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gtk/gdk/x11/gdkgeometry-x11.c
Matthias Clasen fbf1093d5c Free the translate queue when closing a display 
Not that many people are ever going to hit this.
https://bugzilla.gnome.org/show_bug.cgi?id=645236
2011-04-08 21:34:25 -04:00

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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, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#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 _GdkWindowQueueItem GdkWindowQueueItem;
typedef struct _GdkWindowParentPos GdkWindowParentPos;
typedef enum {
GDK_WINDOW_QUEUE_TRANSLATE,
GDK_WINDOW_QUEUE_ANTIEXPOSE
} GdkWindowQueueType;
struct _GdkWindowQueueItem
{
GdkWindow *window;
gulong serial;
GdkWindowQueueType type;
union {
struct {
cairo_region_t *area;
gint dx;
gint dy;
} translate;
struct {
cairo_region_t *area;
} antiexpose;
} u;
};
void
_gdk_x11_window_move_resize_child (GdkWindow *window,
gint x,
gint y,
gint width,
gint height)
{
g_return_if_fail (window != NULL);
g_return_if_fail (GDK_IS_WINDOW (window));
if (width > 65535 ||
height > 65535)
{
g_warning ("Native children wider or taller than 65535 pixels are not supported");
if (width > 65535)
width = 65535;
if (height > 65535)
height = 65535;
}
window->x = x;
window->y = y;
window->width = width;
window->height = height;
/* We don't really care about origin overflow, because on overflow
* the window won't be visible anyway and thus it will be shaped
* to nothing
*/
_gdk_x11_window_tmp_unset_parent_bg (window);
_gdk_x11_window_tmp_unset_bg (window, TRUE);
XMoveResizeWindow (GDK_WINDOW_XDISPLAY (window),
GDK_WINDOW_XID (window),
window->x + window->parent->abs_x,
window->y + window->parent->abs_y,
width, height);
_gdk_x11_window_tmp_reset_parent_bg (window);
_gdk_x11_window_tmp_reset_bg (window, TRUE);
}
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 (GdkWindowQueueItem *item)
{
if (item->window)
{
g_object_remove_weak_pointer (G_OBJECT (item->window),
(gpointer *)&(item->window));
}
if (item->type == GDK_WINDOW_QUEUE_ANTIEXPOSE)
cairo_region_destroy (item->u.antiexpose.area);
else
{
if (item->u.translate.area)
cairo_region_destroy (item->u.translate.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_window_queue (GdkWindow *window,
GdkWindowQueueItem *item)
{
GdkX11Display *display_x11 = GDK_X11_DISPLAY (GDK_WINDOW_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_WINDOW_XDISPLAY (window));
GList *tmp_list = display_x11->translate_queue->head;
while (tmp_list)
{
GdkWindowQueueItem *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)
{
GdkWindowQueueItem *item = tmp_list->data;
GList *next = tmp_list->next;
if (item->type == GDK_WINDOW_QUEUE_ANTIEXPOSE)
{
queue_delete_link (display_x11->translate_queue, tmp_list);
queue_item_free (item);
}
tmp_list = next;
}
}
item->window = window;
item->serial = NextRequest (GDK_WINDOW_XDISPLAY (window));
g_object_add_weak_pointer (G_OBJECT (window),
(gpointer *)&(item->window));
g_queue_push_tail (display_x11->translate_queue, item);
}
static GC
_get_scratch_gc (GdkWindow *window, cairo_region_t *clip_region)
{
GdkX11Screen *screen;
XRectangle *rectangles;
gint n_rects;
gint depth;
screen = GDK_X11_SCREEN (gdk_window_get_screen (window));
depth = gdk_visual_get_depth (gdk_window_get_visual (window)) - 1;
if (!screen->subwindow_gcs[depth])
{
XGCValues values;
values.graphics_exposures = True;
values.subwindow_mode = IncludeInferiors;
screen->subwindow_gcs[depth] = XCreateGC (screen->xdisplay,
GDK_WINDOW_XID (window),
GCSubwindowMode | GCGraphicsExposures,
&values);
}
_gdk_x11_region_get_xrectangles (clip_region,
0, 0,
&rectangles,
&n_rects);
XSetClipRectangles (screen->xdisplay,
screen->subwindow_gcs[depth],
0, 0,
rectangles, n_rects,
YXBanded);
g_free (rectangles);
return screen->subwindow_gcs[depth];
}
void
_gdk_x11_window_translate (GdkWindow *window,
cairo_region_t *area,
gint dx,
gint dy)
{
GdkWindowQueueItem *item;
GC xgc;
GdkRectangle extents;
cairo_region_get_extents (area, &extents);
xgc = _get_scratch_gc (window, area);
cairo_region_translate (area, -dx, -dy); /* Move to source region */
item = g_new (GdkWindowQueueItem, 1);
item->type = GDK_WINDOW_QUEUE_TRANSLATE;
item->u.translate.area = cairo_region_copy (area);
item->u.translate.dx = dx;
item->u.translate.dy = dy;
gdk_window_queue (window, item);
XCopyArea (GDK_WINDOW_XDISPLAY (window),
GDK_WINDOW_XID (window),
GDK_WINDOW_XID (window),
xgc,
extents.x - dx, extents.y - dy,
extents.width, extents.height,
extents.x, extents.y);
}
gboolean
_gdk_x11_window_queue_antiexpose (GdkWindow *window,
cairo_region_t *area)
{
GdkWindowQueueItem *item = g_new (GdkWindowQueueItem, 1);
item->type = GDK_WINDOW_QUEUE_ANTIEXPOSE;
item->u.antiexpose.area = area;
gdk_window_queue (window, item);
return TRUE;
}
void
_gdk_x11_window_process_expose (GdkWindow *window,
gulong serial,
GdkRectangle *area)
{
cairo_region_t *invalidate_region = cairo_region_create_rectangle (area);
GdkX11Display *display_x11 = GDK_X11_DISPLAY (GDK_WINDOW_DISPLAY (window));
if (display_x11->translate_queue)
{
GList *tmp_list = display_x11->translate_queue->head;
while (tmp_list)
{
GdkWindowQueueItem *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)
{
if (item->type == GDK_WINDOW_QUEUE_TRANSLATE)
{
if (item->u.translate.area)
{
cairo_region_t *intersection;
intersection = cairo_region_copy (invalidate_region);
cairo_region_intersect (intersection, item->u.translate.area);
cairo_region_subtract (invalidate_region, intersection);
cairo_region_translate (intersection, item->u.translate.dx, item->u.translate.dy);
cairo_region_union (invalidate_region, intersection);
cairo_region_destroy (intersection);
}
else
cairo_region_translate (invalidate_region, item->u.translate.dx, item->u.translate.dy);
}
else /* anti-expose */
{
cairo_region_subtract (invalidate_region, item->u.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_window_invalidate_for_expose (window, invalidate_region);
cairo_region_destroy (invalidate_region);
}
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