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See the 18 * GNU Lesser General Public License version 3 for more details 19 * (a copy is included in the LICENSE file that accompanied this code). 20 * 21 * You should have received a copy of the GNU Lesser General Public License 22 * version 3 along with OpenOffice.org. If not, see 23 * <http://www.openoffice.org/license.html> 24 * for a copy of the LGPLv3 License. 25 * 26 ************************************************************************/ 27 28 // MARKER(update_precomp.py): autogen include statement, do not remove 29 #include "precompiled_canvas.hxx" 30 31 #include "bitmapbackbuffer.hxx" 32 33 #include <osl/mutex.hxx> 34 #include <vos/mutex.hxx> 35 36 #include <vcl/svapp.hxx> 37 #include <vcl/bitmapex.hxx> 38 #include <vcl/bmpacc.hxx> 39 40 41 namespace vclcanvas 42 { 43 BitmapBackBuffer::BitmapBackBuffer( const BitmapEx& rBitmap, 44 const OutputDevice& rRefDevice ) : 45 maBitmap( rBitmap ), 46 mpVDev( NULL ), 47 mrRefDevice( rRefDevice ), 48 mbBitmapContentIsCurrent( false ), 49 mbVDevContentIsCurrent( false ) 50 { 51 } 52 53 BitmapBackBuffer::~BitmapBackBuffer() 54 { 55 // make sure solar mutex is held on deletion (other methods 56 // are supposed to be called with already locked solar mutex) 57 ::vos::OGuard aGuard( Application::GetSolarMutex() ); 58 59 if( mpVDev ) 60 delete mpVDev; 61 } 62 63 OutputDevice& BitmapBackBuffer::getOutDev() 64 { 65 createVDev(); 66 updateVDev(); 67 return *mpVDev; 68 } 69 70 const OutputDevice& BitmapBackBuffer::getOutDev() const 71 { 72 createVDev(); 73 updateVDev(); 74 return *mpVDev; 75 } 76 77 void BitmapBackBuffer::clear() 78 { 79 // force current content to bitmap, make all transparent white 80 getBitmapReference().Erase(COL_TRANSPARENT); 81 } 82 83 BitmapEx& BitmapBackBuffer::getBitmapReference() 84 { 85 OSL_ENSURE( !mbBitmapContentIsCurrent || !mbVDevContentIsCurrent, 86 "BitmapBackBuffer::getBitmapReference(): Both bitmap and VDev are valid?!" ); 87 88 if( mbVDevContentIsCurrent && mpVDev ) 89 { 90 // VDev content is more current than bitmap - copy contents before! 91 mpVDev->EnableMapMode( sal_False ); 92 const Point aEmptyPoint; 93 *maBitmap = mpVDev->GetBitmapEx( aEmptyPoint, 94 mpVDev->GetOutputSizePixel() ); 95 } 96 97 // client queries bitmap, and will possibly alter content - 98 // next time, VDev needs to be updated 99 mbBitmapContentIsCurrent = true; 100 mbVDevContentIsCurrent = false; 101 102 return *maBitmap; 103 } 104 105 Size BitmapBackBuffer::getBitmapSizePixel() const 106 { 107 Size aSize = maBitmap->GetSizePixel(); 108 109 if( mbVDevContentIsCurrent && mpVDev ) 110 { 111 mpVDev->EnableMapMode( sal_False ); 112 aSize = mpVDev->GetOutputSizePixel(); 113 } 114 115 return aSize; 116 } 117 118 void BitmapBackBuffer::createVDev() const 119 { 120 if( !mpVDev ) 121 { 122 // VDev not yet created, do it now. Create an alpha-VDev, 123 // if bitmap has transparency. 124 mpVDev = maBitmap->IsTransparent() ? 125 new VirtualDevice( mrRefDevice, 0, 0 ) : 126 new VirtualDevice( mrRefDevice ); 127 128 OSL_ENSURE( mpVDev, 129 "BitmapBackBuffer::createVDev(): Unable to create VirtualDevice" ); 130 131 mpVDev->SetOutputSizePixel( maBitmap->GetSizePixel() ); 132 133 // #i95645# 134 #if defined( QUARTZ ) 135 // use AA on VCLCanvas for Mac 136 mpVDev->SetAntialiasing( ANTIALIASING_ENABLE_B2DDRAW | mpVDev->GetAntialiasing() ); 137 #else 138 // switch off AA for WIN32 and UNIX, the VCLCanvas does not look good with it and 139 // is not required to do AA. It would need to be adapted to use it correctly 140 // (especially gradient painting). This will need extra work. 141 mpVDev->SetAntialiasing(mpVDev->GetAntialiasing() & ~ANTIALIASING_ENABLE_B2DDRAW); 142 #endif 143 } 144 } 145 146 void BitmapBackBuffer::updateVDev() const 147 { 148 OSL_ENSURE( !mbBitmapContentIsCurrent || !mbVDevContentIsCurrent, 149 "BitmapBackBuffer::updateVDev(): Both bitmap and VDev are valid?!" ); 150 151 if( mpVDev && mbBitmapContentIsCurrent ) 152 { 153 // fill with bitmap content 154 mpVDev->EnableMapMode( sal_False ); 155 const Point aEmptyPoint; 156 mpVDev->DrawBitmapEx( aEmptyPoint, *maBitmap ); 157 } 158 159 // canvas queried the VDev, and will possibly paint into 160 // it. Next time, bitmap must be updated 161 mbBitmapContentIsCurrent = false; 162 mbVDevContentIsCurrent = true; 163 } 164 } 165 166