scene: add wlr_scene_node_surface_at
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501b29db03
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@ -97,6 +97,13 @@ void wlr_scene_node_place_below(struct wlr_scene_node *node,
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*/
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void wlr_scene_node_for_each_surface(struct wlr_scene_node *node,
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wlr_surface_iterator_func_t iterator, void *user_data);
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/**
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* Find a surface in this scene-graph that accepts input events at the given
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* layout-local coordinates. Returns the surface and coordinates relative to
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* the returned surface, or NULL if no surface is found at that location.
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*/
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struct wlr_surface *wlr_scene_node_surface_at(struct wlr_scene_node *node,
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double lx, double ly, double *sx, double *sy);
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/**
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* Create a new scene-graph.
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@ -159,6 +159,41 @@ void wlr_scene_node_for_each_surface(struct wlr_scene_node *node,
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scene_node_for_each_surface(node, 0, 0, user_iterator, user_data);
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}
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struct wlr_surface *wlr_scene_node_surface_at(struct wlr_scene_node *node,
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double lx, double ly, double *sx, double *sy) {
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if (!node->state.enabled) {
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return NULL;
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}
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// TODO: optimize by storing a bounding box in each node?
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lx -= node->state.x;
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ly -= node->state.y;
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struct wlr_scene_node *child;
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wl_list_for_each_reverse(child, &node->state.children, state.link) {
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struct wlr_surface *surface =
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wlr_scene_node_surface_at(child, lx, ly, sx, sy);
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if (surface != NULL) {
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return surface;
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}
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}
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if (node->type == WLR_SCENE_NODE_SURFACE) {
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struct wlr_scene_surface *scene_surface = scene_surface_from_node(node);
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if (wlr_surface_point_accepts_input(scene_surface->surface, lx, ly)) {
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if (sx != NULL) {
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*sx = lx;
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}
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if (sy != NULL) {
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*sy = ly;
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}
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return scene_surface->surface;
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}
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}
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return NULL;
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}
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static int scale_length(int length, int offset, float scale) {
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return round((offset + length) * scale) - round(offset * scale);
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}
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