5199701acb
git-svn-id: http://skia.googlecode.com/svn/trunk@14172 2bbb7eff-a529-9590-31e7-b0007b416f81
74 lines
2.2 KiB
C++
74 lines
2.2 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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#include "SkPoint.h"
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#include "SkSize.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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struct TileGridInfo {
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/** Tile placement interval */
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SkISize fTileInterval;
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/** Pixel coverage overlap between adjacent tiles */
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SkISize fMargin;
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/** Offset added to device-space bounding box positions to convert
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* them to tile-grid space. This can be used to adjust the "phase"
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* of the tile grid to match probable query rectangles that will be
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* used to search into the tile grid. As long as the offset is smaller
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* or equal to the margin, there is no need to extend the domain of
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* the tile grid to prevent data loss.
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*/
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SkIPoint fOffset;
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};
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/**
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* Constructor
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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 info description of the tiling layout
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*/
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SkTileGridPicture(int width, int height, const TileGridInfo& info);
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virtual SkBBoxHierarchy* createBBoxHierarchy() const SK_OVERRIDE;
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private:
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int fXTileCount, fYTileCount;
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TileGridInfo fInfo;
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typedef SkPicture INHERITED;
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};
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class SkTileGridPictureFactory : public SkPictureFactory {
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public:
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SkTileGridPictureFactory(const SkTileGridPicture::TileGridInfo& info) : fInfo(info) { }
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virtual SkPicture* create(int width, int height) SK_OVERRIDE {
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return SkNEW_ARGS(SkTileGridPicture, (width, height, fInfo));
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}
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protected:
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SkTileGridPicture::TileGridInfo fInfo;
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private:
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typedef SkPictureFactory INHERITED;
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};
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#endif
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