1 files changed, 62 insertions(+), 2 deletions(-)

M avatar.go

@@ 29,9 29,9 @@ import (
 	"strconv"
 	"strings"
 
+	"github.com/cespare/xxhash/v2"
 	"github.com/gorilla/mux"
 	adorable "github.com/ipsn/go-adorable"
-	"github.com/aofei/cameron"
 )
 
 var avatarcolors = [4][4]byte{


@@ 77,7 77,7 @@ func genAvatara(name string) []byte {
 
 func genAvatar(name string) []byte {
 	img := bytes.Buffer{}
-	png.Encode(&img, cameron.Identicon([]byte(name), 540, 60))
+	png.Encode(&img, Identicon([]byte(name), 540, 60))
 	return img.Bytes()
 }
 


@@ 198,3 198,63 @@ func renderflags(h *Honk) {
 		return fmt.Sprintf(`<img class="emu" title="%s" src="%s">`, "flag", src)
 	})
 }
+
+// Identicon returns an identicon avatar based on the `data` with the `length`
+// and `blockLength`.
+func Identicon(data []byte, length, blockLength int) image.Image {
+	digest := xxhash.Sum64(data)
+	img := image.NewPaletted(
+		image.Rect(0, 0, length, length),
+		color.Palette{
+			color.NRGBA{
+				R: 0xff,
+				G: 0xff,
+				B: 0xee,
+				A: 0xff,
+			},
+			color.NRGBA{
+				R: 0,
+				G: 0,
+				B: 0xff,
+				A: 0xff,
+			},
+		},
+	)
+
+	if blockLength > length {
+		blockLength = length
+	}
+
+	columnsCount := length / blockLength
+	padding := blockLength / 2
+	if length%blockLength != 0 {
+		padding = (length - blockLength*columnsCount) / 2
+	} else if columnsCount > 1 {
+		columnsCount--
+	} else {
+		padding = 0
+	}
+
+	filled := columnsCount == 1
+	pixels := bytes.Repeat([]byte{1}, blockLength)
+	for i, ri, ci := 0, 0, 0; i < columnsCount*(columnsCount+1)/2; i++ {
+		if filled || digest>>uint(i%64)&1 == 1 {
+			for i := 0; i < blockLength; i++ {
+				x := padding + ri*blockLength
+				y := padding + ci*blockLength + i
+				copy(img.Pix[img.PixOffset(x, y):], pixels)
+
+				x = padding + (columnsCount-1-ri)*blockLength
+				copy(img.Pix[img.PixOffset(x, y):], pixels)
+			}
+		}
+
+		ci++
+		if ci == columnsCount {
+			ci = 0
+			ri++
+		}
+	}
+
+	return img
+}