libreoffice/canvas/source/vcl/canvasbitmap.cxx

/*************************************************************************
 *
 *  OpenOffice.org - a multi-platform office productivity suite
 *
 *  $RCSfile: canvasbitmap.cxx,v $
 *
 *  $Revision: 1.6 $
 *
 *  last change: $Author: rt $ $Date: 2005-09-07 23:17:14 $
 *
 *  The Contents of this file are made available subject to
 *  the terms of GNU Lesser General Public License Version 2.1.
 *
 *
 *    GNU Lesser General Public License Version 2.1
 *    =============================================
 *    Copyright 2005 by Sun Microsystems, Inc.
 *    901 San Antonio Road, Palo Alto, CA 94303, USA
 *
 *    This library is free software; you can redistribute it and/or
 *    modify it under the terms of the GNU Lesser General Public
 *    License version 2.1, as published by the Free Software Foundation.
 *
 *    This library is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *    Lesser General Public License for more details.
 *
 *    You should have received a copy of the GNU Lesser General Public
 *    License along with this library; if not, write to the Free Software
 *    Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 *    MA  02111-1307  USA
 *
 ************************************************************************/

#include <canvas/debug.hxx>
#include "canvasbitmap.hxx"

#ifndef _SV_BITMAPEX_HXX
#include <vcl/bitmapex.hxx>
#endif
#ifndef _SV_BMPACC_HXX
#include <vcl/bmpacc.hxx>
#endif

using namespace ::com::sun::star;


namespace vclcanvas
{
    // Currently, the only way to generate an XBitmap is from
    // XGraphicDevice.getCompatibleBitmap(). Therefore, we don't even
    // take a bitmap here, but a VDev directly.
    CanvasBitmap::CanvasBitmap( const ::Size&                       rSize,
                                bool                                bAlphaBitmap,
                                const WindowGraphicDevice::ImplRef& rDevice )
    {
        ENSURE_AND_THROW( rDevice->getOutDev(),
                          "CanvasBitmap::CanvasBitmap(): Invalid reference outdev" );

        OutputDevice&            rOutDev( *rDevice->getOutDev() );
        tools::OutDevStateKeeper aStateKeeper( rOutDev );

        // create bitmap for given reference device
        // ========================================
        const USHORT nBitCount( (USHORT)24U );
        const BitmapPalette*    pPalette = NULL;

#if 0
        // TODO(P2): Seems like VCL doesn't handle palette bitmap with
        // alpha channel. Devise other ways to handle this, or fix VCL
        const USHORT nBitCount( ::std::min( (USHORT)24U,
                                            (USHORT)rOutDev.GetBitCount() ) );

        if( nBitCount <= 8 )
        {
            rOutDev.EnableMapMode( FALSE );

            // try to determine palette from output device (by
            // extracting a 1,1 bitmap, and querying it)
            const Point aEmptyPoint;
            const Size  aSize(1,1);
            Bitmap aTmpBitmap( rOutDev.GetBitmap( aEmptyPoint,
                                                  aSize ) );

            ScopedBitmapReadAccess pReadAccess( aTmpBitmap.AcquireReadAccess(),
                                                aTmpBitmap );

            pPalette = &pReadAccess->GetPalette();
        }
#endif

        Bitmap aBitmap( rSize, nBitCount, pPalette );

        // only create alpha channel bitmap, if factory requested
        // that. Providing alpha-channeled bitmaps by default has,
        // especially under VCL, a huge performance penalty (have to
        // use alpha VDev, then).
        if( bAlphaBitmap )
        {
            AlphaMask   aAlpha ( rSize );

            maCanvasHelper.setBitmap( BitmapEx( aBitmap, aAlpha ),
                                      rDevice );
        }
        else
        {
            maCanvasHelper.setBitmap( BitmapEx( aBitmap ),
                                      rDevice );
        }
    }

    CanvasBitmap::CanvasBitmap( const BitmapEx&                     rBitmap,
                                const WindowGraphicDevice::ImplRef& rDevice )
    {
        ENSURE_AND_THROW( rDevice->getOutDev(),
                          "CanvasBitmap::CanvasBitmap(): Invalid reference outdev" );

        maCanvasHelper.setBitmap( rBitmap,
                                  rDevice );
    }

    CanvasBitmap::~CanvasBitmap()
    {
    }

    void SAL_CALL CanvasBitmap::disposing()
    {
        tools::LocalGuard aGuard;

        // forward to parent
        CanvasBitmap_Base::disposing();
    }

#define SERVICE_NAME "com.sun.star.rendering.CanvasBitmap"

    ::rtl::OUString SAL_CALL CanvasBitmap::getImplementationName(  ) throw (uno::RuntimeException)
    {
        return ::rtl::OUString( RTL_CONSTASCII_USTRINGPARAM( CANVASBITMAP_IMPLEMENTATION_NAME ) );
    }

    sal_Bool SAL_CALL CanvasBitmap::supportsService( const ::rtl::OUString& ServiceName ) throw (uno::RuntimeException)
    {
        return ServiceName.equalsAsciiL( RTL_CONSTASCII_STRINGPARAM ( SERVICE_NAME ) );
    }

    uno::Sequence< ::rtl::OUString > SAL_CALL CanvasBitmap::getSupportedServiceNames(  ) throw (uno::RuntimeException)
    {
        uno::Sequence< ::rtl::OUString > aRet(1);
        aRet[0] = ::rtl::OUString( RTL_CONSTASCII_USTRINGPARAM ( SERVICE_NAME ) );

        return aRet;
    }

    BitmapEx CanvasBitmap::getBitmap() const
    {
        return maCanvasHelper.getBitmap();
    }

    bool CanvasBitmap::repaint( const GraphicObjectSharedPtr&   rGrf,
                                const ::Point&                  rPt,
                                const ::Size&                   rSz,
                                const GraphicAttr&              rAttr ) const
    {
        tools::LocalGuard aGuard;

        mbSurfaceDirty = true;

        return maCanvasHelper.repaint( rGrf, rPt, rSz, rAttr );
    }
}