libcore/Transform.h

   1 // Transform.h:  Transform information for rendering.
   2 //
   3 //   Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010 Free Software
   4 //   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
  26 namespace gnash {
  27
  28 /// The Transform class expresses a stage in a cumulative transformation
  29 //
  30 /// All DisplayObjects have a color transform and a matrix, which is
  31 /// concatenated with its parent's transform to produce the actual transform.
  32 class Transform
  33 {
  34 public:
  35
  36     /// Construct a Transform
  37     //
  38     /// Any arguments not supplied are identity transformations.
  39     explicit Transform(const SWFMatrix& m = SWFMatrix(),
  40             const SWFCxForm& cx = SWFCxForm())
  41         :
  42         matrix(m),
  43         colorTransform(cx)
  44     {}
  45
  46     Transform(const Transform& other)
  47         :
  48         matrix(other.matrix),
  49         colorTransform(other.colorTransform)
  50     {}
  51
  52     Transform& operator*=(const Transform& other) {
  53         matrix.concatenate(other.matrix);
  54         colorTransform.concatenate(other.colorTransform);
  55         return *this;
  56     }
  57
  58     SWFMatrix matrix;
  59     SWFCxForm colorTransform;
  60 };
  61
  62 /// Concatenate two transforms.
  63 inline Transform
  64 operator*(const Transform& a, const Transform& b)
  65 {
  66     Transform ret(a);
  67     ret *= b;
  68     return ret;
  69 }
  70
  71 } // namespace gnash
  72
  73 #endif