third_party/WebKit/Source/core/layout/HitTestingTransformState.h

   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/FloatPoint.h"
  30 #include "platform/geometry/FloatQuad.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 blink {
  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 blink
  94
  95 #endif // HitTestingTransformState_h