/* -*- 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 "winmtf.hxx"

#include <memory>
#include <boost/optional.hpp>
#include <vcl/gdimtf.hxx>
#include <vcl/wmf.hxx>
#include <rtl/crc.h>
#include <rtl/tencinfo.h>
#include <osl/endian.h>
#include <vcl/svapp.hxx>
#include <vcl/dibtools.hxx>
#include <tools/fract.hxx>
#include <o3tl/make_unique.hxx>

// MS Windows defines

#define W_META_SETBKCOLOR           0x0201
#define W_META_SETBKMODE            0x0102
#define W_META_SETMAPMODE           0x0103
#define W_META_SETROP2              0x0104
#define W_META_SETRELABS            0x0105
#define W_META_SETPOLYFILLMODE      0x0106
#define W_META_SETSTRETCHBLTMODE    0x0107
#define W_META_SETTEXTCHAREXTRA     0x0108
#define W_META_SETTEXTCOLOR         0x0209
#define W_META_SETTEXTJUSTIFICATION 0x020A
#define W_META_SETWINDOWORG         0x020B
#define W_META_SETWINDOWEXT         0x020C
#define W_META_SETVIEWPORTORG       0x020D
#define W_META_SETVIEWPORTEXT       0x020E
#define W_META_OFFSETWINDOWORG      0x020F
#define W_META_SCALEWINDOWEXT       0x0410
#define W_META_OFFSETVIEWPORTORG    0x0211
#define W_META_SCALEVIEWPORTEXT     0x0412
#define W_META_LINETO               0x0213
#define W_META_MOVETO               0x0214
#define W_META_EXCLUDECLIPRECT      0x0415
#define W_META_INTERSECTCLIPRECT    0x0416
#define W_META_ARC                  0x0817
#define W_META_ELLIPSE              0x0418
#define W_META_FLOODFILL            0x0419
#define W_META_PIE                  0x081A
#define W_META_RECTANGLE            0x041B
#define W_META_ROUNDRECT            0x061C
#define W_META_PATBLT               0x061D
#define W_META_SAVEDC               0x001E
#define W_META_SETPIXEL             0x041F
#define W_META_OFFSETCLIPRGN        0x0220
#define W_META_TEXTOUT              0x0521
#define W_META_BITBLT               0x0922
#define W_META_STRETCHBLT           0x0B23
#define W_META_POLYGON              0x0324
#define W_META_POLYLINE             0x0325
#define W_META_ESCAPE               0x0626
#define W_META_RESTOREDC            0x0127
#define W_META_FILLREGION           0x0228
#define W_META_FRAMEREGION          0x0429
#define W_META_INVERTREGION         0x012A
#define W_META_PAINTREGION          0x012B
#define W_META_SELECTCLIPREGION     0x012C
#define W_META_SELECTOBJECT         0x012D
#define W_META_SETTEXTALIGN         0x012E
#define W_META_DRAWTEXT             0x062F
#define W_META_CHORD                0x0830
#define W_META_SETMAPPERFLAGS       0x0231
#define W_META_EXTTEXTOUT           0x0a32
#define W_META_SETDIBTODEV          0x0d33
#define W_META_SELECTPALETTE        0x0234
#define W_META_REALIZEPALETTE       0x0035
#define W_META_ANIMATEPALETTE       0x0436
#define W_META_SETPALENTRIES        0x0037
#define W_META_POLYPOLYGON          0x0538
#define W_META_RESIZEPALETTE        0x0139
#define W_META_DIBBITBLT            0x0940
#define W_META_DIBSTRETCHBLT        0x0b41
#define W_META_DIBCREATEPATTERNBRUSH 0x0142
#define W_META_STRETCHDIB           0x0f43
#define W_META_EXTFLOODFILL         0x0548
#define W_META_RESETDC              0x014C
#define W_META_STARTDOC             0x014D
#define W_META_STARTPAGE            0x004F
#define W_META_ENDPAGE              0x0050
#define W_META_ABORTDOC             0x0052
#define W_META_ENDDOC               0x005E
#define W_META_DELETEOBJECT         0x01f0
#define W_META_CREATEPALETTE        0x00f7
#define W_META_CREATEBRUSH          0x00F8
#define W_META_CREATEPATTERNBRUSH   0x01F9
#define W_META_CREATEPENINDIRECT    0x02FA
#define W_META_CREATEFONTINDIRECT   0x02FB
#define W_META_CREATEBRUSHINDIRECT  0x02FC
#define W_META_CREATEBITMAPINDIRECT 0x02FD
#define W_META_CREATEBITMAP         0x06FE
#define W_META_CREATEREGION         0x06FF

static void GetWinExtMax( const Point& rSource, tools::Rectangle& rPlaceableBound, const sal_Int16 nMapMode )
{
    Point aSource( rSource );
    if ( nMapMode == MM_HIMETRIC )
        aSource.Y() = -rSource.Y();
    if ( aSource.X() < rPlaceableBound.Left() )
        rPlaceableBound.Left() = aSource.X();
    if ( aSource.X() > rPlaceableBound.Right() )
        rPlaceableBound.Right() = aSource.X();
    if ( aSource.Y() < rPlaceableBound.Top() )
        rPlaceableBound.Top() = aSource.Y();
    if ( aSource.Y() > rPlaceableBound.Bottom() )
        rPlaceableBound.Bottom() = aSource.Y();
}

static void GetWinExtMax( const tools::Rectangle& rSource, tools::Rectangle& rPlaceableBound, const sal_Int16 nMapMode )
{
    GetWinExtMax( rSource.TopLeft(), rPlaceableBound, nMapMode );
    GetWinExtMax( rSource.BottomRight(), rPlaceableBound, nMapMode );
}

inline Point WMFReader::ReadPoint()
{
    short nX = 0, nY = 0;
    pWMF->ReadInt16( nX ).ReadInt16( nY );
    return Point( nX, nY );
}

inline Point WMFReader::ReadYX()
{
    short nX = 0, nY = 0;
    pWMF->ReadInt16( nY ).ReadInt16( nX );
    return Point( nX, nY );
}

tools::Rectangle WMFReader::ReadRectangle()
{
    Point aBR, aTL;
    aBR = ReadYX();
    aTL = ReadYX();
    aBR.X()--;
    aBR.Y()--;
    return tools::Rectangle( aTL, aBR );
}

Size WMFReader::ReadYXExt()
{
    short nW=0, nH=0;
    pWMF->ReadInt16( nH ).ReadInt16( nW );
    return Size( nW, nH );
}

void WMFReader::ReadRecordParams( sal_uInt16 nFunc )
{
    switch( nFunc )
    {
        case W_META_SETBKCOLOR:
        {
            pOut->SetBkColor( ReadColor() );
        }
        break;

        case W_META_SETBKMODE:
        {
            sal_uInt16 nDat = 0;
            pWMF->ReadUInt16( nDat );
            pOut->SetBkMode( static_cast<BkMode>(nDat) );
        }
        break;

        // !!!
        case W_META_SETMAPMODE:
        {
            sal_Int16 nMapMode = 0;
            pWMF->ReadInt16( nMapMode );
            pOut->SetMapMode( nMapMode );
        }
        break;

        case W_META_SETROP2:
        {
            sal_uInt16 nROP2 = 0;
            pWMF->ReadUInt16( nROP2 );
            pOut->SetRasterOp( (WMFRasterOp)nROP2 );
        }
        break;

        case W_META_SETTEXTCOLOR:
        {
            pOut->SetTextColor( ReadColor() );
        }
        break;

        case W_META_SETWINDOWORG:
        {
            pOut->SetWinOrg( ReadYX() );
        }
        break;

        case W_META_SETWINDOWEXT:
        {
            short nWidth = 0, nHeight = 0;
            pWMF->ReadInt16( nHeight ).ReadInt16( nWidth );
            pOut->SetWinExt( Size( nWidth, nHeight ) );
        }
        break;

        case W_META_OFFSETWINDOWORG:
        {
            short nXAdd = 0, nYAdd = 0;
            pWMF->ReadInt16( nYAdd ).ReadInt16( nXAdd );
            pOut->SetWinOrgOffset( nXAdd, nYAdd );
        }
        break;

        case W_META_SCALEWINDOWEXT:
        {
            short nXNum = 0, nXDenom = 0, nYNum = 0, nYDenom = 0;
            pWMF->ReadInt16( nYDenom ).ReadInt16( nYNum ).ReadInt16( nXDenom ).ReadInt16( nXNum );
            if (!nYDenom || !nXDenom)
            {
                pWMF->SetError( SVSTREAM_FILEFORMAT_ERROR );
                break;
            }
            pOut->ScaleWinExt( (double)nXNum / nXDenom, (double)nYNum / nYDenom );
        }
        break;

        case W_META_SETVIEWPORTORG:
        case W_META_SETVIEWPORTEXT:
        break;

        case W_META_OFFSETVIEWPORTORG:
        {
            short nXAdd = 0, nYAdd = 0;
            pWMF->ReadInt16( nYAdd ).ReadInt16( nXAdd );
            pOut->SetDevOrgOffset( nXAdd, nYAdd );
        }
        break;

        case W_META_SCALEVIEWPORTEXT:
        {
            short nXNum = 0, nXDenom = 0, nYNum = 0, nYDenom = 0;
            pWMF->ReadInt16( nYDenom ).ReadInt16( nYNum ).ReadInt16( nXDenom ).ReadInt16( nXNum );
            if (!nYDenom || !nXDenom)
            {
                pWMF->SetError( SVSTREAM_FILEFORMAT_ERROR );
                break;
            }
            pOut->ScaleDevExt( (double)nXNum / nXDenom, (double)nYNum / nYDenom );
        }
        break;

        case W_META_LINETO:
        {
            pOut->LineTo( ReadYX() );
        }
        break;

        case W_META_MOVETO:
        {
            pOut->MoveTo( ReadYX() );
        }
        break;

        case W_META_INTERSECTCLIPRECT:
        {
            pOut->IntersectClipRect( ReadRectangle() );
        }
        break;

        case W_META_RECTANGLE:
        {
            pOut->DrawRect( ReadRectangle() );
        }
        break;

        case W_META_ROUNDRECT:
        {
            Size aSize( ReadYXExt() );
            pOut->DrawRoundRect( ReadRectangle(), Size( aSize.Width() / 2, aSize.Height() / 2 ) );
        }
        break;

        case W_META_ELLIPSE:
        {
            pOut->DrawEllipse( ReadRectangle() );
        }
        break;

        case W_META_ARC:
        {
            Point aEnd( ReadYX() );
            Point aStart( ReadYX() );
            tools::Rectangle aRect( ReadRectangle() );
            aRect.Justify();
            pOut->DrawArc( aRect, aStart, aEnd );
        }
        break;

        case W_META_PIE:
        {
            Point     aEnd( ReadYX() );
            Point     aStart( ReadYX() );
            tools::Rectangle aRect( ReadRectangle() );
            aRect.Justify();

            // #i73608# OutputDevice deviates from WMF
            // semantics. start==end means full ellipse here.
            if( aStart == aEnd )
                pOut->DrawEllipse( aRect );
            else
                pOut->DrawPie( aRect, aStart, aEnd );
        }
        break;

        case W_META_CHORD:
        {
            Point aEnd( ReadYX() );
            Point aStart( ReadYX() );
            tools::Rectangle aRect( ReadRectangle() );
            aRect.Justify();
            pOut->DrawChord( aRect, aStart, aEnd );
        }
        break;

        case W_META_POLYGON:
        {
            bool bRecordOk = true;

            sal_uInt16 nPoints(0);
            pWMF->ReadUInt16(nPoints);

            if (nPoints > pWMF->remainingSize() / (2 * sizeof(sal_uInt16)))
            {
                bRecordOk = false;
            }
            else
            {
                tools::Polygon aPoly(nPoints);
                for (sal_uInt16 i(0); i < nPoints && pWMF->good(); ++i)
                    aPoly[ i ] = ReadPoint();
                pOut->DrawPolygon(aPoly, false/*bRecordPath*/);
            }

            SAL_WARN_IF(!bRecordOk, "vcl.wmf", "polygon record has more points than we can handle");

            bRecordOk &= pWMF->good();

            if (!bRecordOk)
            {
                pWMF->SetError( SVSTREAM_FILEFORMAT_ERROR );
                break;
            }
        }
        break;

        case W_META_POLYPOLYGON:
        {
            sal_uInt16 nPolyCount(0);
            // Number of polygons:
            pWMF->ReadUInt16( nPolyCount );
            if (nPolyCount && pWMF->good())
            {
                bool bRecordOk = true;
                if (nPolyCount > pWMF->remainingSize() / sizeof(sal_uInt16))
                {
                    break;
                }

                // Number of points of each polygon. Determine total number of points
                std::unique_ptr<sal_uInt16[]> xPolygonPointCounts(new sal_uInt16[nPolyCount]);
                sal_uInt16* pnPoints = xPolygonPointCounts.get();
                tools::PolyPolygon aPolyPoly(nPolyCount, nPolyCount);
                sal_uInt16 nPoints = 0;
                for (sal_uInt16 a = 0; a < nPolyCount && pWMF->good(); ++a)
                {
                    pWMF->ReadUInt16( pnPoints[a] );

                    if (pnPoints[a] > SAL_MAX_UINT16 - nPoints)
                    {
                        bRecordOk = false;
                        break;
                    }

                    nPoints += pnPoints[a];
                }

                SAL_WARN_IF(!bRecordOk, "vcl.wmf", "polypolygon record has more polygons than we can handle");

                bRecordOk &= pWMF->good();

                if (!bRecordOk)
                {
                    pWMF->SetError( SVSTREAM_FILEFORMAT_ERROR );
                    break;
                }

                // Polygon points are:
                for (sal_uInt16 a = 0; a < nPolyCount && pWMF->good(); ++a)
                {
                    const sal_uInt16 nPointCount(pnPoints[a]);

                    if (nPointCount > pWMF->remainingSize() / (2 * sizeof(sal_uInt16)))
                    {
                        bRecordOk = false;
                        break;
                    }

                    std::unique_ptr<Point[]> xPolygonPoints(new Point[nPointCount]);
                    Point* pPtAry = xPolygonPoints.get();

                    for(sal_uInt16 b(0); b < nPointCount && pWMF->good(); ++b)
                    {
                        pPtAry[b] = ReadPoint();
                    }

                    aPolyPoly.Insert( tools::Polygon(nPointCount, pPtAry) );
                }

                bRecordOk &= pWMF->good();

                if (!bRecordOk)
                {
                    pWMF->SetError( SVSTREAM_FILEFORMAT_ERROR );
                    break;
                }

                pOut->DrawPolyPolygon( aPolyPoly );
            }
        }
        break;

        case W_META_POLYLINE:
        {
            bool bRecordOk = true;

            sal_uInt16 nPoints(0);
            pWMF->ReadUInt16(nPoints);

            if (nPoints > pWMF->remainingSize() / (2 * sizeof(sal_uInt16)))
            {
                bRecordOk = false;
            }
            else
            {
                tools::Polygon aPoly(nPoints);
                for (sal_uInt16 i(0); i < nPoints && pWMF->good(); ++i)
                    aPoly[ i ] = ReadPoint();
                pOut->DrawPolyLine( aPoly );
            }

            SAL_WARN_IF(!bRecordOk, "vcl.wmf", "polyline record has more points than we can handle");

            bRecordOk &= pWMF->good();

            if (!bRecordOk)
            {
                pWMF->SetError( SVSTREAM_FILEFORMAT_ERROR );
                break;
            }
        }
        break;

        case W_META_SAVEDC:
        {
            pOut->Push();
        }
        break;

        case W_META_RESTOREDC:
        {
            pOut->Pop();
        }
        break;

        case W_META_SETPIXEL:
        {
            const Color aColor = ReadColor();
            pOut->DrawPixel( ReadYX(), aColor );
        }
        break;

        case W_META_OFFSETCLIPRGN:
        {
            pOut->MoveClipRegion( ReadYXExt() );
        }
        break;

        case W_META_TEXTOUT:
        {
            sal_uInt16 nLength = 0;
            pWMF->ReadUInt16( nLength );
            if ( nLength )
            {
                std::unique_ptr<char[]> pChar(new char[ ( nLength + 1 ) &~ 1 ]);
                pWMF->ReadBytes(pChar.get(), (nLength + 1) &~ 1);
                OUString aText( pChar.get(), nLength, pOut->GetCharSet() );
                pChar.reset();
                Point aPosition( ReadYX() );
                pOut->DrawText( aPosition, aText );
            }
        }
        break;

        case W_META_EXTTEXTOUT:
        {
            pWMF->SeekRel(-6);
            sal_Int32 nRecordPos = pWMF->Tell(), nRecordSize = 0;
            pWMF->ReadInt32( nRecordSize );
            pWMF->SeekRel(2);
            Point aPosition = ReadYX();
            sal_uInt16 nLen = 0, nOptions = 0;
            pWMF->ReadUInt16( nLen ).ReadUInt16( nOptions );

            ComplexTextLayoutFlags nTextLayoutMode = ComplexTextLayoutFlags::Default;
            if ( nOptions & ETO_RTLREADING )
                nTextLayoutMode = ComplexTextLayoutFlags::BiDiRtl | ComplexTextLayoutFlags::TextOriginLeft;
            pOut->SetTextLayoutMode( nTextLayoutMode );
            SAL_WARN_IF( ( nOptions & ( ETO_PDY | ETO_GLYPH_INDEX ) ) != 0, "vcl.wmf", "SJ: ETO_PDY || ETO_GLYPH_INDEX in WMF" );

            // output only makes sense if the text contains characters
            if( nLen )
            {
                sal_Int32 nOriginalTextLen = nLen;
                sal_Int32 nOriginalBlockLen = ( nOriginalTextLen + 1 ) &~ 1;
                tools::Rectangle aRect;
                if( nOptions & ETO_CLIPPED )
                {
                    const Point aPt1( ReadPoint() );
                    const Point aPt2( ReadPoint() );
                    aRect = tools::Rectangle( aPt1, aPt2 );
                }

                auto nRemainingSize = pWMF->remainingSize();
                if (nRemainingSize < static_cast<sal_uInt32>(nOriginalBlockLen))
                {
                    SAL_WARN("vcl.wmf", "exttextout record claimed more data than the stream can provide");
                    nOriginalTextLen = nOriginalBlockLen = nRemainingSize;
                }

                std::unique_ptr<char[]> pChar(new char[nOriginalBlockLen]);
                pWMF->ReadBytes(pChar.get(), nOriginalBlockLen);
                OUString aText(pChar.get(), nOriginalTextLen, pOut->GetCharSet()); // after this conversion the text may contain
                sal_Int32 nNewTextLen = aText.getLength();                         // less character (japanese version), so the
                                                                                   // dxAry will not fit
                if ( nNewTextLen )
                {
                    std::unique_ptr<long[]> pDXAry, pDYAry;
                    sal_uInt32  nMaxStreamPos = nRecordPos + ( nRecordSize << 1 );
                    sal_Int32   nDxArySize =  nMaxStreamPos - pWMF->Tell();
                    sal_Int32   nDxAryEntries = nDxArySize >> 1;
                    bool        bUseDXAry = false;

                    if ( ( ( nDxAryEntries % nOriginalTextLen ) == 0 ) && ( nNewTextLen <= nOriginalTextLen ) )
                    {
                        sal_Int32 i; // needed just outside the for
                        pDXAry.reset(new long[ nNewTextLen ]);
                        if ( nOptions & ETO_PDY )
                        {
                            pDYAry.reset(new long[ nNewTextLen ]);
                        }
                        for (i = 0; i < nNewTextLen; i++ )
                        {
                            if ( pWMF->Tell() >= nMaxStreamPos )
                                break;
                            sal_Int32 nDxCount = 1;
                            if ( nNewTextLen != nOriginalTextLen )
                            {
                                sal_Unicode cUniChar = aText[i];
                                OString aTmp(&cUniChar, 1, pOut->GetCharSet());
                                if ( aTmp.getLength() > 1 )
                                {
                                    nDxCount = aTmp.getLength();
                                }
                            }

                            sal_Int16 nDx = 0, nDy = 0;
                            while ( nDxCount-- )
                            {
                                if ( ( pWMF->Tell() + 2 ) > nMaxStreamPos )
                                    break;
                                sal_Int16 nDxTmp = 0;
                                pWMF->ReadInt16(nDxTmp);
                                nDx += nDxTmp;
                                if ( nOptions & ETO_PDY )
                                {
                                    if ( ( pWMF->Tell() + 2 ) > nMaxStreamPos )
                                        break;
                                    sal_Int16 nDyTmp = 0;
                                    pWMF->ReadInt16(nDyTmp);
                                    nDy += nDyTmp;
                                }
                            }

                            pDXAry[ i ] = nDx;
                            if ( nOptions & ETO_PDY )
                            {
                                pDYAry[i] = nDy;
                            }
                        }
                        if ( i == nNewTextLen )
                            bUseDXAry = true;
                    }
                    if ( pDXAry && bUseDXAry )
                        pOut->DrawText( aPosition, aText, pDXAry.get(), pDYAry.get() );
                    else
                        pOut->DrawText( aPosition, aText );
                }
            }
        }
        break;

        case W_META_SELECTOBJECT:
        {
            sal_Int16   nObjIndex = 0;
            pWMF->ReadInt16( nObjIndex );
            pOut->SelectObject( nObjIndex );
        }
        break;

        case W_META_SETTEXTALIGN:
        {
            sal_uInt16  nAlign = 0;
            pWMF->ReadUInt16( nAlign );
            pOut->SetTextAlign( nAlign );
        }
        break;

        case W_META_BITBLT:
        {
            // 0-3   : nWinROP                      #93454#
            // 4-5   : y offset of source bitmap
            // 6-7   : x offset of source bitmap
            // 8-9   : used height of source bitmap
            // 10-11 : used width  of source bitmap
            // 12-13 : destination position y (in pixel)
            // 14-15 : destination position x (in pixel)
            // 16-17 : don't know
            // 18-19 : Width Bitmap in Pixel
            // 20-21 : Height Bitmap in Pixel
            // 22-23 : bytes per scanline
            // 24    : planes
            // 25    : bitcount

            sal_Int32   nWinROP = 0;
            sal_uInt16  nSx = 0, nSy = 0, nSxe = 0, nSye = 0, nDontKnow = 0, nWidth = 0, nHeight = 0, nBytesPerScan = 0;
            sal_uInt8   nPlanes, nBitCount;

            pWMF->ReadInt32( nWinROP )
                 .ReadUInt16( nSy ).ReadUInt16( nSx ).ReadUInt16( nSye ).ReadUInt16( nSxe );
            Point aPoint( ReadYX() );
            pWMF->ReadUInt16( nDontKnow ).ReadUInt16( nWidth ).ReadUInt16( nHeight ).ReadUInt16( nBytesPerScan ).ReadUChar( nPlanes ).ReadUChar( nBitCount );

            bool bOk = nWidth && nHeight && nPlanes == 1 && nBitCount == 1;
            if (bOk)
            {
                bOk = nBytesPerScan <= pWMF->remainingSize() / nHeight;
            }
            if (bOk)
            {
                Bitmap aBmp( Size( nWidth, nHeight ), nBitCount );
                Bitmap::ScopedWriteAccess pAcc(aBmp);
                if ( pAcc )
                {
                    for (sal_uInt16 y = 0; y < nHeight && pWMF->good(); ++y)
                    {
                        sal_uInt16 x = 0;
                        for (sal_uInt16 scan = 0; scan < nBytesPerScan; scan++ )
                        {
                            sal_Int8 nEightPixels = 0;
                            pWMF->ReadSChar( nEightPixels );
                            for (sal_Int8 i = 7; i >= 0; i-- )
                            {
                                if ( x < nWidth )
                                {
                                    pAcc->SetPixelIndex( y, x, (nEightPixels>>i)&1 );
                                }
                                x++;
                            }
                        }
                    }
                    pAcc.reset();
                    if ( nSye && nSxe &&
                        ( ( nSx + nSxe ) <= aBmp.GetSizePixel().Width() ) &&
                        ( ( nSy + nSye ) <= aBmp.GetSizePixel().Height() ) )
                    {
                        tools::Rectangle aCropRect( Point( nSx, nSy ), Size( nSxe, nSye ) );
                        aBmp.Crop( aCropRect );
                    }
                    tools::Rectangle aDestRect( aPoint, Size( nSxe, nSye ) );
                    aBmpSaveList.emplace_back(new BSaveStruct(aBmp, aDestRect, nWinROP));
                }
            }
        }
        break;

        case W_META_STRETCHBLT:
        case W_META_DIBBITBLT:
        case W_META_DIBSTRETCHBLT:
        case W_META_STRETCHDIB:
        {
            sal_Int32   nWinROP = 0;
            sal_uInt16  nSx = 0, nSy = 0, nSxe = 0, nSye = 0, nUsage = 0;
            Bitmap      aBmp;

            pWMF->ReadInt32( nWinROP );

            if( nFunc == W_META_STRETCHDIB )
                pWMF->ReadUInt16( nUsage );

            // nSye and nSxe is the number of pixels that has to been used
            // If they are set to zero, it is as indicator not to scale the bitmap later

            if( nFunc == W_META_STRETCHDIB || nFunc == W_META_STRETCHBLT || nFunc == W_META_DIBSTRETCHBLT )
                pWMF->ReadUInt16( nSye ).ReadUInt16( nSxe );

            // nSy and nx is the offset of the first pixel
            pWMF->ReadUInt16( nSy ).ReadUInt16( nSx );

            if( nFunc == W_META_STRETCHDIB || nFunc == W_META_DIBBITBLT || nFunc == W_META_DIBSTRETCHBLT )
            {
                if ( nWinROP == PATCOPY )
                    pWMF->ReadUInt16( nUsage );    // i don't know anything of this parameter, so its called nUsage
                                        // pOut->DrawRect( Rectangle( ReadYX(), aDestSize ), false );

                Size aDestSize( ReadYXExt() );
                if ( aDestSize.Width() && aDestSize.Height() )  // #92623# do not try to read buggy bitmaps
                {
                    tools::Rectangle aDestRect( ReadYX(), aDestSize );
                    if ( nWinROP != PATCOPY )
                        ReadDIB(aBmp, *pWMF, false);

                    // test if it is sensible to crop
                    if ( nSye && nSxe &&
                        ( ( nSx + nSxe ) <= aBmp.GetSizePixel().Width() ) &&
                        ( ( nSy + nSye ) <= aBmp.GetSizePixel().Height() ) )
                    {
                        tools::Rectangle aCropRect( Point( nSx, nSy ), Size( nSxe, nSye ) );
                        aBmp.Crop( aCropRect );
                    }
                    aBmpSaveList.emplace_back(new BSaveStruct(aBmp, aDestRect, nWinROP));
                }
            }
        }
        break;

        case W_META_DIBCREATEPATTERNBRUSH:
        {
            Bitmap  aBmp;
            sal_uInt32  nRed = 0, nGreen = 0, nBlue = 0, nCount = 1;
            sal_uInt16  nFunction = 0;

            pWMF->ReadUInt16( nFunction ).ReadUInt16( nFunction );

            ReadDIB(aBmp, *pWMF, false);
            Bitmap::ScopedReadAccess pBmp(aBmp);
            if ( pBmp )
            {
                for ( long y = 0; y < pBmp->Height(); y++ )
                {
                    for ( long x = 0; x < pBmp->Width(); x++ )
                    {
                        const BitmapColor aColor( pBmp->GetColor( y, x ) );

                        nRed += aColor.GetRed();
                        nGreen += aColor.GetGreen();
                        nBlue += aColor.GetBlue();
                    }
                }
                nCount = pBmp->Height() * pBmp->Width();
                if ( !nCount )
                    nCount++;
                pBmp.reset();
            }
            Color aColor( (sal_uInt8)( nRed / nCount ), (sal_uInt8)( nGreen / nCount ), (sal_uInt8)( nBlue / nCount ) );
            pOut->CreateObject(o3tl::make_unique<WinMtfFillStyle>( aColor, false ));
        }
        break;

        case W_META_DELETEOBJECT:
        {
            sal_Int16 nIndex = 0;
            pWMF->ReadInt16( nIndex );
            pOut->DeleteObject( nIndex );
        }
        break;

        case W_META_CREATEPALETTE:
        {
            pOut->CreateObject();
        }
        break;

        case W_META_CREATEBRUSH:
        {
            pOut->CreateObject(o3tl::make_unique<WinMtfFillStyle>( Color( COL_WHITE ), false ));
        }
        break;

        case W_META_CREATEPATTERNBRUSH:
        {
            pOut->CreateObject(o3tl::make_unique<WinMtfFillStyle>( Color( COL_WHITE ), false ));
        }
        break;

        case W_META_CREATEPENINDIRECT:
        {
            LineInfo   aLineInfo;
            sal_uInt16 nStyle = 0;
            sal_uInt16 nWidth = 0;
            sal_uInt16 nHeight = 0;

            pWMF->ReadUInt16(nStyle);
            pWMF->ReadUInt16(nWidth);
            pWMF->ReadUInt16(nHeight);

            if (nWidth > 0)
                aLineInfo.SetWidth(nWidth);

            bool bTransparent = false;

            switch( nStyle & 0xFF )
            {
                case PS_DASHDOTDOT :
                    aLineInfo.SetStyle( LineStyle::Dash );
                    aLineInfo.SetDashCount( 1 );
                    aLineInfo.SetDotCount( 2 );
                break;
                case PS_DASHDOT :
                    aLineInfo.SetStyle( LineStyle::Dash );
                    aLineInfo.SetDashCount( 1 );
                    aLineInfo.SetDotCount( 1 );
                break;
                case PS_DOT :
                    aLineInfo.SetStyle( LineStyle::Dash );
                    aLineInfo.SetDashCount( 0 );
                    aLineInfo.SetDotCount( 1 );
                break;
                case PS_DASH :
                    aLineInfo.SetStyle( LineStyle::Dash );
                    aLineInfo.SetDashCount( 1 );
                    aLineInfo.SetDotCount( 0 );
                break;
                case PS_NULL :
                    bTransparent = true;
                    aLineInfo.SetStyle( LineStyle::NONE );
                break;
                default :
                case PS_INSIDEFRAME :
                case PS_SOLID :
                    aLineInfo.SetStyle( LineStyle::Solid );
            }
            switch( nStyle & 0xF00 )
            {
                case PS_ENDCAP_ROUND :
                    aLineInfo.SetLineCap( css::drawing::LineCap_ROUND );
                break;
                case PS_ENDCAP_SQUARE :
                    aLineInfo.SetLineCap( css::drawing::LineCap_SQUARE );
                break;
                case PS_ENDCAP_FLAT :
                default :
                    aLineInfo.SetLineCap( css::drawing::LineCap_BUTT );
            }
            switch( nStyle & 0xF000 )
            {
                case PS_JOIN_ROUND :
                    aLineInfo.SetLineJoin ( basegfx::B2DLineJoin::Round );
                break;
                case PS_JOIN_MITER :
                    aLineInfo.SetLineJoin ( basegfx::B2DLineJoin::Miter );
                break;
                case PS_JOIN_BEVEL :
                    aLineInfo.SetLineJoin ( basegfx::B2DLineJoin::Bevel );
                break;
                default :
                    aLineInfo.SetLineJoin ( basegfx::B2DLineJoin::NONE );
            }
            pOut->CreateObject(o3tl::make_unique<WinMtfLineStyle>( ReadColor(), aLineInfo, bTransparent ));
        }
        break;

        case W_META_CREATEBRUSHINDIRECT:
        {
            sal_uInt16  nStyle = 0;
            pWMF->ReadUInt16( nStyle );
            pOut->CreateObject(o3tl::make_unique<WinMtfFillStyle>( ReadColor(), ( nStyle == BS_HOLLOW ) ));
        }
        break;

        case W_META_CREATEFONTINDIRECT:
        {
            Size aFontSize;
            char lfFaceName[LF_FACESIZE+1];
            sal_Int16 lfEscapement = 0;
            sal_Int16 lfOrientation = 0;
            sal_Int16 lfWeight = 0;

            LOGFONTW aLogFont;
            unsigned char nTmp;
            aFontSize = ReadYXExt();
            pWMF->ReadInt16( lfEscapement );
            pWMF->ReadInt16( lfOrientation );
            pWMF->ReadInt16( lfWeight );
            pWMF->ReadUChar( aLogFont.lfItalic );
            pWMF->ReadUChar( aLogFont.lfUnderline );
            pWMF->ReadUChar( aLogFont.lfStrikeOut );
            pWMF->ReadUChar( aLogFont.lfCharSet );
            pWMF->ReadUChar( nTmp ); // lfOutPrecision
            pWMF->ReadUChar( nTmp ); // lfClipPrecision
            pWMF->ReadUChar( nTmp ); // lfQuality
            pWMF->ReadUChar( aLogFont.lfPitchAndFamily );
            size_t nRet = pWMF->ReadBytes( lfFaceName, LF_FACESIZE );
            lfFaceName[nRet] = 0;
            aLogFont.lfWidth = aFontSize.Width();
            aLogFont.lfHeight = aFontSize.Height();
            aLogFont.lfEscapement = lfEscapement;
            aLogFont.lfWeight = lfWeight;

            rtl_TextEncoding eCharSet;
            if ( ( aLogFont.lfCharSet == OEM_CHARSET ) || ( aLogFont.lfCharSet == DEFAULT_CHARSET ) )
                eCharSet = osl_getThreadTextEncoding();
            else
                eCharSet = rtl_getTextEncodingFromWindowsCharset( aLogFont.lfCharSet );
            if ( eCharSet == RTL_TEXTENCODING_DONTKNOW )
                eCharSet = osl_getThreadTextEncoding();
            if ( eCharSet == RTL_TEXTENCODING_SYMBOL )
                eCharSet = RTL_TEXTENCODING_MS_1252;
            aLogFont.alfFaceName = OUString( lfFaceName, strlen(lfFaceName), eCharSet );

            pOut->CreateObject(o3tl::make_unique<WinMtfFontStyle>( aLogFont ));
        }
        break;

        case W_META_CREATEBITMAPINDIRECT:
        {
            pOut->CreateObject();
        }
        break;

        case W_META_CREATEBITMAP:
        {
            pOut->CreateObject();
        }
        break;

        case W_META_CREATEREGION:
        {
            pOut->CreateObject();
        }
        break;

        case W_META_EXCLUDECLIPRECT :
        {
            pOut->ExcludeClipRect( ReadRectangle() );
        }
        break;

        case W_META_PATBLT:
        {
            sal_uInt32 nROP = 0;
            WMFRasterOp nOldROP = WMFRasterOp::NONE;
            pWMF->ReadUInt32( nROP );
            Size aSize = ReadYXExt();
            nOldROP = pOut->SetRasterOp( (WMFRasterOp)nROP );
            pOut->DrawRect( tools::Rectangle( ReadYX(), aSize ), false );
            pOut->SetRasterOp( nOldROP );
        }
        break;

        case W_META_SELECTCLIPREGION:
        {
            sal_Int16 nObjIndex = 0;
            pWMF->ReadInt16( nObjIndex );
            if ( !nObjIndex )
            {
                tools::PolyPolygon aEmptyPolyPoly;
                pOut->SetClipPath( aEmptyPolyPoly, RGN_COPY, true );
            }
        }
        break;

        case W_META_ESCAPE :
        {
            // nRecSize has been checked previously to be greater than 3
            sal_uInt64 nMetaRecSize = static_cast< sal_uInt64 >( nRecSize - 2 ) * 2;
            sal_uInt64 nMetaRecEndPos = pWMF->Tell() + nMetaRecSize;

            // taking care that nRecSize does not exceed the maximal stream position
            if ( nMetaRecEndPos > nEndPos )
            {
                pWMF->SetError( SVSTREAM_FILEFORMAT_ERROR );
                break;
            }
            if ( nRecSize >= 4 )    // minimal escape length
            {
                sal_uInt16  nMode = 0, nLen = 0;
                pWMF->ReadUInt16( nMode )
                     .ReadUInt16( nLen );
                if ( ( nMode == W_MFCOMMENT ) && ( nLen >= 4 ) )
                {
                    sal_uInt32 nNewMagic = 0; // we have to read int32 for
                    pWMF->ReadUInt32( nNewMagic );   // META_ESCAPE_ENHANCED_METAFILE CommentIdentifier

                    if( nNewMagic == 0x2c2a4f4f &&  nLen >= 14 )
                    {
                        sal_uInt16 nMagic2 = 0;
                        pWMF->ReadUInt16( nMagic2 );
                        if( nMagic2 == 0x0a ) // 2nd half of magic
                        {                     // continue with private escape
                            sal_uInt32 nCheck = 0, nEsc = 0;
                            pWMF->ReadUInt32( nCheck )
                                 .ReadUInt32( nEsc );

                            sal_uInt32 nEscLen = nLen - 14;
                            if ( nEscLen <= ( nRecSize * 2 ) )
                            {
#ifdef OSL_BIGENDIAN
                                sal_uInt32 nTmp = OSL_SWAPDWORD( nEsc );
                                sal_uInt32 nCheckSum = rtl_crc32( 0, &nTmp, 4 );
#else
                                sal_uInt32 nCheckSum = rtl_crc32( 0, &nEsc, 4 );
#endif
                                std::unique_ptr<sal_Int8[]> pData;

                                if ( ( static_cast< sal_uInt64 >( nEscLen ) + pWMF->Tell() ) > nMetaRecEndPos )
                                {
                                    pWMF->SetError( SVSTREAM_FILEFORMAT_ERROR );
                                    break;
                                }
                                if ( nEscLen > 0 )
                                {
                                    pData.reset(new sal_Int8[ nEscLen ]);
                                    pWMF->ReadBytes(pData.get(), nEscLen);
                                    nCheckSum = rtl_crc32( nCheckSum, pData.get(), nEscLen );
                                }
                                if ( nCheck == nCheckSum )
                                {
                                    switch( nEsc )
                                    {
                                        case PRIVATE_ESCAPE_UNICODE :
                                        {
                                            // we will use text instead of polygons only if we have the correct font
                                            if ( Application::GetDefaultDevice()->IsFontAvailable( pOut->GetFont().GetFamilyName() ) )
                                            {
                                                Point  aPt;
                                                OUString aString;
                                                sal_uInt32  nStringLen, nDXCount;
                                                std::unique_ptr<long[]> pDXAry;
                                                SvMemoryStream aMemoryStream( nEscLen );
                                                aMemoryStream.WriteBytes(pData.get(), nEscLen);
                                                aMemoryStream.Seek( STREAM_SEEK_TO_BEGIN );
                                                sal_Int32 nTmpX(0), nTmpY(0);
                                                aMemoryStream.ReadInt32( nTmpX )
                                                             .ReadInt32( nTmpY )
                                                             .ReadUInt32( nStringLen );
                                                 aPt.X() = nTmpX;
                                                 aPt.Y() = nTmpY;

                                                if ( ( static_cast< sal_uInt64 >( nStringLen ) * sizeof( sal_Unicode ) ) < ( nEscLen - aMemoryStream.Tell() ) )
                                                {

                                                    aString = read_uInt16s_ToOUString(aMemoryStream, nStringLen);
                                                    aMemoryStream.ReadUInt32( nDXCount );
                                                    if ( ( static_cast< sal_uInt64 >( nDXCount ) * sizeof( sal_Int32 ) ) >= ( nEscLen - aMemoryStream.Tell() ) )
                                                        nDXCount = 0;
                                                    if ( nDXCount )
                                                        pDXAry.reset(new long[ nDXCount ]);
                                                    for  (sal_uInt32 i = 0; i < nDXCount; i++ )
                                                    {
                                                        sal_Int32 val;
                                                        aMemoryStream.ReadInt32( val);
                                                        pDXAry[ i ] = val;
                                                    }
                                                    aMemoryStream.ReadUInt32( nSkipActions );
                                                    pOut->DrawText( aPt, aString, pDXAry.get() );
                                                }
                                            }
                                        }
                                        break;
                                    }
                                }
                            }
                        }
                    }
                    else if ( (nNewMagic == static_cast< sal_uInt32 >(0x43464D57)) && (nLen >= 34) && ( (sal_Int32)(nLen + 10) <= (sal_Int32)(nRecSize * 2) ))
                    {
                        sal_uInt32 nComType = 0, nVersion = 0, nFlags = 0, nComRecCount = 0,
                                   nCurRecSize = 0, nRemainingSize = 0, nEMFTotalSize = 0;
                        sal_uInt16 nCheck = 0;

                        pWMF->ReadUInt32( nComType ).ReadUInt32( nVersion ).ReadUInt16( nCheck ).ReadUInt32( nFlags )
                             .ReadUInt32( nComRecCount ).ReadUInt32( nCurRecSize )
                             .ReadUInt32( nRemainingSize ).ReadUInt32( nEMFTotalSize ); // the nRemainingSize is not mentioned in MSDN documentation
                                                                  // but it seems to be required to read in data produced by OLE

                        if( nComType == 0x01 && nVersion == 0x10000 && nComRecCount )
                        {
                            if( !nEMFRec )
                            {   // first EMF comment
                                nEMFRecCount    = nComRecCount;
                                nEMFSize        = nEMFTotalSize;
                                if (nEMFSize > pWMF->remainingSize())
                                {
                                    SAL_WARN("vcl.wmf", "emf size claims to be larger than remaining data");
                                    pEMFStream.reset();
                                }
                                else
                                    pEMFStream = o3tl::make_unique<SvMemoryStream>(nEMFSize, 0);
                            }
                            else if( ( nEMFRecCount != nComRecCount ) || ( nEMFSize != nEMFTotalSize ) ) // add additional checks here
                            {
                                // total records should be the same as in previous comments
                                nEMFRecCount = 0xFFFFFFFF;
                                pEMFStream.reset();
                            }
                            nEMFRec++;

                            if (pEMFStream && nCurRecSize + 34 > nLen)
                            {
                                nEMFRecCount = 0xFFFFFFFF;
                                pEMFStream.reset();
                            }

                            if (pEMFStream && nCurRecSize > pWMF->remainingSize())
                            {
                                SAL_WARN("vcl.wmf", "emf record size claims to be larger than remaining data");
                                nEMFRecCount = 0xFFFFFFFF;
                                pEMFStream.reset();
                            }

                            if (pEMFStream)
                            {
                                std::vector<sal_Int8> aBuf(nCurRecSize);
                                sal_uInt32 nCount = pWMF->ReadBytes(aBuf.data(), nCurRecSize);
                                if( nCount == nCurRecSize )
                                    pEMFStream->WriteBytes(aBuf.data(), nCount);
                            }
                        }
                    }
                }
            }
        }
        break;

        case W_META_SETRELABS:
        case W_META_SETPOLYFILLMODE:
        case W_META_SETSTRETCHBLTMODE:
        case W_META_SETTEXTCHAREXTRA:
        case W_META_SETTEXTJUSTIFICATION:
        case W_META_FLOODFILL :
        case W_META_FILLREGION:
        case W_META_FRAMEREGION:
        case W_META_INVERTREGION:
        case W_META_PAINTREGION:
        case W_META_DRAWTEXT:
        case W_META_SETMAPPERFLAGS:
        case W_META_SETDIBTODEV:
        case W_META_SELECTPALETTE:
        case W_META_REALIZEPALETTE:
        case W_META_ANIMATEPALETTE:
        case W_META_SETPALENTRIES:
        case W_META_RESIZEPALETTE:
        case W_META_EXTFLOODFILL:
        case W_META_RESETDC:
        case W_META_STARTDOC:
        case W_META_STARTPAGE:
        case W_META_ENDPAGE:
        case W_META_ABORTDOC:
        case W_META_ENDDOC:
        break;
    }
}

static const long   aMaxWidth = 1024;

bool WMFReader::ReadHeader()
{
    sal_uInt64 const nStrmPos = pWMF->Tell();

    sal_uInt32 nPlaceableMetaKey(0);
    // if available read the METAFILEHEADER
    pWMF->ReadUInt32( nPlaceableMetaKey );
    if (!pWMF->good())
        return false;

    tools::Rectangle aPlaceableBound;

    bool bPlaceable = nPlaceableMetaKey == 0x9ac6cdd7L;

    SAL_INFO("vcl.wmf", "Placeable: \"" << (bPlaceable ? "yes" : "no") << "\"");

    if (bPlaceable)
    {
        //TODO do some real error handling here
        sal_Int16 nVal;

        // Skip reserved bytes
        pWMF->SeekRel(2);

        // BoundRect
        pWMF->ReadInt16( nVal );
        aPlaceableBound.Left() = nVal;
        pWMF->ReadInt16( nVal );
        aPlaceableBound.Top() = nVal;
        pWMF->ReadInt16( nVal );
        aPlaceableBound.Right() = nVal;
        pWMF->ReadInt16( nVal );
        aPlaceableBound.Bottom() = nVal;

        // inch
        pWMF->ReadUInt16( nUnitsPerInch );

        // reserved
        pWMF->SeekRel( 4 );

        // Skip and don't check the checksum
        pWMF->SeekRel( 2 );
    }
    else
    {
        nUnitsPerInch = 96;


        if (   pExternalHeader != nullptr
            && pExternalHeader->xExt > 0
            && pExternalHeader->yExt > 0
            && (pExternalHeader->mapMode == MM_ISOTROPIC || pExternalHeader->mapMode == MM_ANISOTROPIC))
        {
            // #n417818#: If we have an external header then overwrite the bounds!
            tools::Rectangle aExtRect(0, 0,
                          (double) pExternalHeader->xExt * 567 * nUnitsPerInch / 1440000,
                          (double) pExternalHeader->yExt * 567 * nUnitsPerInch / 1440000);
            aPlaceableBound = aExtRect;

            SAL_INFO("vcl.wmf", "External header size "
                       " t: " << aPlaceableBound.Left()  << " l: " << aPlaceableBound.Top()
                    << " b: " << aPlaceableBound.Right() << " r: " << aPlaceableBound.Bottom());

            pOut->SetMapMode( pExternalHeader->mapMode );
        }
        else
        {
            pWMF->Seek( nStrmPos + 18 );    // set the streampos to the start of the metaactions
            GetPlaceableBound( aPlaceableBound, pWMF );

            // The image size is not known so normalize the calculated bounds so that the
            // resulting image is not too big
            const double fMaxWidth = static_cast<double>(aMaxWidth);
            if (aPlaceableBound.GetWidth() > aMaxWidth)
            {
                double fRatio = aPlaceableBound.GetWidth() / fMaxWidth;

                aPlaceableBound = tools::Rectangle(
                                    aPlaceableBound.Left()   / fRatio,
                                    aPlaceableBound.Top()    / fRatio,
                                    aPlaceableBound.Right()  / fRatio,
                                    aPlaceableBound.Bottom() / fRatio);

                SAL_INFO("vcl.wmf", "Placeable bounds "
                       " t: " << aPlaceableBound.Left()  << " l: " << aPlaceableBound.Top()
                    << " b: " << aPlaceableBound.Right() << " r: " << aPlaceableBound.Bottom());
            }
        }

        pWMF->Seek( nStrmPos );
    }

    pOut->SetWinOrg( aPlaceableBound.TopLeft() );
    Size aWMFSize( labs( aPlaceableBound.GetWidth() ), labs( aPlaceableBound.GetHeight() ) );
    pOut->SetWinExt( aWMFSize );

    SAL_INFO("vcl.wmf", "WMF size  w: " << aWMFSize.Width()    << " h: " << aWMFSize.Height());

    Size aDevExt( 10000, 10000 );
    if( ( labs( aWMFSize.Width() ) > 1 ) && ( labs( aWMFSize.Height() ) > 1 ) )
    {
        const Fraction  aFrac( 1, nUnitsPerInch );
        MapMode         aWMFMap( MapUnit::MapInch, Point(), aFrac, aFrac );
        Size            aSize100( OutputDevice::LogicToLogic( aWMFSize, aWMFMap, MapUnit::Map100thMM ) );
        aDevExt = Size( labs( aSize100.Width() ), labs( aSize100.Height() ) );
    }
    pOut->SetDevExt( aDevExt );

    SAL_INFO("vcl.wmf", "Dev size  w: " << aDevExt.Width()    << " h: " << aDevExt.Height());

    // read the METAHEADER
    sal_uInt32 nMetaKey(0);
    pWMF->ReadUInt32( nMetaKey ); // type and headersize
    if (!pWMF->good())
        return false;
    if (nMetaKey != 0x00090001)
    {
        sal_uInt16 aNextWord(0);
        pWMF->ReadUInt16( aNextWord );
        if (nMetaKey != 0x10000 || aNextWord != 0x09)
        {
            pWMF->SetError( SVSTREAM_FILEFORMAT_ERROR );
            return false;
        }
    }

    pWMF->SeekRel( 2 ); // Version (of Windows)
    pWMF->SeekRel( 4 ); // Size (of file in words)
    pWMF->SeekRel( 2 ); // NoObjects (maximum number of simultaneous objects)
    pWMF->SeekRel( 4 ); // MaxRecord (size of largest record in words)
    pWMF->SeekRel( 2 ); // NoParameters (Unused

    return pWMF->good();
}

void WMFReader::ReadWMF()
{
    sal_uInt16  nFunction;
    sal_uLong   nPos, nPercent, nLastPercent;

    nSkipActions = 0;

    pEMFStream.reset();
    nEMFRecCount    = 0;
    nEMFRec         = 0;
    nEMFSize        = 0;

    pOut->SetMapMode( MM_ANISOTROPIC );
    pOut->SetWinOrg( Point() );
    pOut->SetWinExt( Size( 1, 1 ) );
    pOut->SetDevExt( Size( 10000, 10000 ) );

    nEndPos=pWMF->Seek( STREAM_SEEK_TO_END );
    pWMF->Seek( nStartPos );
    Callback( (sal_uInt16) ( nLastPercent = 0 ) );

    if ( ReadHeader( ) )
    {
        nPos = pWMF->Tell();

        if( nEndPos - nStartPos )
        {
           bool bEMFAvailable = false;
            while( true )
            {
                nPercent = ( nPos - nStartPos ) * 100 / ( nEndPos - nStartPos );

                if( nLastPercent + 4 <= nPercent )
                {
                    Callback( (sal_uInt16) nPercent );
                    nLastPercent = nPercent;
                }
                pWMF->ReadUInt32( nRecSize ).ReadUInt16( nFunction );

                if(  pWMF->GetError()
                  || ( nRecSize < 3 )
                  || (  nRecSize  == 3
                     && nFunction == 0
                     )
                  || pWMF->IsEof()
                  )
                {
                    if( pWMF->IsEof() )
                        pWMF->SetError( SVSTREAM_FILEFORMAT_ERROR );

                    break;
                }
                if ( !bEMFAvailable )
                {
                    if(   !aBmpSaveList.empty()
                      && ( nFunction != W_META_STRETCHDIB    )
                      && ( nFunction != W_META_DIBBITBLT     )
                      && ( nFunction != W_META_DIBSTRETCHBLT )
                      )
                    {
                        pOut->ResolveBitmapActions( aBmpSaveList );
                    }

                    if ( !nSkipActions )
                        ReadRecordParams( nFunction );
                    else
                        nSkipActions--;

                    if( pEMFStream && nEMFRecCount == nEMFRec )
                    {
                        GDIMetaFile aMeta;
                        pEMFStream->Seek( 0 );
                        std::unique_ptr<EnhWMFReader> pEMFReader(o3tl::make_unique<EnhWMFReader>( *pEMFStream, aMeta ));
                        bEMFAvailable = pEMFReader->ReadEnhWMF();
                        pEMFReader.reset(); // destroy first!!!

                        if( bEMFAvailable )
                        {
                            pOut->AddFromGDIMetaFile( aMeta );
                            pOut->SetrclFrame( tools::Rectangle( Point(0, 0), aMeta.GetPrefSize()));

                            // the stream needs to be set to the wmf end position,
                            // otherwise the GfxLink that is created will be incorrect
                            // (leading to graphic loss after swapout/swapin).
                            // so we will proceed normally, but are ignoring further wmf
                            // records
                        }
                        else
                        {
                            // something went wrong
                            // continue with WMF, don't try this again
                            pEMFStream.reset();
                        }
                    }
                }
                const sal_uInt32 nAvailableBytes = nEndPos - nPos;
                const sal_uInt32 nMaxPossibleRecordSize = nAvailableBytes/2;
                if (nRecSize <= nMaxPossibleRecordSize)
                {
                    nPos += nRecSize * 2;
                    pWMF->Seek(nPos);
                }
                else
                    pWMF->SetError( SVSTREAM_FILEFORMAT_ERROR );
            }
        }
        else
            pWMF->SetError( SVSTREAM_GENERALERROR );

        if( !pWMF->GetError() && !aBmpSaveList.empty() )
            pOut->ResolveBitmapActions( aBmpSaveList );
    }
    if ( pWMF->GetError() )
        pWMF->Seek( nStartPos );
}

void WMFReader::GetPlaceableBound( tools::Rectangle& rPlaceableBound, SvStream* pStm )
{
    bool bRet = true;

    tools::Rectangle aBound;
    aBound.Left()   = RECT_MAX;
    aBound.Top()    = RECT_MAX;
    aBound.Right()  = RECT_MIN;
    aBound.Bottom() = RECT_MIN;
    bool bBoundsDetermined = false;

    sal_uInt32 nPos = pStm->Tell();
    sal_uInt32 nEnd = pStm->Seek( STREAM_SEEK_TO_END );

    pStm->Seek( nPos );

    Point aWinOrg(0,0);
    boost::optional<Size>  aWinExt;

    Point aViewportOrg(0,0);
    boost::optional<Size>  aViewportExt;

    if( nEnd - nPos )
    {
        sal_Int16 nMapMode = MM_ANISOTROPIC;
        sal_uInt16 nFunction;
        sal_uInt32 nRSize;

        while( bRet )
        {
            pStm->ReadUInt32( nRSize ).ReadUInt16( nFunction );

            if( pStm->GetError() )
            {
                bRet = false;
                break;
            }
            else if ( nRSize==3 && nFunction==0 )
            {
                break;
            }
            else if ( nRSize < 3 || pStm->IsEof() )
            {
                pStm->SetError( SVSTREAM_FILEFORMAT_ERROR );
                bRet = false;
                break;
            }
            switch( nFunction )
            {
                case W_META_SETWINDOWORG:
                {
                    aWinOrg = ReadYX();
                }
                break;

                case W_META_SETWINDOWEXT:
                {
                    sal_Int16 nWidth(0), nHeight(0);
                    pStm->ReadInt16(nHeight);
                    pStm->ReadInt16(nWidth);
                    aWinExt = Size(nWidth, nHeight);
                }
                break;

                case W_META_SETVIEWPORTORG:
                {
                    aViewportOrg = ReadYX();
                }
                break;

                case W_META_SETVIEWPORTEXT:
                {
                    sal_Int16 nWidth(0), nHeight(0);
                    pStm->ReadInt16(nHeight);
                    pStm->ReadInt16(nWidth);
                    aViewportExt = Size(nWidth, nHeight);
                }
                break;

                case W_META_SETMAPMODE :
                    pStm->ReadInt16( nMapMode );
                break;

                case W_META_MOVETO:
                case W_META_LINETO:
                    GetWinExtMax( ReadYX(), aBound, nMapMode );
                    bBoundsDetermined = true;
                break;

                case W_META_RECTANGLE:
                case W_META_INTERSECTCLIPRECT:
                case W_META_EXCLUDECLIPRECT :
                case W_META_ELLIPSE:
                    GetWinExtMax( ReadRectangle(), aBound, nMapMode );
                    bBoundsDetermined = true;
                break;

                case W_META_ROUNDRECT:
                    ReadYXExt(); // size
                    GetWinExtMax( ReadRectangle(), aBound, nMapMode );
                    bBoundsDetermined = true;
                break;

                case W_META_ARC:
                case W_META_PIE:
                case W_META_CHORD:
                    ReadYX(); // end
                    ReadYX(); // start
                    GetWinExtMax( ReadRectangle(), aBound, nMapMode );
                    bBoundsDetermined = true;
                break;

                case W_META_POLYGON:
                {
                    bool bRecordOk = true;

                    sal_uInt16 nPoints(0);
                    pStm->ReadUInt16( nPoints );

                    if (nPoints > pStm->remainingSize() / (2 * sizeof(sal_uInt16)))
                    {
                        bRecordOk = false;
                    }
                    else
                    {
                        for(sal_uInt16 i = 0; i < nPoints; i++ )
                        {
                            GetWinExtMax( ReadPoint(), aBound, nMapMode );
                            bBoundsDetermined = true;
                        }
                    }

                    SAL_WARN_IF(!bRecordOk, "vcl.wmf", "polyline record claimed more points than the stream can provide");

                    if (!bRecordOk)
                    {
                        pStm->SetError( SVSTREAM_FILEFORMAT_ERROR );
                        bRet = false;
                        break;
                    }
                }
                break;

                case W_META_POLYPOLYGON:
                {
                    bool bRecordOk = true;
                    sal_uInt16 nPoly(0), nPoints(0);
                    pStm->ReadUInt16(nPoly);
                    if (nPoly > pStm->remainingSize() / sizeof(sal_uInt16))
                    {
                        bRecordOk = false;
                    }
                    else
                    {
                        for(sal_uInt16 i = 0; i < nPoly; i++ )
                        {
                            sal_uInt16 nP = 0;
                            pStm->ReadUInt16( nP );
                            if (nP > SAL_MAX_UINT16 - nPoints)
                            {
                                bRecordOk = false;
                                break;
                            }
                            nPoints += nP;
                        }
                    }

                    SAL_WARN_IF(!bRecordOk, "vcl.wmf", "polypolygon record has more polygons than we can handle");

                    bRecordOk = bRecordOk && pStm->good();

                    if (!bRecordOk)
                    {
                        pStm->SetError( SVSTREAM_FILEFORMAT_ERROR );
                        bRet = false;
                        break;
                    }

                    if (nPoints > pStm->remainingSize() / (2 * sizeof(sal_uInt16)))
                    {
                        bRecordOk = false;
                    }
                    else
                    {
                        for (sal_uInt16 i = 0; i < nPoints; i++ )
                        {
                            GetWinExtMax( ReadPoint(), aBound, nMapMode );
                            bBoundsDetermined = true;
                        }
                    }

                    SAL_WARN_IF(!bRecordOk, "vcl.wmf", "polypolygon record claimed more points than the stream can provide");

                    bRecordOk &= pStm->good();

                    if (!bRecordOk)
                    {
                        pStm->SetError( SVSTREAM_FILEFORMAT_ERROR );
                        bRet = false;
                        break;
                    }
                }
                break;

                case W_META_POLYLINE:
                {
                    bool bRecordOk = true;

                    sal_uInt16 nPoints(0);
                    pStm->ReadUInt16(nPoints);
                    if (nPoints > pStm->remainingSize() / (2 * sizeof(sal_uInt16)))
                    {
                        bRecordOk = false;
                    }
                    else
                    {
                        for (sal_uInt16 i = 0; i < nPoints; ++i)
                        {
                            GetWinExtMax( ReadPoint(), aBound, nMapMode );
                            bBoundsDetermined = true;
                        }
                    }

                    SAL_WARN_IF(!bRecordOk, "vcl.wmf", "polyline record claimed more points than the stream can provide");

                    if (!bRecordOk)
                    {
                        pStm->SetError( SVSTREAM_FILEFORMAT_ERROR );
                        bRet = false;
                        break;
                    }
                }
                break;

                case W_META_SETPIXEL:
                {
                    ReadColor();
                    GetWinExtMax( ReadYX(), aBound, nMapMode );
                    bBoundsDetermined = true;
                }
                break;

                case W_META_TEXTOUT:
                {
                    sal_uInt16 nLength;
                    pStm->ReadUInt16( nLength );
                    // todo: we also have to take care of the text width
                    if ( nLength )
                    {
                        pStm->SeekRel( ( nLength + 1 ) &~ 1 );
                        GetWinExtMax( ReadYX(), aBound, nMapMode );
                        bBoundsDetermined = true;
                    }
                }
                break;

                case W_META_EXTTEXTOUT:
                {
                    sal_uInt16  nLen, nOptions;
                    Point       aPosition;

                    aPosition = ReadYX();
                    pStm->ReadUInt16( nLen ).ReadUInt16( nOptions );
                    // todo: we also have to take care of the text width
                    if( nLen )
                    {
                        GetWinExtMax( aPosition, aBound, nMapMode );
                        bBoundsDetermined = true;
                    }
                }
                break;
                case W_META_BITBLT:
                case W_META_STRETCHBLT:
                case W_META_DIBBITBLT:
                case W_META_DIBSTRETCHBLT:
                case W_META_STRETCHDIB:
                {
                    sal_Int32   nWinROP;
                    sal_uInt16  nSx, nSy, nUsage;
                    pStm->ReadInt32( nWinROP );

                    if( nFunction == W_META_STRETCHDIB )
                        pStm->ReadUInt16( nUsage );

                    // nSye and nSxe is the number of pixels that has to been used
                    if( nFunction == W_META_STRETCHDIB || nFunction == W_META_STRETCHBLT || nFunction == W_META_DIBSTRETCHBLT )
                    {
                        sal_uInt16 nSxe, nSye;
                        pStm->ReadUInt16( nSye ).ReadUInt16( nSxe );
                    }

                    // nSy and nx is the offset of the first pixel
                    pStm->ReadUInt16( nSy ).ReadUInt16( nSx );

                    if( nFunction == W_META_STRETCHDIB || nFunction == W_META_DIBBITBLT || nFunction == W_META_DIBSTRETCHBLT )
                    {
                        if ( nWinROP == PATCOPY )
                            pStm->ReadUInt16( nUsage );    // i don't know anything of this parameter, so its called nUsage
                                                // pOut->DrawRect( Rectangle( ReadYX(), aDestSize ), false );

                        Size aDestSize( ReadYXExt() );
                        if ( aDestSize.Width() && aDestSize.Height() )  // #92623# do not try to read buggy bitmaps
                        {
                            tools::Rectangle aDestRect( ReadYX(), aDestSize );
                            GetWinExtMax( aDestRect, aBound, nMapMode );
                            bBoundsDetermined = true;
                        }
                    }
                }
                break;

                case W_META_PATBLT:
                {
                    sal_uInt32 nROP;
                    pStm->ReadUInt32( nROP );
                    Size aSize = ReadYXExt();
                    GetWinExtMax( tools::Rectangle( ReadYX(), aSize ), aBound, nMapMode );
                    bBoundsDetermined = true;
                }
                break;
            }

            const sal_uInt32 nAvailableBytes = nEnd - nPos;
            const sal_uInt32 nMaxPossibleRecordSize = nAvailableBytes/2;
            if (nRSize <= nMaxPossibleRecordSize)
            {
                nPos += nRSize * 2;
                pStm->Seek( nPos );
            }
            else
            {
                pStm->SetError( SVSTREAM_FILEFORMAT_ERROR );
                bRet = false;
            }
        }
    }
    else
    {
        pStm->SetError( SVSTREAM_GENERALERROR );
        bRet = false;
    }

    if (bRet)
    {
        if (aWinExt)
        {
            rPlaceableBound = tools::Rectangle(aWinOrg, *aWinExt);
            SAL_INFO("vcl.wmf", "Window dimension "
                       " t: " << rPlaceableBound.Left()  << " l: " << rPlaceableBound.Top()
                    << " b: " << rPlaceableBound.Right() << " r: " << rPlaceableBound.Bottom());
        }
        else if (aViewportExt)
        {
            rPlaceableBound = tools::Rectangle(aViewportOrg, *aViewportExt);
            SAL_INFO("vcl.wmf", "Viewport dimension "
                       " t: " << rPlaceableBound.Left()  << " l: " << rPlaceableBound.Top()
                    << " b: " << rPlaceableBound.Right() << " r: " << rPlaceableBound.Bottom());
        }
        else if (bBoundsDetermined)
        {
            rPlaceableBound = aBound;
            SAL_INFO("vcl.wmf", "Determined dimension "
                       " t: " << rPlaceableBound.Left()  << " l: " << rPlaceableBound.Top()
                    << " b: " << rPlaceableBound.Right() << " r: " << rPlaceableBound.Bottom());
        }
        else
        {
            rPlaceableBound.Left() = 0;
            rPlaceableBound.Top() = 0;
            rPlaceableBound.Right() = aMaxWidth;
            rPlaceableBound.Bottom() = aMaxWidth;
            SAL_INFO("vcl.wmf", "Default dimension "
                       " t: " << rPlaceableBound.Left()  << " l: " << rPlaceableBound.Top()
                    << " b: " << rPlaceableBound.Right() << " r: " << rPlaceableBound.Bottom());
        }
    }
}

WMFReader::WMFReader(SvStream& rStreamWMF, GDIMetaFile& rGDIMetaFile,
                     FilterConfigItem* pConfigItem, WMF_EXTERNALHEADER* pExtHeader)
    : WinMtf(rGDIMetaFile, rStreamWMF, pConfigItem)
    , nUnitsPerInch(96)
    , nRecSize(0)
    , nEMFRecCount(0)
    , nEMFRec(0)
    , nEMFSize(0)
    , nSkipActions(0)
    , pExternalHeader(pExtHeader)
{}

/* vim:set shiftwidth=4 softtabstop=4 expandtab: */