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#include <stdlib.h>
#include <wlr/types/wlr_scene.h>
#include <wlr/types/wlr_layer_shell_v1.h>
static void scene_layer_surface_handle_tree_destroy(
struct wl_listener *listener, void *data) {
struct wlr_scene_layer_surface_v1 *scene_layer_surface =
wl_container_of(listener, scene_layer_surface, tree_destroy);
// tree and surface_node will be cleaned up by scene_node_finish
wl_list_remove(&scene_layer_surface->tree_destroy.link);
wl_list_remove(&scene_layer_surface->layer_surface_destroy.link);
free(scene_layer_surface);
}
static void scene_layer_surface_handle_layer_surface_destroy(
struct wl_listener *listener, void *data) {
struct wlr_scene_layer_surface_v1 *scene_layer_surface =
wl_container_of(listener, scene_layer_surface, layer_surface_destroy);
wlr_scene_node_destroy(&scene_layer_surface->tree->node);
}
static void layer_surface_exclusive_zone(
struct wlr_layer_surface_v1_state *state,
struct wlr_box *usable_area) {
switch (state->anchor) {
case ZWLR_LAYER_SURFACE_V1_ANCHOR_TOP:
case (ZWLR_LAYER_SURFACE_V1_ANCHOR_TOP |
ZWLR_LAYER_SURFACE_V1_ANCHOR_LEFT |
ZWLR_LAYER_SURFACE_V1_ANCHOR_RIGHT):
// Anchor top
usable_area->y += state->exclusive_zone + state->margin.top;
usable_area->height -= state->exclusive_zone + state->margin.top;
break;
case ZWLR_LAYER_SURFACE_V1_ANCHOR_BOTTOM:
case (ZWLR_LAYER_SURFACE_V1_ANCHOR_BOTTOM |
ZWLR_LAYER_SURFACE_V1_ANCHOR_LEFT |
ZWLR_LAYER_SURFACE_V1_ANCHOR_RIGHT):
// Anchor bottom
usable_area->height -= state->exclusive_zone + state->margin.bottom;
break;
case ZWLR_LAYER_SURFACE_V1_ANCHOR_LEFT:
case (ZWLR_LAYER_SURFACE_V1_ANCHOR_TOP |
ZWLR_LAYER_SURFACE_V1_ANCHOR_BOTTOM |
ZWLR_LAYER_SURFACE_V1_ANCHOR_LEFT):
// Anchor left
usable_area->x += state->exclusive_zone + state->margin.left;
usable_area->width -= state->exclusive_zone + state->margin.left;
break;
case ZWLR_LAYER_SURFACE_V1_ANCHOR_RIGHT:
case (ZWLR_LAYER_SURFACE_V1_ANCHOR_TOP |
ZWLR_LAYER_SURFACE_V1_ANCHOR_BOTTOM |
ZWLR_LAYER_SURFACE_V1_ANCHOR_RIGHT):
// Anchor right
usable_area->width -= state->exclusive_zone + state->margin.right;
break;
}
if (usable_area->width < 0) {
usable_area->width = 0;
}
if (usable_area->height < 0) {
usable_area->height = 0;
}
}
void wlr_scene_layer_surface_v1_configure(
struct wlr_scene_layer_surface_v1 *scene_layer_surface,
const struct wlr_box *full_area, struct wlr_box *usable_area) {
struct wlr_layer_surface_v1 *layer_surface =
scene_layer_surface->layer_surface;
struct wlr_layer_surface_v1_state *state = &layer_surface->current;
// If the exclusive zone is set to -1, the layer surface will use the
// full area of the output, otherwise it is constrained to the
// remaining usable area.
struct wlr_box bounds;
if (state->exclusive_zone == -1) {
bounds = *full_area;
} else {
bounds = *usable_area;
}
struct wlr_box box = {
.width = state->desired_width,
.height = state->desired_height,
};
// Horizontal positioning
if (box.width == 0) {
box.x = bounds.x + state->margin.left;
box.width = bounds.width -
(state->margin.left + state->margin.right);
} else if (state->anchor & ZWLR_LAYER_SURFACE_V1_ANCHOR_LEFT &&
state->anchor & ZWLR_LAYER_SURFACE_V1_ANCHOR_RIGHT) {
box.x = bounds.x + bounds.width/2 -box.width/2;
} else if (state->anchor & ZWLR_LAYER_SURFACE_V1_ANCHOR_LEFT) {
box.x = bounds.x + state->margin.left;
} else if (state->anchor & ZWLR_LAYER_SURFACE_V1_ANCHOR_RIGHT) {
box.x = bounds.x + bounds.width - box.width - state->margin.right;
} else {
box.x = bounds.x + bounds.width/2 - box.width/2;
}
// Vertical positioning
if (box.height == 0) {
box.y = bounds.y + state->margin.top;
box.height = bounds.height -
(state->margin.top + state->margin.bottom);
} else if (state->anchor & ZWLR_LAYER_SURFACE_V1_ANCHOR_TOP &&
state->anchor & ZWLR_LAYER_SURFACE_V1_ANCHOR_BOTTOM) {
box.y = bounds.y + bounds.height/2 - box.height/2;
} else if (state->anchor & ZWLR_LAYER_SURFACE_V1_ANCHOR_TOP) {
box.y = bounds.y + state->margin.top;
} else if (state->anchor & ZWLR_LAYER_SURFACE_V1_ANCHOR_BOTTOM) {
box.y = bounds.y + bounds.height - box.height - state->margin.bottom;
} else {
box.y = bounds.y + bounds.height/2 - box.height/2;
}
wlr_scene_node_set_position(&scene_layer_surface->tree->node, box.x, box.y);
wlr_layer_surface_v1_configure(layer_surface, box.width, box.height);
if (layer_surface->surface->mapped && state->exclusive_zone > 0) {
layer_surface_exclusive_zone(state, usable_area);
}
}
struct wlr_scene_layer_surface_v1 *wlr_scene_layer_surface_v1_create(
struct wlr_scene_tree *parent,
struct wlr_layer_surface_v1 *layer_surface) {
struct wlr_scene_layer_surface_v1 *scene_layer_surface =
calloc(1, sizeof(*scene_layer_surface));
if (scene_layer_surface == NULL) {
return NULL;
}
scene_layer_surface->layer_surface = layer_surface;
scene_layer_surface->tree = wlr_scene_tree_create(parent);
if (scene_layer_surface->tree == NULL) {
free(scene_layer_surface);
return NULL;
}
struct wlr_scene_tree *surface_tree = wlr_scene_subsurface_tree_create(
scene_layer_surface->tree, layer_surface->surface);
if (surface_tree == NULL) {
wlr_scene_node_destroy(&scene_layer_surface->tree->node);
free(scene_layer_surface);
return NULL;
}
scene_layer_surface->tree_destroy.notify =
scene_layer_surface_handle_tree_destroy;
wl_signal_add(&scene_layer_surface->tree->node.events.destroy,
&scene_layer_surface->tree_destroy);
scene_layer_surface->layer_surface_destroy.notify =
scene_layer_surface_handle_layer_surface_destroy;
wl_signal_add(&layer_surface->events.destroy,
&scene_layer_surface->layer_surface_destroy);
return scene_layer_surface;
}
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