145 lines
6.3 KiB
C++
145 lines
6.3 KiB
C++
/*
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* Copyright (C) 2012 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include "FloatPoint.h"
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#include "FloatQuad.h"
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#include "LayoutSize.h"
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#include "RenderObject.h"
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#include "TransformationMatrix.h"
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#include <memory>
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namespace WebCore {
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class RenderFragmentedFlow;
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class RenderLayer;
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class RenderLayerModelObject;
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class RenderView;
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class TransformState;
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// Stores data about how to map from one renderer to its container.
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struct RenderGeometryMapStep {
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RenderGeometryMapStep(const RenderGeometryMapStep& o)
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: m_renderer(o.m_renderer)
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, m_offset(o.m_offset)
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, m_accumulatingTransform(o.m_accumulatingTransform)
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, m_isNonUniform(o.m_isNonUniform)
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, m_isFixedPosition(o.m_isFixedPosition)
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, m_hasTransform(o.m_hasTransform)
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{
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ASSERT(!o.m_transform);
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}
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RenderGeometryMapStep(const RenderObject* renderer, bool accumulatingTransform, bool isNonUniform, bool isFixedPosition, bool hasTransform)
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: m_renderer(renderer)
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, m_accumulatingTransform(accumulatingTransform)
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, m_isNonUniform(isNonUniform)
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, m_isFixedPosition(isFixedPosition)
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, m_hasTransform(hasTransform)
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{
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}
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const RenderObject* m_renderer;
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LayoutSize m_offset;
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std::unique_ptr<TransformationMatrix> m_transform; // Includes offset if non-null.
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bool m_accumulatingTransform;
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bool m_isNonUniform; // Mapping depends on the input point, e.g. because of CSS columns.
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bool m_isFixedPosition;
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bool m_hasTransform;
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};
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// Can be used while walking the Renderer tree to cache data about offsets and transforms.
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class RenderGeometryMap {
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WTF_MAKE_NONCOPYABLE(RenderGeometryMap);
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public:
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explicit RenderGeometryMap(OptionSet<MapCoordinatesMode> = UseTransforms);
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~RenderGeometryMap();
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OptionSet<MapCoordinatesMode> mapCoordinatesFlags() const { return m_mapCoordinatesFlags; }
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FloatPoint absolutePoint(const FloatPoint& p) const
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{
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return mapToContainer(p, nullptr);
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}
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FloatRect absoluteRect(const FloatRect& rect) const
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{
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return mapToContainer(rect, nullptr).boundingBox();
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}
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// Map to a container. Will assert that the container has been pushed onto this map.
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// A null container maps through the RenderView (including its scale transform, if any).
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// If the container is the RenderView, the scroll offset is applied, but not the scale.
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FloatPoint mapToContainer(const FloatPoint&, const RenderLayerModelObject*) const;
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FloatQuad mapToContainer(const FloatRect&, const RenderLayerModelObject*) const;
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// Called by code walking the renderer or layer trees.
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void pushMappingsToAncestor(const RenderLayer*, const RenderLayer* ancestorLayer, bool respectTransforms = true);
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void popMappingsToAncestor(const RenderLayer*);
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void pushMappingsToAncestor(const RenderObject*, const RenderLayerModelObject* ancestorRenderer);
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void popMappingsToAncestor(const RenderLayerModelObject*);
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// The following methods should only be called by renderers inside a call to pushMappingsToAncestor().
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// Push geometry info between this renderer and some ancestor. The ancestor must be its container() or some
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// stacking context between the renderer and its container.
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void push(const RenderObject*, const LayoutSize&, bool accumulatingTransform = false, bool isNonUniform = false, bool isFixedPosition = false, bool hasTransform = false);
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void push(const RenderObject*, const TransformationMatrix&, bool accumulatingTransform = false, bool isNonUniform = false, bool isFixedPosition = false, bool hasTransform = false);
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// RenderView gets special treatment, because it applies the scroll offset only for elements inside in fixed position.
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void pushView(const RenderView*, const LayoutSize& scrollOffset, const TransformationMatrix* = nullptr);
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void pushRenderFragmentedFlow(const RenderFragmentedFlow*);
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private:
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void mapToContainer(TransformState&, const RenderLayerModelObject* container = nullptr) const;
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void stepInserted(const RenderGeometryMapStep&);
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void stepRemoved(const RenderGeometryMapStep&);
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bool hasNonUniformStep() const { return m_nonUniformStepsCount; }
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bool hasTransformStep() const { return m_transformedStepsCount; }
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bool hasFixedPositionStep() const { return m_fixedStepsCount; }
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typedef Vector<RenderGeometryMapStep, 32> RenderGeometryMapSteps;
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size_t m_insertionPosition { notFound };
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int m_nonUniformStepsCount { 0 };
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int m_transformedStepsCount { 0 };
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int m_fixedStepsCount { 0 };
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RenderGeometryMapSteps m_mapping;
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LayoutSize m_accumulatedOffset;
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OptionSet<MapCoordinatesMode> m_mapCoordinatesFlags;
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#if ASSERT_ENABLED
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bool m_accumulatedOffsetMightBeSaturated { false };
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#endif
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};
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} // namespace WebCore
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namespace WTF {
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// This is required for a struct with std::unique_ptr<>. We know RenderGeometryMapStep is simple enough that
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// initializing to 0 and moving with memcpy (and then not destructing the original) will work.
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template<> struct VectorTraits<WebCore::RenderGeometryMapStep> : SimpleClassVectorTraits { };
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}
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