macoscore-graphics

CGBitmapContextCreate: unsupported parameter combination

I'm getting this error when creating a bitmap context:

CGBitmapContextCreate: unsupported parameter combination: 8 integer bits/component; 24 bits/pixel; 3-component color space; kCGImageAlphaNone; 7936 bytes/row.

Here's the code (note that the context is based on the parameters of an existing CGImage:

context = CGBitmapContextCreate(NULL,
                                (int)pi.bufferSizeRequired.width,
                                (int)pi.bufferSizeRequired.height,
                                CGImageGetBitsPerComponent(imageRef),
                                0,
                                CGImageGetColorSpace(imageRef),
                                CGImageGetBitmapInfo(imageRef));

Width is 2626, height is 3981. I've leaving bytesPerRow at zero so that it gets calculated automatically for me, and it's chosen 7936 of its own accord.

So, where on Earth is the inconsistency? It's driving me nuts.

Solution

  • For reasons that I don't understand I solved this by setting the BitmapInfo parameter to kCGImageAlphaNoneSkipLast.