thumbnails: Provide the size as a default parameter.

And increase it consistently to 256 pixels.

Change-Id: I123e11d597269d7e43298504f1dbd0098c9b0149

include/vcl/gdimtf.hxx

@@ -213,7 +213,8 @@ public:
     friend VCL_DLLPUBLIC SvStream& operator>>( SvStream& rIStm, GDIMetaFile& rGDIMetaFile );
     friend VCL_DLLPUBLIC SvStream& WriteGDIMetaFile( SvStream& rOStm, const GDIMetaFile& rGDIMetaFile );
 
-    sal_Bool        CreateThumbnail( sal_uInt32 nMaximumExtent, BitmapEx& rBmpEx, const BitmapEx* pOverlay = NULL, const Rectangle* pOverlayRect = NULL ) const;
+    /// Creates an antialiased thumbnail, with maximum height or width of nMaximumExtent.
+    sal_Bool        CreateThumbnail( BitmapEx& rBmpEx, sal_uInt32 nMaximumSize = 256, const BitmapEx* pOverlay = NULL, const Rectangle* pOverlayRect = NULL ) const;
 
     void            UseCanvas( sal_Bool _bUseCanvas );
     sal_Bool        GetUseCanvas() const { return bUseCanvas; }

sd/source/ui/unoidl/unopage.cxx

@@ -1111,8 +1111,7 @@ Any SAL_CALL SdGenericDrawPage::getPropertyValue( const OUString& PropertyName )
                     ::boost::shared_ptr<GDIMetaFile> pMetaFile =
                         pDocShell->GetPreviewMetaFile();
                     BitmapEx aBitmap;
-                    if ( pMetaFile && pMetaFile->CreateThumbnail( 160, /* magic value taken from GraphicHelper::getThumbnailFormatFromGDI_Impl() */
-                                                                  aBitmap ) )
+                    if (pMetaFile && pMetaFile->CreateThumbnail(aBitmap))
                     {
                         SvMemoryStream aMemStream;
                         WriteDIB(aBitmap.GetBitmap(), aMemStream, false, false);

sfx2/source/doc/docinf.cxx

@@ -306,8 +306,8 @@ uno::Sequence<sal_uInt8> SFX2_DLLPUBLIC convertMetaFile(GDIMetaFile* i_pThumb)
     if (i_pThumb) {
         BitmapEx aBitmap;
         SvMemoryStream aStream;
-// magic value 160 taken from GraphicHelper::getThumbnailFormatFromGDI_Impl()
-        if( i_pThumb->CreateThumbnail( 160, aBitmap ) ) {
+        if (i_pThumb->CreateThumbnail(aBitmap))
+        {
             WriteDIB(aBitmap.GetBitmap(), aStream, false, false);
             aStream.Seek(STREAM_SEEK_TO_END);
             uno::Sequence<sal_uInt8> aSeq(aStream.Tell());

sfx2/source/doc/graphhelp.cxx

@@ -283,7 +283,7 @@ sal_Bool GraphicHelper::getThumbnailFormatFromGDI_Impl( GDIMetaFile* pMetaFile,
         if ( bSigned )
             pSignatureBitmap = new BitmapEx( SfxResId( BMP_SIGNATURE ) );
 
-        bResult = pMetaFile->CreateThumbnail(THUMBNAIL_RESOLUTION, aResultBitmap, pSignatureBitmap);
+        bResult = pMetaFile->CreateThumbnail(aResultBitmap, THUMBNAIL_RESOLUTION, pSignatureBitmap);
 
         if ( bResult )
             bResult = ( !aResultBitmap.IsEmpty()

vcl/source/gdi/gdimtf.cxx

@@ -2869,10 +2869,8 @@ SvStream& GDIMetaFile::Write( SvStream& rOStm )
     return rOStm;
 }
 
-sal_Bool GDIMetaFile::CreateThumbnail( sal_uInt32 nMaximumExtent,
-                                    BitmapEx& rBmpEx,
-                                    const BitmapEx* pOverlay,
-                                    const Rectangle* pOverlayRect ) const
+sal_Bool GDIMetaFile::CreateThumbnail(BitmapEx& rBmpEx, sal_uInt32 nMaximumExtent,
+        const BitmapEx* pOverlay, const Rectangle* pOverlayRect) const
 {
     // initialization seems to be complicated but is used to avoid rounding errors
     VirtualDevice   aVDev;