[ft-devel] drop-out control

[Werner LEMBERG]

Almost four years ago I've written about this topic, but haven't
received an answer:

1. The argument of both the SCANTYPE amd SCANCTRL instructions (in
   ttinterp.c) are parsed but never used.

2. ftraster.c apparently supports TrueType drop-out control modes 1,
   2, 4, and 5, but it doesn't support mode 0.  This looks very
   strange.  Maybe this problem has never shown up because the mode is
   always set to 2 (which is strange also).

   Are ftraster's drop-out control modes the ones described in the
   TrueType specification?

3. As Top Bishop noted five years ago, FT_OUTLINE_IGNORE_DROPOUTS (in
   ftimage.h) is not implemented.

Now that the rasterizer behaves more or less identical to the
implementation of Microsoft, I think it would be a good idea to close
this last gap.

David, can you shed some light on it?


    Werner