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Tempo marker movement snaps to the future grid, rather than the current one.

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- fixes jittery tempo movement when snapping within large gradients.
This commit is contained in:
nick_m 2016-08-24 03:38:46 +10:00
parent 9a66e1e2c6
commit 88f723e8d8
1 changed files with 36 additions and 19 deletions
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41
libs/ardour/tempo.cc
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@ -2774,43 +2774,60 @@ void
TempoMap::gui_move_tempo (TempoSection* ts, const framepos_t& frame, const int& sub_num) TempoMap::gui_move_tempo (TempoSection* ts, const framepos_t& frame, const int& sub_num)
{ {
Metrics future_map; Metrics future_map;
bool was_musical = ts->position_lock_style() == MusicTime;
if (sub_num == 0 && was_musical) {
/* if we're not snapping to music,
AudioTime and MusicTime may be treated identically.
*/
ts->set_position_lock_style (AudioTime);
}
if (ts->position_lock_style() == MusicTime) { if (ts->position_lock_style() == MusicTime) {
{ {
/* if we're snapping to a musical grid, set the pulse exactly instead of via the supplied frame. */ /* if we're snapping to a musical grid, set the pulse exactly instead of via the supplied frame. */
Glib::Threads::RWLock::WriterLock lm (lock); Glib::Threads::RWLock::WriterLock lm (lock);
TempoSection* tempo_copy = copy_metrics_and_point (_metrics, future_map, ts); TempoSection* tempo_copy = copy_metrics_and_point (_metrics, future_map, ts);
tempo_copy->set_position_lock_style (AudioTime);
if (solve_map_frame (future_map, tempo_copy, frame)) {
const double beat = exact_beat_at_frame_locked (future_map, frame, sub_num); const double beat = exact_beat_at_frame_locked (future_map, frame, sub_num);
double pulse = pulse_at_beat_locked (future_map, beat); const double pulse = pulse_at_beat_locked (future_map, beat);
if (solve_map_pulse (future_map, tempo_copy, pulse)) { if (solve_map_pulse (future_map, tempo_copy, pulse)) {
solve_map_pulse (_metrics, ts, pulse); solve_map_pulse (_metrics, ts, pulse);
recompute_meters (_metrics); recompute_meters (_metrics);
} }
} }
}
} else { } else {
{ {
Glib::Threads::RWLock::WriterLock lm (lock); Glib::Threads::RWLock::WriterLock lm (lock);
TempoSection* tempo_copy = copy_metrics_and_point (_metrics, future_map, ts); TempoSection* tempo_copy = copy_metrics_and_point (_metrics, future_map, ts);
if (solve_map_frame (future_map, tempo_copy, frame)) { if (solve_map_frame (future_map, tempo_copy, frame)) {
if (sub_num != 0) {
/* We're moving the object that defines the grid while snapping to it...
* Placing the ts at the beat corresponding to the requested frame may shift the
* grid in such a way that the mouse is left hovering over a completerly different division,
* causing jittering when the mouse next moves (esp. large tempo deltas).
* To avoid this, place the ts at the requested frame in a dummy map
* then find the closest beat subdivision to that frame in the dummy.
* This alters the snap behaviour slightly in that we snap to beat divisions
* in the future map rather than the existing one.
*/
const double beat = exact_beat_at_frame_locked (future_map, frame, sub_num);
const double pulse = pulse_at_beat_locked (future_map, beat);
if (solve_map_pulse (future_map, tempo_copy, pulse)) {
/* snapping to a grid. force MusicTime temporarily. */
ts->set_position_lock_style (MusicTime);
solve_map_pulse (_metrics, ts, pulse);
ts->set_position_lock_style (AudioTime);
recompute_meters (_metrics);
}
} else {
solve_map_frame (_metrics, ts, frame); solve_map_frame (_metrics, ts, frame);
recompute_meters (_metrics); recompute_meters (_metrics);
} }
} }
} }
if (sub_num == 0 && was_musical) {
ts->set_position_lock_style (MusicTime);
} }
Metrics::const_iterator d = future_map.begin(); Metrics::const_iterator d = future_map.begin();