wlroots/examples/screenshot.c

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/*
* Copyright © 2008 Kristian Høgsberg
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
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#define _POSIX_C_SOURCE 200112L
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
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#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/param.h>
#include <sys/wait.h>
#include <unistd.h>
#include <wayland-client.h>
#include "screenshooter-client-protocol.h"
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static struct wl_shm *shm = NULL;
static struct orbital_screenshooter *screenshooter = NULL;
static struct wl_list output_list;
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static bool buffer_copy_done;
struct screenshooter_output {
struct wl_output *output;
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int width, height;
struct wl_list link;
};
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static void output_handle_geometry(void *data, struct wl_output *wl_output,
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int x, int y, int physical_width, int physical_height, int subpixel,
const char *make, const char *model, int transform) {
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// No-op
}
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static void output_handle_mode(void *data, struct wl_output *wl_output,
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uint32_t flags, int width, int height, int refresh) {
struct screenshooter_output *output = wl_output_get_user_data(wl_output);
if (wl_output == output->output && (flags & WL_OUTPUT_MODE_CURRENT)) {
output->width = width;
output->height = height;
}
}
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static void output_handle_done(void *data, struct wl_output *wl_output) {
// No-op
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}
static const struct wl_output_listener output_listener = {
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.geometry = output_handle_geometry,
.mode = output_handle_mode,
.done = output_handle_done,
};
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static void screenshot_done(void *data, struct orbital_screenshot *screenshot) {
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buffer_copy_done = true;
}
static const struct orbital_screenshot_listener screenshot_listener = {
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.done = screenshot_done,
};
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static void handle_global(void *data, struct wl_registry *registry,
uint32_t name, const char *interface, uint32_t version) {
static struct screenshooter_output *output;
if (strcmp(interface, "wl_output") == 0) {
output = calloc(1, sizeof(*output));
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output->output = wl_registry_bind(registry, name, &wl_output_interface,
1);
wl_list_insert(&output_list, &output->link);
wl_output_add_listener(output->output, &output_listener, output);
} else if (strcmp(interface, "wl_shm") == 0) {
shm = wl_registry_bind(registry, name, &wl_shm_interface, 1);
} else if (strcmp(interface, "orbital_screenshooter") == 0) {
screenshooter = wl_registry_bind(registry, name,
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&orbital_screenshooter_interface, 1);
}
}
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static void handle_global_remove(void *data, struct wl_registry *registry,
uint32_t name) {
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// Who cares?
}
static const struct wl_registry_listener registry_listener = {
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.global = handle_global,
.global_remove = handle_global_remove,
};
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static struct wl_buffer *create_shm_buffer(int width, int height,
void **data_out) {
int stride = width * 4;
int size = stride * height;
const char shm_name[] = "/wlroots-screenshot";
int fd = shm_open(shm_name, O_RDWR | O_CREAT | O_EXCL, 0);
if (fd < 0) {
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fprintf(stderr, "shm_open failed\n");
return NULL;
}
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shm_unlink(shm_name);
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int ret;
while ((ret = ftruncate(fd, size)) == EINTR) {
// No-op
}
if (ret < 0) {
close(fd);
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fprintf(stderr, "ftruncate failed\n");
return NULL;
}
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void *data = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
if (data == MAP_FAILED) {
fprintf(stderr, "mmap failed: %m\n");
close(fd);
return NULL;
}
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struct wl_shm_pool *pool = wl_shm_create_pool(shm, fd, size);
close(fd);
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struct wl_buffer *buffer = wl_shm_pool_create_buffer(pool, 0, width, height,
stride, WL_SHM_FORMAT_XRGB8888);
wl_shm_pool_destroy(pool);
*data_out = data;
return buffer;
}
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static void write_image(const char *filename, int width, int height,
void *data) {
char size[10 + 1 + 10 + 2 + 1]; // int32_t are max 10 digits
sprintf(size, "%dx%d+0", width, height);
int fd[2];
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if (pipe(fd) != 0) {
fprintf(stderr, "cannot create pipe: %s\n", strerror(errno));
exit(EXIT_FAILURE);
}
pid_t child = fork();
if (child < 0) {
fprintf(stderr, "fork() failed\n");
exit(EXIT_FAILURE);
} else if (child != 0) {
close(fd[0]);
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if (write(fd[1], data, 4 * width * height) < 0) {
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fprintf(stderr, "write() failed: %s\n", strerror(errno));
exit(EXIT_FAILURE);
}
close(fd[1]);
waitpid(child, NULL, 0);
} else {
close(fd[1]);
if (dup2(fd[0], 0) != 0) {
fprintf(stderr, "cannot dup the pipe\n");
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exit(EXIT_FAILURE);
}
close(fd[0]);
// We requested WL_SHM_FORMAT_XRGB8888 in little endian, so that's BGRA
// in big endian.
execlp("convert", "convert", "-depth", "8", "-size", size, "bgra:-",
"-alpha", "opaque", filename, NULL);
fprintf(stderr, "cannot execute convert\n");
exit(EXIT_FAILURE);
}
}
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int main(int argc, char *argv[]) {
struct wl_display * display = wl_display_connect(NULL);
if (display == NULL) {
fprintf(stderr, "failed to create display: %m\n");
return -1;
}
wl_list_init(&output_list);
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struct wl_registry *registry = wl_display_get_registry(display);
wl_registry_add_listener(registry, &registry_listener, NULL);
wl_display_dispatch(display);
wl_display_roundtrip(display);
if (screenshooter == NULL) {
fprintf(stderr, "display doesn't support screenshooter\n");
return -1;
}
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int i = 0;
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struct screenshooter_output *output;
wl_list_for_each(output, &output_list, link) {
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void *data = NULL;
struct wl_buffer *buffer =
create_shm_buffer(output->width, output->height, &data);
if (buffer == NULL) {
return -1;
}
struct orbital_screenshot *screenshot = orbital_screenshooter_shoot(
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screenshooter, output->output, buffer);
orbital_screenshot_add_listener(screenshot, &screenshot_listener,
screenshot);
buffer_copy_done = false;
while (!buffer_copy_done) {
wl_display_roundtrip(display);
}
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char filename[24 + 10]; // int32_t are max 10 digits
snprintf(filename, sizeof(filename), "wayland-screenshot-%d.png", i);
write_image(filename, output->width, output->height, data);
wl_buffer_destroy(buffer);
++i;
}
return EXIT_SUCCESS;
}