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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 CCLayerTreeHostCommon_h
#define CCLayerTreeHostCommon_h
#include "base/memory/ref_counted.h"
#include "cc/scoped_ptr_vector.h"
#include "IntRect.h"
#include "IntSize.h"
#include <public/WebTransformationMatrix.h>
#include <wtf/Vector.h>
namespace cc {
class LayerImpl;
class LayerSorter;
class Layer;
class LayerTreeHostCommon {
public:
static IntRect calculateVisibleRect(const IntRect& targetSurfaceRect, const IntRect& layerBoundRect, const WebKit::WebTransformationMatrix&);
static void calculateDrawTransforms(Layer* rootLayer, const IntSize& deviceViewportSize, float deviceScaleFactor, int maxTextureSize, std::vector<scoped_refptr<Layer> >& renderSurfaceLayerList);
static void calculateDrawTransforms(LayerImpl* rootLayer, const IntSize& deviceViewportSize, float deviceScaleFactor, LayerSorter*, int maxTextureSize, std::vector<LayerImpl*>& renderSurfaceLayerList);
// Performs hit testing for a given renderSurfaceLayerList.
static LayerImpl* findLayerThatIsHitByPoint(const IntPoint& screenSpacePoint, std::vector<LayerImpl*>& renderSurfaceLayerList);
template<typename LayerType> static bool renderSurfaceContributesToTarget(LayerType*, int targetSurfaceLayerID);
// Returns a layer with the given id if one exists in the subtree starting
// from the given root layer (including mask and replica layers).
template<typename LayerType> static LayerType* findLayerInSubtree(LayerType* rootLayer, int layerId);
static Layer* getChildAsRawPtr(const std::vector<scoped_refptr<Layer> >& children, size_t index)
{
return children[index].get();
}
static LayerImpl* getChildAsRawPtr(const ScopedPtrVector<LayerImpl>& children, size_t index)
{
return children[index];
}
struct ScrollUpdateInfo {
int layerId;
IntSize scrollDelta;
};
};
struct ScrollAndScaleSet {
ScrollAndScaleSet();
~ScrollAndScaleSet();
Vector<LayerTreeHostCommon::ScrollUpdateInfo> scrolls;
float pageScaleDelta;
};
template<typename LayerType>
bool LayerTreeHostCommon::renderSurfaceContributesToTarget(LayerType* layer, int targetSurfaceLayerID)
{
// A layer will either contribute its own content, or its render surface's content, to
// the target surface. The layer contributes its surface's content when both the
// following are true:
// (1) The layer actually has a renderSurface, and
// (2) The layer's renderSurface is not the same as the targetSurface.
//
// Otherwise, the layer just contributes itself to the target surface.
return layer->renderSurface() && layer->id() != targetSurfaceLayerID;
}
template<typename LayerType>
LayerType* LayerTreeHostCommon::findLayerInSubtree(LayerType* rootLayer, int layerId)
{
if (rootLayer->id() == layerId)
return rootLayer;
if (rootLayer->maskLayer() && rootLayer->maskLayer()->id() == layerId)
return rootLayer->maskLayer();
if (rootLayer->replicaLayer() && rootLayer->replicaLayer()->id() == layerId)
return rootLayer->replicaLayer();
for (size_t i = 0; i < rootLayer->children().size(); ++i) {
if (LayerType* found = findLayerInSubtree(getChildAsRawPtr(rootLayer->children(), i), layerId))
return found;
}
return 0;
}
} // namespace cc
#endif
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