LCOV - code coverage report
Current view: directory - gfx/src - nsRegion.h (source / functions) Found Hit Coverage
Test: app.info Lines: 92 38 41.3 %
Date: 2012-06-02 Functions: 49 20 40.8 %

       1                 : /* ***** BEGIN LICENSE BLOCK *****
       2                 :  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
       3                 :  *
       4                 :  * The contents of this file are subject to the Mozilla Public License Version
       5                 :  * 1.1 (the "License"); you may not use this file except in compliance with
       6                 :  * the License. You may obtain a copy of the License at
       7                 :  * http://www.mozilla.org/MPL/
       8                 :  *
       9                 :  * Software distributed under the License is distributed on an "AS IS" basis,
      10                 :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
      11                 :  * for the specific language governing rights and limitations under the
      12                 :  * License.
      13                 :  *
      14                 :  * The Original Code is mozilla.org code.
      15                 :  *
      16                 :  * The Initial Developer of the Original Code is
      17                 :  * Dainis Jonitis, <Dainis_Jonitis@swh-t.lv>.
      18                 :  * Portions created by the Initial Developer are Copyright (C) 2001
      19                 :  * the Initial Developer. All Rights Reserved.
      20                 :  *
      21                 :  * Contributor(s):
      22                 :  *
      23                 :  * Alternatively, the contents of this file may be used under the terms of
      24                 :  * either of the GNU General Public License Version 2 or later (the "GPL"),
      25                 :  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
      26                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
      27                 :  * of those above. If you wish to allow use of your version of this file only
      28                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
      29                 :  * use your version of this file under the terms of the MPL, indicate your
      30                 :  * decision by deleting the provisions above and replace them with the notice
      31                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
      32                 :  * the provisions above, a recipient may use your version of this file under
      33                 :  * the terms of any one of the MPL, the GPL or the LGPL.
      34                 :  *
      35                 :  * ***** END LICENSE BLOCK ***** */
      36                 : 
      37                 : 
      38                 : #ifndef nsRegion_h__
      39                 : #define nsRegion_h__
      40                 : 
      41                 : 
      42                 : #include "nsRect.h"
      43                 : #include "nsPoint.h"
      44                 : 
      45                 : class nsIntRegion;
      46                 : 
      47                 : /**
      48                 :  * Implementation of regions.
      49                 :  * A region is represented as circular double-linked list of nsRegion::RgnRect structures.
      50                 :  * Rectangles in this list do not overlap and are sorted by (y, x) coordinates.
      51                 :  *
      52                 :  * nsRegions use nscoord coordinates and nsRects.
      53                 :  */
      54                 : class NS_GFX nsRegion
      55                 : {
      56                 :   friend class nsRegionRectIterator;
      57                 :   friend class RgnRectMemoryAllocator;
      58                 : 
      59                 : 
      60                 : // Special version of nsRect structure for speed optimizations in nsRegion code.
      61                 : // Most important functions could be made inline and be sure that passed rectangles
      62                 : // will always be non-empty.
      63                 : // 
      64                 : // Do not add any new member variables to this structure! 
      65                 : // Otherwise it will break casts from nsRect to nsRectFast, which expect data parts to be identical.
      66                 :   struct nsRectFast : public nsRect
      67               5 :   {
      68               3 :     nsRectFast () {}      // No need to call parent constructor to set default values
      69               0 :     nsRectFast (PRInt32 aX, PRInt32 aY, PRInt32 aWidth, PRInt32 aHeight) : nsRect (aX, aY, aWidth, aHeight) {}
      70                 :     nsRectFast (const nsRect& aRect) : nsRect (aRect) {}
      71                 : 
      72                 :     // Override nsRect methods to make them inline. Do not check for emptiness.
      73                 :     inline bool Contains (const nsRect& aRect) const;
      74                 :     inline bool Intersects (const nsRect& aRect) const;
      75                 :     inline bool IntersectRect (const nsRect& aRect1, const nsRect& aRect2);
      76                 :     inline void UnionRect (const nsRect& aRect1, const nsRect& aRect2);
      77                 :   };
      78                 : 
      79                 : 
      80                 :   struct RgnRect : public nsRectFast
      81               3 :   {
      82                 :     RgnRect* prev;
      83                 :     RgnRect* next;
      84                 : 
      85               2 :     RgnRect () {}                           // No need to call parent constructor to set default values
      86               0 :     RgnRect (PRInt32 aX, PRInt32 aY, PRInt32 aWidth, PRInt32 aHeight) : nsRectFast (aX, aY, aWidth, aHeight) {}
      87               1 :     RgnRect (const nsRectFast& aRect) : nsRectFast (aRect) {}
      88                 : 
      89                 :     void* operator new (size_t) CPP_THROW_NEW;
      90                 :     void  operator delete (void* aRect, size_t);
      91                 : 
      92               1 :     RgnRect& operator = (const RgnRect& aRect)      // Do not overwrite prev/next pointers
      93                 :     {
      94               1 :       x = aRect.x;
      95               1 :       y = aRect.y;
      96               1 :       width = aRect.width;
      97               1 :       height = aRect.height;
      98               1 :       return *this;
      99                 :     }
     100                 :   };
     101                 : 
     102                 : 
     103                 : public:
     104               1 :   nsRegion () { Init (); }
     105               0 :   nsRegion (const nsRect& aRect) { Init (); Copy (aRect); }
     106               0 :   nsRegion (const nsRegion& aRegion) { Init (); Copy (aRegion); }
     107               1 :  ~nsRegion () { SetToElements (0); }
     108               0 :   nsRegion& operator = (const nsRect& aRect) { Copy (aRect); return *this; }
     109               0 :   nsRegion& operator = (const nsRegion& aRegion) { Copy (aRegion); return *this; }
     110                 : 
     111                 : 
     112                 :   nsRegion& And  (const nsRegion& aRgn1,   const nsRegion& aRgn2);
     113                 :   nsRegion& And  (const nsRegion& aRegion, const nsRect& aRect);
     114                 :   nsRegion& And  (const nsRect& aRect, const nsRegion& aRegion)
     115                 :   {
     116                 :     return  And  (aRegion, aRect);
     117                 :   }
     118                 :   nsRegion& And  (const nsRect& aRect1, const nsRect& aRect2)
     119                 :   {
     120                 :     nsRect TmpRect;
     121                 : 
     122                 :     TmpRect.IntersectRect (aRect1, aRect2);
     123                 :     return Copy (TmpRect);
     124                 :   }
     125                 : 
     126                 :   nsRegion& Or   (const nsRegion& aRgn1,   const nsRegion& aRgn2);
     127                 :   nsRegion& Or   (const nsRegion& aRegion, const nsRect& aRect);
     128                 :   nsRegion& Or   (const nsRect& aRect, const nsRegion& aRegion)
     129                 :   {
     130                 :     return  Or   (aRegion, aRect);
     131                 :   }
     132                 :   nsRegion& Or   (const nsRect& aRect1, const nsRect& aRect2)
     133                 :   {
     134                 :     Copy (aRect1);
     135                 :     return Or (*this, aRect2);
     136                 :   }
     137                 : 
     138                 :   nsRegion& Xor  (const nsRegion& aRgn1,   const nsRegion& aRgn2);
     139                 :   nsRegion& Xor  (const nsRegion& aRegion, const nsRect& aRect);
     140                 :   nsRegion& Xor  (const nsRect& aRect, const nsRegion& aRegion)
     141                 :   {
     142                 :     return  Xor  (aRegion, aRect);
     143                 :   }
     144                 :   nsRegion& Xor  (const nsRect& aRect1, const nsRect& aRect2)
     145                 :   {
     146                 :     Copy (aRect1);
     147                 :     return Xor (*this, aRect2);
     148                 :   }
     149                 : 
     150                 :   nsRegion& Sub  (const nsRegion& aRgn1,   const nsRegion& aRgn2);
     151                 :   nsRegion& Sub  (const nsRegion& aRegion, const nsRect& aRect);
     152               0 :   nsRegion& Sub  (const nsRect& aRect, const nsRegion& aRegion)
     153                 :   {
     154               0 :     return Sub (nsRegion (aRect), aRegion);
     155                 :   }
     156                 :   nsRegion& Sub  (const nsRect& aRect1, const nsRect& aRect2)
     157                 :   {
     158                 :     Copy (aRect1);
     159                 :     return Sub (*this, aRect2);
     160                 :   }
     161                 : 
     162                 :   bool Contains (const nsRect& aRect) const;
     163                 :   bool Contains (const nsRegion& aRgn) const;
     164                 :   bool Intersects (const nsRect& aRect) const;
     165                 : 
     166               0 :   void MoveBy (PRInt32 aXOffset, PRInt32 aYOffset)
     167                 :   {
     168               0 :     MoveBy (nsPoint (aXOffset, aYOffset));
     169               0 :   }
     170                 :   void MoveBy (nsPoint aPt);
     171               0 :   void SetEmpty ()
     172                 :   {
     173               0 :     SetToElements (0);
     174               0 :     mBoundRect.SetRect (0, 0, 0, 0);
     175               0 :   }
     176                 : 
     177               0 :   bool IsEmpty () const { return mRectCount == 0; }
     178               0 :   bool IsComplex () const { return mRectCount > 1; }
     179                 :   bool IsEqual (const nsRegion& aRegion) const;
     180               3 :   PRUint32 GetNumRects () const { return mRectCount; }
     181               0 :   const nsRect& GetBounds () const { return mBoundRect; }
     182                 :   // Converts this region from aFromAPP, an appunits per pixel ratio, to
     183                 :   // aToAPP. This applies nsRect::ConvertAppUnitsRoundOut/In to each rect of
     184                 :   // the region.
     185                 :   nsRegion ConvertAppUnitsRoundOut (PRInt32 aFromAPP, PRInt32 aToAPP) const;
     186                 :   nsRegion ConvertAppUnitsRoundIn (PRInt32 aFromAPP, PRInt32 aToAPP) const;
     187                 :   nsRegion& ScaleRoundOut(float aXScale, float aYScale);
     188                 :   nsRegion& ScaleInverseRoundOut(float aXScale, float aYScale);
     189                 :   nsIntRegion ScaleToOutsidePixels (float aXScale, float aYScale, nscoord aAppUnitsPerPixel) const;
     190                 :   nsIntRegion ToOutsidePixels (nscoord aAppUnitsPerPixel) const;
     191                 :   nsIntRegion ToNearestPixels (nscoord aAppUnitsPerPixel) const;
     192                 : 
     193                 :   /**
     194                 :    * Gets the largest rectangle contained in the region.
     195                 :    * @param aContainingRect if non-empty, we choose a rectangle that
     196                 :    * maximizes the area intersecting with aContainingRect (and break ties by
     197                 :    * then choosing the largest rectangle overall)
     198                 :    */
     199                 :   nsRect GetLargestRectangle (const nsRect& aContainingRect = nsRect()) const;
     200                 : 
     201                 :   /**
     202                 :    * Make sure the region has at most aMaxRects by adding area to it
     203                 :    * if necessary. The simplified region will be a superset of the
     204                 :    * original region. The simplified region's bounding box will be
     205                 :    * the same as for the current region.
     206                 :    */
     207                 :   void SimplifyOutward (PRUint32 aMaxRects);
     208                 :   /**
     209                 :    * Make sure the region has at most aMaxRects by removing area from
     210                 :    * it if necessary. The simplified region will be a subset of the
     211                 :    * original region.
     212                 :    */
     213                 :   void SimplifyInward (PRUint32 aMaxRects);
     214                 :   /**
     215                 :    * Efficiently try to remove a rectangle from this region. The actual
     216                 :    * area removed could be some sub-area contained by the rectangle
     217                 :    * (even possibly nothing at all).
     218                 :    * 
     219                 :    * We remove all rectangles that are contained by aRect.
     220                 :    */
     221                 :   void SimpleSubtract (const nsRect& aRect);
     222                 :   /**
     223                 :    * Efficiently try to remove a region from this region. The actual
     224                 :    * area removed could be some sub-area contained by aRegion
     225                 :    * (even possibly nothing at all).
     226                 :    * 
     227                 :    * We remove all rectangles of this region that are contained by
     228                 :    * a rectangle of aRegion.
     229                 :    */
     230                 :   void SimpleSubtract (const nsRegion& aRegion);
     231                 : 
     232                 :   /**
     233                 :    * Initialize any static data associated with nsRegion.
     234                 :    */
     235                 :   static nsresult InitStatic();
     236                 : 
     237                 :   /**
     238                 :    * Deinitialize static data.
     239                 :    */
     240                 :   static void ShutdownStatic();
     241                 : 
     242                 : private:
     243                 :   PRUint32    mRectCount;
     244                 :   RgnRect*    mCurRect;
     245                 :   RgnRect     mRectListHead;
     246                 :   nsRectFast  mBoundRect;
     247                 : 
     248                 :   void Init ();
     249                 :   nsRegion& Copy (const nsRegion& aRegion);
     250                 :   nsRegion& Copy (const nsRect& aRect);
     251                 :   void InsertBefore (RgnRect* aNewRect, RgnRect* aRelativeRect);
     252                 :   void InsertAfter (RgnRect* aNewRect, RgnRect* aRelativeRect);
     253                 :   void SetToElements (PRUint32 aCount);
     254                 :   RgnRect* Remove (RgnRect* aRect);
     255                 :   void InsertInPlace (RgnRect* aRect, bool aOptimizeOnFly = false);
     256                 :   inline void SaveLinkChain ();
     257                 :   inline void RestoreLinkChain ();
     258                 :   void Optimize ();
     259                 :   void SubRegion (const nsRegion& aRegion, nsRegion& aResult) const;
     260                 :   void SubRect (const nsRectFast& aRect, nsRegion& aResult, nsRegion& aCompleted) const;
     261               0 :   void SubRect (const nsRectFast& aRect, nsRegion& aResult) const
     262               0 :   {    SubRect (aRect, aResult, aResult);  }
     263                 :   void Merge (const nsRegion& aRgn1, const nsRegion& aRgn2);
     264                 :   void MoveInto (nsRegion& aDestRegion, const RgnRect* aStartRect);
     265               0 :   void MoveInto (nsRegion& aDestRegion)
     266               0 :   {    MoveInto (aDestRegion, mRectListHead.next);  }
     267                 :   nsIntRegion ToPixels(nscoord aAppUnitsPerPixel, bool aOutsidePixels) const;
     268                 : };
     269                 : 
     270                 : 
     271                 : 
     272                 : // Allow read-only access to region rectangles by iterating the list
     273                 : 
     274                 : class NS_GFX nsRegionRectIterator
     275                 : {
     276                 :   const nsRegion*  mRegion;
     277                 :   const nsRegion::RgnRect* mCurPtr;
     278                 : 
     279                 : public:
     280               2 :   nsRegionRectIterator (const nsRegion& aRegion)
     281                 :   {
     282               2 :     mRegion = &aRegion;
     283               2 :     mCurPtr = &aRegion.mRectListHead;
     284               2 :   }
     285                 : 
     286               5 :   const nsRect* Next ()
     287                 :   {
     288               5 :     mCurPtr = mCurPtr->next;
     289               5 :     return (mCurPtr != &mRegion->mRectListHead) ? mCurPtr : nsnull;
     290                 :   }
     291                 : 
     292                 :   const nsRect* Prev ()
     293                 :   {
     294                 :     mCurPtr = mCurPtr->prev;
     295                 :     return (mCurPtr != &mRegion->mRectListHead) ? mCurPtr : nsnull;
     296                 :   }
     297                 : 
     298               0 :   void Reset ()
     299                 :   {
     300               0 :     mCurPtr = &mRegion->mRectListHead;
     301               0 :   }
     302                 : };
     303                 : 
     304                 : /**
     305                 :  * nsIntRegions use PRInt32 coordinates and nsIntRects.
     306                 :  */
     307                 : class NS_GFX nsIntRegion
     308               1 : {
     309                 :   friend class nsIntRegionRectIterator;
     310                 : 
     311                 : public:
     312               1 :   nsIntRegion () {}
     313                 :   nsIntRegion (const nsIntRect& aRect) : mImpl (ToRect(aRect)) {}
     314                 :   nsIntRegion (const nsIntRegion& aRegion) : mImpl (aRegion.mImpl) {}
     315               0 :   nsIntRegion& operator = (const nsIntRect& aRect) { mImpl = ToRect (aRect); return *this; }
     316               0 :   nsIntRegion& operator = (const nsIntRegion& aRegion) { mImpl = aRegion.mImpl; return *this; }
     317                 : 
     318                 :   bool operator==(const nsIntRegion& aRgn) const
     319                 :   {
     320                 :     return IsEqual(aRgn);
     321                 :   }
     322                 : 
     323               0 :   nsIntRegion& And  (const nsIntRegion& aRgn1,   const nsIntRegion& aRgn2)
     324                 :   {
     325               0 :     mImpl.And (aRgn1.mImpl, aRgn2.mImpl);
     326               0 :     return *this;
     327                 :   }
     328               0 :   nsIntRegion& And  (const nsIntRegion& aRegion, const nsIntRect& aRect)
     329                 :   {
     330               0 :     mImpl.And (aRegion.mImpl, ToRect (aRect));
     331               0 :     return *this;
     332                 :   }
     333                 :   nsIntRegion& And  (const nsIntRect& aRect, const nsIntRegion& aRegion)
     334                 :   {
     335                 :     return  And  (aRegion, aRect);
     336                 :   }
     337                 :   nsIntRegion& And  (const nsIntRect& aRect1, const nsIntRect& aRect2)
     338                 :   {
     339                 :     nsIntRect TmpRect;
     340                 : 
     341                 :     TmpRect.IntersectRect (aRect1, aRect2);
     342                 :     mImpl = ToRect (TmpRect);
     343                 :     return *this;
     344                 :   }
     345                 : 
     346               0 :   nsIntRegion& Or   (const nsIntRegion& aRgn1,   const nsIntRegion& aRgn2)
     347                 :   {
     348               0 :     mImpl.Or (aRgn1.mImpl, aRgn2.mImpl);
     349               0 :     return *this;
     350                 :   }
     351               2 :   nsIntRegion& Or   (const nsIntRegion& aRegion, const nsIntRect& aRect)
     352                 :   {
     353               2 :     mImpl.Or (aRegion.mImpl, ToRect (aRect));
     354               2 :     return *this;
     355                 :   }
     356                 :   nsIntRegion& Or   (const nsIntRect& aRect, const nsIntRegion& aRegion)
     357                 :   {
     358                 :     return  Or   (aRegion, aRect);
     359                 :   }
     360                 :   nsIntRegion& Or   (const nsIntRect& aRect1, const nsIntRect& aRect2)
     361                 :   {
     362                 :     mImpl = ToRect (aRect1);
     363                 :     return Or (*this, aRect2);
     364                 :   }
     365                 : 
     366                 :   nsIntRegion& Xor  (const nsIntRegion& aRgn1,   const nsIntRegion& aRgn2)
     367                 :   {
     368                 :     mImpl.Xor (aRgn1.mImpl, aRgn2.mImpl);
     369                 :     return *this;
     370                 :   }
     371                 :   nsIntRegion& Xor  (const nsIntRegion& aRegion, const nsIntRect& aRect)
     372                 :   {
     373                 :     mImpl.Xor (aRegion.mImpl, ToRect (aRect));
     374                 :     return *this;
     375                 :   }
     376                 :   nsIntRegion& Xor  (const nsIntRect& aRect, const nsIntRegion& aRegion)
     377                 :   {
     378                 :     return  Xor  (aRegion, aRect);
     379                 :   }
     380                 :   nsIntRegion& Xor  (const nsIntRect& aRect1, const nsIntRect& aRect2)
     381                 :   {
     382                 :     mImpl = ToRect (aRect1);
     383                 :     return Xor (*this, aRect2);
     384                 :   }
     385                 : 
     386               0 :   nsIntRegion& Sub  (const nsIntRegion& aRgn1,   const nsIntRegion& aRgn2)
     387                 :   {
     388               0 :     mImpl.Sub (aRgn1.mImpl, aRgn2.mImpl);
     389               0 :     return *this;
     390                 :   }
     391               0 :   nsIntRegion& Sub  (const nsIntRegion& aRegion, const nsIntRect& aRect)
     392                 :   {
     393               0 :     mImpl.Sub (aRegion.mImpl, ToRect (aRect));
     394               0 :     return *this;
     395                 :   }
     396                 :   nsIntRegion& Sub  (const nsIntRect& aRect, const nsIntRegion& aRegion)
     397                 :   {
     398                 :     return Sub (nsIntRegion (aRect), aRegion);
     399                 :   }
     400                 :   nsIntRegion& Sub  (const nsIntRect& aRect1, const nsIntRect& aRect2)
     401                 :   {
     402                 :     mImpl = ToRect (aRect1);
     403                 :     return Sub (*this, aRect2);
     404                 :   }
     405                 : 
     406               0 :   bool Contains (const nsIntRect& aRect) const
     407                 :   {
     408               0 :     return mImpl.Contains (ToRect (aRect));
     409                 :   }
     410                 :   bool Contains (const nsIntRegion& aRgn) const
     411                 :   {
     412                 :     return mImpl.Contains (aRgn.mImpl);
     413                 :   }
     414                 :   bool Intersects (const nsIntRect& aRect) const
     415                 :   {
     416                 :     return mImpl.Intersects (ToRect (aRect));
     417                 :   }
     418                 : 
     419               0 :   void MoveBy (PRInt32 aXOffset, PRInt32 aYOffset)
     420                 :   {
     421               0 :     MoveBy (nsIntPoint (aXOffset, aYOffset));
     422               0 :   }
     423               0 :   void MoveBy (nsIntPoint aPt)
     424                 :   {
     425               0 :     mImpl.MoveBy (aPt.x, aPt.y);
     426               0 :   }
     427                 :   void SetEmpty ()
     428                 :   {
     429                 :     mImpl.SetEmpty  ();
     430                 :   }
     431                 : 
     432               0 :   bool IsEmpty () const { return mImpl.IsEmpty (); }
     433                 :   bool IsComplex () const { return mImpl.IsComplex (); }
     434               0 :   bool IsEqual (const nsIntRegion& aRegion) const
     435                 :   {
     436               0 :     return mImpl.IsEqual (aRegion.mImpl);
     437                 :   }
     438               3 :   PRUint32 GetNumRects () const { return mImpl.GetNumRects (); }
     439               0 :   nsIntRect GetBounds () const { return FromRect (mImpl.GetBounds ()); }
     440                 :   nsRegion ToAppUnits (nscoord aAppUnitsPerPixel) const;
     441                 :   nsIntRect GetLargestRectangle (const nsIntRect& aContainingRect = nsIntRect()) const
     442                 :   {
     443                 :     return FromRect (mImpl.GetLargestRectangle( ToRect(aContainingRect) ));
     444                 :   }
     445                 : 
     446                 :   nsIntRegion& ScaleRoundOut (float aXScale, float aYScale)
     447                 :   {
     448                 :     mImpl.ScaleRoundOut(aXScale, aYScale);
     449                 :     return *this;
     450                 :   }
     451                 : 
     452                 :   /**
     453                 :    * Make sure the region has at most aMaxRects by adding area to it
     454                 :    * if necessary. The simplified region will be a superset of the
     455                 :    * original region. The simplified region's bounding box will be
     456                 :    * the same as for the current region.
     457                 :    */
     458                 :   void SimplifyOutward (PRUint32 aMaxRects)
     459                 :   {
     460                 :     mImpl.SimplifyOutward (aMaxRects);
     461                 :   }
     462                 :   /**
     463                 :    * Make sure the region has at most aMaxRects by removing area from
     464                 :    * it if necessary. The simplified region will be a subset of the
     465                 :    * original region.
     466                 :    */
     467                 :   void SimplifyInward (PRUint32 aMaxRects)
     468                 :   {
     469                 :     mImpl.SimplifyInward (aMaxRects);
     470                 :   }
     471                 :   /**
     472                 :    * Efficiently try to remove a rectangle from this region. The actual
     473                 :    * area removed could be some sub-area contained by the rectangle
     474                 :    * (even possibly nothing at all).
     475                 :    * 
     476                 :    * We remove all rectangles that are contained by aRect.
     477                 :    */
     478                 :   void SimpleSubtract (const nsIntRect& aRect)
     479                 :   {
     480                 :     mImpl.SimpleSubtract (ToRect (aRect));
     481                 :   }
     482                 :   /**
     483                 :    * Efficiently try to remove a region from this region. The actual
     484                 :    * area removed could be some sub-area contained by aRegion
     485                 :    * (even possibly nothing at all).
     486                 :    * 
     487                 :    * We remove all rectangles of this region that are contained by
     488                 :    * a rectangle of aRegion.
     489                 :    */
     490                 :   void SimpleSubtract (const nsIntRegion& aRegion)
     491                 :   {
     492                 :     mImpl.SimpleSubtract (aRegion.mImpl);
     493                 :   }
     494                 : 
     495                 : private:
     496                 :   nsRegion mImpl;
     497                 : 
     498               2 :   static nsRect ToRect(const nsIntRect& aRect)
     499                 :   {
     500               2 :     return nsRect (aRect.x, aRect.y, aRect.width, aRect.height);
     501                 :   }
     502               3 :   static nsIntRect FromRect(const nsRect& aRect)
     503                 :   {
     504               3 :     return nsIntRect (aRect.x, aRect.y, aRect.width, aRect.height);
     505                 :   }
     506                 : };
     507                 : 
     508                 : class NS_GFX nsIntRegionRectIterator
     509                 : {
     510                 :   nsRegionRectIterator mImpl;
     511                 :   nsIntRect mTmp;
     512                 : 
     513                 : public:
     514               2 :   nsIntRegionRectIterator (const nsIntRegion& aRegion) : mImpl (aRegion.mImpl) {}
     515                 : 
     516               5 :   const nsIntRect* Next ()
     517                 :   {
     518               5 :     const nsRect* r = mImpl.Next();
     519               5 :     if (!r)
     520               2 :       return nsnull;
     521               3 :     mTmp = nsIntRegion::FromRect (*r);
     522               3 :     return &mTmp;
     523                 :   }
     524                 : 
     525                 :   const nsIntRect* Prev ()
     526                 :   {
     527                 :     const nsRect* r = mImpl.Prev();
     528                 :     if (!r)
     529                 :       return nsnull;
     530                 :     mTmp = nsIntRegion::FromRect (*r);
     531                 :     return &mTmp;
     532                 :   }
     533                 : 
     534                 :   void Reset ()
     535                 :   {
     536                 :     mImpl.Reset ();
     537                 :   }
     538                 : };
     539                 : 
     540                 : #endif

Generated by: LCOV version 1.7