Golang如何开发图片水印生成工具

img, _ := jpeg.Decode(file)
bounds := img.Bounds()
newImg := image.NewRGBA(bounds)
draw.Draw(newImg, bounds, img, image.Point{0, 0}, draw.Src)
<p>// 设置字体大小和颜色
fontSize := 24.0
color := color.RGBA{R: 255, G: 255, B: 255, A: 100}</p><p>// 使用 inconsolata 字体
ttfFont, _ := truetype.Parse(inconsolata.Regular8x16)
face := truetype.NewFace(ttfFont, &truetype.Options{Size: fontSize})</p><p>point := fixed.Point26_6{
X: fixed.I(bounds.Dx() - 150),
Y: fixed.I(bounds.Dy() - 50),
}
font.DrawString(newImg, "Watermark", face, point, font.Drawer{Dst: newImg, Src: image.NewUniform(color)})</p><p>out, _ := os.Create("output.jpg")
jpeg.Encode(out, newImg, nil)

logo, _, _ := image.Decode(logoFile)
logoBounds := logo.Bounds()
smallLogo := image.NewRGBA(image.Rect(0, 0, 100, int(100*float64(logoBounds.Dy())/float64(logoBounds.Dx()))))
draw.NearestNeighbor.Scale(smallLogo, smallLogo.Bounds(), logo, logo.Bounds(), draw.Src, nil)
<p>// 贴到右下角
x, y := bounds.Dx()-smallLogo.Bounds().Dx()-10, bounds.Dy()-smallLogo.Bounds().Dy()-10
draw.Draw(newImg, image.Rect(x, y, x+smallLogo.Bounds().Dx(), y+smallLogo.Bounds().Dy()), smallLogo, image.Point{0,0}, draw.Over)

go run main.go -input photo.jpg -text "Confidential" -pos bottom-right -alpha 128