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#include <assert.h>
#include <stdbool.h>
#include <stdlib.h>
#include <wayland-server.h>
#include <wlr/types/wlr_box.h>
#include <wlr/types/wlr_surface.h>
#include <wlr/types/wlr_layer_shell.h>
#include <wlr/util/log.h>
#include "rootston/desktop.h"
#include "rootston/layers.h"
#include "rootston/output.h"
#include "rootston/server.h"
static void apply_exclusive(struct wlr_box *output_area,
uint32_t anchor, uint32_t exclusive) {
struct {
uint32_t anchors;
int *value;
int multiplier;
} edges[] = {
{
.anchors =
ZWLR_LAYER_SURFACE_V1_ANCHOR_LEFT |
ZWLR_LAYER_SURFACE_V1_ANCHOR_RIGHT |
ZWLR_LAYER_SURFACE_V1_ANCHOR_TOP,
.value = &output_area->y,
.multiplier = 1,
},
{
.anchors =
ZWLR_LAYER_SURFACE_V1_ANCHOR_LEFT |
ZWLR_LAYER_SURFACE_V1_ANCHOR_RIGHT |
ZWLR_LAYER_SURFACE_V1_ANCHOR_BOTTOM,
.value = &output_area->height,
.multiplier = -1,
},
{
.anchors =
ZWLR_LAYER_SURFACE_V1_ANCHOR_LEFT |
ZWLR_LAYER_SURFACE_V1_ANCHOR_TOP |
ZWLR_LAYER_SURFACE_V1_ANCHOR_BOTTOM,
.value = &output_area->x,
.multiplier = 1,
},
{
.anchors =
ZWLR_LAYER_SURFACE_V1_ANCHOR_RIGHT |
ZWLR_LAYER_SURFACE_V1_ANCHOR_TOP |
ZWLR_LAYER_SURFACE_V1_ANCHOR_BOTTOM,
.value = &output_area->width,
.multiplier = -1,
},
};
for (size_t i = 0; i < sizeof(edges) / sizeof(edges[0]); ++i) {
if ((anchor & edges[i].anchors)) {
*edges[i].value += exclusive * edges[i].multiplier;
}
}
}
static void arrange_layer(struct wlr_output *output, struct wl_list *list) {
struct wlr_box output_area = { .x = 0, .y = 0 };
wlr_output_effective_resolution(output,
&output_area.width, &output_area.height);
struct roots_layer_surface *roots_surface;
wl_list_for_each(roots_surface, list, link) {
struct wlr_layer_surface *layer = roots_surface->layer_surface;
struct wlr_layer_surface_state *state = &layer->current;
struct wlr_box box = { .width = state->width, .height = state->height };
// Horizontal axis
const uint32_t both_horiz = ZWLR_LAYER_SURFACE_V1_ANCHOR_LEFT
| ZWLR_LAYER_SURFACE_V1_ANCHOR_RIGHT;
if ((state->anchor & both_horiz) && box.width == -1) {
box.x = 0;
box.width = output_area.width;
} else if ((state->anchor & ZWLR_LAYER_SURFACE_V1_ANCHOR_LEFT)) {
box.x = output_area.x;
} else if ((state->anchor & ZWLR_LAYER_SURFACE_V1_ANCHOR_RIGHT)) {
box.x = output_area.width - box.width;
} else {
box.x = (output_area.width / 2) - (box.width / 2);
}
// Vertical axis
const uint32_t both_vert = ZWLR_LAYER_SURFACE_V1_ANCHOR_TOP
| ZWLR_LAYER_SURFACE_V1_ANCHOR_BOTTOM;
if ((state->anchor & both_vert) && box.height == -1) {
box.y = 0;
box.height = output_area.height;
} else if ((state->anchor & ZWLR_LAYER_SURFACE_V1_ANCHOR_TOP)) {
box.y = output_area.y;
} else if ((state->anchor & ZWLR_LAYER_SURFACE_V1_ANCHOR_BOTTOM)) {
box.y = output_area.height - box.height;
} else {
box.y = (output_area.height / 2) - (box.height / 2);
}
wlr_log(L_DEBUG, "arranged layer at %dx%d@%d,%d",
box.width, box.height, box.x, box.y);
roots_surface->geo = box;
apply_exclusive(&output_area, state->anchor, state->exclusive_zone);
if (box.width != (int)state->width
|| box.height != (int)state->height
|| !roots_surface->configured) {
wlr_layer_surface_configure(layer, box.width, box.height);
roots_surface->configured = true;
}
}
}
static void arrange_layers(struct wlr_output *_output) {
struct roots_output *output = _output->data;
size_t layers = sizeof(output->layers) / sizeof(output->layers[0]);
for (size_t i = 0; i < layers; ++i) {
arrange_layer(output->wlr_output, &output->layers[i]);
}
}
static void handle_output_destroy(struct wl_listener *listener, void *data) {
struct roots_layer_surface *layer =
wl_container_of(listener, layer, output_destroy);
layer->layer_surface->output = NULL;
wl_resource_destroy(layer->layer_surface->resource);
}
static void handle_surface_commit(struct wl_listener *listener, void *data) {
struct roots_layer_surface *layer =
wl_container_of(listener, layer, surface_commit);
struct wlr_layer_surface *layer_surface = layer->layer_surface;
struct wlr_output *wlr_output = layer_surface->output;
if (wlr_output != NULL) {
struct roots_output *output = wlr_output->data;
output_damage_from_local_surface(output, layer_surface->surface,
layer->geo.x, layer->geo.y, 0);
}
}
static void unmap(struct wlr_layer_surface *layer_surface) {
struct roots_layer_surface *layer = layer_surface->data;
wl_list_remove(&layer->link);
struct wlr_output *wlr_output = layer_surface->output;
if (wlr_output != NULL) {
struct roots_output *output = wlr_output->data;
wlr_output_damage_add_box(output->damage, &layer->geo);
}
}
static void handle_destroy(struct wl_listener *listener, void *data) {
struct roots_layer_surface *layer = wl_container_of(
listener, layer, destroy);
if (layer->layer_surface->mapped) {
unmap(layer->layer_surface);
}
wl_list_remove(&layer->output_destroy.link);
free(layer);
}
static void handle_map(struct wl_listener *listener, void *data) {
struct wlr_layer_surface *layer_surface = data;
struct roots_layer_surface *layer = layer_surface->data;
struct wlr_output *wlr_output = layer_surface->output;
struct roots_output *output = wlr_output->data;
wlr_output_damage_add_box(output->damage, &layer->geo);
}
static void handle_unmap(struct wl_listener *listener, void *data) {
struct roots_layer_surface *layer = wl_container_of(
listener, layer, unmap);
unmap(layer->layer_surface);
}
void handle_layer_shell_surface(struct wl_listener *listener, void *data) {
struct wlr_layer_surface *layer_surface = data;
struct roots_desktop *desktop =
wl_container_of(listener, desktop, layer_shell_surface);
wlr_log(L_DEBUG, "new layer surface: namespace %s layer %d anchor %d %dx%d %d,%d,%d,%d",
layer_surface->namespace, layer_surface->layer, layer_surface->layer,
layer_surface->client_pending.width,
layer_surface->client_pending.height,
layer_surface->client_pending.margin.top,
layer_surface->client_pending.margin.right,
layer_surface->client_pending.margin.bottom,
layer_surface->client_pending.margin.left);
struct roots_layer_surface *roots_surface =
calloc(1, sizeof(struct roots_layer_surface));
if (!roots_surface) {
return;
}
roots_surface->surface_commit.notify = handle_surface_commit;
wl_signal_add(&layer_surface->surface->events.commit,
&roots_surface->surface_commit);
roots_surface->output_destroy.notify = handle_output_destroy;
wl_signal_add(&layer_surface->output->events.destroy,
&roots_surface->output_destroy);
roots_surface->destroy.notify = handle_destroy;
wl_signal_add(&layer_surface->events.destroy, &roots_surface->destroy);
roots_surface->map.notify = handle_map;
wl_signal_add(&layer_surface->events.map, &roots_surface->map);
roots_surface->unmap.notify = handle_unmap;
wl_signal_add(&layer_surface->events.unmap, &roots_surface->unmap);
roots_surface->layer_surface = layer_surface;
layer_surface->data = roots_surface;
struct roots_output *output = layer_surface->output->data;
wl_list_insert(&output->layers[layer_surface->layer], &roots_surface->link);
// Temporarily set the layer's current state to client_pending
// So that we can easily arrange it
struct wlr_layer_surface_state old_state = layer_surface->current;
layer_surface->current = layer_surface->client_pending;
arrange_layers(output->wlr_output);
layer_surface->current = old_state;
}
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