1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/skia/trunk/include/core/SkTileGridPicture.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,56 @@
1.4 +/*
1.5 + * Copyright 2012 Google Inc.
1.6 + *
1.7 + * Use of this source code is governed by a BSD-style license that can be
1.8 + * found in the LICENSE file.
1.9 + */
1.10 +
1.11 +#ifndef SkTileGridPicture_DEFINED
1.12 +#define SkTileGridPicture_DEFINED
1.13 +
1.14 +#include "SkPicture.h"
1.15 +#include "SkPoint.h"
1.16 +#include "SkSize.h"
1.17 +
1.18 +/**
1.19 + * Subclass of SkPicture that override the behavior of the
1.20 + * kOptimizeForClippedPlayback_RecordingFlag by creating an SkTileGrid
1.21 + * structure rather than an R-Tree. The tile grid has lower recording
1.22 + * and playback costs, but is less effective at eliminating extraneous
1.23 + * primitives for arbitrary query rectangles. It is most effective for
1.24 + * tiled playback when the tile structure is known at record time.
1.25 + */
1.26 +class SK_API SkTileGridPicture : public SkPicture {
1.27 +public:
1.28 + struct TileGridInfo {
1.29 + /** Tile placement interval */
1.30 + SkISize fTileInterval;
1.31 +
1.32 + /** Pixel coverage overlap between adjacent tiles */
1.33 + SkISize fMargin;
1.34 +
1.35 + /** Offset added to device-space bounding box positions to convert
1.36 + * them to tile-grid space. This can be used to adjust the "phase"
1.37 + * of the tile grid to match probable query rectangles that will be
1.38 + * used to search into the tile grid. As long as the offset is smaller
1.39 + * or equal to the margin, there is no need to extend the domain of
1.40 + * the tile grid to prevent data loss.
1.41 + */
1.42 + SkIPoint fOffset;
1.43 + };
1.44 + /**
1.45 + * Constructor
1.46 + * @param width recording canvas width in device pixels
1.47 + * @param height recording canvas height in device pixels
1.48 + * @param info description of the tiling layout
1.49 + */
1.50 + SkTileGridPicture(int width, int height, const TileGridInfo& info);
1.51 +
1.52 + virtual SkBBoxHierarchy* createBBoxHierarchy() const SK_OVERRIDE;
1.53 +
1.54 +private:
1.55 + int fXTileCount, fYTileCount;
1.56 + TileGridInfo fInfo;
1.57 +};
1.58 +
1.59 +#endif
