xref: /aoo42x/main/vcl/source/gdi/bitmapex.cxx (revision cdf0e10c)

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 * Copyright 2000, 2010 Oracle and/or its affiliates.
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 * OpenOffice.org - a multi-platform office productivity suite
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * <http://www.openoffice.org/license.html>
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// MARKER(update_precomp.py): autogen include statement, do not remove
#include "precompiled_vcl.hxx"

#include <ctype.h>

#include <rtl/crc.h>

#include <tools/stream.hxx>
#include <tools/debug.hxx>
#include <tools/rc.h>

#include <vcl/salbtype.hxx>
#include <vcl/outdev.hxx>
#include <vcl/alpha.hxx>
#include <vcl/bitmapex.hxx>
#include <vcl/pngread.hxx>
#include <vcl/svapp.hxx>
#include <vcl/bmpacc.hxx>

#include <image.h>
#include <impimagetree.hxx>

// ------------
// - BitmapEx -
// ------------

BitmapEx::BitmapEx() :
		eTransparent( TRANSPARENT_NONE ),
		bAlpha		( sal_False )
{
}

// ------------------------------------------------------------------

BitmapEx::BitmapEx( const BitmapEx& rBitmapEx ) :
		aBitmap				( rBitmapEx.aBitmap ),
		aMask				( rBitmapEx.aMask ),
		aBitmapSize			( rBitmapEx.aBitmapSize ),
		aTransparentColor	( rBitmapEx.aTransparentColor ),
		eTransparent		( rBitmapEx.eTransparent ),
		bAlpha				( rBitmapEx.bAlpha )
{
}

BitmapEx::BitmapEx( const BitmapEx& rBitmapEx, Point aSrc, Size aSize ) :
		eTransparent( TRANSPARENT_NONE ),
		bAlpha		( sal_False )
{
	if( rBitmapEx.IsEmpty() )
		return;

	aBitmap = Bitmap( aSize, rBitmapEx.aBitmap.GetBitCount() );
	aBitmapSize = aSize;
	if( rBitmapEx.IsAlpha() )
	{
		bAlpha = sal_True;
		aMask = AlphaMask( aSize ).ImplGetBitmap();
	}
	else if( rBitmapEx.IsTransparent() )
		aMask = Bitmap( aSize, rBitmapEx.aMask.GetBitCount() );

	Rectangle aDestRect( Point( 0, 0 ), aSize );
	Rectangle aSrcRect( aSrc, aSize );
	CopyPixel( aDestRect, aSrcRect, &rBitmapEx );
}

// ------------------------------------------------------------------

BitmapEx::BitmapEx( const ResId& rResId ) :
		eTransparent( TRANSPARENT_NONE ),
		bAlpha		( sal_False )
{
	static ImplImageTreeSingletonRef	aImageTree;
	ResMgr* 							pResMgr = NULL;

	ResMgr::GetResourceSkipHeader( rResId.SetRT( RSC_BITMAP ), &pResMgr );
	pResMgr->ReadLong();
	pResMgr->ReadLong();

	const String aFileName( pResMgr->ReadString() );
	::rtl::OUString aCurrentSymbolsStyle = Application::GetSettings().GetStyleSettings().GetCurrentSymbolsStyleName();

	if( !aImageTree->loadImage( aFileName, aCurrentSymbolsStyle, *this ) )
	{
#ifdef DBG_UTIL
		ByteString aErrorStr( "BitmapEx::BitmapEx( const ResId& rResId ): could not load image <" );
		DBG_ERROR( ( ( aErrorStr += ByteString( aFileName, RTL_TEXTENCODING_ASCII_US ) ) += '>' ).GetBuffer() );
#endif
	}
}

// ------------------------------------------------------------------

BitmapEx::BitmapEx( const Bitmap& rBmp ) :
		aBitmap		( rBmp ),
		aBitmapSize	( aBitmap.GetSizePixel() ),
		eTransparent( TRANSPARENT_NONE ),
		bAlpha		( sal_False )
{
}

// ------------------------------------------------------------------

BitmapEx::BitmapEx( const Bitmap& rBmp, const Bitmap& rMask ) :
		aBitmap			( rBmp ),
		aMask			( rMask ),
		aBitmapSize		( aBitmap.GetSizePixel() ),
		eTransparent	( !rMask ? TRANSPARENT_NONE : TRANSPARENT_BITMAP ),
		bAlpha			( sal_False )
{
    DBG_ASSERT( !rMask || rBmp.GetSizePixel() == rMask.GetSizePixel(),
                "BitmapEx::BitmapEx(): size mismatch for bitmap and mask." );

    // #105489# Ensure a mask is exactly one bit deep
    if( !!aMask && aMask.GetBitCount() != 1 )
    {
        OSL_TRACE("BitmapEx: forced mask to monochrome");
        aMask.ImplMakeMono( 255 );
    }
}

// ------------------------------------------------------------------

BitmapEx::BitmapEx( const Bitmap& rBmp, const AlphaMask& rAlphaMask ) :
		aBitmap			( rBmp ),
		aMask			( rAlphaMask.ImplGetBitmap() ),
		aBitmapSize		( aBitmap.GetSizePixel() ),
		eTransparent	( !rAlphaMask ? TRANSPARENT_NONE : TRANSPARENT_BITMAP ),
		bAlpha			( !rAlphaMask ? sal_False : sal_True )
{
    DBG_ASSERT( !rAlphaMask || rBmp.GetSizePixel() == rAlphaMask.GetSizePixel(),
                "BitmapEx::BitmapEx(): size mismatch for bitmap and alpha mask." );

    // #i75531# the workaround below can go when
    // X11SalGraphics::drawAlphaBitmap()'s render acceleration
    // can handle the bitmap depth mismatch directly
    if( aBitmap.GetBitCount() < aMask.GetBitCount() )
        aBitmap.Convert( BMP_CONVERSION_24BIT );
}

// ------------------------------------------------------------------

BitmapEx::BitmapEx( const Bitmap& rBmp, const Color& rTransparentColor ) :
		aBitmap				( rBmp ),
		aBitmapSize			( aBitmap.GetSizePixel() ),
		aTransparentColor	( rTransparentColor ),
		eTransparent		( TRANSPARENT_BITMAP ),
		bAlpha				( sal_False )
{
	aMask = aBitmap.CreateMask( aTransparentColor );

    DBG_ASSERT( rBmp.GetSizePixel() == aMask.GetSizePixel(),
                "BitmapEx::BitmapEx(): size mismatch for bitmap and alpha mask." );
}

// ------------------------------------------------------------------

BitmapEx::~BitmapEx()
{
}

// ------------------------------------------------------------------

// ------------------------------------------------------------------

BitmapEx& BitmapEx::operator=( const BitmapEx& rBitmapEx )
{
	if( &rBitmapEx != this )
	{
		aBitmap = rBitmapEx.aBitmap;
		aMask = rBitmapEx.aMask;
		aBitmapSize = rBitmapEx.aBitmapSize;
		aTransparentColor = rBitmapEx.aTransparentColor;
		eTransparent = rBitmapEx.eTransparent;
		bAlpha = rBitmapEx.bAlpha;
	}

	return *this;
}

// ------------------------------------------------------------------

sal_Bool BitmapEx::operator==( const BitmapEx& rBitmapEx ) const
{
	if( eTransparent != rBitmapEx.eTransparent )
		return sal_False;

	if( aBitmap != rBitmapEx.aBitmap )
		return sal_False;

	if( aBitmapSize != rBitmapEx.aBitmapSize )
		return sal_False;

	if( eTransparent == TRANSPARENT_NONE )
		return sal_True;

	if( eTransparent == TRANSPARENT_COLOR )
		return aTransparentColor == rBitmapEx.aTransparentColor;

	return( ( aMask == rBitmapEx.aMask ) && ( bAlpha == rBitmapEx.bAlpha ) );
}

// ------------------------------------------------------------------

sal_Bool BitmapEx::IsEqual( const BitmapEx& rBmpEx ) const
{
	return( rBmpEx.eTransparent == eTransparent &&
			rBmpEx.bAlpha == bAlpha &&
			rBmpEx.aBitmap.IsEqual( aBitmap ) &&
			rBmpEx.aMask.IsEqual( aMask ) );
}

// ------------------------------------------------------------------

sal_Bool BitmapEx::IsEmpty() const
{
	return( aBitmap.IsEmpty() && aMask.IsEmpty() );
}

// ------------------------------------------------------------------

void BitmapEx::SetEmpty()
{
	aBitmap.SetEmpty();
	aMask.SetEmpty();
	eTransparent = TRANSPARENT_NONE;
	bAlpha = sal_False;
}

// ------------------------------------------------------------------

void BitmapEx::Clear()
{
	SetEmpty();
}

// ------------------------------------------------------------------

sal_Bool BitmapEx::IsTransparent() const
{
	return( eTransparent != TRANSPARENT_NONE );
}

// ------------------------------------------------------------------

sal_Bool BitmapEx::IsAlpha() const
{
	return( IsTransparent() && bAlpha );
}

// ------------------------------------------------------------------

Bitmap BitmapEx::GetBitmap( const Color* pTransReplaceColor ) const
{
	Bitmap aRetBmp( aBitmap );

	if( pTransReplaceColor && ( eTransparent != TRANSPARENT_NONE ) )
	{
		Bitmap aTempMask;

		if( eTransparent == TRANSPARENT_COLOR )
			aTempMask = aBitmap.CreateMask( aTransparentColor );
		else
			aTempMask = aMask;

		if( !IsAlpha() )
			aRetBmp.Replace( aTempMask, *pTransReplaceColor );
		else
			aRetBmp.Replace( GetAlpha(), *pTransReplaceColor );
	}

	return aRetBmp;
}

// ------------------------------------------------------------------

BitmapEx BitmapEx::GetColorTransformedBitmapEx( BmpColorMode eColorMode ) const
{
	BitmapEx aRet;

	if( BMP_COLOR_HIGHCONTRAST == eColorMode )
	{
		aRet = *this;
		aRet.aBitmap = aBitmap.GetColorTransformedBitmap( eColorMode );
	}
	else if( BMP_COLOR_MONOCHROME_BLACK == eColorMode ||
			 BMP_COLOR_MONOCHROME_WHITE == eColorMode )
	{
		aRet = *this;
		aRet.aBitmap = aRet.aBitmap.GetColorTransformedBitmap( eColorMode );

		if( !aRet.aMask.IsEmpty() )
		{
			aRet.aMask.CombineSimple( aRet.aBitmap, BMP_COMBINE_OR );
			aRet.aBitmap.Erase( ( BMP_COLOR_MONOCHROME_BLACK == eColorMode ) ? COL_BLACK : COL_WHITE );

            DBG_ASSERT( aRet.aBitmap.GetSizePixel() == aRet.aMask.GetSizePixel(),
                        "BitmapEx::GetColorTransformedBitmapEx(): size mismatch for bitmap and alpha mask." );
		}
	}

	return aRet;
}

// ------------------------------------------------------------------

Bitmap BitmapEx::GetMask() const
{
	Bitmap aRet( aMask );

	if( IsAlpha() )
		aRet.ImplMakeMono( 255 );

	return aRet;
}

// ------------------------------------------------------------------

AlphaMask BitmapEx::GetAlpha() const
{
	AlphaMask aAlpha;

	if( IsAlpha() )
		aAlpha.ImplSetBitmap( aMask );
	else
		aAlpha = aMask;

	return aAlpha;
}

// ------------------------------------------------------------------

sal_uLong BitmapEx::GetSizeBytes() const
{
	sal_uLong nSizeBytes = aBitmap.GetSizeBytes();

	if( eTransparent == TRANSPARENT_BITMAP )
		nSizeBytes += aMask.GetSizeBytes();

	return nSizeBytes;
}

// ------------------------------------------------------------------

sal_uLong BitmapEx::GetChecksum() const
{
	sal_uInt32	nCrc = aBitmap.GetChecksum();
	SVBT32		aBT32;

	UInt32ToSVBT32( (long) eTransparent, aBT32 );
	nCrc = rtl_crc32( nCrc, aBT32, 4 );

	UInt32ToSVBT32( (long) bAlpha, aBT32 );
	nCrc = rtl_crc32( nCrc, aBT32, 4 );

	if( ( TRANSPARENT_BITMAP == eTransparent ) && !aMask.IsEmpty() )
	{
		UInt32ToSVBT32( aMask.GetChecksum(), aBT32 );
		nCrc = rtl_crc32( nCrc, aBT32, 4 );
	}

	return nCrc;
}

// ------------------------------------------------------------------

void BitmapEx::SetSizePixel( const Size& rNewSize )
{
	Scale( rNewSize );
}

// ------------------------------------------------------------------

sal_Bool BitmapEx::Invert()
{
	sal_Bool bRet = sal_False;

	if( !!aBitmap )
	{
		bRet = aBitmap.Invert();

		if( bRet && ( eTransparent == TRANSPARENT_COLOR ) )
			aTransparentColor = BitmapColor( aTransparentColor ).Invert();
	}

	return bRet;
}

// ------------------------------------------------------------------

sal_Bool BitmapEx::Mirror( sal_uLong nMirrorFlags )
{
	sal_Bool bRet = sal_False;

	if( !!aBitmap )
	{
		bRet = aBitmap.Mirror( nMirrorFlags );

		if( bRet && ( eTransparent == TRANSPARENT_BITMAP ) && !!aMask )
			aMask.Mirror( nMirrorFlags );
	}

	return bRet;
}

// ------------------------------------------------------------------

sal_Bool BitmapEx::Scale( const double& rScaleX, const double& rScaleY, sal_uLong nScaleFlag )
{
	sal_Bool bRet = sal_False;

	if( !!aBitmap )
	{
		bRet = aBitmap.Scale( rScaleX, rScaleY, nScaleFlag );

		if( bRet && ( eTransparent == TRANSPARENT_BITMAP ) && !!aMask )
			aMask.Scale( rScaleX, rScaleY, BMP_SCALE_FAST );

		aBitmapSize = aBitmap.GetSizePixel();

        DBG_ASSERT( !aMask || aBitmap.GetSizePixel() == aMask.GetSizePixel(),
                    "BitmapEx::Scale(): size mismatch for bitmap and alpha mask." );
	}

	return bRet;
}

// ------------------------------------------------------------------------

sal_Bool BitmapEx::Scale( const Size& rNewSize, sal_uLong nScaleFlag )
{
	sal_Bool bRet;

	if( aBitmapSize.Width() && aBitmapSize.Height() )
	{
		bRet = Scale( (double) rNewSize.Width() / aBitmapSize.Width(),
					  (double) rNewSize.Height() / aBitmapSize.Height(),
					  nScaleFlag );
	}
	else
		bRet = sal_True;

	return bRet;
}

// ------------------------------------------------------------------

sal_Bool BitmapEx::Rotate( long nAngle10, const Color& rFillColor )
{
	sal_Bool bRet = sal_False;

	if( !!aBitmap )
	{
		const sal_Bool bTransRotate = ( Color( COL_TRANSPARENT ) == rFillColor );

		if( bTransRotate )
		{
			if( eTransparent == TRANSPARENT_COLOR )
				bRet = aBitmap.Rotate( nAngle10, aTransparentColor );
			else
			{
				bRet = aBitmap.Rotate( nAngle10, COL_BLACK );

				if( eTransparent == TRANSPARENT_NONE )
				{
					aMask = Bitmap( aBitmapSize, 1 );
					aMask.Erase( COL_BLACK );
					eTransparent = TRANSPARENT_BITMAP;
				}

				if( bRet && !!aMask )
					aMask.Rotate( nAngle10, COL_WHITE );
			}
		}
		else
		{
			bRet = aBitmap.Rotate( nAngle10, rFillColor );

			if( bRet && ( eTransparent == TRANSPARENT_BITMAP ) && !!aMask )
				aMask.Rotate( nAngle10, COL_WHITE );
		}

		aBitmapSize = aBitmap.GetSizePixel();

        DBG_ASSERT( !aMask || aBitmap.GetSizePixel() == aMask.GetSizePixel(),
                    "BitmapEx::Rotate(): size mismatch for bitmap and alpha mask." );
	}

	return bRet;
}

// ------------------------------------------------------------------

sal_Bool BitmapEx::Crop( const Rectangle& rRectPixel )
{
	sal_Bool bRet = sal_False;

	if( !!aBitmap )
	{
		bRet = aBitmap.Crop( rRectPixel );

		if( bRet && ( eTransparent == TRANSPARENT_BITMAP ) && !!aMask )
			aMask.Crop( rRectPixel );

		aBitmapSize = aBitmap.GetSizePixel();

        DBG_ASSERT( !aMask || aBitmap.GetSizePixel() == aMask.GetSizePixel(),
                    "BitmapEx::Crop(): size mismatch for bitmap and alpha mask." );
	}

	return bRet;
}

// ------------------------------------------------------------------

sal_Bool BitmapEx::Convert( BmpConversion eConversion )
{
	return( !!aBitmap ? aBitmap.Convert( eConversion ) : sal_False );
}

// ------------------------------------------------------------------

sal_Bool BitmapEx::ReduceColors( sal_uInt16 nNewColorCount, BmpReduce eReduce )
{
	return( !!aBitmap ? aBitmap.ReduceColors( nNewColorCount, eReduce ) : sal_False );
}

// ------------------------------------------------------------------

sal_Bool BitmapEx::Expand( sal_uLong nDX, sal_uLong nDY, const Color* pInitColor, sal_Bool bExpandTransparent )
{
	sal_Bool bRet = sal_False;

	if( !!aBitmap )
	{
		bRet = aBitmap.Expand( nDX, nDY, pInitColor );

		if( bRet && ( eTransparent == TRANSPARENT_BITMAP ) && !!aMask )
		{
			Color aColor( bExpandTransparent ? COL_WHITE : COL_BLACK );
			aMask.Expand( nDX, nDY, &aColor );
		}

		aBitmapSize = aBitmap.GetSizePixel();

        DBG_ASSERT( !aMask || aBitmap.GetSizePixel() == aMask.GetSizePixel(),
                    "BitmapEx::Expand(): size mismatch for bitmap and alpha mask." );
	}

	return bRet;
}

// ------------------------------------------------------------------

sal_Bool BitmapEx::CopyPixel( const Rectangle& rRectDst, const Rectangle& rRectSrc,
						  const BitmapEx* pBmpExSrc )
{
	sal_Bool bRet = sal_False;

	if( !pBmpExSrc || pBmpExSrc->IsEmpty() )
	{
		if( !aBitmap.IsEmpty() )
		{
			bRet = aBitmap.CopyPixel( rRectDst, rRectSrc );

			if( bRet && ( eTransparent == TRANSPARENT_BITMAP ) && !!aMask )
				aMask.CopyPixel( rRectDst, rRectSrc );
		}
	}
	else
	{
		if( !aBitmap.IsEmpty() )
		{
			bRet = aBitmap.CopyPixel( rRectDst, rRectSrc, &pBmpExSrc->aBitmap );

			if( bRet )
			{
				if( pBmpExSrc->IsAlpha() )
				{
					if( IsAlpha() )
                        // cast to use the optimized AlphaMask::CopyPixel
						((AlphaMask*) &aMask)->CopyPixel( rRectDst, rRectSrc, (AlphaMask*)&pBmpExSrc->aMask );
					else if( IsTransparent() )
					{
						AlphaMask* pAlpha = new AlphaMask( aMask );

						aMask = pAlpha->ImplGetBitmap();
						delete pAlpha;
						bAlpha = sal_True;
						aMask.CopyPixel( rRectDst, rRectSrc, &pBmpExSrc->aMask );
					}
					else
					{
						sal_uInt8	cBlack = 0;
						AlphaMask*	pAlpha = new AlphaMask( GetSizePixel(), &cBlack );

						aMask = pAlpha->ImplGetBitmap();
						delete pAlpha;
						eTransparent = TRANSPARENT_BITMAP;
						bAlpha = sal_True;
						aMask.CopyPixel( rRectDst, rRectSrc, &pBmpExSrc->aMask );
					}
				}
				else if( pBmpExSrc->IsTransparent() )
				{
					if( IsAlpha() )
					{
						AlphaMask aAlpha( pBmpExSrc->aMask );
						aMask.CopyPixel( rRectDst, rRectSrc, &aAlpha.ImplGetBitmap() );
					}
					else if( IsTransparent() )
						aMask.CopyPixel( rRectDst, rRectSrc, &pBmpExSrc->aMask );
					else
					{
						aMask = Bitmap( GetSizePixel(), 1 );
						aMask.Erase( Color( COL_BLACK ) );
						eTransparent = TRANSPARENT_BITMAP;
						aMask.CopyPixel( rRectDst, rRectSrc, &pBmpExSrc->aMask );
					}
				}
                else if( IsAlpha() )
                {
                    sal_uInt8	      cBlack = 0;
                    const AlphaMask   aAlphaSrc( pBmpExSrc->GetSizePixel(), &cBlack );

                    aMask.CopyPixel( rRectDst, rRectSrc, &aAlphaSrc.ImplGetBitmap() );
                }
                else if( IsTransparent() )
                {
                    Bitmap aMaskSrc( pBmpExSrc->GetSizePixel(), 1 );

                    aMaskSrc.Erase( Color( COL_BLACK ) );
                    aMask.CopyPixel( rRectDst, rRectSrc, &aMaskSrc );
                }
			}
		}
	}

	return bRet;
}

// ------------------------------------------------------------------

sal_Bool BitmapEx::Erase( const Color& rFillColor )
{
	sal_Bool bRet = sal_False;

	if( !!aBitmap )
	{
		bRet = aBitmap.Erase( rFillColor );

		if( bRet && ( eTransparent == TRANSPARENT_BITMAP ) && !!aMask )
		{
            // #104416# Respect transparency on fill color
            if( rFillColor.GetTransparency() )
            {
                const Color aFill( rFillColor.GetTransparency(), rFillColor.GetTransparency(), rFillColor.GetTransparency() );
                aMask.Erase( aFill );
            }
            else
            {
                const Color aBlack( COL_BLACK );
                aMask.Erase( aBlack );
            }
		}
	}

	return bRet;
}

// ------------------------------------------------------------------

sal_Bool BitmapEx::Dither( sal_uLong nDitherFlags )
{
	return( !!aBitmap ? aBitmap.Dither( nDitherFlags ) : sal_False );
}

// ------------------------------------------------------------------

sal_Bool BitmapEx::Replace( const Color& rSearchColor, const Color& rReplaceColor, sal_uLong nTol )
{
	return( !!aBitmap ? aBitmap.Replace( rSearchColor, rReplaceColor, nTol ) : sal_False );
}

// ------------------------------------------------------------------

sal_Bool BitmapEx::Replace( const Color* pSearchColors, const Color* pReplaceColors, sal_uLong nColorCount, const sal_uLong* pTols )
{
	return( !!aBitmap ? aBitmap.Replace( pSearchColors, pReplaceColors, nColorCount, (sal_uLong*) pTols ) : sal_False );
}

// ------------------------------------------------------------------

sal_Bool BitmapEx::Adjust( short nLuminancePercent, short nContrastPercent,
					   short nChannelRPercent, short nChannelGPercent, short nChannelBPercent,
					   double fGamma, sal_Bool bInvert )
{
	return( !!aBitmap ? aBitmap.Adjust( nLuminancePercent, nContrastPercent,
										nChannelRPercent, nChannelGPercent, nChannelBPercent,
										fGamma, bInvert ) : sal_False );
}

// ------------------------------------------------------------------

sal_Bool BitmapEx::Filter( BmpFilter eFilter, const BmpFilterParam* pFilterParam, const Link* pProgress )
{
	return( !!aBitmap ? aBitmap.Filter( eFilter, pFilterParam, pProgress ) : sal_False );
}

// ------------------------------------------------------------------

void BitmapEx::Draw( OutputDevice* pOutDev, const Point& rDestPt ) const
{
	pOutDev->DrawBitmapEx( rDestPt, *this );
}

// ------------------------------------------------------------------

void BitmapEx::Draw( OutputDevice* pOutDev,
					 const Point& rDestPt, const Size& rDestSize ) const
{
	pOutDev->DrawBitmapEx( rDestPt, rDestSize, *this );
}

// ------------------------------------------------------------------

void BitmapEx::Draw( OutputDevice* pOutDev,
					 const Point& rDestPt, const Size& rDestSize,
					 const Point& rSrcPtPixel, const Size& rSrcSizePixel ) const
{
	pOutDev->DrawBitmapEx( rDestPt, rDestSize, rSrcPtPixel, rSrcSizePixel, *this );
}

// ------------------------------------------------------------------

sal_uInt8 BitmapEx::GetTransparency(sal_Int32 nX, sal_Int32 nY) const
{
    sal_uInt8 nTransparency(0xff);

    if(!aBitmap.IsEmpty())
    {
        if(nX >= 0 && nX < aBitmapSize.Width() && nY >= 0 && nY < aBitmapSize.Height())
        {
            switch(eTransparent)
            {
                case TRANSPARENT_NONE:
                {
                    // not transparent, ergo all covered
                    nTransparency = 0x00;
                    break;
                }
                case TRANSPARENT_COLOR:
                {
                    Bitmap aTestBitmap(aBitmap);
                    BitmapReadAccess* pRead = aTestBitmap.AcquireReadAccess();

                    if(pRead)
                    {
                        const Color aColor = pRead->GetColor(nY, nX);

                        // if color is not equal to TransparentColor, we are not transparent
                        if(aColor != aTransparentColor)
                        {
                            nTransparency = 0x00;
                        }

                        aTestBitmap.ReleaseAccess(pRead);
                    }
                    break;
                }
                case TRANSPARENT_BITMAP:
                {
                    if(!aMask.IsEmpty())
                    {
                        Bitmap aTestBitmap(aMask);
                        BitmapReadAccess* pRead = aTestBitmap.AcquireReadAccess();

                        if(pRead)
                        {
                            const BitmapColor aBitmapColor(pRead->GetPixel(nY, nX));

                            if(bAlpha)
                            {
                                nTransparency = aBitmapColor.GetIndex();
                            }
                            else
                            {
                                if(0x00 == aBitmapColor.GetIndex())
                                {
                                    nTransparency = 0x00;
                                }
                            }

                            aTestBitmap.ReleaseAccess(pRead);
                        }
                    }
                    break;
                }
            }
        }
    }

    return nTransparency;
}

// ------------------------------------------------------------------

SvStream& operator<<( SvStream& rOStm, const BitmapEx& rBitmapEx )
{
	rBitmapEx.aBitmap.Write( rOStm );

	rOStm << (sal_uInt32) 0x25091962;
	rOStm << (sal_uInt32) 0xACB20201;
	rOStm << (sal_uInt8) rBitmapEx.eTransparent;

	if( rBitmapEx.eTransparent == TRANSPARENT_BITMAP )
		rBitmapEx.aMask.Write( rOStm );
	else if( rBitmapEx.eTransparent == TRANSPARENT_COLOR )
		rOStm << rBitmapEx.aTransparentColor;

	return rOStm;
}

// ------------------------------------------------------------------

SvStream& operator>>( SvStream& rIStm, BitmapEx& rBitmapEx )
{
	Bitmap aBmp;

	rIStm >> aBmp;

	if( !rIStm.GetError() )
	{
		const sal_uLong nStmPos = rIStm.Tell();
		sal_uInt32		nMagic1 = 0;
		sal_uInt32		nMagic2 = 0;

		rIStm >> nMagic1 >> nMagic2;

		if( ( nMagic1 != 0x25091962 ) || ( nMagic2 != 0xACB20201 ) || rIStm.GetError() )
		{
			rIStm.ResetError();
			rIStm.Seek( nStmPos );
			rBitmapEx = aBmp;
		}
		else
		{
			sal_uInt8 bTransparent = false;

			rIStm >> bTransparent;

			if( bTransparent == (sal_uInt8) TRANSPARENT_BITMAP )
			{
				Bitmap aMask;

				rIStm >> aMask;

				if( !!aMask)
				{
					// do we have an alpha mask?
					if( ( 8 == aMask.GetBitCount() ) && aMask.HasGreyPalette() )
					{
						AlphaMask aAlpha;

						// create alpha mask quickly (without greyscale conversion)
						aAlpha.ImplSetBitmap( aMask );
						rBitmapEx = BitmapEx( aBmp, aAlpha );
					}
					else
						rBitmapEx = BitmapEx( aBmp, aMask );
				}
				else
					rBitmapEx = aBmp;
			}
			else if( bTransparent == (sal_uInt8) TRANSPARENT_COLOR )
			{
				Color aTransparentColor;

				rIStm >> aTransparentColor;
				rBitmapEx = BitmapEx( aBmp, aTransparentColor );
			}
			else
				rBitmapEx = aBmp;
		}
	}

	return rIStm;
}