only render when in extent

Author: PeterPetrik

src/core/mesh/qgsmeshlayerinterpolator.cpp

@@ -78,6 +78,9 @@ QgsRasterBlock *QgsMeshLayerInterpolator::block( int, const QgsRectangle &extent
     if ( feedback && feedback->isCanceled() )
       break;
 
+    if ( mContext.renderingStopped() )
+      break;
+
     const QgsMeshFace &face = triangles[i];
 
     const int v1 = face[0], v2 = face[1], v3 = face[2];

src/core/mesh/qgsmeshlayerrenderer.cpp

@@ -240,6 +240,7 @@ void QgsMeshLayerRenderer::renderMesh( const std::unique_ptr<QgsSymbol> &symbol,
   QgsFields fields;
   QgsSingleSymbolRenderer renderer( symbol->clone() );
   renderer.startRender( mContext, fields );
+  const QVector<QgsMeshVertex> &vertices = mTriangularMesh.vertices(); //Triangular mesh vertices contains also native mesh vertices
 
   for ( int i = 0; i < faces.size(); ++i )
   {
@@ -249,7 +250,11 @@ void QgsMeshLayerRenderer::renderMesh( const std::unique_ptr<QgsSymbol> &symbol,
     const QgsMeshFace &face = faces[i];
     QgsFeature feat;
     feat.setFields( fields );
-    QgsGeometry geom = QgsMeshUtils::toGeometry( face, mTriangularMesh.vertices() ); //Triangular mesh vertices contains also native mesh vertices
+    QgsGeometry geom = QgsMeshUtils::toGeometry( face, vertices );
+    const QgsRectangle bbox = geom.boundingBox();
+    if ( !mContext.extent().intersects( bbox ) )
+      continue;
+
     feat.setGeometry( geom );
     renderer.renderFeature( feat, mContext );
   }

src/core/mesh/qgsmeshvectorrenderer.cpp

@@ -199,9 +199,12 @@ void QgsMeshVectorRenderer::drawVectorDataOnVertices()
 
   for ( int i = 0; i < vertices.size(); ++i )
   {
+    if ( mContext.renderingStopped() )
+      break;
+
     const QgsMeshVertex &vertex = vertices.at( i );
-    //if (!nodeInsideView(nodeIndex))
-    //    continue;
+    if ( !mContext.extent().contains( vertex ) )
+      continue;
 
     double xVal = mDatasetValuesX[i];
     double yVal = mDatasetValuesY[i];
@@ -221,10 +224,13 @@ void QgsMeshVectorRenderer::drawVectorDataOnFaces()
 
   for ( int i = 0; i < centroids.count(); i++ )
   {
-    //if (elemOutsideView(elemIndex))
-    //    continue;
+    if ( mContext.renderingStopped() )
+      break;
 
     QgsPointXY center = centroids.at( i );
+    if ( !mContext.extent().contains( center ) )
+      continue;
+
     double xVal = mDatasetValuesX[i];
     double yVal = mDatasetValuesY[i];
     if ( nodataValue( xVal, yVal ) )
@@ -247,6 +253,9 @@ void QgsMeshVectorRenderer::drawVectorDataOnGrid()
 
   for ( int i = 0; i < triangles.size(); i++ )
   {
+    if ( mContext.renderingStopped() )
+      break;
+
     const QgsMeshFace &face = triangles[i];
 
     const int v1 = face[0], v2 = face[1], v3 = face[2];