Re: Copying widget layout into a cairo layout

[Behdad Esfahbod <behdad behdad org>]

The per-layout thing can be set using pango_cairo_context_set_resolution().

behdad

On 06/11/2009 11:36 AM, Zoltan Boszormenyi wrote:
> Hi,
>
> I found this call to work OK:
>
> pango_cairo_font_map_set_resolution(pango_cairo_font_map_get_default(),
>                        gdk_screen_get_resolution(gdk_screen_get_default()));
>
> But it seems to me that it's a global setting, not a per layout thing.
> I can't seem to get a PangoCairoFontMap out of a cairo_t.
>
> Thanks,
> Zoltán Böszörményi
>
> Behdad Esfahbod írta:
> > Humm, what happens if you get the PangoContext from the label, create
> > layout, and render to your own cairo_t?  Should work.
> >
> > behdad
> >
> > On 06/11/2009 09:56 AM, Zoltan Boszormenyi wrote:
> > > Hi,
> > >
> > > thanks very much, the font now is the same, but it's still a bit larger,
> > > see the attached picture. Is there some other option I can apply?
> > >
> > > Thanks in advance,
> > > Zoltán
> > >
> > > Behdad Esfahbod írta:
> > > > Try copying setting the font description of the label on your
> > > > PangoContext. widget->style->font_desc.
> > > >
> > > > On 06/11/2009 08:33 AM, Zoltan Boszormenyi wrote:
> > > > > Zoltan Boszormenyi írta:
> > > > > > Hi,
> > > > > >
> > > > > > I need to create a scrolling label widget.
> > > > > > I already succeeded marrying gtklabel and gtkimage,
> > > > > > I use a Cairo surface and created PangoLayout out of it,
> > > > > > I render the label text into the Cairo+Pango layout,
> > > > > > I use the expose method used by GtkImage to display
> > > > > > the pixbuf in the widget, and added a timer so the
> > > > > > pixbuf is scrolled in a double buffered way.
> > > > > >
> > > > > > Now, the problem is that the text rendered into the pixbuf
> > > > > > is much larger than the usual widget texts, like on stock
> > > > > > GtkButton and GtkLabel. I attached the screenshot from
> > > > > > my example application.
> > > > > >
> > > > > > How can I copy the PangoContext that a plain widget use?
> > > > > > E.g. the following code doesn't seem to work:
> > > > > >
> > > > > > =================================
> > > > > >      label->surface = cairo_image_surface_create_for_data(cairo_data,
> > > > > >                            CAIRO_FORMAT_ARGB32, width, height,
> > > > > > rowstride);
> > > > > >
> > > > > >      label->cairo = cairo_create (label->surface);
> > > > > >
> > > > > >      label->layout = pango_cairo_create_layout(label->cairo);
> > > > > >
> > > > > >      /* This is the layout used by GtkLabel, etc. */
> > > > > >      layout = gtk_widget_create_pango_layout (GTK_WIDGET (label),
> > > > > >                                  "This long string gives a good enough
> > > > > > length for any line to have.");
> > > > > >
> > > > > >      pango_cairo_context_set_font_options(
> > > > > >                pango_layout_get_context(label->layout),
> > > > > >
> > > > > > pango_cairo_context_get_font_options(pango_layout_get_context(layout)));
> > > > > >
> > > > > >
> > > > > >
> > > > > >      pango_cairo_update_context(label->cairo,
> > > > > > pango_layout_get_context(layout));
> > > > > >      pango_layout_context_changed(label->layout);
> > > > > >
> > > > > >      g_object_unref (layout);
> > > > > > =================================
> > > > > >
> > > > > > What is the proper way to get the same font, fontsize, etc. on a
> > > > > > Cairo
> > > > > > layout?
> > > > > >
> > > > > > Thanks in advance,
> > > > > > Zoltán Böszörményi
> > > > > The following code also doesn't work, I get the same large font
> > > > > for my GtkScrollLabel that my previously attached screenshot showed:
> > > > >
> > > > >      label->cairo = cairo_create (label->surface);
> > > > >      pango_cairo_update_context(label->cairo,
> > > > > gtk_widget_get_pango_context
> > > > > (GTK_WIDGET(label)));
> > > > >      label->layout = pango_cairo_create_layout(label->cairo);
> > > > >
> > > > > Is there and easy way to render the text in the same size as
> > > > > GtkLabel's default?
> > > > >
> > > > > Thanks in advance,
> > > > > Zoltán Böszörményi
> > > > >
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