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 "platform/transforms/SkewTransformOperation.h"
24
25#include "platform/animation/AnimationUtilities.h"
26
27namespace blink {
28
29PassRefPtr<TransformOperation> SkewTransformOperation::blend(const TransformOperation* from, double progress, bool blendToIdentity)
30{
31    if (from && !from->canBlendWith(*this))
32        return this;
33
34    if (blendToIdentity)
35        return SkewTransformOperation::create(blink::blend(m_angleX, 0.0, progress), blink::blend(m_angleY, 0.0, progress), m_type);
36
37    const SkewTransformOperation* fromOp = static_cast<const SkewTransformOperation*>(from);
38    double fromAngleX = fromOp ? fromOp->m_angleX : 0;
39    double fromAngleY = fromOp ? fromOp->m_angleY : 0;
40    return SkewTransformOperation::create(blink::blend(fromAngleX, m_angleX, progress), blink::blend(fromAngleY, m_angleY, progress), m_type);
41}
42
43bool SkewTransformOperation::canBlendWith(const TransformOperation& other) const
44{
45    return other.type() == Skew
46        || other.type() == SkewX
47        || other.type() == SkewY;
48}
49
50} // namespace blink
51