forked from AuroraMiddleware/gtk
5bf28a3869
We can't really support these on e.g. wayland anyway, and we're trying to get rid of subwindow at totally in the long term, so lets drop this. It allows us to drop a lot of complexity.
216 lines
5.7 KiB
C
216 lines
5.7 KiB
C
/* GDK - The GIMP Drawing Kit
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* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include "gdkinternals.h"
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#include "gdkrectangle.h"
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#include "gdkprivate-x11.h"
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#include "gdkscreen-x11.h"
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#include "gdkdisplay-x11.h"
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#include "gdkwindow-x11.h"
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typedef struct _GdkWindowQueueItem GdkWindowQueueItem;
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typedef struct _GdkWindowParentPos GdkWindowParentPos;
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struct _GdkWindowQueueItem
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{
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GdkWindow *window;
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gulong serial;
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cairo_region_t *antiexpose_area;
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};
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static Bool
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expose_serial_predicate (Display *xdisplay,
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XEvent *xev,
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XPointer arg)
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{
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gulong *serial = (gulong *)arg;
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if (xev->xany.type == Expose || xev->xany.type == GraphicsExpose)
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*serial = MIN (*serial, xev->xany.serial);
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return False;
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}
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/* Find oldest possible serial for an outstanding expose event
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*/
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static gulong
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find_current_serial (Display *xdisplay)
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{
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XEvent xev;
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gulong serial = NextRequest (xdisplay);
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XSync (xdisplay, False);
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XCheckIfEvent (xdisplay, &xev, expose_serial_predicate, (XPointer)&serial);
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return serial;
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}
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static void
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queue_delete_link (GQueue *queue,
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GList *link)
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{
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if (queue->tail == link)
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queue->tail = link->prev;
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queue->head = g_list_remove_link (queue->head, link);
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g_list_free_1 (link);
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queue->length--;
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}
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static void
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queue_item_free (GdkWindowQueueItem *item)
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{
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if (item->window)
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{
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g_object_remove_weak_pointer (G_OBJECT (item->window),
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(gpointer *)&(item->window));
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}
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cairo_region_destroy (item->antiexpose_area);
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g_free (item);
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}
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void
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_gdk_x11_display_free_translate_queue (GdkDisplay *display)
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{
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GdkX11Display *display_x11 = GDK_X11_DISPLAY (display);
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if (display_x11->translate_queue)
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{
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g_queue_foreach (display_x11->translate_queue, (GFunc)queue_item_free, NULL);
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g_queue_free (display_x11->translate_queue);
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display_x11->translate_queue = NULL;
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}
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}
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static void
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gdk_window_queue (GdkWindow *window,
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GdkWindowQueueItem *new_item)
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{
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GdkX11Display *display_x11 = GDK_X11_DISPLAY (GDK_WINDOW_DISPLAY (window));
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if (!display_x11->translate_queue)
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display_x11->translate_queue = g_queue_new ();
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/* Keep length of queue finite by, if it grows too long,
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* figuring out the latest relevant serial and discarding
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* irrelevant queue items.
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*/
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if (display_x11->translate_queue->length >= 64)
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{
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gulong serial = find_current_serial (GDK_WINDOW_XDISPLAY (window));
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GList *tmp_list = display_x11->translate_queue->head;
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while (tmp_list)
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{
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GdkWindowQueueItem *item = tmp_list->data;
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GList *next = tmp_list->next;
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/* an overflow-safe (item->serial < serial) */
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if (item->serial - serial > (gulong) G_MAXLONG)
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{
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queue_delete_link (display_x11->translate_queue, tmp_list);
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queue_item_free (item);
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}
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tmp_list = next;
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}
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}
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/* Catch the case where someone isn't processing events and there
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* is an event stuck in the event queue with an old serial:
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* If we can't reduce the queue length by the above method,
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* discard anti-expose items. (We can't discard translate
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* items
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*/
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if (display_x11->translate_queue->length >= 64)
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{
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GList *tmp_list = display_x11->translate_queue->head;
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while (tmp_list)
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{
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GdkWindowQueueItem *item = tmp_list->data;
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GList *next = tmp_list->next;
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queue_delete_link (display_x11->translate_queue, tmp_list);
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queue_item_free (item);
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tmp_list = next;
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}
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}
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new_item->window = window;
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new_item->serial = NextRequest (GDK_WINDOW_XDISPLAY (window));
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g_object_add_weak_pointer (G_OBJECT (window),
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(gpointer *)&(new_item->window));
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g_queue_push_tail (display_x11->translate_queue, new_item);
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}
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void
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_gdk_x11_window_queue_antiexpose (GdkWindow *window,
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cairo_region_t *area)
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{
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GdkWindowQueueItem *item = g_new (GdkWindowQueueItem, 1);
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item->antiexpose_area = cairo_region_reference (area);
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gdk_window_queue (window, item);
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}
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void
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_gdk_x11_window_process_expose (GdkWindow *window,
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gulong serial,
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GdkRectangle *area)
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{
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cairo_region_t *invalidate_region = cairo_region_create_rectangle (area);
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GdkX11Display *display_x11 = GDK_X11_DISPLAY (GDK_WINDOW_DISPLAY (window));
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if (display_x11->translate_queue)
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{
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GList *tmp_list = display_x11->translate_queue->head;
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while (tmp_list)
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{
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GdkWindowQueueItem *item = tmp_list->data;
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GList *next = tmp_list->next;
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/* an overflow-safe (serial < item->serial) */
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if (serial - item->serial > (gulong) G_MAXLONG)
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{
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if (item->window == window)
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cairo_region_subtract (invalidate_region, item->antiexpose_area);
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}
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else
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{
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queue_delete_link (display_x11->translate_queue, tmp_list);
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queue_item_free (item);
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}
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tmp_list = next;
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}
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}
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if (!cairo_region_is_empty (invalidate_region))
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_gdk_window_invalidate_for_expose (window, invalidate_region);
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cairo_region_destroy (invalidate_region);
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}
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