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implement compression of motion events (drop all but the most recently

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2003-01-11  Havoc Pennington  <hp@pobox.com>

	* src/window.c (meta_window_handle_mouse_grab_op_event): implement
	compression of motion events (drop all but the most recently
	received), guessing at fixes for #103009
This commit is contained in:
Havoc Pennington 2003-01-11 19:32:12 +00:00 committed by Havoc Pennington
parent 339a86150b
commit 8f7eda43a8
2 changed files with 79 additions and 7 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
2003-01-11 Havoc Pennington <hp@pobox.com>
* src/window.c (meta_window_handle_mouse_grab_op_event): implement
compression of motion events (drop all but the most recently
received), guessing at fixes for #103009
2003-01-11 Havoc Pennington <hp@pobox.com>
* configure.in: add ability to --disable-shape

80
src/window.c
View File

@ -6309,6 +6309,66 @@ update_resize (MetaWindow *window,
clear_moveresize_time (window);
}
typedef struct
{
XEvent prev_event;
gboolean done;
int count;
} CompressEventData;
static Bool
compress_event_predicate (Display *display,
XEvent *xevent,
XPointer arg)
{
CompressEventData *ced = (void*) arg;
if (ced->done)
return False;
else if (ced->prev_event.type == xevent->type &&
ced->prev_event.xany.window == xevent->xany.window)
{
ced->count += 1;
return True;
}
else if (xevent->type != Expose &&
xevent->type != ConfigureNotify &&
xevent->type != PropertyNotify)
{
/* Don't compress across most unrelated events, just to be safe */
ced->done = TRUE;
return False;
}
else
return False;
}
static void
maybe_replace_with_newer_event (MetaWindow *window,
XEvent *event)
{
XEvent new_event;
CompressEventData ced;
/* Chew up all events of the same type on the same window */
ced.count = 0;
ced.done = FALSE;
ced.prev_event = *event;
while (XCheckIfEvent (window->display->xdisplay,
&new_event,
compress_event_predicate,
(void*) &ced.prev_event))
ced.prev_event = new_event;
if (ced.count > 0)
{
meta_topic (META_DEBUG_RESIZING,
"Compressed %d motion events\n", ced.count);
*event = ced.prev_event;
}
}
void
meta_window_handle_mouse_grab_op_event (MetaWindow *window,
XEvent *event)
@ -6378,17 +6438,23 @@ meta_window_handle_mouse_grab_op_event (MetaWindow *window,
if (meta_grab_op_is_moving (window->display->grab_op))
{
if (event->xmotion.root == window->screen->xroot)
update_move (window,
event->xmotion.state,
event->xmotion.x_root,
event->xmotion.y_root);
{
maybe_replace_with_newer_event (window, event);
update_move (window,
event->xmotion.state,
event->xmotion.x_root,
event->xmotion.y_root);
}
}
else if (meta_grab_op_is_resizing (window->display->grab_op))
{
if (event->xmotion.root == window->screen->xroot)
update_resize (window,
event->xmotion.x_root,
event->xmotion.y_root);
{
maybe_replace_with_newer_event (window, event);
update_resize (window,
event->xmotion.x_root,
event->xmotion.y_root);
}
}
break;