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/* GDK - The GIMP Drawing Kit
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include "gdkinternals.h"
#include "gdkrectangle.h"
#include "gdkprivate-x11.h"
#include "gdkscreen-x11.h"
#include "gdkdisplay-x11.h"
#include "gdkwindow-x11.h"
typedef struct _GdkSurfaceQueueItem GdkSurfaceQueueItem;
typedef struct _GdkSurfaceParentPos GdkSurfaceParentPos;
struct _GdkSurfaceQueueItem
{
GdkSurface *window;
gulong serial;
cairo_region_t *antiexpose_area;
};
static Bool
expose_serial_predicate (Display *xdisplay,
XEvent *xev,
XPointer arg)
{
gulong *serial = (gulong *)arg;
if (xev->xany.type == Expose || xev->xany.type == GraphicsExpose)
*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 (GdkSurfaceQueueItem *item)
{
if (item->window)
{
g_object_remove_weak_pointer (G_OBJECT (item->window),
(gpointer *)&(item->window));
}
cairo_region_destroy (item->antiexpose_area);
g_free (item);
}
void
_gdk_x11_display_free_translate_queue (GdkDisplay *display)
{
GdkX11Display *display_x11 = GDK_X11_DISPLAY (display);
if (display_x11->translate_queue)
{
g_queue_foreach (display_x11->translate_queue, (GFunc)queue_item_free, NULL);
g_queue_free (display_x11->translate_queue);
display_x11->translate_queue = NULL;
}
}
static void
gdk_surface_queue (GdkSurface *window,
GdkSurfaceQueueItem *new_item)
{
GdkX11Display *display_x11 = GDK_X11_DISPLAY (GDK_SURFACE_DISPLAY (window));
if (!display_x11->translate_queue)
display_x11->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 (display_x11->translate_queue->length >= 64)
{
gulong serial = find_current_serial (GDK_SURFACE_XDISPLAY (window));
GList *tmp_list = display_x11->translate_queue->head;
while (tmp_list)
{
GdkSurfaceQueueItem *item = tmp_list->data;
GList *next = tmp_list->next;
/* an overflow-safe (item->serial < serial) */
if (item->serial - serial > (gulong) G_MAXLONG)
{
queue_delete_link (display_x11->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 (display_x11->translate_queue->length >= 64)
{
GList *tmp_list = display_x11->translate_queue->head;
while (tmp_list)
{
GdkSurfaceQueueItem *item = tmp_list->data;
GList *next = tmp_list->next;
queue_delete_link (display_x11->translate_queue, tmp_list);
queue_item_free (item);
tmp_list = next;
}
}
new_item->window = window;
new_item->serial = NextRequest (GDK_SURFACE_XDISPLAY (window));
g_object_add_weak_pointer (G_OBJECT (window),
(gpointer *)&(new_item->window));
g_queue_push_tail (display_x11->translate_queue, new_item);
}
void
_gdk_x11_surface_queue_antiexpose (GdkSurface *window,
cairo_region_t *area)
{
GdkSurfaceQueueItem *item = g_new (GdkSurfaceQueueItem, 1);
item->antiexpose_area = cairo_region_reference (area);
gdk_surface_queue (window, item);
}
void
_gdk_x11_surface_process_expose (GdkSurface *window,
gulong serial,
GdkRectangle *area)
{
cairo_region_t *invalidate_region = cairo_region_create_rectangle (area);
GdkX11Display *display_x11 = GDK_X11_DISPLAY (GDK_SURFACE_DISPLAY (window));
if (display_x11->translate_queue)
{
GList *tmp_list = display_x11->translate_queue->head;
while (tmp_list)
{
GdkSurfaceQueueItem *item = tmp_list->data;
GList *next = tmp_list->next;
/* an overflow-safe (serial < item->serial) */
if (serial - item->serial > (gulong) G_MAXLONG)
{
if (item->window == window)
cairo_region_subtract (invalidate_region, item->antiexpose_area);
}
else
{
queue_delete_link (display_x11->translate_queue, tmp_list);
queue_item_free (item);
}
tmp_list = next;
}
}
if (!cairo_region_is_empty (invalidate_region))
_gdk_surface_invalidate_for_expose (window, invalidate_region);
cairo_region_destroy (invalidate_region);
}
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