to save up a progress

pkg/mirror/mirror.go

@@ -0,0 +1,22 @@
+package mirror
+
+import (
+	"image"
+	"image/color"
+)
+
+type Mirror struct {
+	image.Image
+}
+
+func (m Mirror) ColorModel() color.Model {
+	return m.Image.ColorModel()
+}
+
+func (m Mirror) Bounds() image.Rectangle {
+	return m.Image.Bounds()
+}
+
+func (m Mirror) At(x, y int) color.Color {
+	return m.Image.At(m.Bounds().Dx()-x, y)
+}