Adding upstream version 2.10.36.upstream/2.10.36

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 787 insertions, 0 deletions

diff --git a/app/tools/gimpoffsettool.c b/app/tools/gimpoffsettool.c
new file mode 100644
index 0000000..8a17fd3
--- /dev/null
+++ b/app/tools/gimpoffsettool.c
@@ -0,0 +1,787 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <string.h>
+
+#include <gegl.h>
+#include <gtk/gtk.h>
+
+#include "libgimpmath/gimpmath.h"
+#include "libgimpwidgets/gimpwidgets.h"
+
+#include "tools-types.h"
+
+#include "core/gimpchannel.h"
+#include "core/gimpdrawable.h"
+#include "core/gimpdrawablefilter.h"
+#include "core/gimpimage.h"
+#include "core/gimplayer.h"
+#include "core/gimplayermask.h"
+
+#include "widgets/gimphelp-ids.h"
+
+#include "display/gimpdisplay.h"
+#include "display/gimptoolgui.h"
+
+#include "gimpoffsettool.h"
+#include "gimpfilteroptions.h"
+#include "gimptoolcontrol.h"
+
+#include "gimp-intl.h"
+
+
+static gboolean   gimp_offset_tool_initialize            (GimpTool              *tool,
+                                                          GimpDisplay           *display,
+                                                          GError               **error);
+static void       gimp_offset_tool_control               (GimpTool              *tool,
+                                                          GimpToolAction         action,
+                                                          GimpDisplay           *display);
+static void       gimp_offset_tool_button_press          (GimpTool              *tool,
+                                                          const GimpCoords      *coords,
+                                                          guint32                time,
+                                                          GdkModifierType        state,
+                                                          GimpButtonPressType    press_type,
+                                                          GimpDisplay           *display);
+static void       gimp_offset_tool_button_release        (GimpTool              *tool,
+                                                          const GimpCoords      *coords,
+                                                          guint32                time,
+                                                          GdkModifierType        state,
+                                                          GimpButtonReleaseType  release_type,
+                                                          GimpDisplay           *display);
+static void       gimp_offset_tool_motion                (GimpTool              *tool,
+                                                          const GimpCoords      *coords,
+                                                          guint32                time,
+                                                          GdkModifierType        state,
+                                                          GimpDisplay           *display);
+static void       gimp_offset_tool_oper_update           (GimpTool              *tool,
+                                                          const GimpCoords      *coords,
+                                                          GdkModifierType        state,
+                                                          gboolean               proximity,
+                                                          GimpDisplay           *display);
+static void       gimp_offset_tool_cursor_update         (GimpTool              *tool,
+                                                          const GimpCoords      *coords,
+                                                          GdkModifierType        state,
+                                                          GimpDisplay           *display);
+
+static gchar    * gimp_offset_tool_get_operation         (GimpFilterTool        *filter_tool,
+                                                          gchar                **description);
+static void       gimp_offset_tool_dialog                (GimpFilterTool        *filter_tool);
+static void       gimp_offset_tool_config_notify         (GimpFilterTool        *filter_tool,
+                                                          GimpConfig            *config,
+                                                          const GParamSpec      *pspec);
+static void       gimp_offset_tool_region_changed        (GimpFilterTool        *filter_tool);
+
+static void       gimp_offset_tool_offset_changed        (GimpSizeEntry         *se,
+                                                          GimpOffsetTool        *offset_tool);
+
+static void       gimp_offset_tool_half_xy_clicked       (GtkButton             *button,
+                                                          GimpOffsetTool        *offset_tool);
+static void       gimp_offset_tool_half_x_clicked        (GtkButton             *button,
+                                                          GimpOffsetTool        *offset_tool);
+static void       gimp_offset_tool_half_y_clicked        (GtkButton             *button,
+                                                          GimpOffsetTool        *offset_tool);
+
+static void       gimp_offset_tool_edge_behavior_toggled (GtkToggleButton       *toggle,
+                                                          GimpOffsetTool        *offset_tool);
+
+static void       gimp_offset_tool_background_changed    (GimpContext           *context,
+                                                          const GimpRGB         *color,
+                                                          GimpOffsetTool        *offset_tool);
+
+static gint       gimp_offset_tool_get_width             (GimpOffsetTool        *offset_tool);
+static gint       gimp_offset_tool_get_height            (GimpOffsetTool        *offset_tool);
+
+static void       gimp_offset_tool_update                (GimpOffsetTool        *offset_tool);
+
+static void       gimp_offset_tool_halt                  (GimpOffsetTool        *offset_tool);
+
+
+G_DEFINE_TYPE (GimpOffsetTool, gimp_offset_tool,
+               GIMP_TYPE_FILTER_TOOL)
+
+#define parent_class gimp_offset_tool_parent_class
+
+
+void
+gimp_offset_tool_register (GimpToolRegisterCallback callback,
+                           gpointer                 data)
+{
+  (* callback) (GIMP_TYPE_OFFSET_TOOL,
+                GIMP_TYPE_FILTER_OPTIONS, NULL,
+                GIMP_CONTEXT_PROP_MASK_BACKGROUND,
+                "gimp-offset-tool",
+                _("Offset"),
+                _("Shift the pixels, optionally wrapping them at the borders"),
+                N_("_Offset..."), NULL,
+                NULL, GIMP_HELP_TOOL_OFFSET,
+                GIMP_ICON_TOOL_OFFSET,
+                data);
+}
+
+static void
+gimp_offset_tool_class_init (GimpOffsetToolClass *klass)
+{
+  GimpToolClass       *tool_class        = GIMP_TOOL_CLASS (klass);
+  GimpFilterToolClass *filter_tool_class = GIMP_FILTER_TOOL_CLASS (klass);
+
+  tool_class->initialize            = gimp_offset_tool_initialize;
+  tool_class->control               = gimp_offset_tool_control;
+  tool_class->button_press          = gimp_offset_tool_button_press;
+  tool_class->button_release        = gimp_offset_tool_button_release;
+  tool_class->motion                = gimp_offset_tool_motion;
+  tool_class->oper_update           = gimp_offset_tool_oper_update;
+  tool_class->cursor_update         = gimp_offset_tool_cursor_update;
+
+  filter_tool_class->get_operation  = gimp_offset_tool_get_operation;
+  filter_tool_class->dialog         = gimp_offset_tool_dialog;
+  filter_tool_class->config_notify  = gimp_offset_tool_config_notify;
+  filter_tool_class->region_changed = gimp_offset_tool_region_changed;
+}
+
+static void
+gimp_offset_tool_init (GimpOffsetTool *offset_tool)
+{
+  GimpTool *tool = GIMP_TOOL (offset_tool);
+
+  gimp_tool_control_set_scroll_lock (tool->control, TRUE);
+  gimp_tool_control_set_precision   (tool->control,
+                                     GIMP_CURSOR_PRECISION_PIXEL_CENTER);
+}
+
+static gboolean
+gimp_offset_tool_initialize (GimpTool     *tool,
+                             GimpDisplay  *display,
+                             GError      **error)
+{
+  GimpFilterTool *filter_tool = GIMP_FILTER_TOOL (tool);
+  GimpOffsetTool *offset_tool = GIMP_OFFSET_TOOL (tool);
+  GimpContext    *context     = GIMP_CONTEXT (GIMP_TOOL_GET_OPTIONS (tool));
+  GimpImage      *image;
+  gdouble         xres;
+  gdouble         yres;
+
+  if (! GIMP_TOOL_CLASS (parent_class)->initialize (tool, display, error))
+    return FALSE;
+
+  image = gimp_item_get_image (GIMP_ITEM (tool->drawable));
+
+  gimp_image_get_resolution (image, &xres, &yres);
+
+  g_signal_handlers_block_by_func (offset_tool->offset_se,
+                                   gimp_offset_tool_offset_changed,
+                                   offset_tool);
+
+  gimp_size_entry_set_resolution (
+    GIMP_SIZE_ENTRY (offset_tool->offset_se), 0,
+    xres, FALSE);
+  gimp_size_entry_set_resolution (
+    GIMP_SIZE_ENTRY (offset_tool->offset_se), 1,
+    yres, FALSE);
+
+  if (GIMP_IS_LAYER (tool->drawable))
+    gimp_tool_gui_set_description (filter_tool->gui, _("Offset Layer"));
+  else if (GIMP_IS_LAYER_MASK (tool->drawable))
+    gimp_tool_gui_set_description (filter_tool->gui, _("Offset Layer Mask"));
+  else if (GIMP_IS_CHANNEL (tool->drawable))
+    gimp_tool_gui_set_description (filter_tool->gui, _("Offset Channel"));
+  else
+    g_warning ("%s: unexpected drawable type", G_STRFUNC);
+
+  gtk_widget_set_sensitive (offset_tool->transparent_radio,
+                            gimp_drawable_has_alpha (tool->drawable));
+
+  g_signal_handlers_unblock_by_func (offset_tool->offset_se,
+                                     gimp_offset_tool_offset_changed,
+                                     offset_tool);
+
+  gegl_node_set (
+    filter_tool->operation,
+    "context", context,
+    NULL);
+
+  g_signal_connect (context, "background-changed",
+                    G_CALLBACK (gimp_offset_tool_background_changed),
+                    offset_tool);
+
+  gimp_offset_tool_update (offset_tool);
+
+  return TRUE;
+}
+
+static void
+gimp_offset_tool_control (GimpTool       *tool,
+                          GimpToolAction  action,
+                          GimpDisplay    *display)
+{
+  GimpOffsetTool *offset_tool = GIMP_OFFSET_TOOL (tool);
+
+  switch (action)
+    {
+    case GIMP_TOOL_ACTION_PAUSE:
+    case GIMP_TOOL_ACTION_RESUME:
+      break;
+
+    case GIMP_TOOL_ACTION_HALT:
+      gimp_offset_tool_halt (offset_tool);
+      break;
+
+    case GIMP_TOOL_ACTION_COMMIT:
+      break;
+    }
+
+  GIMP_TOOL_CLASS (parent_class)->control (tool, action, display);
+}
+
+static gchar *
+gimp_offset_tool_get_operation (GimpFilterTool  *filter_tool,
+                                gchar          **description)
+{
+  return g_strdup ("gimp:offset");
+}
+
+static void
+gimp_offset_tool_button_press (GimpTool            *tool,
+                               const GimpCoords    *coords,
+                               guint32              time,
+                               GdkModifierType      state,
+                               GimpButtonPressType  press_type,
+                               GimpDisplay         *display)
+{
+  GimpOffsetTool *offset_tool = GIMP_OFFSET_TOOL (tool);
+
+  offset_tool->dragging = ! gimp_filter_tool_on_guide (GIMP_FILTER_TOOL (tool),
+                                                       coords, display);
+
+  if (! offset_tool->dragging)
+    {
+      GIMP_TOOL_CLASS (parent_class)->button_press (tool, coords, time, state,
+                                                    press_type, display);
+    }
+  else
+    {
+      offset_tool->x = coords->x;
+      offset_tool->y = coords->y;
+
+      g_object_get (GIMP_FILTER_TOOL (tool)->config,
+                    "x", &offset_tool->offset_x,
+                    "y", &offset_tool->offset_y,
+                    NULL);
+
+      tool->display = display;
+
+      gimp_tool_control_activate (tool->control);
+
+      gimp_tool_pop_status (tool, display);
+
+      gimp_tool_push_status_coords (tool, display,
+                                    GIMP_CURSOR_PRECISION_PIXEL_CENTER,
+                                    _("Offset: "),
+                                    0,
+                                    ", ",
+                                    0,
+                                    NULL);
+    }
+}
+
+static void
+gimp_offset_tool_button_release (GimpTool              *tool,
+                                 const GimpCoords      *coords,
+                                 guint32                time,
+                                 GdkModifierType        state,
+                                 GimpButtonReleaseType  release_type,
+                                 GimpDisplay           *display)
+{
+  GimpOffsetTool *offset_tool = GIMP_OFFSET_TOOL (tool);
+
+  if (! offset_tool->dragging)
+    {
+      GIMP_TOOL_CLASS (parent_class)->button_release (tool, coords, time, state,
+                                                      release_type, display);
+    }
+  else
+    {
+      gimp_tool_control_halt (tool->control);
+
+      offset_tool->dragging = FALSE;
+
+      if (release_type == GIMP_BUTTON_RELEASE_CANCEL)
+        {
+          g_object_set (GIMP_FILTER_TOOL (tool)->config,
+                        "x", offset_tool->offset_x,
+                        "y", offset_tool->offset_y,
+                        NULL);
+        }
+    }
+}
+
+static void
+gimp_offset_tool_motion (GimpTool         *tool,
+                         const GimpCoords *coords,
+                         guint32           time,
+                         GdkModifierType   state,
+                         GimpDisplay      *display)
+{
+  GimpFilterTool *filter_tool = GIMP_FILTER_TOOL (tool);
+  GimpOffsetTool *offset_tool = GIMP_OFFSET_TOOL (tool);
+
+  if (! offset_tool->dragging)
+    {
+      GIMP_TOOL_CLASS (parent_class)->motion (tool, coords, time, state,
+                                              display);
+    }
+  else
+    {
+      GimpOffsetType type;
+      gint           offset_x;
+      gint           offset_y;
+      gint           x;
+      gint           y;
+      gint           width;
+      gint           height;
+
+      g_object_get (filter_tool->config,
+                    "type", &type,
+                    NULL);
+
+      offset_x = RINT (coords->x - offset_tool->x);
+      offset_y = RINT (coords->y - offset_tool->y);
+
+      x = offset_tool->offset_x + offset_x;
+      y = offset_tool->offset_y + offset_y;
+
+      width  = gimp_offset_tool_get_width  (offset_tool);
+      height = gimp_offset_tool_get_height (offset_tool);
+
+      if (type == GIMP_OFFSET_WRAP_AROUND)
+        {
+          x %= MAX (width,  1);
+          y %= MAX (height, 1);
+        }
+      else
+        {
+          x = CLAMP (x, -width,  +width);
+          y = CLAMP (y, -height, +height);
+        }
+
+      g_object_set (filter_tool->config,
+                    "x", x,
+                    "y", y,
+                    NULL);
+
+      gimp_tool_pop_status (tool, display);
+
+      gimp_tool_push_status_coords (tool, display,
+                                    GIMP_CURSOR_PRECISION_PIXEL_CENTER,
+                                    _("Offset: "),
+                                    offset_x,
+                                    ", ",
+                                    offset_y,
+                                    NULL);
+    }
+}
+
+static void
+gimp_offset_tool_oper_update (GimpTool         *tool,
+                              const GimpCoords *coords,
+                              GdkModifierType   state,
+                              gboolean          proximity,
+                              GimpDisplay      *display)
+{
+  if (! tool->drawable ||
+      gimp_filter_tool_on_guide (GIMP_FILTER_TOOL (tool),
+                                 coords, display))
+    {
+      GIMP_TOOL_CLASS (parent_class)->oper_update (tool, coords, state,
+                                                   proximity, display);
+    }
+  else
+    {
+      gimp_tool_pop_status (tool, display);
+
+      gimp_tool_push_status (tool, display, "%s",
+                             _("Click-Drag to offset drawable"));
+    }
+}
+
+static void
+gimp_offset_tool_cursor_update (GimpTool         *tool,
+                                const GimpCoords *coords,
+                                GdkModifierType   state,
+                                GimpDisplay      *display)
+{
+  if (! tool->drawable ||
+      gimp_filter_tool_on_guide (GIMP_FILTER_TOOL (tool),
+                                 coords, display))
+    {
+      GIMP_TOOL_CLASS (parent_class)->cursor_update (tool, coords, state,
+                                                     display);
+    }
+  else
+    {
+      gimp_tool_set_cursor (tool, display,
+                            GIMP_CURSOR_MOUSE,
+                            GIMP_TOOL_CURSOR_MOVE,
+                            GIMP_CURSOR_MODIFIER_NONE);
+    }
+}
+
+static void
+gimp_offset_tool_dialog (GimpFilterTool *filter_tool)
+{
+  GimpOffsetTool *offset_tool = GIMP_OFFSET_TOOL (filter_tool);
+  GtkWidget      *main_vbox;
+  GtkWidget      *vbox;
+  GtkWidget      *hbox;
+  GtkWidget      *button;
+  GtkWidget      *spinbutton;
+  GtkWidget      *frame;
+  GtkAdjustment  *adjustment;
+
+  main_vbox = gimp_filter_tool_dialog_get_vbox (filter_tool);
+
+  /*  The offset frame  */
+  frame = gimp_frame_new (_("Offset"));
+  gtk_box_pack_start (GTK_BOX (main_vbox), frame, FALSE, FALSE, 0);
+  gtk_widget_show (frame);
+
+  vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 6);
+  gtk_container_add (GTK_CONTAINER (frame), vbox);
+  gtk_widget_show (vbox);
+
+  adjustment = (GtkAdjustment *)
+    gtk_adjustment_new (1, 1, 1, 1, 10, 0);
+  spinbutton = gimp_spin_button_new (adjustment, 1.0, 2);
+  gtk_spin_button_set_numeric (GTK_SPIN_BUTTON (spinbutton), TRUE);
+  gtk_entry_set_width_chars (GTK_ENTRY (spinbutton), 10);
+
+  offset_tool->offset_se = gimp_size_entry_new (1, GIMP_UNIT_PIXEL, "%a",
+                                                TRUE, TRUE, FALSE, 10,
+                                                GIMP_SIZE_ENTRY_UPDATE_SIZE);
+
+  gtk_table_set_col_spacing (GTK_TABLE (offset_tool->offset_se), 0, 4);
+  gtk_table_set_col_spacing (GTK_TABLE (offset_tool->offset_se), 1, 4);
+  gtk_table_set_row_spacing (GTK_TABLE (offset_tool->offset_se), 0, 2);
+
+  gimp_size_entry_add_field (GIMP_SIZE_ENTRY (offset_tool->offset_se),
+                             GTK_SPIN_BUTTON (spinbutton), NULL);
+  gtk_table_attach_defaults (GTK_TABLE (offset_tool->offset_se), spinbutton,
+                             1, 2, 0, 1);
+  gtk_widget_show (spinbutton);
+
+  gimp_size_entry_attach_label (GIMP_SIZE_ENTRY (offset_tool->offset_se),
+                                _("_X:"), 0, 0, 0.0);
+  gimp_size_entry_attach_label (GIMP_SIZE_ENTRY (offset_tool->offset_se),
+                                _("_Y:"), 1, 0, 0.0);
+
+  gtk_box_pack_start (GTK_BOX (vbox), offset_tool->offset_se, FALSE, FALSE, 0);
+  gtk_widget_show (offset_tool->offset_se);
+
+  gimp_size_entry_set_unit (GIMP_SIZE_ENTRY (offset_tool->offset_se),
+                            GIMP_UNIT_PIXEL);
+
+  g_signal_connect (offset_tool->offset_se, "refval-changed",
+                    G_CALLBACK (gimp_offset_tool_offset_changed),
+                    offset_tool);
+  g_signal_connect (offset_tool->offset_se, "value-changed",
+                    G_CALLBACK (gimp_offset_tool_offset_changed),
+                    offset_tool);
+
+  button = gtk_button_new_with_mnemonic (_("By width/_2, height/2"));
+  gtk_box_pack_start (GTK_BOX (vbox), button, FALSE, FALSE, 0);
+  gtk_widget_show (button);
+
+  g_signal_connect (button, "clicked",
+                    G_CALLBACK (gimp_offset_tool_half_xy_clicked),
+                    offset_tool);
+
+  hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 6);
+  gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
+  gtk_widget_show (hbox);
+
+  button = gtk_button_new_with_mnemonic (_("By _width/2"));
+  gtk_box_pack_start (GTK_BOX (hbox), button, TRUE, TRUE, 0);
+  gtk_widget_show (button);
+
+  g_signal_connect (button, "clicked",
+                    G_CALLBACK (gimp_offset_tool_half_x_clicked),
+                    offset_tool);
+
+  button = gtk_button_new_with_mnemonic (_("By _height/2"));
+  gtk_box_pack_start (GTK_BOX (hbox), button, TRUE, TRUE, 0);
+  gtk_widget_show (button);
+
+  g_signal_connect (button, "clicked",
+                    G_CALLBACK (gimp_offset_tool_half_y_clicked),
+                    offset_tool);
+
+  /*  The edge behavior frame  */
+  frame = gimp_int_radio_group_new (TRUE, _("Edge Behavior"),
+
+                                    G_CALLBACK (gimp_offset_tool_edge_behavior_toggled),
+                                    offset_tool,
+
+                                    GIMP_OFFSET_WRAP_AROUND,
+
+                                    _("W_rap around"),
+                                    GIMP_OFFSET_WRAP_AROUND, NULL,
+
+                                    _("Fill with _background color"),
+                                    GIMP_OFFSET_BACKGROUND, NULL,
+
+                                    _("Make _transparent"),
+                                    GIMP_OFFSET_TRANSPARENT,
+                                    &offset_tool->transparent_radio,
+                                    NULL);
+
+  gtk_box_pack_start (GTK_BOX (main_vbox), frame, FALSE, FALSE, 0);
+  gtk_widget_show (frame);
+}
+
+static void
+gimp_offset_tool_config_notify (GimpFilterTool   *filter_tool,
+                                GimpConfig       *config,
+                                const GParamSpec *pspec)
+{
+  gimp_offset_tool_update (GIMP_OFFSET_TOOL (filter_tool));
+
+  GIMP_FILTER_TOOL_CLASS (parent_class)->config_notify (filter_tool,
+                                                        config, pspec);
+}
+
+static void
+gimp_offset_tool_region_changed (GimpFilterTool *filter_tool)
+{
+  gimp_offset_tool_update (GIMP_OFFSET_TOOL (filter_tool));
+}
+
+static void
+gimp_offset_tool_offset_changed (GimpSizeEntry  *se,
+                                 GimpOffsetTool *offset_tool)
+{
+  g_object_set (GIMP_FILTER_TOOL (offset_tool)->config,
+                "x", (gint) gimp_size_entry_get_refval (se, 0),
+                "y", (gint) gimp_size_entry_get_refval (se, 1),
+                NULL);
+}
+
+static void
+gimp_offset_tool_half_xy_clicked (GtkButton      *button,
+                                  GimpOffsetTool *offset_tool)
+{
+  g_object_set (GIMP_FILTER_TOOL (offset_tool)->config,
+                "x", gimp_offset_tool_get_width  (offset_tool) / 2,
+                "y", gimp_offset_tool_get_height (offset_tool) / 2,
+                NULL);
+}
+
+static void
+gimp_offset_tool_half_x_clicked (GtkButton      *button,
+                                 GimpOffsetTool *offset_tool)
+{
+  g_object_set (GIMP_FILTER_TOOL (offset_tool)->config,
+                "x", gimp_offset_tool_get_width (offset_tool) / 2,
+                NULL);
+}
+
+static void
+gimp_offset_tool_half_y_clicked (GtkButton      *button,
+                                 GimpOffsetTool *offset_tool)
+{
+  g_object_set (GIMP_FILTER_TOOL (offset_tool)->config,
+                "y", gimp_offset_tool_get_height (offset_tool) / 2,
+                NULL);
+}
+
+static void
+gimp_offset_tool_edge_behavior_toggled (GtkToggleButton *toggle,
+                                        GimpOffsetTool  *offset_tool)
+{
+  if (gtk_toggle_button_get_active (toggle))
+    {
+      GimpOffsetType type;
+
+      type = GPOINTER_TO_INT (g_object_get_data (G_OBJECT (toggle),
+                                                 "gimp-item-data"));
+
+      g_object_set (GIMP_FILTER_TOOL (offset_tool)->config,
+                    "type", type,
+                    NULL);
+    }
+}
+
+static void
+gimp_offset_tool_background_changed (GimpContext    *context,
+                                     const GimpRGB  *color,
+                                     GimpOffsetTool *offset_tool)
+{
+  GimpFilterTool *filter_tool = GIMP_FILTER_TOOL (offset_tool);
+  GimpOffsetType  type;
+
+  g_object_get (filter_tool->config,
+                "type", &type,
+                NULL);
+
+  if (type == GIMP_OFFSET_BACKGROUND)
+    {
+      gegl_node_set (filter_tool->operation,
+                     "context", context,
+                     NULL);
+
+      gimp_drawable_filter_apply (filter_tool->filter, NULL);
+    }
+}
+
+static gint
+gimp_offset_tool_get_width (GimpOffsetTool *offset_tool)
+{
+  GeglRectangle drawable_area;
+  gint          drawable_offset_x;
+  gint          drawable_offset_y;
+
+  if (gimp_filter_tool_get_drawable_area (GIMP_FILTER_TOOL (offset_tool),
+                                          &drawable_offset_x,
+                                          &drawable_offset_y,
+                                          &drawable_area) &&
+      ! gegl_rectangle_is_empty (&drawable_area))
+    {
+      return drawable_area.width;
+    }
+
+  return 0;
+}
+
+static gint
+gimp_offset_tool_get_height (GimpOffsetTool *offset_tool)
+{
+  GeglRectangle drawable_area;
+  gint          drawable_offset_x;
+  gint          drawable_offset_y;
+
+  if (gimp_filter_tool_get_drawable_area (GIMP_FILTER_TOOL (offset_tool),
+                                          &drawable_offset_x,
+                                          &drawable_offset_y,
+                                          &drawable_area) &&
+      ! gegl_rectangle_is_empty (&drawable_area))
+    {
+      return drawable_area.height;
+    }
+
+  return 0;
+}
+
+static void
+gimp_offset_tool_update (GimpOffsetTool *offset_tool)
+{
+  GimpTool       *tool        = GIMP_TOOL (offset_tool);
+  GimpFilterTool *filter_tool = GIMP_FILTER_TOOL (offset_tool);
+  GimpOffsetType  orig_type;
+  gint            orig_x;
+  gint            orig_y;
+  GimpOffsetType  type;
+  gint            x;
+  gint            y;
+  gint            width;
+  gint            height;
+
+  g_object_get (filter_tool->config,
+                "type", &orig_type,
+                "x",    &orig_x,
+                "y",    &orig_y,
+                NULL);
+
+  width  = gimp_offset_tool_get_width  (offset_tool);
+  height = gimp_offset_tool_get_height (offset_tool);
+
+  x = CLAMP (orig_x, -width,  +width);
+  y = CLAMP (orig_y, -height, +height);
+
+  type = orig_type;
+
+  if (tool->drawable                             &&
+      ! gimp_drawable_has_alpha (tool->drawable) &&
+      type == GIMP_OFFSET_TRANSPARENT)
+    {
+      type = GIMP_OFFSET_BACKGROUND;
+    }
+
+  if (x    != orig_x ||
+      y    != orig_y ||
+      type != orig_type)
+    {
+      g_object_set (filter_tool->config,
+                    "type", type,
+                    "x",    x,
+                    "y",    y,
+                    NULL);
+    }
+
+  if (offset_tool->offset_se)
+    {
+      gint width  = gimp_offset_tool_get_width  (offset_tool);
+      gint height = gimp_offset_tool_get_height (offset_tool);
+
+      g_signal_handlers_block_by_func (offset_tool->offset_se,
+                                       gimp_offset_tool_offset_changed,
+                                       offset_tool);
+
+      gimp_size_entry_set_refval_boundaries (
+        GIMP_SIZE_ENTRY (offset_tool->offset_se), 0,
+        -width, +width);
+      gimp_size_entry_set_refval_boundaries (
+        GIMP_SIZE_ENTRY (offset_tool->offset_se), 1,
+        -height, +height);
+
+      gimp_size_entry_set_size (
+        GIMP_SIZE_ENTRY (offset_tool->offset_se), 0,
+        0, width);
+      gimp_size_entry_set_size (
+        GIMP_SIZE_ENTRY (offset_tool->offset_se), 1,
+        0, height);
+
+      gimp_size_entry_set_refval (GIMP_SIZE_ENTRY (offset_tool->offset_se), 0,
+                                  x);
+      gimp_size_entry_set_refval (GIMP_SIZE_ENTRY (offset_tool->offset_se), 1,
+                                  y);
+
+      g_signal_handlers_unblock_by_func (offset_tool->offset_se,
+                                         gimp_offset_tool_offset_changed,
+                                         offset_tool);
+    }
+
+  if (offset_tool->transparent_radio)
+    {
+      gimp_int_radio_group_set_active (
+        GTK_RADIO_BUTTON (offset_tool->transparent_radio),
+        type);
+    }
+}
+
+static void
+gimp_offset_tool_halt (GimpOffsetTool *offset_tool)
+{
+  GimpContext *context = GIMP_CONTEXT (GIMP_TOOL_GET_OPTIONS (offset_tool));
+
+  offset_tool->offset_se         = NULL;
+  offset_tool->transparent_radio = NULL;
+
+  g_signal_handlers_disconnect_by_func (
+    context,
+    gimp_offset_tool_background_changed,
+    offset_tool);
+}