package util

type Set map[color.Color]struct{}

func PaletteFromImage(img image.Image) color.Palette {
	m := Set{}
	for y := 0; y < img.Bounds().Dy(); y++ {
		for x := 0; x < img.Bounds().Dx(); x++ {
			m[img.At] = struct{}{}
		}
	}
	return func(m Set)(p color.Palette){
		for k := range m {
			p = append(p, k)
		}
	}(m)
}

func ImageToPaletted(img image.Image) (image.Paletted) {
	p := image.NewPaletted(img.Bounds(), PaletteFromImage(img))

	for y := 0; y < img.Bounds().Dy(); y++ {
		for x := 0; x < img.Bounds().Dx(); x++ {
			p.Set(x, y, img.At(x,y))
		}
	}
	return p
}