70b00f5201ce2ff59cb9bf8f1b245287c4e64bf5
> This group functionality can be convenient for performing > intermediate compositing. One common use of a group is to > render objects as opaque within the group, (so that they > occlude each other), and then blend the result with > translucence onto the destination. https://www.cairographics.org/manual/cairo-cairo-t.html#cairo-push-group The main use case where will be to render opaque layered [MIDI] regions transparently onto a grid.
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