third_party/WebKit/Source/platform/transforms/TranslateTransformOperation.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/TranslateTransformOperation.h"
  24
  25 namespace blink {
  26
  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
  43 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 PassRefPtr<TranslateTransformOperation> TranslateTransformOperation::zoomTranslate(double factor)
  53 {
  54     return create(m_x.zoom(factor), m_y.zoom(factor), m_z * factor, m_type);
  55 }
  56
  57 } // namespace blink