screencopy: don't force opaque window backgrounds #1022
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This meant that, for windows that were not fully opaque, there was no way to capture their transparency. No way to put a window with transparency on top of a background in OBS, for example.
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This meant that, for windows that were not fully opaque, there was no way to capture their transparency. No way to put a window with transparency on top of a background in OBS, for example.
(Thanks @tranquillity-codes for teaching me about pre-multiplied alpha when I was going down the wrong track)