Adding upstream version 2.10.34.upstream/2.10.34upstream

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

1 files changed, 738 insertions, 0 deletions

diff --git a/app/core/gimpsymmetry-mirror.c b/app/core/gimpsymmetry-mirror.c
new file mode 100644
index 0000000..66a0eaa
--- /dev/null
+++ b/app/core/gimpsymmetry-mirror.c
@@ -0,0 +1,738 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpsymmetry-mirror.c
+ * Copyright (C) 2015 Jehan <jehan@gimp.org>
+ *
+ * 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 <cairo.h>
+#include <gegl.h>
+#include <gdk-pixbuf/gdk-pixbuf.h>
+
+#include "libgimpconfig/gimpconfig.h"
+
+#include "core-types.h"
+
+#include "gimp.h"
+#include "gimp-cairo.h"
+#include "gimpbrush.h"
+#include "gimpguide.h"
+#include "gimpimage.h"
+#include "gimpimage-guides.h"
+#include "gimpimage-symmetry.h"
+#include "gimpitem.h"
+#include "gimpsymmetry-mirror.h"
+
+#include "gimp-intl.h"
+
+
+enum
+{
+  PROP_0,
+  PROP_HORIZONTAL_SYMMETRY,
+  PROP_VERTICAL_SYMMETRY,
+  PROP_POINT_SYMMETRY,
+  PROP_DISABLE_TRANSFORMATION,
+  PROP_MIRROR_POSITION_X,
+  PROP_MIRROR_POSITION_Y
+};
+
+
+/* Local function prototypes */
+
+static void       gimp_mirror_constructed             (GObject             *object);
+static void       gimp_mirror_finalize                (GObject             *object);
+static void       gimp_mirror_set_property            (GObject             *object,
+                                                       guint                property_id,
+                                                       const GValue        *value,
+                                                       GParamSpec          *pspec);
+static void       gimp_mirror_get_property            (GObject             *object,
+                                                       guint                property_id,
+                                                       GValue              *value,
+                                                       GParamSpec          *pspec);
+
+static void       gimp_mirror_update_strokes          (GimpSymmetry        *mirror,
+                                                       GimpDrawable        *drawable,
+                                                       GimpCoords          *origin);
+static void       gimp_mirror_get_transform           (GimpSymmetry        *mirror,
+                                                       gint                 stroke,
+                                                       gdouble             *angle,
+                                                       gboolean            *reflect);
+static void       gimp_mirror_reset                   (GimpMirror          *mirror);
+static void       gimp_mirror_add_guide               (GimpMirror          *mirror,
+                                                       GimpOrientationType  orientation);
+static void       gimp_mirror_remove_guide            (GimpMirror          *mirror,
+                                                       GimpOrientationType  orientation);
+static void       gimp_mirror_guide_removed_cb        (GObject             *object,
+                                                       GimpMirror          *mirror);
+static void       gimp_mirror_guide_position_cb       (GObject             *object,
+                                                       GParamSpec          *pspec,
+                                                       GimpMirror          *mirror);
+static void       gimp_mirror_active_changed          (GimpSymmetry        *sym);
+static void       gimp_mirror_set_horizontal_symmetry (GimpMirror          *mirror,
+                                                       gboolean             active);
+static void       gimp_mirror_set_vertical_symmetry   (GimpMirror          *mirror,
+                                                       gboolean             active);
+static void       gimp_mirror_set_point_symmetry      (GimpMirror          *mirror,
+                                                       gboolean             active);
+
+static void       gimp_mirror_image_size_changed_cb   (GimpImage           *image,
+                                                       gint                 previous_origin_x,
+                                                       gint                 previous_origin_y,
+                                                       gint                 previous_width,
+                                                       gint                 previous_height,
+                                                       GimpSymmetry        *sym);
+
+G_DEFINE_TYPE (GimpMirror, gimp_mirror, GIMP_TYPE_SYMMETRY)
+
+#define parent_class gimp_mirror_parent_class
+
+
+static void
+gimp_mirror_class_init (GimpMirrorClass *klass)
+{
+  GObjectClass      *object_class   = G_OBJECT_CLASS (klass);
+  GimpSymmetryClass *symmetry_class = GIMP_SYMMETRY_CLASS (klass);
+  GParamSpec        *pspec;
+
+  object_class->constructed         = gimp_mirror_constructed;
+  object_class->finalize            = gimp_mirror_finalize;
+  object_class->set_property        = gimp_mirror_set_property;
+  object_class->get_property        = gimp_mirror_get_property;
+
+  symmetry_class->label             = _("Mirror");
+  symmetry_class->update_strokes    = gimp_mirror_update_strokes;
+  symmetry_class->get_transform     = gimp_mirror_get_transform;
+  symmetry_class->active_changed    = gimp_mirror_active_changed;
+
+  GIMP_CONFIG_PROP_BOOLEAN (object_class, PROP_HORIZONTAL_SYMMETRY,
+                            "horizontal-symmetry",
+                            _("Horizontal Symmetry"),
+                            _("Reflect the initial stroke across a horizontal axis"),
+                            FALSE,
+                            GIMP_PARAM_STATIC_STRINGS |
+                            GIMP_SYMMETRY_PARAM_GUI);
+
+  GIMP_CONFIG_PROP_BOOLEAN (object_class, PROP_VERTICAL_SYMMETRY,
+                            "vertical-symmetry",
+                            _("Vertical Symmetry"),
+                            _("Reflect the initial stroke across a vertical axis"),
+                            FALSE,
+                            GIMP_PARAM_STATIC_STRINGS |
+                            GIMP_SYMMETRY_PARAM_GUI);
+
+  GIMP_CONFIG_PROP_BOOLEAN (object_class, PROP_POINT_SYMMETRY,
+                            "point-symmetry",
+                            _("Central Symmetry"),
+                            _("Invert the initial stroke through a point"),
+                            FALSE,
+                            GIMP_PARAM_STATIC_STRINGS |
+                            GIMP_SYMMETRY_PARAM_GUI);
+
+  GIMP_CONFIG_PROP_BOOLEAN (object_class, PROP_DISABLE_TRANSFORMATION,
+                            "disable-transformation",
+                            _("Disable brush transform"),
+                            _("Disable brush reflection"),
+                            FALSE,
+                            GIMP_PARAM_STATIC_STRINGS |
+                            GIMP_SYMMETRY_PARAM_GUI);
+
+  GIMP_CONFIG_PROP_DOUBLE (object_class, PROP_MIRROR_POSITION_X,
+                           "mirror-position-x",
+                           _("Vertical axis position"),
+                           NULL,
+                           0.0, G_MAXDOUBLE, 0.0,
+                           GIMP_PARAM_STATIC_STRINGS |
+                           GIMP_SYMMETRY_PARAM_GUI);
+
+  pspec = g_object_class_find_property (object_class, "mirror-position-x");
+  gegl_param_spec_set_property_key (pspec, "unit", "pixel-coordinate");
+  gegl_param_spec_set_property_key (pspec, "axis", "x");
+
+  GIMP_CONFIG_PROP_DOUBLE (object_class, PROP_MIRROR_POSITION_Y,
+                           "mirror-position-y",
+                           _("Horizontal axis position"),
+                           NULL,
+                           0.0, G_MAXDOUBLE, 0.0,
+                           GIMP_PARAM_STATIC_STRINGS |
+                           GIMP_SYMMETRY_PARAM_GUI);
+
+  pspec = g_object_class_find_property (object_class, "mirror-position-y");
+  gegl_param_spec_set_property_key (pspec, "unit", "pixel-coordinate");
+  gegl_param_spec_set_property_key (pspec, "axis", "y");
+}
+
+static void
+gimp_mirror_init (GimpMirror *mirror)
+{
+}
+
+static void
+gimp_mirror_constructed (GObject *object)
+{
+  GimpSymmetry *sym = GIMP_SYMMETRY (object);
+
+  g_signal_connect_object (sym->image, "size-changed-detailed",
+                           G_CALLBACK (gimp_mirror_image_size_changed_cb),
+                           sym, 0);
+}
+
+static void
+gimp_mirror_finalize (GObject *object)
+{
+  GimpMirror *mirror = GIMP_MIRROR (object);
+
+  g_clear_object (&mirror->horizontal_guide);
+  g_clear_object (&mirror->vertical_guide);
+
+  G_OBJECT_CLASS (parent_class)->finalize (object);
+}
+
+static void
+gimp_mirror_set_property (GObject      *object,
+                          guint         property_id,
+                          const GValue *value,
+                          GParamSpec   *pspec)
+{
+  GimpMirror *mirror = GIMP_MIRROR (object);
+  GimpImage  *image  = GIMP_SYMMETRY (mirror)->image;
+
+  switch (property_id)
+    {
+    case PROP_HORIZONTAL_SYMMETRY:
+      gimp_mirror_set_horizontal_symmetry (mirror,
+                                           g_value_get_boolean (value));
+      break;
+
+    case PROP_VERTICAL_SYMMETRY:
+      gimp_mirror_set_vertical_symmetry (mirror,
+                                         g_value_get_boolean (value));
+      break;
+
+    case PROP_POINT_SYMMETRY:
+      gimp_mirror_set_point_symmetry (mirror,
+                                      g_value_get_boolean (value));
+      break;
+
+    case PROP_DISABLE_TRANSFORMATION:
+      mirror->disable_transformation = g_value_get_boolean (value);
+      break;
+
+    case PROP_MIRROR_POSITION_X:
+      if (g_value_get_double (value) >= 0.0 &&
+          g_value_get_double (value) < (gdouble) gimp_image_get_width (image))
+        {
+          mirror->mirror_position_x = g_value_get_double (value);
+
+          if (mirror->vertical_guide)
+            {
+              g_signal_handlers_block_by_func (mirror->vertical_guide,
+                                               gimp_mirror_guide_position_cb,
+                                               mirror);
+              gimp_image_move_guide (image, mirror->vertical_guide,
+                                     mirror->mirror_position_x,
+                                     FALSE);
+              g_signal_handlers_unblock_by_func (mirror->vertical_guide,
+                                                 gimp_mirror_guide_position_cb,
+                                                 mirror);
+            }
+        }
+      break;
+
+    case PROP_MIRROR_POSITION_Y:
+      if (g_value_get_double (value) >= 0.0 &&
+          g_value_get_double (value) < (gdouble) gimp_image_get_height (image))
+        {
+          mirror->mirror_position_y = g_value_get_double (value);
+
+          if (mirror->horizontal_guide)
+            {
+              g_signal_handlers_block_by_func (mirror->horizontal_guide,
+                                               gimp_mirror_guide_position_cb,
+                                               mirror);
+              gimp_image_move_guide (image, mirror->horizontal_guide,
+                                     mirror->mirror_position_y,
+                                     FALSE);
+              g_signal_handlers_unblock_by_func (mirror->horizontal_guide,
+                                                 gimp_mirror_guide_position_cb,
+                                                 mirror);
+            }
+        }
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static void
+gimp_mirror_get_property (GObject    *object,
+                          guint       property_id,
+                          GValue     *value,
+                          GParamSpec *pspec)
+{
+  GimpMirror *mirror = GIMP_MIRROR (object);
+
+  switch (property_id)
+    {
+    case PROP_HORIZONTAL_SYMMETRY:
+      g_value_set_boolean (value, mirror->horizontal_mirror);
+      break;
+    case PROP_VERTICAL_SYMMETRY:
+      g_value_set_boolean (value, mirror->vertical_mirror);
+      break;
+    case PROP_POINT_SYMMETRY:
+      g_value_set_boolean (value, mirror->point_symmetry);
+      break;
+    case PROP_DISABLE_TRANSFORMATION:
+      g_value_set_boolean (value, mirror->disable_transformation);
+      break;
+    case PROP_MIRROR_POSITION_X:
+      g_value_set_double (value, mirror->mirror_position_x);
+      break;
+    case PROP_MIRROR_POSITION_Y:
+      g_value_set_double (value, mirror->mirror_position_y);
+      break;
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static void
+gimp_mirror_update_strokes (GimpSymmetry *sym,
+                            GimpDrawable *drawable,
+                            GimpCoords   *origin)
+{
+  GimpMirror *mirror  = GIMP_MIRROR (sym);
+  GList      *strokes = NULL;
+  GimpCoords *coords;
+  gdouble     mirror_position_x, mirror_position_y;
+  gint        offset_x,          offset_y;
+
+  gimp_item_get_offset (GIMP_ITEM (drawable), &offset_x, &offset_y);
+
+  mirror_position_x = mirror->mirror_position_x - offset_x;
+  mirror_position_y = mirror->mirror_position_y - offset_y;
+
+  g_list_free_full (sym->strokes, g_free);
+  strokes = g_list_prepend (strokes,
+                            g_memdup (origin, sizeof (GimpCoords)));
+
+  if (mirror->horizontal_mirror)
+    {
+      coords = g_memdup (origin, sizeof (GimpCoords));
+      coords->y = 2.0 * mirror_position_y - origin->y;
+      strokes = g_list_prepend (strokes, coords);
+    }
+
+  if (mirror->vertical_mirror)
+    {
+      coords = g_memdup (origin, sizeof (GimpCoords));
+      coords->x = 2.0 * mirror_position_x - origin->x;
+      strokes = g_list_prepend (strokes, coords);
+    }
+
+  if (mirror->point_symmetry)
+    {
+      coords = g_memdup (origin, sizeof (GimpCoords));
+      coords->x = 2.0 * mirror_position_x - origin->x;
+      coords->y = 2.0 * mirror_position_y - origin->y;
+      strokes = g_list_prepend (strokes, coords);
+    }
+
+  sym->strokes = g_list_reverse (strokes);
+
+  g_signal_emit_by_name (sym, "strokes-updated", sym->image);
+}
+
+static void
+gimp_mirror_get_transform (GimpSymmetry *sym,
+                           gint          stroke,
+                           gdouble      *angle,
+                           gboolean     *reflect)
+{
+  GimpMirror *mirror = GIMP_MIRROR (sym);
+
+  if (mirror->disable_transformation)
+    return;
+
+  if (! mirror->horizontal_mirror && stroke >= 1)
+    stroke++;
+
+  if (! mirror->vertical_mirror && stroke >= 2)
+    stroke++;
+
+  switch (stroke)
+    {
+    /* original */
+    case 0:
+      break;
+
+    /* horizontal */
+    case 1:
+      *angle   = 180.0;
+      *reflect = TRUE;
+      break;
+
+    /* vertical */
+    case 2:
+      *reflect = TRUE;
+      break;
+
+    /* central */
+    case 3:
+      *angle   = 180.0;
+      break;
+
+    default:
+      g_return_if_reached ();
+    }
+}
+
+static void
+gimp_mirror_reset (GimpMirror *mirror)
+{
+  GimpSymmetry *sym = GIMP_SYMMETRY (mirror);
+
+  if (sym->origin)
+    {
+      gimp_symmetry_set_origin (sym, sym->drawable,
+                                sym->origin);
+    }
+}
+
+static void
+gimp_mirror_add_guide (GimpMirror          *mirror,
+                       GimpOrientationType  orientation)
+{
+  GimpSymmetry *sym = GIMP_SYMMETRY (mirror);
+  GimpImage    *image;
+  Gimp         *gimp;
+  GimpGuide    *guide;
+  gdouble       position;
+
+  image = sym->image;
+  gimp  = image->gimp;
+
+  guide = gimp_guide_custom_new (orientation,
+                                 gimp->next_guide_ID++,
+                                 GIMP_GUIDE_STYLE_MIRROR);
+
+  if (orientation == GIMP_ORIENTATION_HORIZONTAL)
+    {
+      /* Mirror guide position at first activation is at canvas middle. */
+      if (mirror->mirror_position_y < 1.0)
+        position = gimp_image_get_height (image) / 2.0;
+      else
+        position = mirror->mirror_position_y;
+
+      g_object_set (mirror,
+                    "mirror-position-y", position,
+                    NULL);
+
+      mirror->horizontal_guide = guide;
+    }
+  else
+    {
+      /* Mirror guide position at first activation is at canvas middle. */
+      if (mirror->mirror_position_x < 1.0)
+        position = gimp_image_get_width (image) / 2.0;
+      else
+        position = mirror->mirror_position_x;
+
+      g_object_set (mirror,
+                    "mirror-position-x", position,
+                    NULL);
+
+      mirror->vertical_guide = guide;
+    }
+
+  g_signal_connect (guide, "removed",
+                    G_CALLBACK (gimp_mirror_guide_removed_cb),
+                    mirror);
+
+  gimp_image_add_guide (image, guide, (gint) position);
+
+  g_signal_connect (guide, "notify::position",
+                    G_CALLBACK (gimp_mirror_guide_position_cb),
+                    mirror);
+}
+
+static void
+gimp_mirror_remove_guide (GimpMirror          *mirror,
+                          GimpOrientationType  orientation)
+{
+  GimpSymmetry *sym = GIMP_SYMMETRY (mirror);
+  GimpImage    *image;
+  GimpGuide    *guide;
+
+  image = sym->image;
+  guide = (orientation == GIMP_ORIENTATION_HORIZONTAL) ?
+    mirror->horizontal_guide : mirror->vertical_guide;
+
+  /* The guide may have already been removed, for instance from GUI. */
+  if (guide)
+    {
+      g_signal_handlers_disconnect_by_func (G_OBJECT (guide),
+                                            gimp_mirror_guide_removed_cb,
+                                            mirror);
+      g_signal_handlers_disconnect_by_func (G_OBJECT (guide),
+                                            gimp_mirror_guide_position_cb,
+                                            mirror);
+
+      gimp_image_remove_guide (image, guide, FALSE);
+      g_object_unref (guide);
+
+      if (orientation == GIMP_ORIENTATION_HORIZONTAL)
+        mirror->horizontal_guide = NULL;
+      else
+        mirror->vertical_guide = NULL;
+    }
+}
+
+static void
+gimp_mirror_guide_removed_cb (GObject    *object,
+                              GimpMirror *mirror)
+{
+  GimpSymmetry *symmetry = GIMP_SYMMETRY (mirror);
+
+  g_signal_handlers_disconnect_by_func (object,
+                                        gimp_mirror_guide_removed_cb,
+                                        mirror);
+  g_signal_handlers_disconnect_by_func (object,
+                                        gimp_mirror_guide_position_cb,
+                                        mirror);
+
+  if (GIMP_GUIDE (object) == mirror->horizontal_guide)
+    {
+      g_object_unref (mirror->horizontal_guide);
+      mirror->horizontal_guide    = NULL;
+
+      g_object_set (mirror,
+                    "horizontal-symmetry", FALSE,
+                    NULL);
+      g_object_set (mirror,
+                    "point-symmetry", FALSE,
+                    NULL);
+      g_object_set (mirror,
+                    "mirror-position-y", 0.0,
+                    NULL);
+
+      if (mirror->vertical_guide &&
+          ! mirror->vertical_mirror)
+        {
+          g_signal_handlers_disconnect_by_func (G_OBJECT (mirror->vertical_guide),
+                                                gimp_mirror_guide_removed_cb,
+                                                mirror);
+          g_signal_handlers_disconnect_by_func (G_OBJECT (mirror->vertical_guide),
+                                                gimp_mirror_guide_position_cb,
+                                                mirror);
+
+          gimp_image_remove_guide (symmetry->image,
+                                   mirror->vertical_guide,
+                                   FALSE);
+          g_clear_object (&mirror->vertical_guide);
+        }
+    }
+  else if (GIMP_GUIDE (object) == mirror->vertical_guide)
+    {
+      g_object_unref (mirror->vertical_guide);
+      mirror->vertical_guide    = NULL;
+
+      g_object_set (mirror,
+                    "vertical-symmetry", FALSE,
+                    NULL);
+      g_object_set (mirror,
+                    "point-symmetry", FALSE,
+                    NULL);
+      g_object_set (mirror,
+                    "mirror-position-x", 0.0,
+                    NULL);
+
+      if (mirror->horizontal_guide &&
+          ! mirror->horizontal_mirror)
+        {
+          g_signal_handlers_disconnect_by_func (G_OBJECT (mirror->horizontal_guide),
+                                                gimp_mirror_guide_removed_cb,
+                                                mirror);
+          g_signal_handlers_disconnect_by_func (G_OBJECT (mirror->horizontal_guide),
+                                                gimp_mirror_guide_position_cb,
+                                                mirror);
+
+          gimp_image_remove_guide (symmetry->image,
+                                   mirror->horizontal_guide,
+                                   FALSE);
+          g_clear_object (&mirror->horizontal_guide);
+        }
+    }
+
+  if (mirror->horizontal_guide == NULL &&
+      mirror->vertical_guide   == NULL)
+    {
+      gimp_image_symmetry_remove (symmetry->image,
+                                  GIMP_SYMMETRY (mirror));
+    }
+  else
+    {
+      gimp_mirror_reset (mirror);
+      g_signal_emit_by_name (mirror, "gui-param-changed",
+                             GIMP_SYMMETRY (mirror)->image);
+    }
+}
+
+static void
+gimp_mirror_guide_position_cb (GObject    *object,
+                               GParamSpec *pspec,
+                               GimpMirror *mirror)
+{
+  GimpGuide *guide = GIMP_GUIDE (object);
+
+  if (guide == mirror->horizontal_guide)
+    {
+      g_object_set (mirror,
+                    "mirror-position-y", (gdouble) gimp_guide_get_position (guide),
+                    NULL);
+    }
+  else if (guide == mirror->vertical_guide)
+    {
+      g_object_set (mirror,
+                    "mirror-position-x", (gdouble) gimp_guide_get_position (guide),
+                    NULL);
+    }
+}
+
+static void
+gimp_mirror_active_changed (GimpSymmetry *sym)
+{
+  GimpMirror *mirror = GIMP_MIRROR (sym);
+
+  if (sym->active)
+    {
+      if ((mirror->horizontal_mirror || mirror->point_symmetry) &&
+          ! mirror->horizontal_guide)
+        gimp_mirror_add_guide (mirror, GIMP_ORIENTATION_HORIZONTAL);
+
+      if ((mirror->vertical_mirror || mirror->point_symmetry) &&
+          ! mirror->vertical_guide)
+        gimp_mirror_add_guide (mirror, GIMP_ORIENTATION_VERTICAL);
+    }
+  else
+    {
+      if (mirror->horizontal_guide)
+        gimp_mirror_remove_guide (mirror, GIMP_ORIENTATION_HORIZONTAL);
+
+      if (mirror->vertical_guide)
+        gimp_mirror_remove_guide (mirror, GIMP_ORIENTATION_VERTICAL);
+    }
+}
+
+static void
+gimp_mirror_set_horizontal_symmetry (GimpMirror *mirror,
+                                     gboolean    active)
+{
+  if (active == mirror->horizontal_mirror)
+    return;
+
+  mirror->horizontal_mirror = active;
+
+  if (active)
+    {
+      if (! mirror->horizontal_guide)
+        gimp_mirror_add_guide (mirror, GIMP_ORIENTATION_HORIZONTAL);
+    }
+  else if (! mirror->point_symmetry)
+    {
+      gimp_mirror_remove_guide (mirror, GIMP_ORIENTATION_HORIZONTAL);
+    }
+
+  gimp_mirror_reset (mirror);
+}
+
+static void
+gimp_mirror_set_vertical_symmetry (GimpMirror *mirror,
+                                   gboolean    active)
+{
+  if (active == mirror->vertical_mirror)
+    return;
+
+  mirror->vertical_mirror = active;
+
+  if (active)
+    {
+      if (! mirror->vertical_guide)
+        gimp_mirror_add_guide (mirror, GIMP_ORIENTATION_VERTICAL);
+    }
+  else if (! mirror->point_symmetry)
+    {
+      gimp_mirror_remove_guide (mirror, GIMP_ORIENTATION_VERTICAL);
+    }
+
+  gimp_mirror_reset (mirror);
+}
+
+static void
+gimp_mirror_set_point_symmetry (GimpMirror *mirror,
+                                gboolean    active)
+{
+  if (active == mirror->point_symmetry)
+    return;
+
+  mirror->point_symmetry = active;
+
+  if (active)
+    {
+      /* Show the horizontal guide unless already shown */
+      if (! mirror->horizontal_guide)
+        gimp_mirror_add_guide (mirror, GIMP_ORIENTATION_HORIZONTAL);
+
+      /* Show the vertical guide unless already shown */
+      if (! mirror->vertical_guide)
+        gimp_mirror_add_guide (mirror, GIMP_ORIENTATION_VERTICAL);
+    }
+  else
+    {
+      /* Remove the horizontal guide unless needed by horizontal mirror */
+      if (! mirror->horizontal_mirror)
+        gimp_mirror_remove_guide (mirror, GIMP_ORIENTATION_HORIZONTAL);
+
+      /* Remove the vertical guide unless needed by vertical mirror */
+      if (! mirror->vertical_mirror)
+        gimp_mirror_remove_guide (mirror, GIMP_ORIENTATION_VERTICAL);
+    }
+
+  gimp_mirror_reset (mirror);
+}
+
+static void
+gimp_mirror_image_size_changed_cb (GimpImage    *image,
+                                   gint          previous_origin_x,
+                                   gint          previous_origin_y,
+                                   gint          previous_width,
+                                   gint          previous_height,
+                                   GimpSymmetry *sym)
+{
+  if (previous_width != gimp_image_get_width (image) ||
+      previous_height != gimp_image_get_height (image))
+    {
+      g_signal_emit_by_name (sym, "gui-param-changed", sym->image);
+    }
+}