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midi region view: fix crashes when adding notes 

A region may have no notes, or none in the correct time range. Finding
a note to get channel or velocity info from may fail
This commit is contained in:
Paul Davis 2021-11-18 10:03:34 -07:00
parent 252ae56a08
commit bc6766fc3f
1 changed files with 25 additions and 9 deletions
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34
gtk2_ardour/midi_region_view.cc
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@ -4261,9 +4261,17 @@ MidiRegionView::get_channel_for_add (MidiModel::TimeType time) const
}
/* second, use the nearest note in the region-view (consistent with get_velocity_for_add behavior) */
if (!_model->notes().empty()) {
MidiModel::Notes::const_iterator m = _model->note_lower_bound(time);
return (*m)->channel();
if (m == _model->notes().begin()) {
// Before the start, use the channel of the first note
return (*m)->channel();
} else if (m == _model->notes().end()) {
// Past the end, use the channel of the last note
--m;
return (*m)->channel();
}
}
/* lastly: query the track's channel filter */
@ -4284,17 +4292,25 @@ MidiRegionView::get_velocity_for_add (MidiModel::TimeType time) const
return editor.draw_velocity();
}
if (_model->notes().empty()) {
if (_model->notes().size() < 2) {
return 0x40; // No notes, use default
}
MidiModel::Notes::const_iterator m = _model->note_lower_bound(time);
if (m == _model->notes().begin()) {
// Before the start, use the velocity of the first note
return (*m)->velocity();
} else if (m == _model->notes().end()) {
// Past the end, use the velocity of the last note
--m;
MidiModel::Notes::const_iterator m = _model->notes().end();
if (!_model->notes().empty()) {
m = _model->note_lower_bound(time);
if (m == _model->notes().begin()) {
// Before the start, use the velocity of the first note
return (*m)->velocity();
} else if (m == _model->notes().end()) {
// Past the end, use the velocity of the last note
--m;
return (*m)->velocity();
}
}
if (_model->notes().size() == 1) {
return (*m)->velocity();
}