LCOV - code coverage report
Current view: directory - content/svg/content/src - DOMSVGMatrix.h (source / functions) Found Hit Coverage
Test: app.info Lines: 18 1 5.6 %
Date: 2012-06-02 Functions: 12 1 8.3 %

       1                 : /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
       2                 :  * vim: sw=2 ts=2 et lcs=trail\:.,tab\:>~ :
       3                 :  * ***** BEGIN LICENSE BLOCK *****
       4                 :  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
       5                 :  *
       6                 :  * The contents of this file are subject to the Mozilla Public License Version
       7                 :  * 1.1 (the "License"); you may not use this file except in compliance with
       8                 :  * the License. You may obtain a copy of the License at
       9                 :  * http://www.mozilla.org/MPL/
      10                 :  *
      11                 :  * Software distributed under the License is distributed on an "AS IS" basis,
      12                 :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
      13                 :  * for the specific language governing rights and limitations under the
      14                 :  * License.
      15                 :  *
      16                 :  * The Original Code is the Mozilla SVG project.
      17                 :  *
      18                 :  * The Initial Developer of the Original Code is
      19                 :  * Crocodile Clips Ltd..
      20                 :  * Portions created by the Initial Developer are Copyright (C) 2001
      21                 :  * the Initial Developer. All Rights Reserved.
      22                 :  *
      23                 :  * Contributor(s):
      24                 :  *   Alex Fritze <alex.fritze@crocodile-clips.com> (original author)
      25                 :  *   Brian Birtles <birtles@gmail.com>
      26                 :  *
      27                 :  * Alternatively, the contents of this file may be used under the terms of
      28                 :  * either of the GNU General Public License Version 2 or later (the "GPL"),
      29                 :  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
      30                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
      31                 :  * of those above. If you wish to allow use of your version of this file only
      32                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
      33                 :  * use your version of this file under the terms of the MPL, indicate your
      34                 :  * decision by deleting the provisions above and replace them with the notice
      35                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
      36                 :  * the provisions above, a recipient may use your version of this file under
      37                 :  * the terms of any one of the MPL, the GPL or the LGPL.
      38                 :  *
      39                 :  * ***** END LICENSE BLOCK ***** */
      40                 : 
      41                 : /**
      42                 :  * Notes on transforms in Mozilla and the SVG code.
      43                 :  *
      44                 :  * It's important to note that the matrix convention used in the SVG standard
      45                 :  * is the opposite convention to the one used in the Mozilla code or, more
      46                 :  * specifically, the convention used in Thebes code (code using gfxMatrix).
      47                 :  * Whereas the SVG standard uses the column vector convention, Thebes code uses
      48                 :  * the row vector convention. Thus, whereas in the SVG standard you have
      49                 :  * [M1][M2][M3]|p|, in Thebes you have |p|'[M3]'[M2]'[M1]'. In other words, the
      50                 :  * following are equivalent:
      51                 :  *
      52                 :  *                       / a1 c1 tx1 \   / a2 c2 tx2 \   / a3 c3 tx3 \   / x \
      53                 :  * SVG:                  | b1 d1 ty1 |   | b2 d2 ty2 |   | b3 d3 ty3 |   | y |
      54                 :  *                       \  0  0   1 /   \  0  0   1 /   \  0  0   1 /   \ 1 /
      55                 :  *
      56                 :  *                       /  a3  b3 0 \   /  a2  b2 0 \   /  a1  b1 0 \
      57                 :  * Thebes:   [ x y 1 ]   |  c3  d3 0 |   |  c2  d2 0 |   |  c1  d1 0 |
      58                 :  *                       \ tx3 ty3 1 /   \ tx2 ty2 1 /   \ tx1 ty1 1 /
      59                 :  *
      60                 :  * Because the Thebes representation of a transform is the transpose of the SVG
      61                 :  * representation, our transform order must be reversed when representing SVG
      62                 :  * transforms using gfxMatrix in the SVG code. Since the SVG implementation
      63                 :  * stores and obtains matrices in SVG order, to do this we must pre-multiply
      64                 :  * gfxMatrix objects that represent SVG transforms instead of post-multiplying
      65                 :  * them as we would for matrices using SVG's column vector convention.
      66                 :  * Pre-multiplying may look wrong if you're only familiar with the SVG
      67                 :  * convention, but in that case hopefully the above explanation clears things
      68                 :  * up.
      69                 :  */
      70                 : 
      71                 : #ifndef MOZILLA_DOMSVGMATRIX_H__
      72                 : #define MOZILLA_DOMSVGMATRIX_H__
      73                 : 
      74                 : #include "DOMSVGTransform.h"
      75                 : #include "gfxMatrix.h"
      76                 : #include "nsAutoPtr.h"
      77                 : #include "nsCycleCollectionParticipant.h"
      78                 : #include "nsIDOMSVGMatrix.h"
      79                 : 
      80                 : // We make DOMSVGMatrix a pseudo-interface to allow us to QI to it in order
      81                 : // to check that the objects that scripts pass in are our *native* matrix
      82                 : // objects.
      83                 : //
      84                 : // {633419E5-7E88-4C3E-8A9A-856F635E90A3}
      85                 : #define MOZILLA_DOMSVGMATRIX_IID \
      86                 :   { 0x633419E5, 0x7E88, 0x4C3E, \
      87                 :     { 0x8A, 0x9A, 0x85, 0x6F, 0x63, 0x5E, 0x90, 0xA3 } }
      88                 : 
      89                 : namespace mozilla {
      90                 : 
      91                 : /**
      92                 :  * DOM wrapper for an SVG matrix.
      93                 :  */
      94                 : class DOMSVGMatrix : public nsIDOMSVGMatrix
      95                 : {
      96                 : public:
      97                 :   NS_DECLARE_STATIC_IID_ACCESSOR(MOZILLA_DOMSVGMATRIX_IID)
      98               0 :   NS_DECL_CYCLE_COLLECTING_ISUPPORTS
      99            1464 :   NS_DECL_CYCLE_COLLECTION_CLASS(DOMSVGMatrix)
     100                 :   NS_DECL_NSIDOMSVGMATRIX
     101                 : 
     102                 :   /**
     103                 :    * Ctor for DOMSVGMatrix objects that belong to a DOMSVGTransform.
     104                 :    */
     105               0 :   DOMSVGMatrix(DOMSVGTransform& aTransform) : mTransform(&aTransform) { }
     106                 : 
     107                 :   /**
     108                 :    * Ctors for DOMSVGMatrix objects created independently of a DOMSVGTransform.
     109                 :    */
     110               0 :   DOMSVGMatrix() { } // Default ctor for gfxMatrix will produce identity mx
     111               0 :   DOMSVGMatrix(const gfxMatrix &aMatrix) : mMatrix(aMatrix) { }
     112               0 :   ~DOMSVGMatrix() {
     113               0 :     if (mTransform) {
     114               0 :       mTransform->ClearMatrixTearoff(this);
     115                 :     }
     116               0 :   }
     117                 : 
     118               0 :   const gfxMatrix& Matrix() const {
     119               0 :     return mTransform ? mTransform->Matrix() : mMatrix;
     120                 :   }
     121                 : 
     122                 : private:
     123               0 :   void SetMatrix(const gfxMatrix& aMatrix) {
     124               0 :     if (mTransform) {
     125               0 :       mTransform->SetMatrix(aMatrix);
     126                 :     } else {
     127               0 :       mMatrix = aMatrix;
     128                 :     }
     129               0 :   }
     130                 : 
     131               0 :   bool IsAnimVal() const {
     132               0 :     return mTransform ? mTransform->IsAnimVal() : false;
     133                 :   }
     134                 : 
     135                 :   nsRefPtr<DOMSVGTransform> mTransform;
     136                 : 
     137                 :   // Typically we operate on the matrix data accessed via mTransform but for
     138                 :   // matrices that exist independently of an SVGTransform we use mMatrix below.
     139                 :   gfxMatrix mMatrix;
     140                 : };
     141                 : 
     142                 : NS_DEFINE_STATIC_IID_ACCESSOR(DOMSVGMatrix, MOZILLA_DOMSVGMATRIX_IID)
     143                 : 
     144                 : } // namespace mozilla
     145                 : 
     146                 : #endif // MOZILLA_DOMSVGMATRIX_H__

Generated by: LCOV version 1.7