Support decode blurhash

actions/decode.go

@@ -0,0 +1,41 @@
+package actions
+
+import (
+	"bytes"
+	"encoding/base64"
+	"errors"
+	"fmt"
+	"image/jpeg"
+	"math"
+
+	"github.com/bbrks/go-blurhash"
+	"github.com/urfave/cli/v2"
+)
+
+func Decode(ctx *cli.Context) error {
+	bh := ctx.String("blurhash")
+
+	if bh != "" {
+		width := ctx.Float64("width")
+		height := ctx.Float64("height")
+
+		ratio := math.Min(32/float64(width), 32/float64(height))
+
+		img, err := blurhash.Decode(bh, int(width*ratio), int(height*ratio), 1)
+		if err != nil {
+			return err
+		}
+
+		xsb := new(bytes.Buffer)
+		jpeg.Encode(xsb, img, &jpeg.Options{Quality: 95})
+		fmt.Printf("data:image/jpeg;charset=utf-8;base64,%v", base64.StdEncoding.EncodeToString(xsb.Bytes()))
+
+	}
+
+	th := ctx.String("thumbhash")
+	if th != "" {
+		return errors.New("not support yet")
+	}
+
+	return nil
+}

main.go

@@ -50,6 +50,27 @@ func main() {
 					},
 				},
 			},
+			{
+				Name:    "decode",
+				Aliases: []string{"d"},
+				Action:  actions.Decode,
+				Flags: []cli.Flag{
+					&cli.StringFlag{
+						Name:  "blurhash",
+						Value: "",
+					},
+					&cli.StringFlag{
+						Name:  "thumbhash",
+						Value: "",
+					},
+					&cli.Float64Flag{
+						Name: "width",
+					},
+					&cli.Float64Flag{
+						Name: "height",
+					},
+				},
+			},
 			{
 				Name:    "version",
 				Aliases: []string{"v"},