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