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NO-OP: add some explanatory comments to Editor::snap_to_bbt()

This commit is contained in:
Paul Davis 2022-11-29 09:32:41 -07:00
parent 21c6c723c4
commit f2a725b311
1 changed files with 18 additions and 0 deletions
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18
gtk2_ardour/editor.cc
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@ -2951,6 +2951,10 @@ Editor::snap_to_bbt (timepos_t const & presnap, Temporal::RoundMode direction, S
if (gpref != SnapToGrid_Unscaled) { // use the visual grid lines which are limited by the zoom scale that the user selected
/* Determine the most obvious divisor of a beat to use
* for the snap, based on the grid setting.
*/
int divisor;
switch (_grid_type) {
case GridTypeBeatDiv3:
@ -2980,6 +2984,16 @@ Editor::snap_to_bbt (timepos_t const & presnap, Temporal::RoundMode direction, S
break;
};
/* bbt_ruler_scale reflects the level of detail we will show
* for the visual grid. Adjust the "natural" divisor to reflect
* this level of detail, and snap to that.
*
* So, for example, if the grid is Div3, we use 3 divisions per
* beat, but if the visual grid is using bbt_show_sixteenths (a
* fairly high level of detail), we will snap to (2 * 3)
* divisions per beat. Etc.
*/
BBTRulerScale scale = bbt_ruler_scale;
switch (scale) {
case bbt_show_many:
@ -3011,6 +3025,10 @@ Editor::snap_to_bbt (timepos_t const & presnap, Temporal::RoundMode direction, S
break;
}
} else {
/* Just use the grid as specified, without paying attention to
* zoom level
*/
ret = timepos_t (tmap->quarters_at (presnap).round_to_subdivision (get_grid_beat_divisions(_grid_type), direction));
}