// Copyright (c) 2009 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 "views/drag_utils.h"

#include <gtk/gtk.h>

#include "app/gfx/canvas.h"
#include "app/gfx/gtk_util.h"
#include "base/logging.h"
#include "app/os_exchange_data.h"
#include "app/os_exchange_data_provider_gtk.h"

namespace drag_utils {

void SetDragImageOnDataObject(const gfx::Canvas& canvas,
                              int width,
                              int height,
                              int cursor_x_offset,
                              int cursor_y_offset,
                              OSExchangeData* data_object) {
  OSExchangeDataProviderGtk& provider(
      static_cast<OSExchangeDataProviderGtk&>(data_object->provider()));

  // Convert the canvas into a GdkPixbuf.
  SkBitmap bitmap = canvas.ExtractBitmap();
  GdkPixbuf* canvas_pixbuf = gfx::GdkPixbufFromSkBitmap(&bitmap);

  // Make a new pixbuf of the requested size and copy it over.
  GdkPixbuf* pixbuf = gdk_pixbuf_new(
      gdk_pixbuf_get_colorspace(canvas_pixbuf),
      gdk_pixbuf_get_has_alpha(canvas_pixbuf),
      gdk_pixbuf_get_bits_per_sample(canvas_pixbuf),
      width,
      height);
  gdk_pixbuf_copy_area(canvas_pixbuf, 0, 0, width, height, pixbuf, 0, 0);
  g_object_unref(canvas_pixbuf);

  // Set the drag data on to the provider.
  provider.SetDragImage(pixbuf, cursor_x_offset, cursor_y_offset);
  g_object_unref(pixbuf);
}

} // namespace drag_utils