Optionally draw little rendering stats (switch on/off with S key)

Author: wonder-sk

src/core/qgsmaprendererjob.cpp

@@ -2,6 +2,7 @@
 #include "qgsmaprendererjob.h"
 
 #include <QPainter>
+#include <QTime>
 #include <QTimer>
 #include <QtConcurrentMap>
 
@@ -18,6 +19,7 @@
 QgsMapRendererJob::QgsMapRendererJob( const QgsMapSettings& settings )
   : mSettings(settings)
   , mCache( 0 )
+  , mRenderingTime( 0 )
 {
 }
 
@@ -71,6 +73,8 @@ void QgsMapRendererSequentialJob::start()
   if ( isActive() )
     return; // do nothing if we are already running
 
+  mRenderingStart.start();
+
   mErrors.clear();
 
   qDebug("SEQUENTIAL START");
@@ -148,6 +152,8 @@ void QgsMapRendererSequentialJob::internalFinished()
   mInternalJob->deleteLater();
   mInternalJob = 0;
 
+  mRenderingTime = mRenderingStart.elapsed();
+
   emit finished();
 }
 
@@ -180,6 +186,8 @@ void QgsMapRendererCustomPainterJob::start()
   if ( isActive() )
     return;
 
+  mRenderingStart.start();
+
   mActive = true;
 
   mErrors.clear();
@@ -291,6 +299,7 @@ QgsLabelingResults* QgsMapRendererCustomPainterJob::takeLabelingResults()
 void QgsMapRendererCustomPainterJob::futureFinished()
 {
   mActive = false;
+  mRenderingTime = mRenderingStart.elapsed();
   qDebug("QPAINTER futureFinished");
   emit finished();
 }
@@ -693,6 +702,8 @@ void QgsMapRendererParallelJob::start()
   if ( isActive() )
     return;
 
+  mRenderingStart.start();
+
   mStatus = RenderingLayers;
 
   delete mLabelingEngine;
@@ -837,6 +848,8 @@ void QgsMapRendererParallelJob::renderingFinished()
 
   mStatus = Idle;
 
+  mRenderingTime = mRenderingStart.elapsed();
+
   emit finished();
 }
 

src/core/qgsmaprendererjob.h

@@ -6,6 +6,7 @@
 #include <QImage>
 #include <QPainter>
 #include <QObject>
+#include <QTime>
 
 #include "qgsrendercontext.h"
 
@@ -77,6 +78,9 @@ class CORE_EXPORT QgsMapRendererJob : public QObject
   void setCache( QgsMapRendererCache* cache );
 
 
+  //! Find out how log it took to finish the job (in miliseconds)
+  int renderingTime() const { return mRenderingTime; }
+
 signals:
 
   //! emitted when asynchronous rendering is finished (or canceled).
@@ -108,6 +112,9 @@ class CORE_EXPORT QgsMapRendererJob : public QObject
   Errors mErrors;
 
   QgsMapRendererCache* mCache;
+
+  QTime mRenderingStart;
+  int mRenderingTime;
 };
 
 

src/gui/qgsmapcanvas.cpp

@@ -158,6 +158,7 @@ QgsMapCanvas::QgsMapCanvas( QWidget * parent, const char *name )
     , mJobCancelled( false )
     , mLabelingResults( 0 )
     , mUseParallelRendering( false )
+    , mDrawRenderingStats( false )
     , mCache( 0 )
 {
   setObjectName( name );
@@ -688,6 +689,23 @@ void QgsMapCanvas::rendererJobFinished()
     // emit renderComplete to get our decorations drawn
     QPainter p( &img );
     emit renderComplete( &p );
+
+    if ( mDrawRenderingStats )
+    {
+      int w = img.width(), h = img.height();
+      QFont fnt = p.font();
+      fnt.setBold( true );
+      p.setFont( fnt );
+      int lh = p.fontMetrics().height()*2;
+      QRect r( 0, h - lh, w, lh );
+      p.setPen( Qt::NoPen );
+      p.setBrush( QColor( 0, 0, 0, 110 ) );
+      p.drawRect( r );
+      p.setPen( Qt::white );
+      QString msg = QString("%1 :: %2 ms").arg( mUseParallelRendering ? "PARALLEL" : "SEQUENTIAL" ).arg( mJob->renderingTime() );
+      p.drawText( r, msg, QTextOption( Qt::AlignCenter ) );
+    }
+
     p.end();
 
     mMap->setContent( img, mSettings.visibleExtent() );
@@ -1069,6 +1087,11 @@ void QgsMapCanvas::keyPressEvent( QKeyEvent * e )
         refresh();
         break;
 
+    case Qt::Key_S:
+        mDrawRenderingStats = !mDrawRenderingStats;
+        refresh();
+        break;
+
       default:
         // Pass it on
         if ( mMapTool )

src/gui/qgsmapcanvas.h

@@ -577,6 +577,9 @@ class GUI_EXPORT QgsMapCanvas : public QGraphicsView
     //! Whether layers are rendered sequentially or in parallel
     bool mUseParallelRendering;
 
+    //! Whether to add rendering stats to the rendered image
+    bool mDrawRenderingStats;
+
     //! Optionally use cache with rendered map layers for the current map settings
     QgsMapRendererCache* mCache;