Image Number 8 for United States Patent #7532222.
An anti-aliasing mechanism. In one aspect, one or more opacities are determined to apply to layers used to render an image. An order in which to render the layers is also determined. This order may correspond to an order in which points within the image are sampled. The first layer to render is set to an opacity that applies to it and rendered. The second layer to render is set at an opacity that applies to it and rendered on top of the first layer. In rendering the second layer, the opacities of the first and second layers are blended.