Hi,
I'm trying to set a "surface" property on Gtk::CellRendererPixbuf
and getting a gtk error:
"unable to set property 'surface' of type 'CairoSurface' from value of type
'glibmm__CustomBoxed_N5Cairo6RefPtrINS_7SurfaceEEE'"
This is the code:
-------------------------------------------
class GscMainWindowIconView : public Gtk::IconView {
Gtk::CellRendererPixbuf cell_renderer_pixbuf;
// ...
GscMainWindowIconView()
{
//...
this->pack_start(cell_renderer_pixbuf, false);
this->set_cell_data_func(cell_renderer_pixbuf,
sigc::mem_fun(this, &GscMainWindowIconView::on_cell_data));
}
void on_cell_data(const Gtk::TreeModel::const_iterator& iter)
{
Gtk::TreeRow row = *iter;
Glib::RefPtr<Gdk::Pixbuf> pixbuf = row[col_pixbuf];
// I couldn't find the gtkmm version of
gdk_cairo_surface_create_from_pixbuf(),
// that's why I create the surface this way.
Cairo::Format format = Cairo::FORMAT_ARGB32;
if (pixbuf->get_n_channels() == 3) {
format = Cairo::FORMAT_RGB24;
}
Cairo::RefPtr<Cairo::Surface> surface =
get_window()->create_similar_image_surface(
format, pixbuf->get_width(), pixbuf->get_height(),
get_scale_factor());
// THIS IS THE PROBLEM
cell_renderer_pixbuf.property_surface().set_value(surface);
}
}
-------------------------------------------
Note that if I change Cairo surface creation and property setting
to C-style, everything works (although I'm not sure whether the "surface"
variable leaks? The docs don't mention):
cairo_surface_t* surface = gdk_cairo_surface_create_from_pixbuf(
pixbuf->gobj(), get_scale_factor(), get_window()->gobj());
g_object_set(G_OBJECT(cell_renderer_pixbuf.gobj()), "surface", surface, NULL);
This all comes from trying to port the code from this bug report:
https://bugzilla.gnome.org/show_bug.cgi?id=765167#c5
Thanks,
Alexander
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