Exemple #1
0
void
gimp_image_resize_with_layers (GimpImage    *image,
                               GimpContext  *context,
                               gint          new_width,
                               gint          new_height,
                               gint          offset_x,
                               gint          offset_y,
                               GimpItemSet   layer_set,
                               gboolean      resize_text_layers,
                               GimpProgress *progress)
{
  GList   *list;
  GList   *resize_layers;
  gdouble  progress_max;
  gdouble  progress_current = 1.0;
  gint     old_width, old_height;

  g_return_if_fail (GIMP_IS_IMAGE (image));
  g_return_if_fail (GIMP_IS_CONTEXT (context));
  g_return_if_fail (new_width > 0 && new_height > 0);
  g_return_if_fail (progress == NULL || GIMP_IS_PROGRESS (progress));

  gimp_set_busy (image->gimp);

  g_object_freeze_notify (G_OBJECT (image));

  gimp_image_undo_group_start (image, GIMP_UNDO_GROUP_IMAGE_RESIZE,
                               C_("undo-type", "Resize Image"));

  resize_layers = gimp_image_item_list_get_list (image, NULL,
                                                 GIMP_ITEM_TYPE_LAYERS,
                                                 layer_set);

  progress_max = (gimp_container_get_n_children (gimp_image_get_layers (image))   +
                  gimp_container_get_n_children (gimp_image_get_channels (image)) +
                  gimp_container_get_n_children (gimp_image_get_vectors (image))  +
                  g_list_length (resize_layers)                                   +
                  1 /* selection */);

  old_width  = gimp_image_get_width  (image);
  old_height = gimp_image_get_height (image);

  /*  Push the image size to the stack  */
  gimp_image_undo_push_image_size (image, NULL,
                                   -offset_x, -offset_y,
                                   new_width, new_height);

  /*  Set the new width and height  */
  g_object_set (image,
                "width",  new_width,
                "height", new_height,
                NULL);

  /*  Resize all channels  */
  for (list = gimp_image_get_channel_iter (image);
       list;
       list = g_list_next (list))
    {
      GimpItem *item = list->data;

      gimp_item_resize (item, context,
                        new_width, new_height, offset_x, offset_y);

      if (progress)
        gimp_progress_set_value (progress, progress_current++ / progress_max);
    }

  /*  Resize all vectors  */
  for (list = gimp_image_get_vectors_iter (image);
       list;
       list = g_list_next (list))
    {
      GimpItem *item = list->data;

      gimp_item_resize (item, context,
                        new_width, new_height, offset_x, offset_y);

      if (progress)
        gimp_progress_set_value (progress, progress_current++ / progress_max);
    }

  /*  Don't forget the selection mask!  */
  gimp_item_resize (GIMP_ITEM (gimp_image_get_mask (image)), context,
                    new_width, new_height, offset_x, offset_y);

  if (progress)
    gimp_progress_set_value (progress, progress_current++ / progress_max);

  /*  Reposition all layers  */
  for (list = gimp_image_get_layer_iter (image);
       list;
       list = g_list_next (list))
    {
      GimpItem *item = list->data;

      gimp_item_translate (item, offset_x, offset_y, TRUE);

      if (progress)
        gimp_progress_set_value (progress, progress_current++ / progress_max);
    }

  /*  Resize all resize_layers to image size  */
  for (list = resize_layers; list; list = g_list_next (list))
    {
      GimpItem *item = list->data;
      gint      old_offset_x;
      gint      old_offset_y;

      /*  group layers can't be resized here  */
      if (gimp_viewable_get_children (GIMP_VIEWABLE (item)))
        continue;

      if (! resize_text_layers && gimp_item_is_text_layer (item))
        continue;

      gimp_item_get_offset (item, &old_offset_x, &old_offset_y);

      gimp_item_resize (item, context,
                        new_width, new_height,
                        old_offset_x, old_offset_y);

      if (progress)
        gimp_progress_set_value (progress, progress_current++ / progress_max);
    }

  g_list_free (resize_layers);

  /*  Reposition or remove all guides  */
  list = gimp_image_get_guides (image);

  while (list)
    {
      GimpGuide *guide        = list->data;
      gboolean   remove_guide = FALSE;
      gint       new_position = gimp_guide_get_position (guide);

      list = g_list_next (list);

      switch (gimp_guide_get_orientation (guide))
        {
        case GIMP_ORIENTATION_HORIZONTAL:
          new_position += offset_y;
          if (new_position < 0 || new_position > new_height)
            remove_guide = TRUE;
          break;

        case GIMP_ORIENTATION_VERTICAL:
          new_position += offset_x;
          if (new_position < 0 || new_position > new_width)
            remove_guide = TRUE;
          break;

        default:
          break;
        }

      if (remove_guide)
        gimp_image_remove_guide (image, guide, TRUE);
      else if (new_position != gimp_guide_get_position (guide))
        gimp_image_move_guide (image, guide, new_position, TRUE);
    }

  /*  Reposition or remove sample points  */
  list = gimp_image_get_sample_points (image);

  while (list)
    {
      GimpSamplePoint *sample_point        = list->data;
      gboolean         remove_sample_point = FALSE;
      gint             new_x               = sample_point->x;
      gint             new_y               = sample_point->y;

      list = g_list_next (list);

      new_y += offset_y;
      if ((sample_point->y < 0) || (sample_point->y > new_height))
        remove_sample_point = TRUE;

      new_x += offset_x;
      if ((sample_point->x < 0) || (sample_point->x > new_width))
        remove_sample_point = TRUE;

      if (remove_sample_point)
        gimp_image_remove_sample_point (image, sample_point, TRUE);
      else if (new_x != sample_point->x || new_y != sample_point->y)
        gimp_image_move_sample_point (image, sample_point,
                                      new_x, new_y, TRUE);
    }

  gimp_image_undo_group_end (image);

  gimp_image_size_changed_detailed (image,
                                    offset_x, offset_y,
                                    old_width, old_height);

  g_object_thaw_notify (G_OBJECT (image));

  gimp_unset_busy (image->gimp);
}
Exemple #2
0
void
gimp_image_crop (GimpImage   *image,
                 GimpContext *context,
                 gint         x1,
                 gint         y1,
                 gint         x2,
                 gint         y2,
                 gboolean     active_layer_only,
                 gboolean     crop_layers)
{
  gint width, height;
  gint previous_width, previous_height;

  g_return_if_fail (GIMP_IS_IMAGE (image));
  g_return_if_fail (GIMP_IS_CONTEXT (context));

  previous_width  = gimp_image_get_width (image);
  previous_height = gimp_image_get_height (image);

  width  = x2 - x1;
  height = y2 - y1;

  /*  Make sure new width and height are non-zero  */
  if (width < 1 || height < 1)
    return;

  gimp_set_busy (image->gimp);

  if (active_layer_only)
    {
      GimpLayer *layer;
      gint       off_x, off_y;

      layer = gimp_image_get_active_layer (image);

      gimp_item_offsets (GIMP_ITEM (layer), &off_x, &off_y);

      off_x -= x1;
      off_y -= y1;

      gimp_item_resize (GIMP_ITEM (layer), context, width, height, off_x, off_y);
    }
  else
    {
      GimpItem *item;
      GList    *list;

      g_object_freeze_notify (G_OBJECT (image));

      if (crop_layers)
        gimp_image_undo_group_start (image, GIMP_UNDO_GROUP_IMAGE_CROP,
                                     C_("command", "Crop Image"));
      else
        gimp_image_undo_group_start (image, GIMP_UNDO_GROUP_IMAGE_RESIZE,
                                     _("Resize Image"));

      /*  Push the image size to the stack  */
      gimp_image_undo_push_image_size (image,
                                       NULL,
                                       x1,
                                       y1,
                                       width,
                                       height);

      /*  Set the new width and height  */
      g_object_set (image,
                    "width",  width,
                    "height", height,
                    NULL);

      /*  Resize all channels  */
      for (list = GIMP_LIST (image->channels)->list;
           list;
           list = g_list_next (list))
        {
          item = (GimpItem *) list->data;

          gimp_item_resize (item, context, width, height, -x1, -y1);
        }

      /*  Resize all vectors  */
      for (list = GIMP_LIST (image->vectors)->list;
           list;
           list = g_list_next (list))
        {
          item = (GimpItem *) list->data;

          gimp_item_resize (item, context, width, height, -x1, -y1);
        }

      /*  Don't forget the selection mask!  */
      gimp_item_resize (GIMP_ITEM (gimp_image_get_mask (image)), context,
                        width, height, -x1, -y1);

      /*  crop all layers  */
      list = GIMP_LIST (image->layers)->list;

      while (list)
        {
          item = (GimpItem *) list->data;

          list = g_list_next (list);

          gimp_item_translate (item, -x1, -y1, TRUE);

          if (crop_layers)
            {
              gint off_x, off_y;
              gint lx1, ly1, lx2, ly2;

              gimp_item_offsets (item, &off_x, &off_y);

              lx1 = CLAMP (off_x, 0, gimp_image_get_width  (image));
              ly1 = CLAMP (off_y, 0, gimp_image_get_height (image));
              lx2 = CLAMP (gimp_item_width  (item) + off_x,
                           0, gimp_image_get_width (image));
              ly2 = CLAMP (gimp_item_height (item) + off_y,
                           0, gimp_image_get_height (image));

              width  = lx2 - lx1;
              height = ly2 - ly1;

              if (width > 0 && height > 0)
                gimp_item_resize (item, context, width, height,
                                  -(lx1 - off_x),
                                  -(ly1 - off_y));
              else
                gimp_image_remove_layer (image, GIMP_LAYER (item));
            }
        }

      /*  Reposition or remove all guides  */
      list = gimp_image_get_guides (image);
      while (list)
        {
          GimpGuide *guide        = list->data;
          gboolean   remove_guide = FALSE;
          gint       position     = gimp_guide_get_position (guide);

          list = g_list_next (list);

          switch (gimp_guide_get_orientation (guide))
            {
            case GIMP_ORIENTATION_HORIZONTAL:
              if ((position < y1) || (position > y2))
                remove_guide = TRUE;
              else
                position -= y1;
              break;

            case GIMP_ORIENTATION_VERTICAL:
              if ((position < x1) || (position > x2))
                remove_guide = TRUE;
              else
                position -= x1;
              break;

            default:
              break;
            }

          if (remove_guide)
            gimp_image_remove_guide (image, guide, TRUE);
          else if (position != gimp_guide_get_position (guide))
            gimp_image_move_guide (image, guide, position, TRUE);
        }

      /*  Reposition or remove sample points  */
      list = gimp_image_get_sample_points (image);
      while (list)
        {
          GimpSamplePoint *sample_point        = list->data;
          gboolean         remove_sample_point = FALSE;
          gint             new_x               = sample_point->x;
          gint             new_y               = sample_point->y;

          list = g_list_next (list);

          new_y -= y1;
          if ((sample_point->y < y1) || (sample_point->y > y2))
            remove_sample_point = TRUE;

          new_x -= x1;
          if ((sample_point->x < x1) || (sample_point->x > x2))
            remove_sample_point = TRUE;

          if (remove_sample_point)
            gimp_image_remove_sample_point (image, sample_point, TRUE);
          else if (new_x != sample_point->x || new_y != sample_point->y)
            gimp_image_move_sample_point (image, sample_point,
                                          new_x, new_y, TRUE);
        }

      gimp_image_undo_group_end (image);

      gimp_image_update (image,
                         0, 0,
                         gimp_image_get_width  (image),
                         gimp_image_get_height (image));

      gimp_image_size_changed_detailed (image,
                                        -x1,
                                        -y1,
                                        previous_width,
                                        previous_height);

      g_object_thaw_notify (G_OBJECT (image));
    }

  gimp_unset_busy (image->gimp);
}
Exemple #3
0
void
gimp_image_crop (GimpImage    *image,
                 GimpContext  *context,
                 GimpFillType  fill_type,
                 gint          x,
                 gint          y,
                 gint          width,
                 gint          height,
                 gboolean      crop_layers)
{
  GList *list;
  gint   previous_width;
  gint   previous_height;

  g_return_if_fail (GIMP_IS_IMAGE (image));
  g_return_if_fail (GIMP_IS_CONTEXT (context));

  previous_width  = gimp_image_get_width  (image);
  previous_height = gimp_image_get_height (image);

  /*  Make sure new width and height are non-zero  */
  if (width < 1 || height < 1)
    return;

  gimp_set_busy (image->gimp);

  g_object_freeze_notify (G_OBJECT (image));

  if (crop_layers)
    gimp_image_undo_group_start (image, GIMP_UNDO_GROUP_IMAGE_CROP,
                                 C_("undo-type", "Crop Image"));
  else
    gimp_image_undo_group_start (image, GIMP_UNDO_GROUP_IMAGE_RESIZE,
                                 C_("undo-type", "Resize Image"));

  /*  Push the image size to the stack  */
  gimp_image_undo_push_image_size (image, NULL,
                                   x, y, width, height);

  /*  Set the new width and height  */
  g_object_set (image,
                "width",  width,
                "height", height,
                NULL);

  /*  Resize all channels  */
  for (list = gimp_image_get_channel_iter (image);
       list;
       list = g_list_next (list))
    {
      GimpItem *item = list->data;

      gimp_item_resize (item, context, GIMP_FILL_TRANSPARENT,
                        width, height, -x, -y);
    }

  /*  Resize all vectors  */
  for (list = gimp_image_get_vectors_iter (image);
       list;
       list = g_list_next (list))
    {
      GimpItem *item = list->data;

      gimp_item_resize (item, context, GIMP_FILL_TRANSPARENT,
                        width, height, -x, -y);
    }

  /*  Don't forget the selection mask!  */
  gimp_item_resize (GIMP_ITEM (gimp_image_get_mask (image)),
                    context, GIMP_FILL_TRANSPARENT,
                    width, height, -x, -y);

  /*  crop all layers  */
  list = gimp_image_get_layer_iter (image);

  while (list)
    {
      GimpItem *item = list->data;

      list = g_list_next (list);

      gimp_item_translate (item, -x, -y, TRUE);

      if (crop_layers)
        {
          gint off_x, off_y;
          gint lx1, ly1, lx2, ly2;

          gimp_item_get_offset (item, &off_x, &off_y);

          lx1 = CLAMP (off_x, 0, gimp_image_get_width  (image));
          ly1 = CLAMP (off_y, 0, gimp_image_get_height (image));
          lx2 = CLAMP (gimp_item_get_width  (item) + off_x,
                       0, gimp_image_get_width (image));
          ly2 = CLAMP (gimp_item_get_height (item) + off_y,
                       0, gimp_image_get_height (image));

          width  = lx2 - lx1;
          height = ly2 - ly1;

          if (width > 0 && height > 0)
            {
              gimp_item_resize (item, context, fill_type,
                                width, height,
                                -(lx1 - off_x),
                                -(ly1 - off_y));
            }
          else
            {
              gimp_image_remove_layer (image, GIMP_LAYER (item),
                                       TRUE, NULL);
            }
        }
    }

  /*  Reposition or remove guides  */
  list = gimp_image_get_guides (image);

  while (list)
    {
      GimpGuide *guide        = list->data;
      gboolean   remove_guide = FALSE;
      gint       position     = gimp_guide_get_position (guide);

      list = g_list_next (list);

      switch (gimp_guide_get_orientation (guide))
        {
        case GIMP_ORIENTATION_HORIZONTAL:
          position -= y;
          if ((position < 0) || (position > height))
            remove_guide = TRUE;
          break;

        case GIMP_ORIENTATION_VERTICAL:
          position -= x;
          if ((position < 0) || (position > width))
            remove_guide = TRUE;
          break;

        default:
          break;
        }

      if (remove_guide)
        gimp_image_remove_guide (image, guide, TRUE);
      else if (position != gimp_guide_get_position (guide))
        gimp_image_move_guide (image, guide, position, TRUE);
    }

  /*  Reposition or remove sample points  */
  list = gimp_image_get_sample_points (image);

  while (list)
    {
      GimpSamplePoint *sample_point        = list->data;
      gboolean         remove_sample_point = FALSE;
      gint             old_x;
      gint             old_y;
      gint             new_x;
      gint             new_y;

      list = g_list_next (list);

      gimp_sample_point_get_position (sample_point, &old_x, &old_y);
      new_x = old_x;
      new_y = old_y;

      new_y -= y;
      if ((new_y < 0) || (new_y > height))
       remove_sample_point = TRUE;

      new_x -= x;
      if ((new_x < 0) || (new_x > width))
        remove_sample_point = TRUE;

      if (remove_sample_point)
        gimp_image_remove_sample_point (image, sample_point, TRUE);
      else if (new_x != old_x || new_y != old_y)
        gimp_image_move_sample_point (image, sample_point,
                                      new_x, new_y, TRUE);
    }

  gimp_image_undo_group_end (image);

  gimp_image_size_changed_detailed (image,
                                    -x, -y,
                                    previous_width, previous_height);

  g_object_thaw_notify (G_OBJECT (image));

  gimp_unset_busy (image->gimp);
}
void
gimp_image_rotate (GimpImage        *image,
                   GimpContext      *context,
                   GimpRotationType  rotate_type,
                   GimpProgress     *progress)
{
  GList    *list;
  gdouble   center_x;
  gdouble   center_y;
  gdouble   progress_max;
  gdouble   progress_current = 1.0;
  gint      new_image_width;
  gint      new_image_height;
  gint      previous_image_width;
  gint      previous_image_height;
  gint      offset_x;
  gint      offset_y;
  gboolean  size_changed;

  g_return_if_fail (GIMP_IS_IMAGE (image));
  g_return_if_fail (GIMP_IS_CONTEXT (context));
  g_return_if_fail (progress == NULL || GIMP_IS_PROGRESS (progress));

  gimp_set_busy (image->gimp);

  previous_image_width  = gimp_image_get_width  (image);
  previous_image_height = gimp_image_get_height (image);

  center_x              = previous_image_width  / 2.0;
  center_y              = previous_image_height / 2.0;

  progress_max = (gimp_container_get_n_children (gimp_image_get_channels (image)) +
                  gimp_container_get_n_children (gimp_image_get_layers (image))   +
                  gimp_container_get_n_children (gimp_image_get_vectors (image))  +
                  1 /* selection */);

  g_object_freeze_notify (G_OBJECT (image));

  gimp_image_undo_group_start (image, GIMP_UNDO_GROUP_IMAGE_ROTATE, NULL);

  /*  Resize the image (if needed)  */
  switch (rotate_type)
    {
    case GIMP_ROTATE_90:
    case GIMP_ROTATE_270:
      new_image_width  = gimp_image_get_height (image);
      new_image_height = gimp_image_get_width  (image);
      size_changed     = TRUE;
      offset_x         = (gimp_image_get_width  (image) - new_image_width)  / 2;
      offset_y         = (gimp_image_get_height (image) - new_image_height) / 2;
      break;

    case GIMP_ROTATE_180:
      new_image_width  = gimp_image_get_width  (image);
      new_image_height = gimp_image_get_height (image);
      size_changed     = FALSE;
      offset_x         = 0;
      offset_y         = 0;
      break;

    default:
      g_assert_not_reached ();
      return;
    }

  /*  Rotate all channels  */
  for (list = gimp_image_get_channel_iter (image);
       list;
       list = g_list_next (list))
    {
      GimpItem *item = list->data;

      gimp_item_rotate (item, context, rotate_type, center_x, center_y, FALSE);

      gimp_item_set_offset (item, 0, 0);

      if (progress)
        gimp_progress_set_value (progress, progress_current++ / progress_max);
    }

  /*  Rotate all vectors  */
  for (list = gimp_image_get_vectors_iter (image);
       list;
       list = g_list_next (list))
    {
      GimpItem *item = list->data;

      gimp_item_rotate (item, context, rotate_type, center_x, center_y, FALSE);

      gimp_item_set_offset (item, 0, 0);
      gimp_item_set_size (item, new_image_width, new_image_height);

      gimp_item_translate (item,
                           (new_image_width  - gimp_image_get_width  (image)) / 2,
                           (new_image_height - gimp_image_get_height (image)) / 2,
                           FALSE);

      if (progress)
        gimp_progress_set_value (progress, progress_current++ / progress_max);
    }

  /*  Don't forget the selection mask!  */
  {
    GimpChannel *mask = gimp_image_get_mask (image);

    gimp_item_rotate (GIMP_ITEM (mask), context,
                      rotate_type, center_x, center_y, FALSE);

    gimp_item_set_offset (GIMP_ITEM (mask), 0, 0);

    if (progress)
      gimp_progress_set_value (progress, progress_current++ / progress_max);
  }

  /*  Rotate all layers  */
  for (list = gimp_image_get_layer_iter (image);
       list;
       list = g_list_next (list))
    {
      GimpItem *item = list->data;
      gint      off_x;
      gint      off_y;

      gimp_item_get_offset (item, &off_x, &off_y);

      gimp_item_rotate (item, context, rotate_type, center_x, center_y, FALSE);

      gimp_image_rotate_item_offset (image, rotate_type, item, off_x, off_y);

      if (progress)
        gimp_progress_set_value (progress, progress_current++ / progress_max);
    }

  /*  Rotate all Guides  */
  gimp_image_rotate_guides (image, rotate_type);

  /*  Rotate all sample points  */
  gimp_image_rotate_sample_points (image, rotate_type);

  /*  Resize the image (if needed)  */
  if (size_changed)
    {
      gdouble xres;
      gdouble yres;

      gimp_image_undo_push_image_size (image,
                                       NULL,
                                       offset_x,
                                       offset_y,
                                       new_image_width,
                                       new_image_height);

      g_object_set (image,
                    "width",  new_image_width,
                    "height", new_image_height,
                    NULL);

      gimp_image_get_resolution (image, &xres, &yres);

      if (xres != yres)
        gimp_image_set_resolution (image, yres, xres);
    }

  gimp_image_undo_group_end (image);

  if (size_changed)
    gimp_image_size_changed_detailed (image,
                                      -offset_x,
                                      -offset_y,
                                      previous_image_width,
                                      previous_image_height);

  g_object_thaw_notify (G_OBJECT (image));

  gimp_unset_busy (image->gimp);
}
void
gimp_image_scale (GimpImage             *image,
                  gint                   new_width,
                  gint                   new_height,
                  GimpInterpolationType  interpolation_type,
                  GimpProgress          *progress)
{
    GimpProgress *sub_progress;
    GList        *all_layers;
    GList        *all_channels;
    GList        *all_vectors;
    GList        *list;
    gint          old_width;
    gint          old_height;
    gint          offset_x;
    gint          offset_y;
    gdouble       img_scale_w      = 1.0;
    gdouble       img_scale_h      = 1.0;
    gint          progress_steps;
    gint          progress_current = 0;

    g_return_if_fail (GIMP_IS_IMAGE (image));
    g_return_if_fail (new_width > 0 && new_height > 0);
    g_return_if_fail (progress == NULL || GIMP_IS_PROGRESS (progress));

    gimp_set_busy (image->gimp);

    sub_progress = gimp_sub_progress_new (progress);

    all_layers   = gimp_image_get_layer_list (image);
    all_channels = gimp_image_get_channel_list (image);
    all_vectors  = gimp_image_get_vectors_list (image);

    progress_steps = (g_list_length (all_layers)   +
                      g_list_length (all_channels) +
                      g_list_length (all_vectors)  +
                      1 /* selection */);

    g_object_freeze_notify (G_OBJECT (image));

    gimp_image_undo_group_start (image, GIMP_UNDO_GROUP_IMAGE_SCALE,
                                 C_("undo-type", "Scale Image"));

    old_width   = gimp_image_get_width  (image);
    old_height  = gimp_image_get_height (image);
    img_scale_w = (gdouble) new_width  / (gdouble) old_width;
    img_scale_h = (gdouble) new_height / (gdouble) old_height;

    offset_x = (old_width  - new_width)  / 2;
    offset_y = (old_height - new_height) / 2;

    /*  Push the image size to the stack  */
    gimp_image_undo_push_image_size (image,
                                     NULL,
                                     offset_x,
                                     offset_y,
                                     new_width,
                                     new_height);

    /*  Set the new width and height early, so below image item setters
     *  (esp. guides and sample points) don't choke about moving stuff
     *  out of the image
     */
    g_object_set (image,
                  "width",  new_width,
                  "height", new_height,
                  NULL);

    /*  Scale all channels  */
    for (list = all_channels; list; list = g_list_next (list))
    {
        GimpItem *item = list->data;

        gimp_sub_progress_set_step (GIMP_SUB_PROGRESS (sub_progress),
                                    progress_current++, progress_steps);

        gimp_item_scale (item,
                         new_width, new_height, 0, 0,
                         interpolation_type, sub_progress);
    }

    /*  Scale all vectors  */
    for (list = all_vectors; list; list = g_list_next (list))
    {
        GimpItem *item = list->data;

        gimp_sub_progress_set_step (GIMP_SUB_PROGRESS (sub_progress),
                                    progress_current++, progress_steps);

        gimp_item_scale (item,
                         new_width, new_height, 0, 0,
                         interpolation_type, sub_progress);
    }

    /*  Don't forget the selection mask!  */
    gimp_sub_progress_set_step (GIMP_SUB_PROGRESS (sub_progress),
                                progress_current++, progress_steps);

    gimp_item_scale (GIMP_ITEM (gimp_image_get_mask (image)),
                     new_width, new_height, 0, 0,
                     interpolation_type, sub_progress);

    /*  Scale all layers  */
    for (list = all_layers; list; list = g_list_next (list))
    {
        GimpItem *item = list->data;

        gimp_sub_progress_set_step (GIMP_SUB_PROGRESS (sub_progress),
                                    progress_current++, progress_steps);

        /*  group layers are updated automatically  */
        if (gimp_viewable_get_children (GIMP_VIEWABLE (item)))
        {
            gimp_group_layer_suspend_resize (GIMP_GROUP_LAYER (item), FALSE);
            continue;
        }

        if (! gimp_item_scale_by_factors (item,
                                          img_scale_w, img_scale_h,
                                          interpolation_type, sub_progress))
        {
            /* Since 0 < img_scale_w, img_scale_h, failure due to one or more
             * vanishing scaled layer dimensions. Implicit delete implemented
             * here. Upstream warning implemented in resize_check_layer_scaling(),
             * which offers the user the chance to bail out.
             */
            gimp_image_remove_layer (image, GIMP_LAYER (item), TRUE, NULL);
        }
    }

    for (list = all_layers; list; list = g_list_next (list))
        if (gimp_viewable_get_children (list->data))
            gimp_group_layer_resume_resize (list->data, FALSE);


    /*  Scale all Guides  */
    for (list = gimp_image_get_guides (image);
            list;
            list = g_list_next (list))
    {
        GimpGuide *guide    = list->data;
        gint       position = gimp_guide_get_position (guide);

        switch (gimp_guide_get_orientation (guide))
        {
        case GIMP_ORIENTATION_HORIZONTAL:
            gimp_image_move_guide (image, guide,
                                   (position * new_height) / old_height,
                                   TRUE);
            break;

        case GIMP_ORIENTATION_VERTICAL:
            gimp_image_move_guide (image, guide,
                                   (position * new_width) / old_width,
                                   TRUE);
            break;

        default:
            break;
        }
    }

    /*  Scale all sample points  */
    for (list = gimp_image_get_sample_points (image);
            list;
            list = g_list_next (list))
    {
        GimpSamplePoint *sample_point = list->data;

        gimp_image_move_sample_point (image, sample_point,
                                      sample_point->x * new_width  / old_width,
                                      sample_point->y * new_height / old_height,
                                      TRUE);
    }

    gimp_image_undo_group_end (image);

    g_list_free (all_layers);
    g_list_free (all_channels);
    g_list_free (all_vectors);

    g_object_unref (sub_progress);

    gimp_image_size_changed_detailed (image,
                                      -offset_x,
                                      -offset_y,
                                      old_width,
                                      old_height);

    g_object_thaw_notify (G_OBJECT (image));

    gimp_unset_busy (image->gimp);
}