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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"
/**
* 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:
/**
* Constructor
* @param tileWidth horizontal stride between consecutive tiles
* @param tileHeight vertical stride between consecutive tiles
* @param width recording canvas width in device pixels
* @param height recording canvas height in device pixels
* @param borderPixels pixels of overlap between adjacent tiles. Set this
* value to match the border overlap that is applied to tiles by user
* code. Properly setting this value will help improve performance
* when performing tile-aligned playbacks with query regions that
* match tile bounds outset by borderPixels pixels. Such outsets
* are often used to prevent filtering artifacts at tile boundaries.
*/
SkTileGridPicture(int tileWidth, int tileHeight, int width, int height, int borderPixels = 0);
virtual SkBBoxHierarchy* createBBoxHierarchy() const SK_OVERRIDE;
private:
int fTileWidth, fTileHeight, fXTileCount, fYTileCount, fBorderPixels;
};
#endif
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