wlroots/examples/screencopy.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 <png.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <unistd.h>
#include <wayland-client-protocol.h>
#include "wlr-screencopy-unstable-v1-client-protocol.h"
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struct format {
enum wl_shm_format wl_format;
bool is_bgr;
};
static struct wl_shm *shm = NULL;
static struct zwlr_screencopy_manager_v1 *screencopy_manager = NULL;
static struct wl_output *output = NULL;
static struct {
struct wl_buffer *wl_buffer;
void *data;
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enum wl_shm_format format;
int width, height, stride;
bool y_invert;
} buffer;
bool buffer_copy_done = false;
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// wl_shm_format describes little-endian formats, libpng uses big-endian
// formats (so Wayland's ABGR is libpng's RGBA).
static const struct format formats[] = {
{WL_SHM_FORMAT_XRGB8888, true},
{WL_SHM_FORMAT_ARGB8888, true},
{WL_SHM_FORMAT_XBGR8888, false},
{WL_SHM_FORMAT_ABGR8888, false},
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};
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static struct wl_buffer *create_shm_buffer(enum wl_shm_format fmt,
int width, int height, int stride, void **data_out) {
int size = stride * height;
const char shm_name[] = "/wlroots-screencopy";
int fd = shm_open(shm_name, O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR);
if (fd < 0) {
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fprintf(stderr, "shm_open failed\n");
return NULL;
}
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shm_unlink(shm_name);
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;
}
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,
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stride, fmt);
wl_shm_pool_destroy(pool);
*data_out = data;
return buffer;
}
static void frame_handle_buffer(void *data,
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struct zwlr_screencopy_frame_v1 *frame, uint32_t format,
uint32_t width, uint32_t height, uint32_t stride) {
buffer.format = format;
buffer.width = width;
buffer.height = height;
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buffer.stride = stride;
buffer.wl_buffer =
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create_shm_buffer(format, width, height, stride, &buffer.data);
if (buffer.wl_buffer == NULL) {
fprintf(stderr, "failed to create buffer\n");
exit(EXIT_FAILURE);
}
zwlr_screencopy_frame_v1_copy(frame, buffer.wl_buffer);
}
static void frame_handle_flags(void *data,
struct zwlr_screencopy_frame_v1 *frame, uint32_t flags) {
buffer.y_invert = flags & ZWLR_SCREENCOPY_FRAME_V1_FLAGS_Y_INVERT;
}
static void frame_handle_ready(void *data,
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struct zwlr_screencopy_frame_v1 *frame, uint32_t tv_sec_hi,
uint32_t tv_sec_lo, uint32_t tv_nsec) {
buffer_copy_done = true;
}
static void frame_handle_failed(void *data,
struct zwlr_screencopy_frame_v1 *frame) {
fprintf(stderr, "failed to copy frame\n");
exit(EXIT_FAILURE);
}
static const struct zwlr_screencopy_frame_v1_listener frame_listener = {
.buffer = frame_handle_buffer,
.flags = frame_handle_flags,
.ready = frame_handle_ready,
.failed = frame_handle_failed,
};
static void handle_global(void *data, struct wl_registry *registry,
uint32_t name, const char *interface, uint32_t version) {
if (strcmp(interface, wl_output_interface.name) == 0 && output == NULL) {
output = wl_registry_bind(registry, name, &wl_output_interface, 1);
} else if (strcmp(interface, wl_shm_interface.name) == 0) {
shm = wl_registry_bind(registry, name, &wl_shm_interface, 1);
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} else if (strcmp(interface,
zwlr_screencopy_manager_v1_interface.name) == 0) {
screencopy_manager = wl_registry_bind(registry, name,
&zwlr_screencopy_manager_v1_interface, 1);
}
}
static void handle_global_remove(void *data, struct wl_registry *registry,
uint32_t name) {
// Who cares?
}
static const struct wl_registry_listener registry_listener = {
.global = handle_global,
.global_remove = handle_global_remove,
};
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static void write_image(char *filename, enum wl_shm_format wl_fmt, int width,
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int height, int stride, bool y_invert, png_bytep data) {
const struct format *fmt = NULL;
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for (size_t i = 0; i < sizeof(formats) / sizeof(formats[0]); ++i) {
if (formats[i].wl_format == wl_fmt) {
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fmt = &formats[i];
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break;
}
}
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if (fmt == NULL) {
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fprintf(stderr, "unsupported format %"PRIu32"\n", wl_fmt);
exit(EXIT_FAILURE);
}
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FILE *f = fopen(filename, "wb");
if (f == NULL) {
fprintf(stderr, "failed to open output file\n");
exit(EXIT_FAILURE);
}
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png_structp png =
png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
png_infop info = png_create_info_struct(png);
png_init_io(png, f);
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png_set_IHDR(png, info, width, height, 8, PNG_COLOR_TYPE_RGBA,
PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT,
PNG_FILTER_TYPE_DEFAULT);
if (fmt->is_bgr) {
png_set_bgr(png);
}
png_write_info(png, info);
for (size_t i = 0; i < (size_t)height; ++i) {
png_bytep row;
if (y_invert) {
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row = data + (height - i - 1) * stride;
} else {
row = data + i * stride;
}
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png_write_row(png, row);
}
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png_write_end(png, NULL);
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png_destroy_write_struct(&png, &info);
fclose(f);
}
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 EXIT_FAILURE;
}
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 (shm == NULL) {
fprintf(stderr, "compositor is missing wl_shm\n");
return EXIT_FAILURE;
}
if (screencopy_manager == NULL) {
fprintf(stderr, "compositor doesn't support wlr-screencopy-unstable-v1\n");
return EXIT_FAILURE;
}
if (output == NULL) {
fprintf(stderr, "no output available\n");
return EXIT_FAILURE;
}
struct zwlr_screencopy_frame_v1 *frame =
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zwlr_screencopy_manager_v1_capture_output(screencopy_manager, 0, output);
zwlr_screencopy_frame_v1_add_listener(frame, &frame_listener, NULL);
while (!buffer_copy_done && wl_display_dispatch(display) != -1) {
// This space is intentionally left blank
}
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write_image("wayland-screenshot.png", buffer.format, buffer.width,
buffer.height, buffer.stride, buffer.y_invert, buffer.data);
wl_buffer_destroy(buffer.wl_buffer);
return EXIT_SUCCESS;
}