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scene: add wlr_scene_node_surface_at

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This commit is contained in:
Simon Ser 2021-08-10 11:26:34 +02:00
parent 501b29db03
commit e4d0ec9ee1
2 changed files with 42 additions and 0 deletions
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7
include/wlr/types/wlr_scene.h
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@ -97,6 +97,13 @@ void wlr_scene_node_place_below(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.
*/
struct wlr_surface *wlr_scene_node_surface_at(struct wlr_scene_node *node,
double lx, double ly, double *sx, double *sy);
/**
* Create a new scene-graph.

35
types/wlr_scene.c
View file

@ -159,6 +159,41 @@ void wlr_scene_node_for_each_surface(struct wlr_scene_node *node,
scene_node_for_each_surface(node, 0, 0, user_iterator, user_data);
}
struct wlr_surface *wlr_scene_node_surface_at(struct wlr_scene_node *node,
double lx, double ly, double *sx, double *sy) {
if (!node->state.enabled) {
return NULL;
}
// TODO: optimize by storing a bounding box in each node?
lx -= node->state.x;
ly -= node->state.y;
struct wlr_scene_node *child;
wl_list_for_each_reverse(child, &node->state.children, state.link) {
struct wlr_surface *surface =
wlr_scene_node_surface_at(child, lx, ly, sx, sy);
if (surface != NULL) {
return surface;
}
}
if (node->type == WLR_SCENE_NODE_SURFACE) {
struct wlr_scene_surface *scene_surface = scene_surface_from_node(node);
if (wlr_surface_point_accepts_input(scene_surface->surface, lx, ly)) {
if (sx != NULL) {
*sx = lx;
}
if (sy != NULL) {
*sy = ly;
}
return scene_surface->surface;
}
}
return NULL;
}
static int scale_length(int length, int offset, float scale) {
return round((offset + length) * scale) - round(offset * scale);
}