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Now that ClutterActor has a convenient API for getting the stage views an actor is presented on, we can remove a large part of the code for resource-scale calculation and instead rely on the stage-views list. The way this works is a bit different from the old resource scales: clutter_actor_get_resource_scale() always returns a scale, but this value is only guaranteed to be correct when called from a vfunc_paint() implementation, in all other cases the value is guessed using the scale of the parent actor or the last valid scale. Now in case the value previously reported by clutter_actor_get_resource_scale() turns out to be wrong, "resource-scale-changed" will be emitted before the next paint and the actor has a chance to update its resources. The general idea behind this new implementation is for actors which only need the scale during painting to continue using clutter_actor_get_resource_scale() as they do right now, and for actors which need the resource scale on other occasions, like during size negotiation, to use the scale reported by clutter_actor_get_resource_scale() but also listen to the "resource-scale-changed" signal to eventually redo the work using the correct scale. The "guessing" of the scale is done with the intention of always giving actors a scale to work with so they don't have to fall back to a scale value the actor itself has to define, and also with the intention of emitting the "resource-scale-changed" signal as rarely as possible, so that when an actor is newly created, it won't have to load its resources multiple times. The big advantage this has over the old resource scales is that it's now safe to call clutter_actor_get_resource_scale() from everywhere (before, calling it from size negotiation functions would usually fail). It will also make it a lot easier to use the resource scale for complex cases like ClutterText without risking to get into relayout loops. https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1276 |
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