224 lines
8.6 KiB
C++
224 lines
8.6 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* This file incorporates work covered by the following license notice:
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed
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* with this work for additional information regarding copyright
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* ownership. The ASF licenses this file to you under the Apache
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* License, Version 2.0 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.apache.org/licenses/LICENSE-2.0 .
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*/
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#include <canvas/debug.hxx>
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#include <canvas/canvastools.hxx>
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#include <cppuhelper/supportsservice.hxx>
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#include <tools/diagnose_ex.h>
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#include "cairo_canvasbitmap.hxx"
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#include <vcl/bmpacc.hxx>
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#include <vcl/bitmapex.hxx>
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using namespace ::cairo;
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using namespace ::com::sun::star;
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namespace cairocanvas
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{
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CanvasBitmap::CanvasBitmap( const ::basegfx::B2ISize& rSize,
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const SurfaceProviderRef& rSurfaceProvider,
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rendering::XGraphicDevice* pDevice,
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bool bHasAlpha ) :
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mpSurfaceProvider( rSurfaceProvider ),
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mpBufferSurface(),
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mpBufferCairo(),
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maSize(rSize),
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mbHasAlpha(bHasAlpha)
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{
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ENSURE_OR_THROW( mpSurfaceProvider.is(),
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"CanvasBitmap::CanvasBitmap(): Invalid surface or device" );
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SAL_INFO(
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"canvas.cairo",
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"bitmap size: " << rSize.getX() << "x" << rSize.getY());
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mpBufferSurface = mpSurfaceProvider->createSurface( rSize, bHasAlpha ? CAIRO_CONTENT_COLOR_ALPHA : CAIRO_CONTENT_COLOR );
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mpBufferCairo = mpBufferSurface->getCairo();
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maCanvasHelper.init( rSize, *mpSurfaceProvider, pDevice );
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maCanvasHelper.setSurface( mpBufferSurface, bHasAlpha );
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// clear bitmap to 100% transparent
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maCanvasHelper.clear();
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}
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void CanvasBitmap::disposeThis()
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{
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mpSurfaceProvider.clear();
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mpBufferCairo.reset();
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mpBufferSurface.reset();
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// forward to parent
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CanvasBitmap_Base::disposeThis();
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}
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SurfaceSharedPtr CanvasBitmap::getSurface()
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{
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return mpBufferSurface;
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}
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SurfaceSharedPtr CanvasBitmap::createSurface( const ::basegfx::B2ISize& rSize, int aContent )
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{
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return mpSurfaceProvider->createSurface(rSize,aContent);
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}
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SurfaceSharedPtr CanvasBitmap::createSurface( ::Bitmap& rBitmap )
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{
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return mpSurfaceProvider->createSurface(rBitmap);
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}
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SurfaceSharedPtr CanvasBitmap::changeSurface( bool, bool )
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{
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// non-modifiable surface here
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return SurfaceSharedPtr();
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}
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OutputDevice* CanvasBitmap::getOutputDevice()
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{
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return mpSurfaceProvider->getOutputDevice();
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}
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bool CanvasBitmap::repaint( const SurfaceSharedPtr& pSurface,
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const rendering::ViewState& viewState,
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const rendering::RenderState& renderState )
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{
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return maCanvasHelper.repaint( pSurface, viewState, renderState );
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}
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uno::Any SAL_CALL CanvasBitmap::getFastPropertyValue( sal_Int32 nHandle ) throw (uno::RuntimeException, std::exception)
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{
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uno::Any aRV( sal_Int32(0) );
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// 0 ... get BitmapEx
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// 1 ... get Pixbuf with bitmap RGB content
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// 2 ... get Pixbuf with bitmap alpha mask
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switch( nHandle )
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{
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case 0:
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{
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aRV = uno::Any( reinterpret_cast<sal_Int64>( nullptr ) );
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if ( !mbHasAlpha )
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break;
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::Size aSize( maSize.getX(), maSize.getY() );
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// FIXME: if we could teach VCL/ about cairo handles, life could
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// be significantly better here perhaps.
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cairo_surface_t *pPixels;
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pPixels = cairo_image_surface_create( CAIRO_FORMAT_ARGB32,
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aSize.Width(), aSize.Height() );
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cairo_t *pCairo = cairo_create( pPixels );
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if( !pPixels || !pCairo || cairo_status(pCairo) != CAIRO_STATUS_SUCCESS )
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break;
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// suck ourselves from the X server to this buffer so then we can fiddle with
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// Alpha to turn it into the ultra-lame vcl required format and then push it
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// all back again later at vast expense [ urgh ]
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cairo_set_source_surface( pCairo, getSurface()->getCairoSurface().get(), 0, 0 );
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cairo_set_operator( pCairo, CAIRO_OPERATOR_SOURCE );
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cairo_paint( pCairo );
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::Bitmap aRGB( aSize, 24 );
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::AlphaMask aMask( aSize );
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BitmapWriteAccess *pRGBWrite( aRGB.AcquireWriteAccess() );
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if( pRGBWrite )
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{
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BitmapWriteAccess *pMaskWrite( aMask.AcquireWriteAccess() );
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if( pMaskWrite )
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{
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cairo_surface_flush(pPixels);
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unsigned char *pSrc = cairo_image_surface_get_data( pPixels );
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unsigned int nStride = cairo_image_surface_get_stride( pPixels );
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for( unsigned long y = 0; y < (unsigned long) aSize.Height(); y++ )
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{
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sal_uInt32 *pPix = reinterpret_cast<sal_uInt32 *>(pSrc + nStride * y);
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for( unsigned long x = 0; x < (unsigned long) aSize.Width(); x++ )
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{
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sal_uInt8 nAlpha = (*pPix >> 24);
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sal_uInt8 nR = (*pPix >> 16) & 0xff;
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sal_uInt8 nG = (*pPix >> 8) & 0xff;
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sal_uInt8 nB = *pPix & 0xff;
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if( nAlpha != 0 && nAlpha != 255 )
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{
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// Cairo uses pre-multiplied alpha - we do not => re-multiply
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nR = (sal_uInt8) MinMax( ((sal_uInt32)nR * 255) / nAlpha, 0, 255 );
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nG = (sal_uInt8) MinMax( ((sal_uInt32)nG * 255) / nAlpha, 0, 255 );
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nB = (sal_uInt8) MinMax( ((sal_uInt32)nB * 255) / nAlpha, 0, 255 );
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}
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pRGBWrite->SetPixel( y, x, BitmapColor( nR, nG, nB ) );
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pMaskWrite->SetPixelIndex( y, x, 255 - nAlpha );
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pPix++;
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}
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}
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aMask.ReleaseAccess( pMaskWrite );
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}
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::Bitmap::ReleaseAccess( pRGBWrite );
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}
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// ignore potential errors above. will get caller a
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// uniformely white bitmap, but not that there would
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// be error handling in calling code ...
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::BitmapEx *pBitmapEx = new ::BitmapEx( aRGB, aMask );
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cairo_destroy( pCairo );
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cairo_surface_destroy( pPixels );
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aRV = uno::Any( reinterpret_cast<sal_Int64>( pBitmapEx ) );
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break;
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}
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case 1:
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{
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aRV = getOutputDevice()->GetNativeSurfaceHandle(mpBufferSurface, maSize);
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break;
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}
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case 2:
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{
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// Always return nothing - for the RGB surface support.
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// Alpha code paths go via the above case 0.
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aRV = uno::Any();
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break;
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}
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}
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return aRV;
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}
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OUString SAL_CALL CanvasBitmap::getImplementationName( ) throw (uno::RuntimeException, std::exception)
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{
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return OUString( "CairoCanvas.CanvasBitmap" );
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}
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sal_Bool SAL_CALL CanvasBitmap::supportsService( const OUString& ServiceName ) throw (uno::RuntimeException, std::exception)
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{
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return cppu::supportsService( this, ServiceName );
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}
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uno::Sequence< OUString > SAL_CALL CanvasBitmap::getSupportedServiceNames( ) throw (uno::RuntimeException, std::exception)
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{
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uno::Sequence< OUString > aRet(1);
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aRet[0] = "com.sun.star.rendering.CanvasBitmap";
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return aRet;
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}
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}
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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