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/*
* Copyright (C) 2012 Apple 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 COMPUTER, INC. ``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 COMPUTER, INC. OR
* 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 LayoutGeometryMap_h
#define LayoutGeometryMap_h
#include "core/CoreExport.h"
#include "core/layout/LayoutGeometryMapStep.h"
#include "core/layout/LayoutObject.h"
#include "platform/geometry/FloatPoint.h"
#include "platform/geometry/FloatQuad.h"
#include "platform/geometry/IntSize.h"
#include "platform/geometry/LayoutSize.h"
#include "wtf/Allocator.h"
#include "wtf/OwnPtr.h"
namespace blink {
class PaintLayer;
class LayoutBoxModelObject;
class TransformationMatrix;
class TransformState;
// Can be used while walking the layout tree to cache data about offsets and transforms.
class CORE_EXPORT LayoutGeometryMap {
DISALLOW_NEW();
WTF_MAKE_NONCOPYABLE(LayoutGeometryMap);
public:
LayoutGeometryMap(MapCoordinatesFlags = UseTransforms);
~LayoutGeometryMap();
MapCoordinatesFlags getMapCoordinatesFlags() const { return m_mapCoordinatesFlags; }
FloatRect absoluteRect(const FloatRect& rect) const
{
return mapToAncestor(rect, 0).boundingBox();
}
// Map to an ancestor. Will assert that the ancestor has been pushed onto this map.
// A null ancestor maps through the LayoutView (including its scale transform, if any).
// If the ancestor is the LayoutView, the scroll offset is applied, but not the scale.
FloatQuad mapToAncestor(const FloatRect&, const LayoutBoxModelObject*) const;
// Called by code walking the layout or layer trees.
void pushMappingsToAncestor(const PaintLayer*, const PaintLayer* ancestorLayer);
void popMappingsToAncestor(const PaintLayer*);
void pushMappingsToAncestor(const LayoutObject*, const LayoutBoxModelObject* ancestorLayoutObject);
// The following methods should only be called by layoutObjects inside a call to pushMappingsToAncestor().
// Push geometry info between this layoutObject and some ancestor. The ancestor must be its container() or some
// stacking context between the layoutObject and its container.
void push(const LayoutObject*, const LayoutSize&, GeometryInfoFlags = 0, LayoutSize offsetForFixedPosition = LayoutSize());
void push(const LayoutObject*, const TransformationMatrix&, GeometryInfoFlags = 0, LayoutSize offsetForFixedPosition = LayoutSize());
private:
void popMappingsToAncestor(const LayoutBoxModelObject*);
void mapToAncestor(TransformState&, const LayoutBoxModelObject* ancestor = nullptr) const;
void stepInserted(const LayoutGeometryMapStep&);
void stepRemoved(const LayoutGeometryMapStep&);
bool hasNonUniformStep() const { return m_nonUniformStepsCount; }
bool hasTransformStep() const { return m_transformedStepsCount; }
bool hasFixedPositionStep() const { return m_fixedStepsCount; }
#ifndef NDEBUG
void dumpSteps() const;
#endif
#if ENABLE(ASSERT)
bool isTopmostLayoutView(const LayoutObject*) const;
#endif
typedef Vector<LayoutGeometryMapStep, 32> LayoutGeometryMapSteps;
size_t m_insertionPosition;
int m_nonUniformStepsCount;
int m_transformedStepsCount;
int m_fixedStepsCount;
LayoutGeometryMapSteps m_mapping;
LayoutSize m_accumulatedOffset;
MapCoordinatesFlags m_mapCoordinatesFlags;
};
} // namespace blink
#endif // LayoutGeometryMap_h
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