LCOV - app.info - content/smil/nsSMILKeySpline.h

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_

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