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260 lines
7.2 KiB
C
260 lines
7.2 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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void
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_gdk_x11_window_move_resize_child (GdkWindow *window,
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gint x,
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gint y,
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gint width,
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gint height)
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{
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GdkWindowImplX11 *impl;
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g_return_if_fail (window != NULL);
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g_return_if_fail (GDK_IS_WINDOW (window));
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impl = GDK_WINDOW_IMPL_X11 (window->impl);
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if (width * impl->window_scale > 65535 ||
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height * impl->window_scale > 65535)
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{
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g_warning ("Native children wider or taller than 65535 pixels are not supported");
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if (width * impl->window_scale > 65535)
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width = 65535 / impl->window_scale;
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if (height * impl->window_scale > 65535)
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height = 65535 / impl->window_scale;
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}
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window->x = x;
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window->y = y;
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impl->unscaled_width = width * impl->window_scale;
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impl->unscaled_height = height * impl->window_scale;
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window->width = width;
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window->height = height;
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/* We don't really care about origin overflow, because on overflow
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* the window won't be visible anyway and thus it will be shaped
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* to nothing
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*/
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XMoveResizeWindow (GDK_WINDOW_XDISPLAY (window),
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GDK_WINDOW_XID (window),
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(window->x + window->parent->abs_x) * impl->window_scale,
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(window->y + window->parent->abs_y) * impl->window_scale,
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width * impl->window_scale,
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height * impl->window_scale);
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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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