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