golang中实现给gif、png、jpeg图片添加文字水印_Golang_

 package main import ( "fmt" "watermark/textwatermark" ) func main() { SavePath := "./kaf" str := textwatermark.FontInfo{18, "努力向上", textwatermark.TopLeft, 20, 20, 255, 255, 0, 255} arr := make([]textwatermark.FontInfo, 0) arr = append(arr, str) str2 := textwatermark.FontInfo{Size: 24, Message: "努力向上，涨工资", Position: textwatermark.TopLeft, Dx: 20, Dy: 40, R: 255, G: 255, B: 0, A: 255} arr = append(arr, str2) //加水印图片路径 // fileName := "123123.jpg" fileName := "17.gif" w := new(textwatermark.Water) w.Pattern = "2006/01/02" textwatermark.Ttf = "./wrzh.ttf" //字体路径 err := w.New(SavePath, fileName, arr) if err != nil { fmt.Println(err) } } 

 package textwatermark import ( "errors" "fmt" "image" "image/color" "image/draw" "image/gif" "image/jpeg" "image/png" "io/ioutil" "math/rand" "os" "time" "github.com/golang/freetype" ) // 水印的位置 const ( TopLeft int = iota TopRight BottomLeft BottomRight Center ) //字体路径 var Ttf string type Water struct { Pattern string //增加按时间划分的子目录：默认没有时间划分的子目录 } func (w *Water) New(SavePath, fileName string, typeface []FontInfo) error { var subPath string subPath = w.Pattern dirs, err := createDir(SavePath, subPath) if err != nil { return err } imgfile, _ := os.Open(fileName) defer imgfile.Close() _, str, err := image.DecodeConfig(imgfile) if err != nil { return err } newName := fmt.Sprintf("%s%s.%s", dirs, getRandomString(10), str) if str == "gif" { err = gifFontWater(fileName, newName, typeface) } else { err = staticFontWater(fileName, newName, str, typeface) } return err } //gif图片水印 func gifFontWater(file, name string, typeface []FontInfo) (err error) { imgfile, _ := os.Open(file) defer imgfile.Close() var err2 error gifimg2, _ := gif.DecodeAll(imgfile) gifs := make([]*image.Paletted, 0) x0 := 0 y0 := 0 yuan := 0 for k, gifimg := range gifimg2.Image { img := image.NewNRGBA(gifimg.Bounds()) if k == 0 { x0 = img.Bounds().Dx() y0 = img.Bounds().Dy() } fmt.Printf("%v, %v\n", img.Bounds().Dx(), img.Bounds().Dy()) if k == 0 && gifimg2.Image[k+1].Bounds().Dx() > x0 && gifimg2.Image[k+1].Bounds().Dy() > y0 { yuan = 1 break } if x0 == img.Bounds().Dx() && y0 == img.Bounds().Dy() { for y := 0; y < img.Bounds().Dy(); y++ { for x := 0; x < img.Bounds().Dx(); x++ { img.Set(x, y, gifimg.At(x, y)) } } img, err2 = common(img, typeface) //添加文字水印 if err2 != nil { break } //定义一个新的图片调色板img.Bounds()：使用原图的颜色域，gifimg.Palette：使用原图的调色板 p1 := image.NewPaletted(gifimg.Bounds(), gifimg.Palette) //把绘制过文字的图片添加到新的图片调色板上 draw.Draw(p1, gifimg.Bounds(), img, image.ZP, draw.Src) //把添加过文字的新调色板放入调色板slice gifs = append(gifs, p1) } else { gifs = append(gifs, gifimg) } } if yuan == 1 { return errors.New("gif: image block is out of bounds") } else { if err2 != nil { return err2 } //保存到新文件中 newfile, err := os.Create(name) if err != nil { return err } defer newfile.Close() g1 := &gif.GIF{ Image: gifs, Delay: gifimg2.Delay, LoopCount: gifimg2.LoopCount, } err = gif.EncodeAll(newfile, g1) return err } } //png,jpeg图片水印 func staticFontWater(file, name, status string, typeface []FontInfo) (err error) { //需要加水印的图片 imgfile, _ := os.Open(file) defer imgfile.Close() var staticImg image.Image if status == "png" { staticImg, _ = png.Decode(imgfile) } else { staticImg, _ = jpeg.Decode(imgfile) } img := image.NewNRGBA(staticImg.Bounds()) for y := 0; y < img.Bounds().Dy(); y++ { for x := 0; x < img.Bounds().Dx(); x++ { img.Set(x, y, staticImg.At(x, y)) } } img, err = common(img, typeface) //添加文字水印 if err != nil { return err } //保存到新文件中 newfile, err := os.Create(name) if err != nil { return err } defer newfile.Close() if status == "png" { err = png.Encode(newfile, img) } else { err = jpeg.Encode(newfile, img, &jpeg.Options{100}) } return err } //添加文字水印函数 func common(img *image.NRGBA, typeface []FontInfo) (*image.NRGBA, error) { var err2 error //拷贝一个字体文件到运行目录 fontBytes, err := ioutil.ReadFile(Ttf) if err != nil { err2 = err return nil, err2 } font, err := freetype.ParseFont(fontBytes) if err != nil { err2 = err return nil, err2 } errNum := 1 Loop: for _, t := range typeface { info := t.Message f := freetype.NewContext() f.SetDPI(108) f.SetFont(font) f.SetFontSize(t.Size) f.SetClip(img.Bounds()) f.SetDst(img) f.SetSrc(image.NewUniform(color.RGBA{R: t.R, G: t.G, B: t.B, A: t.A})) //第一行的文字 // pt := freetype.Pt(img.Bounds().Dx()-len(info)*4-20, img.Bounds().Dy()-100) first := 0 two := 0 switch int(t.Position) { case 0: first = t.Dx two = t.Dy + int(f.PointToFixed(t.Size)>>6) case 1: first = img.Bounds().Dx() - len(info)*4 - t.Dx two = t.Dy + int(f.PointToFixed(t.Size)>>6) case 2: first = t.Dx two = img.Bounds().Dy() - t.Dy case 3: first = img.Bounds().Dx() - len(info)*4 - t.Dx two = img.Bounds().Dy() - t.Dy case 4: first = (img.Bounds().Dx() - len(info)*4) / 2 two = (img.Bounds().Dy() - t.Dy) / 2 default: errNum = 0 break Loop } // fmt.Printf("%v, %v, %v\n", first, two, info) pt := freetype.Pt(first, two) _, err = f.DrawString(info, pt) if err != nil { err2 = err break } } if errNum == 0 { err2 = errors.New("坐标值不对") } return img, err2 } //定义添加的文字信息 type FontInfo struct { Size float64 //文字大小 Message string //文字内容 Position int //文字存放位置 Dx int //文字x轴留白距离 Dy int //文字y轴留白距离 R uint8 //文字颜色值RGBA中的R值 G uint8 //文字颜色值RGBA中的G值 B uint8 //文字颜色值RGBA中的B值 A uint8 //文字颜色值RGBA中的A值 } //生成图片名字 func getRandomString(lenght int) string { str := "0123456789abcdefghijklmnopqrstuvwxyz" bytes := []byte(str) bytesLen := len(bytes) result := []byte{} r := rand.New(rand.NewSource(time.Now().UnixNano())) for i := 0; i < lenght; i++ { result = append(result, bytes[r.Intn(bytesLen)]) } return string(result) } //检查并生成存放图片的目录 func createDir(SavePath, subPath string) (string, error) { var dirs string if subPath == "" { dirs = fmt.Sprintf("%s/", SavePath) } else { dirs = fmt.Sprintf("%s/%s/", SavePath, time.Now().Format(subPath)) } _, err := os.Stat(dirs) if err != nil { err = os.MkdirAll(dirs, os.ModePerm) if err != nil { return "", err } } return dirs, nil } 

 "github.com/golang/freetype" "golang.org/x/image/font" 

 draw.Draw(jpg, img.Bounds().Add(image.Pt(60, 150)), img, img.Bounds().Min, draw.Src) //截取图片的一部分 draw.Draw(jpg, img.Bounds().Add(image.Pt(435, 150)), img, img.Bounds().Min, draw.Src) //截取图片的一部分 draw.Draw(jpg, img.Bounds().Add(image.Pt(60, 610)), img, img.Bounds().Min, draw.Src) //截取图片的一部分 draw.Draw(jpg, img.Bounds().Add(image.Pt(435, 610)), img, img.Bounds().Min, draw.Src) //截取图片的一部分 

 package main import ( "flag" "fmt" "github.com/gin-gonic/gin" "github.com/golang/freetype" "github.com/nfnt/resize" "golang.org/x/image/font" "image" "image/draw" "image/png" "io/ioutil" "log" "net/http" "os" "strings" ) var ( dpi = flag.Float64("dpi", 72, "screen resolution in Dots Per Inch") fontfile = flag.String("fontfile", "/Users/zhiliao/Downloads/ffffonts/simsun.ttf", "filename of the ttf font") hinting = flag.String("hinting", "none", "none | full") size = flag.Float64("size", 30, "font size in points") spacing = flag.Float64("spacing", 1.5, "line spacing (e.g. 2 means double spaced)") wonb = flag.Bool("whiteonblack", false, "white text on a black background") ) var text = []string{ "地支：沈阳市某区某镇某街道某楼某", "姓名：王永飞", "电话：1232131231232", } func main() { file, err := os.Create("dst.jpg") if err != nil { fmt.Println(err) } defer file.Close() file1, err := os.Open("/Users/zhiliao/zhiliao/gopro/go_safly/src/qr.png") if err != nil { fmt.Println(err) } defer file1.Close() img, _ := png.Decode(file1) //尺寸 img = resize.Resize(314, 314, img, resize.Lanczos3) jpg := image.NewRGBA(image.Rect(0, 0, 827, 1169)) fontRender(jpg) draw.Draw(jpg, img.Bounds().Add(image.Pt(60, 150)), img, img.Bounds().Min, draw.Src) //截取图片的一部分 draw.Draw(jpg, img.Bounds().Add(image.Pt(435, 150)), img, img.Bounds().Min, draw.Src) //截取图片的一部分 draw.Draw(jpg, img.Bounds().Add(image.Pt(60, 610)), img, img.Bounds().Min, draw.Src) //截取图片的一部分 draw.Draw(jpg, img.Bounds().Add(image.Pt(435, 610)), img, img.Bounds().Min, draw.Src) //截取图片的一部分 png.Encode(file, jpg) } func fontRender(jpg *image.RGBA) { flag.Parse() fontBytes, err := ioutil.ReadFile(*fontfile) if err != nil { log.Println(err) return } f, err := freetype.ParseFont(fontBytes) if err != nil { log.Println(err) return } fg, bg := image.Black, image.White //ruler := color.RGBA{0xdd, 0xdd, 0xdd, 0xff} //if *wonb { // fg, bg = image.White, image.Black // ruler =
                
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