shaped-texture: Add debug paint overlay for opaque regions
From the last commit:
Using opaque painting paths can have a big impact on painting performance.
In order to easily validate whether we use the opaque paths, add a opaque
(green) or blended (purple) overlay over painted areas if the
`META_DEBUG_PAINT_OPAQUE_REGION` `MetaDebugPaintFlag` is set.
You can do so in `lg` via:
`Meta.add_debug_paint_flag(Meta.DebugPaintFlag.OPAQUE_REGION)`
This can be helpful for application developers, as previously it was not
trivial to check whether e.g. Wayland or X11 opaque regions where
properly set.This is how it looks like:
Context:
Edited by Robert Mader