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Use same rounding for wave-view rectangle as TAV

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Previously the waveform could exceed the AudioRegionView's
Rectangle on either side due to rounding.

```
round ((start - end) / spp) != round (start/spp) - round (end/spp)
```
This commit is contained in:
Robin Gareus 2024-11-28 14:50:34 +01:00
parent aed4c9815a
commit 911399f8b3
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GPG key ID: A090BCE02CF57F04
1 changed files with 20 additions and 4 deletions
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24
libs/waveview/wave_view.cc
View file

@ -302,11 +302,24 @@ WaveView::get_item_and_draw_rect_in_window_coords (Rect const& canvas_rect, Rect
* So let's start by determining the area covered by the region, in
* window coordinates. It begins at zero (in item coordinates for this
* waveview, and extends to region_length() / _samples_per_pixel.
*
* Use same rounding as UI's TimeAxisViewItem::set_samples_per_pixel,
* TimeAxisViewItem::reset_width_dependent_items
*/
double spp = _props->samples_per_pixel;
double end_pixel = round ((_region->position () + _region->length ()).samples () / spp);
double start_pixel = round (_region->position ().samples () / spp);
double const width = end_pixel - start_pixel;
double const width = region_length() / _props->samples_per_pixel;
item_rect = item_to_window (Rect (0.0, 0.0, width, _props->height), false);
/* do round actual start/end clip-mask, to match TimeAxisViewItem frame */
double rx0 = round (item_rect.x0);
double rx1 = round (item_rect.x1);
/* don't round item, this way sample-positions from pixels remain consistent
* (waveform does not jitter when region is split)
*/
item_rect.x0 = floor (item_rect.x0);
item_rect.x1 = ceil (item_rect.x1);
item_rect.y0 = round (item_rect.y0);
@ -326,8 +339,8 @@ WaveView::get_item_and_draw_rect_in_window_coords (Rect const& canvas_rect, Rect
* We round down in case we were asked to draw "between" pixels at the start
* and/or end.
*/
draw_rect.x0 = floor (draw_rect.x0);
draw_rect.x1 = ceil (draw_rect.x1);
draw_rect.x0 = max (floor (draw_rect.x0), rx0);
draw_rect.x1 = min (ceil (draw_rect.x1), rx1);
return true;
}
@ -1153,7 +1166,10 @@ void
WaveView::compute_bounding_box () const
{
if (_region) {
_bounding_box = Rect (0.0, 0.0, region_length() / _props->samples_per_pixel, _props->height);
double spp = _props->samples_per_pixel;
double end_pixel = round ((_region->position () + _region->length ()).samples () / spp);
double start_start = round (_region->position ().samples () / spp);
_bounding_box = Rect (0.0, 0.0, end_pixel - start_start, _props->height);
} else {
_bounding_box = Rect ();
}