if (l->surface.grad == RR_SURFACE_PARENTREL) {
g_assert (l->surface.parent);
g_assert (l->surface.parent->w);
sw = l->surface.parent->w;
if (l->surface.grad == RR_SURFACE_PARENTREL) {
g_assert (l->surface.parent);
g_assert (l->surface.parent->w);
sw = l->surface.parent->w;