swayfx/sway/desktop/output.c

829 lines
24 KiB
C
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#define _POSIX_C_SOURCE 200809L
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#include <assert.h>
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#include <stdlib.h>
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#include <strings.h>
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#include <time.h>
#include <wayland-server.h>
#include <wlr/render/wlr_renderer.h>
#include <wlr/types/wlr_box.h>
#include <wlr/types/wlr_matrix.h>
#include <wlr/types/wlr_output_damage.h>
#include <wlr/types/wlr_output_layout.h>
#include <wlr/types/wlr_output.h>
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#include <wlr/types/wlr_surface.h>
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#include <wlr/types/wlr_wl_shell.h>
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#include <wlr/util/region.h>
#include "log.h"
#include "sway/input/input-manager.h"
#include "sway/input/seat.h"
#include "sway/layers.h"
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#include "sway/output.h"
#include "sway/server.h"
#include "sway/tree/arrange.h"
#include "sway/tree/container.h"
#include "sway/tree/layout.h"
#include "sway/tree/view.h"
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#include "sway/tree/workspace.h"
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struct sway_container *output_by_name(const char *name) {
for (int i = 0; i < root_container.children->length; ++i) {
struct sway_container *output = root_container.children->items[i];
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if (strcasecmp(output->name, name) == 0) {
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return output;
}
}
return NULL;
}
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/**
* Rotate a child's position relative to a parent. The parent size is (pw, ph),
* the child position is (*sx, *sy) and its size is (sw, sh).
*/
static void rotate_child_position(double *sx, double *sy, double sw, double sh,
double pw, double ph, float rotation) {
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if (rotation == 0.0f) {
return;
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}
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// Coordinates relative to the center of the subsurface
double ox = *sx - pw/2 + sw/2,
oy = *sy - ph/2 + sh/2;
// Rotated coordinates
double rx = cos(-rotation)*ox - sin(-rotation)*oy,
ry = cos(-rotation)*oy + sin(-rotation)*ox;
*sx = rx + pw/2 - sw/2;
*sy = ry + ph/2 - sh/2;
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}
/**
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* Contains a surface's root geometry information. For instance, when rendering
* a popup, this will contain the parent view's position and size.
*/
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struct root_geometry {
double x, y;
int width, height;
float rotation;
};
static bool get_surface_box(struct root_geometry *geo,
struct sway_output *output, struct wlr_surface *surface, int sx, int sy,
struct wlr_box *surface_box) {
if (!wlr_surface_has_buffer(surface)) {
return false;
}
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int sw = surface->current->width;
int sh = surface->current->height;
double _sx = sx, _sy = sy;
rotate_child_position(&_sx, &_sy, sw, sh, geo->width, geo->height,
geo->rotation);
struct wlr_box box = {
.x = geo->x + _sx,
.y = geo->y + _sy,
.width = sw,
.height = sh,
};
if (surface_box != NULL) {
memcpy(surface_box, &box, sizeof(struct wlr_box));
}
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struct wlr_box rotated_box;
wlr_box_rotated_bounds(&box, geo->rotation, &rotated_box);
struct wlr_box output_box = {
.width = output->swayc->width,
.height = output->swayc->height,
};
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struct wlr_box intersection;
return wlr_box_intersection(&output_box, &rotated_box, &intersection);
}
static void surface_for_each_surface(struct wlr_surface *surface,
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double ox, double oy, struct root_geometry *geo,
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wlr_surface_iterator_func_t iterator, void *user_data) {
geo->x = ox;
geo->y = oy;
geo->width = surface->current->width;
geo->height = surface->current->height;
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geo->rotation = 0;
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wlr_surface_for_each_surface(surface, iterator, user_data);
}
static void output_view_for_each_surface(struct sway_view *view,
struct root_geometry *geo, wlr_surface_iterator_func_t iterator,
void *user_data) {
geo->x = view->x;
geo->y = view->y;
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geo->width = view->surface->current->width;
geo->height = view->surface->current->height;
geo->rotation = 0; // TODO
view_for_each_surface(view, iterator, user_data);
}
static void layer_for_each_surface(struct wl_list *layer_surfaces,
struct root_geometry *geo, wlr_surface_iterator_func_t iterator,
void *user_data) {
struct sway_layer_surface *layer_surface;
wl_list_for_each(layer_surface, layer_surfaces, link) {
struct wlr_layer_surface *wlr_layer_surface =
layer_surface->layer_surface;
surface_for_each_surface(wlr_layer_surface->surface,
layer_surface->geo.x, layer_surface->geo.y, geo, iterator,
user_data);
}
}
static void unmanaged_for_each_surface(struct wl_list *unmanaged,
struct sway_output *output, struct root_geometry *geo,
wlr_surface_iterator_func_t iterator, void *user_data) {
struct sway_xwayland_unmanaged *unmanaged_surface;
wl_list_for_each(unmanaged_surface, unmanaged, link) {
struct wlr_xwayland_surface *xsurface =
unmanaged_surface->wlr_xwayland_surface;
double ox = unmanaged_surface->lx - output->swayc->x;
double oy = unmanaged_surface->ly - output->swayc->y;
surface_for_each_surface(xsurface->surface, ox, oy, geo,
iterator, user_data);
}
}
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static void scale_box(struct wlr_box *box, float scale) {
box->x *= scale;
box->y *= scale;
box->width *= scale;
box->height *= scale;
}
struct render_data {
struct root_geometry root_geo;
struct sway_output *output;
float alpha;
};
static void render_surface_iterator(struct wlr_surface *surface, int sx, int sy,
void *_data) {
struct render_data *data = _data;
struct wlr_output *wlr_output = data->output->wlr_output;
float rotation = data->root_geo.rotation;
float alpha = data->alpha;
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if (!wlr_surface_has_buffer(surface)) {
return;
}
struct wlr_box box;
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bool intersects = get_surface_box(&data->root_geo, data->output, surface,
sx, sy, &box);
if (!intersects) {
return;
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}
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struct wlr_renderer *renderer =
wlr_backend_get_renderer(wlr_output->backend);
if (!sway_assert(renderer != NULL,
"expected the output backend to have a renderer")) {
return;
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}
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scale_box(&box, wlr_output->scale);
float matrix[9];
enum wl_output_transform transform =
wlr_output_transform_invert(surface->current->transform);
wlr_matrix_project_box(matrix, &box, transform, rotation,
wlr_output->transform_matrix);
wlr_render_texture_with_matrix(renderer, surface->texture,
matrix, alpha);
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}
static void render_layer(struct sway_output *output,
struct wl_list *layer_surfaces) {
struct render_data data = { .output = output, .alpha = 1.0f };
layer_for_each_surface(layer_surfaces, &data.root_geo,
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render_surface_iterator, &data);
}
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static void render_unmanaged(struct sway_output *output,
struct wl_list *unmanaged) {
struct render_data data = { .output = output, .alpha = 1.0f };
unmanaged_for_each_surface(unmanaged, output, &data.root_geo,
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render_surface_iterator, &data);
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}
static void render_view(struct sway_view *view, struct sway_output *output) {
struct render_data data = { .output = output, .alpha = view->swayc->alpha };
output_view_for_each_surface(
view, &data.root_geo, render_surface_iterator, &data);
}
/**
* Render decorations for a view with "border normal".
*/
static void render_container_simple_border_normal(struct sway_output *output,
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struct sway_container *con, struct border_colors *colors,
struct wlr_texture *title_texture) {
struct wlr_renderer *renderer =
wlr_backend_get_renderer(output->wlr_output->backend);
struct wlr_box box;
float color[4];
// Child border - left edge
memcpy(&color, colors->child_border, sizeof(float) * 4);
color[3] *= con->alpha;
box.x = con->x;
box.y = con->y + 1;
box.width = con->sway_view->border_thickness;
box.height = con->height - 1;
scale_box(&box, output->wlr_output->scale);
wlr_render_rect(renderer, &box, color,
output->wlr_output->transform_matrix);
// Child border - right edge
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if (con->parent->children->length == 1 && con->parent->layout == L_HORIZ) {
memcpy(&color, colors->indicator, sizeof(float) * 4);
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} else {
memcpy(&color, colors->child_border, sizeof(float) * 4);
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}
color[3] *= con->alpha;
box.x = con->x + con->width - con->sway_view->border_thickness;
box.y = con->y + 1;
box.width = con->sway_view->border_thickness;
box.height = con->height - 1;
scale_box(&box, output->wlr_output->scale);
wlr_render_rect(renderer, &box, color,
output->wlr_output->transform_matrix);
// Child border - bottom edge
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if (con->parent->children->length == 1 && con->parent->layout == L_VERT) {
memcpy(&color, colors->indicator, sizeof(float) * 4);
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} else {
memcpy(&color, colors->child_border, sizeof(float) * 4);
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}
color[3] *= con->alpha;
box.x = con->x;
box.y = con->y + con->height - con->sway_view->border_thickness;
box.width = con->width;
box.height = con->sway_view->border_thickness;
scale_box(&box, output->wlr_output->scale);
wlr_render_rect(renderer, &box, color,
output->wlr_output->transform_matrix);
// Single pixel bar above title
memcpy(&color, colors->border, sizeof(float) * 4);
color[3] *= con->alpha;
box.x = con->x;
box.y = con->y;
box.width = con->width;
box.height = 1;
scale_box(&box, output->wlr_output->scale);
wlr_render_rect(renderer, &box, color,
output->wlr_output->transform_matrix);
// Single pixel bar below title
box.x = con->x + con->sway_view->border_thickness;
box.y = con->sway_view->y - 1;
box.width = con->width - con->sway_view->border_thickness * 2;
box.height = 1;
scale_box(&box, output->wlr_output->scale);
wlr_render_rect(renderer, &box, color,
output->wlr_output->transform_matrix);
// Title background
memcpy(&color, colors->background, sizeof(float) * 4);
color[3] *= con->alpha;
box.x = con->x + con->sway_view->border_thickness;
box.y = con->y + 1;
box.width = con->width - con->sway_view->border_thickness * 2;
box.height = con->sway_view->y - con->y - 2;
scale_box(&box, output->wlr_output->scale);
wlr_render_rect(renderer, &box, color,
output->wlr_output->transform_matrix);
// Title text
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if (title_texture) {
struct wlr_box scissor_box;
wlr_box_transform(&box,
wlr_output_transform_invert(output->wlr_output->transform),
output->swayc->width, output->swayc->height, &scissor_box);
wlr_renderer_scissor(renderer, &scissor_box);
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wlr_render_texture(renderer, title_texture,
output->wlr_output->transform_matrix, box.x, box.y, 1);
wlr_renderer_scissor(renderer, NULL);
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}
}
/**
* Render decorations for a view with "border pixel".
*/
static void render_container_simple_border_pixel(struct sway_output *output,
struct sway_container *con, struct border_colors *colors) {
struct wlr_renderer *renderer =
wlr_backend_get_renderer(output->wlr_output->backend);
struct wlr_box box;
float color[4];
// Child border - left edge
memcpy(&color, colors->child_border, sizeof(float) * 4);
color[3] *= con->alpha;
box.x = con->x;
box.y = con->y;
box.width = con->sway_view->border_thickness;
box.height = con->height;
scale_box(&box, output->wlr_output->scale);
wlr_render_rect(renderer, &box, color,
output->wlr_output->transform_matrix);
// Child border - right edge
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if (con->parent->children->length == 1 && con->parent->layout == L_HORIZ) {
memcpy(&color, colors->indicator, sizeof(float) * 4);
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} else {
memcpy(&color, colors->child_border, sizeof(float) * 4);
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}
color[3] *= con->alpha;
box.x = con->x + con->width - con->sway_view->border_thickness;
box.y = con->y;
box.width = con->sway_view->border_thickness;
box.height = con->height;
scale_box(&box, output->wlr_output->scale);
wlr_render_rect(renderer, &box, color,
output->wlr_output->transform_matrix);
// Child border - top edge
box.x = con->x;
box.y = con->y;
box.width = con->width;
box.height = con->sway_view->border_thickness;
scale_box(&box, output->wlr_output->scale);
wlr_render_rect(renderer, &box, color,
output->wlr_output->transform_matrix);
// Child border - bottom edge
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if (con->parent->children->length == 1 && con->parent->layout == L_VERT) {
memcpy(&color, colors->indicator, sizeof(float) * 4);
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} else {
memcpy(&color, colors->child_border, sizeof(float) * 4);
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}
color[3] *= con->alpha;
box.x = con->x;
box.y = con->y + con->height - con->sway_view->border_thickness;
box.width = con->width;
box.height = con->sway_view->border_thickness;
scale_box(&box, output->wlr_output->scale);
wlr_render_rect(renderer, &box, color,
output->wlr_output->transform_matrix);
}
static void render_container(struct sway_output *output,
struct sway_container *con);
/**
* Render a container's children using a L_HORIZ or L_VERT layout.
*
* Wrap child views in borders and leave child containers borderless because
* they'll apply their own borders to their children.
*/
static void render_container_simple(struct sway_output *output,
struct sway_container *con) {
struct sway_seat *seat = input_manager_current_seat(input_manager);
struct sway_container *focus = seat_get_focus(seat);
for (int i = 0; i < con->children->length; ++i) {
struct sway_container *child = con->children->items[i];
if (child->type == C_VIEW) {
if (child->sway_view->border != B_NONE) {
struct border_colors *colors;
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struct wlr_texture *title_texture;
if (focus == child) {
colors = &config->border_colors.focused;
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title_texture = child->title_focused;
} else if (seat_get_focus_inactive(seat, con) == child) {
colors = &config->border_colors.focused_inactive;
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title_texture = child->title_focused_inactive;
} else {
colors = &config->border_colors.unfocused;
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title_texture = child->title_unfocused;
}
if (child->sway_view->border == B_NORMAL) {
render_container_simple_border_normal(output, child,
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colors, title_texture);
} else {
render_container_simple_border_pixel(output, child, colors);
}
}
render_view(child->sway_view, output);
} else {
render_container(output, child);
}
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}
}
/**
* Render a container's children using the L_TABBED layout.
*/
static void render_container_tabbed(struct sway_output *output,
struct sway_container *con) {
// TODO
}
/**
* Render a container's children using the L_STACKED layout.
*/
static void render_container_stacked(struct sway_output *output,
struct sway_container *con) {
// TODO
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}
static void render_container(struct sway_output *output,
struct sway_container *con) {
switch (con->layout) {
case L_NONE:
case L_HORIZ:
case L_VERT:
render_container_simple(output, con);
break;
case L_STACKED:
render_container_stacked(output, con);
break;
case L_TABBED:
render_container_tabbed(output, con);
break;
case L_FLOATING:
// TODO
break;
}
}
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static struct sway_container *output_get_active_workspace(
struct sway_output *output) {
struct sway_seat *seat = input_manager_current_seat(input_manager);
struct sway_container *focus =
seat_get_focus_inactive(seat, output->swayc);
if (!focus) {
// We've never been to this output before
focus = output->swayc->children->items[0];
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}
struct sway_container *workspace = focus;
if (workspace->type != C_WORKSPACE) {
workspace = container_parent(workspace, C_WORKSPACE);
}
return workspace;
}
static void render_output(struct sway_output *output, struct timespec *when,
pixman_region32_t *damage) {
struct wlr_output *wlr_output = output->wlr_output;
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struct wlr_renderer *renderer =
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wlr_backend_get_renderer(wlr_output->backend);
if (!sway_assert(renderer != NULL,
"expected the output backend to have a renderer")) {
return;
}
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wlr_renderer_begin(renderer, wlr_output->width, wlr_output->height);
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if (!pixman_region32_not_empty(damage)) {
// Output isn't damaged but needs buffer swap
goto renderer_end;
}
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// TODO: don't damage the whole output
int width, height;
wlr_output_transformed_resolution(wlr_output, &width, &height);
pixman_region32_union_rect(damage, damage, 0, 0, width, height);
struct sway_container *workspace = output_get_active_workspace(output);
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if (workspace->sway_workspace->fullscreen) {
float clear_color[] = {0.0f, 0.0f, 0.0f, 1.0f};
wlr_renderer_clear(renderer, clear_color);
// TODO: handle views smaller than the output
render_view(workspace->sway_workspace->fullscreen, output);
if (workspace->sway_workspace->fullscreen->type == SWAY_VIEW_XWAYLAND) {
render_unmanaged(output,
&root_container.sway_root->xwayland_unmanaged);
}
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} else {
float clear_color[] = {0.25f, 0.25f, 0.25f, 1.0f};
wlr_renderer_clear(renderer, clear_color);
render_layer(output,
&output->layers[ZWLR_LAYER_SHELL_V1_LAYER_BACKGROUND]);
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render_layer(output, &output->layers[ZWLR_LAYER_SHELL_V1_LAYER_BOTTOM]);
render_container(output, workspace);
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render_unmanaged(output, &root_container.sway_root->xwayland_unmanaged);
render_layer(output, &output->layers[ZWLR_LAYER_SHELL_V1_LAYER_TOP]);
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}
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render_layer(output, &output->layers[ZWLR_LAYER_SHELL_V1_LAYER_OVERLAY]);
renderer_end:
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if (root_container.sway_root->debug_tree) {
wlr_render_texture(renderer, root_container.sway_root->debug_tree,
wlr_output->transform_matrix, 0, 0, 1);
}
wlr_renderer_end(renderer);
if (!wlr_output_damage_swap_buffers(output->damage, when, damage)) {
return;
}
output->last_frame = *when;
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}
struct send_frame_done_data {
struct root_geometry root_geo;
struct sway_output *output;
struct timespec *when;
};
static void send_frame_done_iterator(struct wlr_surface *surface,
int sx, int sy, void *_data) {
struct send_frame_done_data *data = _data;
bool intersects = get_surface_box(&data->root_geo, data->output, surface,
sx, sy, NULL);
if (intersects) {
wlr_surface_send_frame_done(surface, data->when);
}
}
static void send_frame_done_layer(struct send_frame_done_data *data,
struct wl_list *layer_surfaces) {
layer_for_each_surface(layer_surfaces, &data->root_geo,
send_frame_done_iterator, data);
}
static void send_frame_done_unmanaged(struct send_frame_done_data *data,
struct wl_list *unmanaged) {
unmanaged_for_each_surface(unmanaged, data->output, &data->root_geo,
send_frame_done_iterator, data);
}
static void send_frame_done_container_iterator(struct sway_container *con,
void *_data) {
struct send_frame_done_data *data = _data;
if (!sway_assert(con->type == C_VIEW, "expected a view")) {
return;
}
output_view_for_each_surface(con->sway_view, &data->root_geo,
send_frame_done_iterator, data);
}
static void send_frame_done_container(struct send_frame_done_data *data,
struct sway_container *con) {
container_descendants(con, C_VIEW,
send_frame_done_container_iterator, data);
}
static void send_frame_done(struct sway_output *output, struct timespec *when) {
struct send_frame_done_data data = {
.output = output,
.when = when,
};
send_frame_done_layer(&data,
&output->layers[ZWLR_LAYER_SHELL_V1_LAYER_BACKGROUND]);
send_frame_done_layer(&data,
&output->layers[ZWLR_LAYER_SHELL_V1_LAYER_BOTTOM]);
struct sway_container *workspace = output_get_active_workspace(output);
send_frame_done_container(&data, workspace);
send_frame_done_unmanaged(&data,
&root_container.sway_root->xwayland_unmanaged);
send_frame_done_layer(&data,
&output->layers[ZWLR_LAYER_SHELL_V1_LAYER_TOP]);
send_frame_done_layer(&data,
&output->layers[ZWLR_LAYER_SHELL_V1_LAYER_OVERLAY]);
}
static void damage_handle_frame(struct wl_listener *listener, void *data) {
struct sway_output *output =
wl_container_of(listener, output, damage_frame);
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if (!output->wlr_output->enabled) {
return;
}
struct timespec now;
clock_gettime(CLOCK_MONOTONIC, &now);
bool needs_swap;
pixman_region32_t damage;
pixman_region32_init(&damage);
if (!wlr_output_damage_make_current(output->damage, &needs_swap, &damage)) {
return;
}
if (needs_swap) {
render_output(output, &now, &damage);
}
pixman_region32_fini(&damage);
// Send frame done to all visible surfaces
send_frame_done(output, &now);
}
void output_damage_whole(struct sway_output *output) {
wlr_output_damage_add_whole(output->damage);
}
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struct damage_data {
struct root_geometry root_geo;
struct sway_output *output;
bool whole;
};
static void damage_surface_iterator(struct wlr_surface *surface, int sx, int sy,
void *_data) {
struct damage_data *data = _data;
struct sway_output *output = data->output;
float rotation = data->root_geo.rotation;
bool whole = data->whole;
struct wlr_box box;
bool intersects = get_surface_box(&data->root_geo, data->output, surface,
sx, sy, &box);
if (!intersects) {
return;
}
scale_box(&box, output->wlr_output->scale);
if (whole) {
wlr_box_rotated_bounds(&box, rotation, &box);
wlr_output_damage_add_box(output->damage, &box);
} else {
int center_x = box.x + box.width/2;
int center_y = box.y + box.height/2;
pixman_region32_t damage;
pixman_region32_init(&damage);
pixman_region32_copy(&damage, &surface->current->surface_damage);
wlr_region_scale(&damage, &damage, output->wlr_output->scale);
if (ceil(output->wlr_output->scale) > surface->current->scale) {
// When scaling up a surface, it'll become blurry so we need to
// expand the damage region
wlr_region_expand(&damage, &damage,
ceil(output->wlr_output->scale) - surface->current->scale);
}
pixman_region32_translate(&damage, box.x, box.y);
wlr_region_rotated_bounds(&damage, &damage, rotation,
center_x, center_y);
wlr_output_damage_add(output->damage, &damage);
pixman_region32_fini(&damage);
}
}
void output_damage_surface(struct sway_output *output, double ox, double oy,
struct wlr_surface *surface, bool whole) {
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struct damage_data data = {
.output = output,
.whole = whole,
};
surface_for_each_surface(surface, ox, oy, &data.root_geo,
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damage_surface_iterator, &data);
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}
void output_damage_view(struct sway_output *output, struct sway_view *view,
bool whole) {
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if (!sway_assert(view->swayc != NULL, "expected a view in the tree")) {
return;
}
struct sway_container *workspace = container_parent(view->swayc,
C_WORKSPACE);
if (workspace->sway_workspace->fullscreen && !view->is_fullscreen) {
return;
}
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struct damage_data data = {
.output = output,
.whole = whole,
};
output_view_for_each_surface(view, &data.root_geo,
damage_surface_iterator, &data);
}
static void output_damage_whole_container_iterator(struct sway_container *con,
void *data) {
struct sway_output *output = data;
if (!sway_assert(con->type == C_VIEW, "expected a view")) {
return;
}
output_damage_view(output, con->sway_view, true);
}
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void output_damage_whole_container(struct sway_output *output,
struct sway_container *con) {
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float scale = output->wlr_output->scale;
struct wlr_box box = {
.x = con->x * scale,
.y = con->y * scale,
.width = con->width * scale,
.height = con->height * scale,
};
wlr_output_damage_add_box(output->damage, &box);
container_descendants(con, C_VIEW, output_damage_whole_container_iterator,
output);
}
static void damage_handle_destroy(struct wl_listener *listener, void *data) {
struct sway_output *output =
wl_container_of(listener, output, damage_destroy);
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container_destroy(output->swayc);
}
static void handle_destroy(struct wl_listener *listener, void *data) {
struct sway_output *output = wl_container_of(listener, output, destroy);
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container_destroy(output->swayc);
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}
static void handle_mode(struct wl_listener *listener, void *data) {
struct sway_output *output = wl_container_of(listener, output, mode);
arrange_layers(output);
arrange_output(output->swayc);
}
static void handle_transform(struct wl_listener *listener, void *data) {
struct sway_output *output = wl_container_of(listener, output, transform);
arrange_layers(output);
arrange_output(output->swayc);
}
static void handle_scale(struct wl_listener *listener, void *data) {
struct sway_output *output = wl_container_of(listener, output, scale);
arrange_layers(output);
arrange_output(output->swayc);
}
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void handle_new_output(struct wl_listener *listener, void *data) {
struct sway_server *server = wl_container_of(listener, server, new_output);
struct wlr_output *wlr_output = data;
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wlr_log(L_DEBUG, "New output %p: %s", wlr_output, wlr_output->name);
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struct sway_output *output = calloc(1, sizeof(struct sway_output));
if (!output) {
return;
}
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output->wlr_output = wlr_output;
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wlr_output->data = output;
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output->server = server;
if (!wl_list_empty(&wlr_output->modes)) {
struct wlr_output_mode *mode =
wl_container_of(wlr_output->modes.prev, mode, link);
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wlr_output_set_mode(wlr_output, mode);
}
output->damage = wlr_output_damage_create(wlr_output);
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output->swayc = output_create(output);
if (!output->swayc) {
free(output);
return;
}
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size_t len = sizeof(output->layers) / sizeof(output->layers[0]);
for (size_t i = 0; i < len; ++i) {
wl_list_init(&output->layers[i]);
}
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input_manager_configure_xcursor(input_manager);
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wl_signal_add(&wlr_output->events.destroy, &output->destroy);
output->destroy.notify = handle_destroy;
wl_signal_add(&wlr_output->events.mode, &output->mode);
output->mode.notify = handle_mode;
wl_signal_add(&wlr_output->events.transform, &output->transform);
output->transform.notify = handle_transform;
wl_signal_add(&wlr_output->events.scale, &output->scale);
output->scale.notify = handle_scale;
wl_signal_add(&output->damage->events.frame, &output->damage_frame);
output->damage_frame.notify = damage_handle_frame;
wl_signal_add(&output->damage->events.destroy, &output->damage_destroy);
output->damage_destroy.notify = damage_handle_destroy;
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arrange_layers(output);
arrange_root();
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}