Add functions for rotate and timestamp

image/image.go

@@ -0,0 +1,40 @@
+package image
+
+import (
+	"fmt"
+	"image"
+	"image/color"
+	"image/draw"
+	"time"
+
+	"github.com/anthonynsimon/bild/transform"
+	"github.com/pbnjay/pixfont"
+)
+
+func Rotate(img image.Image, angle int) image.Image {
+	switch angle {
+	case 90:
+		img = transform.Rotate(img, 90, &transform.RotationOptions{ResizeBounds: true})
+	case 180:
+		img = transform.Rotate(img, 180, &transform.RotationOptions{ResizeBounds: true})
+	case 270:
+		img = transform.Rotate(img, 270, &transform.RotationOptions{ResizeBounds: true})
+	}
+
+	return img
+}
+
+func Timestamp(img image.Image, format string) (image.Image, error) {
+	if format == "" {
+		format = "2006-01-02 15:04:05"
+	}
+
+	dimg, ok := img.(draw.Image)
+	if !ok {
+		return img, fmt.Errorf("camera: %T is not a drawable image type", img)
+	}
+
+	pixfont.DrawString(dimg, 10, 10, time.Now().Format(format), color.White)
+
+	return dimg, nil
+}