note: this routine clips fills that extend off the edges... ideally this wouldn't happen, but it could happen if the truetype glyph bounding boxes are

since most people won't use this, find this table the first time it's needed

x^3 + a*x^2 + b*x + c = 0

tessellate until threshold p is happy... @TODO warped to compensate for non-linear stretching

This method can be modified to control the behavior of error message printing.