frames.c

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/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */

/* Metacity window frame manager widget */

/* 
 * Copyright (C) 2001 Havoc Pennington
 * Copyright (C) 2003 Red Hat, Inc.
 * Copyright (C) 2005, 2006 Elijah Newren
 * 
 * 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 2 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 * 02111-1307, USA.
 */

#include <config.h>
#include <math.h>
#include "boxes.h"
#include "frames.h"
#include "util.h"
#include "core.h"
#include "menu.h"
#include "fixedtip.h"
#include "theme.h"
#include "prefs.h"
#include "ui.h"

#ifdef HAVE_SHAPE
#include <X11/extensions/shape.h>
#endif

#define DEFAULT_INNER_BUTTON_BORDER 3

static void meta_frames_class_init (MetaFramesClass *klass);
static void meta_frames_init       (MetaFrames      *frames);
static void meta_frames_destroy    (GtkObject       *object);
static void meta_frames_finalize   (GObject         *object);
static void meta_frames_style_set  (GtkWidget       *widget,
                                    GtkStyle        *prev_style);
static void meta_frames_realize    (GtkWidget       *widget);
static void meta_frames_unrealize  (GtkWidget       *widget);

static void meta_frames_update_prelit_control (MetaFrames      *frames,
                                               MetaUIFrame     *frame,
                                               MetaFrameControl control);
static gboolean meta_frames_button_press_event    (GtkWidget           *widget,
                                                   GdkEventButton      *event);
static gboolean meta_frames_button_release_event  (GtkWidget           *widget,
                                                   GdkEventButton      *event);
static gboolean meta_frames_motion_notify_event   (GtkWidget           *widget,
                                                   GdkEventMotion      *event);
static gboolean meta_frames_destroy_event         (GtkWidget           *widget,
                                                   GdkEventAny         *event);
static gboolean meta_frames_expose_event          (GtkWidget           *widget,
                                                   GdkEventExpose      *event);
static gboolean meta_frames_enter_notify_event    (GtkWidget           *widget,
                                                   GdkEventCrossing    *event);
static gboolean meta_frames_leave_notify_event    (GtkWidget           *widget,
                                                   GdkEventCrossing    *event);

static void meta_frames_paint_to_drawable (MetaFrames   *frames,
                                           MetaUIFrame  *frame,
                                           GdkDrawable  *drawable,
                                           GdkRegion    *region,
                                           int           x_offset,
                                           int           y_offset);

static void meta_frames_set_window_background (MetaFrames   *frames,
                                               MetaUIFrame  *frame);

static void meta_frames_calc_geometry (MetaFrames        *frames,
                                       MetaUIFrame         *frame,
                                       MetaFrameGeometry *fgeom);

static void meta_frames_ensure_layout (MetaFrames      *frames,
                                       MetaUIFrame     *frame);

static MetaUIFrame* meta_frames_lookup_window (MetaFrames *frames,
                                               Window      xwindow);

static void meta_frames_font_changed          (MetaFrames *frames);
static void meta_frames_button_layout_changed (MetaFrames *frames);


static GdkRectangle*    control_rect (MetaFrameControl   control,
                                      MetaFrameGeometry *fgeom);
static MetaFrameControl get_control  (MetaFrames        *frames,
                                      MetaUIFrame       *frame,
                                      int                x,
                                      int                y);
static void clear_tip (MetaFrames *frames);
static void invalidate_all_caches (MetaFrames *frames);
static void invalidate_whole_window (MetaFrames *frames,
                                     MetaUIFrame *frame);

static GtkWidgetClass *parent_class = NULL;

GtkType
meta_frames_get_type (void)
{
  static GtkType frames_type = 0;

  if (!frames_type)
    {
      static const GtkTypeInfo frames_info =
      {
        "MetaFrames",
        sizeof (MetaFrames),
        sizeof (MetaFramesClass),
        (GtkClassInitFunc) meta_frames_class_init,
        (GtkObjectInitFunc) meta_frames_init,
        /* reserved_1 */ NULL,
        /* reserved_2 */ NULL,
        (GtkClassInitFunc) NULL,
      };

      frames_type = gtk_type_unique (GTK_TYPE_WINDOW, &frames_info);
    }

  return frames_type;
}

static void
meta_frames_class_init (MetaFramesClass *class)
{
  GObjectClass   *gobject_class;
  GtkObjectClass *object_class;
  GtkWidgetClass *widget_class;

  gobject_class = G_OBJECT_CLASS (class);
  object_class = (GtkObjectClass*) class;
  widget_class = (GtkWidgetClass*) class;

  parent_class = g_type_class_peek_parent (class);

  gobject_class->finalize = meta_frames_finalize;
  object_class->destroy = meta_frames_destroy;

  widget_class->style_set = meta_frames_style_set;

  widget_class->realize = meta_frames_realize;
  widget_class->unrealize = meta_frames_unrealize;
  
  widget_class->expose_event = meta_frames_expose_event;
  widget_class->destroy_event = meta_frames_destroy_event;  
  widget_class->button_press_event = meta_frames_button_press_event;
  widget_class->button_release_event = meta_frames_button_release_event;
  widget_class->motion_notify_event = meta_frames_motion_notify_event;
  widget_class->enter_notify_event = meta_frames_enter_notify_event;
  widget_class->leave_notify_event = meta_frames_leave_notify_event;
}

static gint
unsigned_long_equal (gconstpointer v1,
                     gconstpointer v2)
{
  return *((const gulong*) v1) == *((const gulong*) v2);
}

static guint
unsigned_long_hash (gconstpointer v)
{
  gulong val = * (const gulong *) v;

  /* I'm not sure this works so well. */
#if GLIB_SIZEOF_LONG > 4
  return (guint) (val ^ (val >> 32));
#else
  return val;
#endif
}

static void
prefs_changed_callback (MetaPreference pref,
                        void          *data)
{
  switch (pref)
    {
    case META_PREF_TITLEBAR_FONT:
      meta_frames_font_changed (META_FRAMES (data));
      break;
    case META_PREF_BUTTON_LAYOUT:
      meta_frames_button_layout_changed (META_FRAMES (data));
      break;
    default:
      break;
    }
}

static void
meta_frames_init (MetaFrames *frames)
{
  GTK_WINDOW (frames)->type = GTK_WINDOW_POPUP;

  frames->text_heights = g_hash_table_new (NULL, NULL);
  
  frames->frames = g_hash_table_new (unsigned_long_hash, unsigned_long_equal);

  frames->tooltip_timeout = 0;

  frames->expose_delay_count = 0;

  frames->invalidate_cache_timeout_id = 0;
  frames->invalidate_frames = NULL;
  frames->cache = g_hash_table_new (g_direct_hash, g_direct_equal);

  gtk_widget_set_double_buffered (GTK_WIDGET (frames), FALSE);

  meta_prefs_add_listener (prefs_changed_callback, frames);
}

static void
listify_func (gpointer key, gpointer value, gpointer data)
{
  GSList **listp;

  listp = data;
  *listp = g_slist_prepend (*listp, value);
}

static void
meta_frames_destroy (GtkObject *object)
{
  GSList *winlist;
  GSList *tmp;
  MetaFrames *frames;
  
  frames = META_FRAMES (object);

  clear_tip (frames);
  
  winlist = NULL;
  g_hash_table_foreach (frames->frames, listify_func, &winlist);

  /* Unmanage all frames */
  for (tmp = winlist; tmp != NULL; tmp = tmp->next)
    {
      MetaUIFrame *frame;

      frame = tmp->data;

      meta_frames_unmanage_window (frames, frame->xwindow);
    }
  g_slist_free (winlist);

  GTK_OBJECT_CLASS (parent_class)->destroy (object);
}

static void
meta_frames_finalize (GObject *object)
{
  MetaFrames *frames;
  
  frames = META_FRAMES (object);

  meta_prefs_remove_listener (prefs_changed_callback, frames);
  
  g_hash_table_destroy (frames->text_heights);

  invalidate_all_caches (frames);
  if (frames->invalidate_cache_timeout_id)
    g_source_remove (frames->invalidate_cache_timeout_id);
  
  g_assert (g_hash_table_size (frames->frames) == 0);
  g_hash_table_destroy (frames->frames);
  g_hash_table_destroy (frames->cache);

  G_OBJECT_CLASS (parent_class)->finalize (object);
}

typedef struct
{
  MetaRectangle rect;
  GdkPixmap *pixmap;
} CachedFramePiece;

typedef struct
{
  /* Caches of the four rendered sides in a MetaFrame.
   * Order: top (titlebar), left, right, bottom.
   */
  CachedFramePiece piece[4];
} CachedPixels;

static CachedPixels *
get_cache (MetaFrames *frames,
           MetaUIFrame *frame)
{
  CachedPixels *pixels;
  
  pixels = g_hash_table_lookup (frames->cache, frame);

  if (!pixels)
    {
      pixels = g_new0 (CachedPixels, 1);
      g_hash_table_insert (frames->cache, frame, pixels);
    }

  return pixels;
}

static void
invalidate_cache (MetaFrames *frames,
                  MetaUIFrame *frame)
{
  CachedPixels *pixels = get_cache (frames, frame);
  int i;
  
  for (i = 0; i < 4; i++)
    if (pixels->piece[i].pixmap)
      g_object_unref (pixels->piece[i].pixmap);
  
  g_free (pixels);
  g_hash_table_remove (frames->cache, frame);
}

static void
invalidate_all_caches (MetaFrames *frames)
{
  GList *l;

  for (l = frames->invalidate_frames; l; l = l->next)
    {
      MetaUIFrame *frame = l->data;

      invalidate_cache (frames, frame);
    }
  
  g_list_free (frames->invalidate_frames);
  frames->invalidate_frames = NULL;
}

static gboolean
invalidate_cache_timeout (gpointer data)
{
  MetaFrames *frames = data;
  
  invalidate_all_caches (frames);
  frames->invalidate_cache_timeout_id = 0;
  return FALSE;
}

static void
queue_recalc_func (gpointer key, gpointer value, gpointer data)
{
  MetaUIFrame *frame;
  MetaFrames *frames;

  frames = META_FRAMES (data);
  frame = value;

  /* If a resize occurs it will cause a redraw, but the
   * resize may not actually be needed so we always redraw
   * in case of color change.
   */
  meta_frames_set_window_background (frames, frame);
  
  invalidate_whole_window (frames, frame);
  meta_core_queue_frame_resize (gdk_display,
                                frame->xwindow);
  if (frame->layout)
    {
      /* save title to recreate layout */
      g_free (frame->title);
      
      frame->title = g_strdup (pango_layout_get_text (frame->layout));

      g_object_unref (G_OBJECT (frame->layout));
      frame->layout = NULL;
    }
}

static void
meta_frames_font_changed (MetaFrames *frames)
{
  if (g_hash_table_size (frames->text_heights) > 0)
    {
      g_hash_table_destroy (frames->text_heights);
      frames->text_heights = g_hash_table_new (NULL, NULL);
    }
  
  /* Queue a draw/resize on all frames */
  g_hash_table_foreach (frames->frames,
                        queue_recalc_func, frames);

}

static void
queue_draw_func (gpointer key, gpointer value, gpointer data)
{
  MetaUIFrame *frame;
  MetaFrames *frames;

  frames = META_FRAMES (data);
  frame = value;

  /* If a resize occurs it will cause a redraw, but the
   * resize may not actually be needed so we always redraw
   * in case of color change.
   */
  meta_frames_set_window_background (frames, frame);

  invalidate_whole_window (frames, frame);
}

static void
meta_frames_button_layout_changed (MetaFrames *frames)
{
  g_hash_table_foreach (frames->frames,
                        queue_draw_func, frames);
}

static void
meta_frames_style_set  (GtkWidget *widget,
                        GtkStyle  *prev_style)
{
  MetaFrames *frames;

  frames = META_FRAMES (widget);

  meta_frames_font_changed (frames);

  GTK_WIDGET_CLASS (parent_class)->style_set (widget, prev_style);
}

static void
meta_frames_ensure_layout (MetaFrames  *frames,
                           MetaUIFrame *frame)
{
  GtkWidget *widget;
  MetaFrameFlags flags;
  MetaFrameType type;
  MetaFrameStyle *style;
  
  g_return_if_fail (GTK_WIDGET_REALIZED (frames));

  widget = GTK_WIDGET (frames);
      
  meta_core_get (gdk_display, frame->xwindow,
                 META_CORE_GET_FRAME_FLAGS, &flags,
                 META_CORE_GET_FRAME_TYPE, &type,
                 META_CORE_GET_END);

  style = meta_theme_get_frame_style (meta_theme_get_current (),
                                      type, flags);

  if (style != frame->cache_style)
    {
      if (frame->layout)
        {
          /* save title to recreate layout */
          g_free (frame->title);
          
          frame->title = g_strdup (pango_layout_get_text (frame->layout));

          g_object_unref (G_OBJECT (frame->layout));
          frame->layout = NULL;
        }
    }

  frame->cache_style = style;
  
  if (frame->layout == NULL)
    {
      gpointer key, value;
      PangoFontDescription *font_desc;
      double scale;
      int size;
      
      scale = meta_theme_get_title_scale (meta_theme_get_current (),
                                          type,
                                          flags);
      
      frame->layout = gtk_widget_create_pango_layout (widget, frame->title);

      pango_layout_set_auto_dir (frame->layout, FALSE);
      
      font_desc = meta_gtk_widget_get_font_desc (widget, scale,
                                                 meta_prefs_get_titlebar_font ());

      size = pango_font_description_get_size (font_desc);

      if (g_hash_table_lookup_extended (frames->text_heights,
                                        GINT_TO_POINTER (size),
                                        &key, &value))
        {
          frame->text_height = GPOINTER_TO_INT (value);
        }
      else
        {
          frame->text_height =
            meta_pango_font_desc_get_text_height (font_desc,
                                                  gtk_widget_get_pango_context (widget));

          g_hash_table_replace (frames->text_heights,
                                GINT_TO_POINTER (size),
                                GINT_TO_POINTER (frame->text_height));
        }
      
      pango_layout_set_font_description (frame->layout, 
                                         font_desc);
      
      pango_font_description_free (font_desc);

      /* Save some RAM */
      g_free (frame->title);
      frame->title = NULL;
    }
}

static void
meta_frames_calc_geometry (MetaFrames        *frames,
                           MetaUIFrame       *frame,
                           MetaFrameGeometry *fgeom)
{
  int width, height;
  MetaFrameFlags flags;
  MetaFrameType type;
  MetaButtonLayout button_layout;
  
  meta_core_get (gdk_display, frame->xwindow,
                 META_CORE_GET_CLIENT_WIDTH, &width,
                 META_CORE_GET_CLIENT_HEIGHT, &height,
                 META_CORE_GET_FRAME_FLAGS, &flags,
                 META_CORE_GET_FRAME_TYPE, &type,
                 META_CORE_GET_END);

  meta_frames_ensure_layout (frames, frame);

  meta_prefs_get_button_layout (&button_layout);
  
  meta_theme_calc_geometry (meta_theme_get_current (),
                            type,
                            frame->text_height,
                            flags,
                            width, height,
                            &button_layout,
                            fgeom);
}

MetaFrames*
meta_frames_new (int screen_number)
{
  GdkScreen *screen;

  screen = gdk_display_get_screen (gdk_display_get_default (),
                                   screen_number);

  return g_object_new (META_TYPE_FRAMES,
                       "screen", screen,
                       NULL);  
}

void
meta_frames_manage_window (MetaFrames *frames,
                           Window      xwindow,
                           GdkWindow  *window)
{
  MetaUIFrame *frame;

  g_assert (window);

  frame = g_new (MetaUIFrame, 1);
  
  frame->window = window;

  gdk_window_set_user_data (frame->window, frames);

  /* Don't set event mask here, it's in frame.c */
  
  frame->xwindow = xwindow;
  frame->cache_style = NULL;
  frame->layout = NULL;
  frame->text_height = -1;
  frame->title = NULL;
  frame->expose_delayed = FALSE;
  frame->shape_applied = FALSE;
  frame->prelit_control = META_FRAME_CONTROL_NONE;

  /* Don't set the window background yet; we need frame->xwindow to be
   * registered with its MetaWindow, which happens after this function
   * and meta_ui_create_frame_window() return to meta_window_ensure_frame().
   */
  
  meta_core_grab_buttons (gdk_display, frame->xwindow);
  
  g_hash_table_replace (frames->frames, &frame->xwindow, frame);
}

void
meta_frames_unmanage_window (MetaFrames *frames,
                             Window      xwindow)
{
  MetaUIFrame *frame;

  clear_tip (frames);
  
  frame = g_hash_table_lookup (frames->frames, &xwindow);

  if (frame)
    {
      /* invalidating all caches ensures the frame
       * is not actually referenced anymore
       */
      invalidate_all_caches (frames);
      
      /* restore the cursor */
      meta_core_set_screen_cursor (gdk_display,
                                   frame->xwindow,
                                   META_CURSOR_DEFAULT);

      gdk_window_set_user_data (frame->window, NULL);

      if (frames->last_motion_frame == frame)
        frames->last_motion_frame = NULL;
      
      g_hash_table_remove (frames->frames, &frame->xwindow);

      gdk_window_destroy (frame->window);

      if (frame->layout)
        g_object_unref (G_OBJECT (frame->layout));

      if (frame->title)
        g_free (frame->title);
      
      g_free (frame);
    }
  else
    meta_warning ("Frame 0x%lx not managed, can't unmanage\n", xwindow);
}

static void
meta_frames_realize (GtkWidget *widget)
{
  if (GTK_WIDGET_CLASS (parent_class)->realize)
    GTK_WIDGET_CLASS (parent_class)->realize (widget);
}

static void
meta_frames_unrealize (GtkWidget *widget)
{
  if (GTK_WIDGET_CLASS (parent_class)->unrealize)
    GTK_WIDGET_CLASS (parent_class)->unrealize (widget);
}

static MetaUIFrame*
meta_frames_lookup_window (MetaFrames *frames,
                           Window      xwindow)
{
  MetaUIFrame *frame;

  frame = g_hash_table_lookup (frames->frames, &xwindow);

  return frame;
}

void
meta_frames_get_geometry (MetaFrames *frames,
                          Window xwindow,
                          int *top_height, int *bottom_height,
                          int *left_width, int *right_width)
{
  MetaFrameFlags flags;
  MetaUIFrame *frame;
  MetaFrameType type;
  
  frame = meta_frames_lookup_window (frames, xwindow);

  if (frame == NULL)
    meta_bug ("No such frame 0x%lx\n", xwindow);
  
  meta_core_get (gdk_display, frame->xwindow,
                 META_CORE_GET_FRAME_FLAGS, &flags,
                 META_CORE_GET_FRAME_TYPE, &type,
                 META_CORE_GET_END);

  g_return_if_fail (type < META_FRAME_TYPE_LAST);

  meta_frames_ensure_layout (frames, frame);
  
  /* We can't get the full geometry, because that depends on
   * the client window size and probably we're being called
   * by the core move/resize code to decide on the client
   * window size
   */
  meta_theme_get_frame_borders (meta_theme_get_current (),
                                type,
                                frame->text_height,
                                flags,
                                top_height, bottom_height,
                                left_width, right_width);
}

void
meta_frames_reset_bg (MetaFrames *frames,
                      Window  xwindow)
{
  MetaUIFrame *frame;
  
  frame = meta_frames_lookup_window (frames, xwindow);

  meta_frames_set_window_background (frames, frame);
}

static void
set_background_none (Display *xdisplay,
                     Window   xwindow)
{
  XSetWindowAttributes attrs;

  attrs.background_pixmap = None;
  XChangeWindowAttributes (xdisplay, xwindow,
                           CWBackPixmap, &attrs);
}

void
meta_frames_unflicker_bg (MetaFrames *frames,
                          Window      xwindow,
                          int         target_width,
                          int         target_height)
{
  MetaUIFrame *frame;
  
  frame = meta_frames_lookup_window (frames, xwindow);
  g_return_if_fail (frame != NULL);

#if 0
  pixmap = gdk_pixmap_new (frame->window,
                           width, height,
                           -1);

  /* Oops, no way to get the background here */
  
  meta_frames_paint_to_drawable (frames, frame, pixmap);
#endif

  set_background_none (gdk_display, frame->xwindow);
}

void
meta_frames_apply_shapes (MetaFrames *frames,
                          Window      xwindow,
                          int         new_window_width,
                          int         new_window_height,
                          gboolean    window_has_shape)
{
#ifdef HAVE_SHAPE
  /* Apply shapes as if window had new_window_width, new_window_height */
  MetaUIFrame *frame;
  MetaFrameGeometry fgeom;
  XRectangle xrect;
  Region corners_xregion;
  Region window_xregion;
  
  frame = meta_frames_lookup_window (frames, xwindow);
  g_return_if_fail (frame != NULL);

  meta_frames_calc_geometry (frames, frame, &fgeom);

  if (!(fgeom.top_left_corner_rounded_radius != 0 ||
        fgeom.top_right_corner_rounded_radius != 0 ||
        fgeom.bottom_left_corner_rounded_radius != 0 ||
        fgeom.bottom_right_corner_rounded_radius != 0 ||
        window_has_shape))
    {
      if (frame->shape_applied)
        {
          meta_topic (META_DEBUG_SHAPES,
                      "Unsetting shape mask on frame 0x%lx\n",
                      frame->xwindow);
          
          XShapeCombineMask (gdk_display, frame->xwindow,
                             ShapeBounding, 0, 0, None, ShapeSet);
          frame->shape_applied = FALSE;
        }
      else
        {
          meta_topic (META_DEBUG_SHAPES,
                      "Frame 0x%lx still doesn't need a shape mask\n",
                      frame->xwindow);
        }
      
      return; /* nothing to do */
    }
  
  corners_xregion = XCreateRegion ();
  
  if (fgeom.top_left_corner_rounded_radius != 0)
    {
      const int corner = fgeom.top_left_corner_rounded_radius;
      const float radius = sqrt(corner) + corner;
      int i;

      for (i=0; i<corner; i++)
        {
          const int width = floor(0.5 + radius - sqrt(radius*radius - (radius-(i+0.5))*(radius-(i+0.5))));
          xrect.x = 0;
          xrect.y = i;
          xrect.width = width;
          xrect.height = 1;
          
          XUnionRectWithRegion (&xrect, corners_xregion, corners_xregion);
        }
    }

  if (fgeom.top_right_corner_rounded_radius != 0)
    {
      const int corner = fgeom.top_right_corner_rounded_radius;
      const float radius = sqrt(corner) + corner;
      int i;

      for (i=0; i<corner; i++)
        {
          const int width = floor(0.5 + radius - sqrt(radius*radius - (radius-(i+0.5))*(radius-(i+0.5))));
          xrect.x = new_window_width - width;
          xrect.y = i;
          xrect.width = width;
          xrect.height = 1;
          
          XUnionRectWithRegion (&xrect, corners_xregion, corners_xregion);
        }
    }

  if (fgeom.bottom_left_corner_rounded_radius != 0)
    {
      const int corner = fgeom.bottom_left_corner_rounded_radius;
      const float radius = sqrt(corner) + corner;
      int i;

      for (i=0; i<corner; i++)
        {
          const int width = floor(0.5 + radius - sqrt(radius*radius - (radius-(i+0.5))*(radius-(i+0.5))));
          xrect.x = 0;
          xrect.y = new_window_height - i - 1;
          xrect.width = width;
          xrect.height = 1;
          
          XUnionRectWithRegion (&xrect, corners_xregion, corners_xregion);
        }
    }

  if (fgeom.bottom_right_corner_rounded_radius != 0)
    {
      const int corner = fgeom.bottom_right_corner_rounded_radius;
      const float radius = sqrt(corner) + corner;
      int i;

      for (i=0; i<corner; i++)
        {
          const int width = floor(0.5 + radius - sqrt(radius*radius - (radius-(i+0.5))*(radius-(i+0.5))));
          xrect.x = new_window_width - width;
          xrect.y = new_window_height - i - 1;
          xrect.width = width;
          xrect.height = 1;
          
          XUnionRectWithRegion (&xrect, corners_xregion, corners_xregion);
        }
    }
  
  window_xregion = XCreateRegion ();
  
  xrect.x = 0;
  xrect.y = 0;
  xrect.width = new_window_width;
  xrect.height = new_window_height;

  XUnionRectWithRegion (&xrect, window_xregion, window_xregion);

  XSubtractRegion (window_xregion, corners_xregion, window_xregion);

  XDestroyRegion (corners_xregion);
  
  if (window_has_shape)
    {
      /* The client window is oclock or something and has a shape
       * mask. To avoid a round trip to get its shape region, we
       * create a fake window that's never mapped, build up our shape
       * on that, then combine. Wasting the window is assumed cheaper
       * than a round trip, but who really knows for sure.
       */
      XSetWindowAttributes attrs;      
      Window shape_window;
      Window client_window;
      Region client_xregion;
      GdkScreen *screen;
      int screen_number;
      
      meta_topic (META_DEBUG_SHAPES,
                  "Frame 0x%lx needs to incorporate client shape\n",
                  frame->xwindow);

      screen = gtk_widget_get_screen (GTK_WIDGET (frames));
      screen_number = gdk_x11_screen_get_screen_number (screen);
      
      attrs.override_redirect = True;
      
      shape_window = XCreateWindow (gdk_display,
                                    RootWindow (gdk_display, screen_number),
                                    -5000, -5000,
                                    new_window_width,
                                    new_window_height,
                                    0,
                                    CopyFromParent,
                                    CopyFromParent,
                                    (Visual *)CopyFromParent,
                                    CWOverrideRedirect,
                                    &attrs);

      /* Copy the client's shape to the temporary shape_window */
      meta_core_get (gdk_display, frame->xwindow,
                     META_CORE_GET_CLIENT_XWINDOW, &client_window,
                     META_CORE_GET_END);

      XShapeCombineShape (gdk_display, shape_window, ShapeBounding,
                          fgeom.left_width,
                          fgeom.top_height,
                          client_window,
                          ShapeBounding,
                          ShapeSet);

      /* Punch the client area out of the normal frame shape,
       * then union it with the shape_window's existing shape
       */
      client_xregion = XCreateRegion ();
  
      xrect.x = fgeom.left_width;
      xrect.y = fgeom.top_height;
      xrect.width = new_window_width - fgeom.right_width - xrect.x;
      xrect.height = new_window_height - fgeom.bottom_height - xrect.y;

      XUnionRectWithRegion (&xrect, client_xregion, client_xregion);
      
      XSubtractRegion (window_xregion, client_xregion, window_xregion);

      XDestroyRegion (client_xregion);
      
      XShapeCombineRegion (gdk_display, shape_window,
                           ShapeBounding, 0, 0, window_xregion, ShapeUnion);
      
      /* Now copy shape_window shape to the real frame */
      XShapeCombineShape (gdk_display, frame->xwindow, ShapeBounding,
                          0, 0,
                          shape_window,
                          ShapeBounding,
                          ShapeSet);

      XDestroyWindow (gdk_display, shape_window);
    }
  else
    {
      /* No shape on the client, so just do simple stuff */

      meta_topic (META_DEBUG_SHAPES,
                  "Frame 0x%lx has shaped corners\n",
                  frame->xwindow);
      
      XShapeCombineRegion (gdk_display, frame->xwindow,
                           ShapeBounding, 0, 0, window_xregion, ShapeSet);
    }
  
  frame->shape_applied = TRUE;
  
  XDestroyRegion (window_xregion);
#endif /* HAVE_SHAPE */
}

void
meta_frames_move_resize_frame (MetaFrames *frames,
                               Window      xwindow,
                               int         x,
                               int         y,
                               int         width,
                               int         height)
{
  MetaUIFrame *frame = meta_frames_lookup_window (frames, xwindow);
  int old_x, old_y, old_width, old_height;
  
  gdk_drawable_get_size (frame->window, &old_width, &old_height);
  gdk_window_get_position (frame->window, &old_x, &old_y);

  gdk_window_move_resize (frame->window, x, y, width, height);

  if (old_width != width || old_height != height)
    invalidate_whole_window (frames, frame);
}

void
meta_frames_queue_draw (MetaFrames *frames,
                        Window      xwindow)
{
  MetaUIFrame *frame;
  
  frame = meta_frames_lookup_window (frames, xwindow);

  invalidate_whole_window (frames, frame);
}

void
meta_frames_set_title (MetaFrames *frames,
                       Window      xwindow,
                       const char *title)
{
  MetaUIFrame *frame;
  
  frame = meta_frames_lookup_window (frames, xwindow);

  g_assert (frame);
  
  g_free (frame->title);
  frame->title = g_strdup (title);
  
  if (frame->layout)
    {
      g_object_unref (frame->layout);
      frame->layout = NULL;
    }

  invalidate_whole_window (frames, frame);
}

void
meta_frames_repaint_frame (MetaFrames *frames,
                           Window      xwindow)
{
  MetaUIFrame *frame;
  
  frame = meta_frames_lookup_window (frames, xwindow);

  g_assert (frame);

  /* repaint everything, so the other frame don't
   * lag behind if they are exposed
   */
  gdk_window_process_all_updates ();
}

static void
show_tip_now (MetaFrames *frames)
{
  const char *tiptext;
  MetaUIFrame *frame;
  int x, y, root_x, root_y;
  Window root, child;
  guint mask;
  MetaFrameControl control;
  
  frame = frames->last_motion_frame;
  if (frame == NULL)
    return;

  XQueryPointer (gdk_display,
                 frame->xwindow,
                 &root, &child,
                 &root_x, &root_y,
                 &x, &y,
                 &mask);
  
  control = get_control (frames, frame, x, y);
  
  tiptext = NULL;
  switch (control)
    {
    case META_FRAME_CONTROL_TITLE:
      break;
    case META_FRAME_CONTROL_DELETE:
      tiptext = _("Close Window");
      break;
    case META_FRAME_CONTROL_MENU:
      tiptext = _("Window Menu");
      break;
    case META_FRAME_CONTROL_MINIMIZE:
      tiptext = _("Minimize Window");
      break;
    case META_FRAME_CONTROL_MAXIMIZE:
      tiptext = _("Maximize Window");
      break;
    case META_FRAME_CONTROL_UNMAXIMIZE:
      tiptext = _("Unmaximize Window");
      break;
    case META_FRAME_CONTROL_SHADE:
      tiptext = _("Roll Up Window");
      break;
    case META_FRAME_CONTROL_UNSHADE:
      tiptext = _("Unroll Window");
      break;
    case META_FRAME_CONTROL_ABOVE:
      tiptext = _("Keep Window On Top");
      break;
    case META_FRAME_CONTROL_UNABOVE:
      tiptext = _("Remove Window From Top");
      break;
    case META_FRAME_CONTROL_STICK:
      tiptext = _("Always On Visible Workspace");
      break;
    case META_FRAME_CONTROL_UNSTICK:
      tiptext = _("Put Window On Only One Workspace");
      break;
    case META_FRAME_CONTROL_RESIZE_SE:
      break;
    case META_FRAME_CONTROL_RESIZE_S:
      break;
    case META_FRAME_CONTROL_RESIZE_SW:
      break;
    case META_FRAME_CONTROL_RESIZE_N:
      break;
    case META_FRAME_CONTROL_RESIZE_NE:
      break;
    case META_FRAME_CONTROL_RESIZE_NW:
      break;
    case META_FRAME_CONTROL_RESIZE_W:
      break;
    case META_FRAME_CONTROL_RESIZE_E:
      break;
    case META_FRAME_CONTROL_NONE:      
      break;
    case META_FRAME_CONTROL_CLIENT_AREA:
      break;
    }

  if (tiptext)
    {
      MetaFrameGeometry fgeom;
      GdkRectangle *rect;
      int dx, dy;
      int screen_number;
      
      meta_frames_calc_geometry (frames, frame, &fgeom);
      
      rect = control_rect (control, &fgeom);

      /* get conversion delta for root-to-frame coords */
      dx = root_x - x;
      dy = root_y - y;

      /* Align the tooltip to the button right end if RTL */
      if (meta_ui_get_direction() == META_UI_DIRECTION_RTL)
        dx += rect->width;

      screen_number = gdk_screen_get_number (gtk_widget_get_screen (GTK_WIDGET (frames)));
      
      meta_fixed_tip_show (gdk_display,
                           screen_number,
                           rect->x + dx,
                           rect->y + rect->height + 2 + dy,
                           tiptext);
    }
}

static gboolean
tip_timeout_func (gpointer data)
{
  MetaFrames *frames;

  frames = data;

  show_tip_now (frames);

  return FALSE;
}

#define TIP_DELAY 450
static void
queue_tip (MetaFrames *frames)
{
  clear_tip (frames);
  
  frames->tooltip_timeout = g_timeout_add (TIP_DELAY,
                                           tip_timeout_func,
                                           frames);  
}

static void
clear_tip (MetaFrames *frames)
{
  if (frames->tooltip_timeout)
    {
      g_source_remove (frames->tooltip_timeout);
      frames->tooltip_timeout = 0;
    }
  meta_fixed_tip_hide ();
}

static void
redraw_control (MetaFrames *frames,
                MetaUIFrame *frame,
                MetaFrameControl control)
{
  MetaFrameGeometry fgeom;
  GdkRectangle *rect;
  
  meta_frames_calc_geometry (frames, frame, &fgeom);

  rect = control_rect (control, &fgeom);

  gdk_window_invalidate_rect (frame->window, rect, FALSE);
  invalidate_cache (frames, frame);
}

static gboolean
meta_frame_titlebar_event (MetaUIFrame    *frame,
                           GdkEventButton *event,
                           int            action)
{
  MetaFrameFlags flags;
  
  switch (action)
    {
    case META_ACTION_TITLEBAR_TOGGLE_SHADE:
      {
        meta_core_get (gdk_display, frame->xwindow,
                       META_CORE_GET_FRAME_FLAGS, &flags,
                       META_CORE_GET_END);
        
        if (flags & META_FRAME_ALLOWS_SHADE)
          {
            if (flags & META_FRAME_SHADED)
              meta_core_unshade (gdk_display,
                                 frame->xwindow,
                                 event->time);
            else
              meta_core_shade (gdk_display,
                               frame->xwindow,
                               event->time);
          }
      }
      break;          
      
    case META_ACTION_TITLEBAR_TOGGLE_MAXIMIZE:
      {
        meta_core_get (gdk_display, frame->xwindow,
                       META_CORE_GET_FRAME_FLAGS, &flags,
                       META_CORE_GET_END);
        
        if (flags & META_FRAME_ALLOWS_MAXIMIZE)
          {
            meta_core_toggle_maximize (gdk_display, frame->xwindow);
          }
      }
      break;

    case META_ACTION_TITLEBAR_TOGGLE_MAXIMIZE_HORIZONTALLY:
      {
        meta_core_get (gdk_display, frame->xwindow,
                       META_CORE_GET_FRAME_FLAGS, &flags,
                       META_CORE_GET_END);
        
        if (flags & META_FRAME_ALLOWS_MAXIMIZE)
          {
            meta_core_toggle_maximize_horizontally (gdk_display, frame->xwindow);
          }
      }
      break;

    case META_ACTION_TITLEBAR_TOGGLE_MAXIMIZE_VERTICALLY:
      {
        meta_core_get (gdk_display, frame->xwindow,
                       META_CORE_GET_FRAME_FLAGS, &flags,
                       META_CORE_GET_END);
        
        if (flags & META_FRAME_ALLOWS_MAXIMIZE)
          {
            meta_core_toggle_maximize_vertically (gdk_display, frame->xwindow);
          }
      }
      break;

    case META_ACTION_TITLEBAR_MINIMIZE:
      {
        meta_core_get (gdk_display, frame->xwindow,
                       META_CORE_GET_FRAME_FLAGS, &flags,
                       META_CORE_GET_END);
        
        if (flags & META_FRAME_ALLOWS_MINIMIZE)
          {
            meta_core_minimize (gdk_display, frame->xwindow);
          }
      }
      break;

    case META_ACTION_TITLEBAR_NONE:
      /* Yaay, a sane user that doesn't use that other weird crap! */
      break;
    
    case META_ACTION_TITLEBAR_LOWER:
      meta_core_user_lower_and_unfocus (gdk_display,
                                        frame->xwindow,
                                        event->time);
      break;

    case META_ACTION_TITLEBAR_MENU:
      meta_core_show_window_menu (gdk_display,
                                  frame->xwindow,
                                  event->x_root,
                                  event->y_root,
                                  event->button,
                                  event->time);
      break;

    case META_ACTION_TITLEBAR_LAST:
      break;
    }
  
  return TRUE;
}

static gboolean
meta_frame_double_click_event (MetaUIFrame    *frame,
                               GdkEventButton *event)
{
  int action = meta_prefs_get_action_double_click_titlebar ();
  
  return meta_frame_titlebar_event (frame, event, action);
}

static gboolean
meta_frame_middle_click_event (MetaUIFrame    *frame,
                               GdkEventButton *event)
{
  int action = meta_prefs_get_action_middle_click_titlebar();
  
  return meta_frame_titlebar_event (frame, event, action);
}

static gboolean
meta_frame_right_click_event(MetaUIFrame     *frame,
                             GdkEventButton  *event)
{
  int action = meta_prefs_get_action_right_click_titlebar();
  
  return meta_frame_titlebar_event (frame, event, action);
}

static gboolean
meta_frames_button_press_event (GtkWidget      *widget,
                                GdkEventButton *event)
{
  MetaUIFrame *frame;
  MetaFrames *frames;
  MetaFrameControl control;
  
  frames = META_FRAMES (widget);

  /* Remember that the display may have already done something with this event.
   * If so there's probably a GrabOp in effect.
   */
  
  frame = meta_frames_lookup_window (frames, GDK_WINDOW_XID (event->window));
  if (frame == NULL)
    return FALSE;

  clear_tip (frames);
  
  control = get_control (frames, frame, event->x, event->y);

  /* focus on click, even if click was on client area */
  if (event->button == 1 &&
      !(control == META_FRAME_CONTROL_MINIMIZE ||
        control == META_FRAME_CONTROL_DELETE ||
        control == META_FRAME_CONTROL_MAXIMIZE))
    {
      meta_topic (META_DEBUG_FOCUS,
                  "Focusing window with frame 0x%lx due to button 1 press\n",
                  frame->xwindow);
      meta_core_user_focus (gdk_display,
                            frame->xwindow,
                            event->time);      
    }

  /* don't do the rest of this if on client area */
  if (control == META_FRAME_CONTROL_CLIENT_AREA)
    return FALSE; /* not on the frame, just passed through from client */
  
  /* We want to shade even if we have a GrabOp, since we'll have a move grab
   * if we double click the titlebar.
   */
  if (control == META_FRAME_CONTROL_TITLE &&
      event->button == 1 &&
      event->type == GDK_2BUTTON_PRESS)
    {
      return meta_frame_double_click_event (frame, event);
    }

  if (meta_core_get_grab_op (gdk_display) !=
      META_GRAB_OP_NONE)
    return FALSE; /* already up to something */  

  if (event->button == 1 &&
      (control == META_FRAME_CONTROL_MAXIMIZE ||
       control == META_FRAME_CONTROL_UNMAXIMIZE ||
       control == META_FRAME_CONTROL_MINIMIZE ||
       control == META_FRAME_CONTROL_DELETE ||
       control == META_FRAME_CONTROL_SHADE ||
       control == META_FRAME_CONTROL_UNSHADE ||
       control == META_FRAME_CONTROL_ABOVE ||
       control == META_FRAME_CONTROL_UNABOVE ||
       control == META_FRAME_CONTROL_STICK ||
       control == META_FRAME_CONTROL_UNSTICK ||
       control == META_FRAME_CONTROL_MENU))
    {
      MetaGrabOp op = META_GRAB_OP_NONE;

      switch (control)
        {
        case META_FRAME_CONTROL_MINIMIZE:
          op = META_GRAB_OP_CLICKING_MINIMIZE;
          break;
        case META_FRAME_CONTROL_MAXIMIZE:
          op = META_GRAB_OP_CLICKING_MAXIMIZE;
          break;
        case META_FRAME_CONTROL_UNMAXIMIZE:
          op = META_GRAB_OP_CLICKING_UNMAXIMIZE;
          break;
        case META_FRAME_CONTROL_DELETE:
          op = META_GRAB_OP_CLICKING_DELETE;
          break;
        case META_FRAME_CONTROL_MENU:
          op = META_GRAB_OP_CLICKING_MENU;
          break;
        case META_FRAME_CONTROL_SHADE:
          op = META_GRAB_OP_CLICKING_SHADE;
          break;
        case META_FRAME_CONTROL_UNSHADE:
          op = META_GRAB_OP_CLICKING_UNSHADE;
          break;
        case META_FRAME_CONTROL_ABOVE:
          op = META_GRAB_OP_CLICKING_ABOVE;
          break;
        case META_FRAME_CONTROL_UNABOVE:
          op = META_GRAB_OP_CLICKING_UNABOVE;
          break;
        case META_FRAME_CONTROL_STICK:
          op = META_GRAB_OP_CLICKING_STICK;
          break;
        case META_FRAME_CONTROL_UNSTICK:
          op = META_GRAB_OP_CLICKING_UNSTICK;
          break;
        default:
          g_assert_not_reached ();
          break;
        }

      meta_core_begin_grab_op (gdk_display,
                               frame->xwindow,
                               op,
                               TRUE,
                               TRUE,
                               event->button,
                               0,
                               event->time,
                               event->x_root,
                               event->y_root);      
      
      frame->prelit_control = control;
      redraw_control (frames, frame, control);

      if (op == META_GRAB_OP_CLICKING_MENU)
        {
          MetaFrameGeometry fgeom;
          GdkRectangle *rect;
          int dx, dy;
          
          meta_frames_calc_geometry (frames, frame, &fgeom);
          
          rect = control_rect (META_FRAME_CONTROL_MENU, &fgeom);

          /* get delta to convert to root coords */
          dx = event->x_root - event->x;
          dy = event->y_root - event->y;
          
          /* Align to the right end of the menu rectangle if RTL */
          if (meta_ui_get_direction() == META_UI_DIRECTION_RTL)
            dx += rect->width;

          meta_core_show_window_menu (gdk_display,
                                      frame->xwindow,
                                      rect->x + dx,
                                      rect->y + rect->height + dy,
                                      event->button,
                                      event->time);
        }
    }
  else if (event->button == 1 &&
           (control == META_FRAME_CONTROL_RESIZE_SE ||
            control == META_FRAME_CONTROL_RESIZE_S ||
            control == META_FRAME_CONTROL_RESIZE_SW ||
            control == META_FRAME_CONTROL_RESIZE_NE ||
            control == META_FRAME_CONTROL_RESIZE_N ||
            control == META_FRAME_CONTROL_RESIZE_NW ||
            control == META_FRAME_CONTROL_RESIZE_E ||
            control == META_FRAME_CONTROL_RESIZE_W))
    {
      MetaGrabOp op;
      gboolean titlebar_is_onscreen;
      
      op = META_GRAB_OP_NONE;
      
      switch (control)
        {
        case META_FRAME_CONTROL_RESIZE_SE:
          op = META_GRAB_OP_RESIZING_SE;
          break;
        case META_FRAME_CONTROL_RESIZE_S:
          op = META_GRAB_OP_RESIZING_S;
          break;
        case META_FRAME_CONTROL_RESIZE_SW:
          op = META_GRAB_OP_RESIZING_SW;
          break;
        case META_FRAME_CONTROL_RESIZE_NE:
          op = META_GRAB_OP_RESIZING_NE;
          break;
        case META_FRAME_CONTROL_RESIZE_N:
          op = META_GRAB_OP_RESIZING_N;
          break;
        case META_FRAME_CONTROL_RESIZE_NW:
          op = META_GRAB_OP_RESIZING_NW;
          break;
        case META_FRAME_CONTROL_RESIZE_E:
          op = META_GRAB_OP_RESIZING_E;
          break;
        case META_FRAME_CONTROL_RESIZE_W:
          op = META_GRAB_OP_RESIZING_W;
          break;
        default:
          g_assert_not_reached ();
          break;
        }

      meta_core_get (gdk_display, frame->xwindow,
                     META_CORE_IS_TITLEBAR_ONSCREEN, &titlebar_is_onscreen,
                     META_CORE_GET_END);

      if (!titlebar_is_onscreen)
        meta_core_show_window_menu (gdk_display,
                                    frame->xwindow,
                                    event->x_root,
                                    event->y_root,
                                    event->button,
                                    event->time);
      else
        meta_core_begin_grab_op (gdk_display,
                                 frame->xwindow,
                                 op,
                                 TRUE,
                                 TRUE,
                                 event->button,
                                 0,
                                 event->time,
                                 event->x_root,
                                 event->y_root);
    }
  else if (control == META_FRAME_CONTROL_TITLE &&
           event->button == 1)
    {
      MetaFrameFlags flags;

      meta_core_get (gdk_display, frame->xwindow,
                     META_CORE_GET_FRAME_FLAGS, &flags,
                     META_CORE_GET_END);

      if (flags & META_FRAME_ALLOWS_MOVE)
        {          
          meta_core_begin_grab_op (gdk_display,
                                   frame->xwindow,
                                   META_GRAB_OP_MOVING,
                                   TRUE,
                                   TRUE,
                                   event->button,
                                   0,
                                   event->time,
                                   event->x_root,
                                   event->y_root);
        }
    }
  else if (event->button == 2)
    {
      return meta_frame_middle_click_event (frame, event);
    }
  else if (event->button == 3)
    {
      return meta_frame_right_click_event (frame, event);
    }
  
  return TRUE;
}

void
meta_frames_notify_menu_hide (MetaFrames *frames)
{
  if (meta_core_get_grab_op (gdk_display) ==
      META_GRAB_OP_CLICKING_MENU)
    {
      Window grab_frame;

      grab_frame = meta_core_get_grab_frame (gdk_display);

      if (grab_frame != None)
        {
          MetaUIFrame *frame;

          frame = meta_frames_lookup_window (frames, grab_frame);

          if (frame)
            {
              redraw_control (frames, frame,
                              META_FRAME_CONTROL_MENU);
              meta_core_end_grab_op (gdk_display, CurrentTime);
            }
        }
    }
}

static gboolean
meta_frames_button_release_event    (GtkWidget           *widget,
                                     GdkEventButton      *event)
{
  MetaUIFrame *frame;
  MetaFrames *frames;
  MetaGrabOp op;
  
  frames = META_FRAMES (widget);
  
  frame = meta_frames_lookup_window (frames, GDK_WINDOW_XID (event->window));
  if (frame == NULL)
    return FALSE;

  clear_tip (frames);

  op = meta_core_get_grab_op (gdk_display);

  if (op == META_GRAB_OP_NONE)
    return FALSE;

  /* We only handle the releases we handled the presses for (things
   * involving frame controls). Window ops that don't require a
   * frame are handled in the Xlib part of the code, display.c/window.c
   */
  if (frame->xwindow == meta_core_get_grab_frame (gdk_display) &&
      ((int) event->button) == meta_core_get_grab_button (gdk_display))
    {
      MetaFrameControl control;

      control = get_control (frames, frame, event->x, event->y);
      
      switch (op)
        {
        case META_GRAB_OP_CLICKING_MINIMIZE:
          if (control == META_FRAME_CONTROL_MINIMIZE)
            meta_core_minimize (gdk_display, frame->xwindow);
          
          meta_core_end_grab_op (gdk_display, event->time);
          break;

        case META_GRAB_OP_CLICKING_MAXIMIZE:
          if (control == META_FRAME_CONTROL_MAXIMIZE)
          {
            /* Focus the window on the maximize */
            meta_core_user_focus (gdk_display,
                            frame->xwindow,
                            event->time);      
            meta_core_maximize (gdk_display, frame->xwindow);
          }
          meta_core_end_grab_op (gdk_display, event->time);
          break;

        case META_GRAB_OP_CLICKING_UNMAXIMIZE:
          if (control == META_FRAME_CONTROL_UNMAXIMIZE)
            meta_core_unmaximize (gdk_display, frame->xwindow);
          
          meta_core_end_grab_op (gdk_display, event->time);
          break;
          
        case META_GRAB_OP_CLICKING_DELETE:
          if (control == META_FRAME_CONTROL_DELETE)
            meta_core_delete (gdk_display, frame->xwindow, event->time);
          
          meta_core_end_grab_op (gdk_display, event->time);
          break;
          
        case META_GRAB_OP_CLICKING_MENU:
          meta_core_end_grab_op (gdk_display, event->time);
          break;

        case META_GRAB_OP_CLICKING_SHADE:
          if (control == META_FRAME_CONTROL_SHADE)
            meta_core_shade (gdk_display, frame->xwindow, event->time);
          
          meta_core_end_grab_op (gdk_display, event->time);
          break;
 
        case META_GRAB_OP_CLICKING_UNSHADE:
          if (control == META_FRAME_CONTROL_UNSHADE)
            meta_core_unshade (gdk_display, frame->xwindow, event->time);

          meta_core_end_grab_op (gdk_display, event->time);
          break;

        case META_GRAB_OP_CLICKING_ABOVE:
          if (control == META_FRAME_CONTROL_ABOVE)
            meta_core_make_above (gdk_display, frame->xwindow);
          
          meta_core_end_grab_op (gdk_display, event->time);
          break;
 
        case META_GRAB_OP_CLICKING_UNABOVE:
          if (control == META_FRAME_CONTROL_UNABOVE)
            meta_core_unmake_above (gdk_display, frame->xwindow);

          meta_core_end_grab_op (gdk_display, event->time);
          break;

        case META_GRAB_OP_CLICKING_STICK:
          if (control == META_FRAME_CONTROL_STICK)
            meta_core_stick (gdk_display, frame->xwindow);

          meta_core_end_grab_op (gdk_display, event->time);
          break;
 
        case META_GRAB_OP_CLICKING_UNSTICK:
          if (control == META_FRAME_CONTROL_UNSTICK)
            meta_core_unstick (gdk_display, frame->xwindow);

          meta_core_end_grab_op (gdk_display, event->time);
          break;
          
        default:
          break;
        }

      /* Update the prelit control regardless of what button the mouse
       * was released over; needed so that the new button can become
       * prelit so to let the user know that it can now be pressed.
       * :)
       */
      meta_frames_update_prelit_control (frames, frame, control);
    }
  
  return TRUE;
}

static void
meta_frames_update_prelit_control (MetaFrames      *frames,
                                   MetaUIFrame     *frame,
                                   MetaFrameControl control)
{
  MetaFrameControl old_control;
  MetaCursor cursor;


  meta_verbose ("Updating prelit control from %u to %u\n",
                frame->prelit_control, control);
  
  cursor = META_CURSOR_DEFAULT;
  
  switch (control)
    {
    case META_FRAME_CONTROL_CLIENT_AREA:
      break;
    case META_FRAME_CONTROL_NONE:
      break;
    case META_FRAME_CONTROL_TITLE:
      break;
    case META_FRAME_CONTROL_DELETE:
      break;
    case META_FRAME_CONTROL_MENU:
      break;
    case META_FRAME_CONTROL_MINIMIZE:
      break;
    case META_FRAME_CONTROL_MAXIMIZE:
      break;
    case META_FRAME_CONTROL_UNMAXIMIZE:
      break;
    case META_FRAME_CONTROL_SHADE:
      break;
    case META_FRAME_CONTROL_UNSHADE:
      break;
    case META_FRAME_CONTROL_ABOVE:
      break;
    case META_FRAME_CONTROL_UNABOVE:
      break;
    case META_FRAME_CONTROL_STICK:
      break;
    case META_FRAME_CONTROL_UNSTICK:
      break;
    case META_FRAME_CONTROL_RESIZE_SE:
      cursor = META_CURSOR_SE_RESIZE;
      break;
    case META_FRAME_CONTROL_RESIZE_S:
      cursor = META_CURSOR_SOUTH_RESIZE;
      break;
    case META_FRAME_CONTROL_RESIZE_SW:
      cursor = META_CURSOR_SW_RESIZE;
      break;
    case META_FRAME_CONTROL_RESIZE_N:
      cursor = META_CURSOR_NORTH_RESIZE;
      break;
    case META_FRAME_CONTROL_RESIZE_NE:
      cursor = META_CURSOR_NE_RESIZE;
      break;
    case META_FRAME_CONTROL_RESIZE_NW:
      cursor = META_CURSOR_NW_RESIZE;
      break;
    case META_FRAME_CONTROL_RESIZE_W:
      cursor = META_CURSOR_WEST_RESIZE;
      break;
    case META_FRAME_CONTROL_RESIZE_E:
      cursor = META_CURSOR_EAST_RESIZE;
      break;
    }        

  /* set/unset the prelight cursor */
  meta_core_set_screen_cursor (gdk_display,
                               frame->xwindow,
                               cursor);  

  switch (control)
    {
    case META_FRAME_CONTROL_MENU:
    case META_FRAME_CONTROL_MINIMIZE:
    case META_FRAME_CONTROL_MAXIMIZE:
    case META_FRAME_CONTROL_DELETE:
    case META_FRAME_CONTROL_SHADE:
    case META_FRAME_CONTROL_UNSHADE:
    case META_FRAME_CONTROL_ABOVE:
    case META_FRAME_CONTROL_UNABOVE:
    case META_FRAME_CONTROL_STICK:
    case META_FRAME_CONTROL_UNSTICK:
    case META_FRAME_CONTROL_UNMAXIMIZE:
      /* leave control set */
      break;
    default:
      /* Only prelight buttons */
      control = META_FRAME_CONTROL_NONE;
      break;
    }      

  if (control == frame->prelit_control)
    return;

  /* Save the old control so we can unprelight it */
  old_control = frame->prelit_control;

  frame->prelit_control = control;

  redraw_control (frames, frame, old_control);
  redraw_control (frames, frame, control);
}

static gboolean
meta_frames_motion_notify_event     (GtkWidget           *widget,
                                     GdkEventMotion      *event)
{
  MetaUIFrame *frame;
  MetaFrames *frames;
  MetaGrabOp grab_op;
  
  frames = META_FRAMES (widget);
  
  frame = meta_frames_lookup_window (frames, GDK_WINDOW_XID (event->window));
  if (frame == NULL)
    return FALSE;

  clear_tip (frames);

  frames->last_motion_frame = frame;

  grab_op = meta_core_get_grab_op (gdk_display);
  
  switch (grab_op)
    {
    case META_GRAB_OP_CLICKING_MENU:
    case META_GRAB_OP_CLICKING_DELETE:
    case META_GRAB_OP_CLICKING_MINIMIZE:
    case META_GRAB_OP_CLICKING_MAXIMIZE:
    case META_GRAB_OP_CLICKING_UNMAXIMIZE:
    case META_GRAB_OP_CLICKING_SHADE:
    case META_GRAB_OP_CLICKING_UNSHADE:
    case META_GRAB_OP_CLICKING_ABOVE:
    case META_GRAB_OP_CLICKING_UNABOVE:
    case META_GRAB_OP_CLICKING_STICK:
    case META_GRAB_OP_CLICKING_UNSTICK:
      {
        MetaFrameControl control;
        int x, y;
        
        gdk_window_get_pointer (frame->window, &x, &y, NULL);

        /* Control is set to none unless it matches
         * the current grab
         */
        control = get_control (frames, frame, x, y);
        if (! ((control == META_FRAME_CONTROL_MENU &&
                grab_op == META_GRAB_OP_CLICKING_MENU) ||
               (control == META_FRAME_CONTROL_DELETE &&
                grab_op == META_GRAB_OP_CLICKING_DELETE) ||
               (control == META_FRAME_CONTROL_MINIMIZE &&
                grab_op == META_GRAB_OP_CLICKING_MINIMIZE) ||
               ((control == META_FRAME_CONTROL_MAXIMIZE ||
                 control == META_FRAME_CONTROL_UNMAXIMIZE) &&
                (grab_op == META_GRAB_OP_CLICKING_MAXIMIZE ||
                 grab_op == META_GRAB_OP_CLICKING_UNMAXIMIZE)) ||
               (control == META_FRAME_CONTROL_SHADE &&
                grab_op == META_GRAB_OP_CLICKING_SHADE) ||
               (control == META_FRAME_CONTROL_UNSHADE &&
                grab_op == META_GRAB_OP_CLICKING_UNSHADE) ||
               (control == META_FRAME_CONTROL_ABOVE &&
                grab_op == META_GRAB_OP_CLICKING_ABOVE) ||
               (control == META_FRAME_CONTROL_UNABOVE &&
                grab_op == META_GRAB_OP_CLICKING_UNABOVE) ||
               (control == META_FRAME_CONTROL_STICK &&
                grab_op == META_GRAB_OP_CLICKING_STICK) ||
               (control == META_FRAME_CONTROL_UNSTICK &&
                grab_op == META_GRAB_OP_CLICKING_UNSTICK)))
           control = META_FRAME_CONTROL_NONE;
        
        /* Update prelit control and cursor */
        meta_frames_update_prelit_control (frames, frame, control);

        /* No tooltip while in the process of clicking */
      }
      break;
    case META_GRAB_OP_NONE:
      {
        MetaFrameControl control;
        int x, y;
        
        gdk_window_get_pointer (frame->window, &x, &y, NULL);

        control = get_control (frames, frame, x, y);

        /* Update prelit control and cursor */
        meta_frames_update_prelit_control (frames, frame, control);
        
        queue_tip (frames);
      }
      break;

    default:
      break;
    }
      
  return TRUE;
}

static gboolean
meta_frames_destroy_event           (GtkWidget           *widget,
                                     GdkEventAny         *event)
{
  MetaUIFrame *frame;
  MetaFrames *frames;

  frames = META_FRAMES (widget);

  frame = meta_frames_lookup_window (frames, GDK_WINDOW_XID (event->window));
  if (frame == NULL)
    return FALSE;
  
  return TRUE;
}

/* Cut and paste from GDK */
static GdkGC *
get_bg_gc (GdkWindow *window, int x_offset, int y_offset)
{
  GdkWindowObject *private = (GdkWindowObject *)window;
  guint gc_mask = 0;
  GdkGCValues gc_values;

  if (private->bg_pixmap == GDK_PARENT_RELATIVE_BG && private->parent)
    {
      return get_bg_gc (GDK_WINDOW (private->parent),
                        x_offset + private->x,
                        y_offset + private->y);
    }
  else if (private->bg_pixmap && 
           private->bg_pixmap != GDK_PARENT_RELATIVE_BG && 
           private->bg_pixmap != GDK_NO_BG)
    {
      gc_values.fill = GDK_TILED;
      gc_values.tile = private->bg_pixmap;
      gc_values.ts_x_origin = x_offset;
      gc_values.ts_y_origin = y_offset;
      
      gc_mask = GDK_GC_FILL | GDK_GC_TILE | GDK_GC_TS_X_ORIGIN | GDK_GC_TS_Y_ORIGIN;

      return gdk_gc_new_with_values (window, &gc_values, gc_mask);
    }
  else
    {
      GdkGC *gc = gdk_gc_new (window);

      gdk_gc_set_foreground (gc, &(private->bg_color));

      return gc;
    }
}

static void
clear_backing (GdkPixmap *pixmap,
               GdkWindow *window,
               int xoffset, int yoffset)
{
  GdkGC *tmp_gc = get_bg_gc (window, xoffset, yoffset);

  gdk_draw_rectangle (pixmap, tmp_gc, TRUE,
                      0, 0, -1, -1);
  
  g_object_unref (tmp_gc);
}

/* Returns a pixmap with a piece of the windows frame painted on it.
*/

static GdkPixmap *
generate_pixmap (MetaFrames *frames,
                 MetaUIFrame *frame,
                 MetaRectangle rect)
{
  GdkRectangle rectangle;
  GdkRegion *region;
  GdkPixmap *result;

  rectangle.x = rect.x;
  rectangle.y = rect.y;
  rectangle.width = MAX (rect.width, 1);
  rectangle.height = MAX (rect.height, 1);
  
  result = gdk_pixmap_new (frame->window,
                           rectangle.width, rectangle.height, -1);
  
  clear_backing (result, frame->window, rectangle.x, rectangle.y);

  region = gdk_region_rectangle (&rectangle);

  meta_frames_paint_to_drawable (frames, frame, result, region,
                                 -rectangle.x, -rectangle.y);

  gdk_region_destroy (region);

  return result;
}


static void
populate_cache (MetaFrames *frames,
                MetaUIFrame *frame)
{
  int top, bottom, left, right;
  int width, height;
  int frame_width, frame_height, screen_width, screen_height;
  CachedPixels *pixels;
  MetaFrameType frame_type;
  MetaFrameFlags frame_flags;
  int i;

  meta_core_get (gdk_display, frame->xwindow,
                 META_CORE_GET_FRAME_WIDTH, &frame_width,
                 META_CORE_GET_FRAME_HEIGHT, &frame_height,
                 META_CORE_GET_SCREEN_WIDTH, &screen_width,
                 META_CORE_GET_SCREEN_HEIGHT, &screen_height,
                 META_CORE_GET_CLIENT_WIDTH, &width,
                 META_CORE_GET_CLIENT_HEIGHT, &height,
                 META_CORE_GET_FRAME_TYPE, &frame_type,
                 META_CORE_GET_FRAME_FLAGS, &frame_flags,
                 META_CORE_GET_END);

  /* don't cache extremely large windows */
  if (frame_width > 2 * screen_width ||
      frame_height > 2 * screen_height)
    {
      return;
    }
  
  meta_theme_get_frame_borders (meta_theme_get_current (),
                                frame_type,
                                frame->text_height,
                                frame_flags,
                                &top, &bottom, &left, &right);

  pixels = get_cache (frames, frame);

  /* Setup the rectangles for the four frame borders. First top, then
     left, right and bottom. */
  pixels->piece[0].rect.x = 0;
  pixels->piece[0].rect.y = 0;
  pixels->piece[0].rect.width = left + width + right;
  pixels->piece[0].rect.height = top;

  pixels->piece[1].rect.x = 0;
  pixels->piece[1].rect.y = top;
  pixels->piece[1].rect.width = left;
  pixels->piece[1].rect.height = height;

  pixels->piece[2].rect.x = left + width;
  pixels->piece[2].rect.y = top;
  pixels->piece[2].rect.width = right;
  pixels->piece[2].rect.height = height;

  pixels->piece[3].rect.x = 0;
  pixels->piece[3].rect.y = top + height;
  pixels->piece[3].rect.width = left + width + right;
  pixels->piece[3].rect.height = bottom;

  for (i = 0; i < 4; i++)
    {
      CachedFramePiece *piece = &pixels->piece[i];
      if (!piece->pixmap)
        piece->pixmap = generate_pixmap (frames, frame, piece->rect);
    }
  
  if (frames->invalidate_cache_timeout_id)
    g_source_remove (frames->invalidate_cache_timeout_id);
  
  frames->invalidate_cache_timeout_id = g_timeout_add (1000, invalidate_cache_timeout, frames);

  if (!g_list_find (frames->invalidate_frames, frame))
    frames->invalidate_frames =
      g_list_prepend (frames->invalidate_frames, frame);
}

static void
clip_to_screen (GdkRegion *region, MetaUIFrame *frame)
{
  GdkRectangle frame_area;
  GdkRectangle screen_area = { 0, 0, 0, 0 };
  GdkRegion *tmp_region;
  
  /* Chop off stuff outside the screen; this optimization
   * is crucial to handle huge client windows,
   * like "xterm -geometry 1000x1000"
   */
  meta_core_get (gdk_display, frame->xwindow,
                 META_CORE_GET_FRAME_X, &frame_area.x,
                 META_CORE_GET_FRAME_Y, &frame_area.y,
                 META_CORE_GET_FRAME_WIDTH, &frame_area.width,
                 META_CORE_GET_FRAME_HEIGHT, &frame_area.height,
                 META_CORE_GET_SCREEN_WIDTH, &screen_area.height,
                 META_CORE_GET_SCREEN_HEIGHT, &screen_area.height,
                 META_CORE_GET_END);

  gdk_region_offset (region, frame_area.x, frame_area.y);

  tmp_region = gdk_region_rectangle (&frame_area);
  gdk_region_intersect (region, tmp_region);
  gdk_region_destroy (tmp_region);

  gdk_region_offset (region, - frame_area.x, - frame_area.y);
}

static void
subtract_from_region (GdkRegion *region, GdkDrawable *drawable,
                      gint x, gint y)
{
  GdkRectangle rect;
  GdkRegion *reg_rect;

  gdk_drawable_get_size (drawable, &rect.width, &rect.height);
  rect.x = x;
  rect.y = y;

  reg_rect = gdk_region_rectangle (&rect);
  gdk_region_subtract (region, reg_rect);
  gdk_region_destroy (reg_rect);
}

static void
cached_pixels_draw (CachedPixels *pixels,
                    GdkWindow *window,
                    GdkRegion *region)
{
  GdkGC *gc;
  int i;

  gc = gdk_gc_new (window);

  for (i = 0; i < 4; i++)
    {
      CachedFramePiece *piece;
      piece = &pixels->piece[i];
      
      if (piece->pixmap)
        {
          gdk_draw_drawable (window, gc, piece->pixmap,
                             0, 0,
                             piece->rect.x, piece->rect.y,
                             -1, -1);
          subtract_from_region (region, piece->pixmap,
          piece->rect.x, piece->rect.y);
        }
    }
  
  g_object_unref (gc);
}

static gboolean
meta_frames_expose_event (GtkWidget           *widget,
                          GdkEventExpose      *event)
{
  MetaUIFrame *frame;
  MetaFrames *frames;
  GdkRegion *region;
  CachedPixels *pixels;

  frames = META_FRAMES (widget);

  frame = meta_frames_lookup_window (frames, GDK_WINDOW_XID (event->window));
  if (frame == NULL)
    return FALSE;

  if (frames->expose_delay_count > 0)
    {
      /* Redraw this entire frame later */
      frame->expose_delayed = TRUE;
      return TRUE;
    }

  populate_cache (frames, frame);

  region = gdk_region_copy (event->region);
  
  pixels = get_cache (frames, frame);

  cached_pixels_draw (pixels, frame->window, region);
  
  clip_to_screen (region, frame);
  meta_frames_paint_to_drawable (frames, frame, frame->window, region, 0, 0);

  gdk_region_destroy (region);
  
  return TRUE;
}

/* How far off the screen edge the window decorations should
 * be drawn. Used only in meta_frames_paint_to_drawable, below.
 */
#define DECORATING_BORDER 100

static void
meta_frames_paint_to_drawable (MetaFrames   *frames,
                               MetaUIFrame  *frame,
                               GdkDrawable  *drawable,
                               GdkRegion    *region,
                               int           x_offset,
                               int           y_offset)
{
  GtkWidget *widget;
  MetaFrameFlags flags;
  MetaFrameType type;
  GdkPixbuf *mini_icon;
  GdkPixbuf *icon;
  int w, h;
  MetaButtonState button_states[META_BUTTON_TYPE_LAST];
  Window grab_frame;
  int i;
  MetaButtonLayout button_layout;
  MetaGrabOp grab_op;
  
  widget = GTK_WIDGET (frames);

  for (i = 0; i < META_BUTTON_TYPE_LAST; i++)
    button_states[i] = META_BUTTON_STATE_NORMAL;

  grab_frame = meta_core_get_grab_frame (gdk_display);
  grab_op = meta_core_get_grab_op (gdk_display);
  if (grab_frame != frame->xwindow)
    grab_op = META_GRAB_OP_NONE;
  
  /* Set prelight state */
  switch (frame->prelit_control)
    {
    case META_FRAME_CONTROL_MENU:
      if (grab_op == META_GRAB_OP_CLICKING_MENU)
        button_states[META_BUTTON_TYPE_MENU] = META_BUTTON_STATE_PRESSED;
      else
        button_states[META_BUTTON_TYPE_MENU] = META_BUTTON_STATE_PRELIGHT;
      break;
    case META_FRAME_CONTROL_MINIMIZE:
      if (grab_op == META_GRAB_OP_CLICKING_MINIMIZE)
        button_states[META_BUTTON_TYPE_MINIMIZE] = META_BUTTON_STATE_PRESSED;
      else
        button_states[META_BUTTON_TYPE_MINIMIZE] = META_BUTTON_STATE_PRELIGHT;
      break;
    case META_FRAME_CONTROL_MAXIMIZE:
      if (grab_op == META_GRAB_OP_CLICKING_MAXIMIZE)
        button_states[META_BUTTON_TYPE_MAXIMIZE] = META_BUTTON_STATE_PRESSED;
      else
        button_states[META_BUTTON_TYPE_MAXIMIZE] = META_BUTTON_STATE_PRELIGHT;
      break;
    case META_FRAME_CONTROL_UNMAXIMIZE:
      if (grab_op == META_GRAB_OP_CLICKING_UNMAXIMIZE)
        button_states[META_BUTTON_TYPE_MAXIMIZE] = META_BUTTON_STATE_PRESSED;
      else
        button_states[META_BUTTON_TYPE_MAXIMIZE] = META_BUTTON_STATE_PRELIGHT;
      break;
    case META_FRAME_CONTROL_SHADE:
      if (grab_op == META_GRAB_OP_CLICKING_SHADE)
        button_states[META_BUTTON_TYPE_SHADE] = META_BUTTON_STATE_PRESSED;
      else
        button_states[META_BUTTON_TYPE_SHADE] = META_BUTTON_STATE_PRELIGHT;
      break;
    case META_FRAME_CONTROL_UNSHADE:
      if (grab_op == META_GRAB_OP_CLICKING_UNSHADE)
        button_states[META_BUTTON_TYPE_UNSHADE] = META_BUTTON_STATE_PRESSED;
      else
        button_states[META_BUTTON_TYPE_UNSHADE] = META_BUTTON_STATE_PRELIGHT;
      break;
    case META_FRAME_CONTROL_ABOVE:
      if (grab_op == META_GRAB_OP_CLICKING_ABOVE)
        button_states[META_BUTTON_TYPE_ABOVE] = META_BUTTON_STATE_PRESSED;
      else
        button_states[META_BUTTON_TYPE_ABOVE] = META_BUTTON_STATE_PRELIGHT;
      break;
    case META_FRAME_CONTROL_UNABOVE:
      if (grab_op == META_GRAB_OP_CLICKING_UNABOVE)
        button_states[META_BUTTON_TYPE_UNABOVE] = META_BUTTON_STATE_PRESSED;
      else
        button_states[META_BUTTON_TYPE_UNABOVE] = META_BUTTON_STATE_PRELIGHT;
      break;
    case META_FRAME_CONTROL_STICK:
      if (grab_op == META_GRAB_OP_CLICKING_STICK)
        button_states[META_BUTTON_TYPE_STICK] = META_BUTTON_STATE_PRESSED;
      else
        button_states[META_BUTTON_TYPE_STICK] = META_BUTTON_STATE_PRELIGHT;
      break;
    case META_FRAME_CONTROL_UNSTICK:
      if (grab_op == META_GRAB_OP_CLICKING_UNSTICK)
        button_states[META_BUTTON_TYPE_UNSTICK] = META_BUTTON_STATE_PRESSED;
      else
        button_states[META_BUTTON_TYPE_UNSTICK] = META_BUTTON_STATE_PRELIGHT;
      break;
    case META_FRAME_CONTROL_DELETE:
      if (grab_op == META_GRAB_OP_CLICKING_DELETE)
        button_states[META_BUTTON_TYPE_CLOSE] = META_BUTTON_STATE_PRESSED;
      else
        button_states[META_BUTTON_TYPE_CLOSE] = META_BUTTON_STATE_PRELIGHT;
      break;
    default:
      break;
    }

  /* Map button function states to button position states */
  button_states[META_BUTTON_TYPE_LEFT_LEFT_BACKGROUND] =
    button_states[META_BUTTON_TYPE_MENU];
  button_states[META_BUTTON_TYPE_LEFT_MIDDLE_BACKGROUND] =
    META_BUTTON_STATE_NORMAL;
  button_states[META_BUTTON_TYPE_LEFT_RIGHT_BACKGROUND] =
    META_BUTTON_STATE_NORMAL;
  button_states[META_BUTTON_TYPE_RIGHT_LEFT_BACKGROUND] =
    button_states[META_BUTTON_TYPE_MINIMIZE];
  button_states[META_BUTTON_TYPE_RIGHT_MIDDLE_BACKGROUND] =
    button_states[META_BUTTON_TYPE_MAXIMIZE];
  button_states[META_BUTTON_TYPE_RIGHT_RIGHT_BACKGROUND] =
    button_states[META_BUTTON_TYPE_CLOSE];
  
  meta_core_get (gdk_display, frame->xwindow,
                 META_CORE_GET_FRAME_FLAGS, &flags,
                 META_CORE_GET_FRAME_TYPE, &type,
                 META_CORE_GET_MINI_ICON, &mini_icon,
                 META_CORE_GET_ICON, &icon,
                 META_CORE_GET_CLIENT_WIDTH, &w,
                 META_CORE_GET_CLIENT_HEIGHT, &h,
                 META_CORE_GET_END);

  meta_frames_ensure_layout (frames, frame);

  meta_prefs_get_button_layout (&button_layout);

  if (G_LIKELY (GDK_IS_WINDOW (drawable)))
    {
      /* A window; happens about 2/3 of the time */

      GdkRectangle area, *areas;
      int n_areas;
      int screen_width, screen_height;
      GdkRegion *edges, *tmp_region;
      int top, bottom, left, right;
 
      /* Repaint each side of the frame */

      meta_theme_get_frame_borders (meta_theme_get_current (),
                             type, frame->text_height, flags, 
                             &top, &bottom, &left, &right);

      meta_core_get (gdk_display, frame->xwindow,
                     META_CORE_GET_SCREEN_WIDTH, &screen_width,
                     META_CORE_GET_SCREEN_HEIGHT, &screen_height,
                     META_CORE_GET_END);

      edges = gdk_region_copy (region);

      /* Punch out the client area */

      area.x = left;
      area.y = top;
      area.width = w;
      area.height = h;
      tmp_region = gdk_region_rectangle (&area);
      gdk_region_subtract (edges, tmp_region);
      gdk_region_destroy (tmp_region);

      /* Now draw remaining portion of region */

      gdk_region_get_rectangles (edges, &areas, &n_areas);

      for (i = 0; i < n_areas; i++)
        {
          /* Bug 399529: clamp areas[i] so that it doesn't go too far
           * off the edge of the screen. This works around a GDK bug
           * which makes gdk_window_begin_paint_rect cause an X error
           * if the window is insanely huge. If the client is a GDK program
           * and does this, it will still probably cause an X error in that
           * program, but the last thing we want is for Metacity to crash
           * because it attempted to decorate the silly window.
           */

          areas[i].x = MAX (areas[i].x, -DECORATING_BORDER); 
          areas[i].y = MAX (areas[i].y, -DECORATING_BORDER); 
          if (areas[i].x+areas[i].width  > screen_width  + DECORATING_BORDER)
            areas[i].width  = MIN (0, screen_width  - areas[i].x);
          if (areas[i].y+areas[i].height > screen_height + DECORATING_BORDER)
            areas[i].height = MIN (0, screen_height - areas[i].y);

          /* Okay, so let's start painting. */

          gdk_window_begin_paint_rect (drawable, &areas[i]);

          meta_theme_draw_frame (meta_theme_get_current (),
            widget,
            drawable,
            NULL, /* &areas[i], */
            x_offset, y_offset,
            type,
            flags,
            w, h,
            frame->layout,
            frame->text_height,
            &button_layout,
            button_states,
            mini_icon, icon);

          gdk_window_end_paint (drawable);
        }

      g_free (areas);
      gdk_region_destroy (edges);

    }
  else
    {
      /* Not a window; happens about 1/3 of the time */

      meta_theme_draw_frame (meta_theme_get_current (),
                             widget,
                             drawable,
                             NULL,
                             x_offset, y_offset,
                             type,
                             flags,
                             w, h,
                             frame->layout,
                             frame->text_height,
                             &button_layout,
                             button_states,
                             mini_icon, icon);
    }

}

static void
meta_frames_set_window_background (MetaFrames   *frames,
                                   MetaUIFrame  *frame)
{
  MetaFrameFlags flags;
  MetaFrameType type;
  MetaFrameStyle *style;
  gboolean frame_exists;

  meta_core_get (gdk_display, frame->xwindow,
                 META_CORE_WINDOW_HAS_FRAME, &frame_exists,
                 META_CORE_GET_FRAME_FLAGS, &flags,
                 META_CORE_GET_FRAME_TYPE, &type,
                 META_CORE_GET_END);

  if (frame_exists)
    {
      style = meta_theme_get_frame_style (meta_theme_get_current (),
                                          type, flags);
    }

  if (frame_exists && style->window_background_color != NULL)
    {
      GdkColor color;
      GdkVisual *visual;

      meta_color_spec_render (style->window_background_color,
                              GTK_WIDGET (frames),
                              &color);

      /* Fill in color.pixel */

      gdk_rgb_find_color (gtk_widget_get_colormap (GTK_WIDGET (frames)),
                          &color);

      /* Set A in ARGB to window_background_alpha, if we have ARGB */

      visual = gtk_widget_get_visual (GTK_WIDGET (frames));
      if (visual->depth == 32) /* we have ARGB */
        {
          color.pixel = (color.pixel & 0xffffff) &
            style->window_background_alpha << 24;
        }

      gdk_window_set_background (frame->window, &color);
    }
  else
    {
      gtk_style_set_background (GTK_WIDGET (frames)->style,
                                frame->window, GTK_STATE_NORMAL);
    }
 }

static gboolean
meta_frames_enter_notify_event      (GtkWidget           *widget,
                                     GdkEventCrossing    *event)
{
  MetaUIFrame *frame;
  MetaFrames *frames;
  MetaFrameControl control;
  
  frames = META_FRAMES (widget);

  frame = meta_frames_lookup_window (frames, GDK_WINDOW_XID (event->window));
  if (frame == NULL)
    return FALSE;

  control = get_control (frames, frame, event->x, event->y);
  meta_frames_update_prelit_control (frames, frame, control);
  
  return TRUE;
}

static gboolean
meta_frames_leave_notify_event      (GtkWidget           *widget,
                                     GdkEventCrossing    *event)
{
  MetaUIFrame *frame;
  MetaFrames *frames;

  frames = META_FRAMES (widget);

  frame = meta_frames_lookup_window (frames, GDK_WINDOW_XID (event->window));
  if (frame == NULL)
    return FALSE;

  meta_frames_update_prelit_control (frames, frame, META_FRAME_CONTROL_NONE);
  
  clear_tip (frames);

  return TRUE;
}

static GdkRectangle*
control_rect (MetaFrameControl control,
              MetaFrameGeometry *fgeom)
{
  GdkRectangle *rect;
  
  rect = NULL;
  switch (control)
    {
    case META_FRAME_CONTROL_TITLE:
      rect = &fgeom->title_rect;
      break;
    case META_FRAME_CONTROL_DELETE:
      rect = &fgeom->close_rect.visible;
      break;
    case META_FRAME_CONTROL_MENU:
      rect = &fgeom->menu_rect.visible;
      break;
    case META_FRAME_CONTROL_MINIMIZE:
      rect = &fgeom->min_rect.visible;
      break;
    case META_FRAME_CONTROL_MAXIMIZE:
    case META_FRAME_CONTROL_UNMAXIMIZE:
      rect = &fgeom->max_rect.visible;
      break;
    case META_FRAME_CONTROL_SHADE:
      rect = &fgeom->shade_rect.visible;
      break;
    case META_FRAME_CONTROL_UNSHADE:
      rect = &fgeom->unshade_rect.visible;
      break;
    case META_FRAME_CONTROL_ABOVE:
      rect = &fgeom->above_rect.visible;
      break;
    case META_FRAME_CONTROL_UNABOVE:
      rect = &fgeom->unabove_rect.visible;
      break;
    case META_FRAME_CONTROL_STICK:
      rect = &fgeom->stick_rect.visible;
      break;
    case META_FRAME_CONTROL_UNSTICK:
      rect = &fgeom->unstick_rect.visible;
      break;
    case META_FRAME_CONTROL_RESIZE_SE:
      break;
    case META_FRAME_CONTROL_RESIZE_S:
      break;
    case META_FRAME_CONTROL_RESIZE_SW:
      break;
    case META_FRAME_CONTROL_RESIZE_N:
      break;
    case META_FRAME_CONTROL_RESIZE_NE:
      break;
    case META_FRAME_CONTROL_RESIZE_NW:
      break;
    case META_FRAME_CONTROL_RESIZE_W:
      break;
    case META_FRAME_CONTROL_RESIZE_E:
      break;
    case META_FRAME_CONTROL_NONE:
      break;
    case META_FRAME_CONTROL_CLIENT_AREA:
      break;
    }

  return rect;
}

#define RESIZE_EXTENDS 15
#define TOP_RESIZE_HEIGHT 2
static MetaFrameControl
get_control (MetaFrames *frames,
             MetaUIFrame *frame,
             int x, int y)
{
  MetaFrameGeometry fgeom;
  MetaFrameFlags flags;
  gboolean has_vert, has_horiz;
  GdkRectangle client;
  
  meta_frames_calc_geometry (frames, frame, &fgeom);

  client.x = fgeom.left_width;
  client.y = fgeom.top_height;
  client.width = fgeom.width - fgeom.left_width - fgeom.right_width;
  client.height = fgeom.height - fgeom.top_height - fgeom.bottom_height;  

  if (POINT_IN_RECT (x, y, client))
    return META_FRAME_CONTROL_CLIENT_AREA;
  
  if (POINT_IN_RECT (x, y, fgeom.close_rect.clickable))
    return META_FRAME_CONTROL_DELETE;

  if (POINT_IN_RECT (x, y, fgeom.min_rect.clickable))
    return META_FRAME_CONTROL_MINIMIZE;

  if (POINT_IN_RECT (x, y, fgeom.menu_rect.clickable))
    return META_FRAME_CONTROL_MENU;

  meta_core_get (gdk_display, frame->xwindow,
                 META_CORE_GET_FRAME_FLAGS, &flags,
                 META_CORE_GET_END);
  
  has_vert = (flags & META_FRAME_ALLOWS_VERTICAL_RESIZE) != 0;
  has_horiz = (flags & META_FRAME_ALLOWS_HORIZONTAL_RESIZE) != 0;
  
  if (POINT_IN_RECT (x, y, fgeom.title_rect))
    {
      if (has_vert && y <= TOP_RESIZE_HEIGHT)
        return META_FRAME_CONTROL_RESIZE_N;
      else
        return META_FRAME_CONTROL_TITLE;
    }

  if (POINT_IN_RECT (x, y, fgeom.max_rect.clickable))
    {
      if (flags & META_FRAME_MAXIMIZED)
        return META_FRAME_CONTROL_UNMAXIMIZE;
      else
        return META_FRAME_CONTROL_MAXIMIZE;
    }
      
  if (POINT_IN_RECT (x, y, fgeom.shade_rect.clickable))
    {
      return META_FRAME_CONTROL_SHADE;
    }

  if (POINT_IN_RECT (x, y, fgeom.unshade_rect.clickable))
    {
      return META_FRAME_CONTROL_UNSHADE;
    }

  if (POINT_IN_RECT (x, y, fgeom.above_rect.clickable))
    {
      return META_FRAME_CONTROL_ABOVE;
    }

  if (POINT_IN_RECT (x, y, fgeom.unabove_rect.clickable))
    {
      return META_FRAME_CONTROL_UNABOVE;
    }

  if (POINT_IN_RECT (x, y, fgeom.stick_rect.clickable))
    {
      return META_FRAME_CONTROL_STICK;
    }

  if (POINT_IN_RECT (x, y, fgeom.unstick_rect.clickable))
    {
      return META_FRAME_CONTROL_UNSTICK;
    }

  /* South resize always has priority over north resize,
   * in case of overlap.
   */

  if (y >= (fgeom.height - fgeom.bottom_height - RESIZE_EXTENDS) &&
      x >= (fgeom.width - fgeom.right_width - RESIZE_EXTENDS))
    {
      if (has_vert && has_horiz)
        return META_FRAME_CONTROL_RESIZE_SE;
      else if (has_vert)
        return META_FRAME_CONTROL_RESIZE_S;
      else if (has_horiz)
        return META_FRAME_CONTROL_RESIZE_E;
    }
  else if (y >= (fgeom.height - fgeom.bottom_height - RESIZE_EXTENDS) &&
           x <= (fgeom.left_width + RESIZE_EXTENDS))
    {
      if (has_vert && has_horiz)
        return META_FRAME_CONTROL_RESIZE_SW;
      else if (has_vert)
        return META_FRAME_CONTROL_RESIZE_S;
      else if (has_horiz)
        return META_FRAME_CONTROL_RESIZE_W;
    }
  else if (y < (fgeom.top_height + RESIZE_EXTENDS) &&
           x < RESIZE_EXTENDS)
    {
      if (has_vert && has_horiz)
        return META_FRAME_CONTROL_RESIZE_NW;
      else if (has_vert)
        return META_FRAME_CONTROL_RESIZE_N;
      else if (has_horiz)
        return META_FRAME_CONTROL_RESIZE_W;
    }
  else if (y < (fgeom.top_height + RESIZE_EXTENDS) &&
           x >= (fgeom.width - RESIZE_EXTENDS))
    {
      if (has_vert && has_horiz)
        return META_FRAME_CONTROL_RESIZE_NE;
      else if (has_vert)
        return META_FRAME_CONTROL_RESIZE_N;
      else if (has_horiz)
        return META_FRAME_CONTROL_RESIZE_E;
    }
  else if (y >= (fgeom.height - fgeom.bottom_height - RESIZE_EXTENDS))
    {
      if (has_vert)
        return META_FRAME_CONTROL_RESIZE_S;
    }
  else if (y <= TOP_RESIZE_HEIGHT)
    {
      if (has_vert)
        return META_FRAME_CONTROL_RESIZE_N;
      else if (has_horiz)
        return META_FRAME_CONTROL_TITLE;
    }
  else if (x <= fgeom.left_width)
    {
      if (has_horiz)
        return META_FRAME_CONTROL_RESIZE_W;
    }
  else if (x >= (fgeom.width - fgeom.right_width))
    {
      if (has_horiz)
        return META_FRAME_CONTROL_RESIZE_E;
    }

  if (y >= fgeom.top_height)
    return META_FRAME_CONTROL_NONE;
  else
    return META_FRAME_CONTROL_TITLE;
}

void
meta_frames_push_delay_exposes (MetaFrames *frames)
{
  if (frames->expose_delay_count == 0)
    {
      /* Make sure we've repainted things */
      gdk_window_process_all_updates ();
      XFlush (gdk_display);
    }
  
  frames->expose_delay_count += 1;
}

static void
queue_pending_exposes_func (gpointer key, gpointer value, gpointer data)
{
  MetaUIFrame *frame;
  MetaFrames *frames;

  frames = META_FRAMES (data);
  frame = value;

  if (frame->expose_delayed)
    {
      invalidate_whole_window (frames, frame);
      frame->expose_delayed = FALSE;
    }
}

void
meta_frames_pop_delay_exposes  (MetaFrames *frames)
{
  g_return_if_fail (frames->expose_delay_count > 0);
  
  frames->expose_delay_count -= 1;

  if (frames->expose_delay_count == 0)
    {
      g_hash_table_foreach (frames->frames,
                            queue_pending_exposes_func,
                            frames);
    }
}

static void
invalidate_whole_window (MetaFrames *frames,
                         MetaUIFrame *frame)
{
  gdk_window_invalidate_rect (frame->window, NULL, FALSE);
  invalidate_cache (frames, frame);
}

---