56 lines
1.1 KiB
Go
56 lines
1.1 KiB
Go
package identicon
|
|
|
|
import (
|
|
"bytes"
|
|
"encoding/base64"
|
|
"image"
|
|
"image/color"
|
|
"image/draw"
|
|
"image/png"
|
|
)
|
|
|
|
func renderBase64(id Identicon) (string, error) {
|
|
img := image.NewRGBA(image.Rect(0, 0, 50, 50))
|
|
var buff bytes.Buffer
|
|
|
|
setBackgroundWhite(img)
|
|
|
|
for i, v := range id.bitmap {
|
|
if v == 1 {
|
|
drawRect(img, i, id.color)
|
|
}
|
|
}
|
|
|
|
if err := png.Encode(&buff, img); err != nil {
|
|
return "", err
|
|
}
|
|
|
|
encodedString := base64.StdEncoding.EncodeToString(buff.Bytes())
|
|
image := "data:image/png;base64," + encodedString
|
|
return image, nil
|
|
}
|
|
|
|
func setBackgroundWhite(img *image.RGBA) {
|
|
draw.Draw(img, img.Bounds(), &image.Uniform{C: color.White}, image.Point{}, draw.Src)
|
|
}
|
|
|
|
func drawRect(rgba *image.RGBA, i int, c color.Color) {
|
|
sizeSquare := 6
|
|
maxRow := 5
|
|
|
|
r := image.Rect(
|
|
10+(i%maxRow)*sizeSquare,
|
|
10+(i/maxRow)*sizeSquare,
|
|
10+(i%maxRow)*sizeSquare+sizeSquare,
|
|
10+(i/maxRow)*sizeSquare+sizeSquare,
|
|
)
|
|
|
|
draw.Draw(rgba, r, &image.Uniform{C: c}, image.Point{}, draw.Src)
|
|
}
|
|
|
|
// GenerateBase64 generates an identicon in base64 png format given a string
|
|
func GenerateBase64(id string) (string, error) {
|
|
i := generate(id)
|
|
return renderBase64(i)
|
|
}
|