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Code Issues Releases Wiki Activity

Rewrite WaveTrackView::GetSubViews to cache last computed heights

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This commit is contained in:
Paul Licameli 2019-07-11 12:50:00 -04:00
parent 125b8ad0da
commit af9959dc98
2 changed files with 24 additions and 11 deletions
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3
src/TrackPanel.cpp
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@ -923,6 +923,7 @@ void TrackPanel::UpdateTrackVRuler(Track *t)
for (auto channel : TrackList::Channels(t)) {
auto &view = TrackView::Get( *channel );
const auto height = view.GetHeight() - (kTopMargin + kBottomMargin);
rect.SetHeight( height );
const auto subViews = view.GetSubViews( rect );
if (subViews.empty())
continue;
@ -1142,7 +1143,7 @@ struct ChannelGroup final : TrackPanelGroup {
auto &view = TrackView::Get( *channel );
auto height = view.GetHeight();
rect.SetTop( yy );
rect.SetHeight( height );
rect.SetHeight( height - kSeparatorThickness );
const auto subViews = TrackView::Get( *channel ).GetSubViews( rect );
auto y1 = yy;
for ( const auto &subView : subViews ) {

32
src/tracks/playabletrack/wavetrack/ui/WaveTrackView.cpp
View File

@ -159,18 +159,20 @@ void WaveTrackView::SetDisplay(WaveTrackDisplay display)
auto WaveTrackView::GetSubViews( const wxRect &rect ) -> Refinement
{
// Collect the visible views
using Pair = std::pair< float, std::shared_ptr< TrackView > >;
Refinement results;
// Collect the visible views in the right sequence
using Pair = std::pair< float*, std::shared_ptr< TrackView > >;
std::vector< Pair > pairs( mPlacements.size() );
size_t ii = 0;
float total = 0;
WaveTrackSubViews::ForEach( [&]( WaveTrackSubView &subView ){
const auto &placement = mPlacements[ii];
auto &placement = mPlacements[ii];
auto index = placement.index;
auto fraction = placement.fraction;
auto &fraction = placement.fraction;
if ( index >= 0 && fraction > 0.0 )
total += fraction,
pairs[ index ] = { fraction, subView.shared_from_this() };
pairs[ index ] = { &fraction, subView.shared_from_this() };
++ii;
} );
@ -179,17 +181,27 @@ auto WaveTrackView::GetSubViews( const wxRect &rect ) -> Refinement
newEnd = std::remove_if( begin, end,
[]( const Pair &item ){ return !item.second; } );
pairs.erase( newEnd, end );
results.reserve( pairs.size() );
// Assign coordinates
Refinement results;
results.reserve( pairs.size() );
float partial = 0;
// Also update the stored placements, redenominating to the total height,
// storing integer values
const auto top = rect.GetTop();
const auto height = rect.GetHeight();
float partial = 0;
wxCoord lastCoord = 0;
float *lastFraction = nullptr;
for ( const auto &pair : pairs ) {
results.emplace_back( top + (partial / total) * height, pair.second );
partial += pair.first;
wxCoord newCoord = top + (partial / total) * height;
results.emplace_back( newCoord, pair.second );
partial += *pair.first;
if (lastFraction)
*lastFraction = newCoord - lastCoord;
lastFraction = pair.first;
lastCoord = newCoord;
}
if ( lastFraction )
*lastFraction = top + height - lastCoord;
return results;
}