mirror of
https://github.com/hanzoai/forge.git
synced 2026-10-30 15:00:39 +00:00
zeekayandHanzo Dev
aa87442fdd
Source files keep their SPDX-License-Identifier and Hanzo copyright line; the Gitea, Gogs and LFS Test Server copyrights they used to repeat now live once in NOTICE, alongside LICENSE. The header lint accepts any copyright line above the SPDX line, so it no longer demands an upstream one. Co-authored-by: Hanzo Dev <[email protected]>
135 lines
3.6 KiB
Go
135 lines
3.6 KiB
Go
// Copyright 2026 Hanzo AI, Inc. All rights reserved.
|
|
// SPDX-License-Identifier: MIT
|
|
|
|
// Copied and modified from https://github.com/issue9/identicon/ (MIT License)
|
|
// Generate pseudo-random avatars by IP, E-mail, etc.
|
|
|
|
package identicon
|
|
|
|
import (
|
|
"crypto/sha256"
|
|
"image"
|
|
"image/color"
|
|
)
|
|
|
|
const (
|
|
minImageSize = 16
|
|
maxImageSize = 2048
|
|
)
|
|
|
|
// Identicon is used to generate pseudo-random avatars
|
|
type Identicon struct {
|
|
foreColors []color.Color
|
|
backColor color.Color
|
|
size int
|
|
rect image.Rectangle
|
|
}
|
|
|
|
// New returns an Identicon struct.
|
|
// Only one foreground color will be picked randomly for one image.
|
|
func New(size int, backColor color.Color, foreColors []color.Color) *Identicon {
|
|
size = max(size, minImageSize)
|
|
size = min(size, maxImageSize)
|
|
return &Identicon{
|
|
foreColors: foreColors,
|
|
backColor: backColor,
|
|
size: size,
|
|
rect: image.Rect(0, 0, size, size),
|
|
}
|
|
}
|
|
|
|
// Make generates an avatar by data
|
|
func (i *Identicon) Make(data []byte) image.Image {
|
|
h := sha256.New()
|
|
h.Write(data)
|
|
sum := h.Sum(nil)
|
|
|
|
b1 := int(sum[0]+sum[1]+sum[2]) % len(blocks)
|
|
b2 := int(sum[3]+sum[4]+sum[5]) % len(blocks)
|
|
c := int(sum[6]+sum[7]+sum[8]) % len(centerBlocks)
|
|
b1Angle := int(sum[9]+sum[10]) % 4
|
|
b2Angle := int(sum[11]+sum[12]) % 4
|
|
foreColor := int(sum[11]+sum[12]+sum[15]) % len(i.foreColors)
|
|
|
|
return i.render(c, b1, b2, b1Angle, b2Angle, foreColor)
|
|
}
|
|
|
|
func (i *Identicon) render(c, b1, b2, b1Angle, b2Angle, foreColor int) image.Image {
|
|
p := image.NewPaletted(i.rect, []color.Color{i.backColor, i.foreColors[foreColor]})
|
|
drawBlocks(p, i.size, centerBlocks[c], blocks[b1], blocks[b2], b1Angle, b2Angle)
|
|
return p
|
|
}
|
|
|
|
/*
|
|
# Algorithm
|
|
|
|
Origin: An image is split into 9 areas
|
|
|
|
```
|
|
-------------
|
|
| 1 | 2 | 3 |
|
|
-------------
|
|
| 4 | 5 | 6 |
|
|
-------------
|
|
| 7 | 8 | 9 |
|
|
-------------
|
|
```
|
|
|
|
Area 1/3/9/7 use a 90-degree rotating pattern.
|
|
Area 1/3/9/7 use another 90-degree rotating pattern.
|
|
Area 5 uses a random pattern.
|
|
|
|
The Patched Fix: make the image left-right mirrored to get rid of something like "swastika"
|
|
*/
|
|
|
|
// draw blocks to the paletted
|
|
// c: the block drawer for the center block
|
|
// b1,b2: the block drawers for other blocks (around the center block)
|
|
// b1Angle,b2Angle: the angle for the rotation of b1/b2
|
|
func drawBlocks(p *image.Paletted, size int, c, b1, b2 blockFunc, b1Angle, b2Angle int) {
|
|
nextAngle := func(a int) int {
|
|
return (a + 1) % 4
|
|
}
|
|
|
|
padding := (size % 3) / 2 // in cased the size can not be aligned by 3 blocks.
|
|
|
|
blockSize := size / 3
|
|
twoBlockSize := 2 * blockSize
|
|
|
|
// center
|
|
c(p, blockSize+padding, blockSize+padding, blockSize, 0)
|
|
|
|
// left top (1)
|
|
b1(p, 0+padding, 0+padding, blockSize, b1Angle)
|
|
// center top (2)
|
|
b2(p, blockSize+padding, 0+padding, blockSize, b2Angle)
|
|
|
|
b1Angle = nextAngle(b1Angle)
|
|
b2Angle = nextAngle(b2Angle)
|
|
// right top (3)
|
|
// b1(p, twoBlockSize+padding, 0+padding, blockSize, b1Angle)
|
|
// right middle (6)
|
|
// b2(p, twoBlockSize+padding, blockSize+padding, blockSize, b2Angle)
|
|
|
|
b1Angle = nextAngle(b1Angle)
|
|
b2Angle = nextAngle(b2Angle)
|
|
// right bottom (9)
|
|
// b1(p, twoBlockSize+padding, twoBlockSize+padding, blockSize, b1Angle)
|
|
// center bottom (8)
|
|
b2(p, blockSize+padding, twoBlockSize+padding, blockSize, b2Angle)
|
|
|
|
b1Angle = nextAngle(b1Angle)
|
|
b2Angle = nextAngle(b2Angle)
|
|
// lef bottom (7)
|
|
b1(p, 0+padding, twoBlockSize+padding, blockSize, b1Angle)
|
|
// left middle (4)
|
|
b2(p, 0+padding, blockSize+padding, blockSize, b2Angle)
|
|
|
|
// then we make it left-right mirror, so we didn't draw 3/6/9 before
|
|
for x := 0; x < size/2; x++ {
|
|
for y := range size {
|
|
p.SetColorIndex(size-x, y, p.ColorIndexAt(x, y))
|
|
}
|
|
}
|
|
}
|