Core/Color: Add IsOpaque method

Former-commit-id: b730460b9d81adbcee983648145cbc7a97301329

include/Nazara/Core/Color.hpp

@@ -25,6 +25,8 @@ namespace Nz
 			inline Color(const Color& color) = default;
 			inline ~Color() = default;
 
+			inline bool IsOpaque() const;
+
 			inline String ToString() const;
 
 			inline Color operator+(const Color& angles) const;

include/Nazara/Core/Color.inl

@@ -72,6 +72,15 @@ namespace Nz
 	{
 	}
 
+	/*!
+	* \brief Return true is the color has no degree of transparency
+	* \return true if the color has an alpha value of 255
+	*/
+	inline bool Color::IsOpaque() const
+	{
+		return a == 255;
+	}
+
 	/*!
 	* \brief Converts this to string
 	* \return String representation of the object "Color(r, g, b[, a])"