Standard apertures are circle, rect, oblong and polygon (regular polygonal shapes with 3 to 12 vertices)
The support of the standard aperture type polygon was missing in Gerber plotter.
This handles images with transparent colors by mapping the transparent
color to white. This only works when plotted into the background.
(cherry picked from commit b32439a694)
This corrects an issue with fill segments-per-circle and moves the error
to segmetns calculation down in a number of functions to expose the
single value for approximation
Allows 0 to 4 chamfered corners, not only one.
A custom shape allow this kind of shape. However because it is a primitive,
it is easier to edit and it support thermal reliefs.
jean-pierre charras
Jeff Young
Seth Hillbrand
Jon Evans