Soeren Sandmann wrote:
(1) The equation would be(src OP dst) LERP_mask dstand not(src IN mask) OP dst (2) The RGB channels of Alpha-only images would be considered to be the same as the alpha channel, and not 0 as they are now. For example, a 0xb9 pixel in an a8 image would be considered equivalent to 0xb9b9b9b9 and not to 0xb9000000. That is, they would be considered a translucent white rather than a translucent black.
Why not just try making these changes directly to Render? This is pretty much what Cairo did and nobody complained. Panicking about back-compatibility when it is likely that nobody relies on the current behavior is silly.
The only software I know of using Render for anything other than OVER is Cairo, and it must be avoiding all the cases where changing this would make a difference because it does not match it's rules anyway.
Of course if there are real examples of existing and in-use clients (ie something actually distributed on Linux systems) that rely on the current behavior then you can't change it.
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