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Bug1005: draw tool performance

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This commit is contained in:
Paul Licameli 2015-06-03 01:51:16 -04:00
parent 6faf4c98c1
commit 00ab193246
1 changed files with 14 additions and 19 deletions
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35
src/TrackPanel.cpp
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@ -5195,28 +5195,23 @@ void TrackPanel::HandleSampleEditingDrag( wxMouseEvent & event )
const float newLevel = FindSampleEditingLevel(event, t0);
//Now, redraw all samples between current and last redrawn sample
float tmpvalue;
//Handle cases of 0 or 1 special, to improve speed
//JKC I don't think this makes any noticeable difference to speed
// whatsoever! The real reason for the special case is probably to
// avoid division by zero....
#define LLABS(n) ((n) < 0 ? -(n) : (n))
if(LLABS(s0 - mDrawingLastDragSample) <= 1){
mDrawingTrack->Set((samplePtr)&newLevel, floatSample, s0, 1);
}
else
{
//Now, redraw all samples between current and last redrawn sample, inclusive
//Go from the smaller to larger sample.
int start = wxMin( s0, mDrawingLastDragSample) +1;
int end = wxMax( s0, mDrawingLastDragSample);
for(sampleCount i= start; i<= end; i++) {
//This interpolates each sample linearly:
tmpvalue=mDrawingLastDragSampleValue + (newLevel - mDrawingLastDragSampleValue) *
(float)(i-mDrawingLastDragSample)/(s0-mDrawingLastDragSample );
mDrawingTrack->Set((samplePtr)&tmpvalue, floatSample, i, 1);
const int start = std::min( s0, mDrawingLastDragSample);
const int end = std::max( s0, mDrawingLastDragSample);
const int size = end - start + 1;
if (size == 1) {
mDrawingTrack->Set((samplePtr)&newLevel, floatSample, start, size);
}
else {
std::vector<float> values(size);
for (sampleCount i = start; i <= end; ++i) {
//This interpolates each sample linearly:
values[i - start] =
mDrawingLastDragSampleValue + (newLevel - mDrawingLastDragSampleValue) *
(float)(i - mDrawingLastDragSample) / (s0 - mDrawingLastDragSample);
}
mDrawingTrack->Set((samplePtr)&values[0], floatSample, start, size);
}
//Update the member data structures.