Add "smooth" property to graphics module

This is just a simple bind and addition of a “smooth” property in the
graphics module, to fix fatal issue #2

binding-mri/graphics-binding.cpp

@@ -198,6 +198,7 @@ RB_METHOD(graphicsPlayMovie)
 DEF_GRA_PROP_I(FrameRate)
 DEF_GRA_PROP_I(FrameCount)
 DEF_GRA_PROP_I(Brightness)
+DEF_GRA_PROP_B(Smooth)
 
 DEF_GRA_PROP_B(Fullscreen)
 DEF_GRA_PROP_B(ShowCursor)
@@ -240,6 +241,8 @@ void graphicsBindingInit()
 	_rb_define_module_function(module, "play_movie", graphicsPlayMovie);
 	}
 
+	INIT_GRA_PROP_BIND( Smooth,     "smooth"      );
+
 	INIT_GRA_PROP_BIND( Fullscreen, "fullscreen"  );
 	INIT_GRA_PROP_BIND( ShowCursor, "show_cursor" );
 }

src/graphics.cpp

@@ -472,6 +472,7 @@ struct GraphicsPrivate
 	int frameRate;
 	int frameCount;
 	int brightness;
+	bool smooth;
 
 	FPSLimiter fpsLimiter;
 
@@ -935,6 +936,13 @@ void Graphics::fadein(int duration)
 	}
 }
 
+DEF_ATTR_RD_SIMPLE(Graphics, Smooth, bool, p->smooth)
+
+void Graphics::setSmooth(bool value)
+{
+	p->smooth = value;
+}
+
 Bitmap *Graphics::snapToBitmap()
 {
 	Bitmap *bitmap = new Bitmap(width(), height());

src/graphics.h

@@ -45,6 +45,7 @@ public:
 	DECL_ATTR( FrameRate,  int )
 	DECL_ATTR( FrameCount, int )
 	DECL_ATTR( Brightness, int )
+	DECL_ATTR( Smooth,    bool )
 
 	void wait(int duration);
 	void fadeout(int duration);