/** @since Available in iOS 4.0 and later. */
 public CVImageBufferChromaLocation getChromaLocationBottomField() {
   if (has(CVImageBufferAttribute.ChromaLocationBottomField)) {
     CFString val = get(CVImageBufferAttribute.ChromaLocationBottomField, CFString.class);
     return CVImageBufferChromaLocation.valueOf(val);
   }
   return null;
 }
 /** @since Available in iOS 4.0 and later. */
 public CVImageBufferAttributes setChromaLocationBottomField(
     CVImageBufferChromaLocation chromaLocationBottomField) {
   set(CVImageBufferAttribute.ChromaLocationBottomField, chromaLocationBottomField.value());
   return this;
 }