WMF tdf#142625 Refactor Bitmap records, to better handle missing features

Change-Id: If3334158e6e0ef9bc3aa33656ad0ee45cf460dbb
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/116827
Tested-by: Jenkins
Reviewed-by: Bartosz Kosiorek <gang65@poczta.onet.pl>

1 files changed, 34 insertions, 39 deletions

diff --git a/emfio/source/reader/wmfreader.cxx b/emfio/source/reader/wmfreader.cxx
index 73d059aa5df3..65c2cff1f465 100644
--- a/emfio/source/reader/wmfreader.cxx
+++ b/emfio/source/reader/wmfreader.cxx
@@ -803,14 +803,14 @@ namespace emfio
 
             case W_META_BITBLT:
             {
-                // 0-3   : nRasterOperation                      #93454#
+                // 0-3   : nRasterOperation        #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
+                // 8-9   : height of source and destination bitmap
+                // 10-11 : width  of source and destination bitmap
                 // 12-13 : destination position y (in pixel)
                 // 14-15 : destination position x (in pixel)
-                // 16-17 : don't know
+                // 16-17 : bitmap type
                 // 18-19 : Width Bitmap in Pixel
                 // 20-21 : Height Bitmap in Pixel
                 // 22-23 : bytes per scanline
@@ -818,26 +818,31 @@ namespace emfio
                 // 25    : bitcount
 
                 sal_uInt32  nRasterOperation = 0;
-                sal_uInt16  nYSrc = 0, nXSrc = 0, nSye = 0, nSxe = 0, nBitmapType = 0, nWidth = 0, nHeight = 0, nBytesPerScan = 0;
+                sal_Int16   nYSrc = 0, nXSrc = 0, nSye = 0, nSxe = 0, nBitmapType = 0, nWidth = 0, nHeight = 0, nBytesPerScan = 0;
                 sal_uInt8   nPlanes, nBitCount;
+                const bool bNoSourceBitmap = ( nRecordSize == ( static_cast< sal_uInt32 >( nFunc ) >> 8 ) + 3 );
 
                 mpInputStream->ReadUInt32( nRasterOperation );
-                SAL_WARN("emfio", "\t\t Raster operation: 0x" << std::hex << nRasterOperation << std::dec);
-                if ( nRecordSize == ( ( static_cast< sal_uInt32 >( nFunc ) >> 8 ) + 3 ) )
+                SAL_INFO("emfio", "\t\t Raster operation: 0x" << std::hex << nRasterOperation << std::dec << ", No source bitmap: " << bNoSourceBitmap);
+
+                mpInputStream->ReadInt16( nYSrc ).ReadInt16( nXSrc );
+                if ( bNoSourceBitmap )
+                    mpInputStream->SeekRel( 2 ); // Skip Reserved 2 bytes (it must be ignored)
+                mpInputStream->ReadInt16( nSye ).ReadInt16( nSxe );
+                Point aPoint( ReadYX() ); // The upper-left corner of the destination rectangle.
+                mpInputStream->ReadInt16( nBitmapType ).ReadInt16( nWidth ).ReadInt16( nHeight ).ReadInt16( nBytesPerScan ).ReadUChar( nPlanes ).ReadUChar( nBitCount );
+
+                SAL_INFO("emfio", "\t\t Bitmap type:" << nBitmapType << " Width:" << nWidth << " Height:" << nHeight << " WidthBytes:" << nBytesPerScan << " Planes: " << static_cast< sal_uInt16 >( nPlanes ) << " BitCount: " << static_cast< sal_uInt16 >( nBitCount ) );
+                if ( bNoSourceBitmap )
                 {
                     SAL_WARN("emfio", "\t\t TODO The unsupported Bitmap record (without embedded source Bitmap). Please fill a bug.");
                     break;
                 }
-                mpInputStream->ReadUInt16( nYSrc ).ReadUInt16( nXSrc ).ReadUInt16( nSye ).ReadUInt16( nSxe );
-                Point aPoint( ReadYX() ); // The upper-left corner of the destination rectangle.
-                mpInputStream->ReadUInt16( nBitmapType ).ReadUInt16( nWidth ).ReadUInt16( nHeight ).ReadUInt16( nBytesPerScan ).ReadUChar( nPlanes ).ReadUChar( nBitCount );
-
-                SAL_INFO("emfio", "\t\t Bitmap type:" << nBitmapType << " Width:" << nWidth << " Height:" << nHeight << " WidthBytes:" << nBytesPerScan);
                 bool bOk = nWidth && nHeight && nBytesPerScan > 0 && nPlanes == 1 && nBitCount == 1;
                 if (bOk)
                 {
                     // must be enough data to fulfil the request
-                    bOk = nBytesPerScan <= mpInputStream->remainingSize() / nHeight;
+                    bOk = o3tl::make_unsigned( nBytesPerScan ) <= mpInputStream->remainingSize() / nHeight;
                 }
                 if (bOk)
                 {
@@ -884,18 +889,13 @@ namespace emfio
             case W_META_STRETCHDIB:
             {
                 sal_uInt32  nRasterOperation = 0;
-                sal_Int16   nYSrc = 0, nXSrc = 0, nSrcHeight = 0, nSrcWidth = 0;
                 sal_uInt16  nColorUsage = 0;
+                sal_Int16   nSrcHeight = 0, nSrcWidth = 0, nYSrc = 0, nXSrc = 0;
                 Bitmap      aBmp;
+                const bool bNoSourceBitmap = ( nFunc != W_META_STRETCHDIB ) && ( nRecordSize == ( ( static_cast< sal_uInt32 >( nFunc ) >> 8 ) + 3 ) );
 
                 mpInputStream->ReadUInt32( nRasterOperation );
-                SAL_WARN("emfio", "\t\t Raster operation: 0x" << std::hex << nRasterOperation << std::dec);
-
-                if ( nRecordSize == ( ( static_cast< sal_uInt32 >( nFunc ) >> 8 ) + 3 ) )
-                {
-                    SAL_WARN("emfio", "\t\t TODO The unsupported Bitmap record (without embedded source Bitmap). Please fill a bug.");
-                    break;
-                }
+                SAL_INFO("emfio", "\t\t Raster operation: 0x" << std::hex << nRasterOperation << std::dec << ", No source bitmap: " << bNoSourceBitmap);
                 if( nFunc == W_META_STRETCHDIB )
                     mpInputStream->ReadUInt16( nColorUsage );
 
@@ -909,19 +909,19 @@ namespace emfio
                 // nYSrc and nXSrc is the offset of the first pixel
                 mpInputStream->ReadInt16( nYSrc ).ReadInt16( nXSrc );
 
+                // TODO Add META_STRETCHBLT support, which is defined by Bitmap16 Object
                 if( nFunc == W_META_DIBBITBLT ||
                     nFunc == W_META_DIBSTRETCHBLT ||
                     nFunc == W_META_STRETCHDIB )
                 {
-                    if ( nRasterOperation == PATCOPY )
-                        mpInputStream->ReadUInt16( nColorUsage );    // i don't know anything of this parameter, so it's called nUsage
-                                            // DrawRect( Rectangle( ReadYX(), aDestSize ), false );
+                    if ( bNoSourceBitmap )
+                        mpInputStream->SeekRel( 2 ); // Skip Reserved 2 bytes (it must be ignored)
 
                     Size aDestSize( ReadYXExt() );
                     if ( aDestSize.Width() && aDestSize.Height() )  // #92623# do not try to read buggy bitmaps
                     {
                         tools::Rectangle aDestRect( ReadYX(), aDestSize );
-                        if ( nRasterOperation != PATCOPY )
+                        if ( !bNoSourceBitmap )
                         {
                             // tdf#142625 Read the DIBHeader and check if bitmap is supported
                             // If bitmap is not supported don't run ReadDIB, as it will interrupt image processing
@@ -1943,7 +1943,6 @@ namespace emfio
                         if( nFunction == W_META_STRETCHDIB )
                             pStm->ReadUInt16( nColorUsage );
 
-                        // nSye and nSxe is the number of pixels that has to been used
                         if( nFunction == W_META_DIBSTRETCHBLT ||
                             nFunction == W_META_STRETCHBLT ||
                             nFunction == W_META_STRETCHDIB )
@@ -1955,20 +1954,16 @@ namespace emfio
                         // nYSrc and nXSrc is the offset of the first pixel
                         pStm->ReadInt16( nYSrc ).ReadInt16( nXSrc );
 
-                        if( nFunction == W_META_DIBBITBLT ||
-                            nFunction == W_META_DIBSTRETCHBLT )
-                        {
-                            if ( nRasterOperation == PATCOPY )
-                                pStm->ReadUInt16( nColorUsage );    // i don't know anything of this parameter, so it's called nUsage
-                                                    // DrawRect( Rectangle( ReadYX(), aDestSize ), false );
+                        const bool bNoSourceBitmap = ( nFunction != W_META_STRETCHDIB ) && ( nRSize == ( ( static_cast< sal_uInt32 >( nFunction ) >> 8 ) + 3 ) );
+                        if ( bNoSourceBitmap )
+                            mpInputStream->SeekRel( 2 ); // Skip Reserved 2 bytes (it must be ignored)
 
-                            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;
-                            }
+                        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;