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/*
* Copyright (C) 2011 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef CCLayerSorter_h
#define CCLayerSorter_h
#include "FloatPoint3D.h"
#include "FloatQuad.h"
#include "FloatRect.h"
#include "cc/CCLayerImpl.h"
#include <wtf/HashMap.h>
#include <wtf/Noncopyable.h>
#include <wtf/Vector.h>
namespace WebKit {
class WebTransformationMatrix;
}
namespace WebCore {
class CCLayerSorter {
WTF_MAKE_NONCOPYABLE(CCLayerSorter);
public:
CCLayerSorter() : m_zRange(0) { }
typedef Vector<CCLayerImpl*> LayerList;
void sort(LayerList::iterator first, LayerList::iterator last);
// Holds various useful properties derived from a layer's 3D outline.
struct LayerShape {
LayerShape() { }
LayerShape(float width, float height, const WebKit::WebTransformationMatrix& drawTransform);
float layerZFromProjectedPoint(const FloatPoint&) const;
FloatPoint3D layerNormal;
FloatPoint3D transformOrigin;
FloatQuad projectedQuad;
FloatRect projectedBounds;
};
enum ABCompareResult {
ABeforeB,
BBeforeA,
None
};
static ABCompareResult checkOverlap(LayerShape*, LayerShape*, float zThreshold, float& weight);
private:
struct GraphEdge;
struct GraphNode {
explicit GraphNode(CCLayerImpl* cclayer) : layer(cclayer), incomingEdgeWeight(0) { }
CCLayerImpl* layer;
LayerShape shape;
Vector<GraphEdge*> incoming;
Vector<GraphEdge*> outgoing;
float incomingEdgeWeight;
};
struct GraphEdge {
GraphEdge(GraphNode* fromNode, GraphNode* toNode, float weight) : from(fromNode), to(toNode), weight(weight) { };
GraphNode* from;
GraphNode* to;
float weight;
};
typedef Vector<GraphNode> NodeList;
typedef Vector<GraphEdge> EdgeList;
NodeList m_nodes;
EdgeList m_edges;
float m_zRange;
typedef HashMap<GraphEdge*, GraphEdge*> EdgeMap;
EdgeMap m_activeEdges;
void createGraphNodes(LayerList::iterator first, LayerList::iterator last);
void createGraphEdges();
void removeEdgeFromList(GraphEdge*, Vector<GraphEdge*>&);
};
}
#endif
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