8d84b8f420
git-svn-id: http://skia.googlecode.com/svn/trunk@7686 2bbb7eff-a529-9590-31e7-b0007b416f81
43 lines
1.7 KiB
C++
43 lines
1.7 KiB
C++
/*
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* Copyright 2012 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef SkTileGridPicture_DEFINED
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#define SkTileGridPicture_DEFINED
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#include "SkPicture.h"
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/**
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* Subclass of SkPicture that override the behavior of the
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* kOptimizeForClippedPlayback_RecordingFlag by creating an SkTileGrid
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* structure rather than an R-Tree. The tile grid has lower recording
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* and playback costs, but is less effective at eliminating extraneous
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* primitives for arbitrary query rectangles. It is most effective for
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* tiled playback when the tile structure is known at record time.
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*/
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class SK_API SkTileGridPicture : public SkPicture {
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public:
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/**
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* Constructor
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* @param tileWidth horizontal stride between consecutive tiles
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* @param tileHeight vertical stride between consecutive tiles
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* @param width recording canvas width in device pixels
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* @param height recording canvas height in device pixels
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* @param borderPixels pixels of overlap between adjacent tiles. Set this
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* value to match the border overlap that is applied to tiles by user
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* code. Properly setting this value will help improve performance
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* when performing tile-aligned playbacks with query regions that
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* match tile bounds outset by borderPixels pixels. Such outsets
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* are often used to prevent filtering artifacts at tile boundaries.
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*/
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SkTileGridPicture(int tileWidth, int tileHeight, int width, int height, int borderPixels = 0);
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virtual SkBBoxHierarchy* createBBoxHierarchy() const SK_OVERRIDE;
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private:
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int fTileWidth, fTileHeight, fXTileCount, fYTileCount, fBorderPixels;
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};
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#endif
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