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2020-09-26modules/compose: set default layersVito Caputo
In case some code path creates module contexts and renders without applying settings, it's important to ensure there are defaults. As-is this would have crashed compose because compose_layers would have been NULL, and compose_create_context() assumed compose_layers always contained something useful. Montage would have been an example of this, though for other reasons montage has had compose disabled so I don't think anything currently would have triggered this.
2020-09-25modules/compose: add a rudimentary compositing moduleVito Caputo
--module=compose,layers=first:second:third:... this draws the named modules in the order listed, overdrawing the output of the previous layers in a cumulative fashion.
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