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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;
class GrReplacements;
struct SkRect;
class GrHoistedLayer {
public:
const SkPicture* fPicture;
GrCachedLayer* fLayer;
SkIPoint fOffset;
SkMatrix fPreMat;
SkMatrix fLocalMat;
};
// 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 'topLevelPicture' that need hoisting. Note that the discovered
layers can be inside nested sub-pictures.
@param context Owner of the layer cache (the source of new layers)
@param topLevelPicture The top-level picture that is about to be rendered
@param query The rectangle that is about to be drawn.
@param atlased Out parameter storing the layers that should be hoisted to the atlas
@param nonAtlased Out parameter storing the layers that should be hoisted stand alone
@param recycled Out parameter storing layers that need hoisting but not rendering
Return true if any layers are suitable for hoisting; false otherwise
*/
static bool FindLayersToHoist(GrContext* context,
const SkPicture* topLevelPicture,
const SkRect& query,
SkTDArray<GrHoistedLayer>* atlased,
SkTDArray<GrHoistedLayer>* nonAtlased,
SkTDArray<GrHoistedLayer>* recycled);
/** Draw the specified layers into either the atlas or free floating textures.
@param context Owner of the layer cache (and thus the layers)
@param atlased The layers to be drawn into the atlas
@param nonAtlased The layers to be drawn into their own textures
@param recycled Layers that don't need rendering but do need to go into the
replacements object
@param replacements The replacement structure to fill in with the rendered layer info
*/
static void DrawLayers(GrContext* context,
const SkTDArray<GrHoistedLayer>& atlased,
const SkTDArray<GrHoistedLayer>& nonAtlased,
const SkTDArray<GrHoistedLayer>& recycled,
GrReplacements* replacements);
/** Unlock unneeded layers in the layer cache.
@param context Owner of the layer cache (and thus the layers)
@param atlased Unneeded layers in the atlas
@param nonAtlased Unneeded layers in their own textures
@param recycled Unneeded layers that did not require rendering
*/
static void UnlockLayers(GrContext* context,
const SkTDArray<GrHoistedLayer>& atlased,
const SkTDArray<GrHoistedLayer>& nonAtlased,
const SkTDArray<GrHoistedLayer>& recycled);
};
#endif
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