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      1 /*
      2  * Copyright (C) 2011 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 HitTestingTransformState_h
     27 #define HitTestingTransformState_h
     28 
     29 #include "platform/geometry/FloatQuad.h"
     30 #include "platform/geometry/FloatPoint.h"
     31 #include "platform/geometry/IntSize.h"
     32 #include "platform/transforms/AffineTransform.h"
     33 #include "platform/transforms/TransformationMatrix.h"
     34 #include "wtf/PassRefPtr.h"
     35 #include "wtf/RefCounted.h"
     36 
     37 namespace WebCore {
     38 
     39 // FIXME: Now that TransformState lazily creates its TransformationMatrix it takes up less space.
     40 // So there's really no need for a ref counted version. So This class should be removed and replaced
     41 // with TransformState. There are some minor differences (like the way translate() works slightly
     42 // differently than move()) so care has to be taken when this is done.
     43 class HitTestingTransformState : public RefCounted<HitTestingTransformState> {
     44 public:
     45     static PassRefPtr<HitTestingTransformState> create(const FloatPoint& p, const FloatQuad& quad, const FloatQuad& area)
     46     {
     47         return adoptRef(new HitTestingTransformState(p, quad, area));
     48     }
     49 
     50     static PassRefPtr<HitTestingTransformState> create(const HitTestingTransformState& other)
     51     {
     52         return adoptRef(new HitTestingTransformState(other));
     53     }
     54 
     55     enum TransformAccumulation { FlattenTransform, AccumulateTransform };
     56     void translate(int x, int y, TransformAccumulation);
     57     void applyTransform(const TransformationMatrix& transformFromContainer, TransformAccumulation);
     58 
     59     FloatPoint mappedPoint() const;
     60     FloatQuad mappedQuad() const;
     61     FloatQuad mappedArea() const;
     62     LayoutRect boundsOfMappedArea() const;
     63     void flatten();
     64 
     65     FloatPoint m_lastPlanarPoint;
     66     FloatQuad m_lastPlanarQuad;
     67     FloatQuad m_lastPlanarArea;
     68     TransformationMatrix m_accumulatedTransform;
     69     bool m_accumulatingTransform;
     70 
     71 private:
     72     HitTestingTransformState(const FloatPoint& p, const FloatQuad& quad, const FloatQuad& area)
     73         : m_lastPlanarPoint(p)
     74         , m_lastPlanarQuad(quad)
     75         , m_lastPlanarArea(area)
     76         , m_accumulatingTransform(false)
     77     {
     78     }
     79 
     80     HitTestingTransformState(const HitTestingTransformState& other)
     81         : RefCounted<HitTestingTransformState>()
     82         , m_lastPlanarPoint(other.m_lastPlanarPoint)
     83         , m_lastPlanarQuad(other.m_lastPlanarQuad)
     84         , m_lastPlanarArea(other.m_lastPlanarArea)
     85         , m_accumulatedTransform(other.m_accumulatedTransform)
     86         , m_accumulatingTransform(other.m_accumulatingTransform)
     87     {
     88     }
     89 
     90     void flattenWithTransform(const TransformationMatrix&);
     91 };
     92 
     93 } // namespace WebCore
     94 
     95 #endif // HitTestingTransformState_h
     96