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jmenter/gist:91e8eed4104bf58e83a1

Created December 22, 2014 20:49
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Get CGContextRef from a UIView's CALayer's contents (assuming contents is a CGImageRef)
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gistfile1.m
CGImageRef image = (__bridge CGImageRef)self.view.layer.contents;
CGDataProviderRef dataProviderRef = CGImageGetDataProvider(image);
CFDataRef dataRef = CGDataProviderCopyData(dataProviderRef);
void *dataBytePointer = (void *)CFDataGetBytePtr(dataRef);
CGColorSpaceRef colorSpace = CGImageGetColorSpace(image);
CGContextRef context = CGBitmapContextCreateWithData(dataBytePointer, CGImageGetWidth(image), CGImageGetHeight(image), CGImageGetBitsPerComponent(image), CGImageGetBytesPerRow(image), colorSpace, CGImageGetBitmapInfo(image), NULL, NULL);
CGContextDoWhatever(context)...
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