Better builtin avatar generator (#17707)

This PR fixes the builtin avatar generator.

1. The random background color makes some images very dirty. So now we only use white background for avatars.
2. We use left-right mirror avatars to satisfy #14799
3. Fix a small padding error in the algorithm

9 files changed, 0 insertions, 1043 deletions

diff --git a/vendor/github.com/issue9/identicon/.gitignore b/vendor/github.com/issue9/identicon/.gitignore
deleted file mode 100644
index 3e7884f1fa..0000000000
--- a/vendor/github.com/issue9/identicon/.gitignore
+++ /dev/null
@@ -1,23 +0,0 @@
-# Compiled Object files, Static and Dynamic libs (Shared Objects)
-*.o
-*.a
-*.so
-
-# Folders
-_obj
-_test
-
-*.exe
-*.test
-*.prof
-
-#vim
-*.swp
-
-#osx
-.DS_Store
-
-/testdata/*.png
-
-.idea
-.vscode
\ No newline at end of file
diff --git a/vendor/github.com/issue9/identicon/LICENSE b/vendor/github.com/issue9/identicon/LICENSE
deleted file mode 100644
index e92d1181e5..0000000000
--- a/vendor/github.com/issue9/identicon/LICENSE
+++ /dev/null
@@ -1,22 +0,0 @@
-The MIT License (MIT)
-
-Copyright (c) 2015 caixw
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in all
-copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.
-
diff --git a/vendor/github.com/issue9/identicon/README.md b/vendor/github.com/issue9/identicon/README.md
deleted file mode 100644
index 2331e953c6..0000000000
--- a/vendor/github.com/issue9/identicon/README.md
+++ /dev/null
@@ -1,38 +0,0 @@
-# identicon
-
-[![Go](https://github.com/issue9/identicon/actions/workflows/go.yml/badge.svg)](https://github.com/issue9/identicon/actions/workflows/go.yml)
-[![codecov](https://codecov.io/gh/issue9/identicon/branch/master/graph/badge.svg)](https://codecov.io/gh/issue9/identicon)
-[![PkgGoDev](https://pkg.go.dev/badge/github.com/issue9/identicon)](https://pkg.go.dev/github.com/issue9/identicon)
-![Go version](https://img.shields.io/github/go-mod/go-version/issue9/identicon)
-![License](https://img.shields.io/github/license/issue9/identicon)
-
-根据用户的 IP 、邮箱名等任意数据为用户产生漂亮的随机头像。
-
-![screenshot.1](https://raw.github.com/issue9/identicon/master/screenshot/1.png)
-![screenshot.4](https://raw.github.com/issue9/identicon/master/screenshot/4.png)
-![screenshot.5](https://raw.github.com/issue9/identicon/master/screenshot/5.png)
-![screenshot.6](https://raw.github.com/issue9/identicon/master/screenshot/6.png)
-![screenshot.7](https://raw.github.com/issue9/identicon/master/screenshot/7.png)
-
-```go
-// 根据用户访问的IP，为其生成一张头像
-img, _ := identicon.Make(128, color.NRGBA{},color.NRGBA{}, []byte("192.168.1.1"))
-fi, _ := os.Create("/tmp/u1.png")
-png.Encode(fi, img)
-fi.Close()
-
-// 或者
-ii, _ := identicon.New(128, color.NRGBA{}, color.NRGBA{}, color.NRGBA{}, color.NRGBA{})
-img := ii.Make([]byte("192.168.1.1"))
-img = ii.Make([]byte("192.168.1.2"))
-```
-
-## 安装
-
-```shell
-go get github.com/issue9/identicon
-```
-
-## 版权
-
-本项目采用 [MIT](https://opensource.org/licenses/MIT) 开源授权许可证，完整的授权说明可在 [LICENSE](LICENSE) 文件中找到。
diff --git a/vendor/github.com/issue9/identicon/block.go b/vendor/github.com/issue9/identicon/block.go
deleted file mode 100644
index 887ffea388..0000000000
--- a/vendor/github.com/issue9/identicon/block.go
+++ /dev/null
@@ -1,716 +0,0 @@
-// SPDX-License-Identifier: MIT
-
-package identicon
-
-import "image"
-
-var (
-	// 可以出现在中间的方块，一般为了美观，都是对称图像。
-	centerBlocks = []blockFunc{b0, b1, b2, b3, b19, b26, b27}
-
-	// 所有方块
-	blocks = []blockFunc{b0, b1, b2, b3, b4, b5, b6, b7, b8, b9, b10, b11, b12, b13, b14, b15, b16, b17, b18, b19, b20, b21, b22, b23, b24, b25, b26, b27}
-)
-
-// 所有 block 函数的类型
-type blockFunc func(img *image.Paletted, x, y, size int, angle int)
-
-// 将多边形 points 旋转 angle 个角度，然后输出到 img 上，起点为 x,y 坐标
-//
-// points 中的坐标是基于左上角是原点的坐标系。
-func drawBlock(img *image.Paletted, x, y, size int, angle int, points []int) {
-	if angle > 0 { // 0 角度不需要转换
-		m := size / 2
-		rotate(points, m, m, angle)
-	}
-
-	for i := 0; i < size; i++ {
-		for j := 0; j < size; j++ {
-			if pointInPolygon(i, j, points) {
-				img.SetColorIndex(x+i, y+j, 1)
-			}
-		}
-	}
-}
-
-// 全空白
-//
-//  --------
-//  |      |
-//  |      |
-//  |      |
-//  --------
-func b0(img *image.Paletted, x, y, size int, angle int) {}
-
-// 全填充正方形
-//
-//  --------
-//  |######|
-//  |######|
-//  |######|
-//  --------
-func b1(img *image.Paletted, x, y, size int, angle int) {
-	for i := x; i < x+size; i++ {
-		for j := y; j < y+size; j++ {
-			img.SetColorIndex(i, j, 1)
-		}
-	}
-}
-
-// 中间小方块
-//  ----------
-//  |        |
-//  |  ####  |
-//  |  ####  |
-//  |        |
-//  ----------
-func b2(img *image.Paletted, x, y, size int, angle int) {
-	l := size / 4
-	x = x + l
-	y = y + l
-
-	for i := x; i < x+2*l; i++ {
-		for j := y; j < y+2*l; j++ {
-			img.SetColorIndex(i, j, 1)
-		}
-	}
-}
-
-// 菱形
-//
-//  ---------
-//  |   #   |
-//  |  ###  |
-//  | ##### |
-//  |#######|
-//  | ##### |
-//  |  ###  |
-//  |   #   |
-//  ---------
-func b3(img *image.Paletted, x, y, size int, angle int) {
-	m := size / 2
-	drawBlock(img, x, y, size, 0, []int{
-		m, 0,
-		size, m,
-		m, size,
-		0, m,
-		m, 0,
-	})
-}
-
-// b4
-//
-//  -------
-//  |#####|
-//  |#### |
-//  |###  |
-//  |##   |
-//  |#    |
-//  |------
-func b4(img *image.Paletted, x, y, size int, angle int) {
-	drawBlock(img, x, y, size, angle, []int{
-		0, 0,
-		size, 0,
-		0, size,
-		0, 0,
-	})
-}
-
-// b5
-//
-//  ---------
-//  |   #   |
-//  |  ###  |
-//  | ##### |
-//  |#######|
-func b5(img *image.Paletted, x, y, size int, angle int) {
-	m := size / 2
-	drawBlock(img, x, y, size, angle, []int{
-		m, 0,
-		size, size,
-		0, size,
-		m, 0,
-	})
-}
-
-// b6 矩形
-//
-//  --------
-//  |###   |
-//  |###   |
-//  |###   |
-//  --------
-func b6(img *image.Paletted, x, y, size int, angle int) {
-	m := size / 2
-	drawBlock(img, x, y, size, angle, []int{
-		0, 0,
-		m, 0,
-		m, size,
-		0, size,
-		0, 0,
-	})
-}
-
-// b7 斜放的锥形
-//
-//  ---------
-//  | #     |
-//  |  ##   |
-//  |  #####|
-//  |   ####|
-//  |--------
-func b7(img *image.Paletted, x, y, size int, angle int) {
-	m := size / 2
-	drawBlock(img, x, y, size, angle, []int{
-		0, 0,
-		size, m,
-		size, size,
-		m, size,
-		0, 0,
-	})
-}
-
-// b8 三个堆叠的三角形
-//
-//  -----------
-//  |    #    |
-//  |   ###   |
-//  |  #####  |
-//  |  #   #  |
-//  | ### ### |
-//  |#########|
-//  -----------
-func b8(img *image.Paletted, x, y, size int, angle int) {
-	m := size / 2
-	mm := m / 2
-
-	// 顶部三角形
-	drawBlock(img, x, y, size, angle, []int{
-		m, 0,
-		3 * mm, m,
-		mm, m,
-		m, 0,
-	})
-
-	// 底下左边
-	drawBlock(img, x, y, size, angle, []int{
-		mm, m,
-		m, size,
-		0, size,
-		mm, m,
-	})
-
-	// 底下右边
-	drawBlock(img, x, y, size, angle, []int{
-		3 * mm, m,
-		size, size,
-		m, size,
-		3 * mm, m,
-	})
-}
-
-// b9 斜靠的三角形
-//
-//  ---------
-//  |#      |
-//  | ####  |
-//  |  #####|
-//  |  #### |
-//  |   #   |
-//  ---------
-func b9(img *image.Paletted, x, y, size int, angle int) {
-	m := size / 2
-	drawBlock(img, x, y, size, angle, []int{
-		0, 0,
-		size, m,
-		m, size,
-		0, 0,
-	})
-}
-
-// b10
-//
-//  ----------
-//  |    ####|
-//  |    ### |
-//  |    ##  |
-//  |    #   |
-//  |####    |
-//  |###     |
-//  |##      |
-//  |#       |
-//  ----------
-func b10(img *image.Paletted, x, y, size int, angle int) {
-	m := size / 2
-	drawBlock(img, x, y, size, angle, []int{
-		m, 0,
-		size, 0,
-		m, m,
-		m, 0,
-	})
-
-	drawBlock(img, x, y, size, angle, []int{
-		0, m,
-		m, m,
-		0, size,
-		0, m,
-	})
-}
-
-// b11 左上角1/4大小的方块
-//
-//  ----------
-//  |####    |
-//  |####    |
-//  |####    |
-//  |        |
-//  |        |
-//  ----------
-func b11(img *image.Paletted, x, y, size int, angle int) {
-	m := size / 2
-	drawBlock(img, x, y, size, angle, []int{
-		0, 0,
-		m, 0,
-		m, m,
-		0, m,
-		0, 0,
-	})
-}
-
-// b12
-//
-//  -----------
-//  |         |
-//  |         |
-//  |#########|
-//  |  #####  |
-//  |    #    |
-//  -----------
-func b12(img *image.Paletted, x, y, size int, angle int) {
-	m := size / 2
-	drawBlock(img, x, y, size, angle, []int{
-		0, m,
-		size, m,
-		m, size,
-		0, m,
-	})
-}
-
-// b13
-//
-//  -----------
-//  |         |
-//  |         |
-//  |    #    |
-//  |  #####  |
-//  |#########|
-//  -----------
-func b13(img *image.Paletted, x, y, size int, angle int) {
-	m := size / 2
-	drawBlock(img, x, y, size, angle, []int{
-		m, m,
-		size, size,
-		0, size,
-		m, m,
-	})
-}
-
-// b14
-//
-//  ---------
-//  |   #   |
-//  | ###   |
-//  |####   |
-//  |       |
-//  |       |
-//  ---------
-func b14(img *image.Paletted, x, y, size int, angle int) {
-	m := size / 2
-	drawBlock(img, x, y, size, angle, []int{
-		m, 0,
-		m, m,
-		0, m,
-		m, 0,
-	})
-}
-
-// b15
-//
-//  ----------
-//  |#####   |
-//  |###     |
-//  |#       |
-//  |        |
-//  |        |
-//  ----------
-func b15(img *image.Paletted, x, y, size int, angle int) {
-	m := size / 2
-	drawBlock(img, x, y, size, angle, []int{
-		0, 0,
-		m, 0,
-		0, m,
-		0, 0,
-	})
-}
-
-// b16
-//
-//  ---------
-//  |   #   |
-//  | ##### |
-//  |#######|
-//  |   #   |
-//  | ##### |
-//  |#######|
-//  ---------
-func b16(img *image.Paletted, x, y, size int, angle int) {
-	m := size / 2
-	drawBlock(img, x, y, size, angle, []int{
-		m, 0,
-		size, m,
-		0, m,
-		m, 0,
-	})
-
-	drawBlock(img, x, y, size, angle, []int{
-		m, m,
-		size, size,
-		0, size,
-		m, m,
-	})
-}
-
-// b17
-//
-//  ----------
-//  |#####   |
-//  |###     |
-//  |#       |
-//  |      ##|
-//  |      ##|
-//  ----------
-func b17(img *image.Paletted, x, y, size int, angle int) {
-	m := size / 2
-
-	drawBlock(img, x, y, size, angle, []int{
-		0, 0,
-		m, 0,
-		0, m,
-		0, 0,
-	})
-
-	quarter := size / 4
-	drawBlock(img, x, y, size, angle, []int{
-		size - quarter, size - quarter,
-		size, size - quarter,
-		size, size,
-		size - quarter, size,
-		size - quarter, size - quarter,
-	})
-}
-
-// b18
-//
-//  ----------
-//  |#####   |
-//  |####    |
-//  |###     |
-//  |##      |
-//  |#       |
-//  ----------
-func b18(img *image.Paletted, x, y, size int, angle int) {
-	m := size / 2
-
-	drawBlock(img, x, y, size, angle, []int{
-		0, 0,
-		m, 0,
-		0, size,
-		0, 0,
-	})
-}
-
-// b19
-//
-//  ----------
-//  |########|
-//  |###  ###|
-//  |#      #|
-//  |###  ###|
-//  |########|
-//  ----------
-func b19(img *image.Paletted, x, y, size int, angle int) {
-	m := size / 2
-
-	drawBlock(img, x, y, size, angle, []int{
-		0, 0,
-		m, 0,
-		0, m,
-		0, 0,
-	})
-
-	drawBlock(img, x, y, size, angle, []int{
-		m, 0,
-		size, 0,
-		size, m,
-		m, 0,
-	})
-
-	drawBlock(img, x, y, size, angle, []int{
-		size, m,
-		size, size,
-		m, size,
-		size, m,
-	})
-
-	drawBlock(img, x, y, size, angle, []int{
-		0, m,
-		m, size,
-		0, size,
-		0, m,
-	})
-}
-
-// b20
-//
-//  ----------
-//  |  ##     |
-//  |###      |
-//  |##       |
-//  |##       |
-//  |#        |
-//  ----------
-func b20(img *image.Paletted, x, y, size int, angle int) {
-	m := size / 2
-	q := size / 4
-
-	drawBlock(img, x, y, size, angle, []int{
-		q, 0,
-		0, size,
-		0, m,
-		q, 0,
-	})
-}
-
-// b21
-//
-//  ----------
-//  | ####   |
-//  |## #####|
-//  |##    ##|
-//  |##      |
-//  |#       |
-//  ----------
-func b21(img *image.Paletted, x, y, size int, angle int) {
-	m := size / 2
-	q := size / 4
-
-	drawBlock(img, x, y, size, angle, []int{
-		q, 0,
-		0, size,
-		0, m,
-		q, 0,
-	})
-
-	drawBlock(img, x, y, size, angle, []int{
-		q, 0,
-		size, q,
-		size, m,
-		q, 0,
-	})
-}
-
-// b22
-//
-//  ----------
-//  | ####   |
-//  |##  ### |
-//  |##    ##|
-//  |##    ##|
-//  |#      #|
-//  ----------
-func b22(img *image.Paletted, x, y, size int, angle int) {
-	m := size / 2
-	q := size / 4
-
-	drawBlock(img, x, y, size, angle, []int{
-		q, 0,
-		0, size,
-		0, m,
-		q, 0,
-	})
-
-	drawBlock(img, x, y, size, angle, []int{
-		q, 0,
-		size, q,
-		size, size,
-		q, 0,
-	})
-}
-
-// b23
-//
-//  ----------
-//  | #######|
-//  |###    #|
-//  |##      |
-//  |##      |
-//  |#       |
-//  ----------
-func b23(img *image.Paletted, x, y, size int, angle int) {
-	m := size / 2
-	q := size / 4
-
-	drawBlock(img, x, y, size, angle, []int{
-		q, 0,
-		0, size,
-		0, m,
-		q, 0,
-	})
-
-	drawBlock(img, x, y, size, angle, []int{
-		q, 0,
-		size, 0,
-		size, q,
-		q, 0,
-	})
-}
-
-// b24
-//
-//  ----------
-//  | ##  ###|
-//  |###  ###|
-//  |##  ##  |
-//  |##  ##  |
-//  |#   #   |
-//  ----------
-func b24(img *image.Paletted, x, y, size int, angle int) {
-	m := size / 2
-	q := size / 4
-
-	drawBlock(img, x, y, size, angle, []int{
-		q, 0,
-		0, size,
-		0, m,
-		q, 0,
-	})
-
-	drawBlock(img, x, y, size, angle, []int{
-		m, 0,
-		size, 0,
-		m, size,
-		m, 0,
-	})
-}
-
-// b25
-//
-//  ----------
-//  |#      #|
-//  |##   ###|
-//  |##  ##  |
-//  |######  |
-//  |####    |
-//  ----------
-func b25(img *image.Paletted, x, y, size int, angle int) {
-	m := size / 2
-	q := size / 4
-
-	drawBlock(img, x, y, size, angle, []int{
-		0, 0,
-		0, size,
-		q, size,
-		0, 0,
-	})
-
-	drawBlock(img, x, y, size, angle, []int{
-		0, m,
-		size, 0,
-		q, size,
-		0, m,
-	})
-}
-
-// b26
-//
-//  ----------
-//  |#      #|
-//  |###  ###|
-//  |  ####  |
-//  |###  ###|
-//  |#      #|
-//  ----------
-func b26(img *image.Paletted, x, y, size int, angle int) {
-	m := size / 2
-	q := size / 4
-
-	drawBlock(img, x, y, size, angle, []int{
-		0, 0,
-		m, q,
-		q, m,
-		0, 0,
-	})
-
-	drawBlock(img, x, y, size, angle, []int{
-		size, 0,
-		m + q, m,
-		m, q,
-		size, 0,
-	})
-
-	drawBlock(img, x, y, size, angle, []int{
-		size, size,
-		m, m + q,
-		q + m, m,
-		size, size,
-	})
-
-	drawBlock(img, x, y, size, angle, []int{
-		0, size,
-		q, m,
-		m, q + m,
-		0, size,
-	})
-}
-
-// b27
-//
-//  ----------
-//  |########|
-//  |##   ###|
-//  |#      #|
-//  |###   ##|
-//  |########|
-//  ----------
-func b27(img *image.Paletted, x, y, size int, angle int) {
-	m := size / 2
-	q := size / 4
-
-	drawBlock(img, x, y, size, angle, []int{
-		0, 0,
-		size, 0,
-		0, q,
-		0, 0,
-	})
-
-	drawBlock(img, x, y, size, angle, []int{
-		q + m, 0,
-		size, 0,
-		size, size,
-		q + m, 0,
-	})
-
-	drawBlock(img, x, y, size, angle, []int{
-		size, q + m,
-		size, size,
-		0, size,
-		size, q + m,
-	})
-
-	drawBlock(img, x, y, size, angle, []int{
-		0, size,
-		0, 0,
-		q, size,
-		0, size,
-	})
-}
diff --git a/vendor/github.com/issue9/identicon/doc.go b/vendor/github.com/issue9/identicon/doc.go
deleted file mode 100644
index 3a7129829a..0000000000
--- a/vendor/github.com/issue9/identicon/doc.go
+++ /dev/null
@@ -1,35 +0,0 @@
-// SPDX-License-Identifier: MIT
-
-// Package identicon 一个基于 hash 值生成随机图像的包
-//
-// identicon 并没有统一的标准，一般用于在用户注册时，
-// 取用户的邮箱或是访问 IP 等数据(也可以是其它任何数据)，
-// 进行 hash 运算，之后根据 hash 数据，产生一张图像，
-// 这样即可以为用户产生一张独特的头像，又不会泄漏用户的隐藏。
-//
-// 在 identicon 中，把图像分成以下九个部分:
-//  -------------
-//  | 1 | 2 | 3 |
-//  -------------
-//  | 4 | 5 | 6 |
-//  -------------
-//  | 7 | 8 | 9 |
-//  -------------
-// 其中 1、3、9、7 为不同角度(依次增加 90 度)的同一张图片，
-// 2、6、8、4 也是如此，这样可以保持图像是对称的，比较美观。
-// 5 则单独使用一张图片。
-//
-//  // 根据用户访问的 IP ，为其生成一张头像
-//  img, _ := identicon.Make(128, color.NRGBA{},color.NRGBA{}, []byte("192.168.1.1"))
-//  fi, _ := os.Create("/tmp/u1.png")
-//  png.Encode(fi, img)
-//  fi.Close()
-//
-//  // 或者
-//  ii, _ := identicon.New(128, color.NRGBA{}, color.NRGBA{}, color.NRGBA{})
-//  img := ii.Make([]byte("192.168.1.1"))
-//  img = ii.Make([]byte("192.168.1.2"))
-//
-// NOTE: go test 会在当前目录的 testdata 文件夹下产生大量的随机图片。
-// 要运行测试，必须保证该文件夹是存在的，且有相应的写入权限。
-package identicon
diff --git a/vendor/github.com/issue9/identicon/go.mod b/vendor/github.com/issue9/identicon/go.mod
deleted file mode 100644
index 3c0f2a918f..0000000000
--- a/vendor/github.com/issue9/identicon/go.mod
+++ /dev/null
@@ -1,5 +0,0 @@
-module github.com/issue9/identicon
-
-require github.com/issue9/assert v1.4.1
-
-go 1.13
diff --git a/vendor/github.com/issue9/identicon/go.sum b/vendor/github.com/issue9/identicon/go.sum
deleted file mode 100644
index e03cdc34cc..0000000000
--- a/vendor/github.com/issue9/identicon/go.sum
+++ /dev/null
@@ -1,2 +0,0 @@
-github.com/issue9/assert v1.4.1 h1:gUtOpMTeaE4JTe9kACma5foOHBvVt1p5XTFrULDwdXI=
-github.com/issue9/assert v1.4.1/go.mod h1:Yktk83hAVl1SPSYtd9kjhBizuiBIqUQyj+D5SE2yjVY=
diff --git a/vendor/github.com/issue9/identicon/identicon.go b/vendor/github.com/issue9/identicon/identicon.go
deleted file mode 100644
index 1c34d2f060..0000000000
--- a/vendor/github.com/issue9/identicon/identicon.go
+++ /dev/null
@@ -1,137 +0,0 @@
-// SPDX-License-Identifier: MIT
-
-package identicon
-
-import (
-	"crypto/md5"
-	"fmt"
-	"image"
-	"image/color"
-	"math/rand"
-)
-
-const (
-	minSize       = 16 // 图片的最小尺寸
-	maxForeColors = 32 // 在New()函数中可以指定的最大颜色数量
-)
-
-// Identicon 用于产生统一尺寸的头像
-//
-// 可以根据用户提供的数据，经过一定的算法，自动产生相应的图案和颜色。
-type Identicon struct {
-	foreColors []color.Color
-	backColor  color.Color
-	size       int
-	rect       image.Rectangle
-}
-
-// New 声明一个 Identicon 实例
-//
-// size 表示整个头像的大小；
-// back 表示前景色；
-// fore 表示所有可能的前景色，会为每个图像随机挑选一个作为其前景色。
-func New(size int, back color.Color, fore ...color.Color) (*Identicon, error) {
-	if len(fore) == 0 || len(fore) > maxForeColors {
-		return nil, fmt.Errorf("前景色数量必须介于[1]~[%d]之间，当前为[%d]", maxForeColors, len(fore))
-	}
-
-	if size < minSize {
-		return nil, fmt.Errorf("参数 size 的值(%d)不能小于 %d", size, minSize)
-	}
-
-	return &Identicon{
-		foreColors: fore,
-		backColor:  back,
-		size:       size,
-
-		// 画布坐标从0开始，其长度应该是 size-1
-		rect: image.Rect(0, 0, size, size),
-	}, nil
-}
-
-// Make 根据 data 数据产生一张唯一性的头像图片
-func (i *Identicon) Make(data []byte) image.Image {
-	h := md5.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
-	color := int(sum[11]+sum[12]+sum[15]) % len(i.foreColors)
-
-	return i.render(c, b1, b2, b1Angle, b2Angle, color)
-}
-
-// Rand 随机生成图案
-func (i *Identicon) Rand(r *rand.Rand) image.Image {
-	b1 := r.Intn(len(blocks))
-	b2 := r.Intn(len(blocks))
-	c := r.Intn(len(centerBlocks))
-	b1Angle := r.Intn(4)
-	b2Angle := r.Intn(4)
-	color := r.Intn(len(i.foreColors))
-
-	return i.render(c, b1, b2, b1Angle, b2Angle, color)
-}
-
-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
-}
-
-// Make 根据 data 数据产生一张唯一性的头像图片
-//
-// size 头像的大小。
-// back, fore头像的背景和前景色。
-func Make(size int, back, fore color.Color, data []byte) (image.Image, error) {
-	i, err := New(size, back, fore)
-	if err != nil {
-		return nil, err
-	}
-	return i.Make(data), nil
-}
-
-// 将九个方格都填上内容。
-// p 为画板；
-// c 为中间方格的填充函数；
-// b1、b2 为边上 8 格的填充函数；
-// b1Angle 和 b2Angle 为 b1、b2 的起始旋转角度。
-func drawBlocks(p *image.Paletted, size int, c, b1, b2 blockFunc, b1Angle, b2Angle int) {
-	incr := func(a int) int {
-		if a >= 3 {
-			a = 0
-		} else {
-			a++
-		}
-		return a
-	}
-
-	padding := (size % 6) / 2 // 不能除尽的，边上留白。
-
-	blockSize := size / 3
-	twoBlockSize := 2 * blockSize
-
-	c(p, blockSize+padding, blockSize+padding, blockSize, 0)
-
-	b1(p, 0+padding, 0+padding, blockSize, b1Angle)
-	b2(p, blockSize+padding, 0+padding, blockSize, b2Angle)
-
-	b1Angle = incr(b1Angle)
-	b2Angle = incr(b2Angle)
-	b1(p, twoBlockSize+padding, 0+padding, blockSize, b1Angle)
-	b2(p, twoBlockSize+padding, blockSize+padding, blockSize, b2Angle)
-
-	b1Angle = incr(b1Angle)
-	b2Angle = incr(b2Angle)
-	b1(p, twoBlockSize+padding, twoBlockSize+padding, blockSize, b1Angle)
-	b2(p, blockSize+padding, twoBlockSize+padding, blockSize, b2Angle)
-
-	b1Angle = incr(b1Angle)
-	b2Angle = incr(b2Angle)
-	b1(p, 0+padding, twoBlockSize+padding, blockSize, b1Angle)
-	b2(p, 0+padding, blockSize+padding, blockSize, b2Angle)
-}
diff --git a/vendor/github.com/issue9/identicon/polygon.go b/vendor/github.com/issue9/identicon/polygon.go
deleted file mode 100644
index eedb98c834..0000000000
--- a/vendor/github.com/issue9/identicon/polygon.go
+++ /dev/null
@@ -1,65 +0,0 @@
-// SPDX-License-Identifier: MIT
-
-package identicon
-
-var (
-	// 4 个元素分别表示 cos(0),cos(90),cos(180),cos(270)
-	cos = []int{1, 0, -1, 0}
-
-	// 4 个元素分别表示 sin(0),sin(90),sin(180),sin(270)
-	sin = []int{0, 1, 0, -1}
-)
-
-// 将 points 中的所有点，以 x,y 为原点旋转 angle 个角度。
-// angle 取值只能是 [0,1,2,3]，分别表示 [0，90，180，270]
-func rotate(points []int, x, y int, angle int) {
-	if angle < 0 || angle > 3 {
-		panic("rotate:参数angle必须0,1,2,3三值之一")
-	}
-
-	for i := 0; i < len(points); i += 2 {
-		px, py := points[i]-x, points[i+1]-y
-		points[i] = px*cos[angle] - py*sin[angle] + x
-		points[i+1] = px*sin[angle] + py*cos[angle] + y
-	}
-}
-
-// 判断某个点是否在多边形之内，不包含构成多边形的线和点
-// x,y 需要判断的点坐标
-// points 组成多边形的所顶点，每两个元素表示一点顶点，其中最后一个顶点必须与第一个顶点相同。
-func pointInPolygon(x, y int, points []int) bool {
-	if len(points) < 8 { // 只有2个以上的点，才能组成闭合多边形
-		return false
-	}
-
-	// 大致算法如下：
-	// 把整个平面以给定的测试点为原点分两部分:
-	// - y>0，包含(x>0 && y==0)
-	// - y<0，包含(x<0 && y==0)
-	// 依次扫描每一个点，当该点与前一个点处于不同部分时（即一个在 y>0 区，一个在 y<0 区），
-	// 则判断从前一点到当前点是顺时针还是逆时针（以给定的测试点为原点），如果是顺时针 r++，否则 r--。
-	// 结果为：2==abs(r)。
-
-	r := 0
-	x1, y1 := points[0], points[1]
-	prev := (y1 > y) || ((x1 > x) && (y1 == y))
-	for i := 2; i < len(points); i += 2 {
-		x2, y2 := points[i], points[i+1]
-		curr := (y2 > y) || ((x2 > x) && (y2 == y))
-
-		if curr == prev {
-			x1, y1 = x2, y2
-			continue
-		}
-
-		if mul := (x1-x)*(y2-y) - (x2-x)*(y1-y); mul >= 0 {
-			r++
-		} else if mul < 0 {
-			r--
-		}
-		x1, y1 = x2, y2
-		prev = curr
-	}
-
-	return r == 2 || r == -2
-}