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compositor: improved opacity handling

Michael Olbrich requested to merge mol/weston:opaque into main

Two improvements that avoid unnecessary work in the renderer:

  1. Surfaces with a opaque pixel format are fully opaque so set transform.opaque accordingly.
  2. Calculating the opaque area for arbitrary opaque regions and tranformations is not really possible. But there is one rather common subset: If the surface is fully opaque and the transformation is just scaling then the opaque area is the same as the bounding box.

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