VRT: complementary fix for refs #2018

OSGeo · Nov 15, 2019 · f80e9b8 · f80e9b8
1 parent 71ce9ef
commit f80e9b8
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Showing 2 changed files with 10 additions and 3 deletions.
diff --git a/gdal/frmts/vrt/vrtdataset.cpp b/gdal/frmts/vrt/vrtdataset.cpp
@@ -1784,7 +1784,8 @@ void VRTDataset::BuildVirtualOverviews()
         if( !EQUAL(poSource->GetType(), "SimpleSource") &&
             !EQUAL(poSource->GetType(), "ComplexSource") )
             return false;
-        GDALRasterBand* poSrcBand = poSource->GetBand();
+        GDALRasterBand* poSrcBand =
+            poBand->GetBand() == 0 ? poSource->GetMaskBandMainBand() : poSource->GetBand();
         if( poSrcBand == nullptr )
             return false;
 
@@ -1864,8 +1865,13 @@ void VRTDataset::BuildVirtualOverviews()
             }
             if( poNewSource )
             {
-                if( poNewSource->GetBand()->GetDataset() )
-                    poNewSource->GetBand()->GetDataset()->Reference();
+                auto poNewSourceBand = poBand->GetBand() == 0 ?
+                    poNewSource->GetMaskBandMainBand() :
+                    poNewSource->GetBand();
+                CPLAssert(poNewSourceBand);
+                auto poNewSourceBandDS = poNewSourceBand->GetDataset();
+                if( poNewSourceBandDS )
+                    poNewSourceBandDS->Reference();
                 poOvrVRTBand->AddSource(poNewSource);
             }
 

diff --git a/gdal/frmts/vrt/vrtdataset.h b/gdal/frmts/vrt/vrtdataset.h
@@ -924,6 +924,7 @@ class CPL_DLL VRTSimpleSource : public VRTSource
     virtual CPLErr FlushCache() override;
 
     GDALRasterBand* GetBand();
+    GDALRasterBand* GetMaskBandMainBand() { return m_poMaskBandMainBand; }
     int             IsSameExceptBandNumber( VRTSimpleSource* poOtherSource );
     CPLErr          DatasetRasterIO(
                                GDALDataType eBandDataType,