Re: [ft-devel] Peculiar Hinting / Rendering Behavior

[Darrell Bellert]

Hi Werner -

It has been about a year since I last submitted this and I was wondering 
if any progress has been made on it?  I'm not sure how your development 
environment works.  Do you have folks who regularly work on bugs like 
this or would it be in my best interest to start debugging this myself?

Thanks,

Darrell

On 01/23/2014 04:04 AM, Werner LEMBERG wrote:
> Hello Darrell!
>
>
> > I am using freetype 2.5.0 and have encountered an interesting
> > rendering artefact around hinting.
> It's not related to hinting...
>
> > I am using the Microsoft "MS Mincho Regular" true type typeface
> > (msmincho.ttc) found with Windows 8:
> >
> > ftview -m "四" -r 150 9 msmincho.ttc
> > (that's character 0x56db for the message)
> >
> > When the viewer loads, do two things:
> > (1) Hit 'b' to turn embedded bitmap strikes OFF.
> > (2) Hit 'a' to turn anti-aliasing OFF
> >
> > In my version of ftview, following these two steps results in the
> > left vertical bar of the character to go missing.  What I find to be
> > rather interesting is that when I hit the 'h' key to turn hinting
> > OFF in ftview, then the left vertical bar of the glyph returns!
> Here's another recipe to see the artifact even better (I'm using
> msmincho.ttc from Windows 7):
>
>    ftgrid -f 4420 19 msmincho.ttc
>
> (value 4420 is the glyph index of U+56DB in this font).  After
> pressing key `a', a vertical line on the left is missing in the
> outline.  Interestingly, this happens at 100% zooming only.
>
> I've poked around a bit, but I'm still clueless which component causes
> this.  This needs more debugging, so it may take a while until I find
> time for that – it's one of the weirdest rendering problem in FreeType
> I've ever encountered :-)
>
>
>      Werner