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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 CC_LAYER_TREE_HOST_COMMON_H_
#define CC_LAYER_TREE_HOST_COMMON_H_
#include "base/memory/ref_counted.h"
#include "cc/cc_export.h"
#include "cc/scoped_ptr_vector.h"
#include "ui/gfx/rect.h"
#include "ui/gfx/transform.h"
#include "ui/gfx/vector2d.h"
namespace cc {
class LayerImpl;
class Layer;
class CC_EXPORT LayerTreeHostCommon {
public:
static gfx::Rect calculateVisibleRect(const gfx::Rect& targetSurfaceRect, const gfx::Rect& layerBoundRect, const gfx::Transform&);
static void calculateDrawProperties(Layer* rootLayer, const gfx::Size& deviceViewportSize, float deviceScaleFactor, float pageScaleFactor, int maxTextureSize, bool canUseLCDText, std::vector<scoped_refptr<Layer> >& renderSurfaceLayerList);
static void calculateDrawProperties(LayerImpl* rootLayer, const gfx::Size& deviceViewportSize, float deviceScaleFactor, float pageScaleFactor, int maxTextureSize, bool canUseLCDText, std::vector<LayerImpl*>& renderSurfaceLayerList, bool updateTilePriorities);
// Performs hit testing for a given renderSurfaceLayerList.
static LayerImpl* findLayerThatIsHitByPoint(const gfx::PointF& screenSpacePoint, const std::vector<LayerImpl*>& renderSurfaceLayerList);
static LayerImpl* findLayerThatIsHitByPointInTouchHandlerRegion(const gfx::PointF& screenSpacePoint, const std::vector<LayerImpl*>& renderSurfaceLayerList);
static bool layerHasTouchEventHandlersAt(const gfx::PointF& screenSpacePoint, LayerImpl* layerImpl);
template<typename LayerType> static bool renderSurfaceContributesToTarget(LayerType*, int targetSurfaceLayerID);
template<class Function, typename LayerType> static void callFunctionForSubtree(LayerType* rootLayer);
// 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;
gfx::Vector2d scrollDelta;
};
};
struct CC_EXPORT ScrollAndScaleSet {
ScrollAndScaleSet();
~ScrollAndScaleSet();
std::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;
}
template<class Function, typename LayerType>
void LayerTreeHostCommon::callFunctionForSubtree(LayerType* rootLayer)
{
Function()(rootLayer);
if (LayerType* maskLayer = rootLayer->maskLayer())
Function()(maskLayer);
if (LayerType* replicaLayer = rootLayer->replicaLayer()) {
Function()(replicaLayer);
if (LayerType* maskLayer = replicaLayer->maskLayer())
Function()(maskLayer);
}
for (size_t i = 0; i < rootLayer->children().size(); ++i)
callFunctionForSubtree<Function>(getChildAsRawPtr(rootLayer->children(), i));
}
} // namespace cc
#endif // CC_LAYER_TREE_HOST_COMMON_H_
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