wlroots/examples/screenshot.c

285 lines
8.0 KiB
C

/*
* 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.
*/
#define _XOPEN_SOURCE 700
#define _POSIX_C_SOURCE 199309L
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/wait.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <wayland-client.h>
#include <limits.h>
#include <sys/param.h>
#include <screenshooter-client-protocol.h>
#include "../backend/wayland/os-compatibility.c"
static struct wl_shm *shm = NULL;
static struct orbital_screenshooter *screenshooter = NULL;
static struct wl_list output_list;
int min_x, min_y, max_x, max_y;
int buffer_copy_done;
struct screenshooter_output {
struct wl_output *output;
struct wl_buffer *buffer;
int width, height, offset_x, offset_y;
void *data;
struct wl_list link;
};
static void output_handle_geometry(void *data, struct wl_output *wl_output,
int x, int y, int physical_width, int physical_height, int subpixel,
const char *make, const char *model, int transform) {
struct screenshooter_output *output = wl_output_get_user_data(wl_output);
if (wl_output == output->output) {
output->offset_x = x;
output->offset_y = y;
}
}
static void output_handle_mode(void *data, struct wl_output *wl_output,
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;
}
}
static void output_handle_done(void *data, struct wl_output *wl_output) {
}
static const struct wl_output_listener output_listener = {
.geometry = output_handle_geometry,
.mode = output_handle_mode,
.done = output_handle_done,
};
static void screenshot_done(void *data, struct orbital_screenshot *screenshot) {
buffer_copy_done = 1;
}
static const struct orbital_screenshot_listener screenshot_listener = {
.done = screenshot_done,
};
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);
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,
&orbital_screenshooter_interface, 1);
}
}
static void handle_global_remove(void *data, struct wl_registry *registry,
uint32_t name) {
// Unimplemented
}
static const struct wl_registry_listener registry_listener = {
.global = handle_global,
.global_remove = handle_global_remove,
};
static struct wl_buffer *create_shm_buffer(int width, int height,
void **data_out) {
int stride = width * 4;
int size = stride * height;
int fd = os_create_anonymous_file(size);
if (fd < 0) {
fprintf(stderr, "creating a buffer file for %d B failed: %m\n", size);
return NULL;
}
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;
}
struct wl_shm_pool *pool = wl_shm_create_pool(shm, fd, size);
close(fd);
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;
}
static void argb_to_rgba(uint32_t *data, size_t height, size_t stride) {
size_t n = height*stride/4;
for (size_t i = 0; i < n; ++i) {
uint32_t v = data[i];
uint32_t rgb = v & 0x00ffffff;
uint32_t a = (v & 0xff000000) >> 24;
data[i] = (rgb << 8) | a;
}
}
static void write_image(const char *filename, int width, int height) {
int buffer_stride = width * 4;
void *data = calloc(1, buffer_stride * height);
if (!data) {
return;
}
struct screenshooter_output *output, *next;
wl_list_for_each_safe(output, next, &output_list, link) {
int output_stride = output->width * 4;
void *s = output->data;
void *d = data + (output->offset_y - min_y) * buffer_stride +
(output->offset_x - min_x) * 4;
for (int i = 0; i < output->height; i++) {
memcpy(d, s, output_stride);
d += buffer_stride;
s += output_stride;
}
free(output);
}
argb_to_rgba(data, height, buffer_stride);
char size[10 + 1 + 10 + 2 + 1]; // int32_t are max 10 digits
sprintf(size, "%dx%d+0", width, height);
int fd[2];
pipe(fd);
pid_t child = fork();
if (child < 0) {
fprintf(stderr, "fork() failed\n");
exit(EXIT_FAILURE);
} else if (child != 0) {
close(fd[0]);
write(fd[1], data, buffer_stride * height);
close(fd[1]);
free(data);
waitpid(child, NULL, 0);
} else {
close(fd[1]);
if (dup2(fd[0], 0) != 0) {
fprintf(stderr, "cannot dup the pipe\n");
exit(EXIT_FAILURE);
}
close(fd[0]);
execlp("convert", "convert", "-depth", "8", "-size", size, "rgba:-",
"-alpha", "opaque", filename, NULL);
fprintf(stderr, "cannot execute convert\n");
exit(EXIT_FAILURE);
}
}
static int set_buffer_size(int *width, int *height) {
struct screenshooter_output *output;
min_x = min_y = INT_MAX;
max_x = max_y = INT_MIN;
int position = 0;
wl_list_for_each_reverse(output, &output_list, link) {
output->offset_x = position;
position += output->width;
}
wl_list_for_each(output, &output_list, link) {
min_x = MIN(min_x, output->offset_x);
min_y = MIN(min_y, output->offset_y);
max_x = MAX(max_x, output->offset_x + output->width);
max_y = MAX(max_y, output->offset_y + output->height);
}
if (max_x <= min_x || max_y <= min_y) {
return -1;
}
*width = max_x - min_x;
*height = max_y - min_y;
return 0;
}
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);
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;
}
int width, height;
if (set_buffer_size(&width, &height)) {
fprintf(stderr, "cannot set buffer size\n");
return -1;
}
struct screenshooter_output *output;
wl_list_for_each(output, &output_list, link) {
output->buffer = create_shm_buffer(output->width, output->height, &output->data);
if (output->buffer == NULL) {
return -1;
}
struct orbital_screenshot *screenshot = orbital_screenshooter_shoot(
screenshooter, output->output, output->buffer);
orbital_screenshot_add_listener(screenshot, &screenshot_listener, screenshot);
buffer_copy_done = 0;
while (!buffer_copy_done)
wl_display_roundtrip(display);
}
write_image("wayland-screenshot.png", width, height);
return EXIT_SUCCESS;
}