#8725: AA-disabling only for simplify factor>1

AA-disabling only is executed for '1-pixel' geometries when the
configuration slider is greater than minimum value. The rendering speed
up is lower (http://hub.qgis.org/issues/8725#note-59), but with higher
quality result

Author: ahuarte47

src/app/qgsoptions.cpp

@@ -561,7 +561,7 @@ QgsOptions::QgsOptions( QWidget *parent, Qt::WFlags fl ) :
   chkUseRenderCaching->setChecked( settings.value( "/qgis/enable_render_caching", false ).toBool() );
 
   // Default simplify drawing configuration
-  mSimplifyDrawingGroupBox->setChecked( settings.value( "/qgis/simplifyDrawingHints", (int)QgsVectorLayer::FullSimplification ).toInt() != QgsVectorLayer::NoSimplification );
+  mSimplifyDrawingGroupBox->setChecked( settings.value( "/qgis/simplifyDrawingHints", (int)QgsVectorLayer::DefaultSimplification ).toInt() != QgsVectorLayer::NoSimplification );
   mSimplifyDrawingSlider->setValue( (int)(5.0f * (settings.value( "/qgis/simplifyDrawingTol", 1.0F ).toFloat()-1)) );
   mSimplifyDrawingPanel->setVisible( mSimplifyDrawingSlider->value()>0 );
 
@@ -1097,8 +1097,14 @@ void QgsOptions::saveOptions()
   settings.setValue( "/qgis/capitaliseLayerName", capitaliseCheckBox->isChecked() );
 
   // Default simplify drawing configuration
-  settings.setValue( "/qgis/simplifyDrawingHints", (int)(mSimplifyDrawingGroupBox->isChecked() ? QgsVectorLayer::FullSimplification : QgsVectorLayer::NoSimplification) );
-  settings.setValue( "/qgis/simplifyDrawingTol", (float)(1.0f + 0.2f*mSimplifyDrawingSlider->value()) );
+  int simplifyDrawingHints = QgsVectorLayer::NoSimplification;
+  if ( mSimplifyDrawingGroupBox->isChecked() )
+  {
+    simplifyDrawingHints |= QgsVectorLayer::DefaultSimplification;
+    if ( mSimplifyDrawingSlider->value() > 0 ) simplifyDrawingHints |= QgsVectorLayer::AntialiasingSimplification;
+  }
+  settings.setValue( "/qgis/simplifyDrawingHints", simplifyDrawingHints );
+  settings.setValue( "/qgis/simplifyDrawingTol", 1.0f + 0.2f*mSimplifyDrawingSlider->value() );
 
   // project
   settings.setValue( "/qgis/projOpenAtLaunch", mProjectOnLaunchCmbBx->currentIndex() );

src/app/qgsvectorlayerproperties.cpp

@@ -535,7 +535,13 @@ void QgsVectorLayerProperties::apply()
   layer->setMetadataUrlFormat( mLayerMetadataUrlFormatComboBox->currentText() );
 
   //layer simplify drawing configuration
-  layer->setSimplifyDrawingHints( mSimplifyDrawingGroupBox->isChecked() ? QgsVectorLayer::FullSimplification : QgsVectorLayer::NoSimplification );
+  int simplifyDrawingHints = QgsVectorLayer::NoSimplification;
+  if ( mSimplifyDrawingGroupBox->isChecked() )
+  {
+    simplifyDrawingHints |= QgsVectorLayer::DefaultSimplification;
+    if ( mSimplifyDrawingSlider->value() > 0 ) simplifyDrawingHints |= QgsVectorLayer::AntialiasingSimplification;
+  }
+  layer->setSimplifyDrawingHints( simplifyDrawingHints );
   layer->setSimplifyDrawingTol( 1.0f + 0.2f*mSimplifyDrawingSlider->value() );
 
   // update symbology

src/core/qgsfeaturerequest.cpp

@@ -17,7 +17,6 @@
 #include "qgsfield.h"
 #include "qgsgeometry.h"
 
-#include <limits>
 #include <QStringList>
 
 QgsFeatureRequest::QgsFeatureRequest()

src/core/qgsvectorlayer.cpp

@@ -137,7 +137,7 @@ QgsVectorLayer::QgsVectorLayer( QString vectorLayerPath,
     , mValidExtent( false )
     , mSymbolFeatureCounted( false )
     , mCurrentRendererContext( 0 )
-    , mSimplifyDrawingHints( QgsVectorLayer::FullSimplification )
+    , mSimplifyDrawingHints( QGis::DEFAULT_MAPTOPIXEL_THRESHOLD > 1 ? QgsVectorLayer::FullSimplification : QgsVectorLayer::DefaultSimplification )
     , mSimplifyDrawingTol( QGis::DEFAULT_MAPTOPIXEL_THRESHOLD )
 
 {

src/core/qgsvectorlayer.h

@@ -1376,7 +1376,8 @@ class CORE_EXPORT QgsVectorLayer : public QgsMapLayer
       GeometrySimplification     = 1, //!< The geometries can be simplified using the current map2pixel context state
       EnvelopeSimplification     = 2, //!< The geometries can be fully simplified by its BoundingBox using the current map2pixel context state
       AntialiasingSimplification = 4, //!< The geometries can be rendered with 'AntiAliasing' disabled because of it is '1-pixel size'
-      FullSimplification         = 7, //!< All simplification hints can be applied
+      DefaultSimplification      = 3, //!< Default simplification hints can be applied ( Geometry + Envelope )
+      FullSimplification         = 7, //!< All simplification hints can be applied ( Geometry + Envelope + AA-disabling )
     };
     /** Set the Map2pixel simplification hints for fast rendering of features */
     void setSimplifyDrawingHints( int simplifyDrawingHints ) { mSimplifyDrawingHints = simplifyDrawingHints; }