C++ GIMP_IS_LAYER函數代碼示例

GimpUndo *
gimp_image_undo_push_layer_remove (GimpImage   *image,
                                   const gchar *undo_desc,
                                   GimpLayer   *layer,
                                   GimpLayer   *prev_parent,
                                   gint         prev_position,
                                   GimpLayer   *prev_layer)
{
  g_return_val_if_fail (GIMP_IS_IMAGE (image), NULL);
  g_return_val_if_fail (GIMP_IS_LAYER (layer), NULL);
  g_return_val_if_fail (gimp_item_is_attached (GIMP_ITEM (layer)), NULL);
  g_return_val_if_fail (prev_parent == NULL || GIMP_IS_LAYER (prev_parent),
                        NULL);
  g_return_val_if_fail (prev_layer == NULL || GIMP_IS_LAYER (prev_layer),
                        NULL);

  return gimp_image_undo_push (image, GIMP_TYPE_LAYER_UNDO,
                               GIMP_UNDO_LAYER_REMOVE, undo_desc,
                               GIMP_DIRTY_IMAGE_STRUCTURE,
                               "item",          layer,
                               "prev-parent",   prev_parent,
                               "prev-position", prev_position,
                               "prev-layer",    prev_layer,
                               NULL);
}

static void
gimp_layer_mask_prop_undo_constructed (GObject *object)
{
  GimpLayerMaskPropUndo *layer_mask_prop_undo;
  GimpLayer             *layer;

  layer_mask_prop_undo = GIMP_LAYER_MASK_PROP_UNDO (object);

  G_OBJECT_CLASS (parent_class)->constructed (object);

  g_assert (GIMP_IS_LAYER (GIMP_ITEM_UNDO (object)->item));

  layer = GIMP_LAYER (GIMP_ITEM_UNDO (object)->item);

  switch (GIMP_UNDO (object)->undo_type)
    {
    case GIMP_UNDO_LAYER_MASK_APPLY:
      layer_mask_prop_undo->apply = gimp_layer_get_apply_mask (layer);
      break;

    case GIMP_UNDO_LAYER_MASK_SHOW:
      layer_mask_prop_undo->show = gimp_layer_get_show_mask (layer);
      break;

    default:
      g_assert_not_reached ();
    }
}

static void
gimp_layer_prop_undo_constructed (GObject *object)
{
  GimpLayerPropUndo *layer_prop_undo = GIMP_LAYER_PROP_UNDO (object);
  GimpLayer         *layer;

  G_OBJECT_CLASS (parent_class)->constructed (object);

  g_assert (GIMP_IS_LAYER (GIMP_ITEM_UNDO (object)->item));

  layer = GIMP_LAYER (GIMP_ITEM_UNDO (object)->item);

  switch (GIMP_UNDO (object)->undo_type)
    {
    case GIMP_UNDO_LAYER_MODE:
      layer_prop_undo->mode = gimp_layer_get_mode (layer);
      break;

    case GIMP_UNDO_LAYER_OPACITY:
      layer_prop_undo->opacity = gimp_layer_get_opacity (layer);
      break;

    case GIMP_UNDO_LAYER_LOCK_ALPHA:
      layer_prop_undo->lock_alpha = gimp_layer_get_lock_alpha (layer);
      break;

    default:
      g_assert_not_reached ();
    }
}

void
floating_sel_remove (GimpLayer *layer)
{
  GimpImage *image;

  g_return_if_fail (GIMP_IS_LAYER (layer));
  g_return_if_fail (gimp_layer_is_floating_sel (layer));

  image = gimp_item_get_image (GIMP_ITEM (layer->fs.drawable));

  gimp_image_undo_group_start (image, GIMP_UNDO_GROUP_FS_REMOVE,
                               _("Remove Floating Selection"));

  /*  store the affected area from the drawable in the backing store  */
  floating_sel_relax (layer, TRUE);

  /*  Invalidate the preview of the obscured drawable.  We do this here
   *  because it will not be done until the floating selection is removed,
   *  at which point the obscured drawable's preview will not be declared
   *  invalid.
   */
  gimp_viewable_invalidate_preview (GIMP_VIEWABLE (layer));

  /*  remove the layer from the image  */
  gimp_image_remove_layer (image, layer);

  gimp_image_undo_group_end (image);
}

void
floating_sel_activate_drawable (GimpLayer *layer)
{
  GimpImage    *image;
  GimpDrawable *drawable;

  g_return_if_fail (GIMP_IS_LAYER (layer));
  g_return_if_fail (gimp_layer_is_floating_sel (layer));

  image = gimp_item_get_image (GIMP_ITEM (layer));

  drawable = gimp_layer_get_floating_sel_drawable (layer);

  /*  set the underlying drawable to active  */
  if (GIMP_IS_LAYER_MASK (drawable))
    {
      GimpLayerMask *mask = GIMP_LAYER_MASK (drawable);

      gimp_image_set_active_layer (image, gimp_layer_mask_get_layer (mask));
    }
  else if (GIMP_IS_CHANNEL (drawable))
    {
      gimp_image_set_active_channel (image, GIMP_CHANNEL (drawable));
    }
  else
    {
      gimp_image_set_active_layer (image, GIMP_LAYER (drawable));
    }
}

void
floating_sel_anchor (GimpLayer *layer)
{
  GimpImage    *image;
  GimpDrawable *drawable;
  GimpFilter   *filter = NULL;
  gint          off_x, off_y;
  gint          dr_off_x, dr_off_y;

  g_return_if_fail (GIMP_IS_LAYER (layer));
  g_return_if_fail (gimp_layer_is_floating_sel (layer));

  /* Don't let gimp_image_remove_layer free the layer while we still need it */
  g_object_ref (layer);

  image = gimp_item_get_image (GIMP_ITEM (layer));

  gimp_image_undo_group_start (image, GIMP_UNDO_GROUP_FS_ANCHOR,
                               C_("undo-type", "Anchor Floating Selection"));

  drawable = gimp_layer_get_floating_sel_drawable (layer);

  gimp_item_get_offset (GIMP_ITEM (layer), &off_x, &off_y);
  gimp_item_get_offset (GIMP_ITEM (drawable), &dr_off_x, &dr_off_y);

  if (gimp_item_get_visible (GIMP_ITEM (layer)) &&
      gimp_rectangle_intersect (off_x, off_y,
                                gimp_item_get_width  (GIMP_ITEM (layer)),
                                gimp_item_get_height (GIMP_ITEM (layer)),
                                dr_off_x, dr_off_y,
                                gimp_item_get_width  (GIMP_ITEM (drawable)),
                                gimp_item_get_height (GIMP_ITEM (drawable)),
                                NULL, NULL, NULL, NULL))
    {
      filter = gimp_drawable_get_floating_sel_filter (drawable);
      g_object_ref (filter);
    }

  /*  first remove the filter, then merge it, or we will get warnings
   *  about already connected nodes
   */
  gimp_image_remove_layer (image, layer, TRUE, NULL);

  if (filter)
    {
      gimp_drawable_merge_filter (drawable, filter, NULL, NULL);
      g_object_unref (filter);
    }

  gimp_image_undo_group_end (image);

  /*  invalidate the boundaries  */
  gimp_drawable_invalidate_boundary (GIMP_DRAWABLE (gimp_image_get_mask (image)));

  g_object_unref (layer);
}

static void
gimp_display_shell_drop_drawable (GtkWidget    *widget,
                                  gint          x,
                                  gint          y,
                                  GimpViewable *viewable,
                                  gpointer      data)
{
  GimpDisplayShell *shell     = GIMP_DISPLAY_SHELL (data);
  GimpImage        *image     = gimp_display_get_image (shell->display);
  GType             new_type;
  GimpItem         *new_item;

  GIMP_LOG (DND, NULL);

  if (shell->display->gimp->busy)
    return;

  if (! image)
    {
      image = gimp_image_new_from_drawable (shell->display->gimp,
                                            GIMP_DRAWABLE (viewable));
      gimp_create_display (shell->display->gimp, image, GIMP_UNIT_PIXEL, 1.0,
                           G_OBJECT (gtk_widget_get_screen (widget)),
                           gimp_widget_get_monitor (widget));
      g_object_unref (image);

      return;
    }

  if (GIMP_IS_LAYER (viewable))
    new_type = G_TYPE_FROM_INSTANCE (viewable);
  else
    new_type = GIMP_TYPE_LAYER;

  new_item = gimp_item_convert (GIMP_ITEM (viewable), image, new_type);

  if (new_item)
    {
      GimpLayer *new_layer = GIMP_LAYER (new_item);

      gimp_image_undo_group_start (image, GIMP_UNDO_GROUP_EDIT_PASTE,
                                   _("Drop New Layer"));

      gimp_display_shell_dnd_position_item (shell, image, new_item);

      gimp_item_set_visible (new_item, TRUE, FALSE);
      gimp_item_set_linked (new_item, FALSE, FALSE);

      gimp_image_add_layer (image, new_layer,
                            GIMP_IMAGE_ACTIVE_PARENT, -1, TRUE);

      gimp_image_undo_group_end (image);

      gimp_display_shell_dnd_flush (shell, image);
    }
}

void
floating_sel_to_layer (GimpLayer *layer)
{
  GimpItem  *item;
  GimpImage *image;

  g_return_if_fail (GIMP_IS_LAYER (layer));
  g_return_if_fail (gimp_layer_is_floating_sel (layer));

  item = GIMP_ITEM (layer);

  if (! (image = gimp_item_get_image (item)))
    return;

  /*  Check if the floating layer belongs to a channel...  */
  if (GIMP_IS_CHANNEL (layer->fs.drawable))
    {
      gimp_message (image->gimp, NULL, GIMP_MESSAGE_WARNING,
                    _("Cannot create a new layer from the floating selection "
                      "because it belongs to a layer mask or channel."));
      return;
    }

  gimp_image_undo_group_start (image, GIMP_UNDO_GROUP_FS_TO_LAYER,
                               _("Floating Selection to Layer"));

  /*  restore the contents of the drawable  */
  floating_sel_restore (layer,
                        item->offset_x,
                        item->offset_y,
                        item->width,
                        item->height);

  gimp_image_undo_push_fs_to_layer (image, NULL, layer);

  /*  clear the selection  */
  gimp_drawable_invalidate_boundary (GIMP_DRAWABLE (layer));

  /*  Set pointers  */
  layer->fs.drawable   = NULL;
  image->floating_sel = NULL;

  gimp_item_set_visible (GIMP_ITEM (layer), TRUE, TRUE);
  gimp_layer_set_lock_alpha (layer, FALSE, TRUE);

  gimp_image_undo_group_end (image);

  gimp_object_name_changed (GIMP_OBJECT (layer));

  gimp_drawable_update (GIMP_DRAWABLE (layer),
                        0, 0,
                        GIMP_ITEM (layer)->width,
                        GIMP_ITEM (layer)->height);

  gimp_image_floating_selection_changed (image);
}

GimpDrawable *
gimp_drawable_transform_paste (GimpDrawable     *drawable,
                               GeglBuffer       *buffer,
                               GimpColorProfile *buffer_profile,
                               gint              offset_x,
                               gint              offset_y,
                               gboolean          new_layer)
{
  GimpImage   *image;
  GimpLayer   *layer     = NULL;
  const gchar *undo_desc = NULL;

  g_return_val_if_fail (GIMP_IS_DRAWABLE (drawable), NULL);
  g_return_val_if_fail (gimp_item_is_attached (GIMP_ITEM (drawable)), NULL);
  g_return_val_if_fail (GEGL_IS_BUFFER (buffer), NULL);
  g_return_val_if_fail (GIMP_IS_COLOR_PROFILE (buffer_profile), NULL);

  image = gimp_item_get_image (GIMP_ITEM (drawable));

  if (GIMP_IS_LAYER (drawable))
    undo_desc = C_("undo-type", "Transform Layer");
  else if (GIMP_IS_CHANNEL (drawable))
    undo_desc = C_("undo-type", "Transform Channel");
  else
    return NULL;

  gimp_image_undo_group_start (image, GIMP_UNDO_GROUP_EDIT_PASTE, undo_desc);

  if (new_layer)
    {
      layer =
        gimp_layer_new_from_gegl_buffer (buffer, image,
                                         gimp_drawable_get_format_with_alpha (drawable),
                                         _("Transformation"),
                                         GIMP_OPACITY_OPAQUE,
                                         gimp_image_get_default_new_layer_mode (image),
                                         buffer_profile);

      gimp_item_set_offset (GIMP_ITEM (layer), offset_x, offset_y);

      floating_sel_attach (layer, drawable);

      drawable = GIMP_DRAWABLE (layer);
    }
  else
    {
      gimp_drawable_set_buffer_full (drawable, TRUE, NULL,
                                     buffer,
                                     offset_x, offset_y,
                                     TRUE);
    }

  gimp_image_undo_group_end (image);

  return drawable;
}

static void
gimp_layer_mask_undo_constructed (GObject *object)
{
  GimpLayerMaskUndo *layer_mask_undo = GIMP_LAYER_MASK_UNDO (object);

  G_OBJECT_CLASS (parent_class)->constructed (object);

  g_assert (GIMP_IS_LAYER (GIMP_ITEM_UNDO (object)->item));
  g_assert (GIMP_IS_LAYER_MASK (layer_mask_undo->layer_mask));
}

GimpUndo *
gimp_image_undo_push_layer_add (GimpImage   *image,
                                const gchar *undo_desc,
                                GimpLayer   *layer,
                                GimpLayer   *prev_layer)
{
  g_return_val_if_fail (GIMP_IS_IMAGE (image), NULL);
  g_return_val_if_fail (GIMP_IS_LAYER (layer), NULL);
  g_return_val_if_fail (! gimp_item_is_attached (GIMP_ITEM (layer)), NULL);
  g_return_val_if_fail (prev_layer == NULL || GIMP_IS_LAYER (prev_layer),
                        NULL);

  return gimp_image_undo_push (image, GIMP_TYPE_LAYER_UNDO,
                               GIMP_UNDO_LAYER_ADD, undo_desc,
                               GIMP_DIRTY_IMAGE_STRUCTURE,
                               "item",       layer,
                               "prev-layer", prev_layer,
                               NULL);
}

static gboolean
gimp_layer_mask_is_attached (const GimpItem *item)
{
  GimpLayerMask *mask  = GIMP_LAYER_MASK (item);
  GimpLayer     *layer = gimp_layer_mask_get_layer (mask);

  return (GIMP_IS_IMAGE (gimp_item_get_image (item)) &&
          GIMP_IS_LAYER (layer)                      &&
          gimp_layer_get_mask (layer) == mask        &&
          gimp_item_is_attached (GIMP_ITEM (layer)));
}

void
floating_sel_invalidate (GimpLayer *layer)
{
  g_return_if_fail (GIMP_IS_LAYER (layer));
  g_return_if_fail (gimp_layer_is_floating_sel (layer));

  /*  Invalidate the attached-to drawable's preview  */
  gimp_viewable_invalidate_preview (GIMP_VIEWABLE (gimp_layer_get_floating_sel_drawable (layer)));

  /*  Invalidate the boundary  */
  layer->fs.boundary_known = FALSE;
}

gboolean
gimp_text_layer_xcf_load_hack (GimpLayer **layer)
{
  const gchar        *name;
  GimpText           *text = NULL;
  const GimpParasite *parasite;

  g_return_val_if_fail (layer != NULL, FALSE);
  g_return_val_if_fail (GIMP_IS_LAYER (*layer), FALSE);

  name = gimp_text_parasite_name ();
  parasite = gimp_item_parasite_find (GIMP_ITEM (*layer), name);

  if (parasite)
    {
      GError *error = NULL;

      text = gimp_text_from_parasite (parasite, &error);

      if (error)
        {
          gimp_message (gimp_item_get_image (GIMP_ITEM (*layer))->gimp, NULL,
                        GIMP_MESSAGE_ERROR,
                        _("Problems parsing the text parasite for layer '%s':\n"
                          "%s\n\n"
                          "Some text properties may be wrong. "
                          "Unless you want to edit the text layer, "
                          "you don't need to worry about this."),
                        gimp_object_get_name (*layer),
                        error->message);
          g_clear_error (&error);
        }
    }
  else
    {
      name = gimp_text_gdyntext_parasite_name ();

      parasite = gimp_item_parasite_find (GIMP_ITEM (*layer), name);

      if (parasite)
        text = gimp_text_from_gdyntext_parasite (parasite);
    }

  if (text)
    {
      *layer = gimp_text_layer_from_layer (*layer, text);

      /*  let the text layer knows what parasite was used to create it  */
      GIMP_TEXT_LAYER (*layer)->text_parasite = name;
    }

  return (text != NULL);
}

gboolean
floating_sel_to_layer (GimpLayer  *layer,
                       GError    **error)
{
  GimpItem  *item;
  GimpImage *image;

  g_return_val_if_fail (GIMP_IS_LAYER (layer), FALSE);
  g_return_val_if_fail (gimp_layer_is_floating_sel (layer), FALSE);
  g_return_val_if_fail (error == NULL || *error == NULL, FALSE);

  item  = GIMP_ITEM (layer);
  image = gimp_item_get_image (item);

  /*  Check if the floating layer belongs to a channel  */
  if (GIMP_IS_CHANNEL (gimp_layer_get_floating_sel_drawable (layer)))
    {
      g_set_error_literal (error, GIMP_ERROR, GIMP_FAILED,
			   _("Cannot create a new layer from the floating "
			     "selection because it belongs to a layer mask "
			     "or channel."));
      return FALSE;
    }

  gimp_image_undo_group_start (image, GIMP_UNDO_GROUP_FS_TO_LAYER,
                               C_("undo-type", "Floating Selection to Layer"));

  gimp_image_undo_push_fs_to_layer (image, NULL, layer);

  gimp_drawable_detach_floating_sel (gimp_layer_get_floating_sel_drawable (layer));
  gimp_layer_set_floating_sel_drawable (layer, NULL);

  gimp_item_set_visible (item, TRUE, TRUE);
  gimp_layer_set_lock_alpha (layer, FALSE, TRUE);

  gimp_image_undo_group_end (image);

  /* When the floating selection is converted to/from a normal layer
   * it does something resembling a name change, so emit the
   * "name-changed" signal
   */
  gimp_object_name_changed (GIMP_OBJECT (layer));

  gimp_drawable_update (GIMP_DRAWABLE (layer),
                        0, 0,
                        gimp_item_get_width  (item),
                        gimp_item_get_height (item));

  return TRUE;
}