1 /* 2 * Copyright (C) 2013 Google 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 are 6 * met: 7 * 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above 11 * copyright notice, this list of conditions and the following disclaimer 12 * in the documentation and/or other materials provided with the 13 * distribution. 14 * * Neither the name of Google Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived from 16 * this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #ifndef AnimatableValue_h 32 #define AnimatableValue_h 33 34 #include "core/css/CSSValue.h" 35 #include "platform/heap/Handle.h" 36 #include "wtf/RefCounted.h" 37 38 namespace WebCore { 39 40 class AnimatableValue : public RefCountedWillBeGarbageCollectedFinalized<AnimatableValue> { 41 public: 42 virtual ~AnimatableValue() { } 43 44 static const AnimatableValue* neutralValue(); 45 46 static PassRefPtrWillBeRawPtr<AnimatableValue> interpolate(const AnimatableValue*, const AnimatableValue*, double fraction); 47 static double distance(const AnimatableValue* from, const AnimatableValue* to); 48 static bool usesDefaultInterpolation(const AnimatableValue* from, const AnimatableValue* to) 49 { 50 return !from->isSameType(to) || from->usesDefaultInterpolationWith(to); 51 } 52 53 bool equals(const AnimatableValue* value) const 54 { 55 return isSameType(value) && equalTo(value); 56 } 57 bool equals(const AnimatableValue& value) const 58 { 59 return equals(&value); 60 } 61 62 bool isClipPathOperation() const { return type() == TypeClipPathOperation; } 63 bool isColor() const { return type() == TypeColor; } 64 bool isDouble() const { return type() == TypeDouble; } 65 bool isFilterOperations() const { return type() == TypeFilterOperations; } 66 bool isImage() const { return type() == TypeImage; } 67 bool isLength() const { return type() == TypeLength; } 68 bool isLengthBox() const { return type() == TypeLengthBox; } 69 bool isLengthBoxAndBool() const { return type() == TypeLengthBoxAndBool; } 70 bool isLengthPoint() const { return type() == TypeLengthPoint; } 71 bool isLengthPoint3D() const { return type() == TypeLengthPoint3D; } 72 bool isLengthSize() const { return type() == TypeLengthSize; } 73 bool isNeutral() const { return type() == TypeNeutral; } 74 bool isRepeatable() const { return type() == TypeRepeatable; } 75 bool isSVGLength() const { return type() == TypeSVGLength; } 76 bool isSVGPaint() const { return type() == TypeSVGPaint; } 77 bool isShadow() const { return type() == TypeShadow; } 78 bool isShapeValue() const { return type() == TypeShapeValue; } 79 bool isStrokeDasharrayList() const { return type() == TypeStrokeDasharrayList; } 80 bool isTransform() const { return type() == TypeTransform; } 81 bool isUnknown() const { return type() == TypeUnknown; } 82 bool isVisibility() const { return type() == TypeVisibility; } 83 84 bool isSameType(const AnimatableValue* value) const 85 { 86 ASSERT(value); 87 return value->type() == type(); 88 } 89 90 virtual void trace(Visitor*) { } 91 92 protected: 93 enum AnimatableType { 94 TypeClipPathOperation, 95 TypeColor, 96 TypeDouble, 97 TypeFilterOperations, 98 TypeImage, 99 TypeLength, 100 TypeLengthBox, 101 TypeLengthBoxAndBool, 102 TypeLengthPoint, 103 TypeLengthPoint3D, 104 TypeLengthSize, 105 TypeNeutral, 106 TypeRepeatable, 107 TypeSVGLength, 108 TypeSVGPaint, 109 TypeShadow, 110 TypeShapeValue, 111 TypeStrokeDasharrayList, 112 TypeTransform, 113 TypeUnknown, 114 TypeVisibility, 115 }; 116 117 virtual bool usesDefaultInterpolationWith(const AnimatableValue* value) const { return false; } 118 virtual PassRefPtrWillBeRawPtr<AnimatableValue> interpolateTo(const AnimatableValue*, double fraction) const = 0; 119 static PassRefPtrWillBeRawPtr<AnimatableValue> defaultInterpolateTo(const AnimatableValue* left, const AnimatableValue* right, double fraction) { return takeConstRef((fraction < 0.5) ? left : right); } 120 121 template <class T> 122 static PassRefPtrWillBeRawPtr<T> takeConstRef(const T* value) { return PassRefPtrWillBeRawPtr<T>(const_cast<T*>(value)); } 123 124 private: 125 virtual AnimatableType type() const = 0; 126 // Implementations can assume that the object being compared has the same type as the object this is called on 127 virtual bool equalTo(const AnimatableValue*) const = 0; 128 129 virtual double distanceTo(const AnimatableValue*) const; 130 131 template <class Keyframe> friend class KeyframeEffectModel; 132 }; 133 134 #define DEFINE_ANIMATABLE_VALUE_TYPE_CASTS(thisType, predicate) \ 135 DEFINE_TYPE_CASTS(thisType, AnimatableValue, value, value->predicate, value.predicate) 136 137 } // namespace WebCore 138 139 #endif // AnimatableValue_h 140