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      1 /*
      2  * Copyright (C) 2012 Apple Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
     17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #ifndef RenderGeometryMap_h
     27 #define RenderGeometryMap_h
     28 
     29 #include "core/rendering/RenderGeometryMapStep.h"
     30 #include "core/rendering/RenderObject.h"
     31 #include "platform/geometry/FloatPoint.h"
     32 #include "platform/geometry/FloatQuad.h"
     33 #include "platform/geometry/IntSize.h"
     34 #include "platform/geometry/LayoutSize.h"
     35 #include "wtf/OwnPtr.h"
     36 
     37 namespace blink {
     38 
     39 class RenderLayer;
     40 class RenderLayerModelObject;
     41 class TransformationMatrix;
     42 class TransformState;
     43 
     44 // Can be used while walking the Renderer tree to cache data about offsets and transforms.
     45 class RenderGeometryMap {
     46     WTF_MAKE_NONCOPYABLE(RenderGeometryMap);
     47 public:
     48     RenderGeometryMap(MapCoordinatesFlags = UseTransforms);
     49     ~RenderGeometryMap();
     50 
     51     MapCoordinatesFlags mapCoordinatesFlags() const { return m_mapCoordinatesFlags; }
     52 
     53     FloatRect absoluteRect(const FloatRect& rect) const
     54     {
     55         return mapToContainer(rect, 0).boundingBox();
     56     }
     57 
     58     // Map to a container. Will assert that the container has been pushed onto this map.
     59     // A null container maps through the RenderView (including its scale transform, if any).
     60     // If the container is the RenderView, the scroll offset is applied, but not the scale.
     61     FloatPoint mapToContainer(const FloatPoint&, const RenderLayerModelObject*) const;
     62     FloatQuad mapToContainer(const FloatRect&, const RenderLayerModelObject*) const;
     63 
     64     // Called by code walking the renderer or layer trees.
     65     void pushMappingsToAncestor(const RenderLayer*, const RenderLayer* ancestorLayer);
     66     void popMappingsToAncestor(const RenderLayer*);
     67     void pushMappingsToAncestor(const RenderObject*, const RenderLayerModelObject* ancestorRenderer);
     68     void popMappingsToAncestor(const RenderLayerModelObject*);
     69 
     70     // The following methods should only be called by renderers inside a call to pushMappingsToAncestor().
     71 
     72     // Push geometry info between this renderer and some ancestor. The ancestor must be its container() or some
     73     // stacking context between the renderer and its container.
     74     void push(const RenderObject*, const LayoutSize&, bool accumulatingTransform = false, bool isNonUniform = false, bool isFixedPosition = false, bool hasTransform = false, LayoutSize offsetForFixedPosition = LayoutSize());
     75     void push(const RenderObject*, const TransformationMatrix&, bool accumulatingTransform = false, bool isNonUniform = false, bool isFixedPosition = false, bool hasTransform = false, LayoutSize offsetForFixedPosition = LayoutSize());
     76 
     77 private:
     78     void mapToContainer(TransformState&, const RenderLayerModelObject* container = 0) const;
     79 
     80     void stepInserted(const RenderGeometryMapStep&);
     81     void stepRemoved(const RenderGeometryMapStep&);
     82 
     83     bool hasNonUniformStep() const { return m_nonUniformStepsCount; }
     84     bool hasTransformStep() const { return m_transformedStepsCount; }
     85     bool hasFixedPositionStep() const { return m_fixedStepsCount; }
     86 
     87 #ifndef NDEBUG
     88     void dumpSteps() const;
     89 #endif
     90 
     91 #if ENABLE(ASSERT)
     92     bool isTopmostRenderView(const RenderObject* renderer) const;
     93 #endif
     94 
     95     typedef Vector<RenderGeometryMapStep, 32> RenderGeometryMapSteps;
     96 
     97     size_t m_insertionPosition;
     98     int m_nonUniformStepsCount;
     99     int m_transformedStepsCount;
    100     int m_fixedStepsCount;
    101     RenderGeometryMapSteps m_mapping;
    102     LayoutSize m_accumulatedOffset;
    103     MapCoordinatesFlags m_mapCoordinatesFlags;
    104 };
    105 
    106 } // namespace blink
    107 
    108 #endif // RenderGeometryMap_h
    109