Move icon generation into dedicated files

icons/idicons.go

@@ -0,0 +1,54 @@
+package icons
+
+import (
+	"image"
+	"image/color"
+	"strings"
+)
+
+type IdIconGenerator struct {
+}
+
+func (generator *IdIconGenerator) GenIcon(id string, size int, f func([16]byte) color.RGBA) *image.NRGBA {
+	id = strings.ToLower(id)
+	blocks := 5
+	if size > 512 {
+		size = 512
+	}
+
+	hash := HashBytes(id)
+	data := make([]bool, blocks*blocks)
+	for i := 0; i < len(hash)-1; i++ {
+		data[i] = hash[i]%2 != hash[i+1]%2
+	}
+	return drawImage(mirrorData(data, blocks), blocks, size, f(hash))
+}
+
+func ColorV1(hash [16]byte) color.RGBA {
+	r := 32 + (hash[0]%16)/2<<4
+	g := 32 + (hash[2]%16)/2<<4
+	b := 32 + (hash[len(hash)-1]%16)/2<<4
+
+	if r > g && r > b {
+		r += 48
+	} else if g > r && g > b {
+		g += 48
+	} else if b > r && b > g {
+		b += 48
+	}
+	return color.RGBA{r, g, b, 255}
+}
+
+func ColorV2(hash [16]byte) color.RGBA {
+	var palette = []color.RGBA{
+		{0x3c, 0x38, 0x36, 0xff},
+		{0xcc, 0x24, 0x1d, 0xff},
+		{0x98, 0x97, 0x1a, 0xff},
+		{0xd7, 0x99, 0x21, 0xff},
+		{0x45, 0x85, 0x88, 0xff},
+		{0xb1, 0x62, 0x86, 0xff},
+		{0x68, 0x9d, 0x6a, 0xff},
+		{0xa8, 0x99, 0x84, 0xff},
+	}
+	return palette[hash[15]%8]
+}