Skia Filter Quality and Scaling Metrics

include/core/SkFilterQuality.h

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkFilterQuality_DEFINED
 #define SkFilterQuality_DEFINED
 
 #include "SkTypes.h"
 
 /**
  *  Controls how much filtering to be done when scaling/transforming complex colors
  *  e.g. images
  */
 enum SkFilterQuality {
     kNone_SkFilterQuality,      //!< fastest but lowest quality, typically nearest-neighbor
     kLow_SkFilterQuality,       //!< typically bilerp
     kMedium_SkFilterQuality,    //!< typically bilerp + mipmaps for down-scaling
-    kHigh_SkFilterQuality       //!< slowest but highest quality, typically bicubic or better
+    kHigh_SkFilterQuality,      //!< slowest but highest quality, typically bicubic or better
+
+    kLast_SkFilterQuality = kHigh_SkFilterQuality
 };
 
 #endif