GdkRectangle *old_clip,
GdkRectangle *new_clip);
-static GSList *translate_queue = NULL;
+static GQueue *translate_queue = NULL;
void
_gdk_windowing_window_get_offsets (GdkWindow *window,
}
}
+Bool
+expose_serial_predicate (Display *xdisplay,
+ XEvent *xev,
+ XPointer arg)
+{
+ gulong *serial = (gulong *)arg;
+
+ if (xev->xany.type == Expose)
+ *serial = MIN (*serial, xev->xany.serial);
+
+ return False;
+}
+
+/* Find oldest possible serial for an outstanding expose event
+ */
+static gulong
+find_current_serial (Display *xdisplay)
+{
+ XEvent xev;
+ gulong serial = NextRequest (xdisplay);
+
+ XSync (xdisplay, False);
+
+ XCheckIfEvent (xdisplay, &xev, expose_serial_predicate, (XPointer)&serial);
+
+ return serial;
+}
+
+static void
+queue_delete_link (GQueue *queue,
+ GList *link)
+{
+ if (queue->tail == link)
+ queue->tail = link->prev;
+
+ queue->head = g_list_remove_link (queue->head, link);
+ g_list_free_1 (link);
+ queue->length--;
+}
+
+static void
+queue_item_free (GdkWindowQueueItem *item)
+{
+ gdk_drawable_unref (item->window);
+
+ if (item->type == GDK_WINDOW_QUEUE_ANTIEXPOSE)
+ gdk_region_destroy (item->u.antiexpose.area);
+
+ g_free (item);
+}
+
+static void
+gdk_window_queue (GdkWindow *window,
+ GdkWindowQueueItem *item)
+{
+ if (!translate_queue)
+ translate_queue = g_queue_new ();
+
+ /* Keep length of queue finite by, if it grows too long,
+ * figuring out the latest relevant serial and discarding
+ * irrelevant queue items.
+ */
+ if (translate_queue->length >= 64 )
+ {
+ gulong serial = find_current_serial (GDK_WINDOW_XDISPLAY (window));
+ GList *tmp_list = translate_queue->head;
+
+ while (tmp_list)
+ {
+ GdkWindowQueueItem *item = tmp_list->data;
+ GList *next = tmp_list->next;
+
+ if (serial > item->serial)
+ {
+ queue_delete_link (translate_queue, tmp_list);
+ queue_item_free (item);
+ }
+
+ tmp_list = next;
+ }
+ }
+
+ /* Catch the case where someone isn't processing events and there
+ * is an event stuck in the event queue with an old serial:
+ * If we can't reduce the queue length by the above method,
+ * discard anti-expose items. (We can't discard translate
+ * items
+ */
+ if (translate_queue->length >= 64 )
+ {
+ GList *tmp_list = translate_queue->head;
+
+ while (tmp_list)
+ {
+ GdkWindowQueueItem *item = tmp_list->data;
+ GList *next = tmp_list->next;
+
+ if (item->type == GDK_WINDOW_QUEUE_ANTIEXPOSE)
+ {
+ queue_delete_link (translate_queue, tmp_list);
+ queue_item_free (item);
+ }
+
+ tmp_list = next;
+ }
+ }
+
+ gdk_drawable_ref (window);
+
+ item->window = window;
+ item->serial = NextRequest (GDK_WINDOW_XDISPLAY (window));
+
+ g_queue_push_tail (translate_queue, item);
+}
+
static void
gdk_window_queue_translation (GdkWindow *window,
gint dx,
gint dy)
{
GdkWindowQueueItem *item = g_new (GdkWindowQueueItem, 1);
- item->window = window;
- item->serial = NextRequest (GDK_WINDOW_XDISPLAY (window));
item->type = GDK_WINDOW_QUEUE_TRANSLATE;
item->u.translate.dx = dx;
item->u.translate.dy = dy;
- gdk_drawable_ref (window);
- translate_queue = g_slist_append (translate_queue, item);
+ gdk_window_queue (window, item);
}
gboolean
GdkRegion *area)
{
GdkWindowQueueItem *item = g_new (GdkWindowQueueItem, 1);
- item->window = window;
- item->serial = NextRequest (GDK_WINDOW_XDISPLAY (window));
item->type = GDK_WINDOW_QUEUE_ANTIEXPOSE;
item->u.antiexpose.area = area;
- gdk_drawable_ref (window);
- translate_queue = g_slist_append (translate_queue, item);
+ gdk_window_queue (window, item);
return TRUE;
}
GdkWindowImplX11 *impl;
GdkRegion *invalidate_region = gdk_region_rectangle (area);
GdkRegion *clip_region;
- GSList *tmp_list = translate_queue;
-
+
impl = GDK_WINDOW_IMPL_X11 (GDK_WINDOW_OBJECT (window)->impl);
-
- while (tmp_list)
+
+ if (translate_queue)
{
- GdkWindowQueueItem *item = tmp_list->data;
- tmp_list = tmp_list->next;
-
- if (serial < item->serial)
+ GList *tmp_list = translate_queue->head;
+
+ while (tmp_list)
{
- if (item->window == window)
+ GdkWindowQueueItem *item = tmp_list->data;
+ tmp_list = tmp_list->next;
+
+ if (serial < item->serial)
{
- if (item->type == GDK_WINDOW_QUEUE_TRANSLATE)
- gdk_region_offset (invalidate_region, item->u.translate.dx, item->u.translate.dy);
- else /* anti-expose */
- gdk_region_subtract (invalidate_region, item->u.antiexpose.area);
+ if (item->window == window)
+ {
+ if (item->type == GDK_WINDOW_QUEUE_TRANSLATE)
+ gdk_region_offset (invalidate_region, item->u.translate.dx, item->u.translate.dy);
+ else /* anti-expose */
+ gdk_region_subtract (invalidate_region, item->u.antiexpose.area);
+ }
+ }
+ else
+ {
+ queue_delete_link (translate_queue, translate_queue->head);
+ queue_item_free (item);
}
- }
- else
- {
- GSList *tmp_link = translate_queue;
-
- translate_queue = g_slist_remove_link (translate_queue, translate_queue);
- gdk_drawable_unref (item->window);
-
- if (item->type == GDK_WINDOW_QUEUE_ANTIEXPOSE)
- gdk_region_destroy (item->u.antiexpose.area);
-
- g_free (item);
- g_slist_free_1 (tmp_link);
}
}