LCOV - code coverage report
Current view: directory - gfx/layers - ReadbackProcessor.h (source / functions) Found Hit Coverage
Test: app.info Lines: 2 0 0.0 %
Date: 2012-06-02 Functions: 3 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                 :  *   Robert O'Callahan <robert@ocallahan.org>
      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 GFX_READBACKPROCESSOR_H
      39                 : #define GFX_READBACKPROCESSOR_H
      40                 : 
      41                 : #include "ReadbackLayer.h"
      42                 : #include "ThebesLayerBuffer.h"
      43                 : #include "nsTArray.h"
      44                 : 
      45                 : namespace mozilla {
      46                 : namespace layers {
      47                 : 
      48               0 : class ReadbackProcessor {
      49                 : public:
      50                 :   /**
      51                 :    * Called by the container before processing any child layers. Call this
      52                 :    * if any child layer might have changed in any way (other than content-only
      53                 :    * changes to layers other than ColorLayers and ThebesLayers).
      54                 :    *
      55                 :    * This method recomputes the relationship between ReadbackLayers and
      56                 :    * sibling layers, and dispatches changes to ReadbackLayers. Except that
      57                 :    * if a ThebesLayer needs its contents sent to some ReadbackLayer, we'll
      58                 :    * just record that internally and later the ThebesLayer should call
      59                 :    * GetThebesLayerUpdates when it paints, to find out which rectangle needs
      60                 :    * to be sent, and the ReadbackLayer it needs to be sent to.
      61                 :    */
      62                 :   void BuildUpdates(ContainerLayer* aContainer);
      63                 : 
      64               0 :   struct Update {
      65                 :     /**
      66                 :      * The layer a ThebesLayer should send its contents to.
      67                 :      */
      68                 :     ReadbackLayer* mLayer;
      69                 :     /**
      70                 :      * The rectangle of content that it should send, in the ThebesLayer's
      71                 :      * coordinate system. This rectangle is guaranteed to be in the ThebesLayer's
      72                 :      * visible region. Translate it to mLayer's coordinate system
      73                 :      * by adding mLayer->GetBackgroundLayerOffset().
      74                 :      */
      75                 :     nsIntRect      mUpdateRect;
      76                 :     /**
      77                 :      * The sequence counter value to use when calling DoUpdate
      78                 :      */
      79                 :     PRUint64       mSequenceCounter;
      80                 :   };
      81                 :   /**
      82                 :    * Appends any ReadbackLayers that need to be updated, and the rects that
      83                 :    * need to be updated, to aUpdates. Only need to call this for ThebesLayers
      84                 :    * that have been marked UsedForReadback().
      85                 :    * Each Update's mLayer's mBackgroundLayer will have been set to aLayer.
      86                 :    * If a ThebesLayer doesn't call GetThebesLayerUpdates, then all the
      87                 :    * ReadbackLayers that needed data from that ThebesLayer will be marked
      88                 :    * as having unknown backgrounds.
      89                 :    * @param aUpdateRegion if non-null, this region is set to the union
      90                 :    * of the mUpdateRects.
      91                 :    */
      92                 :   void GetThebesLayerUpdates(ThebesLayer* aLayer,
      93                 :                              nsTArray<Update>* aUpdates,
      94                 :                              nsIntRegion* aUpdateRegion = nsnull);
      95                 : 
      96                 :   ~ReadbackProcessor();
      97                 : 
      98                 : protected:
      99                 :   void BuildUpdatesForLayer(ReadbackLayer* aLayer);
     100                 : 
     101                 :   nsTArray<Update> mAllUpdates;
     102                 : };
     103                 : 
     104                 : }
     105                 : }
     106                 : #endif /* GFX_READBACKPROCESSOR_H */

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