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NSCompositeSourceOver equivalent in Quartz 2D?

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NSCompositeSourceOver equivalent in Quartz 2D?

Subject: NSCompositeSourceOver equivalent in Quartz 2D?
From: "Carter R. Harrison" <email@hidden>
Date: Sun, 13 Apr 2008 16:43:57 -0400

I'm trying to do some drawing in Quartz 2D. I'm trying to set the blending mode of my CGContextRef to the equivalent of NSCompositeSourceOver from NSGraphicsContext. It doesn't look like there is such a blending mode for a CGContext. Am I mistaken in this, or is there another way of accomplishing this? It seems funny to me that this blending mode doesn't exist in Quartz given that NSGraphicsContext should be a wrapper class around CGContextRef.

Thanks in advance.
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