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backends/native: Ensure pointer is onscreen in input thread

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It's slightly racy to have the main thread update the views and warp
the pointer, since the input thread may not be aware yet of the new
viewport layout.

Make the input thread clamp the pointer so it remains onscreen
instead, when the new viewports are obtained.

Closes: https://gitlab.gnome.org/GNOME/mutter/-/issues/64
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2237>
This commit is contained in:
Carlos Garnacho 2022-01-14 20:29:45 +01:00 committed by Marge Bot
parent 75e220a1c1
commit 70e44c281c
1 changed files with 55 additions and 0 deletions
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55
src/backends/native/meta-seat-impl.c
View File

@ -3514,6 +3514,59 @@ meta_seat_impl_set_pointer_constraint (MetaSeatImpl *seat_impl,
g_object_unref (task);
}
static void
ensure_pointer_onscreen (MetaSeatImpl *seat_impl)
{
int i, candidate = -1;
int nearest_monitor_x, nearest_monitor_y, min_distance = G_MAXINT;
cairo_rectangle_int_t monitor_rect;
graphene_point_t coords;
if (!meta_seat_impl_query_state (seat_impl,
seat_impl->core_pointer, NULL,
&coords, NULL))
return;
/* Pointer is in a view */
if (meta_viewport_info_get_view_at (seat_impl->viewports,
coords.x, coords.y) >= 0)
return;
/* Find nearest view */
for (i = 0; i < meta_viewport_info_get_num_views (seat_impl->viewports); i++)
{
meta_viewport_info_get_view_info (seat_impl->viewports, i,
&monitor_rect, NULL);
nearest_monitor_x = MIN (ABS (coords.x - monitor_rect.x),
ABS (coords.x -
monitor_rect.x + monitor_rect.width));
nearest_monitor_y = MIN (ABS (coords.y - monitor_rect.y),
ABS (coords.y -
monitor_rect.y + monitor_rect.height));
if (nearest_monitor_x < min_distance ||
nearest_monitor_y < min_distance)
{
min_distance = MIN (nearest_monitor_x, nearest_monitor_y);
candidate = i;
}
}
if (candidate < 0)
return;
/* Calculate new coordinates on nearest view */
meta_viewport_info_get_view_info (seat_impl->viewports,
candidate,
&monitor_rect, NULL);
coords.x = CLAMP (coords.x, monitor_rect.x,
monitor_rect.x + monitor_rect.width - 1);
coords.y = CLAMP (coords.y, monitor_rect.y,
monitor_rect.y + monitor_rect.height - 1);
notify_absolute_motion_in_impl (seat_impl->core_pointer, 0,
coords.x, coords.y, NULL);
}
static gboolean
set_viewports (GTask *task)
{
@ -3523,6 +3576,8 @@ set_viewports (GTask *task)
g_set_object (&seat_impl->viewports, viewports);
g_task_return_boolean (task, TRUE);
ensure_pointer_onscreen (seat_impl);
return G_SOURCE_REMOVE;
}