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/*
* Copyright 2014 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrLayerHoister_DEFINED
#define GrLayerHoister_DEFINED
#include "SkPicture.h"
#include "SkTDArray.h"
class GrAccelData;
struct GrCachedLayer;
struct SkRect;
// This class collects the layer hoisting functionality in one place.
// For each picture rendering:
// FindLayersToHoist should be called once to collect the required layers
// DrawLayers should be called once to render them
// UnlockLayers should be called once to allow the texture resources to be recycled
class GrLayerHoister {
public:
/** Find the layers in 'gpuData' that need hoisting.
@param gpuData Acceleration structure containing layer information for a picture
@param query The rectangle that is about to be drawn.
@param pullForward A gpuData->numSaveLayers -sized Boolean array indicating
which layers are to be hoisted
Return true if any layers are suitable for hoisting; false otherwise
*/
static bool FindLayersToHoist(const GrAccelData *gpuData,
const SkRect& query,
bool pullForward[]);
/** Draw the specified layers of 'picture' into either the atlas or free
floating textures.
@param picture The picture containing the layers
@param atlased The layers to be drawn into the atlas
@param nonAtlased The layers to be drawn into their own textures
*/
static void DrawLayers(const SkPicture* picture,
const SkTDArray<GrCachedLayer*>& atlased,
const SkTDArray<GrCachedLayer*>& nonAtlased);
/** Unlock all the layers associated with picture in the layer cache.
@param layerCache holder of the locked layers
@pmara picture the source of the locked layers
*/
static void UnlockLayers(GrLayerCache* layerCache, const SkPicture* picture);
};
#endif
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