'commit'

dsSupport/Test/CutPhotoTest/CutPhotoTest.go

@@ -0,0 +1,29 @@
+package main
+
+import (
+	"dsSupport/Utils/ImageUtil"
+	"fmt"
+	"os"
+	"strings"
+)
+
+func main() {
+	//源图片
+	src := "g:/IMG_20200512_114233.jpg"
+	//目标图片名称
+	dst := strings.Replace(src, ".", "_small.", 1)
+	fmt.Println("src=", src, " dst=", dst)
+
+	//打开源文件
+	fIn, _ := os.Open(src)
+	defer fIn.Close()
+	//创建目标文件
+	fOut, _ := os.Create(dst)
+	defer fOut.Close()
+
+	//缩放
+	err := ImageUtil.Scale(fIn, fOut, 800, 600, 100)
+	if err != nil {
+		panic(err)
+	}
+}

dsSupport/Utils/ImageUtil/ImageUtil.go

@@ -0,0 +1,91 @@
+package ImageUtil
+
+import (
+	"errors"
+	"github.com/nfnt/resize"
+	"golang.org/x/image/bmp"
+	"image"
+	"image/gif"
+	"image/jpeg"
+	"image/png"
+	"io"
+)
+
+/*
+* 图片裁剪
+* 入参:
+* 规则:如果精度为0则精度保持不变
+*
+* 返回:error
+ */
+func Clip(in io.Reader, out io.Writer, x0, y0, x1, y1, quality int) error {
+	origin, fm, err := image.Decode(in)
+	if err != nil {
+		return err
+	}
+
+	switch fm {
+	case "jpeg":
+		img := origin.(*image.YCbCr)
+		subImg := img.SubImage(image.Rect(x0, y0, x1, y1)).(*image.YCbCr)
+		return jpeg.Encode(out, subImg, &jpeg.Options{quality})
+	case "png":
+		switch origin.(type) {
+		case *image.NRGBA:
+			img := origin.(*image.NRGBA)
+			subImg := img.SubImage(image.Rect(x0, y0, x1, y1)).(*image.NRGBA)
+			return png.Encode(out, subImg)
+		case *image.RGBA:
+			img := origin.(*image.RGBA)
+			subImg := img.SubImage(image.Rect(x0, y0, x1, y1)).(*image.RGBA)
+			return png.Encode(out, subImg)
+		}
+	case "gif":
+		img := origin.(*image.Paletted)
+		subImg := img.SubImage(image.Rect(x0, y0, x1, y1)).(*image.Paletted)
+		return gif.Encode(out, subImg, &gif.Options{})
+	case "bmp":
+		img := origin.(*image.RGBA)
+		subImg := img.SubImage(image.Rect(x0, y0, x1, y1)).(*image.RGBA)
+		return bmp.Encode(out, subImg)
+	default:
+		return errors.New("ERROR FORMAT")
+	}
+	return nil
+}
+
+/*
+* 缩略图生成
+* 入参:
+* 规则: 如果width 或 hight其中有一个为0，则大小不变 如果精度为0则精度保持不变
+* 矩形坐标系起点是左上
+* 返回:error
+ */
+func Scale(in io.Reader, out io.Writer, width, height, quality int) error {
+	origin, fm, err := image.Decode(in)
+	if err != nil {
+		return err
+	}
+	if width == 0 || height == 0 {
+		width = origin.Bounds().Max.X
+		height = origin.Bounds().Max.Y
+	}
+	if quality == 0 {
+		quality = 100
+	}
+	canvas := resize.Thumbnail(uint(width), uint(height), origin, resize.Lanczos3)
+
+	switch fm {
+	case "jpeg":
+		return jpeg.Encode(out, canvas, &jpeg.Options{quality})
+	case "png":
+		return png.Encode(out, canvas)
+	case "gif":
+		return gif.Encode(out, canvas, &gif.Options{})
+	case "bmp":
+		return bmp.Encode(out, canvas)
+	default:
+		return errors.New("ERROR FORMAT")
+	}
+	return nil
+}

dsSupport/go.mod

@@ -10,8 +10,10 @@ require (
 	github.com/minio/minio-go/v6 v6.0.57
 	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
 	github.com/modern-go/reflect2 v1.0.1 // indirect
+	github.com/nfnt/resize v0.0.0-20180221191011-83c6a9932646
 	github.com/robfig/cron/v3 v3.0.0
 	github.com/satori/go.uuid v1.2.0
+	golang.org/x/image v0.0.0-20200618115811-c13761719519
 	golang.org/x/sys v0.0.0-20200625212154-ddb9806d33ae // indirect
 	google.golang.org/protobuf v1.25.0 // indirect
 	gopkg.in/ini.v1 v1.57.0

dsSupport/go.sum

@@ -71,6 +71,8 @@ github.com/modern-go/reflect2 v0.0.0-20180701023420-4b7aa43c6742 h1:Esafd1046DLD
 github.com/modern-go/reflect2 v0.0.0-20180701023420-4b7aa43c6742/go.mod h1:bx2lNnkwVCuqBIxFjflWJWanXIb3RllmbCylyMrvgv0=
 github.com/modern-go/reflect2 v1.0.1 h1:9f412s+6RmYXLWZSEzVVgPGK7C2PphHj5RJrvfx9AWI=
 github.com/modern-go/reflect2 v1.0.1/go.mod h1:bx2lNnkwVCuqBIxFjflWJWanXIb3RllmbCylyMrvgv0=
+github.com/nfnt/resize v0.0.0-20180221191011-83c6a9932646 h1:zYyBkD/k9seD2A7fsi6Oo2LfFZAehjjQMERAvZLEDnQ=
+github.com/nfnt/resize v0.0.0-20180221191011-83c6a9932646/go.mod h1:jpp1/29i3P1S/RLdc7JQKbRpFeM1dOBd8T9ki5s+AY8=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/prometheus/client_model v0.0.0-20190812154241-14fe0d1b01d4/go.mod h1:xMI15A0UPsDsEKsMN9yxemIoYk6Tm2C1GtYGdfGttqA=
 github.com/robfig/cron/v3 v3.0.0 h1:kQ6Cb7aHOHTSzNVNEhmp8EcWKLb4CbiMW9h9VyIhO4E=
@@ -92,6 +94,8 @@ golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACk
 golang.org/x/crypto v0.0.0-20190513172903-22d7a77e9e5f h1:R423Cnkcp5JABoeemiGEPlt9tHXFfw5kvc0yqlxRPWo=
 golang.org/x/crypto v0.0.0-20190513172903-22d7a77e9e5f/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
+golang.org/x/image v0.0.0-20200618115811-c13761719519 h1:1e2ufUJNM3lCHEY5jIgac/7UTjd6cgJNdatjPdFWf34=
+golang.org/x/image v0.0.0-20200618115811-c13761719519/go.mod h1:FeLwcggjj3mMvU+oOTbSwawSJRM1uh48EjtB4UJZlP0=
 golang.org/x/lint v0.0.0-20181026193005-c67002cb31c3/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE=
 golang.org/x/lint v0.0.0-20190227174305-5b3e6a55c961/go.mod h1:wehouNa3lNwaWXcvxsM5YxQ5yQlVC4a0KAMCusXpPoU=
 golang.org/x/lint v0.0.0-20190313153728-d0100b6bd8b3/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc=