libcore/Transform.h

   1 // Transform.h:  Transform information for rendering.
   2 //
   3 //   Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012
   4 //   Free Software Foundation, Inc
   5 //
   6 // This program is free software; you can redistribute it and/or modify
   7 // it under the terms of the GNU General Public License as published by
   8 // the Free Software Foundation; either version 3 of the License, or
   9 // (at your option) any later version.
  10 //
  11 // This program is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15 //
  16 // You should have received a copy of the GNU General Public License
  17 // along with this program; if not, write to the Free Software
  18 // Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  19
  20 #ifndef GNASH_TRANSFORM_H
  21 #define GNASH_TRANSFORM_H
  22
  23 #include "SWFMatrix.h"
  24 #include "SWFCxForm.h"
  25 #include <utility>
  26
  27 namespace gnash {
  28
  29 /// The Transform class expresses a stage in a cumulative transformation
  30 //
  31 /// All DisplayObjects have a color transform and a matrix, which is
  32 /// concatenated with its parent's transform to produce the actual transform.
  33 class Transform
  34 {
  35 public:
  36
  37     /// Construct a Transform
  38     //
  39     /// Any arguments not supplied are identity transformations.
  40     explicit Transform(SWFMatrix m = SWFMatrix(),
  41             SWFCxForm cx = SWFCxForm())
  42         :
  43         matrix(std::move(m)),
  44         colorTransform(std::move(cx))
  45     {}
  46
  47     Transform(const Transform& other)
  48         :
  49         matrix(other.matrix),
  50         colorTransform(other.colorTransform)
  51     {}
  52
  53     Transform& operator*=(const Transform& other) {
  54         matrix.concatenate(other.matrix);
  55         colorTransform.concatenate(other.colorTransform);
  56         return *this;
  57     }
  58
  59     SWFMatrix matrix;
  60     SWFCxForm colorTransform;
  61 };
  62
  63 /// Concatenate two transforms.
  64 inline Transform
  65 operator*(const Transform& a, const Transform& b)
  66 {
  67     Transform ret(a);
  68     ret *= b;
  69     return ret;
  70 }
  71
  72 } // namespace gnash
  73
  74 #endif