area + halo but then failing to limit overlap checks to that clip
area, resulting in bizarre errors whenever an array is made. Not
sure why the error didn't show up more often.
the handling of subcell instances generally. Previously it would check
the interaction between neighboring cells in an array without regard to
any material in the parent cell which might remove those errors;
consequently, the array would have to be DRC clean by itself in order for
the parent cell to show as DRC clean. The array check has been moved
inside the DRCInteractionCheck() routine, so that it runs only where
arrayed instances do not interact with anything else. Within interaction
areas, the area is flattened and checked, so the array check is not
needed.
DRC records contain an index into a string array instead of containing
a copy of a string. This is preliminary to changing the way the DRC
error plane is painted, so that the types painted will mark the error
type. This will (1) allow "drc why" to simply scan the DRC error
plane rather than running the DRC engine, (2) allow DRC errors to be
counted by area rather than by tile, and (3) let the DRC count be the
same whether done by "drc listall why" or "drc count".
Darryl L. Miles
Tim Edwards