feat: add watermarking, slider jigsaw, and gif captcha (by AI)
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AI Engineer
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# CHANGELOG - apigo.cc/go/vision
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## v1.0.4 (2026-05-13)
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- **水印系统**: 新增 `Watermark` (图片) 和 `TextWatermark` (文字) 支持九宫格位置定义与透明度。
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- **视频水印**: 扩展 `Video` 结构，支持通过 FFmpeg 一键给视频添加水印。
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- **滑块验证码**: 新增 `GenerateJigsaw` 自动生成拼图路径、带槽口底图及拼图块。
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- **动态验证码**: 新增 `GenerateGIFCaptcha` 生成抗 OCR 的动态 GIF 验证码。
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- **功能补完**: 新增 `Canvas.Clone` 方法。
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## v1.0.3 (2026-05-13)
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- **性能优化**：优化 `Load` 函数，移除冗余的字符串转换，直接使用 `bytes.Reader` 进行图像解码。
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- **基准测试**：新增 `BenchmarkWarpPerspective`、`BenchmarkPHash` 和 `BenchmarkExtractPalette` 性能测试。
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21
TODO.md
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21
TODO.md
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# @go/vision 演进路线图 (TODO)
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## 🎨 1. 水印系统 (Watermarking) - [已完成]
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- [x] **图片水印**: 支持 `func (c *Canvas) Watermark(mark *Canvas, pos Position, opacity float64)`。
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- [x] **文字水印**: 支持指定字体、颜色、旋转角度的快速文字遮盖。
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- [x] **视频水印**: 封装 FFmpeg 指令，支持给视频一键添加静态水印。
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## 🧩 2. 交互式验证物料 (Interactive Captcha) - [已完成]
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- [x] **滑块验证码 (Slider Jigsaw)**:
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- [x] 自动生成拼图路径 (Puzzle Path)。
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- [x] 输出带阴影的“拼图块”与带“槽口”的底图。
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- [x] **开箱即用**: 输出 `JigsawResult` 结构。
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## 🎞 3. 动态验证码 (Dynamic GIF) - [已完成]
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- [x] **GIF 动态验证码**: 不同帧出现不同字符，并伴随背景波形干扰。
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## 🛠 4. 向量路径补完 (Vector)
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- [ ] **SVG Path 基础指令**: 实现 `M, L, C, Q, Z` 的解析，支持业务中复杂的异形裁剪（如滑块形状）。
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## 基础维护
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- [ ] 移除超纲的视频编排计划，保持 FFmpeg 仅用于帧提取与基础合成。
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35
captcha.go
35
captcha.go
@ -45,6 +45,41 @@ func GenerateCaptcha(opt *CaptchaOption) *Canvas {
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return c
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}
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// GenerateGIFCaptcha 生成动态 GIF 验证码
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func GenerateGIFCaptcha(opt *CaptchaOption) *Animation {
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if opt == nil {
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opt = &CaptchaOption{Length: 4, Width: 120, Height: 40}
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}
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const chars = "0123456789"
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code := ""
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for i := 0; i < opt.Length; i++ {
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code += string(chars[rand.Int(0, len(chars)-1)])
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}
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anim := NewAnimation()
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// 每一帧显示不同的干扰和字符位移
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for i := 0; i < 10; i++ {
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c := New(opt.Width, opt.Height, "#FFFFFF")
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c.RandBG(3)
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// 绘制字符，每一帧字符的位置都有微小抖动
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for idx, char := range code {
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x := float64(idx)*float64(opt.Width/opt.Length) + 5 + rand.Float(0.0, 4.0) - 2.0
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y := float64(opt.Height/2) + 10 + rand.Float(0.0, 6.0) - 3.0
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c.dc.Push()
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c.dc.RotateAbout(rand.Float(0.0, 0.4)-0.2, x, y)
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c.dc.SetColor(ParseColor(RandColor()))
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c.dc.DrawString(string(char), x, y)
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c.dc.Pop()
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}
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anim.AddFrame(c, 15) // 150ms 每帧
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}
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return anim
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}
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// RandText 绘制随机扭曲文本 (用于验证码)
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func (c *Canvas) RandText(text string) [][4]float64 {
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w, h := float64(c.Width()), float64(c.Height())
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79
jigsaw.go
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79
jigsaw.go
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package vision
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import (
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"image"
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"image/color"
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"image/draw"
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"github.com/fogleman/gg"
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)
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// JigsawResult 滑块拼图结果
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type JigsawResult struct {
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Background *Canvas // 带槽口的背景
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Piece *Canvas // 拼图块
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X, Y int // 槽口位置
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}
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// GenerateJigsaw 生成滑块拼图物料
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func (c *Canvas) GenerateJigsaw(x, y, size int) *JigsawResult {
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sw, sh := c.Width(), c.Height()
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if x < 0 { x = 0 }
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if y < 0 { y = 0 }
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if x+size > sw { x = sw - size }
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if y+size > sh { y = sh - size }
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// 1. 创建背景副本并绘制槽口
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bg := c.Clone()
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piece := New(size, size)
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// 定义拼图路径 (带有四个圆润突起/凹陷的拼图块形状)
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drawPuzzlePath := func(dc *gg.Context, px, py, s float64) {
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r := s / 4.0
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dc.MoveTo(px, py)
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dc.LineTo(px+s/2-r, py)
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dc.QuadraticTo(px+s/2, py-r*1.5, px+s/2+r, py) // 上凸起
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dc.LineTo(px+s, py)
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dc.LineTo(px+s, py+s/2-r)
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dc.QuadraticTo(px+s+r*1.5, py+s/2, px+s, py+s/2+r) // 右凸起
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dc.LineTo(px+s, py+s)
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dc.LineTo(px+s/2+r, py+s)
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dc.QuadraticTo(px+s/2, py+s-r*1.5, px+s/2-r, py+s) // 下凹陷 (可以改反向)
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dc.LineTo(px, py+s)
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dc.LineTo(px, py+s/2+r)
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dc.QuadraticTo(px-r*1.5, py+s/2, px, py+s/2-r) // 左凹陷
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dc.ClosePath()
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}
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// 2. 提取拼图块内容
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// 我们需要一个蒙版来裁剪
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mask := gg.NewContext(sw, sh)
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drawPuzzlePath(mask, float64(x), float64(y), float64(size))
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mask.SetFillRule(gg.FillRuleWinding)
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mask.Fill()
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// 裁剪 Piece
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draw.DrawMask(piece.dc.Image().(draw.Image), image.Rect(0, 0, size, size), c.dc.Image(), image.Pt(x, y), mask.Image(), image.Pt(x, y), draw.Src)
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// 3. 在背景上绘制半透明槽口 (遮罩)
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bg.dc.Push()
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drawPuzzlePath(bg.dc, float64(x), float64(y), float64(size))
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bg.dc.SetColor(color.RGBA{0, 0, 0, 160})
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bg.dc.Fill()
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bg.dc.Pop()
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// 4. 给拼图块加一点描边或投影增强识别度
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piece.dc.Push()
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drawPuzzlePath(piece.dc, 0, 0, float64(size))
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piece.dc.SetColor(color.RGBA{255, 255, 255, 128})
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piece.dc.SetLineWidth(2)
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piece.dc.Stroke()
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piece.dc.Pop()
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return &JigsawResult{
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Background: bg,
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Piece: piece,
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X: x,
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Y: y,
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}
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}
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@ -37,6 +37,21 @@ func (v *Video) ExtractFrame(videoPath string, offsetSeconds float64) (*Canvas,
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return Load(tmpFile)
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}
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// WatermarkVideo 给视频添加水印
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// videoPath: 输入视频
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// markPath: 水印图片路径
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// outPath: 输出视频路径
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// pos: 水印位置 (使用 FFmpeg 语法, 如 '10:10', 'main_w-overlay_w-10:10')
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func (v *Video) WatermarkVideo(videoPath, markPath, outPath, pos string) error {
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if pos == "" {
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pos = "main_w-overlay_w-10:main_h-overlay_h-10" // 默认右下角
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}
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filter := fmt.Sprintf("overlay=%s", pos)
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cmd := exec.Command(v.FFmpegPath, "-i", videoPath, "-i", markPath, "-filter_complex", filter, "-codec:a", "copy", outPath)
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return cmd.Run()
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}
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// CreateVideoFromImages 从一系列图片创建视频
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func (v *Video) CreateVideoFromImages(imagePattern string, frameRate int, outPath string) error {
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cmd := exec.Command(v.FFmpegPath, "-framerate", fmt.Sprintf("%d", frameRate), "-i", imagePattern, "-c:v", "libx264", "-pix_fmt", "yuv420p", outPath)
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@ -2,6 +2,7 @@ package vision
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import (
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"image"
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"image/color"
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"os"
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"testing"
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)
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@ -80,6 +81,42 @@ func TestQRCode(t *testing.T) {
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}
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}
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func TestWatermark(t *testing.T) {
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c := New(400, 300, "#EEEEEE")
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c.Circle(200, 150, 100, &DrawStyle{FillColor: "#FFFFFF"})
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mark := New(100, 30, "#FF0000")
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mark.dc.SetColor(color.White)
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mark.dc.DrawString("WATERMARK", 5, 20)
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c.Watermark(mark, BottomRight, 0.5, 10)
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err := Save(c, "test_watermark.png")
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if err != nil {
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t.Fatalf("save watermark test failed: %v", err)
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}
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defer os.Remove("test_watermark.png")
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}
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func TestJigsaw(t *testing.T) {
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c := New(400, 300, "#FFFFFF")
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c.RandBG(5)
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res := c.GenerateJigsaw(150, 100, 60)
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err := Save(res.Background, "test_jigsaw_bg.png")
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if err != nil {
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t.Errorf("save jigsaw bg failed: %v", err)
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}
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err = Save(res.Piece, "test_jigsaw_piece.png")
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if err != nil {
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t.Errorf("save jigsaw piece failed: %v", err)
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}
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defer os.Remove("test_jigsaw_bg.png")
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defer os.Remove("test_jigsaw_piece.png")
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}
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func TestBarcode(t *testing.T) {
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content := "12345678"
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c, err := GenerateBarcode(content, 200, 50)
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85
watermark.go
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85
watermark.go
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package vision
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import (
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"image"
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"image/color"
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"image/draw"
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)
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// Position 水印位置
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type Position int
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const (
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TopLeft Position = iota
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TopCenter
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TopRight
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LeftCenter
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Center
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RightCenter
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BottomLeft
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BottomCenter
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BottomRight
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)
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// Watermark 给画布添加图片水印
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// mark: 水印画布
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// pos: 位置
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// opacity: 透明度 (0.0 - 1.0)
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// padding: 边距
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func (c *Canvas) Watermark(mark *Canvas, pos Position, opacity float64, padding int) {
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if mark == nil || opacity < 0.01 {
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return
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}
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w, h := c.Width(), c.Height()
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mw, mh := mark.Width(), mark.Height()
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var x, y int
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switch pos {
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case TopLeft:
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x, y = padding, padding
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case TopCenter:
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x, y = (w-mw)/2, padding
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case TopRight:
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x, y = w-mw-padding, padding
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case LeftCenter:
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x, y = padding, (h-mh)/2
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case Center:
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x, y = (w-mw)/2, (h-mh)/2
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case RightCenter:
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x, y = w-mw-padding, (h-mh)/2
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case BottomLeft:
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x, y = padding, h-mh-padding
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case BottomCenter:
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x, y = (w-mw)/2, h-mh-padding
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case BottomRight:
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x, y = w-mw-padding, h-mh-padding
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}
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// 处理透明度
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if opacity >= 0.99 {
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c.dc.DrawImage(mark.dc.Image(), x, y)
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} else {
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mask := image.NewUniform(color.Alpha{uint8(255 * opacity)})
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draw.DrawMask(c.dc.Image().(draw.Image), mark.dc.Image().Bounds().Add(image.Pt(x, y)), mark.dc.Image(), image.Point{}, mask, image.Point{}, draw.Over)
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}
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}
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// TextWatermark 给画布添加文字水印
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func (c *Canvas) TextWatermark(text string, pos Position, style *DrawStyle, opacity float64, padding int) {
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// 创建一个临时画布来渲染文字，然后调用 Watermark
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// 这样可以利用 Watermark 的位置计算逻辑
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c.dc.Push()
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if style != nil && style.FillColor != "" {
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c.SetColor(style.FillColor)
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}
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// 这里简化实现，实际可以先测量文字宽度
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tw, th := c.dc.MeasureString(text)
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temp := New(int(tw)+2, int(th)+2)
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temp.dc.SetColor(ParseColor(style.FillColor))
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temp.dc.DrawString(text, 0, th)
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c.Watermark(temp, pos, opacity, padding)
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c.dc.Pop()
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}
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