Re: Units and resolution independence for gtk+
- From: Behdad Esfahbod <behdad behdad org>
- To: David Zeuthen <david fubar dk>
- Cc: gtk-devel-list gnome org
- Subject: Re: Units and resolution independence for gtk+
- Date: Wed, 06 Aug 2008 20:08:41 -0400
On Wed, 2008-08-06 at 19:42 -0400, David Zeuthen wrote:
>
> > Also, my only quick feedback is that you are hooking up on the font
> > size, while you should instead hook on screen dpi. Think of screen dpi
> > as a global scaling factor, and font size is relative size of the fonts
> > to the other elements.
>
> Actually the way it works right now is that it hooks up to both dpi and
> font size; here's the relevant part
>
> /* pango_size is in points; 10 points at 96 DPI is 12 pixels; convert accordingly */
> pixels_per_em = 1.2 * (dpi_to_use * (((gdouble) pango_size) / PANGO_SCALE) / 96.0);
>
> and pango_size (e.g. the result of pango_font_description_get_size())
> doesn't change when the DPI changes (and it shouldn't "point size" is an
> abstract concept). Is this incorrect?
This is correct.
I think what I mean is that most of the UI should use units in points,
not in em's. That is, increasing font size should not necessarily
increase all UI elements. I can't think of any concrete cases though.
If you just use dpi though, (replace GTK_UNIT_ONE_TWELFTH_EM with
GTK_UNIT_POINT), then the font size can be used more purposefully: to
change text size relative to other UI, where in your current design,
there's not much point in having different font size and dpi.
Makes sense?
> David
>
--
behdad
http://behdad.org/
"Those who would give up Essential Liberty to purchase a little
Temporary Safety, deserve neither Liberty nor Safety."
-- Benjamin Franklin, 1759
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