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
In some cases Wayland surface actors are not decendents of the stage, notably subsurfaces without a parent surface. The code changes in the mentioned commits dropped the previously existing check for that - readd it. Fixes: 627ab24721 (surface-actor: Add meta_surface_actor_schedule_update()) Fixes: 7eb99ddef7 (wayland/surface: Schedule updates in the context of the surface actor) Closes: https://gitlab.gnome.org/GNOME/mutter/-/issues/3323 Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3633>
Intro ===== In general, the compositor splits the window from the contents of the window from the shape of the window. In other words, a window has contents, and the contents of the window have a shape. This is represented by the actor hierarchy: +--------------------------------------+ | MetaWindowActor | | +----------------------------------+ | | | MetaSurfaceActor | | | | +------------------------------+ | | | | | MetaShapedTexture | | | | | | | | | | | | | | | | | | | | | | | | | | | | | +------------------------------+ | | | +----------------------------------+ | +--------------------------------------+ Surfaces may also contain subsurfaces. The MetaWindowActor and MetaSurfaceActor subclasses that will be created depend on the client type, and the display server type. ## Subsurfaces Additionally, there is also the case of subsurfaces: surfaces that are child of other surfaces. That is also represented in the actor hierarchy by having one or many MetaSurfaceActors (the subsurfaces) added as children of a parent MetaSurfaceActor. There are no limits to how many subsurfaces a surface may have. With subsurfaces, the actor hierarchy looks like this: MetaWindowActor ↳ MetaSurfaceActor (surface) ↳ MetaShapedTexture ↳ MetaSurfaceActor (subsurface) ↳ MetaShapedTexture ↳ MetaSurfaceActor (sub-subsurface) ↳ MetaShapedTexture ↳ MetaSurfaceActor (subsurface) ↳ MetaShapedTexture In this example, the main surface has 2 subsurfaces. One of these subsurfaces contains a subsurface as well. All MetaWindowActors contain at least one MetaSurfaceActor, and all MetaSurfaceActors contain a MetaShapedTexture. ## Client and compositor MetaWindowActor and its subclasses represent the client window's type. A X11 client will have a MetaWindowActorX11 representing it, and a Wayland client will have a MetaWindowActorWayland. On the compositor side, the surface where the contents of the window are drawn into are represented by MetaSurfaceActor subclasses. On a Wayland session, windows are backed by a MetaSurfaceActorWayland surface, whereas on X11 sessions, by MetaSurfaceActorX11. XWayland windows are X11 client windows (MetaWindowActorX11) backed by Wayland surfaces (MetaWindowActorWayland). Env Vars ======== MUTTER_DISABLE_MIPMAPS - set to disable use of mipmaped windows.