I made a simple test by changing some lines in the ActionBar example in
the gtkmm tutorial. In file
https://git.gnome.org/browse/gtkmm-documentation/tree/examples/book/actionbar/examplewindow.cc
I replaced
m_face_image.set_from_icon_name("face-cool", Gtk::ICON_SIZE_DIALOG);
by
Cairo::RefPtr<Cairo::ImageSurface> isurface =
Cairo::ImageSurface::create_from_png("rain.png");
m_face_image.set(isurface);
It works! The umbrella is shown. (rain.png comes from another example in
the tutorial.)
Can you please show a complete, but small, program that does not work.
Kjell
Den 2015-07-25 07:59, Adam Nielsen skrev:
Hi all,
I'm trying to display a static image in a Gtk::Image widget. I have
the image as a Cairo::ImageSurface, so I assumed I could call
Gtk::Image::set(surface) however this does not work - the widget
changes from the "missing image" icon to blank (all white.)
If instead I call Gdk::Pixbuf::create(surface, 0, 0, width, height) and
pass the resulting Pixbuf to Gtk::Image::set() then it works.
I am wondering why the set() call works when I pass a Gdk::Pixbuf, but
not when I pass a Cairo::Surface?
Passing the Cairo::Surface is easier for me (don't have to have code to
retrieve image dimensions) so I'd rather do that if I can.
auto cimg = Cairo::ImageSurface::create(...);
...
Glib::RefPtr<Gtk::Image> ctImage = ...
// This works
//ctImage->set(Gdk::Pixbuf::create(cimg, 0, 0, width, height));
// This doesn't work - why?
ctImage->set(cimg);
Many thanks,
Adam.
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