Support GrabWindowSnapshot with no g_browser_process

chrome/browser/ui/window_snapshot/window_snapshot_gtk.cc

-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "chrome/browser/ui/window_snapshot/window_snapshot.h"
-
-#include <gdk/gdkx.h>
-#include <gtk/gtk.h>
-
-#include "base/logging.h"
-#include "ui/base/x/x11_util.h"
-#include "ui/gfx/rect.h"
-
-namespace {
-
-cairo_status_t SnapshotCallback(void* closure,
-                                const unsigned char* data,
-                                unsigned int length) {
-  std::vector<unsigned char>* png_representation =
-      static_cast<std::vector<unsigned char>*>(closure);
-
-  size_t old_size = png_representation->size();
-  png_representation->resize(old_size + length);
-  memcpy(&(*png_representation)[old_size], data, length);
-  return CAIRO_STATUS_SUCCESS;
-}
-
-}  // namespace
-
-namespace chrome {
-
-bool GrabWindowSnapshotImpl(gfx::NativeWindow window_handle,
-                            std::vector<unsigned char>* png_representation,
-                            const gfx::Rect& snapshot_bounds) {
-  GdkWindow* gdk_window = gtk_widget_get_window(GTK_WIDGET(window_handle));
-  Display* display = GDK_WINDOW_XDISPLAY(gdk_window);
-  XID win = GDK_WINDOW_XID(gdk_window);
-
-  gfx::Rect window_bounds;
-  if (ui::GetWindowRect(win, &window_bounds) == 0) {
-    LOG(ERROR) << "Couldn't get window bounds";
-    return false;
-  }
-
-  DCHECK_LE(snapshot_bounds.right(), window_bounds.width());
-  DCHECK_LE(snapshot_bounds.bottom(), window_bounds.height());
-
-  XImage* image = XGetImage(
-      display, win, snapshot_bounds.x(), snapshot_bounds.y(),
-      snapshot_bounds.width(), snapshot_bounds.height(), AllPlanes, ZPixmap);
-  if (!image) {
-    LOG(ERROR) << "Couldn't get image";
-    return false;
-  }
-  if (image->depth != 24) {
-    LOG(ERROR)<< "Unsupported image depth " << image->depth;
-    return false;
-  }
-  cairo_surface_t* surface =
-      cairo_image_surface_create_for_data(
-          reinterpret_cast<unsigned char*>(image->data),
-          CAIRO_FORMAT_RGB24,
-          image->width,
-          image->height,
-          image->bytes_per_line);
-
-  if (!surface) {
-    LOG(ERROR) << "Unable to create Cairo surface from XImage data";
-    return false;
-  }
-  cairo_surface_write_to_png_stream(
-      surface, SnapshotCallback, png_representation);
-  cairo_surface_destroy(surface);
-
-  return true;
-}
-
-}  // namespace chrome