ardour/livetrax
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try to narrow down #6478

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This commit is contained in:
Robin Gareus 2016-02-27 23:16:05 +01:00
parent 6a52dc3219
commit 4cd77f0544
1 changed files with 9 additions and 0 deletions
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9
libs/canvas/wave_view.cc
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@ -987,6 +987,8 @@ WaveView::generate_image (boost::shared_ptr<WaveViewThreadRequest> req, bool in_
framepos_t sample_end = min (center + image_samples, region_end());
const int n_peaks = llrintf ((sample_end - sample_start)/ (req->samples_per_pixel));
assert (n_peaks > 0 && n_peaks < 32767);
boost::scoped_array<ARDOUR::PeakData> peaks (new PeakData[n_peaks]);
/* Note that Region::read_peaks() takes a start position based on an
@ -1000,6 +1002,13 @@ WaveView::generate_image (boost::shared_ptr<WaveViewThreadRequest> req, bool in_
req->samples_per_pixel);
req->image = Cairo::ImageSurface::create (Cairo::FORMAT_ARGB32, n_peaks, req->height);
// http://cairographics.org/manual/cairo-Image-Surfaces.html#cairo-image-surface-create
// This function always returns a valid pointer, but it will return a pointer to a "nil" surface..
// but there's some evidence that req->image can be NULL.
// http://tracker.ardour.org/view.php?id=6478
assert (req->image);
/* make sure we record the sample positions that were actually used */
req->start = sample_start;
req->end = sample_end;