Staging for cleanup of SkPicture-related headers

include/core/SkBBHFactory.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 SkBBHFactory_DEFINED
+#define SkBBHFactory_DEFINED
+
+#include "SkSize.h"
+#include "SkPoint.h"
+
+class SkBBoxHierarchy;
+
+class SkBBHFactory {
+public:
+    /**
+     *  Allocate a new SkBBoxHierarchy. Return NULL on failure.
+     */
+    virtual SkBBoxHierarchy* operator()(int width, int height) const = 0;
+    virtual ~SkBBHFactory() {};
+};
+
+class SkQuadTreeFactory : public SkBBHFactory {
+public:
+    virtual SkBBoxHierarchy* operator()(int width, int height) const SK_OVERRIDE;
+private:
+    typedef SkBBHFactory INHERITED;
+};
+
+
+class SkRTreeFactory : public SkBBHFactory {
+public:
+    virtual SkBBoxHierarchy* operator()(int width, int height) const SK_OVERRIDE;
+private:
+    typedef SkBBHFactory INHERITED;
+};
+
+class SkTileGridFactory : public SkBBHFactory {
+public:
+    struct TileGridInfo {
+        /** Tile placement interval */
+        SkISize  fTileInterval;
+
+        /** Pixel coverage overlap between adjacent tiles */
+        SkISize  fMargin;
+
+        /** Offset added to device-space bounding box positions to convert
+          * them to tile-grid space. This can be used to adjust the "phase"
+          * of the tile grid to match probable query rectangles that will be
+          * used to search into the tile grid. As long as the offset is smaller
+          * or equal to the margin, there is no need to extend the domain of
+          * the tile grid to prevent data loss.
+          */
+        SkIPoint fOffset;
+    };
+
+    SkTileGridFactory(const TileGridInfo& info) : fInfo(info) { }
+
+    virtual SkBBoxHierarchy* operator()(int width, int height) const SK_OVERRIDE;
+
+private:
+    TileGridInfo fInfo;
+
+    typedef SkBBHFactory INHERITED;
+};
+
+#endif