Re: [ft] lsb/rsb_delta and vertical text (again)

[Brady Duga]

On May 9, 2007, at 9:42 PM, Werner LEMBERG wrote:

> This can easily be decided by using a higher resolution; then you'll
> clearly see whether there is some overlapping or not.

I'm pretty sure it doesn't overlap in the unhinted case, but does in  
the hinted case. The text is copied in 'or' mode, so the following  
character wouldn't set any part of the previous one to white. You  
would just get overlapping text. I will play some more with potential  
tsb/bsb_delta, and look at supplying a patch for that.

> Interesting.  You might analyze it with the ttx disassembler (from
> fonttools.sf.net) and/or checking it with FontForge.

I have looked at it in FontForge and it looks like the vertical  
advances are not properly set (they look like values I would expect  
for a normal, full-height font). The owner of the font has said they  
think there are problems with its metrics. Apparently, it is used  
with some custom DTP app which just does the right thing (not sure  
how it knows what the right thing is, but I suspect hackery).

--Brady