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// Copyright 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CCLayerSorter_h
#define CCLayerSorter_h
#include "base/basictypes.h"
#include "base/hash_tables.h"
#include "CCLayerImpl.h"
#include "FloatPoint3D.h"
#include "FloatQuad.h"
#include "FloatRect.h"
#if defined(COMPILER_GCC)
namespace cc
{
struct GraphEdge;
};
namespace BASE_HASH_NAMESPACE {
template<>
struct hash<cc::GraphEdge*> {
size_t operator()(cc::GraphEdge* ptr) const {
return hash<size_t>()(reinterpret_cast<size_t>(ptr));
}
};
} // namespace BASE_HASH_NAMESPACE
#endif // COMPILER
namespace WebKit {
class WebTransformationMatrix;
}
namespace cc {
struct GraphEdge;
// 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;
};
struct GraphNode {
explicit GraphNode(LayerImpl* layerImpl);
~GraphNode();
LayerImpl* layer;
LayerShape shape;
std::vector<GraphEdge*> incoming;
std::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;
};
class LayerSorter {
public:
LayerSorter();
~LayerSorter();
typedef std::vector<LayerImpl*> LayerList;
void sort(LayerList::iterator first, LayerList::iterator last);
enum ABCompareResult {
ABeforeB,
BBeforeA,
None
};
static ABCompareResult checkOverlap(LayerShape*, LayerShape*, float zThreshold, float& weight);
private:
typedef std::vector<GraphNode> NodeList;
typedef std::vector<GraphEdge> EdgeList;
NodeList m_nodes;
EdgeList m_edges;
float m_zRange;
typedef base::hash_map<GraphEdge*, GraphEdge*> EdgeMap;
EdgeMap m_activeEdges;
void createGraphNodes(LayerList::iterator first, LayerList::iterator last);
void createGraphEdges();
void removeEdgeFromList(GraphEdge*, std::vector<GraphEdge*>&);
DISALLOW_COPY_AND_ASSIGN(LayerSorter);
};
}
#endif
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