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#include <assert.h>
#include <stdlib.h>
#include <stdio.h>
#include <wlr/interfaces/wlr_output.h>
#include <wlr/types/wlr_output_layer.h>
#include <wlr/util/log.h>
#include "backend/headless.h"
static const uint32_t SUPPORTED_OUTPUT_STATE =
WLR_OUTPUT_STATE_BACKEND_OPTIONAL |
WLR_OUTPUT_STATE_BUFFER |
WLR_OUTPUT_STATE_ENABLED |
WLR_OUTPUT_STATE_MODE;
static size_t last_output_num = 0;
static struct wlr_headless_output *headless_output_from_output(
struct wlr_output *wlr_output) {
assert(wlr_output_is_headless(wlr_output));
struct wlr_headless_output *output = wl_container_of(wlr_output, output, wlr_output);
return output;
}
static bool output_set_custom_mode(struct wlr_headless_output *output,
int32_t width, int32_t height, int32_t refresh) {
if (refresh <= 0) {
refresh = HEADLESS_DEFAULT_REFRESH;
}
output->frame_delay = 1000000 / refresh;
return true;
}
static bool output_test(struct wlr_output *wlr_output,
const struct wlr_output_state *state) {
uint32_t unsupported = state->committed & ~SUPPORTED_OUTPUT_STATE;
if (unsupported != 0) {
wlr_log(WLR_DEBUG, "Unsupported output state fields: 0x%"PRIx32,
unsupported);
return false;
}
if (state->committed & WLR_OUTPUT_STATE_MODE) {
assert(state->mode_type == WLR_OUTPUT_STATE_MODE_CUSTOM);
}
if (state->committed & WLR_OUTPUT_STATE_LAYERS) {
for (size_t i = 0; i < state->layers_len; i++) {
state->layers[i].accepted = true;
}
}
return true;
}
static bool output_commit(struct wlr_output *wlr_output,
const struct wlr_output_state *state) {
struct wlr_headless_output *output =
headless_output_from_output(wlr_output);
if (!output_test(wlr_output, state)) {
return false;
}
if (state->committed & WLR_OUTPUT_STATE_MODE) {
if (!output_set_custom_mode(output,
state->custom_mode.width,
state->custom_mode.height,
state->custom_mode.refresh)) {
return false;
}
}
if (state->committed & WLR_OUTPUT_STATE_BUFFER) {
struct wlr_output_event_present present_event = {
.commit_seq = wlr_output->commit_seq + 1,
.presented = true,
};
wlr_output_send_present(wlr_output, &present_event);
wl_event_source_timer_update(output->frame_timer, output->frame_delay);
}
return true;
}
static void output_destroy(struct wlr_output *wlr_output) {
struct wlr_headless_output *output =
headless_output_from_output(wlr_output);
wl_list_remove(&output->link);
wl_event_source_remove(output->frame_timer);
free(output);
}
static const struct wlr_output_impl output_impl = {
.destroy = output_destroy,
.commit = output_commit,
};
bool wlr_output_is_headless(struct wlr_output *wlr_output) {
return wlr_output->impl == &output_impl;
}
static int signal_frame(void *data) {
struct wlr_headless_output *output = data;
wlr_output_send_frame(&output->wlr_output);
return 0;
}
struct wlr_output *wlr_headless_add_output(struct wlr_backend *wlr_backend,
unsigned int width, unsigned int height) {
struct wlr_headless_backend *backend =
headless_backend_from_backend(wlr_backend);
struct wlr_headless_output *output =
calloc(1, sizeof(struct wlr_headless_output));
if (output == NULL) {
wlr_log(WLR_ERROR, "Failed to allocate wlr_headless_output");
return NULL;
}
output->backend = backend;
wlr_output_init(&output->wlr_output, &backend->backend, &output_impl,
backend->display, NULL);
struct wlr_output *wlr_output = &output->wlr_output;
output_set_custom_mode(output, width, height, 0);
size_t output_num = ++last_output_num;
char name[64];
snprintf(name, sizeof(name), "HEADLESS-%zu", output_num);
wlr_output_set_name(wlr_output, name);
char description[128];
snprintf(description, sizeof(description), "Headless output %zu", output_num);
wlr_output_set_description(wlr_output, description);
struct wl_event_loop *ev = wl_display_get_event_loop(backend->display);
output->frame_timer = wl_event_loop_add_timer(ev, signal_frame, output);
wl_list_insert(&backend->outputs, &output->link);
if (backend->started) {
wl_signal_emit_mutable(&backend->backend.events.new_output, wlr_output);
}
return wlr_output;
}
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