stop using gkd_pango_context_get() in ArdourCanvas::Canvas and require concrete instances to supply a Pango::Context; do this for GtkCanvas and Push2Canvas

libs/canvas/canvas.cc

@@ -1259,6 +1259,12 @@ GtkCanvas::hide_tooltip ()
 	}
 }
 
+Glib::RefPtr<Pango::Context>
+GtkCanvas::get_pango_context ()
+{
+	return Glib::wrap (gdk_pango_context_get());
+}
+
 /** Create a GtkCanvaSViewport.
  *  @param hadj Adjustment to use for horizontal scrolling.
  *  @param vadj Adjustment to use for vertica scrolling.

libs/canvas/canvas/canvas.h

@@ -43,6 +43,10 @@ namespace Gtk {
 	class Label;
 }
 
+namespace Pango {
+	class Context;
+}
+
 namespace ArdourCanvas
 {
 struct Rect;
@@ -154,7 +158,9 @@ public:
 	 */
 	static void set_tooltip_timeout (uint32_t msecs);
 
-protected:
+	virtual Glib::RefPtr<Pango::Context> get_pango_context() = 0;
+
+  protected:
 	Root  _root;
         Color _bg_color;
 
@@ -195,7 +201,9 @@ public:
 	void start_tooltip_timeout (Item*);
 	void stop_tooltip_timeout ();
 
-protected:
+	Glib::RefPtr<Pango::Context> get_pango_context();
+
+  protected:
 	void on_size_allocate (Gtk::Allocation&);
 	bool on_scroll_event (GdkEventScroll *);
 	bool on_expose_event (GdkEventExpose *);

libs/canvas/text.cc

@@ -106,7 +106,8 @@ void
 Text::_redraw () const
 {
 	assert (!_text.empty());
-	Glib::RefPtr<Pango::Context> context = Glib::wrap (gdk_pango_context_get());
+	assert (_canvas);
+	Glib::RefPtr<Pango::Context> context = _canvas->get_pango_context();
 	Glib::RefPtr<Pango::Layout> layout = Pango::Layout::create (context);
 
 #ifdef __APPLE__

libs/surfaces/push2/canvas.cc

@@ -17,11 +17,15 @@
 
 */
 
+#include <vector>
+
 #include <cairomm/region.h>
 #include <cairomm/surface.h>
 #include <cairomm/context.h>
 
 #include "pbd/compose.h"
+#include "pbd/error.h"
+#include "pbd/i18n.h"
 
 #include "ardour/debug.h"
 
@@ -233,3 +237,26 @@ Push2Canvas::visible_area () const
 	/* may need to get more sophisticated once we do scrolling */
 	return Rect (0, 0, 960, 160);
 }
+
+Glib::RefPtr<Pango::Context>
+Push2Canvas::get_pango_context ()
+{
+	if (!pango_context) {
+		PangoFontMap* map = pango_cairo_font_map_get_default ();
+		if (!map) {
+			error << _("Default Cairo font map is null!") << endmsg;
+			return Glib::RefPtr<Pango::Context> ();
+		}
+
+		PangoContext* context = pango_font_map_create_context (map);
+
+		if (!context) {
+			error << _("cannot create new PangoContext from cairo font map") << endmsg;
+			return Glib::RefPtr<Pango::Context> ();
+		}
+
+		pango_context = Glib::wrap (context);
+	}
+
+	return pango_context;
+}

libs/surfaces/push2/canvas.h

@@ -69,6 +69,8 @@ class Push2Canvas : public ArdourCanvas::Canvas
 	void pick_current_item (ArdourCanvas::Duple const &, int) {}
 	bool get_mouse_position (ArdourCanvas::Duple&) const { return false; }
 
+	Glib::RefPtr<Pango::Context> get_pango_context ();
+
   private:
 	Push2& p2;
 	int _cols;
@@ -83,6 +85,7 @@ class Push2Canvas : public ArdourCanvas::Canvas
 	Cairo::RefPtr<Cairo::ImageSurface> frame_buffer;
 	Cairo::RefPtr<Cairo::Context> context;
 	Cairo::RefPtr<Cairo::Region> expose_region;
+	Glib::RefPtr<Pango::Context> pango_context;
 
 	bool expose ();
 	int blit_to_device_frame_buffer ();