gtk/gdk/x11/gdkgeometry-x11.c
Emmanuele Bassi e27632cd6d Abstract some GdkWindow API into an interface that the backends must
2008-06-27  Emmanuele Bassi  <ebassi@gnome.org>

	Abstract some GdkWindow API into an interface that the backends
	must implement. (based on a patch by Alex Larsson)

	* gdk/Makefile.am: Add gdkwindowimpl.[ch]

	* gdk/gdk.symbols: Move symbols around.

	* gdk/gdkinternals.h:
	* gdk/gdkwindowimpl.[ch]: Move some of the GdkWindow API we require
	from the backends to a GInterface that the backends should implement
	instead.

	* gdk/gdkwindow.c: Provide some of the GdkWindow public API as a
	wrapper call around the GdkWindowImpl interface vtable.

	* gdk/x11/gdkevents-x11.c:
	* gdk/x11/gdkgeometry-x11.c:
	* gdk/x11/gdkprivate-x11.h:
	* gdk/x11/gdkwindow-x11.c:
	* gdk/x11/gdkwindow-x11.h: Update the X11 backend to implement
	the GdkWindowImpl interface.

svn path=/trunk/; revision=20695
2008-06-27 14:27:44 +00:00

1192 lines
35 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;
};
struct _GdkWindowParentPos
{
gint x;
gint y;
gint x11_x;
gint x11_y;
GdkRectangle clip_rect;
};
static void gdk_window_compute_position (GdkWindowImplX11 *window,
GdkWindowParentPos *parent_pos,
GdkXPositionInfo *info);
static void gdk_window_compute_parent_pos (GdkWindowImplX11 *window,
GdkWindowParentPos *parent_pos);
static void gdk_window_premove (GdkWindow *window,
GdkWindowParentPos *parent_pos);
static void gdk_window_postmove (GdkWindow *window,
GdkWindowParentPos *parent_pos);
static void gdk_window_queue_translation (GdkWindow *window,
GdkRegion *area,
gint dx,
gint dy);
static void gdk_window_clip_changed (GdkWindow *window,
GdkRectangle *old_clip,
GdkRectangle *new_clip);
void
_gdk_x11_window_get_offsets (GdkWindow *window,
gint *x_offset,
gint *y_offset)
{
GdkWindowImplX11 *impl =
GDK_WINDOW_IMPL_X11 (GDK_WINDOW_OBJECT (window)->impl);
*x_offset = impl->position_info.x_offset;
*y_offset = impl->position_info.y_offset;
}
void
_gdk_window_init_position (GdkWindow *window)
{
GdkWindowParentPos parent_pos;
GdkWindowImplX11 *impl;
g_return_if_fail (GDK_IS_WINDOW (window));
impl =
GDK_WINDOW_IMPL_X11 (GDK_WINDOW_OBJECT (window)->impl);
gdk_window_compute_parent_pos (impl, &parent_pos);
gdk_window_compute_position (impl, &parent_pos, &impl->position_info);
}
static void
gdk_window_copy_area_scroll (GdkWindow *window,
GdkRectangle *dest_rect,
gint dx,
gint dy)
{
GdkWindowObject *obj = GDK_WINDOW_OBJECT (window);
GList *l;
if (dest_rect->width > 0 && dest_rect->height > 0)
{
GdkGC *gc;
gc = _gdk_drawable_get_scratch_gc (window, TRUE);
gdk_window_queue_translation (window, NULL, dx, dy);
XCopyArea (GDK_WINDOW_XDISPLAY (window),
GDK_WINDOW_XID (window),
GDK_WINDOW_XID (window),
gdk_x11_gc_get_xgc (gc),
dest_rect->x - dx, dest_rect->y - dy,
dest_rect->width, dest_rect->height,
dest_rect->x, dest_rect->y);
}
for (l = obj->children; l; l = l->next)
{
GdkWindow *child = (GdkWindow*) l->data;
GdkWindowObject *child_obj = GDK_WINDOW_OBJECT (child);
gdk_window_move (child, child_obj->x + dx, child_obj->y + dy);
}
}
static void
compute_intermediate_position (GdkXPositionInfo *position_info,
GdkXPositionInfo *new_info,
gint d_xoffset,
gint d_yoffset,
GdkRectangle *new_position)
{
gint new_x0, new_x1, new_y0, new_y1;
/* Wrap d_xoffset, d_yoffset into [-32768,32767] range. For the
* purposes of subwindow movement, it doesn't matter if we are
* off by a factor of 65536, and if we don't do this range
* reduction, we'll end up with invalid widths.
*/
d_xoffset = (gint16)d_xoffset;
d_yoffset = (gint16)d_yoffset;
if (d_xoffset < 0)
{
new_x0 = position_info->x + d_xoffset;
new_x1 = position_info->x + position_info->width;
}
else
{
new_x0 = position_info->x;
new_x1 = position_info->x + new_info->width + d_xoffset;
}
new_position->x = new_x0;
new_position->width = new_x1 - new_x0;
if (d_yoffset < 0)
{
new_y0 = position_info->y + d_yoffset;
new_y1 = position_info->y + position_info->height;
}
else
{
new_y0 = position_info->y;
new_y1 = position_info->y + new_info->height + d_yoffset;
}
new_position->y = new_y0;
new_position->height = new_y1 - new_y0;
}
static void
translate_pos (GdkWindowParentPos *dest, GdkWindowParentPos *src,
GdkWindowObject *obj, GdkXPositionInfo *pos_info,
gboolean set_clip)
{
dest->x = src->x + obj->x;
dest->y = src->y + obj->y;
dest->x11_x = src->x11_x + pos_info->x;
dest->x11_y = src->x11_y + pos_info->y;
if (set_clip)
dest->clip_rect = pos_info->clip_rect;
}
static void
move (GdkWindow *window, GdkXPositionInfo *pos)
{
XMoveWindow (GDK_WINDOW_XDISPLAY (window),
GDK_WINDOW_XID (window), pos->x, pos->y);
}
static void
move_relative (GdkWindow *window, GdkRectangle *rect,
gint dx, gint dy)
{
XMoveWindow (GDK_WINDOW_XDISPLAY (window),
GDK_WINDOW_XID (window),
rect->x + dx, rect->y + dy);
}
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);
}
static void
gdk_window_guffaw_scroll (GdkWindow *window,
gint dx,
gint dy)
{
GdkWindowObject *obj = GDK_WINDOW_OBJECT (window);
GdkWindowImplX11 *impl = GDK_WINDOW_IMPL_X11 (obj->impl);
gint d_xoffset = -dx;
gint d_yoffset = -dy;
GdkRectangle new_position;
GdkXPositionInfo new_info;
GdkWindowParentPos parent_pos;
GList *l;
gdk_window_compute_parent_pos (impl, &parent_pos);
gdk_window_compute_position (impl, &parent_pos, &new_info);
translate_pos (&parent_pos, &parent_pos, obj, &new_info, TRUE);
_gdk_x11_window_tmp_unset_bg (window, FALSE);;
if (dx > 0 || dy > 0)
gdk_window_queue_translation (window, NULL, MAX (dx, 0), MAX (dy, 0));
gdk_window_set_static_gravities (window, TRUE);
compute_intermediate_position (&impl->position_info, &new_info, d_xoffset, d_yoffset,
&new_position);
move_resize (window, &new_position);
for (l = obj->children; l; l = l->next)
{
GdkWindow *child = (GdkWindow*) l->data;
GdkWindowObject *child_obj = GDK_WINDOW_OBJECT (child);
child_obj->x -= d_xoffset;
child_obj->y -= d_yoffset;
gdk_window_premove (child, &parent_pos);
}
move_relative (window, &new_position, -d_xoffset, -d_yoffset);
if (dx < 0 || dy < 0)
gdk_window_queue_translation (window, NULL, MIN (dx, 0), MIN (dy, 0));
move_resize (window, (GdkRectangle *) &impl->position_info);
if (impl->position_info.no_bg)
_gdk_x11_window_tmp_reset_bg (window, FALSE);
impl->position_info = new_info;
g_list_foreach (obj->children, (GFunc) gdk_window_postmove, &parent_pos);
}
void
_gdk_x11_window_scroll (GdkWindow *window,
gint dx,
gint dy)
{
gboolean can_guffaw_scroll = FALSE;
GdkRegion *invalidate_region;
GdkWindowImplX11 *impl;
GdkWindowObject *obj;
GdkRectangle src_rect, dest_rect;
obj = GDK_WINDOW_OBJECT (window);
impl = GDK_WINDOW_IMPL_X11 (obj->impl);
/* Move the current invalid region */
if (obj->update_area)
gdk_region_offset (obj->update_area, dx, dy);
/* impl->position_info.clip_rect isn't meaningful for toplevels */
if (GDK_WINDOW_TYPE (window) == GDK_WINDOW_CHILD)
src_rect = impl->position_info.clip_rect;
else
{
src_rect.x = 0;
src_rect.y = 0;
src_rect.width = impl->width;
src_rect.height = impl->height;
}
invalidate_region = gdk_region_rectangle (&src_rect);
dest_rect = src_rect;
dest_rect.x += dx;
dest_rect.y += dy;
gdk_rectangle_intersect (&dest_rect, &src_rect, &dest_rect);
if (dest_rect.width > 0 && dest_rect.height > 0)
{
GdkRegion *tmp_region;
tmp_region = gdk_region_rectangle (&dest_rect);
gdk_region_subtract (invalidate_region, tmp_region);
gdk_region_destroy (tmp_region);
}
gdk_window_invalidate_region (window, invalidate_region, TRUE);
gdk_region_destroy (invalidate_region);
/* We can guffaw scroll if we are a child window, and the parent
* does not extend beyond our edges. Otherwise, we use XCopyArea, then
* move any children later
*/
if (GDK_WINDOW_TYPE (window) == GDK_WINDOW_CHILD)
{
GdkWindowImplX11 *parent_impl = GDK_WINDOW_IMPL_X11 (obj->parent->impl);
can_guffaw_scroll = ((dx == 0 || (obj->x <= 0 && obj->x + impl->width >= parent_impl->width)) &&
(dy == 0 || (obj->y <= 0 && obj->y + impl->height >= parent_impl->height)));
}
if (!obj->children || !can_guffaw_scroll)
gdk_window_copy_area_scroll (window, &dest_rect, dx, dy);
else
gdk_window_guffaw_scroll (window, dx, dy);
}
void
_gdk_x11_window_move_region (GdkWindow *window,
const GdkRegion *region,
gint dx,
gint dy)
{
GdkWindowImplX11 *impl;
GdkWindowObject *private;
GdkRegion *window_clip;
GdkRegion *src_region;
GdkRegion *brought_in;
GdkRegion *dest_region;
GdkRegion *moving_invalid_region;
GdkRectangle dest_extents;
GdkGC *gc;
private = GDK_WINDOW_OBJECT (window);
impl = GDK_WINDOW_IMPL_X11 (private->impl);
window_clip = gdk_region_rectangle (&impl->position_info.clip_rect);
/* compute source regions */
src_region = gdk_region_copy (region);
brought_in = gdk_region_copy (region);
gdk_region_intersect (src_region, window_clip);
gdk_region_subtract (brought_in, src_region);
gdk_region_offset (brought_in, dx, dy);
/* compute destination regions */
dest_region = gdk_region_copy (src_region);
gdk_region_offset (dest_region, dx, dy);
gdk_region_intersect (dest_region, window_clip);
gdk_region_get_clipbox (dest_region, &dest_extents);
gdk_region_destroy (window_clip);
/* calculating moving part of current invalid area */
moving_invalid_region = NULL;
if (private->update_area)
{
moving_invalid_region = gdk_region_copy (private->update_area);
gdk_region_intersect (moving_invalid_region, src_region);
gdk_region_offset (moving_invalid_region, dx, dy);
}
/* invalidate all of the src region */
gdk_window_invalidate_region (window, src_region, FALSE);
/* un-invalidate destination region */
if (private->update_area)
gdk_region_subtract (private->update_area, dest_region);
/* invalidate moving parts of existing update area */
if (moving_invalid_region)
{
gdk_window_invalidate_region (window, moving_invalid_region, FALSE);
gdk_region_destroy (moving_invalid_region);
}
/* invalidate area brought in from off-screen */
gdk_window_invalidate_region (window, brought_in, FALSE);
gdk_region_destroy (brought_in);
/* Actually do the moving */
gdk_window_queue_translation (window, src_region, dx, dy);
gc = _gdk_drawable_get_scratch_gc (window, TRUE);
gdk_gc_set_clip_region (gc, dest_region);
XCopyArea (GDK_WINDOW_XDISPLAY (window),
GDK_WINDOW_XID (window),
GDK_WINDOW_XID (window),
GDK_GC_XGC (gc),
dest_extents.x - dx, dest_extents.y - dy,
dest_extents.width, dest_extents.height,
dest_extents.x, dest_extents.y);
/* Unset clip region of cached GC */
gdk_gc_set_clip_region (gc, NULL);
gdk_region_destroy (src_region);
gdk_region_destroy (dest_region);
}
static void
reset_backgrounds (GdkWindow *window)
{
GdkWindowObject *obj = (GdkWindowObject *)window;
_gdk_x11_window_tmp_reset_bg (window, FALSE);
if (obj->parent)
_gdk_x11_window_tmp_reset_bg ((GdkWindow *)obj->parent, FALSE);
}
static void
map_if_needed (GdkWindow *window, GdkXPositionInfo *pos_info)
{
GdkWindowObject *obj = (GdkWindowObject *) window;
GdkWindowImplX11 *impl = GDK_WINDOW_IMPL_X11 (obj->impl);
if (!impl->position_info.mapped && pos_info->mapped && GDK_WINDOW_IS_MAPPED (obj))
XMapWindow (GDK_DRAWABLE_XDISPLAY (window), GDK_DRAWABLE_XID (window));
}
static void
unmap_if_needed (GdkWindow *window, GdkXPositionInfo *pos_info)
{
GdkWindowObject *obj = (GdkWindowObject *) window;
GdkWindowImplX11 *impl = GDK_WINDOW_IMPL_X11 (obj->impl);
if (impl->position_info.mapped && !pos_info->mapped)
XUnmapWindow (GDK_DRAWABLE_XDISPLAY (window), GDK_DRAWABLE_XID (window));
}
void
_gdk_window_move_resize_child (GdkWindow *window,
gint x,
gint y,
gint width,
gint height)
{
GdkWindowImplX11 *impl;
GdkWindowObject *obj;
GdkXPositionInfo new_info;
GdkWindowParentPos parent_pos;
gint d_xoffset, d_yoffset;
gint dx, dy;
gboolean is_move;
gboolean is_resize;
GdkRectangle old_pos;
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);
dx = x - obj->x;
dy = y - obj->y;
is_move = dx != 0 || dy != 0;
is_resize = impl->width != width || impl->height != height;
if (!is_move && !is_resize)
return;
old_pos.x = obj->x;
old_pos.y = obj->y;
old_pos.width = impl->width;
old_pos.height = impl->height;
obj->x = x;
obj->y = y;
impl->width = width;
impl->height = height;
gdk_window_compute_parent_pos (impl, &parent_pos);
gdk_window_compute_position (impl, &parent_pos, &new_info);
gdk_window_clip_changed (window, &impl->position_info.clip_rect, &new_info.clip_rect);
translate_pos (&parent_pos, &parent_pos, obj, &new_info, TRUE);
d_xoffset = new_info.x_offset - impl->position_info.x_offset;
d_yoffset = new_info.y_offset - impl->position_info.y_offset;
if (d_xoffset != 0 || d_yoffset != 0)
{
GdkRectangle new_position;
gdk_window_set_static_gravities (window, TRUE);
if (d_xoffset < 0 || d_yoffset < 0)
gdk_window_queue_translation (window, NULL, MIN (d_xoffset, 0), MIN (d_yoffset, 0));
compute_intermediate_position (&impl->position_info, &new_info, d_xoffset, d_yoffset,
&new_position);
move_resize (window, &new_position);
g_list_foreach (obj->children, (GFunc) gdk_window_premove, &parent_pos);
move_relative (window, &new_position, dx, dy);
if (d_xoffset > 0 || d_yoffset > 0)
gdk_window_queue_translation (window, NULL, MAX (d_xoffset, 0), MAX (d_yoffset, 0));
move_resize (window, (GdkRectangle *) &new_info);
reset_backgrounds (window);
map_if_needed (window, &new_info);
impl->position_info = new_info;
g_list_foreach (obj->children, (GFunc) gdk_window_postmove, &parent_pos);
}
else
{
if (is_move && is_resize)
gdk_window_set_static_gravities (window, FALSE);
unmap_if_needed (window, &new_info);
g_list_foreach (obj->children, (GFunc) gdk_window_premove, &parent_pos);
if (is_resize)
move_resize (window, (GdkRectangle *) &new_info);
else
move (window, &new_info);
g_list_foreach (obj->children, (GFunc) gdk_window_postmove, &parent_pos);
reset_backgrounds (window);
map_if_needed (window, &new_info);
impl->position_info = new_info;
}
if (GDK_WINDOW_IS_MAPPED (obj) && obj->parent && !obj->input_only)
gdk_window_invalidate_rect ((GdkWindow *)obj->parent, &old_pos, FALSE);
}
static void
gdk_window_compute_position (GdkWindowImplX11 *window,
GdkWindowParentPos *parent_pos,
GdkXPositionInfo *info)
{
GdkWindowObject *wrapper;
int parent_x_offset;
int parent_y_offset;
g_return_if_fail (GDK_IS_WINDOW_IMPL_X11 (window));
wrapper = GDK_WINDOW_OBJECT (GDK_DRAWABLE_IMPL_X11 (window)->wrapper);
info->big = FALSE;
if (window->width <= 32767)
{
info->width = window->width;
info->x = parent_pos->x + wrapper->x - parent_pos->x11_x;
}
else
{
info->big = TRUE;
info->width = 32767;
if (parent_pos->x + wrapper->x < -16384)
{
if (parent_pos->x + wrapper->x + window->width < 16384)
info->x = parent_pos->x + wrapper->x + window->width - info->width - parent_pos->x11_x;
else
info->x = -16384 - parent_pos->x11_x;
}
else
info->x = parent_pos->x + wrapper->x - parent_pos->x11_x;
}
if (window->height <= 32767)
{
info->height = window->height;
info->y = parent_pos->y + wrapper->y - parent_pos->x11_y;
}
else
{
info->big = TRUE;
info->height = 32767;
if (parent_pos->y + wrapper->y < -16384)
{
if (parent_pos->y + wrapper->y + window->height < 16384)
info->y = parent_pos->y + wrapper->y + window->height - info->height - parent_pos->x11_y;
else
info->y = -16384 - parent_pos->x11_y;
}
else
info->y = parent_pos->y + wrapper->y - parent_pos->x11_y;
}
parent_x_offset = parent_pos->x11_x - parent_pos->x;
parent_y_offset = parent_pos->x11_y - parent_pos->y;
info->x_offset = parent_x_offset + info->x - wrapper->x;
info->y_offset = parent_y_offset + info->y - wrapper->y;
/* We don't considering the clipping of toplevel windows and their immediate children
* by their parents, and simply always map those windows.
*/
if (parent_pos->clip_rect.width == G_MAXINT)
info->mapped = TRUE;
/* Check if the window would wrap around into the visible space in either direction */
else if (info->x + parent_x_offset < parent_pos->clip_rect.x + parent_pos->clip_rect.width - 65536 ||
info->x + info->width + parent_x_offset > parent_pos->clip_rect.x + 65536 ||
info->y + parent_y_offset < parent_pos->clip_rect.y + parent_pos->clip_rect.height - 65536 ||
info->y + info->height + parent_y_offset > parent_pos->clip_rect.y + 65536)
info->mapped = FALSE;
else
info->mapped = TRUE;
info->no_bg = FALSE;
if (GDK_WINDOW_TYPE (wrapper) == GDK_WINDOW_CHILD)
{
info->clip_rect.x = wrapper->x;
info->clip_rect.y = wrapper->y;
info->clip_rect.width = window->width;
info->clip_rect.height = window->height;
gdk_rectangle_intersect (&info->clip_rect, &parent_pos->clip_rect, &info->clip_rect);
info->clip_rect.x -= wrapper->x;
info->clip_rect.y -= wrapper->y;
}
else
{
info->clip_rect.x = 0;
info->clip_rect.y = 0;
info->clip_rect.width = G_MAXINT;
info->clip_rect.height = G_MAXINT;
}
}
static void
gdk_window_compute_parent_pos (GdkWindowImplX11 *window,
GdkWindowParentPos *parent_pos)
{
GdkWindowObject *wrapper;
GdkWindowObject *parent;
GdkRectangle tmp_clip;
int clip_xoffset = 0;
int clip_yoffset = 0;
g_return_if_fail (GDK_IS_WINDOW_IMPL_X11 (window));
wrapper =
GDK_WINDOW_OBJECT (GDK_DRAWABLE_IMPL_X11 (window)->wrapper);
parent_pos->x = 0;
parent_pos->y = 0;
parent_pos->x11_x = 0;
parent_pos->x11_y = 0;
/* We take a simple approach here and simply consider toplevel
* windows not to clip their children on the right/bottom, since the
* size of toplevel windows is not directly under our
* control. Clipping only really matters when scrolling and
* generally we aren't going to be moving the immediate child of a
* toplevel beyond the bounds of that toplevel.
*
* We could go ahead and recompute the clips of toplevel windows and
* their descendents when we receive size notification, but it would
* probably not be an improvement in most cases.
*/
parent_pos->clip_rect.x = 0;
parent_pos->clip_rect.y = 0;
parent_pos->clip_rect.width = G_MAXINT;
parent_pos->clip_rect.height = G_MAXINT;
parent = (GdkWindowObject *)wrapper->parent;
while (parent && parent->window_type == GDK_WINDOW_CHILD)
{
GdkWindowImplX11 *impl = GDK_WINDOW_IMPL_X11 (parent->impl);
tmp_clip.x = - clip_xoffset;
tmp_clip.y = - clip_yoffset;
tmp_clip.width = impl->width;
tmp_clip.height = impl->height;
gdk_rectangle_intersect (&parent_pos->clip_rect, &tmp_clip, &parent_pos->clip_rect);
translate_pos (parent_pos, parent_pos, parent,
&impl->position_info, FALSE);
clip_xoffset += parent->x;
clip_yoffset += parent->y;
parent = (GdkWindowObject *)parent->parent;
}
}
static void
gdk_window_premove (GdkWindow *window,
GdkWindowParentPos *parent_pos)
{
GdkWindowImplX11 *impl;
GdkWindowObject *obj;
GdkXPositionInfo new_info;
gint d_xoffset, d_yoffset;
GdkWindowParentPos this_pos;
obj = (GdkWindowObject *) window;
impl = GDK_WINDOW_IMPL_X11 (obj->impl);
gdk_window_compute_position (impl, parent_pos, &new_info);
gdk_window_clip_changed (window, &impl->position_info.clip_rect, &new_info.clip_rect);
translate_pos (&this_pos, parent_pos, obj, &new_info, TRUE);
unmap_if_needed (window, &new_info);
d_xoffset = new_info.x_offset - impl->position_info.x_offset;
d_yoffset = new_info.y_offset - impl->position_info.y_offset;
if (d_xoffset != 0 || d_yoffset != 0)
{
GdkRectangle new_position;
if (d_xoffset < 0 || d_yoffset < 0)
gdk_window_queue_translation (window, NULL, MIN (d_xoffset, 0), MIN (d_yoffset, 0));
compute_intermediate_position (&impl->position_info, &new_info, d_xoffset, d_yoffset,
&new_position);
move_resize (window, &new_position);
}
g_list_foreach (obj->children, (GFunc) gdk_window_premove, &this_pos);
}
static void
gdk_window_postmove (GdkWindow *window,
GdkWindowParentPos *parent_pos)
{
GdkWindowImplX11 *impl;
GdkWindowObject *obj;
GdkXPositionInfo new_info;
gint d_xoffset, d_yoffset;
GdkWindowParentPos this_pos;
obj = (GdkWindowObject *) window;
impl = GDK_WINDOW_IMPL_X11 (obj->impl);
gdk_window_compute_position (impl, parent_pos, &new_info);
translate_pos (&this_pos, parent_pos, obj, &new_info, TRUE);
d_xoffset = new_info.x_offset - impl->position_info.x_offset;
d_yoffset = new_info.y_offset - impl->position_info.y_offset;
if (d_xoffset != 0 || d_yoffset != 0)
{
if (d_xoffset > 0 || d_yoffset > 0)
gdk_window_queue_translation (window, NULL, MAX (d_xoffset, 0), MAX (d_yoffset, 0));
move_resize (window, (GdkRectangle *) &new_info);
}
map_if_needed (window, &new_info);
reset_backgrounds (window);
impl->position_info = new_info;
g_list_foreach (obj->children, (GFunc) gdk_window_postmove, &this_pos);
}
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);
}
static void
gdk_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_windowing_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);
GdkRegion *clip_region;
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;
}
}
clip_region = gdk_region_rectangle (&impl->position_info.clip_rect);
gdk_region_intersect (invalidate_region, clip_region);
if (!gdk_region_empty (invalidate_region))
gdk_window_invalidate_region (window, invalidate_region, FALSE);
gdk_region_destroy (invalidate_region);
gdk_region_destroy (clip_region);
}
static void
gdk_window_clip_changed (GdkWindow *window, GdkRectangle *old_clip, GdkRectangle *new_clip)
{
GdkWindowImplX11 *impl;
GdkWindowObject *obj;
GdkRegion *old_clip_region;
GdkRegion *new_clip_region;
if (((GdkWindowObject *)window)->input_only)
return;
obj = (GdkWindowObject *) window;
impl = GDK_WINDOW_IMPL_X11 (obj->impl);
old_clip_region = gdk_region_rectangle (old_clip);
new_clip_region = gdk_region_rectangle (new_clip);
/* We need to update this here because gdk_window_invalidate_region makes
* use if it (through gdk_drawable_get_visible_region
*/
impl->position_info.clip_rect = *new_clip;
/* Trim invalid region of window to new clip rectangle
*/
if (obj->update_area)
gdk_region_intersect (obj->update_area, new_clip_region);
/* Invalidate newly exposed portion of window
*/
gdk_region_subtract (new_clip_region, old_clip_region);
if (!gdk_region_empty (new_clip_region))
{
_gdk_x11_window_tmp_unset_bg (window, FALSE);;
gdk_window_invalidate_region (window, new_clip_region, FALSE);
}
if (obj->parent)
_gdk_x11_window_tmp_unset_bg ((GdkWindow *)obj->parent, FALSE);
gdk_region_destroy (new_clip_region);
gdk_region_destroy (old_clip_region);
}
#define __GDK_GEOMETRY_X11_C__
#include "gdkaliasdef.c"