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initial semi-working attempt at getting waveview cache to work correctly

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This commit is contained in:
Paul Davis 2013-06-18 23:03:20 -04:00
parent aaaeb958c1
commit 79384aeb66
2 changed files with 102 additions and 85 deletions
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45
libs/canvas/canvas/wave_view.h
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@ -51,6 +51,25 @@ public:
Rectified,
};
/* Displays a single channel of waveform data for the given Region.
x = 0 in the waveview corresponds to the first waveform datum taken
from region->start() samples into the source data.
x = N in the waveview corresponds to the (N * spp)'th sample
measured from region->start() into the source data.
when drawing, we will map the zeroth-pixel of the waveview
into a window.
The waveview itself contains a set of pre-rendered Cairo::ImageSurfaces
that cache sections of the display. This is filled on-demand and
never cleared until something explicitly marks the cache invalid
(such as a change in samples_per_pixel, the log scaling, rectified or
other view parameters).
*/
WaveView (Group *, boost::shared_ptr<ARDOUR::AudioRegion>);
void render (Rect const & area, Cairo::RefPtr<Cairo::Context>) const;
@ -122,15 +141,23 @@ private:
class CacheEntry
{
public:
CacheEntry (WaveView const *, double, double, int);
CacheEntry (WaveView const *, double, double);
~CacheEntry ();
double start () const {
return _start;
double pixel_start () const {
return _pixel_start;
}
double end () const {
return _end;
double pixel_end () const {
return _pixel_end;
}
double sample_start () const {
return _sample_start;
}
double sample_end () const {
return _sample_end;
}
boost::shared_array<ARDOUR::PeakData> peaks () const {
@ -145,9 +172,11 @@ private:
WaveView const * _wave_view;
double _start;
double _end;
int _n_peaks;
double _pixel_start;
double _pixel_end;
ARDOUR::framecnt_t _sample_start;
ARDOUR::framecnt_t _sample_end;
int _n_peaks;
boost::shared_array<ARDOUR::PeakData> _peaks;
Cairo::RefPtr<Cairo::ImageSurface> _image;