cmd

cmd/negate/mixed.go

@@ -0,0 +1,70 @@
+package main
+
+import (
+	"image"
+	"image/color"
+	"image/png"
+	"math/rand"
+	"os"
+)
+
+type MixedNegation struct {
+	src     image.Image
+	counter int
+}
+
+func toRGBA(c color.Color) color.RGBA {
+	r, g, b, a := c.RGBA()
+	return color.RGBA{
+		R: uint8(r >> 8),
+		G: uint8(g >> 8),
+		B: uint8(b >> 8),
+		A: uint8(a >> 8),
+	}
+}
+
+func negateRGBA(c color.RGBA) color.RGBA {
+	c.R = 255 - c.R
+	c.G = 255 - c.G
+	c.B = 255 - c.B
+	return c
+}
+
+func Negate(c color.Color) color.Color {
+	return negateRGBA(toRGBA(c))
+}
+
+func randomBool() bool {
+	return rand.Intn(3) == 0
+}
+
+func (mn MixedNegation) ColorModel() color.Model { return mn.src.ColorModel() }
+func (mn MixedNegation) Bounds() image.Rectangle { return mn.src.Bounds() }
+func (mn *MixedNegation) At(x, y int) color.Color {
+	if (x%1 != 0) && (y%8 != 0) {
+		if randomBool() {
+			return Negate(mn.src.At(x, y))
+		}
+
+	}
+	return mn.src.At(x, y)
+}
+
+func pixelCount(img image.Image) int {
+	return img.Bounds().Dx() * img.Bounds().Dy()
+}
+
+func main() {
+	img, err := png.Decode(os.Stdin)
+	if err != nil {
+		panic(err)
+	}
+
+	n := pixelCount(img)
+	println(n)
+
+	err = png.Encode(os.Stdout, &MixedNegation{src: img, counter: n})
+	if err != nil {
+		panic(err)
+	}
+}