1. A method of rendering a graphic object, the method comprising: tessellating the graphic object into a plurality of original polygons; forming a plurality of expanded polygons based on the plurality of original polygons, the expanded polygons encompassing sampling points of pixels touched by edges of the graphic object; rendering the plurality of expanded polygons in accordance with a centre-intersect pixel placement rule as applied to the plurality of expanded polygons; and excluding pixels which are rendered by the rendering of the plurality of expanded polygons and which violate an area-intersect pixel placement rule as applied to the plurality of original polygons.