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scene: replace surface_at() with node_at() 

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
View File

@ -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.
*/

50
types/wlr_scene.c
View File

@ -13,7 +13,7 @@ static struct wlr_scene *scene_root_from_node(struct wlr_scene_node *node) {
return (struct wlr_scene *)node;
}
static struct wlr_scene_surface *scene_surface_from_node(
struct wlr_scene_surface *wlr_scene_surface_from_node(
struct wlr_scene_node *node) {
assert(node->type == WLR_SCENE_NODE_SURFACE);
return (struct wlr_scene_surface *)node;
@ -74,7 +74,7 @@ void wlr_scene_node_destroy(struct wlr_scene_node *node) {
free(scene);
break;
case WLR_SCENE_NODE_SURFACE:;
struct wlr_scene_surface *scene_surface = scene_surface_from_node(node);
struct wlr_scene_surface *scene_surface = wlr_scene_surface_from_node(node);
wl_list_remove(&scene_surface->surface_destroy.link);
free(scene_surface);
break;
@ -198,7 +198,7 @@ static void scene_node_for_each_surface(struct wlr_scene_node *node,
ly += node->state.y;
if (node->type == WLR_SCENE_NODE_SURFACE) {
struct wlr_scene_surface *scene_surface = scene_surface_from_node(node);
struct wlr_scene_surface *scene_surface = wlr_scene_surface_from_node(node);
user_iterator(scene_surface->surface, lx, ly, user_data);
}
@ -213,8 +213,8 @@ 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) {
struct wlr_scene_node *wlr_scene_node_at(struct wlr_scene_node *node,
double lx, double ly, double *nx, double *ny) {
if (!node->state.enabled) {
return NULL;
}
@ -225,24 +225,40 @@ struct wlr_surface *wlr_scene_node_surface_at(struct wlr_scene_node *node,
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;
struct wlr_scene_node *node =
wlr_scene_node_at(child, lx, ly, nx, ny);
if (node != NULL) {
return node;
}
}
if (node->type == WLR_SCENE_NODE_SURFACE) {
struct wlr_scene_surface *scene_surface = scene_surface_from_node(node);
switch (node->type) {
case WLR_SCENE_NODE_SURFACE:;
struct wlr_scene_surface *scene_surface = wlr_scene_surface_from_node(node);
if (wlr_surface_point_accepts_input(scene_surface->surface, lx, ly)) {
if (sx != NULL) {
*sx = lx;
if (nx != NULL) {
*nx = lx;
}
if (sy != NULL) {
*sy = ly;
if (ny != NULL) {
*ny = ly;
}
return scene_surface->surface;
return &scene_surface->node;
}
break;
case WLR_SCENE_NODE_RECT:;
struct wlr_scene_rect *rect = scene_rect_from_node(node);
if (lx >= 0 && lx < rect->width && ly >= 0 && ly < rect->height) {
if (nx != NULL) {
*nx = lx;
}
if (ny != NULL) {
*ny = ly;
}
return &rect->node;
}
break;
default:
break;
}
return NULL;
@ -342,7 +358,7 @@ static void render_node_iterator(struct wlr_scene_node *node,
/* Root node has nothing to render itself */
break;
case WLR_SCENE_NODE_SURFACE:;
struct wlr_scene_surface *scene_surface = scene_surface_from_node(node);
struct wlr_scene_surface *scene_surface = wlr_scene_surface_from_node(node);
struct wlr_surface *surface = scene_surface->surface;
struct wlr_texture *texture = wlr_surface_get_texture(surface);