Function RGBAImageApproxEqual

util/util.go:107–124

RGBAImageApproxEqual returns true if all pixel channel values in images a and b differ by at most the given tolerance, or false otherwise.

(a, b *image.RGBA, tolerance int)

// RGBAImageApproxEqual returns true if all pixel channel values in images a and b
// differ by at most the given tolerance, or false otherwise.
func RGBAImageApproxEqual(a, b *image.RGBA, tolerance int) bool {
	if !a.Rect.Eq(b.Rect) {
		return false
	}

	for y := 0; y < a.Bounds().Dy(); y++ {
		for x := 0; x < a.Bounds().Dx(); x++ {
			pos := y*a.Stride + x*4
			for c := 0; c < 4; c++ {
				d := int(a.Pix[pos+c]) - int(b.Pix[pos+c])
				if d < -tolerance || d > tolerance {
					return false
				}
			}
		}
	}
	return true
}