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/*
 * Copyright (c) 2009, The Mozilla Foundation
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the Mozilla Foundation nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY The Mozilla Foundation ''AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL The Mozilla Foundation BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Contributors:
 *   Ted Mielczarek <ted.mielczarek@gmail.com>
 *   Karl Tomlinson <karlt+@karlt.net>
 */
/*
 * gdk-screenshot.cpp: Save a screenshot of the root window in .png format.
 *  If a filename is specified as the first argument on the commandline,
 *  then the image will be saved to that filename. Otherwise, the image will
 *  be written to stdout.
 */
#include <gdk/gdk.h>
#include <gdk/gdkx.h>

#include <errno.h>
#include <stdio.h>

gboolean save_to_stdout(const gchar *buf, gsize count,
                        GError **error, gpointer data)
{
  size_t written = fwrite(buf, 1, count, stdout);
  if (written != count) {
    g_set_error(error, G_FILE_ERROR, g_file_error_from_errno(errno),
                "Write to stdout failed: %s", g_strerror(errno));
    return FALSE;
  }

  return TRUE;
}

int main(int argc, char** argv)
{
  gdk_init(&argc, &argv);

  GdkPixbuf* screenshot = nullptr;
  GdkWindow* window = gdk_get_default_root_window();
  screenshot = gdk_pixbuf_get_from_window(window, 0, 0,
                                          gdk_window_get_width(window),
                                          gdk_window_get_height(window));
  if (!screenshot) {
    fprintf(stderr, "%s: failed to create screenshot GdkPixbuf\n", argv[0]);
    return 1;
  }

  GError* error = nullptr;
  if (argc > 1) {
    gdk_pixbuf_save(screenshot, argv[1], "png", &error, nullptr);
  } else {
    gdk_pixbuf_save_to_callback(screenshot, save_to_stdout, nullptr,
                                "png", &error, nullptr);
  }
  if (error) {
    fprintf(stderr, "%s: failed to write screenshot as png: %s\n",
            argv[0], error->message);
    return error->code;
  }

  return 0;
}

// These options are copied from mozglue/build/AsanOptions.cpp
#ifdef MOZ_ASAN
extern "C"
const char* __asan_default_options() {
  return "allow_user_segv_handler=1:alloc_dealloc_mismatch=0:detect_leaks=0";
}
#endif