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Library
Module
Module type
Parameter
Class
Class type
Sub-surface compositing.
The global interface exposing sub-surface compositing capabilities. A wl_surface, that has sub-surfaces associated, is called the parent surface. Sub-surfaces can be arbitrarily nested and create a tree of sub-surfaces.
The root surface in a tree of sub-surfaces is the main surface. The main surface cannot be a sub-surface, because sub-surfaces must always have a parent.
A main surface with its sub-surfaces forms a (compound) window. For window management purposes, this set of wl_surface objects is to be considered as a single window, and it should also behave as such.
The aim of sub-surfaces is to offload some of the compositing work within a window from clients to the compositor. A prime example is a video player with decorations and video in separate wl_surface objects. This should allow the compositor to pass YUV video buffer processing to dedicated overlay hardware when possible.
type'v t = ([ `Wl_subcompositor ], 'v, [ `Client ])Proxy.t
Create a sub-surface interface for the given surface, and associate it with the given parent surface. This turns a plain wl_surface into a sub-surface.
The to-be sub-surface must not already have another role, and it must not have an existing wl_subsurface object. Otherwise the bad_surface protocol error is raised.
Adding sub-surfaces to a parent is a double-buffered operation on the parent (see wl_surface.commit). The effect of adding a sub-surface becomes visible on the next time the state of the parent surface is applied.
The parent surface must not be one of the child surface's descendants, and the parent must be different from the child surface, otherwise the bad_parent protocol error is raised.
This request modifies the behaviour of wl_surface.commit request on the sub-surface, see the documentation on wl_subsurface interface.
Informs the server that the client will not be using this protocol object anymore. This does not affect any other objects, wl_subsurface objects included.