Allow negative return in TempoMap::beat_at_frame() and its exact_ variant.

[ardour.git] / gtk2_ardour / step_editor.cc

diff --git a/gtk2_ardour/step_editor.cc b/gtk2_ardour/step_editor.cc
index 3ea3bb4ccd6cd99427a07c8a18edc11152adcf15..c45c0f4461392b9c6c4ab5b57f316fefb5aa49d4 100644 (file)
--- a/gtk2_ardour/step_editor.cc
+++ b/gtk2_ardour/step_editor.cc
@@ -117,7 +117,7 @@ StepEditor::prepare_step_edit_region ()
 
                const Meter& m = _mtv.session()->tempo_map().meter_at_frame (step_edit_insert_position);
 
-               double baf = _mtv.session()->tempo_map().beat_at_frame (step_edit_insert_position);
+               double baf = max (0.0, _mtv.session()->tempo_map().beat_at_frame (step_edit_insert_position));
                double next_bar_in_beats =  baf + m.divisions_per_bar();
                framecnt_t next_bar_pos = _mtv.session()->tempo_map().frame_at_beat (next_bar_in_beats);
                framecnt_t len = next_bar_pos - step_edit_insert_position;