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/Noncopyable.h> 35 #include <wtf/PassRefPtr.h> 36 #include <wtf/OwnPtr.h> 37 #include <wtf/RefCounted.h> 38 39 namespace WebCore { 40 41 class TransformState : public Noncopyable { 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) m_lastPlanarPoint(p)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 lastPlanarPoint()68 FloatPoint lastPlanarPoint() const { return m_lastPlanarPoint; } lastPlanarQuad()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: create(const FloatPoint & p,const FloatQuad & quad)90 static PassRefPtr<HitTestingTransformState> create(const FloatPoint& p, const FloatQuad& quad) 91 { 92 return adoptRef(new HitTestingTransformState(p, quad)); 93 } 94 create(const HitTestingTransformState & other)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: HitTestingTransformState(const FloatPoint & p,const FloatQuad & quad)114 HitTestingTransformState(const FloatPoint& p, const FloatQuad& quad) 115 : m_lastPlanarPoint(p) 116 , m_lastPlanarQuad(quad) 117 , m_accumulatingTransform(false) 118 { 119 } 120 HitTestingTransformState(const HitTestingTransformState & other)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