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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/TranslateTransformOperation.h"
24 
25 namespace blink {
26 
blend(const TransformOperation * from,double progress,bool blendToIdentity)27 PassRefPtr<TransformOperation> TranslateTransformOperation::blend(const TransformOperation* from, double progress, bool blendToIdentity)
28 {
29     if (from && !from->canBlendWith(*this))
30         return this;
31 
32     const Length zeroLength(0, Fixed);
33     if (blendToIdentity)
34         return TranslateTransformOperation::create(zeroLength.blend(m_x, progress, ValueRangeAll), zeroLength.blend(m_y, progress, ValueRangeAll), blink::blend(0., m_z, progress), m_type);
35 
36     const TranslateTransformOperation* fromOp = static_cast<const TranslateTransformOperation*>(from);
37     Length fromX = fromOp ? fromOp->m_x : zeroLength;
38     Length fromY = fromOp ? fromOp->m_y : zeroLength;
39     double fromZ = fromOp ? fromOp->m_z : 0;
40     return TranslateTransformOperation::create(m_x.blend(fromX, progress, ValueRangeAll), m_y.blend(fromY, progress, ValueRangeAll), blink::blend(fromZ, m_z, progress), m_type);
41 }
42 
canBlendWith(const TransformOperation & other) const43 bool TranslateTransformOperation::canBlendWith(const TransformOperation& other) const
44 {
45     return other.type() == Translate
46         || other.type() == TranslateX
47         || other.type() == TranslateY
48         || other.type() == TranslateZ
49         || other.type() == Translate3D;
50 }
51 
52 } // namespace blink
53