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62 lines
1.6 KiB
62 lines
1.6 KiB
//
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// Copyright (c) 2019 Ted Unangst <tedu@tedunangst.com>
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//
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// Permission to use, copy, modify, and distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice appear in all copies.
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//
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// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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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] = 16
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img.Pix[p+1] = 0
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img.Pix[p+2] = 48
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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] = 48
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img.Pix[p+1] = 0
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img.Pix[p+2] = 96
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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] = 72
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img.Pix[p+1] = 0
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img.Pix[p+2] = 144
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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] = 192
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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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