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 "SkewTransformOperation.h"
24
25 namespace WebCore {
26
blend(const TransformOperation * from,double progress,bool blendToIdentity)27 PassRefPtr<TransformOperation> SkewTransformOperation::blend(const TransformOperation* from, double progress, bool blendToIdentity)
28 {
29 if (from && !from->isSameType(*this))
30 return this;
31
32 if (blendToIdentity)
33 return SkewTransformOperation::create(m_angleX - m_angleX * progress, m_angleY - m_angleY * progress, m_type);
34
35 const SkewTransformOperation* fromOp = static_cast<const SkewTransformOperation*>(from);
36 double fromAngleX = fromOp ? fromOp->m_angleX : 0;
37 double fromAngleY = fromOp ? fromOp->m_angleY : 0;
38 return SkewTransformOperation::create(fromAngleX + (m_angleX - fromAngleX) * progress, fromAngleY + (m_angleY - fromAngleY) * progress, m_type);
39 }
40
41 } // namespace WebCore
42