Hi,
I am trying to follow your example to render another font variant: I need font with 2 colors and 1pixel shift in x,y between each color
that would create a shadow.
cairo_t *cr = gdk_cairo_create(widget->window);
PangoLayout *layout = gtk_label_get_layout(GTK_LABEL(widget));
int width=-1, height=-1;
pango_layout_get_size(layout, &width, &height);
/* add 1 pixel to x and y and draw white shadow */
cairo_move_to(cr, widget->allocation.x +
(widget->allocation.width - width / PANGO_SCALE) / 2 +1,
height / PANGO_SCALE / 2 +1);
cairo_set_source_rgb(cr, 1, 1, 1);
cairo_set_line_width(cr, 1.0);
pango_cairo_show_layout(cr, layout);
pango_cairo_layout_path(cr, layout);
cairo_stroke(cr);
/* draw black font */
cairo_set_source_rgb(cr, 0, 0, 0);
cairo_set_line_width(cr, 1.0);
cairo_move_to(cr, widget->allocation.x +
(widget->allocation.width - width / PANGO_SCALE) / 2,
height / PANGO_SCALE / 2);
cairo_set_line_join(cr, CAIRO_LINE_JOIN_BEVEL);
pango_cairo_layout_path(cr, layout);
cairo_stroke(cr);
the problem is that I get blurred fonts.
when I draw only one of the colors - the font looks blurred at the edges, I need all the pixels to be in the same color but what I get is
black in the middle and gray edges
when I draw the 2 colors one over the other - I get smudged font, looks line the white background emerges through the black foreground
I tried calling cairo_set_line_join with all options but I am probably missing something with the font definition
Thanks for your help,
Jonathan
2009/3/7 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>pango_cairo_show_layout() does not appear to be wrapped, butOn 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_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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