Added scaled ImageSource.

ui/imagesource.go

@@ -3,6 +3,7 @@ package ui
 import (
 	"image"
 
+	"github.com/nfnt/resize"
 	"opslag.de/schobers/zntg"
 )
 
@@ -45,3 +46,25 @@ func (s ImageSourceResource) CreateImage() (image.Image, error) {
 	}
 	return value.(image.Image), nil
 }
+
+func ImageSourceFromResources(res Resources, name string) ImageSourceResource {
+	return ImageSourceResource{Resources: res, Name: name}
+}
+
+func Scaled(source ImageSource, width, height int) ImageSource {
+	return scaledImageSource{ImageSource: source, width: width, height: height}
+}
+
+type scaledImageSource struct {
+	ImageSource
+
+	width, height int
+}
+
+func (s scaledImageSource) CreateImage() (image.Image, error) {
+	im, err := s.ImageSource.CreateImage()
+	if err != nil {
+		return nil, err
+	}
+	return resize.Resize(uint(s.width), uint(s.height), im, resize.Bicubic), nil
+}