circles and circles and circles, again my friend

escape the cairo vicious circle, fixes varispeed playback
& major CPU hog on OSX.

diff --git a/gtk2_ardour/shuttle_control.cc b/gtk2_ardour/shuttle_control.cc
index 5eacf3c93b9b8f619d3c47821075aecdf257e6b7..decff696ddd6022d98e17bf3c273e405b80b2caf 100644 (file)
--- a/gtk2_ardour/shuttle_control.cc
+++ b/gtk2_ardour/shuttle_control.cc
@@ -545,7 +545,7 @@ ShuttleControl::render (cairo_t* cr, cairo_rectangle_t*)
        } else if ( speed ==0.0 )
                rounded_rectangle (cr, offset, 4, marker_size-2, marker_size-2, 1);
        else
-               cairo_arc (cr, offset + marker_size*0.5, 2 + marker_size*0.5, marker_size*0.5, 0, 360);
+               cairo_arc (cr, offset + marker_size*0.5, 2 + marker_size*0.5, marker_size*0.5, 0, 2. * M_PI);
        cairo_set_line_width (cr, 2);
        cairo_stroke (cr);