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Sourcecode: wayland-demos version File versions  Download package

screenshot.c

/*
 * Copyright © 2008 Kristian Høgsberg
 *
 * Permission to use, copy, modify, distribute, and sell this software and its
 * documentation for any purpose is hereby granted without fee, provided that
 * the above copyright notice appear in all copies and that both that copyright
 * notice and this permission notice appear in supporting documentation, and
 * that the name of the copyright holders not be used in advertising or
 * publicity pertaining to distribution of the software without specific,
 * written prior permission.  The copyright holders make no representations
 * about the suitability of this software for any purpose.  It is provided "as
 * is" without express or implied warranty.
 *
 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
 * OF THIS SOFTWARE.
 */

#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/mman.h>
#include <glib.h>

#include "wayland-client.h"
#include "wayland-glib.h"
#include "screenshooter-client-protocol.h"

/* The screenshooter is a good example of a custom object exposed by
 * the compositor and serves as a test bed for implementing client
 * side marshalling outside libwayland.so */

static struct wl_output *output;
static struct wl_shm *shm;
static struct wl_visual *visual;
static struct screenshooter *screenshooter;
static int output_width, output_height;

static void
display_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)
{
}

static void
display_handle_mode(void *data,
                struct wl_output *wl_output,
                uint32_t flags,
                int width,
                int height,
                int refresh)
{
      output_width = width;
      output_height = height;
}

static const struct wl_output_listener output_listener = {
      display_handle_geometry,
      display_handle_mode
};

static void
handle_global(struct wl_display *display, uint32_t id,
            const char *interface, uint32_t version, void *data)
{
      static int visual_count;

      if (strcmp(interface, "wl_output") == 0) {
            output = wl_output_create(display, id, 1);
            wl_output_add_listener(output, &output_listener, NULL);
      } else if (strcmp(interface, "wl_shm") == 0) {
            shm = wl_shm_create(display, id, 1);
      } else if (strcmp(interface, "wl_visual") == 0) {
            if  (visual_count++ == 1)
                  visual = wl_visual_create(display, id, 1);
      } else if (strcmp(interface, "screenshooter") == 0) {
            screenshooter = screenshooter_create(display, id, 1);
      }
}

static void
sync_callback(void *data)
{
   int *done = data;

   *done = 1;
}

static void
roundtrip(struct wl_display *display)
{
      int done;

      done = 0;
      wl_display_sync_callback(display, sync_callback, &done);
      wl_display_iterate(display, WL_DISPLAY_WRITABLE);
      while (!done)
            wl_display_iterate(display, WL_DISPLAY_READABLE);
}

static struct wl_buffer *
create_shm_buffer(int width, int height, void **data_out)
{
      char filename[] = "/tmp/wayland-shm-XXXXXX";
      struct wl_buffer *buffer;
      int fd, size, stride;
      void *data;

      fd = mkstemp(filename);
      if (fd < 0) {
            fprintf(stderr, "open %s failed: %m\n", filename);
            return NULL;
      }
      stride = width * 4;
      size = stride * height;
      if (ftruncate(fd, size) < 0) {
            fprintf(stderr, "ftruncate failed: %m\n");
            close(fd);
            return NULL;
      }

      data = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
      unlink(filename);

      if (data == MAP_FAILED) {
            fprintf(stderr, "mmap failed: %m\n");
            close(fd);
            return NULL;
      }

      buffer = wl_shm_create_buffer(shm, fd, width, height, stride, visual);

      close(fd);

      *data_out = data;

      return buffer;
}

int main(int argc, char *argv[])
{
      struct wl_display *display;
      struct wl_buffer *buffer;
      void *data;

      display = wl_display_connect(NULL);
      if (display == NULL) {
            fprintf(stderr, "failed to create display: %m\n");
            return -1;
      }

      wl_display_add_global_listener(display, handle_global, &screenshooter);
      wl_display_iterate(display, WL_DISPLAY_READABLE);
      roundtrip(display);
      if (screenshooter == NULL) {
            fprintf(stderr, "display doesn't support screenshooter\n");
            return -1;
      }

      buffer = create_shm_buffer(output_width, output_height, &data);
      screenshooter_shoot(screenshooter, output, buffer);
      roundtrip(display);

      /* FIXME: write png */

      return 0;
}

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