Re: Gravity Support / pangowin32
- From: Jeremy Moles <jeremy emperorlinux com>
- To: Behdad Esfahbod <behdad behdad org>
- Cc: gtk-i18n-list gnome org
- Subject: Re: Gravity Support / pangowin32
- Date: Tue, 06 Mar 2012 10:05:02 -0500
On Tue, 2012-03-06 at 09:20 -0500, Behdad Esfahbod wrote:
> On 02/22/2012 05:00 PM, Jeremy Moles wrote:
> > Hello everyone. I am interested in getting gravity support to work in
> > Pango on Windows using the Win32 backend (I haven't tested this using
> > hte Fc/FT backend on Windows).
> > Does anyone have any experience with this?
> Not really. I designed the vertical support in Pango, but I have no clue
> about the win32 backend.
> > Does anyone know where I
> > would need to start hacking to add support? I don't mind doing the work,
> > but I truly have no idea where to even start.
> Me neither. Debug back from where you see the problem?
> > In pangowin32-fontmap.c there is a routine:
> > pango_win32_font_map_load_font
> > ...and this routine will return a valid PangoFont* UNLESS you have
> > gravity set. For whatever reason, the current implementation doesn't
> > understand how to handle the "Rotated-*" style that is added inside the
> > description when gravity is set.
> Fix this function: pango_win32_face_get_face_name() to also unset gravity. I
> find that function gross BTW.
> > How does gravity actually work in Pango internally? Do the font files on
> > disk have to provide some extra hints?
> Not really. The backend needs to load a vertical variant of the font though.
> IIRC, on Windows, prepending an '@' character to the beginning of the family
> name loads the vertical-metrics variant. So you may want to try that. There,
> of course, may be other changes needed. Just search for gravity around the
> fontconfig backend and see what's going on...
I'm currently using mingw64 on Fedora16 to cross-compile Pango for
Windows. Is there a way to encourage Pango to use a particular
I don't mind using Fontconfig/Freetype if I need to; in the end, all
that is happening in our code is something very similar to what Clutter
does (or did): a PangoGlyphString is fed to our rendering callback
function, we use Cairo to rasterize the font into a texture, and
maintain our own caching atlas.
We don't actually ever use Pango to "draw" anything, we just use its
layout and styling engine. I don't know if this simplifies things or
At any rate, I'll try the things you mentioned right away...
> > Any help would be appreciated, and thanks beforehand...
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