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examples/scene-graph: demonstrate scene_rect node type 

Add RECT nodes to the scene-graph demo to illustrate how they are used.
Here, we add a solid rectangle behind each surface as a quick-and-dirty
border, handling surface.commit in order to size it appropriately.
This commit is contained in:
Devin J. Pohly 2021-08-13 15:35:19 -05:00 committed by Simon Ser
parent 9ed16e39fa
commit e2e68ff680
1 changed files with 22 additions and 1 deletions
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23
examples/scene-graph.c
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@ -20,6 +20,8 @@
*
* New surfaces are stacked on top of the existing ones as they appear. */
static const int border_width = 3;
struct server {
struct wl_display *display;
struct wlr_backend *backend;
@ -35,8 +37,10 @@ struct server {
struct surface {
struct wlr_surface *wlr;
struct wlr_scene_surface *scene_surface;
struct wlr_scene_rect *border;
struct wl_list link;
struct wl_listener commit;
struct wl_listener destroy;
};
@ -102,9 +106,17 @@ static void server_handle_new_output(struct wl_listener *listener, void *data) {
wlr_output_create_global(wlr_output);
}
static void surface_handle_commit(struct wl_listener *listener, void *data) {
struct surface *surface = wl_container_of(listener, surface, commit);
wlr_scene_rect_set_size(surface->border,
surface->wlr->current.width + 2 * border_width,
surface->wlr->current.height + 2 * border_width);
}
static void surface_handle_destroy(struct wl_listener *listener, void *data) {
struct surface *surface = wl_container_of(listener, surface, destroy);
wlr_scene_node_destroy(&surface->scene_surface->node);
wlr_scene_node_destroy(&surface->border->node);
wl_list_remove(&surface->destroy.link);
wl_list_remove(&surface->link);
free(surface);
@ -119,13 +131,22 @@ static void server_handle_new_surface(struct wl_listener *listener,
struct surface *surface = calloc(1, sizeof(struct surface));
surface->wlr = wlr_surface;
surface->commit.notify = surface_handle_commit;
wl_signal_add(&wlr_surface->events.commit, &surface->commit);
surface->destroy.notify = surface_handle_destroy;
wl_signal_add(&wlr_surface->events.destroy, &surface->destroy);
/* Border dimensions will be set in surface.commit handler */
surface->border = wlr_scene_rect_create(&server->scene->node,
0, 0, (float[4]){ 0.5f, 0.5f, 0.5f, 1 });
wlr_scene_node_set_position(&surface->border->node, pos, pos);
surface->scene_surface =
wlr_scene_surface_create(&server->scene->node, wlr_surface);
wl_list_insert(server->surfaces.prev, &surface->link);
wlr_scene_node_set_position(&surface->scene_surface->node, pos, pos);
wlr_scene_node_set_position(&surface->scene_surface->node,
pos + border_width, pos + border_width);
}
int main(int argc, char *argv[]) {