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 "MatrixTransformOperation.h"
24
25 #include <algorithm>
26
27 using namespace std;
28
29 namespace WebCore {
30
blend(const TransformOperation * from,double progress,bool blendToIdentity)31 PassRefPtr<TransformOperation> MatrixTransformOperation::blend(const TransformOperation* from, double progress, bool blendToIdentity)
32 {
33 if (from && !from->isSameType(*this))
34 return this;
35
36 // convert the TransformOperations into matrices
37 IntSize size;
38 TransformationMatrix fromT;
39 TransformationMatrix toT(m_a, m_b, m_c, m_d, m_e, m_f);
40 if (from) {
41 const MatrixTransformOperation* m = static_cast<const MatrixTransformOperation*>(from);
42 fromT.setMatrix(m->m_a, m->m_b, m->m_c, m->m_d, m->m_e, m->m_f);
43 }
44
45 if (blendToIdentity)
46 std::swap(fromT, toT);
47
48 toT.blend(fromT, progress);
49 return MatrixTransformOperation::create(toT.a(), toT.b(), toT.c(), toT.d(), toT.e(), toT.f());
50 }
51
52 } // namespace WebCore
53