src/third_party/WebKit/Source/core/rendering/svg/SVGSubpathData.h

   1 /*
   2  * Copyright (C) 2012 Google, Inc.
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Library General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Library General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Library General Public License
  15  * along with this library; see the file COPYING.LIB.  If not, write to
  16  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  17  * Boston, MA 02110-1301, USA.
  18  */
  19
  20 #ifndef SVGSubpathData_h
  21 #define SVGSubpathData_h
  22
  23 #include "platform/graphics/Path.h"
  24 #include "wtf/Vector.h"
  25
  26 namespace WebCore {
  27
  28 class SVGSubpathData {
  29 public:
  30     SVGSubpathData(Vector<FloatPoint>& zeroLengthSubpathLocations)
  31         : m_zeroLengthSubpathLocations(zeroLengthSubpathLocations)
  32         , m_haveSeenMoveOnly(true)
  33         , m_pathIsZeroLength(true)
  34     {
  35         m_lastPoint.set(0, 0);
  36         m_movePoint.set(0, 0);
  37     }
  38
  39     static void updateFromPathElement(void* info, const PathElement* element)
  40     {
  41         SVGSubpathData* subpathFinder = static_cast<SVGSubpathData*>(info);
  42         switch (element->type) {
  43         case PathElementMoveToPoint:
  44             if (subpathFinder->m_pathIsZeroLength && !subpathFinder->m_haveSeenMoveOnly)
  45                 subpathFinder->m_zeroLengthSubpathLocations.append(subpathFinder->m_lastPoint);
  46             subpathFinder->m_lastPoint = subpathFinder->m_movePoint = element->points[0];
  47             subpathFinder->m_haveSeenMoveOnly = true;
  48             subpathFinder->m_pathIsZeroLength = true;
  49             break;
  50         case PathElementAddLineToPoint:
  51             if (subpathFinder->m_lastPoint != element->points[0]) {
  52                 subpathFinder->m_pathIsZeroLength = false;
  53                 subpathFinder->m_lastPoint = element->points[0];
  54             }
  55             subpathFinder->m_haveSeenMoveOnly = false;
  56             break;
  57         case PathElementAddQuadCurveToPoint:
  58             if (subpathFinder->m_lastPoint != element->points[0] || element->points[0] != element->points[1]) {
  59                 subpathFinder->m_pathIsZeroLength = false;
  60                 subpathFinder->m_lastPoint = element->points[1];
  61             }
  62             subpathFinder->m_haveSeenMoveOnly = false;
  63             break;
  64         case PathElementAddCurveToPoint:
  65             if (subpathFinder->m_lastPoint != element->points[0] || element->points[0] != element->points[1] || element->points[1] != element->points[2]) {
  66                 subpathFinder->m_pathIsZeroLength = false;
  67                 subpathFinder->m_lastPoint = element->points[2];
  68             }
  69             subpathFinder->m_haveSeenMoveOnly = false;
  70             break;
  71         case PathElementCloseSubpath:
  72             if (subpathFinder->m_pathIsZeroLength)
  73                 subpathFinder->m_zeroLengthSubpathLocations.append(subpathFinder->m_lastPoint);
  74             subpathFinder->m_haveSeenMoveOnly = true; // This is an implicit move for the next element
  75             subpathFinder->m_pathIsZeroLength = true; // A new sub-path also starts here
  76             subpathFinder->m_lastPoint = subpathFinder->m_movePoint;
  77             break;
  78         }
  79     }
  80
  81     void pathIsDone()
  82     {
  83         if (m_pathIsZeroLength && !m_haveSeenMoveOnly)
  84             m_zeroLengthSubpathLocations.append(m_lastPoint);
  85     }
  86
  87 private:
  88     Vector<FloatPoint>& m_zeroLengthSubpathLocations;
  89     FloatPoint m_lastPoint;
  90     FloatPoint m_movePoint;
  91     bool m_haveSeenMoveOnly;
  92     bool m_pathIsZeroLength;
  93 };
  94
  95 }
  96
  97 #endif // SVGSubpathData_h