tdf#137544 reserve space in polypolygon

Change-Id: Ic8dc5b7479c1353487bac883fc0e704356e90798
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/136802
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

basegfx/source/polygon/b2dpolypolygon.cxx

@@ -108,6 +108,11 @@ public:
         }
     }
 
+    void reserve(sal_uInt32 nCount)
+    {
+        maPolygons.reserve(nCount);
+    }
+
     void insert(sal_uInt32 nIndex, const basegfx::B2DPolyPolygon& rPolyPolygon)
     {
         // add nCount polygons from rPolyPolygon
@@ -288,6 +293,12 @@ public:
             mpPolyPolygon->insert(std::as_const(mpPolyPolygon)->count(), rPolygon, nCount);
     }
 
+    void B2DPolyPolygon::reserve(sal_uInt32 nCount)
+    {
+        if(nCount)
+            mpPolyPolygon->reserve(nCount);
+    }
+
     B2DPolyPolygon B2DPolyPolygon::getDefaultAdaptiveSubdivision() const
     {
         B2DPolyPolygon aRetval;

basegfx/source/polygon/b2dpolypolygontools.cxx

@@ -553,6 +553,7 @@ namespace basegfx::utils
             const css::drawing::PointSequenceSequence& rPointSequenceSequenceSource)
         {
             B2DPolyPolygon aRetval;
+            aRetval.reserve(rPointSequenceSequenceSource.getLength());
             const css::drawing::PointSequence* pPointSequence = rPointSequenceSequenceSource.getConstArray();
             const css::drawing::PointSequence* pPointSeqEnd = pPointSequence + rPointSequenceSequenceSource.getLength();
 

include/basegfx/polygon/b2dpolypolygon.hxx

@@ -68,6 +68,7 @@ namespace basegfx
         // insert/append single polygon
         void insert(sal_uInt32 nIndex, const B2DPolygon& rPolygon, sal_uInt32 nCount = 1);
         void append(const B2DPolygon& rPolygon, sal_uInt32 nCount = 1);
+        void reserve(sal_uInt32 nCount);
 
         /** Default adaptive subdivision access