other workaround for Qt#5114 (fixes #3250, #3028, #2598)

Author: jef-n

src/app/composer/qgscomposer.cpp

@@ -66,9 +66,7 @@
 #include <QToolBar>
 #include <QToolButton>
 #include <QUndoView>
-
-
-
+#include <QPaintEngine>
 
 
 QgsComposer::QgsComposer( QgisApp *qgis, const QString& title ): QMainWindow(), mTitle( title ), mUndoView( 0 )
@@ -486,6 +484,36 @@ void QgsComposer::on_mActionRefreshView_triggered()
   mComposition->update();
 }
 
+// Hack to workaround Qt #5114 by disabling PatternTransform
+class QgsPaintEngineHack : public QPaintEngine
+{
+  public:
+    void fixFlags()
+    {
+      gccaps = 0;
+      gccaps |= ( QPaintEngine::PrimitiveTransform
+                  // | QPaintEngine::PatternTransform
+                  | QPaintEngine::PixmapTransform
+                  // | QPaintEngine::PatternBrush
+                  // | QPaintEngine::LinearGradientFill
+                  // | QPaintEngine::RadialGradientFill
+                  // | QPaintEngine::ConicalGradientFill
+                  | QPaintEngine::AlphaBlend
+                  // | QPaintEngine::PorterDuff
+                  | QPaintEngine::PainterPaths
+                  | QPaintEngine::Antialiasing
+                  | QPaintEngine::BrushStroke
+                  | QPaintEngine::ConstantOpacity
+                  | QPaintEngine::MaskedBrush
+                  // | QPaintEngine::PerspectiveTransform
+                  | QPaintEngine::BlendModes
+                  // | QPaintEngine::ObjectBoundingModeGradients
+                  | QPaintEngine::RasterOpModes
+                  | QPaintEngine::PaintOutsidePaintEvent
+                );
+    }
+};
+
 void QgsComposer::on_mActionExportAsPDF_triggered()
 {
   QSettings myQSettings;  // where we keep last used filter in persistent state
@@ -521,6 +549,14 @@ void QgsComposer::on_mActionExportAsPDF_triggered()
   printer.setOutputFileName( myOutputFileNameQString );
   printer.setPaperSize( QSizeF( mComposition->paperWidth(), mComposition->paperHeight() ), QPrinter::Millimeter );
 
+  QPaintEngine *engine = printer.paintEngine();
+  if ( engine && engine->hasFeature( QPaintEngine::PatternTransform ) )
+  {
+    QgsPaintEngineHack *hack = static_cast<QgsPaintEngineHack*>( engine );
+    hack->fixFlags();
+    Q_ASSERT( !engine->hasFeature( QPaintEngine::PatternTransform ) );
+  }
+
   print( printer );
 }
 

src/mapserver/qgswmsserver.cpp

@@ -51,6 +51,7 @@
 #include <QPrinter>
 #include <QSvgGenerator>
 #include <QUrl>
+#include <QPaintEngine>
 
 QgsWMSServer::QgsWMSServer( std::map<QString, QString> parameters, QgsMapRenderer* renderer )
     : mParameterMap( parameters )
@@ -337,6 +338,36 @@ QDomDocument QgsWMSServer::getStyle()
   return mConfigParser->getStyle( styleName, layerName );
 }
 
+// Hack to workaround Qt #5114 by disabling PatternTransform
+class QgsPaintEngineHack : public QPaintEngine
+{
+  public:
+    void fixFlags()
+    {
+      gccaps = 0;
+      gccaps |= ( QPaintEngine::PrimitiveTransform
+                  // | QPaintEngine::PatternTransform
+                  | QPaintEngine::PixmapTransform
+                  // | QPaintEngine::PatternBrush
+                  // | QPaintEngine::LinearGradientFill
+                  // | QPaintEngine::RadialGradientFill
+                  // | QPaintEngine::ConicalGradientFill
+                  | QPaintEngine::AlphaBlend
+                  // | QPaintEngine::PorterDuff
+                  | QPaintEngine::PainterPaths
+                  | QPaintEngine::Antialiasing
+                  | QPaintEngine::BrushStroke
+                  | QPaintEngine::ConstantOpacity
+                  | QPaintEngine::MaskedBrush
+                  // | QPaintEngine::PerspectiveTransform
+                  | QPaintEngine::BlendModes
+                  // | QPaintEngine::ObjectBoundingModeGradients
+                  | QPaintEngine::RasterOpModes
+                  | QPaintEngine::PaintOutsidePaintEvent
+                );
+    }
+};
+
 QByteArray* QgsWMSServer::getPrint( const QString& formatString )
 {
   QStringList layersList, stylesList, layerIdList;
@@ -429,6 +460,15 @@ QByteArray* QgsWMSServer::getPrint( const QString& formatString )
     printer.setPaperSize( QSizeF( c->paperWidth(), c->paperHeight() ), QPrinter::Millimeter );
     QRectF paperRectMM = printer.pageRect( QPrinter::Millimeter );
     QRectF paperRectPixel = printer.pageRect( QPrinter::DevicePixel );
+
+    QPaintEngine *engine = printer.paintEngine();
+    if ( engine->hasFeature( QPaintEngine::PatternTransform ) )
+    {
+      QgsPaintEngineHack *hack = static_cast<QgsPaintEngineHack*>( engine );
+      hack->fixFlags();
+      Q_ASSERT( !engine->hasFeature( QPaintEngine::PatternTransform ) );
+    }
+
     QPainter p( &printer );
     if ( c->printAsRaster() ) //embed one raster into the pdf
     {