func (c *ColorM) Scale(r, g, b, a float64) {
	c.impl = c.impl.Scale(float32(r), float32(g), float32(b), float32(a))
}
func (c *ColorM) Scale(r, g, b, a float64) {
	c.impl = c.impl.Scale(float32(r), float32(g), float32(b), float32(a))
}
func ( c * ColorM ) Scale ( r , g , b , a float64 ) { c . impl = c . impl . Scale ( float32 ( r ) , float32 ( g ) , float32 ( b ) , float32 ( a ) ) }
// Scale scales the matrix by (r, g, b, a).
Scale scales the matrix by ( r g b a ) .