zoom (was Re: commit (head): 7610)

On win32 zooming is meant to be done by changing the relative extents
of the viewport and of the window; adopting this mechanism should not
only get rid of the hinting problem, but we would get completely rid
of the tlu -> tdu conversions, since by setting the extents of window
and viewport appropriately will allow us to feed the win32 API our
layout units.

In order to do this, all zoom scalling would have to be moved inside
the platform graphics classes -- in essence, all the tlu() and
related methods should be protected.

I need to grep throught the code to see what would need to be
changed; a quick scan through some of the files suggests this might
not be as much XP work as I initially though; my main concern is the
effect this would have on the other platforms.

Tomas

 
> > Op do, 28-10-2004 te 20:56 +0100, schreef Tomas Frydrych:
> >>
> >> This is another stab at 7610. The outstanding problem is actually
> >> quite different than the original bug. It is the old problem of font
> >> scaling; the win32 zoom is implemented by changing the size of the
> >> font we request from the system, which results in non-linear scaling
> >> of the widths. What I have done is to measure the font widths always
> >> with a 100% resolution and then scaling them for our zoom. This
> >> ensures that we get identical layout at all zooms, but because the
> >> character advances we now use for the drawing do not match those for
> >> the font if we are at other zoom than 100%, it does not look that
> >> pretty. This fix is far from ideal, but is forced by bad desing. I am
> >> planing to revisit the whole question of zoom once 2.2 is out of the
> >> way.
> >
> > I'd say, please do it _now_ (if you have the time)... This has been
> > broken waaaaay to long imo (since 1.1.4 or something like that!).
> >
>
> I think I agree. If you know how to fix it, and you think you can get it
> right in less than a month, fix it now. We want 2.2 to rock.
> We've all worked really hard to get where we are now, lets do this right.
>
> Martin
>
> > Marc
> >
> >
>
Received on Mon Nov 1 10:05:39 2004