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 /*

  * Copyright 2012 Google Inc.

  *

  * Use of this source code is governed by a BSD-style license that can be

  * found in the LICENSE file.

  */

 #ifndef SkTileGridPicture_DEFINED

 #define SkTileGridPicture_DEFINED

 #include "SkPicture.h"

 #include "SkPoint.h"

 #include "SkSize.h"

 /**

  * Subclass of SkPicture that override the behavior of the

  * kOptimizeForClippedPlayback_RecordingFlag by creating an SkTileGrid

  * structure rather than an R-Tree. The tile grid has lower recording

  * and playback costs, but is less effective at eliminating extraneous

  * primitives for arbitrary query rectangles. It is most effective for

  * tiled playback when the tile structure is known at record time.

  */

 class SK_API SkTileGridPicture : public SkPicture {

 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;

     };

     /**

      * Constructor

      * @param width recording canvas width in device pixels

      * @param height recording canvas height in device pixels

      * @param info description of the tiling layout

      */

     SkTileGridPicture(int width, int height, const TileGridInfo& info);

     virtual SkBBoxHierarchy* createBBoxHierarchy() const SK_OVERRIDE;

 private:

     int fXTileCount, fYTileCount;

     TileGridInfo fInfo;

 };

 #endif