On Tue, Sep 8, 2009 at 11:51 AM, Mark Mentovai<m...@chromium.org> wrote:
> Avi Drissman wrote:
>> Screw #2: The actual scrollbar is drawn just a wee bit shorter. Cocoa sizes
>> scrollbar thumbs with a proportion value ([0..1]) while HITheme uses a
>> "viewsize" value related to the physical size of the scrollbar. The precise
>> formula Cocoa uses to turn the view size into its proportion value is
>> unknown and would either have to be coaxed out of Apple or
>> reverse-engineered. But even if you could fix both of these screws, you'd
>> have to deal with...
>
> This all sounds reasonable to me. I'd still like to know a little bit
> more about "screw #2" because it seems like something that we should
> understand a bit better before we decide to establish our own
> baselines for these tests.
>
> I wonder what happens when the viewsize or one of the other parameters
> is changed by ±15. Maybe Cocoa is accounting for the "other"
> scrollbar's presence or absence differently.
Not saying you should do the same thing, but getting the font metrics
on Linux to match Windows I recall agl and deanm spent a week or two
going back and forth with "ok, if you add 0.82 * the baseline here it
fixes these three fonts but that fourth one is still different".
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