Add SkMaskCache

src/core/SkMaskCache.h

+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkMaskCache_DEFINED
+#define SkMaskCache_DEFINED
+
+#include "SkBlurTypes.h"
+#include "SkCachedData.h"
+#include "SkMask.h"
+#include "SkRect.h"
+#include "SkResourceCache.h"
+#include "SkRRect.h"
+
+class SkMaskCache {
+public:
+    /**
+     * On success, return a ref to the SkCachedData that holds the pixels, and have mask
+     * already point to that memory.
+     *
+     * On failure, return NULL.
+     */
+    static SkCachedData* FindAndRef(SkScalar sigma, const SkRRect& rrect, SkBlurStyle style,
+                                    SkBlurQuality quality, SkMask* mask,
+                                    SkResourceCache* localCache = NULL);
+    static SkCachedData* FindAndRef(SkScalar sigma, const SkRect rects[], int count,
+                                    SkBlurStyle style,SkMask* mask,
+                                    SkResourceCache* localCache = NULL);
+
+    /**
+     * Add a mask and its pixel-data to the cache.
+     */
+    static void Add(SkScalar sigma, const SkRRect& rrect, SkBlurStyle style, SkBlurQuality quality,
+                    const SkMask& mask, SkCachedData* data, SkResourceCache* localCache = NULL);
+    static void Add(SkScalar sigma, const SkRect rects[], int count, SkBlurStyle style,
+                    const SkMask& mask, SkCachedData* data, SkResourceCache* localCache = NULL);
+};
+
+#endif