move Place

src/utils/image.go

@@ -0,0 +1,56 @@
+package utils
+
+import (
+	"errors"
+	"github.com/nfnt/resize"
+	"golang.org/x/image/bmp"
+	"image"
+	"image/gif"
+	"image/jpeg"
+	"image/png"
+	"io"
+	"os"
+)
+
+func GenSmallImage(src, dst string) error {
+	fIn, _ := os.Open(src)
+	defer fIn.Close()
+
+	fOut, _ := os.Create(dst)
+	defer fOut.Close()
+
+	if err := scale(fIn, fOut, 0, 0, 0); err != nil {
+		return err
+	}
+	return nil
+}
+
+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 / 2
+		height = origin.Bounds().Max.Y / 2
+	}
+	if quality == 0 {
+		quality = 25
+	}
+	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
+}