canvas/source/vcl/bitmapbackbuffer.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20
  21 #include "bitmapbackbuffer.hxx"
  22
  23 #include <osl/mutex.hxx>
  24
  25 #include <vcl/svapp.hxx>
  26 #include <vcl/bitmapex.hxx>
  27 #include <vcl/bmpacc.hxx>
  28
  29
  30 namespace vclcanvas
  31 {
  32     BitmapBackBuffer::BitmapBackBuffer( const BitmapEx&         rBitmap,
  33                                         const OutputDevice&     rRefDevice ) :
  34         maBitmap( rBitmap ),
  35         mpVDev( NULL ),
  36         mrRefDevice( rRefDevice ),
  37         mbBitmapContentIsCurrent( false ),
  38         mbVDevContentIsCurrent( false )
  39     {
  40     }
  41
  42     BitmapBackBuffer::~BitmapBackBuffer()
  43     {
  44         // make sure solar mutex is held on deletion (other methods
  45         // are supposed to be called with already locked solar mutex)
  46         SolarMutexGuard aGuard;
  47
  48         if( mpVDev )
  49             delete mpVDev;
  50     }
  51
  52     OutputDevice& BitmapBackBuffer::getOutDev()
  53     {
  54         createVDev();
  55         updateVDev();
  56         return *mpVDev;
  57     }
  58
  59     const OutputDevice& BitmapBackBuffer::getOutDev() const
  60     {
  61         createVDev();
  62         updateVDev();
  63         return *mpVDev;
  64     }
  65
  66     void BitmapBackBuffer::clear()
  67     {
  68         // force current content to bitmap, make all transparent white
  69         getBitmapReference().Erase(COL_TRANSPARENT);
  70     }
  71
  72     BitmapEx& BitmapBackBuffer::getBitmapReference()
  73     {
  74         OSL_ENSURE( !mbBitmapContentIsCurrent || !mbVDevContentIsCurrent,
  75                     "BitmapBackBuffer::getBitmapReference(): Both bitmap and VDev are valid?!" );
  76
  77         if( mbVDevContentIsCurrent && mpVDev )
  78         {
  79             // VDev content is more current than bitmap - copy contents before!
  80             mpVDev->EnableMapMode( sal_False );
  81             const Point aEmptyPoint;
  82             *maBitmap = mpVDev->GetBitmapEx( aEmptyPoint,
  83                                              mpVDev->GetOutputSizePixel() );
  84         }
  85
  86         // client queries bitmap, and will possibly alter content -
  87         // next time, VDev needs to be updated
  88         mbBitmapContentIsCurrent = true;
  89         mbVDevContentIsCurrent   = false;
  90
  91         return *maBitmap;
  92     }
  93
  94     Size BitmapBackBuffer::getBitmapSizePixel() const
  95     {
  96         Size aSize = maBitmap->GetSizePixel();
  97
  98         if( mbVDevContentIsCurrent && mpVDev )
  99         {
 100             mpVDev->EnableMapMode( sal_False );
 101             aSize = mpVDev->GetOutputSizePixel();
 102         }
 103
 104         return aSize;
 105     }
 106
 107     void BitmapBackBuffer::createVDev() const
 108     {
 109         if( !mpVDev )
 110         {
 111             // VDev not yet created, do it now. Create an alpha-VDev,
 112             // if bitmap has transparency.
 113             mpVDev = maBitmap->IsTransparent() ?
 114                 new VirtualDevice( mrRefDevice, 0, 0 ) :
 115                 new VirtualDevice( mrRefDevice );
 116
 117             OSL_ENSURE( mpVDev,
 118                         "BitmapBackBuffer::createVDev(): Unable to create VirtualDevice" );
 119
 120             mpVDev->SetOutputSizePixel( maBitmap->GetSizePixel() );
 121
 122             // #i95645#
 123 #if defined( MACOSX )
 124             // use AA on VCLCanvas for Mac
 125             mpVDev->SetAntialiasing( ANTIALIASING_ENABLE_B2DDRAW | mpVDev->GetAntialiasing() );
 126 #else
 127             // switch off AA for WIN32 and UNIX, the VCLCanvas does not look good with it and
 128             // is not required to do AA. It would need to be adapted to use it correctly
 129             // (especially gradient painting). This will need extra work.
 130             mpVDev->SetAntialiasing(mpVDev->GetAntialiasing() & ~ANTIALIASING_ENABLE_B2DDRAW);
 131 #endif
 132         }
 133     }
 134
 135     void BitmapBackBuffer::updateVDev() const
 136     {
 137         OSL_ENSURE( !mbBitmapContentIsCurrent || !mbVDevContentIsCurrent,
 138                     "BitmapBackBuffer::updateVDev(): Both bitmap and VDev are valid?!" );
 139
 140         if( mpVDev && mbBitmapContentIsCurrent )
 141         {
 142             // fill with bitmap content
 143             mpVDev->EnableMapMode( sal_False );
 144             const Point aEmptyPoint;
 145             mpVDev->DrawBitmapEx( aEmptyPoint, *maBitmap );
 146         }
 147
 148         // canvas queried the VDev, and will possibly paint into
 149         // it. Next time, bitmap must be updated
 150         mbBitmapContentIsCurrent = false;
 151         mbVDevContentIsCurrent   = true;
 152     }
 153 }
 154
 155 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */