1 files changed, 10 insertions, 1 deletions
diff --git a/libgo/go/image/ycbcr/ycbcr.go b/libgo/go/image/ycbcr/ycbcr.go
index cda45996df0..f2de3d6fbc5 100644
--- a/libgo/go/image/ycbcr/ycbcr.go
+++ b/libgo/go/image/ycbcr/ycbcr.go
@@ -142,7 +142,7 @@ func (p *YCbCr) Bounds() image.Rectangle {
 }
 
 func (p *YCbCr) At(x, y int) image.Color {
-	if !p.Rect.Contains(image.Point{x, y}) {
+	if !(image.Point{x, y}.In(p.Rect)) {
 		return YCbCrColor{}
 	}
 	switch p.SubsampleRatio {
@@ -169,6 +169,15 @@ func (p *YCbCr) At(x, y int) image.Color {
 	}
 }
 
+// SubImage returns an image representing the portion of the image p visible
+// through r. The returned value shares pixels with the original image.
+func (p *YCbCr) SubImage(r image.Rectangle) image.Image {
+	q := new(YCbCr)
+	*q = *p
+	q.Rect = q.Rect.Intersect(r)
+	return q
+}
+
 func (p *YCbCr) Opaque() bool {
 	return true
 }