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 TransformState_h 27 #define TransformState_h 28 29 #include "platform/geometry/FloatPoint.h" 30 #include "platform/geometry/FloatQuad.h" 31 #include "platform/geometry/IntSize.h" 32 #include "platform/geometry/LayoutSize.h" 33 #include "platform/transforms/AffineTransform.h" 34 #include "platform/transforms/TransformationMatrix.h" 35 #include "wtf/OwnPtr.h" 36 37 namespace blink { 38 39 class PLATFORM_EXPORT TransformState { 40 public: 41 enum TransformDirection { ApplyTransformDirection, UnapplyInverseTransformDirection }; 42 enum TransformAccumulation { FlattenTransform, AccumulateTransform }; 43 TransformState(TransformDirection mappingDirection,const FloatPoint & p,const FloatQuad & quad)44 TransformState(TransformDirection mappingDirection, const FloatPoint& p, const FloatQuad& quad) 45 : m_lastPlanarPoint(p) 46 , m_lastPlanarQuad(quad) 47 , m_accumulatingTransform(false) 48 , m_mapPoint(true) 49 , m_mapQuad(true) 50 , m_direction(mappingDirection) 51 { 52 } 53 TransformState(TransformDirection mappingDirection,const FloatPoint & p)54 TransformState(TransformDirection mappingDirection, const FloatPoint& p) 55 : m_lastPlanarPoint(p) 56 , m_accumulatingTransform(false) 57 , m_mapPoint(true) 58 , m_mapQuad(false) 59 , m_direction(mappingDirection) 60 { 61 } 62 TransformState(TransformDirection mappingDirection,const FloatQuad & quad)63 TransformState(TransformDirection mappingDirection, const FloatQuad& quad) 64 : m_lastPlanarQuad(quad) 65 , m_accumulatingTransform(false) 66 , m_mapPoint(false) 67 , m_mapQuad(true) 68 , m_direction(mappingDirection) 69 { 70 } 71 TransformState(const TransformState & other)72 TransformState(const TransformState& other) { *this = other; } 73 74 TransformState& operator=(const TransformState&); 75 setQuad(const FloatQuad & quad)76 void setQuad(const FloatQuad& quad) 77 { 78 // FIXME: this assumes that the quad being added is in the coordinate system of the current state. 79 // This breaks if we're simultaneously mapping a point. https://bugs.webkit.org/show_bug.cgi?id=106680 80 ASSERT(!m_mapPoint); 81 m_accumulatedOffset = LayoutSize(); 82 m_lastPlanarQuad = quad; 83 } 84 85 void move(LayoutUnit x, LayoutUnit y, TransformAccumulation accumulate = FlattenTransform) 86 { 87 move(LayoutSize(x, y), accumulate); 88 } 89 90 void move(const LayoutSize&, TransformAccumulation = FlattenTransform); 91 void applyTransform(const AffineTransform& transformFromContainer, TransformAccumulation = FlattenTransform, bool* wasClamped = 0); 92 void applyTransform(const TransformationMatrix& transformFromContainer, TransformAccumulation = FlattenTransform, bool* wasClamped = 0); 93 void flatten(bool* wasClamped = 0); 94 95 // Return the coords of the point or quad in the last flattened layer lastPlanarPoint()96 FloatPoint lastPlanarPoint() const { return m_lastPlanarPoint; } lastPlanarQuad()97 FloatQuad lastPlanarQuad() const { return m_lastPlanarQuad; } 98 99 // Return the point or quad mapped through the current transform 100 FloatPoint mappedPoint(bool* wasClamped = 0) const; 101 FloatQuad mappedQuad(bool* wasClamped = 0) const; 102 103 private: 104 void translateTransform(const LayoutSize&); 105 void translateMappedCoordinates(const LayoutSize&); 106 void flattenWithTransform(const TransformationMatrix&, bool* wasClamped); 107 void applyAccumulatedOffset(); 108 109 FloatPoint m_lastPlanarPoint; 110 FloatQuad m_lastPlanarQuad; 111 112 // We only allocate the transform if we need to 113 OwnPtr<TransformationMatrix> m_accumulatedTransform; 114 LayoutSize m_accumulatedOffset; 115 bool m_accumulatingTransform; 116 bool m_mapPoint, m_mapQuad; 117 TransformDirection m_direction; 118 }; 119 120 } // namespace blink 121 122 #endif // TransformState_h 123