raster interfaces stats fixes

Author: blazek

src/core/raster/qgsrasterinterface.cpp

@@ -15,6 +15,8 @@
  *                                                                         *
  ***************************************************************************/
 
+#include <typeinfo>
+
 #include <QByteArray>
 #include <QTime>
 
@@ -23,7 +25,7 @@
 
 QgsRasterInterface::QgsRasterInterface( QgsRasterInterface * input )
     : mInput( input )
-    , mTimeMinSize( 300 ) // dont forget resampling!
+    , mStatsOn( false )
 {
 }
 
@@ -51,31 +53,46 @@ void * QgsRasterInterface::block( int bandNo, QgsRectangle  const & extent, int
   time.start();
   void * b =  readBlock( bandNo, extent, width, height );
 
-  if ( width > mTimeMinSize && height > mTimeMinSize )
+  if ( mStatsOn )
   {
     if ( mTime.size() <= bandNo )
     {
       mTime.resize( bandNo + 1 );
     }
     // QTime counts only in miliseconds
-    mTime[bandNo] = time.elapsed();
+    // We are adding time until next clear, this way the time may be collected
+    // for the whole QgsRasterLayer::draw() for example, not just for a single part
+    mTime[bandNo] += time.elapsed();
     QgsDebugMsg( QString( "bandNo = %2 time = %3" ).arg( bandNo ).arg( mTime[bandNo] ) );
   }
   return b;
 }
 
-double QgsRasterInterface::time( )
+void QgsRasterInterface::setStatsOn( bool on )
 {
-  // We can only count give total time, because we have to subtract time of previous
+  if ( on )
+  {
+    mTime.clear();
+  }
+  if ( mInput ) mInput->setStatsOn( on );
+  mStatsOn = on;
+}
+
+double QgsRasterInterface::time( bool cumulative )
+{
+  // We can calculate total time only, because we have to subtract time of previous
   // interface(s) and we dont know how to assign bands to each other
   double t = 0;
   for ( int i = 1; i < mTime.size(); i++ )
   {
     t += mTime[i];
   }
+  if ( cumulative ) return t;
+
   if ( mInput )
   {
-    t -= mInput->time();
+    QgsDebugMsgLevel( QString( "%1 cumulative time = %2  time = %3" ).arg( typeid( *( this ) ).name() ).arg( t ).arg( t -  mInput->time( true ) ), 3 );
+    t -= mInput->time( true );
   }
   return t;
 }

src/core/raster/qgsrasterinterface.h

@@ -147,11 +147,14 @@ class CORE_EXPORT QgsRasterInterface
      */
     QImage * createImage( int width, int height, QImage::Format format );
 
-    /** Clear last rendering time */
-    void clearTime() { mTime.clear(); if ( mInput ) mInput->clearTime(); }
+    /** Switch on (and clear old statistics) or off collection of statistics */
+    void setStatsOn( bool on );
 
-    /** Last total time (for allbands) consumed by this interface for call to block() */
-    double time();
+    /** Last total time (for allbands) consumed by this interface for call to block()
+     * If cumulative is true, the result includes also time spent in all preceding
+     * interfaces. If cumulative is false, only time consumed by this interface is
+     * returned. */
+    double time( bool cumulative = false );
 
   protected:
     // QgsRasterInterface used as input
@@ -161,8 +164,8 @@ class CORE_EXPORT QgsRasterInterface
     // Last rendering cumulative (this and all preceding interfaces) times, from index 1
     QVector<double> mTime;
 
-    // Minimum block size to record time (to ignore thumbnails etc)
-    int mTimeMinSize;
+    // Collect statistics
+    int mStatsOn;
 };
 
 #endif

src/core/raster/qgsrasterlayer.cpp

@@ -832,13 +832,24 @@ void QgsRasterLayer::draw( QPainter * theQPainter,
     projector->setCRS( theRasterViewPort->mSrcCRS, theRasterViewPort->mDestCRS );
   }
 
+#ifdef QGISDEBUG
+  // Collect stats only for larger sizes to avoid confusion (small time values)
+  // after thumbnail render e.g. 120 is current thumbnail size
+  // TODO: consider another way to switch stats on/off or storing of last significant
+  //       stats somehow
+  if ( theRasterViewPort->drawableAreaXDim > 120 && theRasterViewPort->drawableAreaYDim > 120 )
+  {
+    mPipe.setStatsOn( true );
+  }
+#endif
+
   // Drawer to pipe?
-  mPipe.clearTime();
   QgsRasterDrawer drawer( mPipe.last() );
   drawer.draw( theQPainter, theRasterViewPort, theQgsMapToPixel );
 
-  // Print time stats
 #ifdef QGISDEBUG
+  mPipe.setStatsOn( false );
+  // Print time stats
   QgsDebugMsg( QString( "interface                  bands  time" ) );
   for ( int i = 0; i < mPipe.size(); i++ )
   {

src/core/raster/qgsrasterpipe.h

@@ -87,8 +87,8 @@ class CORE_EXPORT QgsRasterPipe
     QgsRasterResampleFilter * resampleFilter() const;
     QgsRasterProjector * projector() const;
 
-    /** Clear last rendering time */
-    void clearTime() { if ( last() ) last()->clearTime(); }
+    /** Set on/off collection of statistics */
+    void setStatsOn( bool on ) { if ( last() ) last()->setStatsOn( on ); }
 
   private:
     /** Get known parent type_info of interface parent */