LCOV - code coverage report
Current view: directory - gfx/thebes - gfxCachedTempSurface.cpp (source / functions) Found Hit Coverage
Test: app.info Lines: 51 0 0.0 %
Date: 2012-06-02 Functions: 7 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) 2009
      19                 :  * the Initial Developer. All Rights Reserved.
      20                 :  *
      21                 :  * Contributor(s):
      22                 :  *   Karl Tomlinson <karlt+@karlt.net>
      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                 : #include "gfxCachedTempSurface.h"
      39                 : #include "gfxContext.h"
      40                 : 
      41                 : class CachedSurfaceExpirationTracker :
      42                 :   public nsExpirationTracker<gfxCachedTempSurface,2> {
      43                 : 
      44                 : public:
      45                 :   // With K = 2, this means that surfaces will be released when they are not
      46                 :   // used for 1-2 seconds.
      47                 :   enum { TIMEOUT_MS = 1000 };
      48               0 :   CachedSurfaceExpirationTracker()
      49               0 :     : nsExpirationTracker<gfxCachedTempSurface,2>(TIMEOUT_MS) {}
      50                 : 
      51               0 :   ~CachedSurfaceExpirationTracker() {
      52               0 :     AgeAllGenerations();
      53               0 :   }
      54                 : 
      55               0 :   virtual void NotifyExpired(gfxCachedTempSurface* aSurface) {
      56               0 :     RemoveObject(aSurface);
      57               0 :     aSurface->Expire();
      58               0 :   }
      59                 : 
      60               0 :   static void MarkSurfaceUsed(gfxCachedTempSurface* aSurface)
      61                 :   {
      62               0 :     if (aSurface->GetExpirationState()->IsTracked()) {
      63               0 :       sExpirationTracker->MarkUsed(aSurface);
      64               0 :       return;
      65                 :     }
      66                 : 
      67               0 :     if (!sExpirationTracker) {
      68               0 :       sExpirationTracker = new CachedSurfaceExpirationTracker();
      69                 :     }
      70               0 :     sExpirationTracker->AddObject(aSurface);
      71                 :   }
      72                 : 
      73               0 :   static void RemoveSurface(gfxCachedTempSurface* aSurface)
      74                 :   {
      75               0 :     if (!sExpirationTracker)
      76               0 :       return;
      77                 : 
      78               0 :     if (aSurface->GetExpirationState()->IsTracked()) {
      79               0 :       sExpirationTracker->RemoveObject(aSurface);
      80                 :     }
      81               0 :     if (sExpirationTracker->IsEmpty()) {
      82               0 :       delete sExpirationTracker;
      83               0 :       sExpirationTracker = nsnull;
      84                 :     }
      85                 :   }
      86                 : 
      87                 : private:
      88                 :   static CachedSurfaceExpirationTracker* sExpirationTracker;
      89                 : };
      90                 : 
      91                 : CachedSurfaceExpirationTracker*
      92                 : CachedSurfaceExpirationTracker::sExpirationTracker = nsnull;
      93                 : 
      94               0 : gfxCachedTempSurface::~gfxCachedTempSurface()
      95                 : {
      96               0 :   CachedSurfaceExpirationTracker::RemoveSurface(this);
      97               0 : }
      98                 : 
      99                 : already_AddRefed<gfxContext>
     100               0 : gfxCachedTempSurface::Get(gfxASurface::gfxContentType aContentType,
     101                 :                           const gfxRect& aRect,
     102                 :                           gfxASurface* aSimilarTo)
     103                 : {
     104               0 :   if (mSurface) {
     105                 :     /* Verify the current buffer is valid for this purpose */
     106               0 :     if (mSize.width < aRect.width || mSize.height < aRect.height
     107               0 :         || mSurface->GetContentType() != aContentType) {
     108               0 :       mSurface = nsnull;
     109                 :     } else {
     110               0 :       NS_ASSERTION(mType == aSimilarTo->GetType(),
     111                 :                    "Unexpected surface type change");
     112                 :     }
     113                 :   }
     114                 : 
     115               0 :   bool cleared = false;
     116               0 :   if (!mSurface) {
     117               0 :     mSize = gfxIntSize(PRInt32(ceil(aRect.width)), PRInt32(ceil(aRect.height)));
     118               0 :     mSurface = aSimilarTo->CreateSimilarSurface(aContentType, mSize);
     119               0 :     if (!mSurface)
     120               0 :       return nsnull;
     121                 : 
     122               0 :     cleared = true;
     123                 : #ifdef DEBUG
     124               0 :     mType = aSimilarTo->GetType();
     125                 : #endif
     126                 :   }
     127               0 :   mSurface->SetDeviceOffset(-aRect.TopLeft());
     128                 : 
     129               0 :   nsRefPtr<gfxContext> ctx = new gfxContext(mSurface);
     130               0 :   ctx->Rectangle(aRect);
     131               0 :   ctx->Clip();
     132               0 :   if (!cleared && aContentType != gfxASurface::CONTENT_COLOR) {
     133               0 :     ctx->SetOperator(gfxContext::OPERATOR_CLEAR);
     134               0 :     ctx->Paint();
     135               0 :     ctx->SetOperator(gfxContext::OPERATOR_OVER);
     136                 :   }
     137                 : 
     138               0 :   CachedSurfaceExpirationTracker::MarkSurfaceUsed(this);
     139                 : 
     140               0 :   return ctx.forget();
     141                 : }

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