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      1 /*
      2  * Copyright (C) 2009 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 TransformState_h
     27 #define TransformState_h
     28 
     29 #include "AffineTransform.h"
     30 #include "FloatPoint.h"
     31 #include "FloatQuad.h"
     32 #include "IntSize.h"
     33 #include "TransformationMatrix.h"
     34 #include <wtf/PassRefPtr.h>
     35 #include <wtf/OwnPtr.h>
     36 #include <wtf/RefCounted.h>
     37 
     38 namespace WebCore {
     39 
     40 class TransformState {
     41     WTF_MAKE_NONCOPYABLE(TransformState);
     42 public:
     43     enum TransformDirection { ApplyTransformDirection, UnapplyInverseTransformDirection };
     44     enum TransformAccumulation { FlattenTransform, AccumulateTransform };
     45 
     46     // If quad is non-null, it will be mapped
     47     TransformState(TransformDirection mappingDirection, const FloatPoint& p, const FloatQuad* quad = 0)
     48         : m_lastPlanarPoint(p)
     49         , m_accumulatingTransform(false)
     50         , m_mapQuad(quad != 0)
     51         , m_direction(mappingDirection)
     52     {
     53         if (quad)
     54             m_lastPlanarQuad = *quad;
     55     }
     56 
     57     void move(const IntSize& s, TransformAccumulation accumulate = FlattenTransform)
     58     {
     59         move(s.width(), s.height(), accumulate);
     60     }
     61 
     62     void move(int x, int y, TransformAccumulation = FlattenTransform);
     63     void applyTransform(const AffineTransform& transformFromContainer, TransformAccumulation = FlattenTransform);
     64     void applyTransform(const TransformationMatrix& transformFromContainer, TransformAccumulation = FlattenTransform);
     65     void flatten();
     66 
     67     // Return the coords of the point or quad in the last flattened layer
     68     FloatPoint lastPlanarPoint() const { return m_lastPlanarPoint; }
     69     FloatQuad lastPlanarQuad() const { return m_lastPlanarQuad; }
     70 
     71     // Return the point or quad mapped through the current transform
     72     FloatPoint mappedPoint() const;
     73     FloatQuad mappedQuad() const;
     74 
     75 private:
     76     void flattenWithTransform(const TransformationMatrix&);
     77 
     78     FloatPoint m_lastPlanarPoint;
     79     FloatQuad m_lastPlanarQuad;
     80 
     81     // We only allocate the transform if we need to
     82     OwnPtr<TransformationMatrix> m_accumulatedTransform;
     83     bool m_accumulatingTransform;
     84     bool m_mapQuad;
     85     TransformDirection m_direction;
     86 };
     87 
     88 class HitTestingTransformState : public RefCounted<HitTestingTransformState> {
     89 public:
     90     static PassRefPtr<HitTestingTransformState> create(const FloatPoint& p, const FloatQuad& quad)
     91     {
     92         return adoptRef(new HitTestingTransformState(p, quad));
     93     }
     94 
     95     static PassRefPtr<HitTestingTransformState> create(const HitTestingTransformState& other)
     96     {
     97         return adoptRef(new HitTestingTransformState(other));
     98     }
     99 
    100     enum TransformAccumulation { FlattenTransform, AccumulateTransform };
    101     void translate(int x, int y, TransformAccumulation);
    102     void applyTransform(const TransformationMatrix& transformFromContainer, TransformAccumulation);
    103 
    104     FloatPoint mappedPoint() const;
    105     FloatQuad mappedQuad() const;
    106     void flatten();
    107 
    108     FloatPoint m_lastPlanarPoint;
    109     FloatQuad m_lastPlanarQuad;
    110     TransformationMatrix m_accumulatedTransform;
    111     bool m_accumulatingTransform;
    112 
    113 private:
    114     HitTestingTransformState(const FloatPoint& p, const FloatQuad& quad)
    115         : m_lastPlanarPoint(p)
    116         , m_lastPlanarQuad(quad)
    117         , m_accumulatingTransform(false)
    118     {
    119     }
    120 
    121     HitTestingTransformState(const HitTestingTransformState& other)
    122         : RefCounted<HitTestingTransformState>()
    123         , m_lastPlanarPoint(other.m_lastPlanarPoint)
    124         , m_lastPlanarQuad(other.m_lastPlanarQuad)
    125         , m_accumulatedTransform(other.m_accumulatedTransform)
    126         , m_accumulatingTransform(other.m_accumulatingTransform)
    127     {
    128     }
    129 
    130     void flattenWithTransform(const TransformationMatrix&);
    131 };
    132 
    133 } // namespace WebCore
    134 
    135 #endif // TransformState_h
    136