wlroots-hyprland/backend/headless/backend.c

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#include <assert.h>
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#include <stdlib.h>
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#include <wlr/interfaces/wlr_output.h>
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#include <wlr/util/log.h>
#include "backend/headless.h"
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struct wlr_headless_backend *headless_backend_from_backend(
struct wlr_backend *wlr_backend) {
assert(wlr_backend_is_headless(wlr_backend));
struct wlr_headless_backend *backend = wl_container_of(wlr_backend, backend, backend);
return backend;
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}
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static bool backend_start(struct wlr_backend *wlr_backend) {
struct wlr_headless_backend *backend =
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headless_backend_from_backend(wlr_backend);
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wlr_log(WLR_INFO, "Starting headless backend");
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struct wlr_headless_output *output;
wl_list_for_each(output, &backend->outputs, link) {
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wl_signal_emit_mutable(&backend->backend.events.new_output,
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&output->wlr_output);
}
backend->started = true;
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return true;
}
static void backend_destroy(struct wlr_backend *wlr_backend) {
struct wlr_headless_backend *backend =
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headless_backend_from_backend(wlr_backend);
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if (!wlr_backend) {
return;
}
wlr_backend_finish(wlr_backend);
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struct wlr_headless_output *output, *output_tmp;
wl_list_for_each_safe(output, output_tmp, &backend->outputs, link) {
wlr_output_destroy(&output->wlr_output);
}
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wl_list_remove(&backend->display_destroy.link);
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free(backend);
}
static uint32_t get_buffer_caps(struct wlr_backend *wlr_backend) {
return WLR_BUFFER_CAP_DATA_PTR
| WLR_BUFFER_CAP_DMABUF
| WLR_BUFFER_CAP_SHM;
}
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static const struct wlr_backend_impl backend_impl = {
.start = backend_start,
.destroy = backend_destroy,
.get_buffer_caps = get_buffer_caps,
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};
static void handle_display_destroy(struct wl_listener *listener, void *data) {
struct wlr_headless_backend *backend =
wl_container_of(listener, backend, display_destroy);
backend_destroy(&backend->backend);
}
struct wlr_backend *wlr_headless_backend_create(struct wl_display *display) {
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wlr_log(WLR_INFO, "Creating headless backend");
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struct wlr_headless_backend *backend = calloc(1, sizeof(*backend));
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if (!backend) {
wlr_log(WLR_ERROR, "Failed to allocate wlr_headless_backend");
return NULL;
}
wlr_backend_init(&backend->backend, &backend_impl);
backend->display = display;
wl_list_init(&backend->outputs);
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backend->display_destroy.notify = handle_display_destroy;
wl_display_add_destroy_listener(display, &backend->display_destroy);
return &backend->backend;
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}
bool wlr_backend_is_headless(struct wlr_backend *backend) {
return backend->impl == &backend_impl;
}