crashtesting avoid problematic scaling triggered by moz1545040-1.svg

Change-Id: I906891f8d01870bd13a98fc6720abb7ffaa9be1b
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/101189
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/vcl/source/gdi/gdimtf.cxx b/vcl/source/gdi/gdimtf.cxx
index 246b3c91f4de..22b516924b2b 100644
--- a/vcl/source/gdi/gdimtf.cxx
+++ b/vcl/source/gdi/gdimtf.cxx
@@ -2782,6 +2782,10 @@ bool GDIMetaFile::CreateThumbnail(BitmapEx& rBitmapEx, BmpConversion eColorConve
 {
     // initialization seems to be complicated but is used to avoid rounding errors
     ScopedVclPtrInstance< VirtualDevice > aVDev;
+    // set EnableB2dDraw to tease the rendering down the code paths which use B2DPolygon and
+    // avoid integer overflows on scaling tools::Polygon, e.g. moz1545040-1.svg
+    // note: this is similar to DocumentToGraphicRenderer::renderToGraphic
+    aVDev->SetAntialiasing(AntialiasingFlags::EnableB2dDraw | aVDev->GetAntialiasing());
     const Point     aNullPt;
     const Point     aTLPix( aVDev->LogicToPixel( aNullPt, GetPrefMapMode() ) );
     const Point     aBRPix( aVDev->LogicToPixel( Point( GetPrefSize().Width() - 1, GetPrefSize().Height() - 1 ), GetPrefMapMode() ) );