Adding upstream version 1:7.0.4.upstream/1%7.0.4upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 892 insertions, 0 deletions

diff --git a/vcl/source/bitmap/bitmap.cxx b/vcl/source/bitmap/bitmap.cxx
new file mode 100644
index 000000000..af5a6f440
--- /dev/null
+++ b/vcl/source/bitmap/bitmap.cxx
@@ -0,0 +1,892 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <osl/diagnose.h>
+#include <tools/helpers.hxx>
+#include <vcl/bitmap.hxx>
+#include <vcl/bitmapaccess.hxx>
+#include <vcl/outdev.hxx>
+
+#include <svdata.hxx>
+#include <salinst.hxx>
+#include <salbmp.hxx>
+#include <bitmapwriteaccess.hxx>
+
+#include <algorithm>
+#include <memory>
+
+Bitmap::Bitmap()
+{
+}
+
+Bitmap::Bitmap(const Bitmap& rBitmap)
+    : mxSalBmp(rBitmap.mxSalBmp)
+    , maPrefMapMode(rBitmap.maPrefMapMode)
+    , maPrefSize(rBitmap.maPrefSize)
+{
+}
+
+Bitmap::Bitmap(std::shared_ptr<SalBitmap> const & pSalBitmap)
+    : mxSalBmp(pSalBitmap)
+    , maPrefMapMode(MapMode(MapUnit::MapPixel))
+    , maPrefSize(mxSalBmp->GetSize())
+{
+}
+
+Bitmap::Bitmap( const Size& rSizePixel, sal_uInt16 nBitCount, const BitmapPalette* pPal )
+{
+    if (rSizePixel.Width() && rSizePixel.Height())
+    {
+        BitmapPalette   aPal;
+        BitmapPalette*  pRealPal = nullptr;
+
+        if( nBitCount <= 8 )
+        {
+            if( !pPal )
+            {
+                if( 1 == nBitCount )
+                {
+                    aPal.SetEntryCount( 2 );
+                    aPal[ 0 ] = COL_BLACK;
+                    aPal[ 1 ] = COL_WHITE;
+                }
+                else if( ( 4 == nBitCount ) || ( 8 == nBitCount ) )
+                {
+                    aPal.SetEntryCount( 1 << nBitCount );
+                    aPal[ 0 ] = COL_BLACK;
+                    aPal[ 1 ] = COL_BLUE;
+                    aPal[ 2 ] = COL_GREEN;
+                    aPal[ 3 ] = COL_CYAN;
+                    aPal[ 4 ] = COL_RED;
+                    aPal[ 5 ] = COL_MAGENTA;
+                    aPal[ 6 ] = COL_BROWN;
+                    aPal[ 7 ] = COL_GRAY;
+                    aPal[ 8 ] = COL_LIGHTGRAY;
+                    aPal[ 9 ] = COL_LIGHTBLUE;
+                    aPal[ 10 ] = COL_LIGHTGREEN;
+                    aPal[ 11 ] = COL_LIGHTCYAN;
+                    aPal[ 12 ] = COL_LIGHTRED;
+                    aPal[ 13 ] = COL_LIGHTMAGENTA;
+                    aPal[ 14 ] = COL_YELLOW;
+                    aPal[ 15 ] = COL_WHITE;
+
+                    // Create dither palette
+                    if( 8 == nBitCount )
+                    {
+                        sal_uInt16 nActCol = 16;
+
+                        for( sal_uInt16 nB = 0; nB < 256; nB += 51 )
+                            for( sal_uInt16 nG = 0; nG < 256; nG += 51 )
+                                for( sal_uInt16 nR = 0; nR < 256; nR += 51 )
+                                    aPal[ nActCol++ ] = BitmapColor( static_cast<sal_uInt8>(nR), static_cast<sal_uInt8>(nG), static_cast<sal_uInt8>(nB) );
+
+                        // Set standard Office colors
+                        aPal[ nActCol++ ] = BitmapColor( 0, 184, 255 );
+                    }
+                }
+            }
+            else
+                pRealPal = const_cast<BitmapPalette*>(pPal);
+        }
+
+        mxSalBmp = ImplGetSVData()->mpDefInst->CreateSalBitmap();
+        mxSalBmp->Create( rSizePixel, nBitCount, pRealPal ? *pRealPal : aPal );
+    }
+}
+
+Bitmap::~Bitmap()
+{
+}
+
+const BitmapPalette& Bitmap::GetGreyPalette( int nEntries )
+{
+    // Create greyscale palette with 2, 4, 16 or 256 entries
+    switch (nEntries)
+    {
+        case 2:
+        {
+            static const BitmapPalette aGreyPalette2 = [] {
+                BitmapPalette aPalette(2);
+                aPalette[0] = BitmapColor(0, 0, 0);
+                aPalette[1] = BitmapColor(255, 255, 255);
+                return aPalette;
+            }();
+
+            return aGreyPalette2;
+        }
+        case 4:
+        {
+            static const BitmapPalette aGreyPalette4 = [] {
+                BitmapPalette aPalette(4);
+                aPalette[0] = BitmapColor(0, 0, 0);
+                aPalette[1] = BitmapColor(85, 85, 85);
+                aPalette[2] = BitmapColor(170, 170, 170);
+                aPalette[3] = BitmapColor(255, 255, 255);
+                return aPalette;
+            }();
+
+            return aGreyPalette4;
+        }
+        case 16:
+        {
+            static const BitmapPalette aGreyPalette16 = [] {
+                sal_uInt8 cGrey = 0;
+                sal_uInt8 const cGreyInc = 17;
+
+                BitmapPalette aPalette(16);
+
+                for (sal_uInt16 i = 0; i < 16; ++i, cGrey += cGreyInc)
+                    aPalette[i] = BitmapColor(cGrey, cGrey, cGrey);
+
+                return aPalette;
+            }();
+
+            return aGreyPalette16;
+        }
+        case 256:
+        {
+            static const BitmapPalette aGreyPalette256 = [] {
+                BitmapPalette aPalette(256);
+
+                for (sal_uInt16 i = 0; i < 256; ++i)
+                    aPalette[i] = BitmapColor(static_cast<sal_uInt8>(i), static_cast<sal_uInt8>(i),
+                                              static_cast<sal_uInt8>(i));
+
+                return aPalette;
+            }();
+
+            return aGreyPalette256;
+        }
+    }
+    OSL_FAIL("Bitmap::GetGreyPalette: invalid entry count (2/4/16/256 allowed)");
+    return GetGreyPalette(2);
+}
+
+bool BitmapPalette::IsGreyPaletteAny() const
+{
+    const int nEntryCount = GetEntryCount();
+    if( !nEntryCount ) // NOTE: an empty palette means 1:1 mapping
+        return true;
+    // See above: only certain entry values will result in a valid call to GetGreyPalette
+    if( nEntryCount == 2 || nEntryCount == 4 || nEntryCount == 16 || nEntryCount == 256 )
+    {
+        const BitmapPalette& rGreyPalette = Bitmap::GetGreyPalette( nEntryCount );
+        if( rGreyPalette == *this )
+            return true;
+    }
+
+    bool bRet = false;
+    // TODO: is it worth to compare the entries for the general case?
+    if (nEntryCount == 2)
+    {
+       const BitmapColor& rCol0(maBitmapColor[0]);
+       const BitmapColor& rCol1(maBitmapColor[1]);
+       bRet = rCol0.GetRed() == rCol0.GetGreen() && rCol0.GetRed() == rCol0.GetBlue() &&
+              rCol1.GetRed() == rCol1.GetGreen() && rCol1.GetRed() == rCol1.GetBlue();
+    }
+    return bRet;
+}
+
+bool BitmapPalette::IsGreyPalette8Bit() const
+{
+    const int nEntryCount = GetEntryCount();
+    if( !nEntryCount ) // NOTE: an empty palette means 1:1 mapping
+        return true;
+    if( nEntryCount != 256 )
+        return false;
+    for (sal_uInt16 i = 0; i < 256; ++i)
+    {
+        if( maBitmapColor[i] != BitmapColor(i, i, i))
+            return false;
+    }
+    return true;
+}
+
+Bitmap& Bitmap::operator=( const Bitmap& rBitmap )
+{
+    if (this == &rBitmap)
+        return *this;
+
+    maPrefSize = rBitmap.maPrefSize;
+    maPrefMapMode = rBitmap.maPrefMapMode;
+    mxSalBmp = rBitmap.mxSalBmp;
+
+    return *this;
+}
+
+Bitmap& Bitmap::operator=( Bitmap&& rBitmap ) noexcept
+{
+    maPrefSize = std::move(rBitmap.maPrefSize);
+    maPrefMapMode = std::move(rBitmap.maPrefMapMode);
+    mxSalBmp = std::move(rBitmap.mxSalBmp);
+
+    return *this;
+}
+
+bool Bitmap::operator==( const Bitmap& rBmp ) const
+{
+    if (rBmp.mxSalBmp == mxSalBmp) // Includes both are nullptr
+        return true;
+    if (!rBmp.mxSalBmp || !mxSalBmp)
+        return false;
+    if (rBmp.mxSalBmp->GetSize() != mxSalBmp->GetSize() ||
+        rBmp.mxSalBmp->GetBitCount() != mxSalBmp->GetBitCount())
+        return false;
+    BitmapChecksum aChecksum1, aChecksum2;
+    rBmp.mxSalBmp->GetChecksum(aChecksum1);
+    mxSalBmp->GetChecksum(aChecksum2);
+    // If the bitmaps can't calculate a checksum, best to regard them as different.
+    if (aChecksum1 == 0 || aChecksum2 == 0)
+        return false;
+    return aChecksum1 == aChecksum2;
+}
+
+void Bitmap::SetEmpty()
+{
+    maPrefMapMode = MapMode();
+    maPrefSize = Size();
+    mxSalBmp.reset();
+}
+
+Size Bitmap::GetSizePixel() const
+{
+    return( mxSalBmp ? mxSalBmp->GetSize() : Size() );
+}
+
+sal_uInt16 Bitmap::GetBitCount() const
+{
+    if (!mxSalBmp)
+        return 0;
+
+    sal_uInt16 nBitCount = mxSalBmp->GetBitCount();
+    if (nBitCount <= 1)
+        return 1;
+    if (nBitCount <= 4)
+        return 4;
+    if (nBitCount <= 8)
+        return 8;
+    if (nBitCount <= 24)
+        return 24;
+    if (nBitCount <= 32)
+        return 32;
+    return 0;
+}
+
+bool Bitmap::HasGreyPaletteAny() const
+{
+    const sal_uInt16    nBitCount = GetBitCount();
+    bool            bRet = nBitCount == 1;
+
+    ScopedInfoAccess pIAcc(const_cast<Bitmap&>(*this));
+
+    if( pIAcc )
+    {
+        bRet = pIAcc->HasPalette() && pIAcc->GetPalette().IsGreyPaletteAny();
+    }
+
+    return bRet;
+}
+
+bool Bitmap::HasGreyPalette8Bit() const
+{
+    bool            bRet = false;
+    ScopedInfoAccess pIAcc(const_cast<Bitmap&>(*this));
+
+    if( pIAcc )
+    {
+        bRet = pIAcc->HasPalette() && pIAcc->GetPalette().IsGreyPalette8Bit();
+    }
+
+    return bRet;
+}
+
+BitmapChecksum Bitmap::GetChecksum() const
+{
+    BitmapChecksum nRet = 0;
+
+    if( mxSalBmp )
+    {
+        mxSalBmp->GetChecksum(nRet);
+
+        if (!nRet)
+        {
+            // nRet == 0 => probably, we were not able to acquire
+            // the buffer in SalBitmap::updateChecksum;
+            // so, we need to update the imp bitmap for this bitmap instance
+            // as we do in BitmapInfoAccess::ImplCreate
+            std::shared_ptr<SalBitmap> xNewImpBmp(ImplGetSVData()->mpDefInst->CreateSalBitmap());
+            if (xNewImpBmp->Create(*mxSalBmp, GetBitCount()))
+            {
+                Bitmap* pThis = const_cast<Bitmap*>(this);
+                pThis->mxSalBmp = xNewImpBmp;
+                mxSalBmp->GetChecksum(nRet);
+            }
+        }
+    }
+
+    return nRet;
+}
+
+void Bitmap::ImplMakeUnique()
+{
+    if (mxSalBmp && mxSalBmp.use_count() > 1)
+    {
+        std::shared_ptr<SalBitmap> xOldImpBmp = mxSalBmp;
+        mxSalBmp = ImplGetSVData()->mpDefInst->CreateSalBitmap();
+        (void)mxSalBmp->Create(*xOldImpBmp);
+    }
+}
+
+void Bitmap::ReassignWithSize(const Bitmap& rBitmap)
+{
+    const Size aOldSizePix(GetSizePixel());
+    const Size aNewSizePix(rBitmap.GetSizePixel());
+    const MapMode aOldMapMode(maPrefMapMode);
+    Size aNewPrefSize;
+
+    if ((aOldSizePix != aNewSizePix) && aOldSizePix.Width() && aOldSizePix.Height())
+    {
+        aNewPrefSize.setWidth(FRound(maPrefSize.Width() * aNewSizePix.Width() / aOldSizePix.Width()));
+        aNewPrefSize.setHeight(FRound(maPrefSize.Height() * aNewSizePix.Height() / aOldSizePix.Height()));
+    }
+    else
+    {
+        aNewPrefSize = maPrefSize;
+    }
+
+    *this = rBitmap;
+
+    maPrefSize = aNewPrefSize;
+    maPrefMapMode = aOldMapMode;
+}
+
+
+void Bitmap::ImplSetSalBitmap(const std::shared_ptr<SalBitmap>& xImpBmp)
+{
+    mxSalBmp = xImpBmp;
+}
+
+BitmapInfoAccess* Bitmap::AcquireInfoAccess()
+{
+    std::unique_ptr<BitmapInfoAccess> pInfoAccess(new BitmapInfoAccess( *this ));
+
+    if( !*pInfoAccess )
+    {
+        return nullptr;
+    }
+
+    return pInfoAccess.release();
+}
+
+BitmapReadAccess* Bitmap::AcquireReadAccess()
+{
+    std::unique_ptr<BitmapReadAccess> pReadAccess(new BitmapReadAccess( *this ));
+
+    if( !*pReadAccess )
+    {
+        return nullptr;
+    }
+
+    return pReadAccess.release();
+}
+
+BitmapWriteAccess* Bitmap::AcquireWriteAccess()
+{
+    std::unique_ptr<BitmapWriteAccess> pWriteAccess(new BitmapWriteAccess( *this ));
+
+    if( !*pWriteAccess )
+    {
+        return nullptr;
+    }
+
+    return pWriteAccess.release();
+}
+
+void Bitmap::ReleaseAccess( BitmapInfoAccess* pBitmapAccess )
+{
+    delete pBitmapAccess;
+}
+
+bool Bitmap::Crop( const tools::Rectangle& rRectPixel )
+{
+    const Size          aSizePix( GetSizePixel() );
+    tools::Rectangle           aRect( rRectPixel );
+    bool                bRet = false;
+
+    aRect.Intersection( tools::Rectangle( Point(), aSizePix ) );
+
+    if( !aRect.IsEmpty() && aSizePix != aRect.GetSize())
+    {
+        ScopedReadAccess pReadAcc(*this);
+
+        if( pReadAcc )
+        {
+            const tools::Rectangle     aNewRect( Point(), aRect.GetSize() );
+            Bitmap              aNewBmp( aNewRect.GetSize(), GetBitCount(), &pReadAcc->GetPalette() );
+            BitmapScopedWriteAccess pWriteAcc(aNewBmp);
+
+            if( pWriteAcc )
+            {
+                const long nOldX = aRect.Left();
+                const long nOldY = aRect.Top();
+                const long nNewWidth = aNewRect.GetWidth();
+                const long nNewHeight = aNewRect.GetHeight();
+
+                for( long nY = 0, nY2 = nOldY; nY < nNewHeight; nY++, nY2++ )
+                {
+                    Scanline pScanline = pWriteAcc->GetScanline(nY);
+                    Scanline pScanlineRead = pReadAcc->GetScanline(nY2);
+                    for( long nX = 0, nX2 = nOldX; nX < nNewWidth; nX++, nX2++ )
+                        pWriteAcc->SetPixelOnData( pScanline, nX, pReadAcc->GetPixelFromData( pScanlineRead, nX2 ) );
+                }
+
+                pWriteAcc.reset();
+                bRet = true;
+            }
+
+            pReadAcc.reset();
+
+            if( bRet )
+                ReassignWithSize( aNewBmp );
+        }
+    }
+
+    return bRet;
+};
+
+bool Bitmap::CopyPixel( const tools::Rectangle& rRectDst,
+                        const tools::Rectangle& rRectSrc, const Bitmap* pBmpSrc )
+{
+    const Size  aSizePix( GetSizePixel() );
+    tools::Rectangle   aRectDst( rRectDst );
+    bool        bRet = false;
+
+    aRectDst.Intersection( tools::Rectangle( Point(), aSizePix ) );
+
+    if( !aRectDst.IsEmpty() )
+    {
+        if( pBmpSrc && ( pBmpSrc->mxSalBmp != mxSalBmp ) )
+        {
+            Bitmap*         pSrc = const_cast<Bitmap*>(pBmpSrc);
+            const Size      aCopySizePix( pSrc->GetSizePixel() );
+            tools::Rectangle       aRectSrc( rRectSrc );
+            const sal_uInt16    nSrcBitCount = pBmpSrc->GetBitCount();
+            const sal_uInt16    nDstBitCount = GetBitCount();
+
+            if( nSrcBitCount > nDstBitCount )
+            {
+                int nNextIndex = 0;
+
+                if (nSrcBitCount == 24)
+                    Convert( BmpConversion::N24Bit );
+                else if (nSrcBitCount == 8)
+                {
+                    Convert( BmpConversion::N8BitColors );
+                    nNextIndex = 16;
+                }
+                else if (nSrcBitCount == 4)
+                {
+                    Convert( BmpConversion::N4BitColors );
+                    nNextIndex = 2;
+                }
+
+                if( nNextIndex )
+                {
+                    ScopedReadAccess    pSrcAcc(*pSrc);
+                    BitmapScopedWriteAccess pDstAcc(*this);
+
+                    if( pSrcAcc && pDstAcc )
+                    {
+                        const int nSrcCount = pDstAcc->GetPaletteEntryCount();
+                        const int nDstCount = 1 << nDstBitCount;
+
+                        for (int i = 0; ( i < nSrcCount ) && ( nNextIndex < nSrcCount ); ++i)
+                        {
+                            const BitmapColor& rSrcCol = pSrcAcc->GetPaletteColor( static_cast<sal_uInt16>(i) );
+
+                            bool bFound = false;
+
+                            for (int j = 0; j < nDstCount; ++j)
+                            {
+                                if( rSrcCol == pDstAcc->GetPaletteColor( static_cast<sal_uInt16>(j) ) )
+                                {
+                                    bFound = true;
+                                    break;
+                                }
+                            }
+
+                            if( !bFound )
+                                pDstAcc->SetPaletteColor( static_cast<sal_uInt16>(nNextIndex++), rSrcCol );
+                        }
+                    }
+                }
+            }
+
+            aRectSrc.Intersection( tools::Rectangle( Point(), aCopySizePix ) );
+
+            if( !aRectSrc.IsEmpty() )
+            {
+                ScopedReadAccess pReadAcc(*pSrc);
+
+                if( pReadAcc )
+                {
+                    BitmapScopedWriteAccess pWriteAcc(*this);
+
+                    if( pWriteAcc )
+                    {
+                        const long  nWidth = std::min( aRectSrc.GetWidth(), aRectDst.GetWidth() );
+                        const long  nHeight = std::min( aRectSrc.GetHeight(), aRectDst.GetHeight() );
+                        const long  nSrcEndX = aRectSrc.Left() + nWidth;
+                        const long  nSrcEndY = aRectSrc.Top() + nHeight;
+                        long        nDstY = aRectDst.Top();
+
+                        if( pReadAcc->HasPalette() && pWriteAcc->HasPalette() )
+                        {
+                            const sal_uInt16    nCount = pReadAcc->GetPaletteEntryCount();
+                            std::unique_ptr<sal_uInt8[]> pMap(new sal_uInt8[ nCount ]);
+
+                            // Create index map for the color table, as the bitmap should be copied
+                            // retaining it's color information relatively well
+                            for( sal_uInt16 i = 0; i < nCount; i++ )
+                                pMap[ i ] = static_cast<sal_uInt8>(pWriteAcc->GetBestPaletteIndex( pReadAcc->GetPaletteColor( i ) ));
+
+                            for( long nSrcY = aRectSrc.Top(); nSrcY < nSrcEndY; nSrcY++, nDstY++ )
+                            {
+                                Scanline pScanline = pWriteAcc->GetScanline(nDstY);
+                                Scanline pScanlineRead = pReadAcc->GetScanline(nSrcY);
+                                for( long nSrcX = aRectSrc.Left(), nDstX = aRectDst.Left(); nSrcX < nSrcEndX; nSrcX++, nDstX++ )
+                                    pWriteAcc->SetPixelOnData( pScanline, nDstX, BitmapColor( pMap[ pReadAcc->GetIndexFromData( pScanlineRead, nSrcX ) ] ));
+                            }
+                        }
+                        else if( pReadAcc->HasPalette() )
+                        {
+                            for( long nSrcY = aRectSrc.Top(); nSrcY < nSrcEndY; nSrcY++, nDstY++ )
+                            {
+                                Scanline pScanline = pWriteAcc->GetScanline(nDstY);
+                                Scanline pScanlineRead = pReadAcc->GetScanline(nSrcY);
+                                for( long nSrcX = aRectSrc.Left(), nDstX = aRectDst.Left(); nSrcX < nSrcEndX; nSrcX++, nDstX++ )
+                                    pWriteAcc->SetPixelOnData( pScanline, nDstX, pReadAcc->GetPaletteColor( pReadAcc->GetIndexFromData( pScanlineRead, nSrcX ) ) );
+                            }
+                        }
+                        else
+                            for( long nSrcY = aRectSrc.Top(); nSrcY < nSrcEndY; nSrcY++, nDstY++ )
+                            {
+                                Scanline pScanline = pWriteAcc->GetScanline(nDstY);
+                                Scanline pScanlineRead = pReadAcc->GetScanline(nSrcY);
+                                for( long nSrcX = aRectSrc.Left(), nDstX = aRectDst.Left(); nSrcX < nSrcEndX; nSrcX++, nDstX++ )
+                                    pWriteAcc->SetPixelOnData( pScanline, nDstX, pReadAcc->GetPixelFromData( pScanlineRead, nSrcX ) );
+                            }
+
+                        pWriteAcc.reset();
+                        bRet = ( nWidth > 0 ) && ( nHeight > 0 );
+                    }
+
+                    pReadAcc.reset();
+                }
+            }
+        }
+        else
+        {
+            tools::Rectangle aRectSrc( rRectSrc );
+
+            aRectSrc.Intersection( tools::Rectangle( Point(), aSizePix ) );
+
+            if( !aRectSrc.IsEmpty() && ( aRectSrc != aRectDst ) )
+            {
+                BitmapScopedWriteAccess   pWriteAcc(*this);
+
+                if( pWriteAcc )
+                {
+                    const long  nWidth = std::min( aRectSrc.GetWidth(), aRectDst.GetWidth() );
+                    const long  nHeight = std::min( aRectSrc.GetHeight(), aRectDst.GetHeight() );
+                    const long  nSrcX = aRectSrc.Left();
+                    const long  nSrcY = aRectSrc.Top();
+                    const long  nSrcEndX1 = nSrcX + nWidth - 1;
+                    const long  nSrcEndY1 = nSrcY + nHeight - 1;
+                    const long  nDstX = aRectDst.Left();
+                    const long  nDstY = aRectDst.Top();
+                    const long  nDstEndX1 = nDstX + nWidth - 1;
+                    const long  nDstEndY1 = nDstY + nHeight - 1;
+
+                    if( ( nDstX <= nSrcX ) && ( nDstY <= nSrcY ) )
+                    {
+                        for( long nY = nSrcY, nYN = nDstY; nY <= nSrcEndY1; nY++, nYN++ )
+                        {
+                            Scanline pScanline = pWriteAcc->GetScanline(nYN);
+                            Scanline pScanlineSrc = pWriteAcc->GetScanline(nY);
+                            for( long nX = nSrcX, nXN = nDstX; nX <= nSrcEndX1; nX++, nXN++ )
+                                pWriteAcc->SetPixelOnData( pScanline, nXN, pWriteAcc->GetPixelFromData( pScanlineSrc, nX ) );
+                        }
+                    }
+                    else if( ( nDstX <= nSrcX ) && ( nDstY >= nSrcY ) )
+                    {
+                        for( long nY = nSrcEndY1, nYN = nDstEndY1; nY >= nSrcY; nY--, nYN-- )
+                        {
+                            Scanline pScanline = pWriteAcc->GetScanline(nYN);
+                            Scanline pScanlineSrc = pWriteAcc->GetScanline(nY);
+                            for( long nX = nSrcX, nXN = nDstX; nX <= nSrcEndX1; nX++, nXN++ )
+                                pWriteAcc->SetPixelOnData( pScanline, nXN, pWriteAcc->GetPixelFromData( pScanlineSrc, nX ) );
+                        }
+                    }
+                    else if( ( nDstX >= nSrcX ) && ( nDstY <= nSrcY ) )
+                    {
+                        for( long nY = nSrcY, nYN = nDstY; nY <= nSrcEndY1; nY++, nYN++ )
+                        {
+                            Scanline pScanline = pWriteAcc->GetScanline(nYN);
+                            Scanline pScanlineSrc = pWriteAcc->GetScanline(nY);
+                            for( long nX = nSrcEndX1, nXN = nDstEndX1; nX >= nSrcX; nX--, nXN-- )
+                                pWriteAcc->SetPixelOnData( pScanline, nXN, pWriteAcc->GetPixelFromData( pScanlineSrc, nX ) );
+                        }
+                    }
+                    else
+                    {
+                        for( long nY = nSrcEndY1, nYN = nDstEndY1; nY >= nSrcY; nY--, nYN-- )
+                        {
+                            Scanline pScanline = pWriteAcc->GetScanline(nYN);
+                            Scanline pScanlineSrc = pWriteAcc->GetScanline(nY);
+                            for( long nX = nSrcEndX1, nXN = nDstEndX1; nX >= nSrcX; nX--, nXN-- )
+                                pWriteAcc->SetPixelOnData( pScanline, nXN, pWriteAcc->GetPixelFromData( pScanlineSrc, nX ) );
+                        }
+                    }
+
+                    pWriteAcc.reset();
+                    bRet = true;
+                }
+            }
+        }
+    }
+
+    return bRet;
+}
+
+bool Bitmap::CopyPixel_AlphaOptimized( const tools::Rectangle& rRectDst, const tools::Rectangle& rRectSrc,
+                           const Bitmap* pBmpSrc )
+{
+    // Note: this code is copied from Bitmap::CopyPixel but avoids any palette lookups
+    // This optimization is possible because the palettes of AlphaMasks are always identical (8bit GreyPalette, see ctor)
+    const Size  aSizePix( GetSizePixel() );
+    tools::Rectangle   aRectDst( rRectDst );
+    bool        bRet = false;
+
+    aRectDst.Intersection( tools::Rectangle( Point(), aSizePix ) );
+
+    if( !aRectDst.IsEmpty() )
+    {
+        if( pBmpSrc && ( pBmpSrc->mxSalBmp != mxSalBmp ) )
+        {
+            Bitmap*         pSrc = const_cast<Bitmap*>(pBmpSrc);
+            const Size      aCopySizePix( pSrc->GetSizePixel() );
+            tools::Rectangle       aRectSrc( rRectSrc );
+
+            aRectSrc.Intersection( tools::Rectangle( Point(), aCopySizePix ) );
+
+            if( !aRectSrc.IsEmpty() )
+            {
+                ScopedReadAccess pReadAcc(*pSrc);
+
+                if( pReadAcc )
+                {
+                    BitmapScopedWriteAccess pWriteAcc(*this);
+
+                    if( pWriteAcc )
+                    {
+                        const long  nWidth = std::min( aRectSrc.GetWidth(), aRectDst.GetWidth() );
+                        const long  nHeight = std::min( aRectSrc.GetHeight(), aRectDst.GetHeight() );
+                        const long  nSrcEndX = aRectSrc.Left() + nWidth;
+                        const long  nSrcEndY = aRectSrc.Top() + nHeight;
+                        long        nDstY = aRectDst.Top();
+
+                        for( long nSrcY = aRectSrc.Top(); nSrcY < nSrcEndY; nSrcY++, nDstY++)
+                        {
+                            Scanline pScanline = pWriteAcc->GetScanline(nDstY);
+                            Scanline pScanlineRead = pReadAcc->GetScanline(nSrcY);
+                            for( long nSrcX = aRectSrc.Left(), nDstX = aRectDst.Left(); nSrcX < nSrcEndX; nSrcX++, nDstX++ )
+                                pWriteAcc->SetPixelOnData( pScanline, nDstX, pReadAcc->GetPixelFromData( pScanlineRead, nSrcX ) );
+                        }
+
+                        pWriteAcc.reset();
+                        bRet = ( nWidth > 0 ) && ( nHeight > 0 );
+                    }
+
+                    pReadAcc.reset();
+                }
+            }
+        }
+        else
+        {
+            tools::Rectangle aRectSrc( rRectSrc );
+
+            aRectSrc.Intersection( tools::Rectangle( Point(), aSizePix ) );
+
+            if( !aRectSrc.IsEmpty() && ( aRectSrc != aRectDst ) )
+            {
+                BitmapScopedWriteAccess   pWriteAcc(*this);
+
+                if( pWriteAcc )
+                {
+                    const long  nWidth = std::min( aRectSrc.GetWidth(), aRectDst.GetWidth() );
+                    const long  nHeight = std::min( aRectSrc.GetHeight(), aRectDst.GetHeight() );
+                    const long  nSrcX = aRectSrc.Left();
+                    const long  nSrcY = aRectSrc.Top();
+                    const long  nSrcEndX1 = nSrcX + nWidth - 1;
+                    const long  nSrcEndY1 = nSrcY + nHeight - 1;
+                    const long  nDstX = aRectDst.Left();
+                    const long  nDstY = aRectDst.Top();
+                    const long  nDstEndX1 = nDstX + nWidth - 1;
+                    const long  nDstEndY1 = nDstY + nHeight - 1;
+
+                    if( ( nDstX <= nSrcX ) && ( nDstY <= nSrcY ) )
+                    {
+                        for( long nY = nSrcY, nYN = nDstY; nY <= nSrcEndY1; nY++, nYN++ )
+                        {
+                            Scanline pScanline = pWriteAcc->GetScanline(nYN);
+                            Scanline pScanlineSrc = pWriteAcc->GetScanline(nY);
+                            for( long nX = nSrcX, nXN = nDstX; nX <= nSrcEndX1; nX++, nXN++ )
+                                pWriteAcc->SetPixelOnData( pScanline, nXN, pWriteAcc->GetPixelFromData( pScanlineSrc, nX ) );
+                        }
+                    }
+                    else if( ( nDstX <= nSrcX ) && ( nDstY >= nSrcY ) )
+                    {
+                        for( long nY = nSrcEndY1, nYN = nDstEndY1; nY >= nSrcY; nY--, nYN-- )
+                        {
+                            Scanline pScanline = pWriteAcc->GetScanline(nYN);
+                            Scanline pScanlineSrc = pWriteAcc->GetScanline(nY);
+                            for( long nX = nSrcX, nXN = nDstX; nX <= nSrcEndX1; nX++, nXN++ )
+                                pWriteAcc->SetPixelOnData( pScanline, nXN, pWriteAcc->GetPixelFromData( pScanlineSrc, nX ) );
+                        }
+                    }
+                    else if( ( nDstX >= nSrcX ) && ( nDstY <= nSrcY ) )
+                    {
+                        for( long nY = nSrcY, nYN = nDstY; nY <= nSrcEndY1; nY++, nYN++ )
+                        {
+                            Scanline pScanline = pWriteAcc->GetScanline(nYN);
+                            Scanline pScanlineSrc = pWriteAcc->GetScanline(nY);
+                            for( long nX = nSrcEndX1, nXN = nDstEndX1; nX >= nSrcX; nX--, nXN-- )
+                                pWriteAcc->SetPixelOnData( pScanline, nXN, pWriteAcc->GetPixelFromData( pScanlineSrc, nX ) );
+                        }
+                    }
+                    else
+                    {
+                        for( long nY = nSrcEndY1, nYN = nDstEndY1; nY >= nSrcY; nY--, nYN-- )
+                        {
+                            Scanline pScanline = pWriteAcc->GetScanline(nYN);
+                            Scanline pScanlineSrc = pWriteAcc->GetScanline(nY);
+                            for( long nX = nSrcEndX1, nXN = nDstEndX1; nX >= nSrcX; nX--, nXN-- )
+                                pWriteAcc->SetPixelOnData( pScanline, nXN, pWriteAcc->GetPixelFromData( pScanlineSrc, nX ) );
+                        }
+                    }
+
+                    pWriteAcc.reset();
+                    bRet = true;
+                }
+            }
+        }
+    }
+
+    return bRet;
+
+}
+
+bool Bitmap::Expand( sal_uLong nDX, sal_uLong nDY, const Color* pInitColor )
+{
+    bool bRet = false;
+
+    if( nDX || nDY )
+    {
+        const Size          aSizePixel( GetSizePixel() );
+        const long          nWidth = aSizePixel.Width();
+        const long          nHeight = aSizePixel.Height();
+        const Size          aNewSize( nWidth + nDX, nHeight + nDY );
+        ScopedReadAccess    pReadAcc(*this);
+
+        if( pReadAcc )
+        {
+            BitmapPalette       aBmpPal( pReadAcc->GetPalette() );
+            Bitmap              aNewBmp( aNewSize, GetBitCount(), &aBmpPal );
+            BitmapScopedWriteAccess pWriteAcc(aNewBmp);
+
+            if( pWriteAcc )
+            {
+                BitmapColor aColor;
+                const long  nNewX = nWidth;
+                const long  nNewY = nHeight;
+                const long  nNewWidth = pWriteAcc->Width();
+                const long  nNewHeight = pWriteAcc->Height();
+                long        nX;
+                long        nY;
+
+                if( pInitColor )
+                    aColor = pWriteAcc->GetBestMatchingColor( *pInitColor );
+
+                for( nY = 0; nY < nHeight; nY++ )
+                {
+                    pWriteAcc->CopyScanline( nY, *pReadAcc );
+
+                    if( pInitColor && nDX )
+                    {
+                        Scanline pScanline = pWriteAcc->GetScanline(nY);
+                        for( nX = nNewX; nX < nNewWidth; nX++ )
+                            pWriteAcc->SetPixelOnData( pScanline, nX, aColor );
+                    }
+                }
+
+                if( pInitColor && nDY )
+                    for( nY = nNewY; nY < nNewHeight; nY++ )
+                    {
+                        Scanline pScanline = pWriteAcc->GetScanline(nY);
+                        for( nX = 0; nX < nNewWidth; nX++ )
+                            pWriteAcc->SetPixelOnData( pScanline, nX, aColor );
+                    }
+
+                pWriteAcc.reset();
+                bRet = true;
+            }
+
+            pReadAcc.reset();
+
+            if (bRet)
+                ReassignWithSize(aNewBmp);
+        }
+    }
+
+    return bRet;
+}
+
+Bitmap Bitmap::CreateDisplayBitmap( OutputDevice* pDisplay ) const
+{
+    Bitmap aDispBmp( *this );
+
+    SalGraphics* pDispGraphics = pDisplay->GetGraphics();
+
+    if( mxSalBmp && pDispGraphics )
+    {
+        std::shared_ptr<SalBitmap> xImpDispBmp(ImplGetSVData()->mpDefInst->CreateSalBitmap());
+        if (xImpDispBmp->Create(*mxSalBmp, pDispGraphics))
+            aDispBmp.ImplSetSalBitmap(xImpDispBmp);
+    }
+
+    return aDispBmp;
+}
+
+bool Bitmap::GetSystemData( BitmapSystemData& rData ) const
+{
+    return mxSalBmp && mxSalBmp->GetSystemData(rData);
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */