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scene: replace surface_at() with node_at()

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With the addition of a non-surface node type, it was unclear how such
nodes should interact with scene_node_surface_at().  For example, if the
topmost node at the given point is a RECT, should the function treat
that node as transparent and continue searching, or as opaque and return
(probably) NULL?

Instead, replace the function with one returning a scene_node, which
will allow for more consistent behavior across different node types.
Compositors can downcast scene_surface nodes via the now-public
wlr_scene_surface_from_node() if they need access to the surface itself.
This commit is contained in:
Devin J. Pohly 2021-08-28 14:14:16 -05:00 • committed by Simon Ser
parent b7cd06e8fa
commit 9ed16e39fa
2 changed files with 41 additions and 22 deletions
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13
include/wlr/types/wlr_scene.h
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@ -114,12 +114,13 @@ void wlr_scene_node_reparent(struct wlr_scene_node *node,
void wlr_scene_node_for_each_surface(struct wlr_scene_node *node,
wlr_surface_iterator_func_t iterator, void *user_data);
/**
* Find a surface in this scene-graph that accepts input events at the given
* layout-local coordinates. Returns the surface and coordinates relative to
* the returned surface, or NULL if no surface is found at that location.
* Find the topmost node in this scene-graph that contains the point at the
* given layout-local coordinates. (For surface nodes, this means accepting
* input events at that point.) Returns the node and coordinates relative to the
* returned node, or NULL if no node is found at that location.
*/
struct wlr_surface *wlr_scene_node_surface_at(struct wlr_scene_node *node,
double lx, double ly, double *sx, double *sy);
struct wlr_scene_node *wlr_scene_node_at(struct wlr_scene_node *node,
double lx, double ly, double *nx, double *ny);
/**
* Create a new scene-graph.
@ -142,6 +143,8 @@ void wlr_scene_render_output(struct wlr_scene *scene, struct wlr_output *output,
struct wlr_scene_surface *wlr_scene_surface_create(struct wlr_scene_node *parent,
struct wlr_surface *surface);
struct wlr_scene_surface *wlr_scene_surface_from_node(struct wlr_scene_node *node);
/**
* Add a node displaying a solid-colored rectangle to the scene-graph.
*/