Re: Pango device units

["Pawel S. Veselov" <Pawel Veselov Sun COM>]

Owen,

Yeah, I'm aware of PANGO_SCALE being a multiplier between device
units and pango units, but it doesn't seem to me that the device
units are actually pixels. If I set a font, say "Sans 10" for
pango layout, or call the pango_font_description_set_size(desc, 10),
the pango_layout_get_pixel_size() returns like 14 for the height.

Basically, what I'm trying to do is to figure the largest font size
while fitting text in a box... If I keep scaling down until
pango_layout_get_pixel_size() returns the height I need, the
text becomes extremely small and unreadable...

Thanks,
    Pawel.

On Wed, Aug 27, 2003 at 11:23:06PM -0400, Owen Taylor wrote:
> On Wed, 2003-08-27 at 19:22, Pawel S. Veselov wrote:
> > Hi,
> >
> > a quick one.
> >
> > What's the ratio between pango device units (points)
> > and the actual number of pixels, and how to figure it out
> > programatically ?
>
> Pango units are basically a fixed point number - the
> scale is given by PANGO_SCALE (1024 as it happens).
>
> What a value of 1.0 * PANGO_SCALE means is up to the
> backend - the current backends all treat it as one pixel,
> but a Postscript background would probably use 1 point
> instead.
>
> There is a PANGO_PIXELS() macro round that more or less
> is:
>
> nearest_integer (val / PANGO_SCALE)
>
> To convert from a integer number of pixels to a pango,
> just multiple by PANGO_SCALE.
>
> Regards,
>                                       Owen

Bye.
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