1/* 2 * Copyright (C) 1999 Antti Koivisto (koivisto@kde.org) 3 * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved. 4 * 5 * This library is free software; you can redistribute it and/or 6 * modify it under the terms of the GNU Library General Public 7 * License as published by the Free Software Foundation; either 8 * version 2 of the License, or (at your option) any later version. 9 * 10 * This library is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 * Library General Public License for more details. 14 * 15 * You should have received a copy of the GNU Library General Public License 16 * along with this library; see the file COPYING.LIB. If not, write to 17 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 18 * Boston, MA 02110-1301, USA. 19 * 20 */ 21 22#include "config.h" 23#include "TransformOperations.h" 24 25#include "IdentityTransformOperation.h" 26#include "Matrix3DTransformOperation.h" 27#include <algorithm> 28 29namespace WebCore { 30 31TransformOperations::TransformOperations(bool makeIdentity) 32{ 33 if (makeIdentity) 34 m_operations.append(IdentityTransformOperation::create()); 35} 36 37bool TransformOperations::operator==(const TransformOperations& o) const 38{ 39 if (m_operations.size() != o.m_operations.size()) 40 return false; 41 42 unsigned s = m_operations.size(); 43 for (unsigned i = 0; i < s; i++) { 44 if (*m_operations[i] != *o.m_operations[i]) 45 return false; 46 } 47 48 return true; 49} 50 51bool TransformOperations::operationsMatch(const TransformOperations& other) const 52{ 53 size_t numOperations = operations().size(); 54 // If the sizes of the function lists don't match, the lists don't match 55 if (numOperations != other.operations().size()) 56 return false; 57 58 // If the types of each function are not the same, the lists don't match 59 for (size_t i = 0; i < numOperations; ++i) { 60 if (!operations()[i]->isSameType(*other.operations()[i])) 61 return false; 62 } 63 return true; 64} 65 66TransformOperations TransformOperations::blendByMatchingOperations(const TransformOperations& from, const double& progress) const 67{ 68 TransformOperations result; 69 70 unsigned fromSize = from.operations().size(); 71 unsigned toSize = operations().size(); 72 unsigned size = std::max(fromSize, toSize); 73 for (unsigned i = 0; i < size; i++) { 74 RefPtr<TransformOperation> fromOperation = (i < fromSize) ? from.operations()[i].get() : 0; 75 RefPtr<TransformOperation> toOperation = (i < toSize) ? operations()[i].get() : 0; 76 RefPtr<TransformOperation> blendedOperation = toOperation ? toOperation->blend(fromOperation.get(), progress) : (fromOperation ? fromOperation->blend(0, progress, true) : 0); 77 if (blendedOperation) 78 result.operations().append(blendedOperation); 79 else { 80 RefPtr<TransformOperation> identityOperation = IdentityTransformOperation::create(); 81 if (progress > 0.5) 82 result.operations().append(toOperation ? toOperation : identityOperation); 83 else 84 result.operations().append(fromOperation ? fromOperation : identityOperation); 85 } 86 } 87 88 return result; 89} 90 91TransformOperations TransformOperations::blendByUsingMatrixInterpolation(const TransformOperations& from, double progress, const LayoutSize& size) const 92{ 93 TransformOperations result; 94 95 // Convert the TransformOperations into matrices 96 TransformationMatrix fromTransform; 97 TransformationMatrix toTransform; 98 from.apply(size, fromTransform); 99 apply(size, toTransform); 100 101 toTransform.blend(fromTransform, progress); 102 103 // Append the result 104 result.operations().append(Matrix3DTransformOperation::create(toTransform)); 105 106 return result; 107} 108 109TransformOperations TransformOperations::blend(const TransformOperations& from, double progress, const LayoutSize& size) const 110{ 111 if (from == *this) 112 return *this; 113 114 if (from.size() && from.operationsMatch(*this)) 115 return blendByMatchingOperations(from, progress); 116 117 return blendByUsingMatrixInterpolation(from, progress, size); 118} 119 120} // namespace WebCore 121