Re: [ft-devel] rendering mode of Firefox on Windows 10

[Nikolay Sivov]

On 05.11.2015 22:06, Khaled Hosny wrote:
> On Thu, Nov 05, 2015 at 07:43:21PM +0100, Werner LEMBERG wrote:
> > > > according to browserstack, the current release 41 of Firefox on
> > > > Windows 10 seems still to use the GDI framework, which implies font
> > > > rasterizer version 37, [...]
> > >
> > > I suspect that browserstack uses remote windows desktop connection
> > > or some such which I have noticed to be using Windows XP-like font
> > > rendering.
> >
> > Hmm.  How do you explain then that both Chrome and Edge use version 40
> > on browserstack?
>
> I see, Firefox uses DirectWrite only when 3D acceleration is enabled and
> GDI otherwise, so this might be the case here.

Hm, I wonder if that's because they also make use of Direct2D, because I 
don't think DirectWrite necessary talks to d3d system. Although it's 
possible some sophisticated logic to have system-wide font cache service 
to cache generated bitmaps or defer computations, and d3d is used for 
that directly or not, but I never heard about it.

gfx.font_rendering.directwrite.enabled was false, toggled to true, no 
difference.

gfx.font_rendering.cleartype_params.force_gdi_classic_for_families 
indeed contained something by default, I tried to reset to empty string, 
no change. Also if it really applies to specific family my guess would 
be that RasterInfo font won't be affected, as it's never on the list by 
default.

> Regards,
> Khaled
>
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