wlroots/types/wlr_screenshooter.c

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#include <assert.h>
#include <stdlib.h>
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#include <string.h>
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#include <wayland-server.h>
#include <wlr/backend.h>
#include <wlr/render/wlr_renderer.h>
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#include <wlr/types/wlr_output.h>
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#include <wlr/types/wlr_screenshooter.h>
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#include <wlr/util/log.h>
#include "screenshooter-protocol.h"
#include "util/signal.h"
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static struct wlr_screenshot *screenshot_from_resource(
struct wl_resource *resource) {
assert(wl_resource_instance_of(resource, &orbital_screenshot_interface,
NULL));
return wl_resource_get_user_data(resource);
}
struct screenshot_state {
struct wl_shm_buffer *shm_buffer;
struct wlr_screenshot *screenshot;
struct wl_listener frame_listener;
};
static void screenshot_destroy(struct wlr_screenshot *screenshot) {
wl_list_remove(&screenshot->link);
wl_resource_set_user_data(screenshot->resource, NULL);
free(screenshot);
}
static void handle_screenshot_resource_destroy(
struct wl_resource *screenshot_resource) {
struct wlr_screenshot *screenshot =
screenshot_from_resource(screenshot_resource);
if (screenshot != NULL) {
screenshot_destroy(screenshot);
}
}
static void output_handle_frame(struct wl_listener *listener, void *_data) {
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struct screenshot_state *state = wl_container_of(listener, state,
frame_listener);
struct wlr_output *output = state->screenshot->output;
struct wlr_renderer *renderer = wlr_backend_get_renderer(output->backend);
struct wl_shm_buffer *shm_buffer = state->shm_buffer;
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if (!(output->pending.committed & WLR_OUTPUT_STATE_BUFFER)) {
return;
}
enum wl_shm_format format = wl_shm_buffer_get_format(shm_buffer);
int32_t width = wl_shm_buffer_get_width(shm_buffer);
int32_t height = wl_shm_buffer_get_height(shm_buffer);
int32_t stride = wl_shm_buffer_get_stride(shm_buffer);
wl_shm_buffer_begin_access(shm_buffer);
void *data = wl_shm_buffer_get_data(shm_buffer);
bool ok = wlr_renderer_read_pixels(renderer, format, NULL, stride,
width, height, 0, 0, 0, 0, data);
wl_shm_buffer_end_access(shm_buffer);
if (!ok) {
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wlr_log(WLR_ERROR, "Cannot read pixels");
goto cleanup;
}
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orbital_screenshot_send_done(state->screenshot->resource);
cleanup:
wl_list_remove(&listener->link);
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free(state);
}
static const struct orbital_screenshooter_interface screenshooter_impl;
static struct wlr_screenshooter *screenshooter_from_resource(
struct wl_resource *resource) {
assert(wl_resource_instance_of(resource, &orbital_screenshooter_interface,
&screenshooter_impl));
return wl_resource_get_user_data(resource);
}
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static void screenshooter_shoot(struct wl_client *client,
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struct wl_resource *screenshooter_resource, uint32_t id,
struct wl_resource *output_resource,
struct wl_resource *buffer_resource) {
struct wlr_screenshooter *screenshooter =
screenshooter_from_resource(screenshooter_resource);
struct wlr_output *output = wlr_output_from_resource(output_resource);
struct wlr_renderer *renderer = wlr_backend_get_renderer(output->backend);
if (renderer == NULL) {
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wlr_log(WLR_ERROR, "Backend doesn't have a renderer");
return;
}
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struct wl_shm_buffer *shm_buffer = wl_shm_buffer_get(buffer_resource);
if (shm_buffer == NULL) {
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wlr_log(WLR_ERROR, "Invalid buffer: not a shared memory buffer");
return;
}
int32_t width = wl_shm_buffer_get_width(shm_buffer);
int32_t height = wl_shm_buffer_get_height(shm_buffer);
if (width < output->width || height < output->height) {
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wlr_log(WLR_ERROR, "Invalid buffer: too small");
return;
}
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uint32_t format = wl_shm_buffer_get_format(shm_buffer);
if (!wlr_renderer_format_supported(renderer, format)) {
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wlr_log(WLR_ERROR, "Invalid buffer: unsupported format");
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return;
}
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struct wlr_screenshot *screenshot =
calloc(1, sizeof(struct wlr_screenshot));
if (!screenshot) {
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wl_resource_post_no_memory(screenshooter_resource);
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return;
}
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screenshot->output_resource = output_resource;
screenshot->output = output;
screenshot->screenshooter = screenshooter;
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screenshot->resource = wl_resource_create(client,
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&orbital_screenshot_interface,
wl_resource_get_version(screenshooter_resource), id);
if (screenshot->resource == NULL) {
free(screenshot);
wl_resource_post_no_memory(screenshooter_resource);
return;
}
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wl_resource_set_implementation(screenshot->resource, NULL, screenshot,
handle_screenshot_resource_destroy);
wl_list_insert(&screenshooter->screenshots, &screenshot->link);
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wlr_log(WLR_DEBUG, "new screenshot %p (res %p)", screenshot,
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screenshot->resource);
struct screenshot_state *state = calloc(1, sizeof(struct screenshot_state));
if (!state) {
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wl_resource_destroy(screenshot->resource);
free(screenshot);
wl_resource_post_no_memory(screenshooter_resource);
return;
}
state->shm_buffer = shm_buffer;
state->screenshot = screenshot;
state->frame_listener.notify = output_handle_frame;
wl_signal_add(&output->events.precommit, &state->frame_listener);
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// Schedule a buffer commit
output->needs_frame = true;
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wlr_output_schedule_frame(output);
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}
static const struct orbital_screenshooter_interface screenshooter_impl = {
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.shoot = screenshooter_shoot,
};
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static void screenshooter_bind(struct wl_client *wl_client, void *data,
uint32_t version, uint32_t id) {
struct wlr_screenshooter *screenshooter = data;
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assert(wl_client && screenshooter);
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struct wl_resource *wl_resource = wl_resource_create(wl_client,
&orbital_screenshooter_interface, version, id);
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if (wl_resource == NULL) {
wl_client_post_no_memory(wl_client);
return;
}
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wl_resource_set_implementation(wl_resource, &screenshooter_impl,
screenshooter, NULL);
}
void wlr_screenshooter_destroy(struct wlr_screenshooter *screenshooter) {
if (!screenshooter) {
return;
}
wl_list_remove(&screenshooter->display_destroy.link);
struct wlr_screenshot *screenshot, *tmp;
wl_list_for_each_safe(screenshot, tmp, &screenshooter->screenshots, link) {
screenshot_destroy(screenshot);
}
wlr_signal_emit_safe(&screenshooter->events.destroy, screenshooter);
wl_global_destroy(screenshooter->global);
free(screenshooter);
}
static void handle_display_destroy(struct wl_listener *listener, void *data) {
struct wlr_screenshooter *screenshooter =
wl_container_of(listener, screenshooter, display_destroy);
wlr_screenshooter_destroy(screenshooter);
}
struct wlr_screenshooter *wlr_screenshooter_create(struct wl_display *display) {
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struct wlr_screenshooter *screenshooter =
calloc(1, sizeof(struct wlr_screenshooter));
if (!screenshooter) {
return NULL;
}
wl_list_init(&screenshooter->screenshots);
wl_signal_init(&screenshooter->events.destroy);
screenshooter->display_destroy.notify = handle_display_destroy;
wl_display_add_destroy_listener(display, &screenshooter->display_destroy);
screenshooter->global = wl_global_create(display,
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&orbital_screenshooter_interface, 1, screenshooter, screenshooter_bind);
if (screenshooter->global == NULL) {
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free(screenshooter);
return NULL;
}
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return screenshooter;
}