New file, just a quick hack of the X11 version.

2000-05-02  Tor Lillqvist  <tml@iki.fi>

* gdk/win32/gdkgeometry-win32.c: New file, just a quick hack of
the X11 version.

1 files changed, 702 insertions, 0 deletions

diff --git a/gdk/win32/gdkgeometry-win32.c b/gdk/win32/gdkgeometry-win32.c
new file mode 100644
index 0000000000..fc7df85fb6
--- /dev/null
+++ b/gdk/win32/gdkgeometry-win32.c
@@ -0,0 +1,702 @@
+/* GDK - The GIMP Drawing Kit
+ * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+/* gdkgeometry-win32.c: emulation of 32 bit coordinates within the
+ * limits of Win32 GDI. Just a copy of the X11 version, more or less.
+ * Probably totally bogus in functionality. Just a quick hack, to
+ * get the thing to build. Need to write some test code for it.
+ * Well, need to find out what it is supposed to do first ;-)
+ *
+ * The X11 version by Owen Taylor <otaylor@redhat.com>
+ * Copyright Red Hat, Inc. 2000
+ * Win32 hack by Tor Lillqvist <tml@iki.fi>
+ */
+
+#include "gdk.h"		/* For gdk_rectangle_intersect */
+#include "gdkregion.h"
+#include "gdkregion-generic.h"
+#include "gdkinternals.h"
+#include "gdkprivate-win32.h"
+
+typedef struct _GdkWindowQueueItem GdkWindowQueueItem;
+typedef struct _GdkWindowParentPos GdkWindowParentPos;
+
+typedef enum {
+  GDK_WINDOW_QUEUE_TRANSLATE,
+  GDK_WINDOW_QUEUE_ANTIEXPOSE
+} GdkWindowQueueType;
+
+struct _GdkWindowQueueItem
+{
+  GdkWindow *window;
+  gulong serial;
+  GdkWindowQueueType type;
+  union {
+    struct {
+      gint dx;
+      gint dy;
+    } translate;
+    struct {
+      GdkRegion *area;
+    } antiexpose;
+  } u;
+};
+
+struct _GdkWindowParentPos
+{
+  gint x;
+  gint y;
+  gint win32_x;
+  gint win32_y;
+  GdkRectangle clip_rect;
+};
+
+static void gdk_window_compute_position   (GdkWindow            *window,
+					   GdkWindowParentPos   *parent_pos,
+					   GdkWin32PositionInfo *info);
+static void gdk_window_compute_parent_pos (GdkWindow          *window,
+					   GdkWindowParentPos *parent_pos);
+static void gdk_window_premove            (GdkWindow          *window,
+					   GdkWindowParentPos *parent_pos);
+static void gdk_window_postmove           (GdkWindow          *window,
+					   GdkWindowParentPos *parent_pos);
+static void gdk_window_queue_translation  (GdkWindow          *window,
+					   gint                dx,
+					   gint                dy);
+static void gdk_window_tmp_unset_bg       (GdkWindow          *window);
+static void gdk_window_tmp_reset_bg       (GdkWindow          *window);
+static void gdk_window_clip_changed       (GdkWindow          *window,
+					   GdkRectangle       *old_clip,
+					   GdkRectangle       *new_clip);
+
+static GSList *translate_queue = NULL;
+
+void
+_gdk_windowing_window_get_offsets (GdkWindow *window,
+				   gint      *x_offset,
+				   gint      *y_offset)
+{
+  GdkWindowWin32Data *data = GDK_WINDOW_WIN32DATA (window);
+
+  *x_offset = data->position_info.x_offset;
+  *y_offset = data->position_info.y_offset;
+}
+
+void
+_gdk_window_init_position (GdkWindow *window)
+{
+  GdkWindowWin32Data *data;
+  GdkWindowParentPos parent_pos;
+
+  g_return_if_fail (window != NULL);
+  g_return_if_fail (GDK_IS_WINDOW (window));
+
+  data = GDK_WINDOW_WIN32DATA (window);
+
+  gdk_window_compute_parent_pos (window, &parent_pos);
+  gdk_window_compute_position (window, &parent_pos, &data->position_info);
+}
+
+void
+_gdk_window_move_resize_child (GdkWindow *window,
+			       gint       x,
+			       gint       y,
+			       gint       width,
+			       gint       height)
+{
+  GdkWindowPrivate *private = (GdkWindowPrivate *)window;
+  GdkWin32PositionInfo new_info;
+  GdkWindowParentPos parent_pos;
+  GdkWindowWin32Data *data;
+  RECT rect;
+  GList *tmp_list;
+  gint d_xoffset, d_yoffset;
+  gint dx, dy;
+  gboolean is_move;
+  gboolean is_resize;
+  
+  g_return_if_fail (window != NULL);
+  g_return_if_fail (GDK_IS_WINDOW (window));
+
+  data = GDK_WINDOW_WIN32DATA (window);
+
+  dx = x - private->x;
+  dy = y - private->y;
+  
+  is_move = dx != 0 || dy != 0;
+  is_resize = private->drawable.width != width || private->drawable.height != height;
+
+  if (!is_move && !is_resize)
+    return;
+  
+  private->x = x;
+  private->y = y;
+  private->drawable.width = width;
+  private->drawable.height = height;
+
+  gdk_window_compute_parent_pos (window, &parent_pos);
+  gdk_window_compute_position (window, &parent_pos, &new_info);
+
+  gdk_window_clip_changed (window, &data->position_info.clip_rect, &new_info.clip_rect);
+
+  parent_pos.x += private->x;
+  parent_pos.y += private->y;
+  parent_pos.win32_x += new_info.x;
+  parent_pos.win32_y += new_info.y;
+  parent_pos.clip_rect = new_info.clip_rect;
+
+  d_xoffset = new_info.x_offset - data->position_info.x_offset;
+  d_yoffset = new_info.y_offset - data->position_info.y_offset;
+  
+  if (d_xoffset != 0 || d_yoffset != 0)
+    {
+      gint new_x0, new_y0, new_x1, new_y1;
+
+      gdk_window_set_static_gravities (window, TRUE);
+
+      if (d_xoffset < 0 || d_yoffset < 0)
+	gdk_window_queue_translation (window, MIN (d_xoffset, 0), MIN (d_yoffset, 0));
+	
+      if (d_xoffset < 0)
+	{
+	  new_x0 = data->position_info.x + d_xoffset;
+	  new_x1 = data->position_info.x + data->position_info.width;
+	}
+      else
+	{
+	  new_x0 = data->position_info.x;
+	  new_x1 = data->position_info.x + new_info.width + d_xoffset;
+	}
+
+      if (d_yoffset < 0)
+	{
+	  new_y0 = data->position_info.y + d_yoffset;
+	  new_y1 = data->position_info.y + data->position_info.height;
+	}
+      else
+	{
+	  new_y0 = data->position_info.y;
+	  new_y1 = data->position_info.y + new_info.height + d_yoffset;
+	}
+      
+      if (!MoveWindow (GDK_DRAWABLE_XID (window),
+		       new_x0, new_y0, new_x1 - new_x0, new_y1 - new_y0,
+		       FALSE))
+	  WIN32_API_FAILED ("MoveWindow");
+      
+      tmp_list = private->children;
+      while (tmp_list)
+	{
+	  gdk_window_premove (tmp_list->data, &parent_pos);
+	  tmp_list = tmp_list->next;
+	}
+
+      GetClientRect (GDK_DRAWABLE_XID (window), &rect);
+
+      if (!MoveWindow (GDK_DRAWABLE_XID (window),
+		       new_x0 + dx, new_y0 + dy,
+		       rect.right - rect.left, rect.bottom - rect.top,
+		       FALSE))
+	  WIN32_API_FAILED ("MoveWindow");
+      
+      if (d_xoffset > 0 || d_yoffset > 0)
+	gdk_window_queue_translation (window, MAX (d_xoffset, 0), MAX (d_yoffset, 0));
+      
+      if (!MoveWindow (GDK_DRAWABLE_XID (window),
+		       new_info.x, new_info.y, new_info.width, new_info.height,
+		       FALSE))
+	  WIN32_API_FAILED ("MoveWindow");
+      
+      if (data->position_info.no_bg)
+	gdk_window_tmp_reset_bg (window);
+
+      if (!data->position_info.mapped && new_info.mapped && private->mapped)
+	ShowWindow (GDK_DRAWABLE_XID (window), SW_SHOWNA);
+      
+      data->position_info = new_info;
+      
+      tmp_list = private->children;
+      while (tmp_list)
+	{
+	  gdk_window_postmove (tmp_list->data, &parent_pos);
+	  tmp_list = tmp_list->next;
+	}
+    }
+  else
+    {
+      if (is_move && is_resize)
+	gdk_window_set_static_gravities (window, FALSE);
+
+      if (data->position_info.mapped && !new_info.mapped)
+	ShowWindow (GDK_DRAWABLE_XID (window), SW_HIDE);
+      
+      tmp_list = private->children;
+      while (tmp_list)
+	{
+	  gdk_window_premove (tmp_list->data, &parent_pos);
+	  tmp_list = tmp_list->next;
+	}
+
+      if (is_resize)
+	{
+	  if (!MoveWindow (GDK_DRAWABLE_XID (window),
+			   new_info.x, new_info.y, new_info.width, new_info.height,
+			   FALSE))
+	    WIN32_API_FAILED ("MoveWindow");
+	}
+      else
+	{
+	  GetClientRect (GDK_DRAWABLE_XID (window), &rect);
+	  if (!MoveWindow (GDK_DRAWABLE_XID (window),
+			   new_info.x, new_info.y,
+			   rect.right - rect.left, rect.bottom - rect.top,
+			   FALSE))
+	    WIN32_API_FAILED ("MoveWindow");
+	}
+
+      tmp_list = private->children;
+      while (tmp_list)
+	{
+	  gdk_window_postmove (tmp_list->data, &parent_pos);
+	  tmp_list = tmp_list->next;
+	}
+
+      if (data->position_info.no_bg)
+	gdk_window_tmp_reset_bg (window);
+
+      if (!data->position_info.mapped && new_info.mapped && private->mapped)
+	ShowWindow (GDK_DRAWABLE_XID (window), SW_SHOWNA);
+
+      data->position_info = new_info;
+    }
+}
+
+static void
+gdk_window_compute_position (GdkWindow            *window,
+			     GdkWindowParentPos   *parent_pos,
+			     GdkWin32PositionInfo *info)
+{
+  GdkWindowPrivate *private = (GdkWindowPrivate *)window;
+  int parent_x_offset;
+  int parent_y_offset;
+  
+  info->big = FALSE;
+  
+  if (private->drawable.width <= 32768)
+    {
+      info->width = private->drawable.width;
+      info->x = parent_pos->x + private->x - parent_pos->win32_x;
+    }
+  else
+    {
+      info->big = TRUE;
+      info->width = 32768;
+      if (parent_pos->x + private->x < -16384)
+	{
+	  if (parent_pos->x + private->x + private->drawable.width < 16384)
+	    info->x = parent_pos->x + private->x + private->drawable.width - 32768 - parent_pos->win32_x;
+	  else
+	    info->x = -16384 - parent_pos->win32_y;
+	}
+      else
+	info->x = parent_pos->x + private->x - parent_pos->win32_x;
+    }
+
+  if (private->drawable.height <= 32768)
+    {
+      info->height = private->drawable.height;
+      info->y = parent_pos->y + private->y - parent_pos->win32_y;
+    }
+  else
+    {
+      info->big = TRUE;
+      info->height = 32768;
+      if (parent_pos->y + private->y < -16384)
+	{
+	  if (parent_pos->y + private->y + private->drawable.height < 16384)
+	    info->y = parent_pos->y + private->y + private->drawable.height - 32768 - parent_pos->win32_y;
+	  else
+	    info->y = -16384 - parent_pos->win32_y;
+	}
+      else
+	info->y = parent_pos->y + private->y - parent_pos->win32_y;
+    }
+
+  parent_x_offset = parent_pos->win32_x - parent_pos->x;
+  parent_y_offset = parent_pos->win32_y - parent_pos->y;
+  
+  info->x_offset = parent_x_offset + info->x - private->x;
+  info->y_offset = parent_y_offset + info->y - private->y;
+
+  /* We don't considering the clipping of toplevel windows and their immediate children
+   * by their parents, and simply always map those windows.
+   */
+  if (parent_pos->clip_rect.width == G_MAXINT)
+    info->mapped = TRUE;
+  /* Check if the window would wrap around into the visible space in either direction */
+  else if (info->x + parent_x_offset < parent_pos->clip_rect.x + parent_pos->clip_rect.width - 65536 ||
+      info->x + info->width + parent_x_offset > parent_pos->clip_rect.x + 65536 ||
+      info->y + parent_y_offset < parent_pos->clip_rect.y + parent_pos->clip_rect.height - 65536 ||
+      info->y + info->width + parent_y_offset  > parent_pos->clip_rect.y + 65536)
+    info->mapped = FALSE;
+  else
+    info->mapped = TRUE;
+
+  info->no_bg = FALSE;
+
+  if (GDK_DRAWABLE_TYPE (private) == GDK_WINDOW_CHILD)
+    {
+      info->clip_rect.x = private->x;
+      info->clip_rect.y = private->y;
+      info->clip_rect.width = private->drawable.width;
+      info->clip_rect.height = private->drawable.height;
+      
+      gdk_rectangle_intersect (&info->clip_rect, &parent_pos->clip_rect, &info->clip_rect);
+
+      info->clip_rect.x -= private->x;
+      info->clip_rect.y -= private->y;
+    }
+  else
+    {
+      info->clip_rect.x = 0;
+      info->clip_rect.y = 0;
+      info->clip_rect.width = G_MAXINT;
+      info->clip_rect.height = G_MAXINT;
+    }
+}
+
+static void
+gdk_window_compute_parent_pos (GdkWindow          *window,
+			       GdkWindowParentPos *parent_pos)
+{
+  GdkWindowPrivate *private = (GdkWindowPrivate *)window;
+  GdkWindowWin32Data *data;
+  GdkRectangle tmp_clip;
+  
+  int clip_xoffset = 0;
+  int clip_yoffset = 0;
+
+  parent_pos->x = 0;
+  parent_pos->y = 0;
+  parent_pos->win32_x = 0;
+  parent_pos->win32_y = 0;
+
+  /* We take a simple approach here and simply consider toplevel
+   * windows not to clip their children on the right/bottom, since the
+   * size of toplevel windows is not directly under our
+   * control. Clipping only really matters when scrolling and
+   * generally we aren't going to be moving the immediate child of a
+   * toplevel beyond the bounds of that toplevel.
+   *
+   * We could go ahead and recompute the clips of toplevel windows and
+   * their descendents when we receive size notification, but it would
+   * probably not be an improvement in most cases.
+   */
+  parent_pos->clip_rect.x = 0;
+  parent_pos->clip_rect.y = 0;
+  parent_pos->clip_rect.width = G_MAXINT;
+  parent_pos->clip_rect.height = G_MAXINT;
+
+  private = (GdkWindowPrivate *)private->parent;
+  while (private && private->drawable.window_type == GDK_WINDOW_CHILD)
+    {
+      data = (GdkWindowWin32Data *)private->drawable.klass_data;
+
+      tmp_clip.x = - clip_xoffset;
+      tmp_clip.y = - clip_yoffset;
+      tmp_clip.width = private->drawable.width;
+      tmp_clip.height = private->drawable.height;
+
+      gdk_rectangle_intersect (&parent_pos->clip_rect, &tmp_clip, &parent_pos->clip_rect);
+
+      parent_pos->x += private->x;
+      parent_pos->y += private->y;
+      parent_pos->win32_x += data->position_info.x;
+      parent_pos->win32_y += data->position_info.y;
+
+      clip_xoffset += private->x;
+      clip_yoffset += private->y;
+
+      private = (GdkWindowPrivate *)private->parent;
+    }
+}
+
+static void
+gdk_window_premove (GdkWindow          *window,
+		    GdkWindowParentPos *parent_pos)
+{
+  GdkWindowPrivate *private = (GdkWindowPrivate *)window;
+  GdkWindowWin32Data *data = GDK_WINDOW_WIN32DATA (window);
+  GdkWin32PositionInfo new_info;
+  GList *tmp_list;
+  gint d_xoffset, d_yoffset;
+  GdkWindowParentPos this_pos;
+  
+  gdk_window_compute_position (window, parent_pos, &new_info);
+
+  gdk_window_clip_changed (window, &data->position_info.clip_rect, &new_info.clip_rect);
+
+  this_pos.x = parent_pos->x + private->x;
+  this_pos.y = parent_pos->y + private->y;
+  this_pos.win32_x = parent_pos->win32_x + new_info.x;
+  this_pos.win32_y = parent_pos->win32_y + new_info.y;
+  this_pos.clip_rect = new_info.clip_rect;
+
+  if (data->position_info.mapped && !new_info.mapped)
+    ShowWindow (GDK_DRAWABLE_XID (window), SW_HIDE);
+
+  d_xoffset = new_info.x_offset - data->position_info.x_offset;
+  d_yoffset = new_info.y_offset - data->position_info.y_offset;
+  
+  if (d_xoffset != 0 || d_yoffset != 0)
+    {
+      gint new_x0, new_y0, new_x1, new_y1;
+
+      if (d_xoffset < 0 || d_yoffset < 0)
+	gdk_window_queue_translation (window, MIN (d_xoffset, 0), MIN (d_yoffset, 0));
+	
+      if (d_xoffset < 0)
+	{
+	  new_x0 = data->position_info.x + d_xoffset;
+	  new_x1 = data->position_info.x + data->position_info.width;
+	}
+      else
+	{
+	  new_x0 = data->position_info.x;
+	  new_x1 = data->position_info.x + new_info.width + d_xoffset;
+	}
+
+      if (d_yoffset < 0)
+	{
+	  new_y0 = data->position_info.y + d_yoffset;
+	  new_y1 = data->position_info.y + data->position_info.height;
+	}
+      else
+	{
+	  new_y0 = data->position_info.y;
+	  new_y1 = data->position_info.y + new_info.height + d_yoffset;
+	}
+
+      if (!MoveWindow (GDK_DRAWABLE_XID (window),
+		       new_x0, new_y0, new_x1 - new_x0, new_y1 - new_y0,
+		       FALSE))
+	WIN32_API_FAILED ("MoveWindow");
+    }
+
+  tmp_list = private->children;
+  while (tmp_list)
+    {
+      gdk_window_premove (tmp_list->data, &this_pos);
+      tmp_list = tmp_list->next;
+    }
+}
+
+static void
+gdk_window_postmove (GdkWindow          *window,
+		     GdkWindowParentPos *parent_pos)
+{
+  GdkWindowPrivate *private = (GdkWindowPrivate *)window;
+  GdkWindowWin32Data *data = (GdkWindowWin32Data *)private->drawable.klass_data;
+  GdkWin32PositionInfo new_info;
+  GList *tmp_list;
+  gint d_xoffset, d_yoffset;
+  GdkWindowParentPos this_pos;
+  
+  gdk_window_compute_position (window, parent_pos, &new_info);
+
+  this_pos.x = parent_pos->x + private->x;
+  this_pos.y = parent_pos->y + private->y;
+  this_pos.win32_x = parent_pos->win32_x + new_info.x;
+  this_pos.win32_y = parent_pos->win32_y + new_info.y;
+  this_pos.clip_rect = new_info.clip_rect;
+
+  d_xoffset = new_info.x_offset - data->position_info.x_offset;
+  d_yoffset = new_info.y_offset - data->position_info.y_offset;
+  
+  if (d_xoffset != 0 || d_yoffset != 0)
+    {
+      if (d_xoffset > 0 || d_yoffset > 0)
+	gdk_window_queue_translation (window, MAX (d_xoffset, 0), MAX (d_yoffset, 0));
+	
+      if (!MoveWindow (GDK_DRAWABLE_XID (window),
+		       new_info.x, new_info.y, new_info.width, new_info.height,
+		       FALSE))
+	WIN32_API_FAILED ("MoveWindow");
+    }
+
+  if (!data->position_info.mapped && new_info.mapped && private->mapped)
+    ShowWindow (GDK_DRAWABLE_XID (window), SW_SHOWNA);
+
+  if (data->position_info.no_bg)
+    gdk_window_tmp_reset_bg (window);
+
+  data->position_info = new_info;
+
+  tmp_list = private->children;
+  while (tmp_list)
+    {
+      gdk_window_postmove (tmp_list->data, &this_pos);
+      tmp_list = tmp_list->next;
+    }
+}
+
+static void
+gdk_window_queue_translation (GdkWindow *window,
+			      gint       dx,
+			      gint       dy)
+{
+  GdkWindowQueueItem *item = g_new (GdkWindowQueueItem, 1);
+  item->window = window;
+  item->serial = GetMessageTime ();
+  item->type = GDK_WINDOW_QUEUE_TRANSLATE;
+  item->u.translate.dx = dx;
+  item->u.translate.dy = dy;
+
+  GDK_NOTE (EVENTS, g_print ("gdk_window_queue_translation %#x %d %d,%d\n",
+			     GDK_DRAWABLE_XID (window),
+			     item->serial,
+			     dx, dy));
+
+  gdk_drawable_ref (window);
+  translate_queue = g_slist_append (translate_queue, item);
+}
+
+gboolean
+_gdk_windowing_window_queue_antiexpose (GdkWindow *window,
+					GdkRegion *area)
+{
+  GdkWindowQueueItem *item = g_new (GdkWindowQueueItem, 1);
+
+  item->window = window;
+  item->serial = GetMessageTime ();
+  item->type = GDK_WINDOW_QUEUE_ANTIEXPOSE;
+  item->u.antiexpose.area = area;
+
+  GDK_NOTE (EVENTS, g_print ("_gdk_windowing_window_queue_antiexpose %#x %d %dx%d@+%d+%d\n",
+			     GDK_DRAWABLE_XID (window),
+			     item->serial,
+			     area->extents.x2 - area->extents.x1,
+			     area->extents.y2 - area->extents.y1,
+			     area->extents.x1, area->extents.y1));
+
+  gdk_drawable_ref (window);
+  translate_queue = g_slist_append (translate_queue, item);
+
+  return TRUE;
+}
+
+void
+_gdk_window_process_expose (GdkWindow    *window,
+			    gulong        serial,
+			    GdkRectangle *area)
+{
+  GdkWindowWin32Data *data = GDK_WINDOW_WIN32DATA (window);
+  GdkRegion *invalidate_region = gdk_region_rectangle (area);
+  GdkRegion *clip_region;
+
+  GSList *tmp_list = translate_queue;
+
+  GDK_NOTE (EVENTS, g_print ("_gdk_window_process_expose %#x %d %dx%d@+%d+%d\n",
+			     GDK_DRAWABLE_XID (window), serial,
+			     area->width, area->height, area->x, area->y));
+
+  while (tmp_list)
+    {
+      GdkWindowQueueItem *item = tmp_list->data;
+      tmp_list = tmp_list->next;
+
+      if (serial < item->serial)
+	{
+	  if (item->window == window)
+	    {
+	      if (item->type == GDK_WINDOW_QUEUE_TRANSLATE)
+		gdk_region_offset (invalidate_region, - item->u.translate.dx, - item->u.translate.dy);
+	      else		/* anti-expose */
+		gdk_region_subtract (invalidate_region, item->u.antiexpose.area);
+	    }
+	}
+      else
+	{
+	  GSList *tmp_link = translate_queue;
+	  
+	  translate_queue = g_slist_remove_link (translate_queue, translate_queue);
+	  gdk_drawable_unref (item->window);
+
+	  if (item->type == GDK_WINDOW_QUEUE_ANTIEXPOSE)
+	    gdk_region_destroy (item->u.antiexpose.area);
+	  
+	  g_free (item);
+	  g_slist_free_1 (tmp_link);
+	}
+    }
+
+  clip_region = gdk_region_rectangle (&data->position_info.clip_rect);
+  gdk_region_intersect (invalidate_region, clip_region);
+
+  if (!gdk_region_empty (invalidate_region))
+    gdk_window_invalidate_region (window, invalidate_region, FALSE);
+
+  gdk_region_destroy (invalidate_region);
+  gdk_region_destroy (clip_region);
+}
+
+static void
+gdk_window_tmp_unset_bg (GdkWindow *window)
+{
+  /* ??? */
+}
+
+static void
+gdk_window_tmp_reset_bg (GdkWindow *window)
+{
+  /* ??? */
+}
+
+static void
+gdk_window_clip_changed (GdkWindow *window, GdkRectangle *old_clip, GdkRectangle *new_clip)
+{
+  GdkWindowPrivate *private = (GdkWindowPrivate *)window;
+
+  GdkRegion *old_clip_region;
+  GdkRegion *new_clip_region;
+
+  if (private->input_only)
+    return;
+    
+  old_clip_region = gdk_region_rectangle (old_clip);
+  new_clip_region = gdk_region_rectangle (new_clip);
+
+  /* Trim invalid region of window to new clip rectangle
+   */
+  if (private->update_area)
+    gdk_region_intersect (private->update_area, new_clip_region);
+
+  /* Invalidate newly exposed portion of window
+   */
+  gdk_region_subtract (new_clip_region, old_clip_region);
+  if (!gdk_region_empty (new_clip_region))
+    {
+      gdk_window_tmp_unset_bg (window);
+      gdk_window_invalidate_region (window, new_clip_region, FALSE);
+    }
+
+  gdk_region_destroy (new_clip_region);
+  gdk_region_destroy (old_clip_region);
+}
+