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spectrogram: Fix bug with tile ID calculation that was causing lots of cache misses

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Mike Walters
2016-03-16 23:24:15 +00:00
parent aeffd64f97
commit 3735838292
1 changed files with 9 additions and 5 deletions
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14
spectrogramplot.cpp
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@@ -50,15 +50,19 @@ void SpectrogramPlot::paintMid(QPainter &painter, QRect &rect, range_t<off_t> sa
if (!inputSource || inputSource->count() == 0)
return;
off_t sampleOffset = sampleRange.minimum % getStride();
off_t sampleOffset = sampleRange.minimum % (getStride() * linesPerTile());
off_t tileID = sampleRange.minimum - sampleOffset;
int xoffset = sampleOffset / fftSize;
for (int x = rect.left(); x < rect.right(); x += linesPerTile()) {
QPixmap *tile = getPixmapTile(tileID);
// Paint first (possibly partial) tile
painter.drawPixmap(QRect(rect.left(), rect.y(), linesPerTile() - xoffset, fftSize), *getPixmapTile(tileID), QRect(xoffset, 0, linesPerTile() - xoffset, fftSize));
tileID += getStride() * linesPerTile();
// Paint remaining tiles
for (int x = linesPerTile() - xoffset; x < rect.right(); x += linesPerTile()) {
// TODO: don't draw past rect.right()
// TODO: handle partial final tile
painter.drawPixmap(QRect(x, rect.y(), linesPerTile() - xoffset, fftSize), *tile, QRect(xoffset, 0, linesPerTile() - xoffset, fftSize));
xoffset = 0;
painter.drawPixmap(QRect(x, rect.y(), linesPerTile(), fftSize), *getPixmapTile(tileID));
tileID += getStride() * linesPerTile();
}
}