Feature #8725: drawConvexPolygon() can be faster

ahuarte47 · ahuarte47 · commit c9fccbd0107c · 2013-10-27T02:39:44.000+02:00
On some platforms (e.g. X11), the drawConvexPolygon() function can be faster than the drawPolygon() function. https://qt-project.org/doc/qt-4.8/qpainter.html#drawConvexPolygon
diff --git a/src/core/symbology-ng/qgssymbollayerv2.cpp b/src/core/symbology-ng/qgssymbollayerv2.cpp
@@ -335,7 +335,7 @@ void QgsFillSymbolLayerV2::_renderPolygon( QPainter* p, const QPolygonF& points,
   if ( points.size()<=5 && QgsFeatureRequest::canbeGeneralizedByWndBoundingBox( points, context.layer() ? context.layer()->simplifyDrawingTol() : QgsFeatureRequest::MAPTOPIXEL_THRESHOLD_DEFAULT ) && p->renderHints() & QPainter::Antialiasing )
   {
     p->setRenderHint( QPainter::Antialiasing, false );
-    p->drawPolygon( points );
+    p->drawConvexPolygon( points );
     p->setRenderHint( QPainter::Antialiasing, true );
     return;
   }

Original file line number	Diff line number	Diff line change
`@@ -335,7 +335,7 @@ void QgsFillSymbolLayerV2::_renderPolygon( QPainter* p, const QPolygonF& points,`
`335`	`335`	`if ( points.size()<=5 && QgsFeatureRequest::canbeGeneralizedByWndBoundingBox( points, context.layer() ? context.layer()->simplifyDrawingTol() : QgsFeatureRequest::MAPTOPIXEL_THRESHOLD_DEFAULT ) && p->renderHints() & QPainter::Antialiasing )`
`336`	`336`	`{`
`337`	`337`	`p->setRenderHint( QPainter::Antialiasing, false );`
`338`		`- p->drawPolygon( points );`
	`338`	`+ p->drawConvexPolygon( points );`
`339`	`339`	`p->setRenderHint( QPainter::Antialiasing, true );`
`340`	`340`	`return;`
`341`	`341`	`}`