1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
| // Generate a simple avatar based on a hash of your name
//
// Derived from Ted Unangst's Honk
// https://humungus.tedunangst.com/r/honk/v/tip/f/avatar.go
//
// Copyright (c) 2019 Alex Wennerberg, Ted Unangst <tedu@tedunangst.com>
//
// Permission to use, copy, modify, and distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
package main
import (
"bytes"
"crypto/sha512"
"fmt"
"image"
"image/png"
"io/ioutil"
"os"
)
// Modify the four colors used
var avatarcolors = [4][4]byte{
{0, 0, 0, 255},
{255, 255, 255, 255},
{172, 172, 172, 255},
{96, 96, 96, 255},
}
// x and y dimensions in pixels
const size = 400
func genAvatar(name string) []byte {
h := sha512.New()
h.Write([]byte(name))
s := h.Sum(nil)
// Mess with these numbers to change the size
img := image.NewNRGBA(image.Rect(0, 0, size, size))
for i := 0; i < size; i++ {
for j := 0; j < size; j++ {
p := i*img.Stride + j*4
xx := i/(size/4)*16 + j/(size/4)
x := s[xx]
for n := 0; n < 4; n++ {
img.Pix[p+n] = avatarcolors[x/64][n]
}
}
}
var buf bytes.Buffer
png.Encode(&buf, img)
return buf.Bytes()
}
func main() {
if len(os.Args) > 2 {
avatar := genAvatar(os.Args[1])
ioutil.WriteFile(os.Args[2], avatar, 0644)
} else {
fmt.Println("Usage: [script] name output_file.png")
os.Exit(1)
}
}
|
