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26 #ifndef RenderGeometryMap_h
27 #define RenderGeometryMap_h
29 #include "FloatPoint.h"
30 #include "FloatQuad.h"
32 #include "RenderObject.h"
33 #include "TransformationMatrix.h"
34 #include <wtf/OwnPtr.h>
40 // Stores data about how to map from one renderer to its container.
41 struct RenderGeometryMapStep {
42 RenderGeometryMapStep(const RenderGeometryMapStep& o)
43 : m_renderer(o.m_renderer)
44 , m_offset(o.m_offset)
45 , m_accumulatingTransform(o.m_accumulatingTransform)
46 , m_isNonUniform(o.m_isNonUniform)
47 , m_isFixedPosition(o.m_isFixedPosition)
48 , m_hasTransform(o.m_hasTransform)
50 ASSERT(!o.m_transform);
52 RenderGeometryMapStep(const RenderObject* renderer, bool accumulatingTransform, bool isNonUniform, bool isFixedPosition, bool hasTransform)
53 : m_renderer(renderer)
54 , m_accumulatingTransform(accumulatingTransform)
55 , m_isNonUniform(isNonUniform)
56 , m_isFixedPosition(isFixedPosition)
57 , m_hasTransform(hasTransform)
60 const RenderObject* m_renderer;
62 OwnPtr<TransformationMatrix> m_transform; // Includes offset if non-null.
63 bool m_accumulatingTransform;
64 bool m_isNonUniform; // Mapping depends on the input point, e.g. because of CSS columns.
65 bool m_isFixedPosition;
69 // Can be used while walking the Renderer tree to cache data about offsets and transforms.
70 class RenderGeometryMap {
71 WTF_MAKE_NONCOPYABLE(RenderGeometryMap);
76 FloatPoint absolutePoint(const FloatPoint&) const;
77 FloatRect absoluteRect(const FloatRect&) const;
79 // Called by code walking the renderer or layer trees.
80 void pushMappingsToAncestor(const RenderLayer*, const RenderLayer* ancestorLayer);
81 void popMappingsToAncestor(const RenderLayer*);
82 void pushMappingsToAncestor(const RenderObject*, const RenderBoxModelObject* ancestorRenderer);
83 void popMappingsToAncestor(const RenderBoxModelObject*);
85 // The following methods should only be called by renderers inside a call to pushMappingsToAncestor().
87 // Push geometry info between this renderer and some ancestor. The ancestor must be its container() or some
88 // stacking context between the renderer and its container.
89 void push(const RenderObject*, const LayoutSize&, bool accumulatingTransform = false, bool isNonUniform = false, bool isFixedPosition = false, bool hasTransform = false);
90 void push(const RenderObject*, const TransformationMatrix&, bool accumulatingTransform = false, bool isNonUniform = false, bool isFixedPosition = false, bool hasTransform = false);
92 // RenderView gets special treatment, because it applies the scroll offset only for elements inside in fixed position.
93 void pushView(const RenderView*, const LayoutSize& scrollOffset, const TransformationMatrix* = 0);
96 void mapToAbsolute(TransformState&) const;
98 void stepInserted(const RenderGeometryMapStep&);
99 void stepRemoved(const RenderGeometryMapStep&);
101 bool hasNonUniformStep() const { return m_nonUniformStepsCount; }
102 bool hasTransformStep() const { return m_transformedStepsCount; }
103 bool hasFixedPositionStep() const { return m_fixedStepsCount; }
105 typedef Vector<RenderGeometryMapStep, 32> RenderGeometryMapSteps;
107 size_t m_insertionPosition;
108 int m_nonUniformStepsCount;
109 int m_transformedStepsCount;
110 int m_fixedStepsCount;
111 RenderGeometryMapSteps m_mapping;
112 LayoutSize m_accumulatedOffset;
115 } // namespace WebCore
118 // This is required for a struct with OwnPtr. We know RenderGeometryMapStep is simple enough that
119 // initializing to 0 and moving with memcpy (and then not destructing the original) will work.
120 template<> struct VectorTraits<WebCore::RenderGeometryMapStep> : SimpleClassVectorTraits { };
123 #endif // RenderGeometryMap_h