LibGfx: Give Size and Rect * and *= operators

Author: https://github.com/nico
Commit: 573d5b7ff2
Pull-request: https://github.com/SerenityOS/serenity/pull/4454

Libraries/LibGfx/Rect.h

@@ -364,6 +364,15 @@ public:
         return !(*this == other);
     }
 
+    Rect<T> operator*(T factor) const { return { m_location * factor, m_size * factor }; }
+
+    Rect<T>& operator*=(T factor)
+    {
+        m_location *= factor;
+        m_size *= factor;
+        return *this;
+    }
+
     void intersect(const Rect<T>&);
 
     static Rect<T> from_two_points(const Point<T>& a, const Point<T>& b)

Libraries/LibGfx/Size.h

@@ -98,6 +98,15 @@ public:
         return *this;
     }
 
+    Size<T> operator*(T factor) const { return { m_width * factor, m_height * factor }; }
+
+    Size<T>& operator*=(T factor)
+    {
+        m_width *= factor;
+        m_height *= factor;
+        return *this;
+    }
+
     T primary_size_for_orientation(Orientation orientation) const
     {
         return orientation == Orientation::Vertical ? height() : width();