Adding upstream version 2.10.34.upstream/2.10.34upstream

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

1 files changed, 723 insertions, 0 deletions

diff --git a/app/tools/gimpcroptool.c b/app/tools/gimpcroptool.c
new file mode 100644
index 0000000..1803d00
--- /dev/null
+++ b/app/tools/gimpcroptool.c
@@ -0,0 +1,723 @@
+/* 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 <gegl.h>
+#include <gtk/gtk.h>
+
+#include "libgimpwidgets/gimpwidgets.h"
+
+#include "tools-types.h"
+
+#include "core/gimp.h"
+#include "core/gimpimage.h"
+#include "core/gimpimage-crop.h"
+#include "core/gimpitem.h"
+#include "core/gimptoolinfo.h"
+
+#include "widgets/gimphelp-ids.h"
+
+#include "display/gimpdisplay.h"
+#include "display/gimpdisplayshell.h"
+#include "display/gimptoolrectangle.h"
+
+#include "gimpcropoptions.h"
+#include "gimpcroptool.h"
+#include "gimprectangleoptions.h"
+#include "gimptoolcontrol.h"
+#include "gimptools-utils.h"
+
+#include "gimp-intl.h"
+
+
+static void      gimp_crop_tool_constructed                (GObject              *object);
+static void      gimp_crop_tool_dispose                    (GObject              *object);
+
+static void      gimp_crop_tool_control                    (GimpTool             *tool,
+                                                            GimpToolAction        action,
+                                                            GimpDisplay          *display);
+static void      gimp_crop_tool_button_press               (GimpTool             *tool,
+                                                            const GimpCoords     *coords,
+                                                            guint32               time,
+                                                            GdkModifierType       state,
+                                                            GimpButtonPressType   press_type,
+                                                            GimpDisplay          *display);
+static void      gimp_crop_tool_button_release             (GimpTool             *tool,
+                                                            const GimpCoords     *coords,
+                                                            guint32               time,
+                                                            GdkModifierType       state,
+                                                            GimpButtonReleaseType release_type,
+                                                            GimpDisplay          *display);
+static void     gimp_crop_tool_motion                      (GimpTool             *tool,
+                                                            const GimpCoords     *coords,
+                                                            guint32               time,
+                                                            GdkModifierType       state,
+                                                            GimpDisplay          *display);
+static void      gimp_crop_tool_options_notify             (GimpTool             *tool,
+                                                            GimpToolOptions      *options,
+                                                            const GParamSpec     *pspec);
+
+static void      gimp_crop_tool_rectangle_changed          (GimpToolWidget       *rectangle,
+                                                            GimpCropTool         *crop_tool);
+static void      gimp_crop_tool_rectangle_response         (GimpToolWidget       *rectangle,
+                                                            gint                  response_id,
+                                                            GimpCropTool         *crop_tool);
+static void      gimp_crop_tool_rectangle_change_complete  (GimpToolRectangle    *rectangle,
+                                                            GimpCropTool         *crop_tool);
+
+static void      gimp_crop_tool_start                      (GimpCropTool         *crop_tool,
+                                                            GimpDisplay          *display);
+static void      gimp_crop_tool_commit                     (GimpCropTool         *crop_tool);
+static void      gimp_crop_tool_halt                       (GimpCropTool         *crop_tool);
+
+static void      gimp_crop_tool_update_option_defaults     (GimpCropTool         *crop_tool,
+                                                            gboolean              ignore_pending);
+static GimpRectangleConstraint
+                 gimp_crop_tool_get_constraint             (GimpCropTool         *crop_tool);
+
+static void      gimp_crop_tool_image_changed              (GimpCropTool         *crop_tool,
+                                                            GimpImage            *image,
+                                                            GimpContext          *context);
+static void      gimp_crop_tool_image_size_changed         (GimpCropTool         *crop_tool);
+static void      gimp_crop_tool_image_active_layer_changed (GimpCropTool         *crop_tool);
+static void      gimp_crop_tool_layer_size_changed         (GimpCropTool         *crop_tool);
+
+static void      gimp_crop_tool_auto_shrink                (GimpCropTool         *crop_tool);
+
+
+G_DEFINE_TYPE (GimpCropTool, gimp_crop_tool, GIMP_TYPE_DRAW_TOOL)
+
+#define parent_class gimp_crop_tool_parent_class
+
+
+/*  public functions  */
+
+void
+gimp_crop_tool_register (GimpToolRegisterCallback  callback,
+                         gpointer                  data)
+{
+  (* callback) (GIMP_TYPE_CROP_TOOL,
+                GIMP_TYPE_CROP_OPTIONS,
+                gimp_crop_options_gui,
+                GIMP_CONTEXT_PROP_MASK_FOREGROUND |
+                GIMP_CONTEXT_PROP_MASK_BACKGROUND |
+                GIMP_CONTEXT_PROP_MASK_PATTERN,
+                "gimp-crop-tool",
+                _("Crop"),
+                _("Crop Tool: Remove edge areas from image or layer"),
+                N_("_Crop"), "<shift>C",
+                NULL, GIMP_HELP_TOOL_CROP,
+                GIMP_ICON_TOOL_CROP,
+                data);
+}
+
+static void
+gimp_crop_tool_class_init (GimpCropToolClass *klass)
+{
+  GObjectClass  *object_class = G_OBJECT_CLASS (klass);
+  GimpToolClass *tool_class   = GIMP_TOOL_CLASS (klass);
+
+  object_class->constructed  = gimp_crop_tool_constructed;
+  object_class->dispose      = gimp_crop_tool_dispose;
+
+  tool_class->control        = gimp_crop_tool_control;
+  tool_class->button_press   = gimp_crop_tool_button_press;
+  tool_class->button_release = gimp_crop_tool_button_release;
+  tool_class->motion         = gimp_crop_tool_motion;
+  tool_class->options_notify = gimp_crop_tool_options_notify;
+}
+
+static void
+gimp_crop_tool_init (GimpCropTool *crop_tool)
+{
+  GimpTool *tool = GIMP_TOOL (crop_tool);
+
+  gimp_tool_control_set_wants_click      (tool->control, TRUE);
+  gimp_tool_control_set_active_modifiers (tool->control,
+                                          GIMP_TOOL_ACTIVE_MODIFIERS_SEPARATE);
+  gimp_tool_control_set_precision        (tool->control,
+                                          GIMP_CURSOR_PRECISION_PIXEL_BORDER);
+  gimp_tool_control_set_cursor           (tool->control,
+                                          GIMP_CURSOR_CROSSHAIR_SMALL);
+  gimp_tool_control_set_tool_cursor      (tool->control,
+                                          GIMP_TOOL_CURSOR_CROP);
+
+  gimp_draw_tool_set_default_status (GIMP_DRAW_TOOL (tool),
+                                     _("Click-Drag to draw a crop rectangle"));
+}
+
+static void
+gimp_crop_tool_constructed (GObject *object)
+{
+  GimpCropTool    *crop_tool = GIMP_CROP_TOOL (object);
+  GimpContext     *context;
+  GimpToolInfo    *tool_info;
+
+  G_OBJECT_CLASS (parent_class)->constructed (object);
+
+  tool_info = GIMP_TOOL (crop_tool)->tool_info;
+
+  context = gimp_get_user_context (tool_info->gimp);
+
+  g_signal_connect_object (context, "image-changed",
+                           G_CALLBACK (gimp_crop_tool_image_changed),
+                           crop_tool,
+                           G_CONNECT_SWAPPED);
+
+  /* Make sure we are connected to "size-changed" for the initial
+   * image.
+   */
+  gimp_crop_tool_image_changed (crop_tool,
+                                gimp_context_get_image (context),
+                                context);
+}
+
+static void
+gimp_crop_tool_dispose (GObject *object)
+{
+  GimpCropTool *crop_tool = GIMP_CROP_TOOL (object);
+
+  /* Clean up current_image and current_layer. */
+  gimp_crop_tool_image_changed (crop_tool, NULL, NULL);
+
+  G_OBJECT_CLASS (parent_class)->dispose (object);
+}
+
+static void
+gimp_crop_tool_control (GimpTool       *tool,
+                        GimpToolAction  action,
+                        GimpDisplay    *display)
+{
+  GimpCropTool *crop_tool = GIMP_CROP_TOOL (tool);
+
+  switch (action)
+    {
+    case GIMP_TOOL_ACTION_PAUSE:
+    case GIMP_TOOL_ACTION_RESUME:
+      break;
+
+    case GIMP_TOOL_ACTION_HALT:
+      gimp_crop_tool_halt (crop_tool);
+      break;
+
+    case GIMP_TOOL_ACTION_COMMIT:
+      gimp_crop_tool_commit (crop_tool);
+      break;
+    }
+
+  GIMP_TOOL_CLASS (parent_class)->control (tool, action, display);
+}
+
+static void
+gimp_crop_tool_button_press (GimpTool            *tool,
+                             const GimpCoords    *coords,
+                             guint32              time,
+                             GdkModifierType      state,
+                             GimpButtonPressType  press_type,
+                             GimpDisplay         *display)
+{
+  GimpCropTool *crop_tool = GIMP_CROP_TOOL (tool);
+
+  if (tool->display && display != tool->display)
+    gimp_tool_control (tool, GIMP_TOOL_ACTION_HALT, tool->display);
+
+  if (! tool->display)
+    {
+      gimp_crop_tool_start (crop_tool, display);
+
+      gimp_tool_widget_hover (crop_tool->widget, coords, state, TRUE);
+
+      /* HACK: force CREATING on a newly created rectangle; otherwise,
+       * property bindings would cause the rectangle to start with the
+       * size from tool options.
+       */
+      gimp_tool_rectangle_set_function (GIMP_TOOL_RECTANGLE (crop_tool->widget),
+                                        GIMP_TOOL_RECTANGLE_CREATING);
+    }
+
+  if (gimp_tool_widget_button_press (crop_tool->widget, coords, time, state,
+                                     press_type))
+    {
+      crop_tool->grab_widget = crop_tool->widget;
+    }
+
+  gimp_tool_control_activate (tool->control);
+}
+
+static void
+gimp_crop_tool_button_release (GimpTool              *tool,
+                               const GimpCoords      *coords,
+                               guint32                time,
+                               GdkModifierType        state,
+                               GimpButtonReleaseType  release_type,
+                               GimpDisplay           *display)
+{
+  GimpCropTool *crop_tool = GIMP_CROP_TOOL (tool);
+
+  gimp_tool_control_halt (tool->control);
+
+  if (crop_tool->grab_widget)
+    {
+      gimp_tool_widget_button_release (crop_tool->grab_widget,
+                                       coords, time, state, release_type);
+      crop_tool->grab_widget = NULL;
+    }
+
+  gimp_tool_push_status (tool, display, _("Click or press Enter to crop"));
+}
+
+static void
+gimp_crop_tool_motion (GimpTool         *tool,
+                       const GimpCoords *coords,
+                       guint32           time,
+                       GdkModifierType   state,
+                       GimpDisplay      *display)
+{
+  GimpCropTool *crop_tool = GIMP_CROP_TOOL (tool);
+
+  if (crop_tool->grab_widget)
+    {
+      gimp_tool_widget_motion (crop_tool->grab_widget, coords, time, state);
+    }
+}
+
+static void
+gimp_crop_tool_options_notify (GimpTool         *tool,
+                               GimpToolOptions  *options,
+                               const GParamSpec *pspec)
+{
+  GimpCropTool *crop_tool = GIMP_CROP_TOOL (tool);
+
+  if (! strcmp (pspec->name, "layer-only") ||
+      ! strcmp (pspec->name, "allow-growing"))
+    {
+      if (crop_tool->widget)
+        {
+          gimp_tool_rectangle_set_constraint (GIMP_TOOL_RECTANGLE (crop_tool->widget),
+                                              gimp_crop_tool_get_constraint (crop_tool));
+        }
+      else
+        {
+          gimp_crop_tool_update_option_defaults (crop_tool, FALSE);
+        }
+    }
+}
+
+static void
+gimp_crop_tool_rectangle_changed (GimpToolWidget *rectangle,
+                                  GimpCropTool   *crop_tool)
+{
+}
+
+static void
+gimp_crop_tool_rectangle_response (GimpToolWidget *rectangle,
+                                   gint            response_id,
+                                   GimpCropTool   *crop_tool)
+{
+  GimpTool *tool = GIMP_TOOL (crop_tool);
+
+  switch (response_id)
+    {
+    case GIMP_TOOL_WIDGET_RESPONSE_CONFIRM:
+      gimp_tool_control (tool, GIMP_TOOL_ACTION_COMMIT, tool->display);
+      break;
+
+    case GIMP_TOOL_WIDGET_RESPONSE_CANCEL:
+      gimp_tool_control (tool, GIMP_TOOL_ACTION_HALT, tool->display);
+      break;
+    }
+}
+
+static void
+gimp_crop_tool_rectangle_change_complete (GimpToolRectangle *rectangle,
+                                          GimpCropTool      *crop_tool)
+{
+  gimp_crop_tool_update_option_defaults (crop_tool, FALSE);
+}
+
+static void
+gimp_crop_tool_start (GimpCropTool *crop_tool,
+                      GimpDisplay  *display)
+{
+  static const gchar *properties[] =
+  {
+    "highlight",
+    "highlight-opacity",
+    "guide",
+    "x",
+    "y",
+    "width",
+    "height",
+    "fixed-rule-active",
+    "fixed-rule",
+    "desired-fixed-width",
+    "desired-fixed-height",
+    "desired-fixed-size-width",
+    "desired-fixed-size-height",
+    "aspect-numerator",
+    "aspect-denominator",
+    "fixed-center"
+  };
+
+  GimpTool         *tool    = GIMP_TOOL (crop_tool);
+  GimpDisplayShell *shell   = gimp_display_get_shell (display);
+  GimpCropOptions  *options = GIMP_CROP_TOOL_GET_OPTIONS (crop_tool);
+  GimpToolWidget   *widget;
+  gint              i;
+
+  tool->display = display;
+
+  crop_tool->widget = widget = gimp_tool_rectangle_new (shell);
+
+  g_object_set (widget,
+                "status-title", _("Crop to: "),
+                NULL);
+
+  gimp_draw_tool_set_widget (GIMP_DRAW_TOOL (tool), widget);
+
+  for (i = 0; i < G_N_ELEMENTS (properties); i++)
+    {
+      GBinding *binding =
+        g_object_bind_property (G_OBJECT (options), properties[i],
+                                G_OBJECT (widget),  properties[i],
+                                G_BINDING_SYNC_CREATE |
+                                G_BINDING_BIDIRECTIONAL);
+
+      crop_tool->bindings = g_list_prepend (crop_tool->bindings, binding);
+    }
+
+  gimp_rectangle_options_connect (GIMP_RECTANGLE_OPTIONS (options),
+                                  gimp_display_get_image (shell->display),
+                                  G_CALLBACK (gimp_crop_tool_auto_shrink),
+                                  crop_tool);
+
+  gimp_tool_rectangle_set_constraint (GIMP_TOOL_RECTANGLE (widget),
+                                      gimp_crop_tool_get_constraint (crop_tool));
+
+  g_signal_connect (widget, "changed",
+                    G_CALLBACK (gimp_crop_tool_rectangle_changed),
+                    crop_tool);
+  g_signal_connect (widget, "response",
+                    G_CALLBACK (gimp_crop_tool_rectangle_response),
+                    crop_tool);
+  g_signal_connect (widget, "change-complete",
+                    G_CALLBACK (gimp_crop_tool_rectangle_change_complete),
+                    crop_tool);
+
+  gimp_draw_tool_start (GIMP_DRAW_TOOL (tool), display);
+}
+
+static void
+gimp_crop_tool_commit (GimpCropTool *crop_tool)
+{
+  GimpTool *tool = GIMP_TOOL (crop_tool);
+
+  if (tool->display)
+    {
+      GimpCropOptions *options = GIMP_CROP_TOOL_GET_OPTIONS (tool);
+      GimpImage       *image   = gimp_display_get_image (tool->display);
+      gdouble          x, y;
+      gdouble          x2, y2;
+      gint             w, h;
+
+      gimp_tool_rectangle_get_public_rect (GIMP_TOOL_RECTANGLE (crop_tool->widget),
+                                           &x, &y, &x2, &y2);
+      w = x2 - x;
+      h = y2 - y;
+
+      gimp_tool_pop_status (tool, tool->display);
+
+      /* if rectangle exists, crop it */
+      if (w > 0 && h > 0)
+        {
+          if (options->layer_only)
+            {
+              GimpLayer *layer = gimp_image_get_active_layer (image);
+              gint       off_x, off_y;
+
+              if (! layer)
+                {
+                  gimp_tool_message_literal (tool, tool->display,
+                                             _("There is no active layer to crop."));
+                  return;
+                }
+
+              if (gimp_item_is_content_locked (GIMP_ITEM (layer)))
+                {
+                  gimp_tool_message_literal (tool, tool->display,
+                                             _("The active layer's pixels are locked."));
+                  gimp_tools_blink_lock_box (tool->display->gimp,
+                                             GIMP_ITEM (layer));
+                  return;
+                }
+
+              gimp_item_get_offset (GIMP_ITEM (layer), &off_x, &off_y);
+
+              off_x -= x;
+              off_y -= y;
+
+              gimp_item_resize (GIMP_ITEM (layer),
+                                GIMP_CONTEXT (options), options->fill_type,
+                                w, h, off_x, off_y);
+            }
+          else
+            {
+              gimp_image_crop (image,
+                               GIMP_CONTEXT (options), GIMP_FILL_TRANSPARENT,
+                               x, y, w, h, options->delete_pixels);
+            }
+
+          gimp_image_flush (image);
+        }
+    }
+}
+
+static void
+gimp_crop_tool_halt (GimpCropTool *crop_tool)
+{
+  GimpTool         *tool    = GIMP_TOOL (crop_tool);
+  GimpCropOptions  *options = GIMP_CROP_TOOL_GET_OPTIONS (crop_tool);
+
+  if (tool->display)
+    {
+      GimpDisplayShell *shell = gimp_display_get_shell (tool->display);
+
+      gimp_display_shell_set_highlight (shell, NULL, 0.0);
+
+      gimp_rectangle_options_disconnect (GIMP_RECTANGLE_OPTIONS (options),
+                                         G_CALLBACK (gimp_crop_tool_auto_shrink),
+                                         crop_tool);
+    }
+
+  if (gimp_draw_tool_is_active (GIMP_DRAW_TOOL (tool)))
+    gimp_draw_tool_stop (GIMP_DRAW_TOOL (tool));
+
+  /*  disconnect bindings manually so they are really gone *now*, we
+   *  might be in the middle of a signal emission that keeps the
+   *  widget and its bindings alive.
+   */
+  g_list_free_full (crop_tool->bindings, (GDestroyNotify) g_object_unref);
+  crop_tool->bindings = NULL;
+
+  gimp_draw_tool_set_widget (GIMP_DRAW_TOOL (tool), NULL);
+  g_clear_object (&crop_tool->widget);
+
+  tool->display  = NULL;
+  tool->drawable = NULL;
+
+  gimp_crop_tool_update_option_defaults (crop_tool, TRUE);
+}
+
+/**
+ * gimp_crop_tool_update_option_defaults:
+ * @crop_tool:
+ * @ignore_pending: %TRUE to ignore any pending crop rectangle.
+ *
+ * Sets the default Fixed: Aspect ratio and Fixed: Size option
+ * properties.
+ */
+static void
+gimp_crop_tool_update_option_defaults (GimpCropTool *crop_tool,
+                                       gboolean      ignore_pending)
+{
+  GimpTool             *tool      = GIMP_TOOL (crop_tool);
+  GimpToolRectangle    *rectangle = GIMP_TOOL_RECTANGLE (crop_tool->widget);
+  GimpRectangleOptions *options;
+
+  options = GIMP_RECTANGLE_OPTIONS (GIMP_TOOL_GET_OPTIONS (tool));
+
+  if (rectangle && ! ignore_pending)
+    {
+      /* There is a pending rectangle and we should not ignore it, so
+       * set default Fixed: Aspect ratio to the same as the current
+       * pending rectangle width/height.
+       */
+
+      gimp_tool_rectangle_pending_size_set (rectangle,
+                                            G_OBJECT (options),
+                                            "default-aspect-numerator",
+                                            "default-aspect-denominator");
+
+      g_object_set (G_OBJECT (options),
+                    "use-string-current", TRUE,
+                    NULL);
+    }
+  else
+    {
+      /* There is no pending rectangle, set default Fixed: Aspect
+       * ratio to that of the current image/layer.
+       */
+
+      if (! rectangle)
+        {
+          /* ugly hack: if we don't have a widget, construct a temporary one
+           * so that we can use it to call
+           * gimp_tool_rectangle_constraint_size_set().
+           */
+
+          GimpContext *context = gimp_get_user_context (tool->tool_info->gimp);
+          GimpDisplay *display = gimp_context_get_display (context);
+
+          if (display)
+            {
+              GimpDisplayShell *shell = gimp_display_get_shell (display);
+
+              rectangle = GIMP_TOOL_RECTANGLE (gimp_tool_rectangle_new (shell));
+
+              gimp_tool_rectangle_set_constraint (
+                rectangle, gimp_crop_tool_get_constraint (crop_tool));
+            }
+        }
+
+      if (rectangle)
+        {
+          gimp_tool_rectangle_constraint_size_set (rectangle,
+                                                   G_OBJECT (options),
+                                                   "default-aspect-numerator",
+                                                   "default-aspect-denominator");
+
+          if (! crop_tool->widget)
+            g_object_unref (rectangle);
+        }
+
+      g_object_set (G_OBJECT (options),
+                    "use-string-current", FALSE,
+                    NULL);
+    }
+}
+
+static GimpRectangleConstraint
+gimp_crop_tool_get_constraint (GimpCropTool *crop_tool)
+{
+  GimpCropOptions *crop_options = GIMP_CROP_TOOL_GET_OPTIONS (crop_tool);
+
+  if (crop_options->allow_growing)
+    {
+      return GIMP_RECTANGLE_CONSTRAIN_NONE;
+    }
+  else
+    {
+      return crop_options->layer_only ? GIMP_RECTANGLE_CONSTRAIN_DRAWABLE :
+                                        GIMP_RECTANGLE_CONSTRAIN_IMAGE;
+    }
+}
+
+static void
+gimp_crop_tool_image_changed (GimpCropTool *crop_tool,
+                              GimpImage    *image,
+                              GimpContext  *context)
+{
+  if (crop_tool->current_image)
+    {
+      g_signal_handlers_disconnect_by_func (crop_tool->current_image,
+                                            gimp_crop_tool_image_size_changed,
+                                            NULL);
+      g_signal_handlers_disconnect_by_func (crop_tool->current_image,
+                                            gimp_crop_tool_image_active_layer_changed,
+                                            NULL);
+
+      g_object_remove_weak_pointer (G_OBJECT (crop_tool->current_image),
+                                    (gpointer) &crop_tool->current_image);
+    }
+
+  crop_tool->current_image = image;
+
+  if (crop_tool->current_image)
+    {
+      g_object_add_weak_pointer (G_OBJECT (crop_tool->current_image),
+                                 (gpointer) &crop_tool->current_image);
+
+      g_signal_connect_object (crop_tool->current_image, "size-changed",
+                               G_CALLBACK (gimp_crop_tool_image_size_changed),
+                               crop_tool,
+                               G_CONNECT_SWAPPED);
+      g_signal_connect_object (crop_tool->current_image, "active-layer-changed",
+                               G_CALLBACK (gimp_crop_tool_image_active_layer_changed),
+                               crop_tool,
+                               G_CONNECT_SWAPPED);
+    }
+
+  /* Make sure we are connected to "size-changed" for the initial
+   * layer.
+   */
+  gimp_crop_tool_image_active_layer_changed (crop_tool);
+
+  gimp_crop_tool_update_option_defaults (GIMP_CROP_TOOL (crop_tool), FALSE);
+}
+
+static void
+gimp_crop_tool_image_size_changed (GimpCropTool *crop_tool)
+{
+  gimp_crop_tool_update_option_defaults (crop_tool, FALSE);
+}
+
+static void
+gimp_crop_tool_image_active_layer_changed (GimpCropTool *crop_tool)
+{
+  if (crop_tool->current_layer)
+    {
+      g_signal_handlers_disconnect_by_func (crop_tool->current_layer,
+                                            gimp_crop_tool_layer_size_changed,
+                                            NULL);
+
+      g_object_remove_weak_pointer (G_OBJECT (crop_tool->current_layer),
+                                    (gpointer) &crop_tool->current_layer);
+    }
+
+  if (crop_tool->current_image)
+    {
+      crop_tool->current_layer =
+        gimp_image_get_active_layer (crop_tool->current_image);
+    }
+  else
+    {
+      crop_tool->current_layer = NULL;
+    }
+
+  if (crop_tool->current_layer)
+    {
+      g_object_add_weak_pointer (G_OBJECT (crop_tool->current_layer),
+                                 (gpointer) &crop_tool->current_layer);
+
+      g_signal_connect_object (crop_tool->current_layer, "size-changed",
+                               G_CALLBACK (gimp_crop_tool_layer_size_changed),
+                               crop_tool,
+                               G_CONNECT_SWAPPED);
+    }
+
+  gimp_crop_tool_update_option_defaults (crop_tool, FALSE);
+}
+
+static void
+gimp_crop_tool_layer_size_changed (GimpCropTool *crop_tool)
+{
+  gimp_crop_tool_update_option_defaults (crop_tool, FALSE);
+}
+
+static void
+gimp_crop_tool_auto_shrink (GimpCropTool *crop_tool)
+{
+  gboolean shrink_merged ;
+
+  g_object_get (gimp_tool_get_options (GIMP_TOOL (crop_tool)),
+                "shrink-merged", &shrink_merged,
+                NULL);
+
+  gimp_tool_rectangle_auto_shrink (GIMP_TOOL_RECTANGLE (crop_tool->widget),
+                                   shrink_merged);
+}