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spectrogram: Use image.scanLine for more speedup

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Also swap the loop axes so that using scanLine can work
This commit is contained in:
Mike Walters
2016-06-04 16:23:02 +01:00
parent 702dffe441
commit 4504736604
1 changed files with 6 additions and 5 deletions
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11
spectrogramplot.cpp
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@@ -98,13 +98,14 @@ QPixmap* SpectrogramPlot::getPixmapTile(off_t tile)
obj = new QPixmap(linesPerTile(), fftSize);
QImage image(linesPerTile(), fftSize, QImage::Format_RGB32);
float powerRange = -1.0f / std::abs(int(powerMin - powerMax));
for (int x = 0; x < linesPerTile(); x++) {
float *line = &fftTile[x * fftSize];
for (int y = 0; y < fftSize; y++) {
float normPower = (line[y] - powerMax) * powerRange;
for (int y = 0; y < fftSize; y++) {
auto scanLine = (QRgb*)image.scanLine(fftSize - y - 1);
for (int x = 0; x < linesPerTile(); x++) {
float *fftLine = &fftTile[x * fftSize];
float normPower = (fftLine[y] - powerMax) * powerRange;
normPower = clamp(normPower, 0.0f, 1.0f);
image.setPixel(x, fftSize - y - 1, colormap[(uint8_t)(normPower * (256 - 1))]);
scanLine[x] = colormap[(uint8_t)(normPower * (256 - 1))];
}
}
obj->convertFromImage(image);