LCOV - app.info - objdir/dist/include/mozilla/gfx/PathHelpers.h

LCOV - code coverage report
| Current view: | directory - objdir/dist/include/mozilla/gfx - PathHelpers.h (source / functions) |  | Found | Hit | Coverage |
| Test: | app.info | Lines: | 33 | 0 | 0.0 %
| Date: | 2012-07-07 | Functions: | 1 | 0 | 0.0 %

           1                 : /* -*- Mode: C++; tab-width: 20; 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 Mozilla Corporation code.
          16                 :  *
          17                 :  * The Initial Developer of the Original Code is Mozilla Foundation.
          18                 :  * Portions created by the Initial Developer are Copyright (C) 2011
          19                 :  * the Initial Developer. All Rights Reserved.
          20                 :  *
          21                 :  * Contributor(s):
          22                 :  *   Matt Woodrow <mwoodrow@mozilla.com>
          23                 :  *
          24                 :  * Alternatively, the contents of this file may be used under the terms of
          25                 :  * either the GNU General Public License Version 2 or later (the "GPL"), or
          26                 :  * 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 MOZILLA_GFX_PATHHELPERS_H_
          39                 : #define MOZILLA_GFX_PATHHELPERS_H_
          40                 :
          41                 : #include "2D.h"
          42                 :
          43                 : #ifndef M_PI
          44                 : #define M_PI 3.14159265358979323846
          45                 : #endif
          46                 :
          47                 : namespace mozilla {
          48                 : namespace gfx {
          49                 :
          50                 : template <typename T>
          51               0 : void ArcToBezier(T* aSink, const Point &aOrigin, float aRadius, float aStartAngle,
          52                 :                  float aEndAngle, bool aAntiClockwise)
          53                 : {
          54                 :   Point startPoint(aOrigin.x + cos(aStartAngle) * aRadius,
          55               0 :                    aOrigin.y + sin(aStartAngle) * aRadius);
          56                 :
          57               0 :   aSink->LineTo(startPoint);
          58                 :
          59                 :   // Clockwise we always sweep from the smaller to the larger angle, ccw
          60                 :   // it's vice versa.
          61               0 :   if (!aAntiClockwise && (aEndAngle < aStartAngle)) {
          62               0 :     Float correction = ceil((aStartAngle - aEndAngle) / (2.0f * M_PI));
          63               0 :     aEndAngle += correction * 2.0f * M_PI;
          64               0 :   } else if (aAntiClockwise && (aStartAngle < aEndAngle)) {
          65               0 :     Float correction = ceil((aEndAngle - aStartAngle) / (2.0f * M_PI));
          66               0 :     aStartAngle += correction * 2.0f * M_PI;
          67                 :   }
          68                 :
          69                 :   // Sweeping more than 2 * pi is a full circle.
          70               0 :   if (!aAntiClockwise && (aEndAngle - aStartAngle > 2 * M_PI)) {
          71               0 :     aEndAngle = aStartAngle + 2.0f * M_PI;
          72               0 :   } else if (aAntiClockwise && (aStartAngle - aEndAngle > 2.0f * M_PI)) {
          73               0 :     aEndAngle = aStartAngle - 2.0f * M_PI;
          74                 :   }
          75                 :
          76                 :   // Calculate the total arc we're going to sweep.
          77               0 :   Float arcSweepLeft = fabs(aEndAngle - aStartAngle);
          78                 :
          79               0 :   Float sweepDirection = aAntiClockwise ? -1.0f : 1.0f;
          80                 :
          81               0 :   Float currentStartAngle = aStartAngle;
          82                 :
          83               0 :   while (arcSweepLeft > 0) {
          84                 :     // We guarantee here the current point is the start point of the next
          85                 :     // curve segment.
          86                 :     Float currentEndAngle;
          87                 :
          88               0 :     if (arcSweepLeft > M_PI / 2.0f) {
          89               0 :       currentEndAngle = currentStartAngle + M_PI / 2.0f * sweepDirection;
          90                 :     } else {
          91               0 :       currentEndAngle = currentStartAngle + arcSweepLeft * sweepDirection;
          92                 :     }
          93                 :
          94                 :     Point currentStartPoint(aOrigin.x + cos(currentStartAngle) * aRadius,
          95               0 :                             aOrigin.y + sin(currentStartAngle) * aRadius);
          96                 :     Point currentEndPoint(aOrigin.x + cos(currentEndAngle) * aRadius,
          97               0 :                           aOrigin.y + sin(currentEndAngle) * aRadius);
          98                 :
          99                 :     // Calculate kappa constant for partial curve. The sign of angle in the
         100                 :     // tangent will actually ensure this is negative for a counter clockwise
         101                 :     // sweep, so changing signs later isn't needed.
         102               0 :     Float kappa = (4.0f / 3.0f) * tan((currentEndAngle - currentStartAngle) / 4.0f) * aRadius;
         103                 :
         104               0 :     Point tangentStart(-sin(currentStartAngle), cos(currentStartAngle));
         105               0 :     Point cp1 = currentStartPoint;
         106               0 :     cp1 += tangentStart * kappa;
         107                 :
         108               0 :     Point revTangentEnd(sin(currentEndAngle), -cos(currentEndAngle));
         109               0 :     Point cp2 = currentEndPoint;
         110               0 :     cp2 += revTangentEnd * kappa;
         111                 :
         112               0 :     aSink->BezierTo(cp1, cp2, currentEndPoint);
         113                 :
         114               0 :     arcSweepLeft -= M_PI / 2.0f;
         115               0 :     currentStartAngle = currentEndAngle;
         116                 :   }
         117               0 : }
         118                 :
         119                 : }
         120                 : }
         121                 :
         122                 : #endif /* MOZILLA_GFX_PATHHELPERS_H_ */

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