Introducing vRound function.

Shortcut to round double to X points decimal.

--HG--
branch : develop

src/app/valentina/dialogs/vabstractlayoutdialog.cpp

@@ -28,6 +28,7 @@
 
 #include "vabstractlayoutdialog.h"
 #include "../core/vapplication.h"
+#include "../vmisc/vmath.h"
 
 //must be the same order as PaperSizeTemplate constants
 const VAbstractLayoutDialog::FormatsVector VAbstractLayoutDialog::pageFormatNames
@@ -172,12 +173,12 @@ QSizeF VAbstractLayoutDialog::RoundTemplateSize(qreal width, qreal height, Unit
         case Unit::Cm:
         case Unit::Mm:
         case Unit::Px:
-            w = qRound(width * 100.0) / 100.0;
-            h = qRound(height * 100.0) / 100.0;
+            w = vRound(width, 2);
+            h = vRound(height, 2);
             return QSizeF(w, h);
         case Unit::Inch:
-            w = qRound(width * 100000.0) / 100000.0;
-            h = qRound(height * 100000.0) / 100000.0;
+            w = vRound(width, 5);
+            h = vRound(height, 5);
             return QSizeF(w, h);
         default:
             break;

src/libs/vmisc/vmath.h

@@ -51,5 +51,9 @@
 #define M_EULER (0.57721566490153286060)
 #endif
 
+template <typename T>
+Q_DECL_CONSTEXPR inline T vRound(T d, int p)
+{ return p > 0 ? qRound(d * (p * 10.0)) / (p * 10.0) : qRound(d); }
+
 #endif // VMATH_H