third_party/WebKit/Source/platform/transforms/MatrixTransformOperation.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/MatrixTransformOperation.h"
  24
  25 #include <algorithm>
  26
  27 namespace blink {
  28
  29 PassRefPtr<TransformOperation> MatrixTransformOperation::blend(const TransformOperation* from, double progress, bool blendToIdentity)
  30 {
  31     if (from && !from->isSameType(*this))
  32         return this;
  33
  34     // convert the TransformOperations into matrices
  35     FloatSize size;
  36     TransformationMatrix fromT;
  37     TransformationMatrix toT(m_a, m_b, m_c, m_d, m_e, m_f);
  38     if (from) {
  39         const MatrixTransformOperation* m = static_cast<const MatrixTransformOperation*>(from);
  40         fromT.setMatrix(m->m_a, m->m_b, m->m_c, m->m_d, m->m_e, m->m_f);
  41     }
  42
  43     if (blendToIdentity)
  44         std::swap(fromT, toT);
  45
  46     toT.blend(fromT, progress);
  47     return MatrixTransformOperation::create(toT.a(), toT.b(), toT.c(), toT.d(), toT.e(), toT.f());
  48 }
  49
  50 PassRefPtr<TransformOperation> MatrixTransformOperation::zoom(double factor)
  51 {
  52     return create(m_a, m_b, m_c, m_d, m_e * factor, m_f * factor);
  53 }
  54
  55 } // namespace blink