VIDOSDxB_BOTRIGHT_Y
val = VIDOSDxB_BOTRIGHT_X(last_x) | VIDOSDxB_BOTRIGHT_Y(last_y);
val = VIDOSDxB_BOTRIGHT_X(last_x) | VIDOSDxB_BOTRIGHT_Y(last_y) |
VIDOSDxB_BOTRIGHT_Y(var->yres - 1) |