Drop support for offscreen GdkWindowswip/alexl/no-offscreen

These complicate a lot of GdkWindow internals to implement features
that not a lot of apps use, and will be better achieved using gsk.
So, we just drop it all.

4 files changed, 0 insertions, 1093 deletions

diff --git a/demos/gtk-demo/Makefile.am b/demos/gtk-demo/Makefile.am
index f470fc8172..b873418b2b 100644
--- a/demos/gtk-demo/Makefile.am
+++ b/demos/gtk-demo/Makefile.am
@@ -43,8 +43,6 @@ demos_base =					\
 	markup.c				\
 	menus.c					\
 	modelbutton.c				\
-	offscreen_window.c			\
-	offscreen_window2.c			\
 	overlay.c				\
 	overlay2.c				\
 	panes.c					\
diff --git a/demos/gtk-demo/demo.gresource.xml b/demos/gtk-demo/demo.gresource.xml
index f0c7201f3c..3bd3d9f968 100644
--- a/demos/gtk-demo/demo.gresource.xml
+++ b/demos/gtk-demo/demo.gresource.xml
@@ -167,8 +167,6 @@
     <file>markup.c</file>
     <file>menus.c</file>
     <file>modelbutton.c</file>
-    <file>offscreen_window.c</file>
-    <file>offscreen_window2.c</file>
     <file>overlay.c</file>
     <file>overlay2.c</file>
     <file>pagesetup.c</file>
diff --git a/demos/gtk-demo/offscreen_window.c b/demos/gtk-demo/offscreen_window.c
deleted file mode 100644
index 1affe04d1b..0000000000
--- a/demos/gtk-demo/offscreen_window.c
+++ /dev/null
@@ -1,586 +0,0 @@
-/* Offscreen Windows/Rotated Button
- *
- * Offscreen windows can be used to transform parts of a widget
- * hierarchy. Note that the rotated button is fully functional.
- */
-#include <math.h>
-#include <gtk/gtk.h>
-
-#define GTK_TYPE_ROTATED_BIN              (gtk_rotated_bin_get_type ())
-#define GTK_ROTATED_BIN(obj)              (G_TYPE_CHECK_INSTANCE_CAST ((obj), GTK_TYPE_ROTATED_BIN, GtkRotatedBin))
-#define GTK_ROTATED_BIN_CLASS(klass)      (G_TYPE_CHECK_CLASS_CAST ((klass), GTK_TYPE_ROTATED_BIN, GtkRotatedBinClass))
-#define GTK_IS_ROTATED_BIN(obj)           (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GTK_TYPE_ROTATED_BIN))
-#define GTK_IS_ROTATED_BIN_CLASS(klass)   (G_TYPE_CHECK_CLASS_TYPE ((klass), GTK_TYPE_ROTATED_BIN))
-#define GTK_ROTATED_BIN_GET_CLASS(obj)    (G_TYPE_INSTANCE_GET_CLASS ((obj), GTK_TYPE_ROTATED_BIN, GtkRotatedBinClass))
-
-typedef struct _GtkRotatedBin   GtkRotatedBin;
-typedef struct _GtkRotatedBinClass  GtkRotatedBinClass;
-
-struct _GtkRotatedBin
-{
-  GtkContainer container;
-
-  GtkWidget *child;
-  GdkWindow *offscreen_window;
-  gdouble angle;
-};
-
-struct _GtkRotatedBinClass
-{
-  GtkContainerClass parent_class;
-};
-
-GType      gtk_rotated_bin_get_type  (void) G_GNUC_CONST;
-GtkWidget* gtk_rotated_bin_new       (void);
-void       gtk_rotated_bin_set_angle (GtkRotatedBin *bin,
-                                      gdouble        angle);
-
-/*** implementation ***/
-
-static void     gtk_rotated_bin_realize       (GtkWidget       *widget);
-static void     gtk_rotated_bin_unrealize     (GtkWidget       *widget);
-static void     gtk_rotated_bin_measure       (GtkWidget       *widget,
-                                               GtkOrientation   orientation,
-                                               int              for_size,
-                                               int             *minimum,
-                                               int             *natural,
-                                               int             *minimum_baseline,
-                                               int             *natural_baseline);
-static void     gtk_rotated_bin_size_allocate (GtkWidget       *widget,
-                                               GtkAllocation   *allocation);
-static gboolean gtk_rotated_bin_damage        (GtkWidget       *widget,
-                                               GdkEventExpose  *event);
-static gboolean gtk_rotated_bin_draw          (GtkWidget       *widget,
-                                               cairo_t         *cr);
-
-static void     gtk_rotated_bin_add           (GtkContainer    *container,
-                                               GtkWidget       *child);
-static void     gtk_rotated_bin_remove        (GtkContainer    *container,
-                                               GtkWidget       *widget);
-static void     gtk_rotated_bin_forall        (GtkContainer    *container,
-                                               gboolean         include_internals,
-                                               GtkCallback      callback,
-                                               gpointer         callback_data);
-static GType    gtk_rotated_bin_child_type    (GtkContainer    *container);
-
-G_DEFINE_TYPE (GtkRotatedBin, gtk_rotated_bin, GTK_TYPE_CONTAINER);
-
-static void
-to_child (GtkRotatedBin *bin,
-          double         widget_x,
-          double         widget_y,
-          double        *x_out,
-          double        *y_out)
-{
-  GtkAllocation child_area;
-  double x, y, xr, yr;
-  double c, s;
-  double w, h;
-
-  s = sin (bin->angle);
-  c = cos (bin->angle);
-  gtk_widget_get_allocation (bin->child, &child_area);
-
-  w = c * child_area.width + s * child_area.height;
-  h = s * child_area.width + c * child_area.height;
-
-  x = widget_x;
-  y = widget_y;
-
-  x -= (w - child_area.width) / 2;
-  y -= (h - child_area.height) / 2;
-
-  x -= child_area.width / 2;
-  y -= child_area.height / 2;
-
-  xr = x * c + y * s;
-  yr = y * c - x * s;
-  x = xr;
-  y = yr;
-
-  x += child_area.width / 2;
-  y += child_area.height / 2;
-
-  *x_out = x;
-  *y_out = y;
-}
-
-static void
-to_parent (GtkRotatedBin *bin,
-           double         offscreen_x,
-           double         offscreen_y,
-           double        *x_out,
-           double        *y_out)
-{
-  GtkAllocation child_area;
-  double x, y, xr, yr;
-  double c, s;
-  double w, h;
-
-  s = sin (bin->angle);
-  c = cos (bin->angle);
-  gtk_widget_get_allocation (bin->child, &child_area);
-
-  w = c * child_area.width + s * child_area.height;
-  h = s * child_area.width + c * child_area.height;
-
-  x = offscreen_x;
-  y = offscreen_y;
-
-  x -= child_area.width / 2;
-  y -= child_area.height / 2;
-
-  xr = x * c - y * s;
-  yr = x * s + y * c;
-  x = xr;
-  y = yr;
-
-  x += child_area.width / 2;
-  y += child_area.height / 2;
-
-  x -= (w - child_area.width) / 2;
-  y -= (h - child_area.height) / 2;
-
-  *x_out = x;
-  *y_out = y;
-}
-
-static void
-gtk_rotated_bin_class_init (GtkRotatedBinClass *klass)
-{
-  GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
-  GtkContainerClass *container_class = GTK_CONTAINER_CLASS (klass);
-
-  widget_class->realize = gtk_rotated_bin_realize;
-  widget_class->unrealize = gtk_rotated_bin_unrealize;
-  widget_class->measure = gtk_rotated_bin_measure;
-  widget_class->size_allocate = gtk_rotated_bin_size_allocate;
-  widget_class->draw = gtk_rotated_bin_draw;
-
-  g_signal_override_class_closure (g_signal_lookup ("damage-event", GTK_TYPE_WIDGET),
-                                   GTK_TYPE_ROTATED_BIN,
-                                   g_cclosure_new (G_CALLBACK (gtk_rotated_bin_damage),
-                                                   NULL, NULL));
-
-  container_class->add = gtk_rotated_bin_add;
-  container_class->remove = gtk_rotated_bin_remove;
-  container_class->forall = gtk_rotated_bin_forall;
-  container_class->child_type = gtk_rotated_bin_child_type;
-}
-
-static void
-gtk_rotated_bin_init (GtkRotatedBin *bin)
-{
-  gtk_widget_set_has_window (GTK_WIDGET (bin), TRUE);
-}
-
-GtkWidget *
-gtk_rotated_bin_new (void)
-{
-  return g_object_new (GTK_TYPE_ROTATED_BIN, NULL);
-}
-
-static GdkWindow *
-pick_offscreen_child (GdkWindow     *offscreen_window,
-                      double         widget_x,
-                      double         widget_y,
-                      GtkRotatedBin *bin)
-{
- GtkAllocation child_area;
- double x, y;
-
- if (bin->child && gtk_widget_get_visible (bin->child))
-    {
-      to_child (bin, widget_x, widget_y, &x, &y);
-
-      gtk_widget_get_allocation (bin->child, &child_area);
-
-      if (x >= 0 && x < child_area.width &&
-          y >= 0 && y < child_area.height)
-        return bin->offscreen_window;
-    }
-
-  return NULL;
-}
-
-static void
-offscreen_window_to_parent (GdkWindow     *offscreen_window,
-                            double         offscreen_x,
-                            double         offscreen_y,
-                            double        *parent_x,
-                            double        *parent_y,
-                            GtkRotatedBin *bin)
-{
-  to_parent (bin, offscreen_x, offscreen_y, parent_x, parent_y);
-}
-
-static void
-offscreen_window_from_parent (GdkWindow     *window,
-                              double         parent_x,
-                              double         parent_y,
-                              double        *offscreen_x,
-                              double        *offscreen_y,
-                              GtkRotatedBin *bin)
-{
-  to_child (bin, parent_x, parent_y, offscreen_x, offscreen_y);
-}
-
-static void
-gtk_rotated_bin_realize (GtkWidget *widget)
-{
-  GtkRotatedBin *bin = GTK_ROTATED_BIN (widget);
-  GtkAllocation allocation;
-  GdkWindow *window;
-  GdkWindowAttr attributes;
-  gint attributes_mask;
-  GtkRequisition child_requisition;
-
-  gtk_widget_set_realized (widget, TRUE);
-
-  gtk_widget_get_allocation (widget, &allocation);
-
-  attributes.x = allocation.x;
-  attributes.y = allocation.y;
-  attributes.width = allocation.width;
-  attributes.height = allocation.height;
-  attributes.window_type = GDK_WINDOW_CHILD;
-  attributes.event_mask = gtk_widget_get_events (widget)
-                        | GDK_EXPOSURE_MASK
-                        | GDK_POINTER_MOTION_MASK
-                        | GDK_BUTTON_PRESS_MASK
-                        | GDK_BUTTON_RELEASE_MASK
-                        | GDK_SCROLL_MASK
-                        | GDK_ENTER_NOTIFY_MASK
-                        | GDK_LEAVE_NOTIFY_MASK;
-
-  attributes.wclass = GDK_INPUT_OUTPUT;
-
-  attributes_mask = GDK_WA_X | GDK_WA_Y;
-
-  window = gdk_window_new (gtk_widget_get_parent_window (widget),
-                           &attributes, attributes_mask);
-  gtk_widget_set_window (widget, window);
-  gdk_window_set_user_data (window, widget);
-  g_signal_connect (window, "pick-embedded-child",
-                    G_CALLBACK (pick_offscreen_child), bin);
-
-  attributes.window_type = GDK_WINDOW_OFFSCREEN;
-
-  child_requisition.width = child_requisition.height = 0;
-  if (bin->child && gtk_widget_get_visible (bin->child))
-    {
-      GtkAllocation child_allocation;
-
-      gtk_widget_get_allocation (bin->child, &child_allocation);
-      attributes.width = child_allocation.width;
-      attributes.height = child_allocation.height;
-    }
-  bin->offscreen_window = gdk_window_new (gdk_screen_get_root_window (gtk_widget_get_screen (widget)),
-                                          &attributes, attributes_mask);
-  gdk_window_set_user_data (bin->offscreen_window, widget);
-  if (bin->child)
-    gtk_widget_set_parent_window (bin->child, bin->offscreen_window);
-  gdk_offscreen_window_set_embedder (bin->offscreen_window, window);
-  g_signal_connect (bin->offscreen_window, "to-embedder",
-                    G_CALLBACK (offscreen_window_to_parent), bin);
-  g_signal_connect (bin->offscreen_window, "from-embedder",
-                    G_CALLBACK (offscreen_window_from_parent), bin);
-
-  gdk_window_show (bin->offscreen_window);
-}
-
-static void
-gtk_rotated_bin_unrealize (GtkWidget *widget)
-{
-  GtkRotatedBin *bin = GTK_ROTATED_BIN (widget);
-
-  gdk_window_set_user_data (bin->offscreen_window, NULL);
-  gdk_window_destroy (bin->offscreen_window);
-  bin->offscreen_window = NULL;
-
-  GTK_WIDGET_CLASS (gtk_rotated_bin_parent_class)->unrealize (widget);
-}
-
-static GType
-gtk_rotated_bin_child_type (GtkContainer *container)
-{
-  GtkRotatedBin *bin = GTK_ROTATED_BIN (container);
-
-  if (bin->child)
-    return G_TYPE_NONE;
-
-  return GTK_TYPE_WIDGET;
-}
-
-static void
-gtk_rotated_bin_add (GtkContainer *container,
-                     GtkWidget    *widget)
-{
-  GtkRotatedBin *bin = GTK_ROTATED_BIN (container);
-
-  if (!bin->child)
-    {
-      gtk_widget_set_parent_window (widget, bin->offscreen_window);
-      gtk_widget_set_parent (widget, GTK_WIDGET (bin));
-      bin->child = widget;
-    }
-  else
-    g_warning ("GtkRotatedBin cannot have more than one child");
-}
-
-static void
-gtk_rotated_bin_remove (GtkContainer *container,
-                        GtkWidget    *widget)
-{
-  GtkRotatedBin *bin = GTK_ROTATED_BIN (container);
-  gboolean was_visible;
-
-  was_visible = gtk_widget_get_visible (widget);
-
-  if (bin->child == widget)
-    {
-      gtk_widget_unparent (widget);
-
-      bin->child = NULL;
-
-      if (was_visible && gtk_widget_get_visible (GTK_WIDGET (container)))
-        gtk_widget_queue_resize (GTK_WIDGET (container));
-    }
-}
-
-static void
-gtk_rotated_bin_forall (GtkContainer *container,
-                        gboolean      include_internals,
-                        GtkCallback   callback,
-                        gpointer      callback_data)
-{
-  GtkRotatedBin *bin = GTK_ROTATED_BIN (container);
-
-  g_return_if_fail (callback != NULL);
-
-  if (bin->child)
-    (*callback) (bin->child, callback_data);
-}
-
-void
-gtk_rotated_bin_set_angle (GtkRotatedBin *bin,
-                           gdouble        angle)
-{
-  g_return_if_fail (GTK_IS_ROTATED_BIN (bin));
-
-  bin->angle = angle;
-  gtk_widget_queue_resize (GTK_WIDGET (bin));
-
-  gdk_window_geometry_changed (bin->offscreen_window);
-}
-
-static void
-gtk_rotated_bin_size_request (GtkWidget      *widget,
-                              GtkRequisition *requisition)
-{
-  GtkRotatedBin *bin = GTK_ROTATED_BIN (widget);
-  GtkRequisition child_requisition;
-  double s, c;
-
-  child_requisition.width = 0;
-  child_requisition.height = 0;
-
-  if (bin->child && gtk_widget_get_visible (bin->child))
-    gtk_widget_get_preferred_size ( (bin->child),
-                               &child_requisition, NULL);
-
-  s = sin (bin->angle);
-  c = cos (bin->angle);
-  requisition->width = c * child_requisition.width + s * child_requisition.height;
-  requisition->height = s * child_requisition.width + c * child_requisition.height;
-}
-
-static void
-gtk_rotated_bin_measure (GtkWidget       *widget,
-                         GtkOrientation   orientation,
-                         int              for_size,
-                         int             *minimum,
-                         int             *natural,
-                         int             *minimum_baseline,
-                         int             *natural_baseline)
-{
-  GtkRequisition requisition;
-
-  gtk_rotated_bin_size_request (widget, &requisition);
-
-  if (orientation == GTK_ORIENTATION_HORIZONTAL)
-    *minimum = *natural = requisition.width;
-  else
-    *minimum = *natural = requisition.height;
-}
-
-static void
-gtk_rotated_bin_size_allocate (GtkWidget     *widget,
-                               GtkAllocation *allocation)
-{
-  GtkRotatedBin *bin = GTK_ROTATED_BIN (widget);
-  gint w, h;
-  gdouble s, c;
-
-  gtk_widget_set_allocation (widget, allocation);
-
-  w = allocation->width;
-  h = allocation->height;
-
-  if (gtk_widget_get_realized (widget))
-    gdk_window_move_resize (gtk_widget_get_window (widget),
-                            allocation->x,
-                            allocation->y,
-                            w, h);
-
-  if (bin->child && gtk_widget_get_visible (bin->child))
-    {
-      GtkRequisition child_requisition;
-      GtkAllocation child_allocation;
-
-      s = sin (bin->angle);
-      c = cos (bin->angle);
-
-      gtk_widget_get_preferred_size (bin->child,
-                                     &child_requisition, NULL);
-      child_allocation.x = 0;
-      child_allocation.y = 0;
-      child_allocation.height = child_requisition.height;
-      if (c == 0.0)
-        child_allocation.width = h / s;
-      else if (s == 0.0)
-        child_allocation.width = w / c;
-      else
-        child_allocation.width = MIN ((w - s * child_allocation.height) / c,
-                                      (h - c * child_allocation.height) / s);
-
-      if (gtk_widget_get_realized (widget))
-        gdk_window_move_resize (bin->offscreen_window,
-                                child_allocation.x,
-                                child_allocation.y,
-                                child_allocation.width,
-                                child_allocation.height);
-
-      child_allocation.x = child_allocation.y = 0;
-      gtk_widget_size_allocate (bin->child, &child_allocation);
-    }
-}
-
-static gboolean
-gtk_rotated_bin_damage (GtkWidget      *widget,
-                        GdkEventExpose *event)
-{
-  gdk_window_invalidate_rect (gtk_widget_get_window (widget),
-                              NULL, FALSE);
-
-  return TRUE;
-}
-
-static gboolean
-gtk_rotated_bin_draw (GtkWidget *widget,
-                      cairo_t   *cr)
-{
-  GtkRotatedBin *bin = GTK_ROTATED_BIN (widget);
-  GdkWindow *window;
-  gdouble s, c;
-  gdouble w, h;
-
-  window = gtk_widget_get_window (widget);
-  if (gtk_cairo_should_draw_window (cr, window))
-    {
-      cairo_surface_t *surface;
-      GtkAllocation child_area;
-
-      if (bin->child && gtk_widget_get_visible (bin->child))
-        {
-          surface = gdk_offscreen_window_get_surface (bin->offscreen_window);
-          gtk_widget_get_allocation (bin->child, &child_area);
-
-          /* transform */
-          s = sin (bin->angle);
-          c = cos (bin->angle);
-          w = c * child_area.width + s * child_area.height;
-          h = s * child_area.width + c * child_area.height;
-
-          cairo_translate (cr, (w - child_area.width) / 2, (h - child_area.height) / 2);
-          cairo_translate (cr, child_area.width / 2, child_area.height / 2);
-          cairo_rotate (cr, bin->angle);
-          cairo_translate (cr, -child_area.width / 2, -child_area.height / 2);
-
-          /* clip */
-          cairo_rectangle (cr,
-                           0, 0,
-                           gdk_window_get_width (bin->offscreen_window),
-                           gdk_window_get_height (bin->offscreen_window));
-          cairo_clip (cr);
-          /* paint */
-          cairo_set_source_surface (cr, surface, 0, 0);
-          cairo_paint (cr);
-        }
-    }
-  if (gtk_cairo_should_draw_window (cr, bin->offscreen_window))
-    {
-      gtk_render_background (gtk_widget_get_style_context (widget),
-                             cr,
-                             0, 0,
-                             gdk_window_get_width (bin->offscreen_window),
-                             gdk_window_get_height (bin->offscreen_window));
-
-      if (bin->child)
-        gtk_container_propagate_draw (GTK_CONTAINER (widget),
-                                      bin->child,
-                                      cr);
-    }
-
-  return FALSE;
-}
-
-/*** ***/
-
-static void
-scale_changed (GtkRange      *range,
-               GtkRotatedBin *bin)
-{
-  gtk_rotated_bin_set_angle (bin, gtk_range_get_value (range));
-}
-
-GtkWidget *
-do_offscreen_window (GtkWidget *do_widget)
-{
-  static GtkWidget *window = NULL;
-
-  if (!window)
-    {
-      GtkWidget *bin, *vbox, *scale, *button;
-
-      window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
-      gtk_window_set_screen (GTK_WINDOW (window),
-                             gtk_widget_get_screen (do_widget));
-      gtk_window_set_title (GTK_WINDOW (window), "Rotated Button");
-
-      g_signal_connect (window, "destroy",
-                        G_CALLBACK (gtk_widget_destroyed), &window);
-
-      vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
-      scale = gtk_scale_new_with_range (GTK_ORIENTATION_HORIZONTAL,
-                                        0, G_PI/2, 0.01);
-      gtk_scale_set_draw_value (GTK_SCALE (scale), FALSE);
-
-      button = gtk_button_new_with_label ("A Button");
-      bin = gtk_rotated_bin_new ();
-
-      g_signal_connect (scale, "value-changed", G_CALLBACK (scale_changed), bin);
-
-      gtk_container_add (GTK_CONTAINER (window), vbox);
-      gtk_box_pack_start (GTK_BOX (vbox), scale, FALSE, FALSE);
-      gtk_box_pack_start (GTK_BOX (vbox), bin, TRUE, TRUE);
-      gtk_container_add (GTK_CONTAINER (bin), button);
-    }
-
-  if (!gtk_widget_get_visible (window))
-    gtk_widget_show_all (window);
-  else
-    gtk_widget_destroy (window);
-
-  return window;
-}
diff --git a/demos/gtk-demo/offscreen_window2.c b/demos/gtk-demo/offscreen_window2.c
deleted file mode 100644
index 22bbe5237e..0000000000
--- a/demos/gtk-demo/offscreen_window2.c
+++ /dev/null
@@ -1,503 +0,0 @@
-/* Offscreen Windows/Effects
- *
- * Offscreen windows can be used to render elements multiple times to achieve
- * various effects.
- */
-#include <glib/gi18n.h>
-#include <gtk/gtk.h>
-
-#define GTK_TYPE_MIRROR_BIN              (gtk_mirror_bin_get_type ())
-#define GTK_MIRROR_BIN(obj)              (G_TYPE_CHECK_INSTANCE_CAST ((obj), GTK_TYPE_MIRROR_BIN, GtkMirrorBin))
-#define GTK_MIRROR_BIN_CLASS(klass)      (G_TYPE_CHECK_CLASS_CAST ((klass), GTK_TYPE_MIRROR_BIN, GtkMirrorBinClass))
-#define GTK_IS_MIRROR_BIN(obj)           (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GTK_TYPE_MIRROR_BIN))
-#define GTK_IS_MIRROR_BIN_CLASS(klass)   (G_TYPE_CHECK_CLASS_TYPE ((klass), GTK_TYPE_MIRROR_BIN))
-#define GTK_MIRROR_BIN_GET_CLASS(obj)    (G_TYPE_INSTANCE_GET_CLASS ((obj), GTK_TYPE_MIRROR_BIN, GtkMirrorBinClass))
-
-typedef struct _GtkMirrorBin   GtkMirrorBin;
-typedef struct _GtkMirrorBinClass  GtkMirrorBinClass;
-
-struct _GtkMirrorBin
-{
-  GtkContainer container;
-
-  GtkWidget *child;
-  GdkWindow *offscreen_window;
-};
-
-struct _GtkMirrorBinClass
-{
-  GtkContainerClass parent_class;
-};
-
-GType      gtk_mirror_bin_get_type  (void) G_GNUC_CONST;
-GtkWidget* gtk_mirror_bin_new       (void);
-
-/*** implementation ***/
-
-static void     gtk_mirror_bin_realize       (GtkWidget       *widget);
-static void     gtk_mirror_bin_unrealize     (GtkWidget       *widget);
-static void     gtk_mirror_bin_measure       (GtkWidget       *widget,
-                                              GtkOrientation   orientation,
-                                              int              for_size,
-                                              int             *minimum,
-                                              int             *natural,
-                                              int             *minimum_baseline,
-                                              int             *natural_baseline);
-static void     gtk_mirror_bin_size_allocate (GtkWidget       *widget,
-                                               GtkAllocation   *allocation);
-static gboolean gtk_mirror_bin_damage        (GtkWidget       *widget,
-                                               GdkEventExpose  *event);
-static gboolean gtk_mirror_bin_draw          (GtkWidget       *widget,
-                                              cairo_t         *cr);
-
-static void     gtk_mirror_bin_add           (GtkContainer    *container,
-                                               GtkWidget       *child);
-static void     gtk_mirror_bin_remove        (GtkContainer    *container,
-                                               GtkWidget       *widget);
-static void     gtk_mirror_bin_forall        (GtkContainer    *container,
-                                               gboolean         include_internals,
-                                               GtkCallback      callback,
-                                               gpointer         callback_data);
-static GType    gtk_mirror_bin_child_type    (GtkContainer    *container);
-
-G_DEFINE_TYPE (GtkMirrorBin, gtk_mirror_bin, GTK_TYPE_CONTAINER);
-
-static void
-to_child (GtkMirrorBin *bin,
-          double         widget_x,
-          double         widget_y,
-          double        *x_out,
-          double        *y_out)
-{
-  *x_out = widget_x;
-  *y_out = widget_y;
-}
-
-static void
-to_parent (GtkMirrorBin *bin,
-           double         offscreen_x,
-           double         offscreen_y,
-           double        *x_out,
-           double        *y_out)
-{
-  *x_out = offscreen_x;
-  *y_out = offscreen_y;
-}
-
-static void
-gtk_mirror_bin_class_init (GtkMirrorBinClass *klass)
-{
-  GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
-  GtkContainerClass *container_class = GTK_CONTAINER_CLASS (klass);
-
-  widget_class->realize = gtk_mirror_bin_realize;
-  widget_class->unrealize = gtk_mirror_bin_unrealize;
-  widget_class->measure = gtk_mirror_bin_measure;
-  widget_class->size_allocate = gtk_mirror_bin_size_allocate;
-  widget_class->draw = gtk_mirror_bin_draw;
-
-  g_signal_override_class_closure (g_signal_lookup ("damage-event", GTK_TYPE_WIDGET),
-                                   GTK_TYPE_MIRROR_BIN,
-                                   g_cclosure_new (G_CALLBACK (gtk_mirror_bin_damage),
-                                                   NULL, NULL));
-
-  container_class->add = gtk_mirror_bin_add;
-  container_class->remove = gtk_mirror_bin_remove;
-  container_class->forall = gtk_mirror_bin_forall;
-  container_class->child_type = gtk_mirror_bin_child_type;
-}
-
-static void
-gtk_mirror_bin_init (GtkMirrorBin *bin)
-{
-  gtk_widget_set_has_window (GTK_WIDGET (bin), TRUE);
-}
-
-GtkWidget *
-gtk_mirror_bin_new (void)
-{
-  return g_object_new (GTK_TYPE_MIRROR_BIN, NULL);
-}
-
-static GdkWindow *
-pick_offscreen_child (GdkWindow     *offscreen_window,
-                      double         widget_x,
-                      double         widget_y,
-                      GtkMirrorBin *bin)
-{
- GtkAllocation child_area;
- double x, y;
-
- if (bin->child && gtk_widget_get_visible (bin->child))
-    {
-      to_child (bin, widget_x, widget_y, &x, &y);
-
-      gtk_widget_get_allocation (bin->child, &child_area);
-
-      if (x >= 0 && x < child_area.width &&
-          y >= 0 && y < child_area.height)
-        return bin->offscreen_window;
-    }
-
-  return NULL;
-}
-
-static void
-offscreen_window_to_parent (GdkWindow     *offscreen_window,
-                            double         offscreen_x,
-                            double         offscreen_y,
-                            double        *parent_x,
-                            double        *parent_y,
-                            GtkMirrorBin *bin)
-{
-  to_parent (bin, offscreen_x, offscreen_y, parent_x, parent_y);
-}
-
-static void
-offscreen_window_from_parent (GdkWindow     *window,
-                              double         parent_x,
-                              double         parent_y,
-                              double        *offscreen_x,
-                              double        *offscreen_y,
-                              GtkMirrorBin *bin)
-{
-  to_child (bin, parent_x, parent_y, offscreen_x, offscreen_y);
-}
-
-static void
-gtk_mirror_bin_realize (GtkWidget *widget)
-{
-  GtkMirrorBin *bin = GTK_MIRROR_BIN (widget);
-  GtkAllocation allocation;
-  GdkWindow *window;
-  GdkWindowAttr attributes;
-  gint attributes_mask;
-  GtkRequisition child_requisition;
-
-  gtk_widget_set_realized (widget, TRUE);
-
-  gtk_widget_get_allocation (widget, &allocation);
-
-  attributes.x = allocation.x;
-  attributes.y = allocation.y;
-  attributes.width = allocation.width;
-  attributes.height = allocation.height;
-  attributes.window_type = GDK_WINDOW_CHILD;
-  attributes.event_mask = gtk_widget_get_events (widget)
-                        | GDK_EXPOSURE_MASK
-                        | GDK_POINTER_MOTION_MASK
-                        | GDK_BUTTON_PRESS_MASK
-                        | GDK_BUTTON_RELEASE_MASK
-                        | GDK_SCROLL_MASK
-                        | GDK_ENTER_NOTIFY_MASK
-                        | GDK_LEAVE_NOTIFY_MASK;
-
-  attributes.wclass = GDK_INPUT_OUTPUT;
-
-  attributes_mask = GDK_WA_X | GDK_WA_Y;
-
-  window = gdk_window_new (gtk_widget_get_parent_window (widget),
-                           &attributes, attributes_mask);
-  gtk_widget_set_window (widget, window);
-  gdk_window_set_user_data (window, widget);
-  g_signal_connect (window, "pick-embedded-child",
-                    G_CALLBACK (pick_offscreen_child), bin);
-
-  attributes.window_type = GDK_WINDOW_OFFSCREEN;
-
-  child_requisition.width = child_requisition.height = 0;
-  if (bin->child && gtk_widget_get_visible (bin->child))
-    {
-      GtkAllocation child_allocation;
-
-      gtk_widget_get_allocation (bin->child, &child_allocation);
-      attributes.width = child_allocation.width;
-      attributes.height = child_allocation.height;
-    }
-  bin->offscreen_window = gdk_window_new (gdk_screen_get_root_window (gtk_widget_get_screen (widget)),
-                                          &attributes, attributes_mask);
-  gdk_window_set_user_data (bin->offscreen_window, widget);
-  if (bin->child)
-    gtk_widget_set_parent_window (bin->child, bin->offscreen_window);
-  gdk_offscreen_window_set_embedder (bin->offscreen_window, window);
-  g_signal_connect (bin->offscreen_window, "to-embedder",
-                    G_CALLBACK (offscreen_window_to_parent), bin);
-  g_signal_connect (bin->offscreen_window, "from-embedder",
-                    G_CALLBACK (offscreen_window_from_parent), bin);
-
-  gdk_window_show (bin->offscreen_window);
-}
-
-static void
-gtk_mirror_bin_unrealize (GtkWidget *widget)
-{
-  GtkMirrorBin *bin = GTK_MIRROR_BIN (widget);
-
-  gdk_window_set_user_data (bin->offscreen_window, NULL);
-  gdk_window_destroy (bin->offscreen_window);
-  bin->offscreen_window = NULL;
-
-  GTK_WIDGET_CLASS (gtk_mirror_bin_parent_class)->unrealize (widget);
-}
-
-static GType
-gtk_mirror_bin_child_type (GtkContainer *container)
-{
-  GtkMirrorBin *bin = GTK_MIRROR_BIN (container);
-
-  if (bin->child)
-    return G_TYPE_NONE;
-
-  return GTK_TYPE_WIDGET;
-}
-
-static void
-gtk_mirror_bin_add (GtkContainer *container,
-                     GtkWidget    *widget)
-{
-  GtkMirrorBin *bin = GTK_MIRROR_BIN (container);
-
-  if (!bin->child)
-    {
-      gtk_widget_set_parent_window (widget, bin->offscreen_window);
-      gtk_widget_set_parent (widget, GTK_WIDGET (bin));
-      bin->child = widget;
-    }
-  else
-    g_warning ("GtkMirrorBin cannot have more than one child");
-}
-
-static void
-gtk_mirror_bin_remove (GtkContainer *container,
-                        GtkWidget    *widget)
-{
-  GtkMirrorBin *bin = GTK_MIRROR_BIN (container);
-  gboolean was_visible;
-
-  was_visible = gtk_widget_get_visible (widget);
-
-  if (bin->child == widget)
-    {
-      gtk_widget_unparent (widget);
-
-      bin->child = NULL;
-
-      if (was_visible && gtk_widget_get_visible (GTK_WIDGET (container)))
-        gtk_widget_queue_resize (GTK_WIDGET (container));
-    }
-}
-
-static void
-gtk_mirror_bin_forall (GtkContainer *container,
-                        gboolean      include_internals,
-                        GtkCallback   callback,
-                        gpointer      callback_data)
-{
-  GtkMirrorBin *bin = GTK_MIRROR_BIN (container);
-
-  g_return_if_fail (callback != NULL);
-
-  if (bin->child)
-    (*callback) (bin->child, callback_data);
-}
-
-static void
-gtk_mirror_bin_size_request (GtkWidget      *widget,
-                              GtkRequisition *requisition)
-{
-  GtkMirrorBin *bin = GTK_MIRROR_BIN (widget);
-  GtkRequisition child_requisition;
-
-  child_requisition.width = 0;
-  child_requisition.height = 0;
-
-  if (bin->child && gtk_widget_get_visible (bin->child))
-    gtk_widget_get_preferred_size ( (bin->child),
-                               &child_requisition, NULL);
-
-  requisition->width = child_requisition.width + 10;
-  requisition->height = child_requisition.height * 2 + 10;
-}
-
-static void
-gtk_mirror_bin_measure (GtkWidget       *widget,
-                        GtkOrientation   orientation,
-                        int              for_size,
-                        int             *minimum,
-                        int             *natural,
-                        int             *minimum_baseline,
-                        int             *natural_baseline)
-{
-  GtkRequisition requisition;
-
-  gtk_mirror_bin_size_request (widget, &requisition);
-
-  if (orientation == GTK_ORIENTATION_HORIZONTAL)
-    *minimum = *natural = requisition.width;
-  else
-    *minimum = *natural = requisition.height;
-}
-
-static void
-gtk_mirror_bin_size_allocate (GtkWidget     *widget,
-                               GtkAllocation *allocation)
-{
-  GtkMirrorBin *bin = GTK_MIRROR_BIN (widget);
-  gint w, h;
-
-  gtk_widget_set_allocation (widget, allocation);
-
-  w = allocation->width;
-  h = allocation->height;
-
-  if (gtk_widget_get_realized (widget))
-    gdk_window_move_resize (gtk_widget_get_window (widget),
-                            allocation->x,
-                            allocation->y,
-                            w, h);
-
-  if (bin->child && gtk_widget_get_visible (bin->child))
-    {
-      GtkRequisition child_requisition;
-      GtkAllocation child_allocation;
-
-      gtk_widget_get_preferred_size (bin->child,
-                                     &child_requisition, NULL);
-      child_allocation.x = 0;
-      child_allocation.y = 0;
-      child_allocation.height = child_requisition.height;
-      child_allocation.width = child_requisition.width;
-
-      if (gtk_widget_get_realized (widget))
-        gdk_window_move_resize (bin->offscreen_window,
-                                allocation->x,
-                                allocation->y,
-                                child_allocation.width, child_allocation.height);
-      gtk_widget_size_allocate (bin->child, &child_allocation);
-    }
-}
-
-static gboolean
-gtk_mirror_bin_damage (GtkWidget      *widget,
-                        GdkEventExpose *event)
-{
-  gdk_window_invalidate_rect (gtk_widget_get_window (widget),
-                              NULL, FALSE);
-
-  return TRUE;
-}
-
-static gboolean
-gtk_mirror_bin_draw (GtkWidget *widget,
-                     cairo_t   *cr)
-{
-  GtkMirrorBin *bin = GTK_MIRROR_BIN (widget);
-  GdkWindow *window;
-
-  window = gtk_widget_get_window (widget);
-  if (gtk_cairo_should_draw_window (cr, window))
-    {
-      cairo_surface_t *surface;
-      cairo_matrix_t matrix;
-      cairo_pattern_t *mask;
-      int height;
-
-      if (bin->child && gtk_widget_get_visible (bin->child))
-        {
-          surface = gdk_offscreen_window_get_surface (bin->offscreen_window);
-          height = gdk_window_get_height (bin->offscreen_window);
-
-          /* paint the offscreen child */
-          cairo_set_source_surface (cr, surface, 0, 0);
-          cairo_paint (cr);
-
-          cairo_matrix_init (&matrix, 1.0, 0.0, 0.3, 1.0, 0.0, 0.0);
-          cairo_matrix_scale (&matrix, 1.0, -1.0);
-          cairo_matrix_translate (&matrix, -10, - 3 * height - 10);
-          cairo_transform (cr, &matrix);
-
-          cairo_set_source_surface (cr, surface, 0, height);
-
-          /* create linear gradient as mask-pattern to fade out the source */
-          mask = cairo_pattern_create_linear (0.0, height, 0.0, 2*height);
-          cairo_pattern_add_color_stop_rgba (mask, 0.0,  0.0, 0.0, 0.0, 0.0);
-          cairo_pattern_add_color_stop_rgba (mask, 0.25, 0.0, 0.0, 0.0, 0.01);
-          cairo_pattern_add_color_stop_rgba (mask, 0.5,  0.0, 0.0, 0.0, 0.25);
-          cairo_pattern_add_color_stop_rgba (mask, 0.75, 0.0, 0.0, 0.0, 0.5);
-          cairo_pattern_add_color_stop_rgba (mask, 1.0,  0.0, 0.0, 0.0, 1.0);
-
-          /* paint the reflection */
-          cairo_mask (cr, mask);
-
-          cairo_pattern_destroy (mask);
-        }
-    }
-  else if (gtk_cairo_should_draw_window (cr, bin->offscreen_window))
-    {
-      gtk_render_background (gtk_widget_get_style_context (widget),
-                             cr,
-                             0, 0,
-                             gdk_window_get_width (bin->offscreen_window),
-                             gdk_window_get_height (bin->offscreen_window));
-
-      if (bin->child)
-        gtk_container_propagate_draw (GTK_CONTAINER (widget),
-                                      bin->child,
-                                      cr);
-    }
-
-  return FALSE;
-}
-
-/*** ***/
-
-GtkWidget *
-do_offscreen_window2 (GtkWidget *do_widget)
-{
-  static GtkWidget *window = NULL;
-
-  if (!window)
-    {
-      GtkWidget *bin, *vbox;
-      GtkWidget *hbox, *entry, *applybutton, *backbutton;
-      GtkSizeGroup *group;
-
-      window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
-      gtk_window_set_screen (GTK_WINDOW (window),
-                             gtk_widget_get_screen (do_widget));
-      gtk_window_set_title (GTK_WINDOW (window), "Effects");
-
-      g_signal_connect (window, "destroy",
-                        G_CALLBACK (gtk_widget_destroyed), &window);
-
-      vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
-
-      bin = gtk_mirror_bin_new ();
-
-      group = gtk_size_group_new (GTK_SIZE_GROUP_VERTICAL);
-
-      hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 6);
-      backbutton = gtk_button_new ();
-      gtk_container_add (GTK_CONTAINER (backbutton),
-                         gtk_image_new_from_icon_name ("go-previous", 4));
-      gtk_size_group_add_widget (group, backbutton);
-      entry = gtk_entry_new ();
-      gtk_size_group_add_widget (group, entry);
-      applybutton = gtk_button_new_with_label (_("Apply"));
-      gtk_size_group_add_widget (group, applybutton);
-
-      gtk_container_add (GTK_CONTAINER (window), vbox);
-      gtk_box_pack_start (GTK_BOX (vbox), bin, TRUE, TRUE);
-      gtk_container_add (GTK_CONTAINER (bin), hbox);
-      gtk_box_pack_start (GTK_BOX (hbox), backbutton, FALSE, FALSE);
-      gtk_box_pack_start (GTK_BOX (hbox), entry, TRUE, TRUE);
-      gtk_box_pack_start (GTK_BOX (hbox), applybutton, FALSE, FALSE);
-    }
-
-  if (!gtk_widget_get_visible (window))
-    gtk_widget_show_all (window);
-  else
-    gtk_widget_destroy (window);
-
-  return window;
-}