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47 lines
842 B
47 lines
842 B
5 years ago
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package main
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import (
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"bytes"
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"crypto/sha512"
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"image"
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"image/png"
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)
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func avatar(name string) []byte {
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h := sha512.New()
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h.Write([]byte(name))
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s := h.Sum(nil)
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img := image.NewNRGBA(image.Rect(0, 0, 64, 64))
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for i := 0; i < 64; i++ {
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for j := 0; j < 64; j++ {
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p := i*img.Stride + j*4
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xx := i/16*16 + j/16
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x := s[xx]
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if x < 64 {
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img.Pix[p+0] = 32
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img.Pix[p+1] = 0
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img.Pix[p+2] = 64
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img.Pix[p+3] = 255
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} else if x < 128 {
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img.Pix[p+0] = 32
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img.Pix[p+1] = 0
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img.Pix[p+2] = 92
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img.Pix[p+3] = 255
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} else if x < 192 {
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img.Pix[p+0] = 64
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img.Pix[p+1] = 0
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img.Pix[p+2] = 128
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img.Pix[p+3] = 255
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} else {
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img.Pix[p+0] = 96
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img.Pix[p+1] = 0
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img.Pix[p+2] = 160
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img.Pix[p+3] = 255
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}
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}
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}
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var buf bytes.Buffer
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png.Encode(&buf, img)
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return buf.Bytes()
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}
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