MetaWaylandPointerConstraint: Fix effective region calculation

The when surface->input_region is NULL, it should be interpreted as the
whole surface region. If not, the effective input region is the
intersection of the buffer region and the input region set by
wl_surface.set_input_region. Add
meta_wayland_surface_calculate_input_region() that does this
calculation.

https://bugzilla.gnome.org/show_bug.cgi?id=762661

src/wayland/meta-wayland-pointer-constraints.c

@@ -237,7 +237,7 @@ is_within_constraint_region (MetaWaylandPointerConstraint *constraint,
   gboolean is_within;
 
   region = meta_wayland_pointer_constraint_calculate_effective_region (constraint);
-  is_within = cairo_region_contains_point (constraint->region,
+  is_within = cairo_region_contains_point (region,
                                            wl_fixed_to_int (sx),
                                            wl_fixed_to_int (sy));
   cairo_region_destroy (region);
@@ -330,7 +330,7 @@ meta_wayland_pointer_constraint_calculate_effective_region (MetaWaylandPointerCo
 {
   cairo_region_t *region;
 
-  region = cairo_region_copy (constraint->surface->input_region);
+  region = meta_wayland_surface_calculate_input_region (constraint->surface);
   cairo_region_intersect (region, constraint->region);
 
   return region;

src/wayland/meta-wayland-surface.c

@@ -2754,3 +2754,26 @@ meta_wayland_surface_role_subsurface_class_init (MetaWaylandSurfaceRoleSubsurfac
   surface_role_class->commit = subsurface_surface_commit;
   surface_role_class->is_on_output = actor_surface_is_on_output;
 }
+
+cairo_region_t *
+meta_wayland_surface_calculate_input_region (MetaWaylandSurface *surface)
+{
+  cairo_region_t *region;
+  cairo_rectangle_int_t buffer_rect;
+  CoglTexture *texture;
+
+  if (!surface->buffer)
+    return NULL;
+
+  texture = surface->buffer->texture;
+  buffer_rect = (cairo_rectangle_int_t) {
+    .width = cogl_texture_get_width (texture) / surface->scale,
+    .height = cogl_texture_get_height (texture) / surface->scale,
+  };
+  region = cairo_region_create_rectangle (&buffer_rect);
+
+  if (surface->input_region)
+    cairo_region_intersect (region, surface->input_region);
+
+  return region;
+}

src/wayland/meta-wayland-surface.h

@@ -287,4 +287,6 @@ void                meta_wayland_surface_get_absolute_coordinates (MetaWaylandSu
 
 MetaWaylandSurface * meta_wayland_surface_role_get_surface (MetaWaylandSurfaceRole *role);
 
+cairo_region_t *    meta_wayland_surface_calculate_input_region (MetaWaylandSurface *surface);
+
 #endif