[cairo] Windows GTK+ 2.24.10: Cairo contexts not rendering to surface

[LRN]

On 22.01.2017 23:24, Jeffrey Sheen wrote:
> Dear list,
> 
> I'm trying to incorporate Cairo rendering into a cross-platform project.
> Windows XP is a target platform for the project, so I am building against the
> GTK+ 2.24.10 Bundle (20120208). N.B. This is a C/C++ implementation.
> 
> The problem I'm having is that no Cairo backend contexts are rendering pixels
> to their surfaces.
> 
> I've tried the examples on the Zetcode guides for a PNG image surface and GTK
> Window: http://zetcode.com/gfx/cairo/cairobackends/ 

These are for GTK3, i think. For GTK2 you need to do something like this:

...
  g_signal_connect(G_OBJECT(darea), "expose-event",
      G_CALLBACK(on_expose_event), NULL);
...

static gboolean
on_expose_event (GtkWidget      *widget,
                 GdkEventExpose *event,
                 gpointer        data)
{
  cairo_t *cr;

  cr = gdk_cairo_create (gtk_widget_get_window (widget));

  do_drawing (cr);

  cairo_destroy (cr);

  return FALSE;
}


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