#8725R: define simplifyDrawingCanbeApplied better

Author: ahuarte47

python/core/qgsvectorlayer.sip

@@ -1013,7 +1013,7 @@ class QgsVectorLayer : QgsMapLayer
     const QgsVectorSimplifyMethod& simplifyMethod() const;
 
     /** Returns whether the VectorLayer can apply the specified simplification hint */
-    bool simplifyDrawingCanbeApplied( int simplifyHint ) const;
+    bool simplifyDrawingCanbeApplied( const QgsRenderContext& renderContext, int simplifyHint ) const;
 
   public slots:
     /**

src/core/qgsvectorlayer.cpp

@@ -702,8 +702,7 @@ bool QgsVectorLayer::draw( QgsRenderContext& rendererContext )
                                       .setSubsetOfAttributes( attributes );
 
   // enable the simplification of the geometries (Using the current map2pixel context) before send it to renderer engine.
-  mCurrentRendererContext = &rendererContext;
-  if ( simplifyDrawingCanbeApplied( QgsVectorLayer::GeometrySimplification ) )
+  if ( simplifyDrawingCanbeApplied( rendererContext, QgsVectorLayer::GeometrySimplification ) )
   {
     QPainter* p = rendererContext.painter();
     double dpi = ( p->device()->logicalDpiX() + p->device()->logicalDpiY() ) / 2;
@@ -749,7 +748,6 @@ bool QgsVectorLayer::draw( QgsRenderContext& rendererContext )
   else
     drawRendererV2( fit, rendererContext, labeling );
 
-  mCurrentRendererContext = NULL;
   return true;
 }
 
@@ -1259,14 +1257,14 @@ bool QgsVectorLayer::setSubsetString( QString subset )
   return res;
 }
 
-bool QgsVectorLayer::simplifyDrawingCanbeApplied( int simplifyHint ) const
+bool QgsVectorLayer::simplifyDrawingCanbeApplied( const QgsRenderContext& renderContext, int simplifyHint ) const
 {
-  if ( mDataProvider && !mEditBuffer && ( hasGeometryType() && geometryType() != QGis::Point ) && ( mSimplifyMethod.simplifyHints() & simplifyHint ) && ( !mCurrentRendererContext || mCurrentRendererContext->useRenderingOptimization() ) )
+  if ( mDataProvider && !mEditBuffer && ( hasGeometryType() && geometryType() != QGis::Point ) && ( mSimplifyMethod.simplifyHints() & simplifyHint ) && renderContext.useRenderingOptimization() )
   {
     double maximumSimplificationScale = mSimplifyMethod.maximumScale();
 
     // check maximum scale at which generalisation should be carried out
-    if ( mCurrentRendererContext && maximumSimplificationScale > 1 && mCurrentRendererContext->rendererScale() <= maximumSimplificationScale )
+    if ( maximumSimplificationScale > 1 && renderContext.rendererScale() <= maximumSimplificationScale )
       return false;
 
     return true;

src/core/qgsvectorlayer.h

@@ -1387,7 +1387,7 @@ class CORE_EXPORT QgsVectorLayer : public QgsMapLayer
     inline const QgsVectorSimplifyMethod& simplifyMethod() const { return mSimplifyMethod; }
 
     /** Returns whether the VectorLayer can apply the specified simplification hint */
-    bool simplifyDrawingCanbeApplied( int simplifyHint ) const;
+    bool simplifyDrawingCanbeApplied( const QgsRenderContext& renderContext, int simplifyHint ) const;
 
   public slots:
     /**

src/core/symbology-ng/qgslinesymbollayerv2.cpp

@@ -183,7 +183,7 @@ void QgsSimpleLineSymbolLayerV2::renderPolyline( const QPolygonF& points, QgsSym
   p->setPen( context.selected() ? mSelPen : mPen );
 
   // Disable 'Antialiasing' if the geometry was generalized in the current RenderContext (We known that it must have least #2 points).
-  if ( points.size() <= 2 && context.layer() && context.layer()->simplifyDrawingCanbeApplied( QgsVectorLayer::AntialiasingSimplification ) && QgsAbstractGeometrySimplifier::canbeGeneralizedByDeviceBoundingBox( points, context.layer()->simplifyMethod().threshold() ) && ( p->renderHints() & QPainter::Antialiasing ) )
+  if ( points.size() <= 2 && context.layer() && context.layer()->simplifyDrawingCanbeApplied( context.renderContext(), QgsVectorLayer::AntialiasingSimplification ) && QgsAbstractGeometrySimplifier::canbeGeneralizedByDeviceBoundingBox( points, context.layer()->simplifyMethod().threshold() ) && ( p->renderHints() & QPainter::Antialiasing ) )
   {
     p->setRenderHint( QPainter::Antialiasing, false );
     p->drawPolyline( points );

src/core/symbology-ng/qgssymbollayerv2.cpp

@@ -388,7 +388,7 @@ void QgsFillSymbolLayerV2::_renderPolygon( QPainter* p, const QPolygonF& points,
   }
 
   // Disable 'Antialiasing' if the geometry was generalized in the current RenderContext (We known that it must have least #5 points).
-  if ( points.size() <= 5 && context.layer() && context.layer()->simplifyDrawingCanbeApplied( QgsVectorLayer::AntialiasingSimplification ) && QgsAbstractGeometrySimplifier::canbeGeneralizedByDeviceBoundingBox( points, context.layer()->simplifyMethod().threshold() ) && ( p->renderHints() & QPainter::Antialiasing ) )
+  if ( points.size() <= 5 && context.layer() && context.layer()->simplifyDrawingCanbeApplied( context.renderContext(), QgsVectorLayer::AntialiasingSimplification ) && QgsAbstractGeometrySimplifier::canbeGeneralizedByDeviceBoundingBox( points, context.layer()->simplifyMethod().threshold() ) && ( p->renderHints() & QPainter::Antialiasing ) )
   {
     p->setRenderHint( QPainter::Antialiasing, false );
     p->drawRect( points.boundingRect() );