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ed9cd90b72
All the calls that unset private->parent failed if that was not a native window (impl), instead we need to find the impl window for the parent. Add some helper functions for this and use them. For move/resize of child windows, we really need to recursively unset on the parent, because moving the window could expose other native children of the parent. In do_shape_combine_region, only unset background if we're changing the bounding shape (i.e. not the input shape)
442 lines
13 KiB
C
442 lines
13 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, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/* gdkgeometry-x11.c: emulation of 32 bit coordinates within the
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* limits of X.
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*
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* By Owen Taylor <otaylor@redhat.com>
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* Copyright Red Hat, Inc. 2000
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*
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* The algorithms implemented in this file are an extension of the
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* idea of guffaw scrolling, a technique (and name) taken from the classic
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* Netscape source code. The basic idea of guffaw scrolling is a trick
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* to get around a limitation of X: there is no way of scrolling the
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* contents of a window. Guffaw scrolling exploits the X concepts of
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* window gravity and bit gravity:
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*
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* window gravity: the window gravity of a window affects what happens
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* to a windows position when _its parent_ is resized, or
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* moved and resized simultaneously.
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*
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* bit gravity: the bit gravity of a window affects what happens to
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* the pixels of a window when _it_ is is resized, or moved and
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* resized simultaneously.
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*
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* These were basically intended to do things like have right
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* justified widgets in a window automatically stay right justified
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* when the window was resized, but there is also the special
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* "StaticGravity" which means "do nothing." We can exploit
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* StaticGravity to scroll a window:
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*
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* | VISIBLE |
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*
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* |abcdefghijk|
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* |abcdefghijk | (1) Resize bigger
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* | efghijk | (2) Move
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* |efghijk | (3) Move-resize back to the original size
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*
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* Or, going the other way:
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* |abcdefghijk|
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* | abcdefghijk| (1) Move-resize bigger
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* | abcdefghijk| (2) Move
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* | abcdefg| (4) Resize back to the original size
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*
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* By using this technique, we can simulate scrolling around in a
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* large virtual space without having to actually have windows that
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* big; for the pixels of the window, this is all we have to do. For
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* subwindows, we have to take care of one other detail - since
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* coordinates in X are limited to 16 bits, subwindows scrolled off
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* will wrap around and come back eventually. So, we have to take care
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* to unmap windows that go outside the 16-bit range and remap them as
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* they come back in.
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*
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* Since we are temporarily making the window bigger, this only looks
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* good if the edges of the window are obscured. Typically, we do
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* this by making the window we are scrolling the immediate child
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* of a "clip window".
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*
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* But, this isn't a perfect API for applications for several reasons:
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*
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* - We have to use this inefficient technique even for small windows
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* if the window _could_ be big.
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* - Applications have to use a special scrolling API.
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*
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* What we'd like is to simply have windows with 32 bit coordinates
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* so applications could scroll in the classic way - just move a big
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* window around.
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*
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* It turns out that StaticGravity can also be used to achieve emulation
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* of 32 bit coordinates with only 16 bit coordinates if we expand
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* our horizons just a bit; what guffaw scrolling really is is a way
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* to move the contents of a window a different amount than we move
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* the borders of of the window. In the above example pictures we
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* ended up with the borders of the window not moving at all, but
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* that isn't necessary.
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*
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* So, what we do is set up a mapping from virtual 32 bit window position/size
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* to:
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*
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* - Real window position/size
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* - Offset between virtual coordinates and real coordinates for the window
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* - Map state (mapped or unmapped)
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*
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* By the following rules:
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*
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* - If the window is less than 32767 pixels in width (resp. height), we use it's
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* virtual width and position.
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* - Otherwise, we use a width of 32767 and determine the position of the window
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* so that the portion of the real window [16384, 16383] in _toplevel window
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* coordinates_ is the same as the portion of the real window
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*
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* This is implemented in gdk_window_compute_position(). Then the algorithm
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* for a moving a window (_window_move_resize_child ()) is:
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*
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* - Compute the new window mappings for the window and all subwindows
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* - Expand out the boundary of the window and all subwindows by the amount
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* that the real/virtual offset changes for each window.
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* (compute_intermediate_position() computes expanded boundary)
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* - Move the toplevel by the amount that it's contents need to translate.
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* - Move/resize the window and all subwindows to the newly computed
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* positions.
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*
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* If we just are scrolling (gdk_window_guffaw_scroll()), then things
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* are similar, except that the final mappings for the toplevel are
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* the same as the initial mappings, but we act as if it moved by the
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* amount we are scrolling by.
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*
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* Note that we don't have to worry about a clip window in
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* _gdk_window_move_resize() since we have set up our translation so
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* that things in the range [16384,16383] in toplevel window
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* coordinates look exactly as they would if we were simply moving the
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* windows, and nothing outside this range is going to be visible
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* unless the user has a _really_ huge screen.
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*/
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#include "config.h"
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#include "gdk.h" /* For gdk_rectangle_intersect */
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#include "gdkprivate-x11.h"
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#include "gdkx.h"
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#include "gdkregion.h"
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#include "gdkinternals.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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#include "gdkalias.h"
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typedef struct _GdkWindowQueueItem GdkWindowQueueItem;
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typedef struct _GdkWindowParentPos GdkWindowParentPos;
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typedef enum {
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GDK_WINDOW_QUEUE_TRANSLATE,
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GDK_WINDOW_QUEUE_ANTIEXPOSE
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} GdkWindowQueueType;
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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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GdkWindowQueueType type;
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union {
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struct {
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GdkRegion *area;
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gint dx;
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gint dy;
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} translate;
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struct {
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GdkRegion *area;
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} antiexpose;
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} u;
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};
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static void
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move (GdkWindow *window, GdkRectangle *pos)
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{
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XMoveWindow (GDK_WINDOW_XDISPLAY (window),
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GDK_WINDOW_XID (window), pos->x, pos->y);
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}
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static void
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move_resize (GdkWindow *window, GdkRectangle *pos)
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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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pos->x, pos->y, pos->width, pos->height);
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}
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void
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_gdk_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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GdkWindowObject *obj;
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GdkRectangle new_info;
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gboolean is_resize;
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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 (GDK_WINDOW_OBJECT (window)->impl);
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obj = GDK_WINDOW_OBJECT (window);
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is_resize =
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width != obj->width ||
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height != obj->height;
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obj->x = x;
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obj->y = y;
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obj->width = width;
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obj->height = height;
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new_info.x = obj->x + obj->parent->abs_x;
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new_info.y = obj->y + obj->parent->abs_y;
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new_info.width = obj->width;
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new_info.height = obj->height;
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_gdk_x11_window_tmp_unset_parent_bg (window, TRUE);
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if (is_resize)
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move_resize (window, &new_info);
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else
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move (window, &new_info);
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_gdk_x11_window_tmp_reset_parent_bg (window, TRUE);
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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)
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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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if (item->type == GDK_WINDOW_QUEUE_ANTIEXPOSE)
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gdk_region_destroy (item->u.antiexpose.area);
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else
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{
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if (item->u.translate.area)
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gdk_region_destroy (item->u.translate.area);
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}
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g_free (item);
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}
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static void
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gdk_window_queue (GdkWindow *window,
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GdkWindowQueueItem *item)
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{
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GdkDisplayX11 *display_x11 = GDK_DISPLAY_X11 (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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if (item->type == GDK_WINDOW_QUEUE_ANTIEXPOSE)
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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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item->window = window;
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item->serial = NextRequest (GDK_WINDOW_XDISPLAY (window));
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g_object_add_weak_pointer (G_OBJECT (window),
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(gpointer *)&(item->window));
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g_queue_push_tail (display_x11->translate_queue, item);
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}
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void
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_gdk_x11_window_queue_translation (GdkWindow *window,
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GdkRegion *area,
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gint dx,
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gint dy)
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{
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GdkWindowQueueItem *item = g_new (GdkWindowQueueItem, 1);
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item->type = GDK_WINDOW_QUEUE_TRANSLATE;
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item->u.translate.area = area ? gdk_region_copy (area) : NULL;
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item->u.translate.dx = dx;
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item->u.translate.dy = dy;
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gdk_window_queue (window, item);
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}
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gboolean
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_gdk_x11_window_queue_antiexpose (GdkWindow *window,
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GdkRegion *area)
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{
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GdkWindowQueueItem *item = g_new (GdkWindowQueueItem, 1);
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item->type = GDK_WINDOW_QUEUE_ANTIEXPOSE;
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item->u.antiexpose.area = area;
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gdk_window_queue (window, item);
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return TRUE;
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}
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void
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_gdk_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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GdkWindowImplX11 *impl;
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GdkRegion *invalidate_region = gdk_region_rectangle (area);
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GdkDisplayX11 *display_x11 = GDK_DISPLAY_X11 (GDK_WINDOW_DISPLAY (window));
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impl = GDK_WINDOW_IMPL_X11 (GDK_WINDOW_OBJECT (window)->impl);
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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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{
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if (item->type == GDK_WINDOW_QUEUE_TRANSLATE)
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{
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if (item->u.translate.area)
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{
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GdkRegion *intersection;
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intersection = gdk_region_copy (invalidate_region);
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gdk_region_intersect (intersection, item->u.translate.area);
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gdk_region_subtract (invalidate_region, intersection);
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gdk_region_offset (intersection, item->u.translate.dx, item->u.translate.dy);
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gdk_region_union (invalidate_region, intersection);
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gdk_region_destroy (intersection);
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}
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else
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gdk_region_offset (invalidate_region, item->u.translate.dx, item->u.translate.dy);
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}
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else /* anti-expose */
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{
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gdk_region_subtract (invalidate_region, item->u.antiexpose.area);
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}
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}
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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 (!gdk_region_empty (invalidate_region))
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_gdk_window_invalidate_for_expose (window, invalidate_region);
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gdk_region_destroy (invalidate_region);
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}
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#define __GDK_GEOMETRY_X11_C__
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#include "gdkaliasdef.c"
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