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subcompositor: document subsurface_from_resource
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@ -61,6 +61,12 @@ static void subsurface_destroy(struct wlr_subsurface *subsurface) {
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static const struct wl_subsurface_interface subsurface_implementation;
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/**
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* Get a wlr_subsurface from a wl_subsurface resource.
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*
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* Returns NULL if the subsurface is inert (e.g. the wl_surface object got
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* destroyed).
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*/
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static struct wlr_subsurface *subsurface_from_resource(
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struct wl_resource *resource) {
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assert(wl_resource_instance_of(resource, &wl_subsurface_interface,
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