Cache blur mask for rects which can not break into nine-patch

src/core/SkMaskCache.h

Index: src/core/SkMaskCache.h
diff --git a/src/core/SkMaskCache.h b/src/core/SkMaskCache.h
index f98387b2067dd03745ba2eb9ffaf5cc49d56ff5c..2cfb971dde14a967a8699ad512812759c1736799 100644
--- a/src/core/SkMaskCache.h
+++ b/src/core/SkMaskCache.h
@@ -39,6 +39,25 @@ public:
     static void Add(SkScalar sigma, SkBlurStyle style, SkBlurQuality quality,
                     const SkRect rects[], int count, const SkMask& mask, SkCachedData* data,
                     SkResourceCache* localCache = NULL);
+
+    /**
+     * On success, set mask with cached value, allocate memory for mask->fImage,
+     * copy pixels from SkCachedData in the cache to mask->fImage, then return true.
+     *
+     * On failure, return false, no memory allocated for mask->fImage.
+     */
+    static bool FindAndCopy(SkScalar sigma, SkBlurStyle style, SkBlurQuality quality,
+                            const SkRRect& rrect, SkMask* mask);
+    static bool FindAndCopy(SkScalar sigma, SkBlurStyle style, SkBlurQuality quality,
+                            const SkRect rects[], int count, SkMask* mask);
+
+    /**
+     * Create a new SkCachedData, copy pixels from mask.fImage to it, then add it into cache.
+     */
+    static void AddAndCopy(SkScalar sigma, SkBlurStyle style, SkBlurQuality quality,
+                           const SkRRect& rrect, const SkMask& mask);
+    static void AddAndCopy(SkScalar sigma, SkBlurStyle style, SkBlurQuality quality,
+                           const SkRect rects[], int count, const SkMask& mask);
 };
 
 #endif