ardour/livetrax
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Provide an image if there are no peaks.

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This commit is contained in:
nick_m 2015-03-22 00:31:32 +11:00
parent 0f2ead3d6b
commit 69a6c4d747
2 changed files with 40 additions and 2 deletions
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1
libs/canvas/canvas/wave_view.h
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@ -203,6 +203,7 @@ private:
void get_image (Cairo::RefPtr<Cairo::ImageSurface>& image, framepos_t start, framepos_t end, double& image_offset) const;
ArdourCanvas::Coord y_extent (double, bool) const;
void draw_absent_image (Cairo::RefPtr<Cairo::ImageSurface>&, ARDOUR::PeakData*, int) const;
void draw_image (Cairo::RefPtr<Cairo::ImageSurface>&, ARDOUR::PeakData*, int) const;
};

41
libs/canvas/wave_view.cc
View File

@ -349,6 +349,38 @@ WaveView::y_extent (double s, bool /*round_to_lower_edge*/) const
}
}
void
WaveView::draw_absent_image (Cairo::RefPtr<Cairo::ImageSurface>& image, PeakData* _peaks, int n_peaks) const
{
Cairo::RefPtr<Cairo::ImageSurface> stripe = Cairo::ImageSurface::create (Cairo::FORMAT_A8, n_peaks, _height);
Cairo::RefPtr<Cairo::Context> stripe_context = Cairo::Context::create (stripe);
stripe_context->set_antialias (Cairo::ANTIALIAS_NONE);
uint32_t stripe_separation = 150;
double start = - floor (_height / stripe_separation) * stripe_separation;
int stripe_x = 0;
while (start < n_peaks) {
stripe_context->move_to (start, 0);
stripe_x = start + _height;
stripe_context->line_to (stripe_x, _height);
start += stripe_separation;
}
stripe_context->set_source_rgba (1.0, 1.0, 1.0, 1.0);
stripe_context->set_line_cap (Cairo::LINE_CAP_SQUARE);
stripe_context->set_line_width(50);
stripe_context->stroke();
Cairo::RefPtr<Cairo::Context> context = Cairo::Context::create (image);
context->set_source_rgba (1.0, 1.0, 0.0, 0.3);
context->mask (stripe, 0, 0);
context->fill ();
}
struct LineTips {
double top;
double bot;
@ -761,14 +793,19 @@ WaveView::get_image (Cairo::RefPtr<Cairo::ImageSurface>& image, framepos_t start
boost::scoped_array<ARDOUR::PeakData> peaks (new PeakData[n_peaks]);
_region->read_peaks (peaks.get(), n_peaks,
framecnt_t peaks_read;
peaks_read = _region->read_peaks (peaks.get(), n_peaks,
sample_start, sample_end - sample_start,
_channel,
_samples_per_pixel);
image = Cairo::ImageSurface::create (Cairo::FORMAT_ARGB32, n_peaks, _height);
draw_image (image, peaks.get(), n_peaks);
if (peaks_read > 0) {
draw_image (image, peaks.get(), n_peaks);
} else {
draw_absent_image (image, peaks.get(), n_peaks);
}
_image_cache[_region->audio_source ()].push_back (CacheEntry (_channel, _height, _region_amplitude, _fill_color, sample_start, sample_end, image));