Function PixelFormat.indexed
Wraps SDL_ISPIXELFORMAT_INDEXED which checks whether the dsdl is indexed
					
			bool indexed() @property @trusted const;
					
				
			Returns
true if it is indexed, otherwise false
Wraps SDL_ISPIXELFORMAT_INDEXED which checks whether the dsdl is indexed
					
			bool indexed() @property @trusted const;
					
				
			true if it is indexed, otherwise false