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13
Source/NSImage.m
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@ -899,6 +899,19 @@ repd_for_rep(NSArray *_reps, NSImageRep *rep)
{
repd->bg = [_color copy];
[_color set];
if ([_color alphaComponent] < 1)
{
/* With a Quartz-like alpha model, alpha can't be cleared
with a rectfill, so we need to clear the alpha channel
explictly. (A compositerect with NSCompositeCopy would
be more efficient, but it doesn't seem like it's
implemented correctly in all backends yet (as of
2002-08-23). Also, this will work with both the Quartz-
and DPS-model.) */
PScompositerect(0, 0, _size.width, _size.height,
NSCompositeClear);
}
NSRectFill(NSMakeRect(0, 0, _size.width, _size.height));
}
}