LCOV - code coverage report
Current view: directory - content/smil - nsSMILKeySpline.h (source / functions) Found Hit Coverage
Test: app.info Lines: 10 0 0.0 %
Date: 2012-06-02 Functions: 5 0 0.0 %

       1                 : /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
       2                 : /* ***** BEGIN LICENSE BLOCK *****
       3                 :  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
       4                 :  *
       5                 :  * The contents of this file are subject to the Mozilla Public License Version
       6                 :  * 1.1 (the "License"); you may not use this file except in compliance with
       7                 :  * the License. You may obtain a copy of the License at
       8                 :  * http://www.mozilla.org/MPL/
       9                 :  *
      10                 :  * Software distributed under the License is distributed on an "AS IS" basis,
      11                 :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
      12                 :  * for the specific language governing rights and limitations under the
      13                 :  * License.
      14                 :  *
      15                 :  * The Original Code is the Mozilla SMIL module.
      16                 :  *
      17                 :  * The Initial Developer of the Original Code is Brian Birtles.
      18                 :  * Portions created by the Initial Developer are Copyright (C) 2005
      19                 :  * the Initial Developer. All Rights Reserved.
      20                 :  *
      21                 :  * Contributor(s):
      22                 :  *   Brian Birtles <birtles@gmail.com>
      23                 :  *
      24                 :  * Alternatively, the contents of this file may be used under the terms of
      25                 :  * either of the GNU General Public License Version 2 or later (the "GPL"),
      26                 :  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
      27                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
      28                 :  * of those above. If you wish to allow use of your version of this file only
      29                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
      30                 :  * use your version of this file under the terms of the MPL, indicate your
      31                 :  * decision by deleting the provisions above and replace them with the notice
      32                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
      33                 :  * the provisions above, a recipient may use your version of this file under
      34                 :  * the terms of any one of the MPL, the GPL or the LGPL.
      35                 :  *
      36                 :  * ***** END LICENSE BLOCK ***** */
      37                 : 
      38                 : #ifndef NS_SMILKEYSPLINE_H_
      39                 : #define NS_SMILKEYSPLINE_H_
      40                 : 
      41                 : /**
      42                 :  * Utility class to provide scaling defined in a keySplines element.
      43                 :  */
      44                 : class nsSMILKeySpline
      45               0 : {
      46                 : public:
      47                 :   nsSMILKeySpline() { /* caller must call Init later */ }
      48                 : 
      49                 :   /**
      50                 :    * Creates a new key spline control point description.
      51                 :    *
      52                 :    * aX1, etc. are the x1, y1, x2, y2 cubic Bezier control points as defined by
      53                 :    * SMILANIM 3.2.3. They must each be in the range 0.0 <= x <= 1.0
      54                 :    */
      55               0 :   nsSMILKeySpline(double aX1, double aY1,
      56                 :                   double aX2, double aY2)
      57                 :   {
      58               0 :     Init(aX1, aY1, aX2, aY2);
      59               0 :   }
      60                 : 
      61                 :   void Init(double aX1, double aY1,
      62                 :             double aX2, double aY2);
      63                 : 
      64                 :   /**
      65                 :    * Gets the output (y) value for an input (x).
      66                 :    *
      67                 :    * @param aX  The input x value. A floating-point number between 0 and
      68                 :    *            1 (inclusive).
      69                 :    */
      70                 :   double GetSplineValue(double aX) const;
      71                 : 
      72                 :   void GetSplineDerivativeValues(double aX, double& aDX, double& aDY) const;
      73                 : 
      74                 : private:
      75                 :   void
      76                 :   CalcSampleValues();
      77                 : 
      78                 :   /**
      79                 :    * Returns x(t) given t, x1, and x2, or y(t) given t, y1, and y2.
      80                 :    */
      81                 :   static double
      82                 :   CalcBezier(double aT, double aA1, double aA2);
      83                 : 
      84                 :   /**
      85                 :    * Returns dx/dt given t, x1, and x2, or dy/dt given t, y1, and y2.
      86                 :    */
      87                 :   static double
      88                 :   GetSlope(double aT, double aA1, double aA2);
      89                 : 
      90                 :   double
      91                 :   GetTForX(double aX) const;
      92                 : 
      93                 :   double
      94                 :   NewtonRaphsonIterate(double aX, double aGuessT) const;
      95                 : 
      96                 :   double
      97                 :   BinarySubdivide(double aX, double aA, double aB) const;
      98                 : 
      99                 :   static double
     100               0 :   A(double aA1, double aA2)
     101                 :   {
     102               0 :     return 1.0 - 3.0 * aA2 + 3.0 * aA1;
     103                 :   }
     104                 : 
     105                 :   static double
     106               0 :   B(double aA1, double aA2)
     107                 :   {
     108               0 :     return 3.0 * aA2 - 6.0 * aA1;
     109                 :   }
     110                 : 
     111                 :   static double
     112               0 :   C(double aA1)
     113                 :   {
     114               0 :     return 3.0 * aA1;
     115                 :   }
     116                 : 
     117                 :   double               mX1;
     118                 :   double               mY1;
     119                 :   double               mX2;
     120                 :   double               mY2;
     121                 : 
     122                 :   enum { kSplineTableSize = 11 };
     123                 :   double               mSampleValues[kSplineTableSize];
     124                 : 
     125                 :   static const double  kSampleStepSize;
     126                 : };
     127                 : 
     128                 : #endif // NS_SMILKEYSPLINE_H_

Generated by: LCOV version 1.7