fdo#45779 avoiding creation of inconsistent B2DPolygon

this avoid the root cause of this bug, avoiding creating a
B2DPlygon which contains no points.

It seems the code relies somehow on an null B2DPolyPolygon, hence the
change done here. Better would be to have time to look how to remove
this fact. But currently it seems the code relies on  a
rSet.Put( XLineStartItem( aArrowName, aPolyPoly) where aPolyPoly is
not defined in certain cases.

Change-Id: I61b75d925090d1c9a0da96ce1a6eea50a2d60e5a

1 files changed, 14 insertions, 13 deletions

diff --git a/filter/source/msfilter/msdffimp.cxx b/filter/source/msfilter/msdffimp.cxx
index 80785fa3c050..5b6c86ccb21b 100644
--- a/filter/source/msfilter/msdffimp.cxx
+++ b/filter/source/msfilter/msdffimp.cxx
@@ -1099,12 +1099,13 @@ void SvxMSDffManager::SolveSolver( const SvxMSDffSolverContainer& rSolver )
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
-static basegfx::B2DPolygon GetLineArrow( const sal_Int32 nLineWidth, const MSO_LineEnd eLineEnd,
+static basegfx::B2DPolyPolygon GetLineArrow( const sal_Int32 nLineWidth, const MSO_LineEnd eLineEnd,
     const MSO_LineEndWidth eLineWidth, const MSO_LineEndLength eLineLenght,
     sal_Int32& rnArrowWidth, sal_Bool& rbArrowCenter,
     rtl::OUString& rsArrowName, sal_Bool bScaleArrow )
 {
-    basegfx::B2DPolygon aRetval;
+    basegfx::B2DPolyPolygon aRetPolyPoly;
+
     double      fLineWidth = nLineWidth < 70 ? 70.0 : nLineWidth;
     double      fLenghtMul, fWidthMul;
     sal_Int32   nLineNumber;
@@ -1140,7 +1141,7 @@ static basegfx::B2DPolygon GetLineArrow( const sal_Int32 nLineWidth, const MSO_L
             aTriangle.append(basegfx::B2DPoint( fWidthMul * fLineWidth, fLenghtMul * fLineWidth ));
             aTriangle.append(basegfx::B2DPoint( 0.0, fLenghtMul * fLineWidth ));
             aTriangle.setClosed(true);
-            aRetval = aTriangle;
+            aRetPolyPoly = basegfx::B2DPolyPolygon(aTriangle);
             aArrowName.appendAscii(RTL_CONSTASCII_STRINGPARAM("msArrowEnd "));
         }
         break;
@@ -1169,7 +1170,7 @@ static basegfx::B2DPolygon GetLineArrow( const sal_Int32 nLineWidth, const MSO_L
             aTriangle.append(basegfx::B2DPoint( fWidthMul * fLineWidth * 0.15, fLenghtMul * fLineWidth ));
             aTriangle.append(basegfx::B2DPoint( 0.0, fLenghtMul * fLineWidth * 0.91 ));
             aTriangle.setClosed(true);
-            aRetval = aTriangle;
+            aRetPolyPoly = basegfx::B2DPolyPolygon(aTriangle);
             aArrowName.appendAscii(RTL_CONSTASCII_STRINGPARAM("msArrowOpenEnd "));
         }
         break;
@@ -1181,7 +1182,7 @@ static basegfx::B2DPolygon GetLineArrow( const sal_Int32 nLineWidth, const MSO_L
             aTriangle.append(basegfx::B2DPoint( fWidthMul * fLineWidth * 0.50 , fLenghtMul * fLineWidth * 0.60 ));
             aTriangle.append(basegfx::B2DPoint( 0.0, fLenghtMul * fLineWidth ));
             aTriangle.setClosed(true);
-            aRetval = aTriangle;
+            aRetPolyPoly = basegfx::B2DPolyPolygon(aTriangle);
             aArrowName.appendAscii(RTL_CONSTASCII_STRINGPARAM("msArrowStealthEnd "));
         }
         break;
@@ -1193,16 +1194,16 @@ static basegfx::B2DPolygon GetLineArrow( const sal_Int32 nLineWidth, const MSO_L
             aTriangle.append(basegfx::B2DPoint( fWidthMul * fLineWidth * 0.50 , fLenghtMul * fLineWidth ));
             aTriangle.append(basegfx::B2DPoint( 0.0, fLenghtMul * fLineWidth * 0.50 ));
             aTriangle.setClosed(true);
-            aRetval = aTriangle;
+            aRetPolyPoly = basegfx::B2DPolyPolygon(aTriangle);
             rbArrowCenter = sal_True;
             aArrowName.appendAscii(RTL_CONSTASCII_STRINGPARAM("msArrowDiamondEnd "));
         }
         break;
         case mso_lineArrowOvalEnd :
         {
-            aRetval = XPolygon( Point( (sal_Int32)( fWidthMul * fLineWidth * 0.50 ), 0 ),
+            aRetPolyPoly = basegfx::B2DPolyPolygon( XPolygon( Point( (sal_Int32)( fWidthMul * fLineWidth * 0.50 ), 0 ),
                                 (sal_Int32)( fWidthMul * fLineWidth * 0.50 ),
-                                    (sal_Int32)( fLenghtMul * fLineWidth * 0.50 ), 0, 3600 ).getB2DPolygon();
+                                    (sal_Int32)( fLenghtMul * fLineWidth * 0.50 ), 0, 3600 ).getB2DPolygon() );
             rbArrowCenter = sal_True;
             aArrowName.appendAscii(RTL_CONSTASCII_STRINGPARAM("msArrowOvalEnd "));
         }
@@ -1213,7 +1214,7 @@ static basegfx::B2DPolygon GetLineArrow( const sal_Int32 nLineWidth, const MSO_L
     rsArrowName = aArrowName.makeStringAndClear();
     rnArrowWidth = (sal_Int32)( fLineWidth * fWidthMul );
 
-    return aRetval;
+    return aRetPolyPoly;
 }
 
 void DffPropertyReader::ApplyLineAttributes( SfxItemSet& rSet, const MSO_SPT eShapeType ) const // #i28269#
@@ -1335,10 +1336,10 @@ void DffPropertyReader::ApplyLineAttributes( SfxItemSet& rSet, const MSO_SPT eSh
                 sal_Int32   nArrowWidth;
                 sal_Bool    bArrowCenter;
                 rtl::OUString aArrowName;
-                basegfx::B2DPolygon aPoly(GetLineArrow( nLineWidth, eLineEnd, eWidth, eLenght, nArrowWidth, bArrowCenter, aArrowName, bScaleArrows ));
+                basegfx::B2DPolyPolygon aPolyPoly(GetLineArrow( nLineWidth, eLineEnd, eWidth, eLenght, nArrowWidth, bArrowCenter, aArrowName, bScaleArrows ));
 
                 rSet.Put( XLineStartWidthItem( nArrowWidth ) );
-                rSet.Put( XLineStartItem( aArrowName, basegfx::B2DPolyPolygon(aPoly) ) );
+                rSet.Put( XLineStartItem( aArrowName, aPolyPoly) );
                 rSet.Put( XLineStartCenterItem( bArrowCenter ) );
             }
             /////////////
@@ -1353,10 +1354,10 @@ void DffPropertyReader::ApplyLineAttributes( SfxItemSet& rSet, const MSO_SPT eSh
                 sal_Int32   nArrowWidth;
                 sal_Bool    bArrowCenter;
                 rtl::OUString aArrowName;
-                basegfx::B2DPolygon aPoly(GetLineArrow( nLineWidth, eLineEnd, eWidth, eLenght, nArrowWidth, bArrowCenter, aArrowName, bScaleArrows ));
+                basegfx::B2DPolyPolygon aPolyPoly(GetLineArrow( nLineWidth, eLineEnd, eWidth, eLenght, nArrowWidth, bArrowCenter, aArrowName, bScaleArrows ));
 
                 rSet.Put( XLineEndWidthItem( nArrowWidth ) );
-                rSet.Put( XLineEndItem( aArrowName, basegfx::B2DPolyPolygon(aPoly) ) );
+                rSet.Put( XLineEndItem( aArrowName, aPolyPoly ) );
                 rSet.Put( XLineEndCenterItem( bArrowCenter ) );
             }
             if ( IsProperty( DFF_Prop_lineEndCapStyle ) )