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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/ScaleTransformOperation.h"
24 
25 #include "platform/animation/AnimationUtilities.h"
26 
27 namespace blink {
28 
blend(const TransformOperation * from,double progress,bool blendToIdentity)29 PassRefPtr<TransformOperation> ScaleTransformOperation::blend(const TransformOperation* from, double progress, bool blendToIdentity)
30 {
31     if (from && !from->canBlendWith(*this))
32         return this;
33 
34     if (blendToIdentity)
35         return ScaleTransformOperation::create(blink::blend(m_x, 1.0, progress),
36                                                blink::blend(m_y, 1.0, progress),
37                                                blink::blend(m_z, 1.0, progress), m_type);
38 
39     const ScaleTransformOperation* fromOp = static_cast<const ScaleTransformOperation*>(from);
40     double fromX = fromOp ? fromOp->m_x : 1.0;
41     double fromY = fromOp ? fromOp->m_y : 1.0;
42     double fromZ = fromOp ? fromOp->m_z : 1.0;
43     return ScaleTransformOperation::create(blink::blend(fromX, m_x, progress),
44                                            blink::blend(fromY, m_y, progress),
45                                            blink::blend(fromZ, m_z, progress), m_type);
46 }
47 
48 
canBlendWith(const TransformOperation & other) const49 bool ScaleTransformOperation::canBlendWith(const TransformOperation& other) const
50 {
51     return other.type() == ScaleX
52         || other.type() == ScaleY
53         || other.type() == ScaleZ
54         || other.type() == Scale3D
55         || other.type() == Scale;
56 }
57 
58 } // namespace blink
59