fix invalid use of rendering cache when map rotation is changed

qgis · Feb 9, 2021 · c6dcea7 · c6dcea7
1 parent 645397e
commit c6dcea7
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/src/core/qgsmaprenderercache.cpp b/src/core/qgsmaprenderercache.cpp
@@ -235,6 +235,11 @@ QImage QgsMapRendererCache::transformedCacheImage( const QString &cacheKey, cons
   }
   else
   {
+    // no not use cache when the canvas rotation just changed
+    // https://github.com/qgis/QGIS/issues/41360
+    if ( !qgsDoubleNear( mtp.mapRotation(), params.cachedMtp.mapRotation() ) )
+      return QImage();
+
     QgsRectangle intersection = mExtent.intersect( params.cachedExtent );
     if ( intersection.isNull() )
       return QImage();