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wlr_scene: Introduce scene_nodes_in_box

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Will query the scene for all nodes that appear in the given wlr_box.
The nodes will be sent to the iterator from closest to farthest from the
eye.

Refactor wlr_scene_node_at to use this new function.
This commit is contained in:
Alexander Orzechowski 2022-08-11 03:14:14 -04:00
parent c2359d0321
commit 7f17774d18
1 changed files with 85 additions and 40 deletions
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125
types/scene/wlr_scene.c
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@ -195,6 +195,50 @@ struct wlr_scene_tree *wlr_scene_tree_create(struct wlr_scene_tree *parent) {
static void scene_node_get_size(struct wlr_scene_node *node, int *lx, int *ly);
typedef bool (*scene_node_box_iterator_func_t)(struct wlr_scene_node *node,
int sx, int sy, void *data);
static bool _scene_nodes_in_box(struct wlr_scene_node *node, struct wlr_box *box,
scene_node_box_iterator_func_t iterator, void *user_data, int lx, int ly) {
if (!node->enabled) {
return false;
}
switch (node->type) {
case WLR_SCENE_NODE_TREE:;
struct wlr_scene_tree *scene_tree = scene_tree_from_node(node);
struct wlr_scene_node *child;
wl_list_for_each_reverse(child, &scene_tree->children, link) {
if (_scene_nodes_in_box(child, box, iterator, user_data, lx + child->x, ly + child->y)) {
return true;
}
}
break;
case WLR_SCENE_NODE_RECT:
case WLR_SCENE_NODE_BUFFER:;
struct wlr_box node_box = { .x = lx, .y = ly };
scene_node_get_size(node, &node_box.width, &node_box.height);
bool intersects;
intersects = wlr_box_intersection(&node_box, &node_box, box);
if (intersects && iterator(node, lx, ly, user_data)) {
return true;
}
break;
}
return false;
}
static bool scene_nodes_in_box(struct wlr_scene_node *node, struct wlr_box *box,
scene_node_box_iterator_func_t iterator, void *user_data) {
int x, y;
wlr_scene_node_coords(node, &x, &y);
return _scene_nodes_in_box(node, box, iterator, user_data, x, y);
}
// This function must be called whenever the coordinates/dimensions of a scene
// buffer or scene output change. It is not necessary to call when a scene
// buffer's node is enabled/disabled or obscured by other nodes.
@ -745,55 +789,56 @@ void wlr_scene_node_for_each_buffer(struct wlr_scene_node *node,
scene_node_for_each_scene_buffer(node, 0, 0, user_iterator, user_data);
}
struct wlr_scene_node *wlr_scene_node_at(struct wlr_scene_node *node,
double lx, double ly, double *nx, double *ny) {
if (!node->enabled) {
return NULL;
}
struct node_at_data {
double lx, ly;
double rx, ry;
struct wlr_scene_node *node;
};
// TODO: optimize by storing a bounding box in each node?
lx -= node->x;
ly -= node->y;
static bool scene_node_at_iterator(struct wlr_scene_node *node,
int lx, int ly, void *data) {
struct node_at_data *at_data = data;
bool intersects = false;
switch (node->type) {
case WLR_SCENE_NODE_TREE:;
struct wlr_scene_tree *scene_tree = scene_tree_from_node(node);
struct wlr_scene_node *child;
wl_list_for_each_reverse(child, &scene_tree->children, link) {
struct wlr_scene_node *node =
wlr_scene_node_at(child, lx, ly, nx, ny);
if (node != NULL) {
return node;
}
}
break;
case WLR_SCENE_NODE_RECT:;
int width, height;
scene_node_get_size(node, &width, &height);
intersects = lx >= 0 && lx < width && ly >= 0 && ly < height;
break;
case WLR_SCENE_NODE_BUFFER:;
double rx = at_data->lx - lx;
double ry = at_data->ly - ly;
if (node->type == WLR_SCENE_NODE_BUFFER) {
struct wlr_scene_buffer *scene_buffer = wlr_scene_buffer_from_node(node);
if (scene_buffer->point_accepts_input) {
intersects = scene_buffer->point_accepts_input(scene_buffer, lx, ly);
} else {
int width, height;
scene_node_get_size(node, &width, &height);
intersects = lx >= 0 && lx < width && ly >= 0 && ly < height;
if (scene_buffer->point_accepts_input &&
!scene_buffer->point_accepts_input(scene_buffer, rx, ry)) {
return false;
}
break;
}
if (intersects) {
if (nx != NULL) {
*nx = lx;
at_data->rx = rx;
at_data->ry = ry;
at_data->node = node;
return true;
}
if (ny != NULL) {
*ny = ly;
struct wlr_scene_node *wlr_scene_node_at(struct wlr_scene_node *node,
double lx, double ly, double *nx, double *ny) {
struct wlr_box box = {
.x = floor(lx),
.y = floor(ly),
.width = 1,
.height = 1
};
struct node_at_data data = {
.lx = lx,
.ly = ly
};
if (scene_nodes_in_box(node, &box, scene_node_at_iterator, &data)) {
if (nx) {
*nx = data.rx;
}
return node;
if (ny) {
*ny = data.ry;
}
return data.node;
}
return NULL;