[cairo] Mac Tiger Core Image

[Bill Spitzak]

Nathan Hurst wrote:

> As long as you don't have issues with edge pixels not being in either 
> set, which is very hard /impossible to avoid?  I remember spending a lot 
> of time trying to find a way around this some years ago, but there was 
> no happy solution.

"aliased" polygon-fill can be defined as producing a shape such that if 
the outlines are the same of the two adjoining shapes, no pixel is 
missed and no pixel is filled by both. The usual method is to fill the 
pixel if the point at the center is inside the shape. If the pixel is on 
the edge the decision is made by whether the filled area is above or 
below it.

The big problem with these algorithims is that a thin object completely 
disappears. This makes this algorithim useless for strokes or letters or 
anything other than fairly large (>1 pixel) polygons.