add cursor image to uri convertor.

internal/utils/cursor.go

@@ -0,0 +1,40 @@
+package utils
+
+import (
+	"bytes"
+    "image"
+    "image/color"
+	"image/png"
+	"encoding/base64"
+
+	"demodesk/neko/internal/types"
+)
+
+func GetCursorImageURI(cursor *types.CursorImage) (string, error) {
+	width := int(cursor.Width)
+	height := int(cursor.Height)
+	pixels := cursor.Pixels
+
+	img := image.NewRGBA(image.Rect(0, 0, width, height))
+	for row := 0; row < height; row++ {
+		for col := 0; col < width; col++ {
+			pos := ((row * height) + col) * 8
+
+			img.SetRGBA(col, row, color.RGBA{
+				A: pixels[pos+3],
+				R: pixels[pos+2],
+				G: pixels[pos+1],
+				B: pixels[pos+0],
+			})
+		}
+	}
+
+    out := new(bytes.Buffer)
+    err := png.Encode(out, img)
+	if err != nil {
+		return "", err
+	}
+
+	uri := "data:image/png;base64," + base64.StdEncoding.EncodeToString(out.Bytes())
+	return uri, nil
+}