goutil/image/color/color.go

package ucolor

import "image/color"

// Transparent returns whether or not a color has transparency.
func Transparent (c color.Color) bool {
	_, _, _, a := c.RGBA()
	return a != 0xFFFF
}

// ToRGBA converts any color to a color.RGBA value.
func ToRGBA (c color.Color) color.RGBA {
	r, g, b, a := c.RGBA()
	return color.RGBA {
		uint8(r >> 8),
		uint8(g >> 8),
		uint8(b >> 8),
		uint8(a >> 8),
	}
}