When checking for a label cache image, we only look for those which

would be drawn between 30% and 300% of their original image size We don't want to draw massive pixelated labels on top of everything else, and we also don't need to draw tiny unreadable labels... better to draw nothing in this case and wait till the updated label results are ready!
qgis · Jan 28, 2021 · a290537 · a290537
1 parent 339516a
commit a290537
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/src/core/qgsmaprendererjob.cpp b/src/core/qgsmaprendererjob.cpp
@@ -819,7 +819,10 @@ QImage QgsMapRendererJob::composeImage(
     painter.setOpacity( 1.0 );
     painter.drawImage( 0, 0, *labelJob.img );
   }
-  else if ( cache && cache->hasAnyCacheImage( LABEL_PREVIEW_CACHE_ID ) )
+  // when checking for a label cache image, we only look for those which would be drawn between 30% and 300% of the
+  // original size. We don't want to draw massive pixelated labels on top of everything else, and we also don't need
+  // to draw tiny unreadable labels... better to draw nothing in this case and wait till the updated label results are ready!
+  else if ( cache && cache->hasAnyCacheImage( LABEL_PREVIEW_CACHE_ID, 0.3, 3 ) )
   {
     const QImage labelCacheImage = cache->transformedCacheImage( LABEL_PREVIEW_CACHE_ID, settings.mapToPixel() );
     painter.setCompositionMode( QPainter::CompositionMode_SourceOver );