[cairo] API request: obtain the trapezoids that are outsideofthe surface

[Keith Packard]

Around 17 o'clock on Aug 27, Jost Boekemeier wrote:

> But it indeed calculates integers(!), so to compensate the loss of
> precision it must use some tricks which require knowledge about pixel
> positions. 

Tesselation of curves is necessarily specific to the pixel resolution of 
the output device if you want to improve the accuracy of the rendering on 
higher resolution devices.

Even tesselation of intersecting polygons involves the coordinate space 
available in the output device to represent the primitive polygons, in 
at least the X case, that coordinate space is represented as fractional 
pixel positions.

-keith


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