Create DrawQable class, make Image and Canvas DrawQable, and make love.graphics.drawq take a DrawQable as its first argument

src/modules/graphics/DrawQable.h

@@ -0,0 +1,64 @@
+/**
+* Copyright (c) 2006-2011 LOVE Development Team
+* 
+* This software is provided 'as-is', without any express or implied
+* warranty.  In no event will the authors be held liable for any damages
+* arising from the use of this software.
+* 
+* Permission is granted to anyone to use this software for any purpose,
+* including commercial applications, and to alter it and redistribute it
+* freely, subject to the following restrictions:
+* 
+* 1. The origin of this software must not be misrepresented; you must not
+*    claim that you wrote the original software. If you use this software
+*    in a product, an acknowledgment in the product documentation would be
+*    appreciated but is not required.
+* 2. Altered source versions must be plainly marked as such, and must not be
+*    misrepresented as being the original software.
+* 3. This notice may not be removed or altered from any source distribution.
+**/
+
+#ifndef LOVE_GRAPHICS_DRAWQABLE_H
+#define LOVE_GRAPHICS_DRAWQABLE_H
+
+// LOVE
+#include "Drawable.h"
+#include "Quad.h"
+
+namespace love
+{
+namespace graphics
+{
+	/**
+	* A DrawQable is anything that be drawn in part with a Quad.
+	**/
+	class DrawQable : public Drawable
+	{
+	public:
+
+		/**
+		* Destructor.
+		**/
+		virtual ~DrawQable();
+
+		/**
+		* Draws the object with the specified transformation.
+		* 
+		* @param quad The Quad to use to draw the object.
+		* @param x The position of the object along the x-axis.
+		* @param y The position of the object along the y-axis.
+		* @param angle The angle of the object (in radians).
+		* @param sx The scale factor along the x-axis.
+		* @param sy The scale factor along the y-axis.
+		* @param ox The origin offset along the x-axis.
+		* @param oy The origin offset along the y-axis.
+		* @param kx Shear along the x-axis.
+		* @param ky Shear along the y-axis.
+		**/
+		virtual void drawq(Quad * quad, float x, float y, float angle, float sx, float sy, float ox, float oy, float kx, float ky) const = 0;
+	};
+
+} // graphics
+} // love
+
+#endif // LOVE_GRAPHICS_DRAWQABLE_H