Cleanup, add scanline mask builder

PortabilityLayer/LinePlotter.h

@@ -0,0 +1,30 @@
+#pragma once
+
+#include "PlotDirection.h"
+#include "Vec2i.h"
+
+namespace PortabilityLayer
+{
+	class LinePlotter
+	{
+	public:
+		LinePlotter();
+		PlotDirection PlotNext();
+		const Vec2i &GetPoint() const;
+
+		void Reset(const Vec2i &pointA, const Vec2i &pointB);
+
+	private:
+		Vec2i m_point;
+		Vec2i m_endPoint;
+		int32_t m_dx;
+		int32_t m_dy;
+		int32_t m_err;
+		bool m_xIncrPos;
+		bool m_yIncrPos;
+
+		PlotDirection m_xyMove;
+		PlotDirection m_xMove;
+		PlotDirection m_yMove;
+	};
+}