Quartz 2D: draw from a CGContext to another CGContext
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by alexey
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Published on 2010-06-15T09:29:23Z
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2010/06/15
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I have a CGBitmapContext (bitmapContext) and I would like to draw some rectangle part (rect) of it to the current CGContext (context).
Right now I do that way:
CGContextRef context = UIGraphicsGetCurrentContext();
CGImageRef cgImage = CGBitmapContextCreateImage(bitmapContext);
CGContextClipToRect(context, rect);
CGContextDrawImage(context, CGRectMake(0, 0, width, height), cgImage);
CGImageRelease(cgImage);
Is it optimal? What is the best way to do it?
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