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x11: Avoid X error traps within server grabs

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gdk_x11_device_xi2_window_at_position() may attempt to push/pop
a few error trap pairs while traversing the window tree. Move it
outside the server grab, and around the multiple XIQueryPointer
calls we may do here.

https://bugzilla.gnome.org/show_bug.cgi?id=751739
This commit is contained in:
Carlos Garnacho 2015-06-30 19:04:13 +02:00 committed by Matthias Clasen
parent ef93c714f8
commit 0f3995a446
1 changed files with 43 additions and 30 deletions
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73
gdk/x11/gdkdevice-xi2.c
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@ -499,10 +499,13 @@ gdk_x11_device_xi2_window_at_position (GdkDevice *device,
XIButtonState button_state = { 0 };
XIModifierState mod_state;
XIGroupState group_state;
Bool retval;
display = gdk_device_get_display (device);
screen = gdk_display_get_default_screen (display);
gdk_x11_display_error_trap_push (display);
/* This function really only works if the mouse pointer is held still
* during its operation. If it moves from one leaf window to another
* than we'll end up with inaccurate values for win_x, win_y
@ -549,18 +552,18 @@ gdk_x11_device_xi2_window_at_position (GdkDevice *device,
/* Free previous button mask, if any */
g_free (button_state.mask);
gdk_x11_display_error_trap_push (display);
XIQueryPointer (xdisplay,
device_xi2->device_id,
xwindow,
&root, &child,
&xroot_x, &xroot_y,
&xwin_x, &xwin_y,
&button_state,
&mod_state,
&group_state);
if (gdk_x11_display_error_trap_pop (display))
retval = XIQueryPointer (xdisplay,
device_xi2->device_id,
xwindow,
&root, &child,
&xroot_x, &xroot_y,
&xwin_x, &xwin_y,
&button_state,
&mod_state,
&group_state);
if (!retval)
continue;
if (child != None)
{
pointer_window = child;
@ -609,17 +612,16 @@ gdk_x11_device_xi2_window_at_position (GdkDevice *device,
last = xwindow;
free (button_state.mask);
gdk_x11_display_error_trap_push (display);
XIQueryPointer (xdisplay,
device_xi2->device_id,
xwindow,
&root, &xwindow,
&xroot_x, &xroot_y,
&xwin_x, &xwin_y,
&button_state,
&mod_state,
&group_state);
if (gdk_x11_display_error_trap_pop (display))
retval = XIQueryPointer (xdisplay,
device_xi2->device_id,
xwindow,
&root, &xwindow,
&xroot_x, &xroot_y,
&xwin_x, &xwin_y,
&button_state,
&mod_state,
&group_state);
if (!retval)
break;
if (get_toplevel && last != root &&
@ -633,10 +635,25 @@ gdk_x11_device_xi2_window_at_position (GdkDevice *device,
gdk_x11_display_ungrab (display);
window = gdk_x11_window_lookup_for_display (display, last);
impl = NULL;
if (window)
impl = GDK_WINDOW_IMPL_X11 (window->impl);
if (gdk_x11_display_error_trap_pop (display) == 0)
{
window = gdk_x11_window_lookup_for_display (display, last);
impl = NULL;
if (window)
impl = GDK_WINDOW_IMPL_X11 (window->impl);
if (mask)
*mask = _gdk_x11_device_xi2_translate_state (&mod_state, &button_state, &group_state);
free (button_state.mask);
}
else
{
window = NULL;
if (mask)
*mask = 0;
}
if (win_x)
*win_x = (window) ? (xwin_x / impl->window_scale) : -1;
@ -644,10 +661,6 @@ gdk_x11_device_xi2_window_at_position (GdkDevice *device,
if (win_y)
*win_y = (window) ? (xwin_y / impl->window_scale) : -1;
if (mask)
*mask = _gdk_x11_device_xi2_translate_state (&mod_state, &button_state, &group_state);
free (button_state.mask);
return window;
}