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#include <assert.h>
#include <stdlib.h>
#include <wlr/types/wlr_scene.h>
#include <wlr/types/wlr_subcompositor.h>
#include <wlr/util/addon.h>
/**
* A tree for a surface and all of its child sub-surfaces.
*
* `tree` contains `scene_surface` and one node per sub-surface.
*/
struct wlr_scene_subsurface_tree {
struct wlr_scene_tree *tree;
struct wlr_surface *surface;
struct wlr_scene_surface *scene_surface;
struct wl_listener tree_destroy;
struct wl_listener surface_destroy;
struct wl_listener surface_commit;
struct wl_listener surface_new_subsurface;
struct wlr_scene_subsurface_tree *parent; // NULL for the top-level surface
// Only valid if the surface is a sub-surface
struct wlr_addon surface_addon;
struct wl_listener subsurface_destroy;
struct wl_listener subsurface_map;
struct wl_listener subsurface_unmap;
};
static void subsurface_tree_handle_tree_destroy(struct wl_listener *listener,
void *data) {
struct wlr_scene_subsurface_tree *subsurface_tree =
wl_container_of(listener, subsurface_tree, tree_destroy);
// tree and scene_surface will be cleaned up by scene_node_finish
if (subsurface_tree->parent) {
wlr_addon_finish(&subsurface_tree->surface_addon);
wl_list_remove(&subsurface_tree->subsurface_destroy.link);
wl_list_remove(&subsurface_tree->subsurface_map.link);
wl_list_remove(&subsurface_tree->subsurface_unmap.link);
}
wl_list_remove(&subsurface_tree->tree_destroy.link);
wl_list_remove(&subsurface_tree->surface_destroy.link);
wl_list_remove(&subsurface_tree->surface_commit.link);
wl_list_remove(&subsurface_tree->surface_new_subsurface.link);
free(subsurface_tree);
}
static const struct wlr_addon_interface subsurface_tree_addon_impl;
static struct wlr_scene_subsurface_tree *subsurface_tree_from_subsurface(
struct wlr_scene_subsurface_tree *parent,
struct wlr_subsurface *subsurface) {
struct wlr_addon *addon = wlr_addon_find(&subsurface->surface->addons,
parent, &subsurface_tree_addon_impl);
assert(addon != NULL);
struct wlr_scene_subsurface_tree *subsurface_tree =
wl_container_of(addon, subsurface_tree, surface_addon);
return subsurface_tree;
}
static void subsurface_tree_reconfigure(
struct wlr_scene_subsurface_tree *subsurface_tree) {
struct wlr_surface *surface = subsurface_tree->surface;
struct wlr_scene_node *prev = NULL;
struct wlr_subsurface *subsurface;
wl_list_for_each(subsurface, &surface->current.subsurfaces_below,
current.link) {
struct wlr_scene_subsurface_tree *child =
subsurface_tree_from_subsurface(subsurface_tree, subsurface);
if (prev != NULL) {
wlr_scene_node_place_above(&child->tree->node, prev);
}
prev = &child->tree->node;
wlr_scene_node_set_position(&child->tree->node,
subsurface->current.x, subsurface->current.y);
}
if (prev != NULL) {
wlr_scene_node_place_above(&subsurface_tree->scene_surface->buffer->node, prev);
}
prev = &subsurface_tree->scene_surface->buffer->node;
wl_list_for_each(subsurface, &surface->current.subsurfaces_above,
current.link) {
struct wlr_scene_subsurface_tree *child =
subsurface_tree_from_subsurface(subsurface_tree, subsurface);
wlr_scene_node_place_above(&child->tree->node, prev);
prev = &child->tree->node;
wlr_scene_node_set_position(&child->tree->node,
subsurface->current.x, subsurface->current.y);
}
}
static void subsurface_tree_handle_surface_destroy(struct wl_listener *listener,
void *data) {
struct wlr_scene_subsurface_tree *subsurface_tree =
wl_container_of(listener, subsurface_tree, surface_destroy);
wlr_scene_node_destroy(&subsurface_tree->tree->node);
}
static void subsurface_tree_handle_surface_commit(struct wl_listener *listener,
void *data) {
struct wlr_scene_subsurface_tree *subsurface_tree =
wl_container_of(listener, subsurface_tree, surface_commit);
// TODO: only do this on subsurface order or position change
subsurface_tree_reconfigure(subsurface_tree);
}
static void subsurface_tree_handle_subsurface_destroy(struct wl_listener *listener,
void *data) {
struct wlr_scene_subsurface_tree *subsurface_tree =
wl_container_of(listener, subsurface_tree, subsurface_destroy);
wlr_scene_node_destroy(&subsurface_tree->tree->node);
}
static void subsurface_tree_handle_subsurface_map(struct wl_listener *listener,
void *data) {
struct wlr_scene_subsurface_tree *subsurface_tree =
wl_container_of(listener, subsurface_tree, subsurface_map);
wlr_scene_node_set_enabled(&subsurface_tree->tree->node, true);
}
static void subsurface_tree_handle_subsurface_unmap(struct wl_listener *listener,
void *data) {
struct wlr_scene_subsurface_tree *subsurface_tree =
wl_container_of(listener, subsurface_tree, subsurface_unmap);
wlr_scene_node_set_enabled(&subsurface_tree->tree->node, false);
}
static void subsurface_tree_addon_destroy(struct wlr_addon *addon) {
struct wlr_scene_subsurface_tree *subsurface_tree =
wl_container_of(addon, subsurface_tree, surface_addon);
wlr_scene_node_destroy(&subsurface_tree->tree->node);
}
static const struct wlr_addon_interface subsurface_tree_addon_impl = {
.name = "wlr_scene_subsurface_tree",
.destroy = subsurface_tree_addon_destroy,
};
static struct wlr_scene_subsurface_tree *scene_surface_tree_create(
struct wlr_scene_tree *parent, struct wlr_surface *surface);
static bool subsurface_tree_create_subsurface(
struct wlr_scene_subsurface_tree *parent,
struct wlr_subsurface *subsurface) {
struct wlr_scene_subsurface_tree *child = scene_surface_tree_create(
parent->tree, subsurface->surface);
if (child == NULL) {
return false;
}
child->parent = parent;
wlr_scene_node_set_enabled(&child->tree->node, subsurface->mapped);
wlr_addon_init(&child->surface_addon, &subsurface->surface->addons,
parent, &subsurface_tree_addon_impl);
child->subsurface_destroy.notify = subsurface_tree_handle_subsurface_destroy;
wl_signal_add(&subsurface->events.destroy, &child->subsurface_destroy);
child->subsurface_map.notify = subsurface_tree_handle_subsurface_map;
wl_signal_add(&subsurface->events.map, &child->subsurface_map);
child->subsurface_unmap.notify = subsurface_tree_handle_subsurface_unmap;
wl_signal_add(&subsurface->events.unmap, &child->subsurface_unmap);
return true;
}
static void subsurface_tree_handle_surface_new_subsurface(
struct wl_listener *listener, void *data) {
struct wlr_scene_subsurface_tree *subsurface_tree =
wl_container_of(listener, subsurface_tree, surface_new_subsurface);
struct wlr_subsurface *subsurface = data;
if (!subsurface_tree_create_subsurface(subsurface_tree, subsurface)) {
wl_resource_post_no_memory(subsurface->resource);
}
}
static struct wlr_scene_subsurface_tree *scene_surface_tree_create(
struct wlr_scene_tree *parent, struct wlr_surface *surface) {
struct wlr_scene_subsurface_tree *subsurface_tree =
calloc(1, sizeof(*subsurface_tree));
if (subsurface_tree == NULL) {
return NULL;
}
subsurface_tree->tree = wlr_scene_tree_create(parent);
if (subsurface_tree->tree == NULL) {
goto error_surface_tree;
}
subsurface_tree->scene_surface =
wlr_scene_surface_create(subsurface_tree->tree, surface);
if (subsurface_tree->scene_surface == NULL) {
goto error_scene_surface;
}
subsurface_tree->surface = surface;
struct wlr_subsurface *subsurface;
wl_list_for_each(subsurface, &surface->current.subsurfaces_below,
current.link) {
if (!subsurface_tree_create_subsurface(subsurface_tree, subsurface)) {
goto error_scene_surface;
}
}
wl_list_for_each(subsurface, &surface->current.subsurfaces_above,
current.link) {
if (!subsurface_tree_create_subsurface(subsurface_tree, subsurface)) {
goto error_scene_surface;
}
}
subsurface_tree_reconfigure(subsurface_tree);
subsurface_tree->tree_destroy.notify = subsurface_tree_handle_tree_destroy;
wl_signal_add(&subsurface_tree->tree->node.events.destroy,
&subsurface_tree->tree_destroy);
subsurface_tree->surface_destroy.notify = subsurface_tree_handle_surface_destroy;
wl_signal_add(&surface->events.destroy, &subsurface_tree->surface_destroy);
subsurface_tree->surface_commit.notify = subsurface_tree_handle_surface_commit;
wl_signal_add(&surface->events.commit, &subsurface_tree->surface_commit);
subsurface_tree->surface_new_subsurface.notify =
subsurface_tree_handle_surface_new_subsurface;
wl_signal_add(&surface->events.new_subsurface,
&subsurface_tree->surface_new_subsurface);
return subsurface_tree;
error_scene_surface:
wlr_scene_node_destroy(&subsurface_tree->tree->node);
error_surface_tree:
free(subsurface_tree);
return NULL;
}
struct wlr_scene_tree *wlr_scene_subsurface_tree_create(
struct wlr_scene_tree *parent, struct wlr_surface *surface) {
struct wlr_scene_subsurface_tree *subsurface_tree =
scene_surface_tree_create(parent, surface);
if (subsurface_tree == NULL) {
return NULL;
}
return subsurface_tree->tree;
}
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