pub type ScreenCoord = i32;
pub type ScreenPoint = Point2D;
pub type ScreenVector = Vector2D;
pub type ScreenRect = Rect;
pub type ScreenSize = Size2D;
pub type GrCoord = f32;
pub type GrPoint = Point2D;
pub type GrVector = Vector2D;
pub type GrRect = Rect;
pub type GrSize = Size2D;