#8725-R: simplifier execute in rendering loop

Author: ahuarte47

src/core/qgsfeaturerequest.cpp

@@ -23,9 +23,6 @@ QgsFeatureRequest::QgsFeatureRequest()
     : mFilter( FilterNone )
     , mFilterExpression( 0 )
     , mFlags( 0 )
-    , mMapCoordTransform( NULL )
-    , mMapToPixel( NULL )
-    , mMapToPixelTol( QGis::DEFAULT_MAPTOPIXEL_THRESHOLD )
 {
 }
 
@@ -34,9 +31,6 @@ QgsFeatureRequest::QgsFeatureRequest( QgsFeatureId fid )
     , mFilterFid( fid )
     , mFilterExpression( 0 )
     , mFlags( 0 )
-    , mMapCoordTransform( NULL )
-    , mMapToPixel( NULL )
-    , mMapToPixelTol( QGis::DEFAULT_MAPTOPIXEL_THRESHOLD )
 {
 }
 
@@ -45,19 +39,13 @@ QgsFeatureRequest::QgsFeatureRequest( const QgsRectangle& rect )
     , mFilterRect( rect )
     , mFilterExpression( 0 )
     , mFlags( 0 )
-    , mMapCoordTransform( NULL )
-    , mMapToPixel( NULL )
-    , mMapToPixelTol( QGis::DEFAULT_MAPTOPIXEL_THRESHOLD )
 {
 }
 
 QgsFeatureRequest::QgsFeatureRequest( const QgsExpression& expr )
     : mFilter( FilterExpression )
     , mFilterExpression( new QgsExpression( expr.expression() ) )
     , mFlags( 0 )
-    , mMapCoordTransform( NULL )
-    , mMapToPixel( NULL )
-    , mMapToPixelTol( QGis::DEFAULT_MAPTOPIXEL_THRESHOLD )
 {
 }
 
@@ -82,9 +70,6 @@ QgsFeatureRequest& QgsFeatureRequest::operator=( const QgsFeatureRequest & rh )
     mFilterExpression = 0;
   }
   mAttrs = rh.mAttrs;
-  mMapCoordTransform = rh.mMapCoordTransform;
-  mMapToPixel = rh.mMapToPixel;
-  mMapToPixelTol = rh.mMapToPixelTol;
   return *this;
 }
 
@@ -189,21 +174,3 @@ bool QgsFeatureRequest::acceptFeature( const QgsFeature& feature )
 
   return true;
 }
-
-QgsFeatureRequest& QgsFeatureRequest::setCoordinateTransform( const QgsCoordinateTransform* ct )
-{
-  mMapCoordTransform = ct;
-  return *this;
-}
-
-QgsFeatureRequest& QgsFeatureRequest::setMapToPixel( const QgsMapToPixel* mtp )
-{
-  mMapToPixel = mtp;
-  return *this;
-}
-
-QgsFeatureRequest& QgsFeatureRequest::setMapToPixelTol( float map2pixelTol )
-{
-  mMapToPixelTol = map2pixelTol;
-  return *this;
-}

src/core/qgsfeaturerequest.h

@@ -21,9 +21,6 @@
 #include "qgsrectangle.h"
 #include "qgsexpression.h"
 
-#include "qgscoordinatetransform.h"
-#include "qgsmaptopixel.h"
-
 #include <QList>
 typedef QList<int> QgsAttributeList;
 
@@ -64,9 +61,7 @@ class CORE_EXPORT QgsFeatureRequest
       NoFlags            = 0,
       NoGeometry         = 1,  //!< Geometry is not required. It may still be returned if e.g. required for a filter condition.
       SubsetOfAttributes = 2,  //!< Fetch only a subset of attributes (setSubsetOfAttributes sets this flag)
-      ExactIntersect     = 4,  //!< Use exact geometry intersection (slower) instead of bounding boxes
-      SimplifyGeometry   = 8,  //!< The geometries can be simplified using the current map2pixel context state (e.g. for fast rendering...)
-      SimplifyEnvelope   = 16  //!< The geometries can be fully simplified by its BoundingBox (e.g. for fast rendering...)
+      ExactIntersect     = 4   //!< Use exact geometry intersection (slower) instead of bounding boxes
     };
     Q_DECLARE_FLAGS( Flags, Flag )
 
@@ -140,15 +135,6 @@ class CORE_EXPORT QgsFeatureRequest
     // void setFilterNativeExpression(con QString& expr);   // using provider's SQL (if supported)
     // void setLimit(int limit);
 
-    const QgsCoordinateTransform* coordinateTransform() const { return mMapCoordTransform; }
-    QgsFeatureRequest& setCoordinateTransform( const QgsCoordinateTransform* ct );
-
-    const QgsMapToPixel* mapToPixel() const { return mMapToPixel; }
-    QgsFeatureRequest& setMapToPixel( const QgsMapToPixel* mtp );
-
-    float mapToPixelTol() const { return mMapToPixelTol; }
-    QgsFeatureRequest& setMapToPixelTol( float map2pixelTol );
-
   protected:
     FilterType mFilter;
     QgsRectangle mFilterRect;
@@ -157,13 +143,6 @@ class CORE_EXPORT QgsFeatureRequest
     QgsExpression* mFilterExpression;
     Flags mFlags;
     QgsAttributeList mAttrs;
-
-    //! For transformation between coordinate systems from current layer to map target. Can be 0 if on-the-fly reprojection is not used
-    const QgsCoordinateTransform* mMapCoordTransform;
-    //! For transformation between map coordinates and device coordinates
-    const QgsMapToPixel* mMapToPixel;
-    //! Factor tolterance to apply in transformation between map coordinates and device coordinates
-    float mMapToPixelTol;
 };
 
 Q_DECLARE_OPERATORS_FOR_FLAGS( QgsFeatureRequest::Flags )

src/core/qgsgeometrysimplifier.cpp

@@ -60,13 +60,13 @@ QgsTopologyPreservingSimplifier::~QgsTopologyPreservingSimplifier()
 }
 
 //! Returns a simplified version the specified geometry
-QgsGeometry* QgsTopologyPreservingSimplifier::simplify( QgsGeometry* geometry )
+QgsGeometry* QgsTopologyPreservingSimplifier::simplify( QgsGeometry* geometry ) const
 {
   return geometry->simplify( mTolerance );
 }
 
 //! Simplifies the specified geometry
-bool QgsTopologyPreservingSimplifier::simplifyGeometry( QgsGeometry* geometry )
+bool QgsTopologyPreservingSimplifier::simplifyGeometry( QgsGeometry* geometry ) const
 {
   QgsGeometry* g = geometry->simplify( mTolerance );
 

src/core/qgsgeometrysimplifier.h

@@ -28,9 +28,9 @@ class CORE_EXPORT QgsAbstractGeometrySimplifier
     virtual ~QgsAbstractGeometrySimplifier();
 
     //! Returns a simplified version the specified geometry
-    virtual QgsGeometry* simplify( QgsGeometry* geometry ) = 0;
+    virtual QgsGeometry* simplify( QgsGeometry* geometry ) const = 0;
     //! Simplifies the specified geometry
-    virtual bool simplifyGeometry( QgsGeometry* geometry ) = 0;
+    virtual bool simplifyGeometry( QgsGeometry* geometry ) const = 0;
 
     // MapToPixel simplification helper methods
   public:
@@ -59,9 +59,9 @@ class CORE_EXPORT QgsTopologyPreservingSimplifier : public QgsAbstractGeometrySi
 
   public:
     //! Returns a simplified version the specified geometry
-    virtual QgsGeometry* simplify( QgsGeometry* geometry );
+    virtual QgsGeometry* simplify( QgsGeometry* geometry ) const;
     //! Simplifies the specified geometry
-    virtual bool simplifyGeometry( QgsGeometry* geometry );
+    virtual bool simplifyGeometry( QgsGeometry* geometry ) const;
 };
 
 #endif // QGSGEOMETRYSIMPLIFIER_H

src/core/qgsmaptopixelgeometrysimplifier.cpp

@@ -352,7 +352,7 @@ bool QgsMapToPixelSimplifier::canbeGeneralizedByMapBoundingBox( const QgsRectang
 }
 
 //! Returns a simplified version the specified geometry (Removing duplicated points) when is applied the specified map2pixel context
-QgsGeometry* QgsMapToPixelSimplifier::simplify( QgsGeometry* geometry )
+QgsGeometry* QgsMapToPixelSimplifier::simplify( QgsGeometry* geometry ) const
 {
   QgsGeometry* g = new QgsGeometry();
 
@@ -393,7 +393,7 @@ bool QgsMapToPixelSimplifier::simplifyGeometry( QgsGeometry* geometry, int simpl
 }
 
 //! Simplifies the geometry (Removing duplicated points) when is applied the specified map2pixel context
-bool QgsMapToPixelSimplifier::simplifyGeometry( QgsGeometry* geometry )
+bool QgsMapToPixelSimplifier::simplifyGeometry( QgsGeometry* geometry ) const
 {
   return simplifyGeometry( geometry, mSimplifyFlags, mMapCoordTransform, mMapToPixel, mMapToPixelTol );
 }

src/core/qgsmaptopixelgeometrysimplifier.h

@@ -77,9 +77,9 @@ class CORE_EXPORT QgsMapToPixelSimplifier : public QgsAbstractGeometrySimplifier
     void setMapToPixelTol( float map2pixelTol ) { mMapToPixelTol = map2pixelTol; }
 
     //! Returns a simplified version the specified geometry
-    virtual QgsGeometry* simplify( QgsGeometry* geometry );
+    virtual QgsGeometry* simplify( QgsGeometry* geometry ) const;
     //! Simplifies the specified geometry
-    virtual bool simplifyGeometry( QgsGeometry* geometry );
+    virtual bool simplifyGeometry( QgsGeometry* geometry ) const;
 
     // MapToPixel simplification helper methods
   public:

src/core/qgsvectordataprovider.cpp

@@ -194,12 +194,6 @@ QString QgsVectorDataProvider::capabilitiesString() const
     QgsDebugMsg( "Capability: Change Geometries" );
   }
 
-  if ( abilities & QgsVectorDataProvider::SimplifyGeometries )
-  {
-    abilitiesList += tr( "Simplify Geometries" );
-    QgsDebugMsg( "Capability: Simplify Geometries before fetch the feature" );
-  }
-
   return abilitiesList.join( ", " );
 
 }

src/core/qgsvectordataprovider.h

@@ -86,8 +86,6 @@ class CORE_EXPORT QgsVectorDataProvider : public QgsDataProvider
       CreateAttributeIndex =         1 << 12,
       /** allows user to select encoding */
       SelectEncoding =               1 << 13,
-      /** supports simplification of geometries before fetch the feature */
-      SimplifyGeometries =           1 << 14,
     };
 
     /** bitmask of all provider's editing capabilities */

src/core/qgsvectorlayer.cpp

@@ -400,7 +400,7 @@ void QgsVectorLayer::drawLabels( QgsRenderContext& rendererContext )
 
 
 
-void QgsVectorLayer::drawRendererV2( QgsFeatureIterator &fit, QgsRenderContext& rendererContext, bool labeling )
+void QgsVectorLayer::drawRendererV2( QgsFeatureIterator &fit, QgsRenderContext& rendererContext, bool labeling, const QgsAbstractGeometrySimplifier* geometrySimplifier )
 {
   if ( !hasGeometryType() )
     return;
@@ -451,6 +451,13 @@ void QgsVectorLayer::drawRendererV2( QgsFeatureIterator &fit, QgsRenderContext&
       bool sel = mSelectedFeatureIds.contains( fet.id() );
       bool drawMarker = ( mEditBuffer && ( !vertexMarkerOnlyForSelection || sel ) );
 
+      // simplify the geometry using the current map2pixel context
+      if ( geometrySimplifier )
+      {
+        fet = QgsFeature( fet );
+        geometrySimplifier->simplifyGeometry( fet.geometry() );
+      }
+
       // render feature
       bool rendered = mRendererV2->renderFeature( fet, rendererContext, -1, sel, drawMarker );
 
@@ -493,7 +500,7 @@ void QgsVectorLayer::drawRendererV2( QgsFeatureIterator &fit, QgsRenderContext&
 #endif
 }
 
-void QgsVectorLayer::drawRendererV2Levels( QgsFeatureIterator &fit, QgsRenderContext& rendererContext, bool labeling )
+void QgsVectorLayer::drawRendererV2Levels( QgsFeatureIterator &fit, QgsRenderContext& rendererContext, bool labeling, const QgsAbstractGeometrySimplifier* geometrySimplifier )
 {
   if ( !hasGeometryType() )
     return;
@@ -539,6 +546,13 @@ void QgsVectorLayer::drawRendererV2Levels( QgsFeatureIterator &fit, QgsRenderCon
       continue;
     }
 
+    // simplify the geometry using the current map2pixel context
+    if ( geometrySimplifier )
+    {
+      fet = QgsFeature( fet );
+      geometrySimplifier->simplifyGeometry( fet.geometry() );
+    }
+
     if ( !features.contains( sym ) )
     {
       features.insert( sym, QList<QgsFeature>() );
@@ -698,14 +712,14 @@ bool QgsVectorLayer::draw( QgsRenderContext& rendererContext )
   //do startRender before getFeatures to give renderers the possibility of querying features in the startRender method
   mRendererV2->startRender( rendererContext, this );
 
-  QgsFeatureRequest& featureRequest = QgsFeatureRequest()
-                                      .setFilterRect( rendererContext.extent() )
-                                      .setSubsetOfAttributes( attributes );
+  QgsFeatureIterator fit = getFeatures( QgsFeatureRequest()
+                                        .setFilterRect( rendererContext.extent() )
+                                        .setSubsetOfAttributes( attributes ) );
 
-  QgsFeatureIterator fit = QgsFeatureIterator();
+  QgsAbstractGeometrySimplifier* geometrySimplifier = NULL;
 
-  // Enable the simplification of the geometries (Using the current map2pixel context) before fetch the features.
-  if ( simplifyDrawingCanbeApplied( QgsVectorLayer::GeometrySimplification | QgsVectorLayer::EnvelopeSimplification ) && !( featureRequest.flags() & QgsFeatureRequest::NoGeometry ) )
+  // enable the simplification of the geometries (Using the current map2pixel context) before send it to renderer engine.
+  if ( simplifyDrawingCanbeApplied( QgsVectorLayer::GeometrySimplification | QgsVectorLayer::EnvelopeSimplification ) )
   {
     QPainter* p = rendererContext.painter();
     float dpi = ( p->device()->logicalDpiX() + p->device()->logicalDpiY() ) / 2;
@@ -715,29 +729,21 @@ bool QgsVectorLayer::draw( QgsRenderContext& rendererContext )
     if ( mSimplifyDrawingHints & QgsVectorLayer::GeometrySimplification ) simplifyFlags |= QgsMapToPixelSimplifier::SimplifyGeometry;
     if ( mSimplifyDrawingHints & QgsVectorLayer::EnvelopeSimplification ) simplifyFlags |= QgsMapToPixelSimplifier::SimplifyEnvelope;
 
-    QgsFeatureRequest::Flags requestFlags = QgsFeatureRequest::NoFlags;
-    if ( mSimplifyDrawingHints & QgsVectorLayer::GeometrySimplification ) requestFlags |= QgsFeatureRequest::SimplifyGeometry;
-    if ( mSimplifyDrawingHints & QgsVectorLayer::EnvelopeSimplification ) requestFlags |= QgsFeatureRequest::SimplifyEnvelope;
-
-    featureRequest.setFlags( featureRequest.flags() | requestFlags );
-    featureRequest.setCoordinateTransform( rendererContext.coordinateTransform() );
-    featureRequest.setMapToPixel( &rendererContext.mapToPixel() );
-    featureRequest.setMapToPixelTol( map2pixelTol );
-
-    QgsMapToPixelSimplifier* simplifier =
+    geometrySimplifier =
       new QgsMapToPixelSimplifier( simplifyFlags, rendererContext.coordinateTransform(), &rendererContext.mapToPixel(), map2pixelTol );
-
-    fit = QgsFeatureIterator( new QgsSimplifiedVectorLayerFeatureIterator( this, featureRequest, simplifier ) );
-  }
-  else
-  {
-    fit = getFeatures( featureRequest );
   }
 
   if (( mRendererV2->capabilities() & QgsFeatureRendererV2::SymbolLevels ) && mRendererV2->usingSymbolLevels() )
-    drawRendererV2Levels( fit, rendererContext, labeling );
+    drawRendererV2Levels( fit, rendererContext, labeling, geometrySimplifier );
   else
-    drawRendererV2( fit, rendererContext, labeling );
+    drawRendererV2( fit, rendererContext, labeling, geometrySimplifier );
+
+  // release the optional geometry simplifier
+  if ( geometrySimplifier )
+  {
+    delete geometrySimplifier;
+    geometrySimplifier = NULL;
+  }
 
   return true;
 }

src/core/qgsvectorlayer.h

@@ -57,6 +57,7 @@ class QgsDiagramLayerSettings;
 class QgsGeometryCache;
 class QgsVectorLayerEditBuffer;
 class QgsSymbolV2;
+class QgsAbstractGeometrySimplifier;
 
 typedef QList<int> QgsAttributeList;
 typedef QSet<int> QgsAttributeIds;
@@ -729,12 +730,12 @@ class CORE_EXPORT QgsVectorLayer : public QgsMapLayer
     /** Draw layer with renderer V2. QgsFeatureRenderer::startRender() needs to be called before using this method
      * @note added in 1.4
      */
-    void drawRendererV2( QgsFeatureIterator &fit, QgsRenderContext& rendererContext, bool labeling );
+    void drawRendererV2( QgsFeatureIterator &fit, QgsRenderContext& rendererContext, bool labeling, const QgsAbstractGeometrySimplifier* geometrySimplifier = NULL );
 
     /** Draw layer with renderer V2 using symbol levels. QgsFeatureRenderer::startRender() needs to be called before using this method
      * @note added in 1.4
      */
-    void drawRendererV2Levels( QgsFeatureIterator &fit, QgsRenderContext& rendererContext, bool labeling );
+    void drawRendererV2Levels( QgsFeatureIterator &fit, QgsRenderContext& rendererContext, bool labeling, const QgsAbstractGeometrySimplifier* geometrySimplifier = NULL );
 
     /** Returns point, line or polygon */
     QGis::GeometryType geometryType() const;

src/core/qgsvectorlayerfeatureiterator.cpp

@@ -589,47 +589,3 @@ void QgsVectorLayerFeatureIterator::updateFeatureGeometry( QgsFeature &f )
   if ( mChangedGeometries.contains( f.id() ) )
     f.setGeometry( mChangedGeometries[f.id()] );
 }
-
-/***************************************************************************
-    QgsSimplifiedVectorLayerFeatureIterator class
-    ----------------------
-    begin                : December 2013
-    copyright            : (C) 2013 by Alvaro Huarte
-    email                : http://wiki.osgeo.org/wiki/Alvaro_Huarte
-
- ***************************************************************************
- *                                                                         *
- *   This program is free software; you can redistribute it and/or modify  *
- *   it under the terms of the GNU General Public License as published by  *
- *   the Free Software Foundation; either version 2 of the License, or     *
- *   (at your option) any later version.                                   *
- *                                                                         *
- ***************************************************************************/
-
-QgsSimplifiedVectorLayerFeatureIterator::QgsSimplifiedVectorLayerFeatureIterator( QgsVectorLayer* layer, const QgsFeatureRequest& request, QgsAbstractGeometrySimplifier* simplifier )
-    : QgsVectorLayerFeatureIterator( layer, request )
-    , mSimplifier( simplifier )
-{
-  mSupportsPresimplify = layer->dataProvider()->capabilities() & QgsVectorDataProvider::SimplifyGeometries;
-}
-
-QgsSimplifiedVectorLayerFeatureIterator::~QgsSimplifiedVectorLayerFeatureIterator()
-{
-  if ( mSimplifier )
-  {
-    delete mSimplifier;
-    mSimplifier = NULL;
-  }
-}
-
-//! fetch next feature, return true on success
-bool QgsSimplifiedVectorLayerFeatureIterator::fetchFeature( QgsFeature& feature )
-{
-  if ( QgsVectorLayerFeatureIterator::fetchFeature( feature ) )
-  {
-    const QgsMapToPixel* mtp = mRequest.mapToPixel();
-    if ( mtp && !mSupportsPresimplify && mSimplifier ) mSimplifier->simplifyGeometry( feature.geometry() );
-    return true;
-  }
-  return false;
-}