gtk/gdk/x11/gdkgeometry-x11.c
Alexander Larsson ed9cd90b72 Fix various problem with temporarily unsetting background
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)
2009-04-02 10:15:20 +02:00

442 lines
13 KiB
C

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