third_party/WebKit/Source/platform/transforms/SkewTransformOperation.cpp

   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
  27 namespace blink {
  28
  29 PassRefPtr<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
  43 bool 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