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Pre-multiplied is probably wrong for ARGB, should just be Also, this would be incompatible with our docs and other platforms, we tell you to fill the opacity with |
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https://developer.apple.com/documentation/coregraphics/cgimagealphainfo?language=objc
For supporting transparent windows on maOS this is all that is required. I've seen #241 which is adding alpha and it looks significantly more complicated. I might be missing why it is so complicated but this does work and I don't see why it should be any more complicated. I've tested it with tiny_skia.
Using PremultipliedFirst instead of Last because that is consistent with the where the color channels are currently stored.