package dithering

import (
	"image"
	"image/color"
)

type grid struct {
	color.Gray
}

func (_ grid) ColorModel() color.Model {
	return color.RGBAModel
}

func (_ grid) Bounds() image.Rectangle {
	return image.Rect(0, 0, 8, 8)
}

func (g grid) At(x, y int) color.Color {
	step := int(64 / (g.Gray.Y / 4))
	if (y*8+x)%step == 0 {
		return color.Black
	}
	return color.White
}

type uniformGrid struct {
	image.Image
	image.Rectangle
}

func (g uniformGrid) ColorModel() color.Model {
	return g.Image.ColorModel()
}

func (g uniformGrid) Bounds() image.Rectangle {
	return g.Rectangle
}

func (g uniformGrid) At(x, y int) color.Color {
	return color.Color(nil)
}