Re: Rendering text with an outline

[Dov Grobgeld <dov.grobgeld@xxxxxxxxx>]

Note that it is not completely trivial to use pango_show_layout_line instead of pango_show_layout as they have different anchor points. pango_show_layout draws with the current point at the upper logical extent of the layout, and pango_show_layout_line draws with respect to the baseline of the text. See:

http://live.gnome.org/PangoLayoutLineBbox

Thus it does not make sense to create a binding for just one of them.

Regards,
Dov

2009/3/7 Chris Vine <chris@xxxxxxxxxxxxxxxxxxxxx>

On Fri, 06 Mar 2009 12:14:53 +0100
Christian Schaubschlaeger <cs@xxxxxxxxxxxxxxxxxx> wrote:
> Dov Grobgeld schrieb:
> > I cleaned up my example a bit and put it in GnomeLive. See:
> >
> > http://live.gnome.org/OutlineLabel
>
> Thanks for the example!
> I'm just trying to port it to gtkmm. Unfortunately I
> cannot find the corresponding C++ construct for the
> "Pango.cairo_show_layout()" call in Dov's Vala code.
> Would that be a pangocairo function? I could not find
> C++ bindings for the pangocairo lib. Are there any?
> However, I'm not sure if the code snippet below is
> correct at all, I'm (unfortunately) new to Pango and
> Cairo...
>
> Thanks and best regards
> Christian
>
> bool
> OutlineLabel::on_expose(GdkEventExpose *event)
> {
>     //Gdk::cairo_create(this->window);
>     Cairo::RefPtr<Cairo::ImageSurface> surface;
>     Cairo::RefPtr<Cairo::Context> cr;
>     Glib::RefPtr<Pango::Layout> layout;
>     int width,height;
>
>     layout = this->get_layout();
>     width = -1; height = -1;
>     layout->get_size(width,height);
>
>     surface = Cairo::ImageSurface::create(Cairo::FORMAT_ARGB32,
> width, height); cr = Cairo::Context::create(surface);
>     cr->move_to((this->get_allocation().get_width()-width/Pango::SCALE)/2,0);
>     cr->set_sorce_rgba(1,0,0,1);
>
>     // in VALA: Pango.cairo_show_layout(cr,layout);
>     // in C++?
>     ...
>
> }

pango_cairo_show_layout() does not appear to be wrapped, but
pango_cairo_show_layout_line() is (as
Pango::LayoutLine::show_in_cairo_context()), so I suggest you use that
with Pango::Layout::get_line() and/or Pango::Layout::get_lines().

Chris

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