Hi Keith,
Just looking over the render protocol spec. I notice that the
trapezoid is specified there as two spans, each with a left, right,
and y fixed-point value.
The specification also requires left to be less than right for each
span, (which would eliminate the problematic intersection within a
pixel, but might make it harder to use trapezoids for all triangles).
>From our discussion it seems that you've already changed your mind in
favor of a trapezoid representation using two y values and four
arbitrary points, (which then makes it easier to share lines across
multiple polygons).
So I am thinking of:
typedef struct {
xPointFixed p1;
xPointFixed p2;
} xLineFixed;
typedef struct {
Fixed top;
Fixed bottom;
xLineFixed left;
xLineFixed right;
} xTrap;
Seem reasonable enough?
-Carl
--
Carl Worth
USC Information Sciences Institute [EMAIL PROTECTED]
3811 N. Fairfax Dr. #200, Arlington VA 22203 703-812-3725
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