muffin/src/compositor/meta-window-actor.c

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

#include <config.h>

#include <math.h>

#include <X11/extensions/shape.h>
#include <X11/extensions/Xcomposite.h>
#include <X11/extensions/Xdamage.h>
#include <X11/extensions/Xrender.h>

#include <clutter/x11/clutter-x11.h>
#define COGL_ENABLE_EXPERIMENTAL_API
#include <cogl/cogl-texture-pixmap-x11.h>
#include <gdk/gdk.h> /* for gdk_rectangle_union() */

#include <meta/display.h>
#include <meta/errors.h>
#include "frame.h"
#include <meta/window.h>
#include <meta/meta-shaped-texture.h>
#include "xprops.h"

#include "compositor-private.h"
#include "meta-shadow-factory-private.h"
#include "meta-window-actor-private.h"

enum {
  POSITION_CHANGED,
  SIZE_CHANGED,
  LAST_SIGNAL
};

static guint signals[LAST_SIGNAL] = {0};


struct _MetaWindowActorPrivate
{
  MetaWindow       *window;
  Window            xwindow;
  MetaScreen       *screen;

  ClutterActor     *actor;

  /* MetaShadowFactory only caches shadows that are actually in use;
   * to avoid unnecessary recomputation we do two things: 1) we store
   * both a focused and unfocused shadow for the window. If the window
   * doesn't have different focused and unfocused shadow parameters,
   * these will be the same. 2) when the shadow potentially changes we
   * don't immediately unreference the old shadow, we just flag it as
   * dirty and recompute it when we next need it (recompute_focused_shadow,
   * recompute_unfocused_shadow.) Because of our extraction of
   * size-invariant window shape, we'll often find that the new shadow
   * is the same as the old shadow.
   */
  MetaShadow       *focused_shadow;
  MetaShadow       *unfocused_shadow;

  Pixmap            back_pixmap;

  Damage            damage;

  guint8            opacity;
  guint8            shadow_opacity;

  gchar *           desc;

  /* If the window is shaped, a region that matches the shape */
  cairo_region_t   *shape_region;
  /* A rectangular region with the visible extents of the window */
  cairo_region_t   *bounding_region;
  /* The region we should clip to when painting the shadow */
  cairo_region_t   *shadow_clip;

  /* Extracted size-invariant shape used for shadows */
  MetaWindowShape  *shadow_shape;

  gint              last_width;
  gint              last_height;
  MetaFrameBorders  last_borders;

  gint              freeze_count;

  char *            shadow_class;

  /*
   * These need to be counters rather than flags, since more plugins
   * can implement same effect; the practicality of stacking effects
   * might be dubious, but we have to at least handle it correctly.
   */
  gint              minimize_in_progress;
  gint              maximize_in_progress;
  gint              unmaximize_in_progress;
  gint              map_in_progress;
  gint              destroy_in_progress;

  guint		    visible                : 1;
  guint		    mapped                 : 1;
  guint		    argb32                 : 1;
  guint		    disposed               : 1;
  guint             redecorating           : 1;

  guint		    needs_damage_all       : 1;
  guint		    received_damage        : 1;

  guint		    needs_pixmap           : 1;
  guint             needs_reshape          : 1;
  guint             recompute_focused_shadow   : 1;
  guint             recompute_unfocused_shadow : 1;
  guint		    size_changed           : 1;

  guint		    needs_destroy	   : 1;

  guint             no_shadow              : 1;

  guint             no_more_x_calls        : 1;

  guint             unredirected           : 1;
};

enum
{
  PROP_META_WINDOW = 1,
  PROP_META_SCREEN,
  PROP_X_WINDOW,
  PROP_X_WINDOW_ATTRIBUTES,
  PROP_NO_SHADOW,
  PROP_SHADOW_CLASS
};

#define DEFAULT_SHADOW_RADIUS 12
#define DEFAULT_SHADOW_X_OFFSET 0
#define DEFAULT_SHADOW_Y_OFFSET 8

static void meta_window_actor_dispose    (GObject *object);
static void meta_window_actor_finalize   (GObject *object);
static void meta_window_actor_constructed (GObject *object);
static void meta_window_actor_set_property (GObject       *object,
                                            guint         prop_id,
                                            const GValue *value,
                                            GParamSpec   *pspec);
static void meta_window_actor_get_property (GObject      *object,
                                            guint         prop_id,
                                            GValue       *value,
                                            GParamSpec   *pspec);

static void meta_window_actor_paint (ClutterActor *actor);

static gboolean meta_window_actor_get_paint_volume (ClutterActor       *actor,
                                                    ClutterPaintVolume *volume);


static void     meta_window_actor_detach     (MetaWindowActor *self);
static gboolean meta_window_actor_has_shadow (MetaWindowActor *self);

static void meta_window_actor_clear_shape_region    (MetaWindowActor *self);
static void meta_window_actor_clear_bounding_region (MetaWindowActor *self);
static void meta_window_actor_clear_shadow_clip     (MetaWindowActor *self);

G_DEFINE_TYPE (MetaWindowActor, meta_window_actor, CLUTTER_TYPE_GROUP);

static void
meta_window_actor_class_init (MetaWindowActorClass *klass)
{
  GObjectClass *object_class = G_OBJECT_CLASS (klass);
  ClutterActorClass *actor_class = CLUTTER_ACTOR_CLASS (klass);
  GParamSpec   *pspec;

  g_type_class_add_private (klass, sizeof (MetaWindowActorPrivate));

  object_class->dispose      = meta_window_actor_dispose;
  object_class->finalize     = meta_window_actor_finalize;
  object_class->set_property = meta_window_actor_set_property;
  object_class->get_property = meta_window_actor_get_property;
  object_class->constructed  = meta_window_actor_constructed;

  actor_class->paint = meta_window_actor_paint;
  actor_class->get_paint_volume = meta_window_actor_get_paint_volume;

  pspec = g_param_spec_object ("meta-window",
                               "MetaWindow",
                               "The displayed MetaWindow",
                               META_TYPE_WINDOW,
                               G_PARAM_READWRITE | G_PARAM_CONSTRUCT);

  g_object_class_install_property (object_class,
                                   PROP_META_WINDOW,
                                   pspec);

  pspec = g_param_spec_pointer ("meta-screen",
				"MetaScreen",
				"MetaScreen",
				G_PARAM_READWRITE | G_PARAM_CONSTRUCT);

  g_object_class_install_property (object_class,
                                   PROP_META_SCREEN,
                                   pspec);

  pspec = g_param_spec_ulong ("x-window",
			      "Window",
			      "Window",
			      0,
			      G_MAXULONG,
			      0,
			      G_PARAM_READWRITE | G_PARAM_CONSTRUCT);

  g_object_class_install_property (object_class,
                                   PROP_X_WINDOW,
                                   pspec);

  pspec = g_param_spec_boolean ("no-shadow",
                                "No shadow",
                                "Do not add shaddow to this window",
                                FALSE,
                                G_PARAM_READWRITE);

  g_object_class_install_property (object_class,
                                   PROP_NO_SHADOW,
                                   pspec);

  pspec = g_param_spec_string ("shadow-class",
                               "Name of the shadow class for this window.",
                               "NULL means to use the default shadow class for this window type",
                               NULL,
                               G_PARAM_READWRITE);

  g_object_class_install_property (object_class,
                                   PROP_SHADOW_CLASS,
                                   pspec);

  signals[POSITION_CHANGED] =
    g_signal_new ("position-changed",
                  G_TYPE_FROM_CLASS (klass),
                  G_SIGNAL_RUN_LAST,
                  0, NULL, NULL, NULL,
                  G_TYPE_NONE, 0);
  signals[SIZE_CHANGED] =
    g_signal_new ("size-changed",
                  G_TYPE_FROM_CLASS (klass),
                  G_SIGNAL_RUN_LAST,
                  0, NULL, NULL, NULL,
                  G_TYPE_NONE, 0);
}

static void
meta_window_actor_init (MetaWindowActor *self)
{
  MetaWindowActorPrivate *priv;

  priv = self->priv = G_TYPE_INSTANCE_GET_PRIVATE (self,
						   META_TYPE_WINDOW_ACTOR,
						   MetaWindowActorPrivate);
  priv->opacity = 0xff;
  priv->shadow_class = NULL;
}

static void
window_decorated_notify (MetaWindow *mw,
                         GParamSpec *arg1,
                         gpointer    data)
{
  MetaWindowActor        *self     = META_WINDOW_ACTOR (data);
  MetaWindowActorPrivate *priv     = self->priv;
  MetaFrame              *frame    = meta_window_get_frame (mw);
  MetaScreen             *screen   = priv->screen;
  MetaDisplay            *display  = meta_screen_get_display (screen);
  Display                *xdisplay = meta_display_get_xdisplay (display);
  Window                  new_xwindow;

  /*
   * Basically, we have to reconstruct the the internals of this object
   * from scratch, as everything has changed.
   */
  priv->redecorating = TRUE;

  if (frame)
    new_xwindow = meta_frame_get_xwindow (frame);
  else
    new_xwindow = meta_window_get_xwindow (mw);

  meta_window_actor_detach (self);

  /*
   * First of all, clean up any resources we are currently using and will
   * be replacing.
   */
  if (priv->damage != None)
    {
      meta_error_trap_push (display);
      XDamageDestroy (xdisplay, priv->damage);
      meta_error_trap_pop (display);
      priv->damage = None;
    }

  g_free (priv->desc);
  priv->desc = NULL;

  priv->xwindow = new_xwindow;

  /*
   * Recreate the contents.
   */
  meta_window_actor_constructed (G_OBJECT (self));
}

static void
window_appears_focused_notify (MetaWindow *mw,
                               GParamSpec *arg1,
                               gpointer    data)
{
  clutter_actor_queue_redraw (CLUTTER_ACTOR (data));
}

static void
meta_window_actor_constructed (GObject *object)
{
  MetaWindowActor        *self     = META_WINDOW_ACTOR (object);
  MetaWindowActorPrivate *priv     = self->priv;
  MetaScreen             *screen   = priv->screen;
  MetaDisplay            *display  = meta_screen_get_display (screen);
  Window                  xwindow  = priv->xwindow;
  MetaWindow             *window   = priv->window;
  Display                *xdisplay = meta_display_get_xdisplay (display);
  XRenderPictFormat      *format;

  priv->damage = XDamageCreate (xdisplay, xwindow,
                                XDamageReportBoundingBox);

  format = XRenderFindVisualFormat (xdisplay, window->xvisual);

  if (format && format->type == PictTypeDirect && format->direct.alphaMask)
    priv->argb32 = TRUE;

  if (!priv->actor)
    {
      priv->actor = meta_shaped_texture_new ();

      clutter_container_add_actor (CLUTTER_CONTAINER (self), priv->actor);

      /*
       * Since we are holding a pointer to this actor independently of the
       * ClutterContainer internals, and provide a public API to access it,
       * add a reference here, so that if someone is messing about with us
       * via the container interface, we do not end up with a dangling pointer.
       * We will release it in dispose().
       */
      g_object_ref (priv->actor);

      g_signal_connect (window, "notify::decorated",
                        G_CALLBACK (window_decorated_notify), self);
      g_signal_connect (window, "notify::appears-focused",
                        G_CALLBACK (window_appears_focused_notify), self);
    }
  else
    {
      /*
       * This is the case where existing window is gaining/loosing frame.
       * Just ensure the actor is top most (i.e., above shadow).
       */
      clutter_actor_raise_top (priv->actor);
    }

  meta_window_actor_update_opacity (self);
  meta_window_actor_update_shape (self);
}

static void
meta_window_actor_dispose (GObject *object)
{
  MetaWindowActor        *self = META_WINDOW_ACTOR (object);
  MetaWindowActorPrivate *priv = self->priv;
  MetaScreen             *screen;
  MetaDisplay            *display;
  Display                *xdisplay;
  MetaCompScreen         *info;

  if (priv->disposed)
    return;

  priv->disposed = TRUE;

  screen   = priv->screen;
  display  = meta_screen_get_display (screen);
  xdisplay = meta_display_get_xdisplay (display);
  info     = meta_screen_get_compositor_data (screen);

  meta_window_actor_detach (self);

  meta_window_actor_clear_shape_region (self);
  meta_window_actor_clear_bounding_region (self);
  meta_window_actor_clear_shadow_clip (self);

  if (priv->shadow_class != NULL)
    {
      g_free (priv->shadow_class);
      priv->shadow_class = NULL;
    }

  if (priv->focused_shadow != NULL)
    {
      meta_shadow_unref (priv->focused_shadow);
      priv->focused_shadow = NULL;
    }

  if (priv->unfocused_shadow != NULL)
    {
      meta_shadow_unref (priv->unfocused_shadow);
      priv->unfocused_shadow = NULL;
    }

  if (priv->shadow_shape != NULL)
    {
      meta_window_shape_unref (priv->shadow_shape);
      priv->shadow_shape = NULL;
    }

  if (priv->damage != None)
    {
      meta_error_trap_push (display);
      XDamageDestroy (xdisplay, priv->damage);
      meta_error_trap_pop (display);

      priv->damage = None;
    }

  info->windows = g_list_remove (info->windows, (gconstpointer) self);

  if (priv->window)
    {
      g_object_unref (priv->window);
      priv->window = NULL;
    }

  /*
   * Release the extra reference we took on the actor.
   */
  g_object_unref (priv->actor);
  priv->actor = NULL;

  G_OBJECT_CLASS (meta_window_actor_parent_class)->dispose (object);
}

static void
meta_window_actor_finalize (GObject *object)
{
  MetaWindowActor        *self = META_WINDOW_ACTOR (object);
  MetaWindowActorPrivate *priv = self->priv;

  g_free (priv->desc);

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

static void
meta_window_actor_set_property (GObject      *object,
                                guint         prop_id,
                                const GValue *value,
                                GParamSpec   *pspec)
{
  MetaWindowActor        *self   = META_WINDOW_ACTOR (object);
  MetaWindowActorPrivate *priv = self->priv;

  switch (prop_id)
    {
    case PROP_META_WINDOW:
      {
        if (priv->window)
          g_object_unref (priv->window);
        priv->window = g_value_dup_object (value);
      }
      break;
    case PROP_META_SCREEN:
      priv->screen = g_value_get_pointer (value);
      break;
    case PROP_X_WINDOW:
      priv->xwindow = g_value_get_ulong (value);
      break;
    case PROP_NO_SHADOW:
      {
        gboolean newv = g_value_get_boolean (value);

        if (newv == priv->no_shadow)
          return;

        priv->no_shadow = newv;

        meta_window_actor_invalidate_shadow (self);
      }
      break;
    case PROP_SHADOW_CLASS:
      {
        const char *newv = g_value_get_string (value);

        if (g_strcmp0 (newv, priv->shadow_class) == 0)
          return;

        g_free (priv->shadow_class);
        priv->shadow_class = g_strdup (newv);

        meta_window_actor_invalidate_shadow (self);
      }
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
    }
}

static void
meta_window_actor_get_property (GObject      *object,
                                guint         prop_id,
                                GValue       *value,
                                GParamSpec   *pspec)
{
  MetaWindowActorPrivate *priv = META_WINDOW_ACTOR (object)->priv;

  switch (prop_id)
    {
    case PROP_META_WINDOW:
      g_value_set_object (value, priv->window);
      break;
    case PROP_META_SCREEN:
      g_value_set_pointer (value, priv->screen);
      break;
    case PROP_X_WINDOW:
      g_value_set_ulong (value, priv->xwindow);
      break;
    case PROP_NO_SHADOW:
      g_value_set_boolean (value, priv->no_shadow);
      break;
    case PROP_SHADOW_CLASS:
      g_value_set_string (value, priv->shadow_class);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
    }
}

static const char *
meta_window_actor_get_shadow_class (MetaWindowActor *self)
{
  MetaWindowActorPrivate *priv = self->priv;

  if (priv->shadow_class != NULL)
    return priv->shadow_class;
  else
    {
      MetaWindowType window_type = meta_window_get_window_type (priv->window);

      switch (window_type)
        {
        case META_WINDOW_DROPDOWN_MENU:
          return "dropdown-menu";
        case META_WINDOW_POPUP_MENU:
          return "popup-menu";
        default:
          {
            MetaFrameType frame_type = meta_window_get_frame_type (priv->window);
            return meta_frame_type_to_string (frame_type);
          }
        }
    }
}

static void
meta_window_actor_get_shadow_params (MetaWindowActor  *self,
                                     gboolean          appears_focused,
                                     MetaShadowParams *params)
{
  const char *shadow_class = meta_window_actor_get_shadow_class (self);

  meta_shadow_factory_get_params (meta_shadow_factory_get_default (),
                                  shadow_class, appears_focused,
                                  params);
}

void
meta_window_actor_get_shape_bounds (MetaWindowActor       *self,
                                    cairo_rectangle_int_t *bounds)
{
  MetaWindowActorPrivate *priv = self->priv;

  /* We need to be defensive here because there are corner cases
   * where getting the shape fails on a window being destroyed
   * and similar.
   */
  if (priv->shape_region)
    cairo_region_get_extents (priv->shape_region, bounds);
  else if (priv->bounding_region)
    cairo_region_get_extents (priv->bounding_region, bounds);
  else
    bounds->x = bounds->y = bounds->width = bounds->height = 0;
}

static void
meta_window_actor_get_shadow_bounds (MetaWindowActor       *self,
                                     gboolean               appears_focused,
                                     cairo_rectangle_int_t *bounds)
{
  MetaWindowActorPrivate *priv = self->priv;
  MetaShadow *shadow = appears_focused ? priv->focused_shadow : priv->unfocused_shadow;
  cairo_rectangle_int_t shape_bounds;
  MetaShadowParams params;

  meta_window_actor_get_shape_bounds (self, &shape_bounds);
  meta_window_actor_get_shadow_params (self, appears_focused, &params);

  meta_shadow_get_bounds (shadow,
                          params.x_offset + shape_bounds.x,
                          params.y_offset + shape_bounds.y,
                          shape_bounds.width,
                          shape_bounds.height,
                          bounds);
}

/* If we have an ARGB32 window that we decorate with a frame, it's
 * probably something like a translucent terminal - something where
 * the alpha channel represents transparency rather than a shape.  We
 * don't want to show the shadow through the translucent areas since
 * the shadow is wrong for translucent windows (it should be
 * translucent itself and colored), and not only that, will /look/
 * horribly wrong - a misplaced big black blob. As a hack, what we
 * want to do is just draw the shadow as normal outside the frame, and
 * inside the frame draw no shadow.  This is also not even close to
 * the right result, but looks OK. We also apply this approach to
 * windows set to be partially translucent with _NET_WM_WINDOW_OPACITY.
 */
static gboolean
clip_shadow_under_window (MetaWindowActor *self)
{
  MetaWindowActorPrivate *priv = self->priv;

  return (priv->argb32 || priv->opacity != 0xff) && priv->window->frame;
}

static void
meta_window_actor_paint (ClutterActor *actor)
{
  MetaWindowActor *self = META_WINDOW_ACTOR (actor);
  MetaWindowActorPrivate *priv = self->priv;
  gboolean appears_focused = meta_window_appears_focused (priv->window);
  MetaShadow *shadow = appears_focused ? priv->focused_shadow : priv->unfocused_shadow;
  if (g_getenv ("MUFFIN_NO_SHADOWS")) {
      shadow = NULL;
  }

  if (shadow != NULL)
    {
      MetaShadowParams params;
      cairo_rectangle_int_t shape_bounds;
      cairo_region_t *clip = priv->shadow_clip;

      meta_window_actor_get_shape_bounds (self, &shape_bounds);
      meta_window_actor_get_shadow_params (self, appears_focused, &params);

      /* The frame bounds are already subtracted from priv->shadow_clip
       * if that exists.
       */
      if (!clip && clip_shadow_under_window (self))
        {
          cairo_region_t *frame_bounds = meta_window_get_frame_bounds (priv->window);
          cairo_rectangle_int_t bounds;

          meta_window_actor_get_shadow_bounds (self, appears_focused, &bounds);
          clip = cairo_region_create_rectangle (&bounds);

          cairo_region_subtract (clip, frame_bounds);
        }

      meta_shadow_paint (shadow,
                         params.x_offset + shape_bounds.x,
                         params.y_offset + shape_bounds.y,
                         shape_bounds.width,
                         shape_bounds.height,
                         (clutter_actor_get_paint_opacity (actor) * params.opacity * priv->opacity) / (255 * 255),
                         clip,
                         clip_shadow_under_window (self)); /* clip_strictly - not just as an optimization */

      if (clip && clip != priv->shadow_clip)
        cairo_region_destroy (clip);
    }

  CLUTTER_ACTOR_CLASS (meta_window_actor_parent_class)->paint (actor);
}

static gboolean
meta_window_actor_get_paint_volume (ClutterActor       *actor,
                                    ClutterPaintVolume *volume)
{
  MetaWindowActor *self = META_WINDOW_ACTOR (actor);
  MetaWindowActorPrivate *priv = self->priv;
  cairo_rectangle_int_t bounds;
  gboolean appears_focused = meta_window_appears_focused (priv->window);
  ClutterVertex origin;

  /* The paint volume is computed before paint functions are called
   * so our bounds might not be updated yet. Force an update. */
  meta_window_actor_pre_paint (self);

  meta_window_actor_get_shape_bounds (self, &bounds);

  if (appears_focused ? priv->focused_shadow : priv->unfocused_shadow)
    {
      cairo_rectangle_int_t shadow_bounds;

      /* We could compute an full clip region as we do for the window
       * texture, but the shadow is relatively cheap to draw, and
       * a little more complex to clip, so we just catch the case where
       * the shadow is completely obscured and doesn't need to be drawn
       * at all.
       */

      meta_window_actor_get_shadow_bounds (self, appears_focused, &shadow_bounds);
      gdk_rectangle_union (&bounds, &shadow_bounds, &bounds);
    }

  origin.x = bounds.x;
  origin.y = bounds.y;
  origin.z = 0.0f;
  clutter_paint_volume_set_origin (volume, &origin);

  clutter_paint_volume_set_width (volume, bounds.width);
  clutter_paint_volume_set_height (volume, bounds.height);

  return TRUE;
}

static gboolean
meta_window_actor_has_shadow (MetaWindowActor *self)
{
  MetaWindowActorPrivate *priv = self->priv;
  MetaWindowType window_type = meta_window_get_window_type (priv->window);

  if (priv->no_shadow)
    return FALSE;

  /* Leaving out shadows for maximized and fullscreen windows is an effeciency
   * win and also prevents the unsightly effect of the shadow of maximized
   * window appearing on an adjacent window */
  if ((meta_window_get_maximized (priv->window) == (META_MAXIMIZE_HORIZONTAL | META_MAXIMIZE_VERTICAL)) ||
      meta_window_is_fullscreen (priv->window))
    return FALSE;

  /*
   * If we have two snap-tiled windows, we don't want the shadow to obstruct
   * the other window.
   */
  if (meta_window_get_tile_match (priv->window))
    return FALSE;

  /*
   * Always put a shadow around windows with a frame - This should override
   * the restriction about not putting a shadow around ARGB windows.
   */
  if (priv->window)
    {
      if (meta_window_get_frame (priv->window))
	{
	  meta_verbose ("Window 0x%x has shadow because it has a frame\n",
			(guint)priv->xwindow);
	  return TRUE;
	}
    }

  /*
   * Do not add shadows to ARGB windows; eventually we should generate a
   * shadow from the input shape for such windows.
   */
  if (priv->argb32 || priv->opacity != 0xff)
    {
      meta_verbose ("Window 0x%x has no shadow as it is ARGB\n",
		    (guint)priv->xwindow);
      return FALSE;
    }

  /*
   * Add shadows to override redirect windows (e.g., Gtk menus).
   */
  if (priv->window->override_redirect)
    {
      meta_verbose ("Window 0x%x has shadow because it is override redirect.\n",
		    (guint)priv->xwindow);
      return TRUE;
    }

  /*
   * Don't put shadow around DND icon windows
   */
  if (window_type == META_WINDOW_DND ||
      window_type == META_WINDOW_DESKTOP)
    {
      meta_verbose ("Window 0x%x has no shadow as it is DND or Desktop\n",
		    (guint)priv->xwindow);
      return FALSE;
    }

  if (window_type == META_WINDOW_MENU
#if 0
      || window_type == META_WINDOW_DROPDOWN_MENU
#endif
      )
    {
      meta_verbose ("Window 0x%x has shadow as it is a menu\n",
		    (guint)priv->xwindow);
      return TRUE;
    }

#if 0
  if (window_type == META_WINDOW_TOOLTIP)
    {
      meta_verbose ("Window 0x%x has shadow as it is a tooltip\n",
		    (guint)priv->xwindow);
      return TRUE;
    }
#endif

  meta_verbose ("Window 0x%x has no shadow as it fell through\n",
		(guint)priv->xwindow);
  return FALSE;
}

/**
 * meta_window_actor_get_x_window: (skip)
 *
 */
Window
meta_window_actor_get_x_window (MetaWindowActor *self)
{
  if (!self)
    return None;

  return self->priv->xwindow;
}

/**
 * meta_window_actor_get_meta_window:
 *
 * Gets the #MetaWindow object that the the #MetaWindowActor is displaying
 *
 * Return value: (transfer none): the displayed #MetaWindow
 */
MetaWindow *
meta_window_actor_get_meta_window (MetaWindowActor *self)
{
  return self->priv->window;
}

/**
 * meta_window_actor_get_texture:
 *
 * Gets the ClutterActor that is used to display the contents of the window
 *
 * Return value: (transfer none): the #ClutterActor for the contents
 */
ClutterActor *
meta_window_actor_get_texture (MetaWindowActor *self)
{
  return self->priv->actor;
}

/**
 * meta_window_actor_is_destroyed:
 *
 * Gets whether the X window that the actor was displaying has been destroyed
 *
 * Return value: %TRUE when the window is destroyed, otherwise %FALSE
 */
gboolean
meta_window_actor_is_destroyed (MetaWindowActor *self)
{
  return self->priv->disposed;
}

gboolean
meta_window_actor_is_override_redirect (MetaWindowActor *self)
{
  return meta_window_is_override_redirect (self->priv->window);
}

const char *meta_window_actor_get_description (MetaWindowActor *self)
{
  /*
   * For windows managed by the WM, we just defer to the WM for the window
   * description. For override-redirect windows, we create the description
   * ourselves, but only on demand.
   */
  if (self->priv->window)
    return meta_window_get_description (self->priv->window);

  if (G_UNLIKELY (self->priv->desc == NULL))
    {
      self->priv->desc = g_strdup_printf ("Override Redirect (0x%x)",
                                         (guint) self->priv->xwindow);
    }

  return self->priv->desc;
}

/**
 * meta_window_actor_get_workspace:
 * @self: #MetaWindowActor
 *
 * Returns the index of workspace on which this window is located; if the
 * window is sticky, or is not currently located on any workspace, returns -1.
 * This function is deprecated  and should not be used in newly written code;
 * meta_window_get_workspace() instead.
 *
 * Return value: (transfer none): index of workspace on which this window is
 * located.
 */
gint
meta_window_actor_get_workspace (MetaWindowActor *self)
{
  MetaWindowActorPrivate *priv;
  MetaWorkspace          *workspace;

  if (!self)
    return -1;

  priv = self->priv;

  if (!priv->window || meta_window_is_on_all_workspaces (priv->window))
    return -1;

  workspace = meta_window_get_workspace (priv->window);

  if (!workspace)
    return -1;

  return meta_workspace_index (workspace);
}

gboolean
meta_window_actor_showing_on_its_workspace (MetaWindowActor *self)
{
  if (!self)
    return FALSE;

  /* If override redirect: */
  if (!self->priv->window)
    return TRUE;

  return meta_window_showing_on_its_workspace (self->priv->window);
}

static void
meta_window_actor_freeze (MetaWindowActor *self)
{
  self->priv->freeze_count++;
}

static void
meta_window_actor_damage_all (MetaWindowActor *self)
{
  MetaWindowActorPrivate *priv = self->priv;
  CoglHandle texture;

  if (!priv->needs_damage_all)
    return;

  texture = meta_shaped_texture_get_texture (META_SHAPED_TEXTURE (priv->actor));

  if (!priv->mapped || priv->needs_pixmap)
    return;

  meta_shaped_texture_update_area (META_SHAPED_TEXTURE (priv->actor),
                                   0, 0,
                                   cogl_texture_get_width (texture),
                                   cogl_texture_get_height (texture));

  priv->needs_damage_all = FALSE;
}

static void
meta_window_actor_thaw (MetaWindowActor *self)
{
  self->priv->freeze_count--;

  if (G_UNLIKELY (self->priv->freeze_count < 0))
    {
      g_warning ("Error in freeze/thaw accounting.");
      self->priv->freeze_count = 0;
      return;
    }

  if (self->priv->freeze_count)
    return;

  /* Since we ignore damage events while a window is frozen for certain effects
   * we may need to issue an update_area() covering the whole pixmap if we
   * don't know what real damage has happened. */

  if (self->priv->needs_damage_all)
    meta_window_actor_damage_all (self);
}

gboolean
meta_window_actor_effect_in_progress (MetaWindowActor *self)
{
  return (self->priv->minimize_in_progress ||
	  self->priv->maximize_in_progress ||
	  self->priv->unmaximize_in_progress ||
	  self->priv->map_in_progress ||
	  self->priv->destroy_in_progress);
}

static void
meta_window_actor_queue_create_pixmap (MetaWindowActor *self)
{
  MetaWindowActorPrivate *priv = self->priv;

  priv->needs_pixmap = TRUE;

  if (!priv->mapped)
    return;

  /* This will cause the compositor paint function to be run
   * if the actor is visible or a clone of the actor is visible.
   * if the actor isn't visible in any way, then we don't
   * need to repair the window anyways, and can wait until
   * the stage is redrawn for some other reason
   *
   * The compositor paint function repairs all windows.
   */
  clutter_actor_queue_redraw (priv->actor);
}

static gboolean
is_freeze_thaw_effect (gulong event)
{
  switch (event)
  {
  case META_PLUGIN_DESTROY:
  case META_PLUGIN_MAXIMIZE:
  case META_PLUGIN_UNMAXIMIZE:
    return TRUE;
    break;
  default:
    return FALSE;
  }
}

static gboolean
start_simple_effect (MetaWindowActor *self,
                     gulong        event)
{
  MetaWindowActorPrivate *priv = self->priv;
  MetaCompScreen *info = meta_screen_get_compositor_data (priv->screen);
  gint *counter = NULL;
  gboolean use_freeze_thaw = FALSE;

  if (!info->plugin_mgr)
    return FALSE;

  switch (event)
  {
  case META_PLUGIN_MINIMIZE:
    counter = &priv->minimize_in_progress;
    break;
  case META_PLUGIN_MAP:
    counter = &priv->map_in_progress;
    break;
  case META_PLUGIN_DESTROY:
    counter = &priv->destroy_in_progress;
    break;
  case META_PLUGIN_UNMAXIMIZE:
  case META_PLUGIN_MAXIMIZE:
  case META_PLUGIN_SWITCH_WORKSPACE:
    g_assert_not_reached ();
    break;
  }

  g_assert (counter);

  use_freeze_thaw = is_freeze_thaw_effect (event);

  if (use_freeze_thaw)
    meta_window_actor_freeze (self);

  (*counter)++;

  if (!meta_plugin_manager_event_simple (info->plugin_mgr,
                                         self,
                                         event))
    {
      (*counter)--;
      if (use_freeze_thaw)
        meta_window_actor_thaw (self);
      return FALSE;
    }

  return TRUE;
}

static void
meta_window_actor_after_effects (MetaWindowActor *self)
{
  MetaWindowActorPrivate *priv = self->priv;

  if (priv->needs_destroy)
    {
      clutter_actor_destroy (CLUTTER_ACTOR (self));
      return;
    }

  meta_window_actor_sync_visibility (self);
  meta_window_actor_sync_actor_position (self);

  if (!meta_window_is_mapped (priv->window))
    meta_window_actor_detach (self);

  if (priv->needs_pixmap)
    clutter_actor_queue_redraw (priv->actor);
}

void
meta_window_actor_effect_completed (MetaWindowActor *self,
                                    gulong           event)
{
  MetaWindowActorPrivate *priv   = self->priv;

  /* NB: Keep in mind that when effects get completed it possible
   * that the corresponding MetaWindow may have be been destroyed.
   * In this case priv->window will == NULL */

  switch (event)
  {
  case META_PLUGIN_MINIMIZE:
    {
      priv->minimize_in_progress--;
      if (priv->minimize_in_progress < 0)
	{
	  g_warning ("Error in minimize accounting.");
	  priv->minimize_in_progress = 0;
	}
    }
    break;
  case META_PLUGIN_MAP:
    /*
     * Make sure that the actor is at the correct place in case
     * the plugin fscked.
     */
    priv->map_in_progress--;

    if (priv->map_in_progress < 0)
      {
	g_warning ("Error in map accounting.");
	priv->map_in_progress = 0;
      }
    break;
  case META_PLUGIN_DESTROY:
    priv->destroy_in_progress--;

    if (priv->destroy_in_progress < 0)
      {
	g_warning ("Error in destroy accounting.");
	priv->destroy_in_progress = 0;
      }
    break;
  case META_PLUGIN_UNMAXIMIZE:
    priv->unmaximize_in_progress--;
    if (priv->unmaximize_in_progress < 0)
      {
	g_warning ("Error in unmaximize accounting.");
	priv->unmaximize_in_progress = 0;
      }
    break;
  case META_PLUGIN_MAXIMIZE:
    priv->maximize_in_progress--;
    if (priv->maximize_in_progress < 0)
      {
	g_warning ("Error in maximize accounting.");
	priv->maximize_in_progress = 0;
      }
    break;
  case META_PLUGIN_SWITCH_WORKSPACE:
    g_assert_not_reached ();
    break;
  }

  if (is_freeze_thaw_effect (event))
    meta_window_actor_thaw (self);

  if (!meta_window_actor_effect_in_progress (self))
    meta_window_actor_after_effects (self);