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audiovisualwaveform: optimize shifting code

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This commit is contained in:
itsmattkc
2021-05-30 12:55:50 +10:00
parent 69009180ab
commit 7e62ad4e10
1 changed files with 5 additions and 6 deletions
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app/audio/audiovisualwaveform.cpp
+5 -6
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@@ -184,9 +184,7 @@ void AudioVisualWaveform::Shift(const rational &from, const rational &to)
// Shifting backwards <-
int copy_sz = data.size() - from_index;
for (int i=0; i<copy_sz; i++) {
data.replace(to_index + i, data.at(from_index + i));
}
memcpy(&data.data()[to_index], &data.data()[from_index], copy_sz * sizeof(SamplePerChannel));
data.resize(data.size() - (from_index - to_index));
} else {
@@ -199,9 +197,10 @@ void AudioVisualWaveform::Shift(const rational &from, const rational &to)
int copy_sz = old_sz - from_index;
for (int i=0; i<copy_sz; i++) {
data.replace(data.size() - i - 1, data.at(old_sz - i - 1));
}
// Copy to a temporary buffer first to prevent overwriting bytes we need to copy
QByteArray temp(copy_sz * sizeof(SamplePerChannel), Qt::Uninitialized);
memcpy(temp.data(), &data.data()[from_index], temp.size());
memcpy(&data.data()[to_index], temp.data(), temp.size());
memset(reinterpret_cast<char*>(&data[from_index]), 0, distance * sizeof(SamplePerChannel));
}