Reputation: 8480
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?
Upvotes: 3
Views: 2379
Reputation: 36016
The alternative seems to be to create a sub-image, which I can only imagine to be less optimal.
Upvotes: 2