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Cache spectrogram pixmaps

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Mike Walters
2015-09-13 20:47:32 +01:00
parent ac9d703978
commit d6ff4b2df2
2 changed files with 39 additions and 24 deletions
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59
spectrogram.cpp
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@@ -62,40 +62,51 @@ void Spectrogram::paintEvent(QPaintEvent *event)
if (inputSource != nullptr) {
int height = rect.height();
int tileLine = linesPerTile();
int y = rect.y();
QImage image(fftSize, height, QImage::Format_RGB32);
float *tile;
for (int y = 0; y < height; y++) {
if (tileLine >= linesPerTile()) {
int line = rect.y() + y;
tileLine = line % linesPerTile();
off_t tileId = lineToSample(line - tileLine);
tile = getTile(tileId);
}
float *line = &tile[tileLine * fftSize];
for (int x = 0; x < fftSize; x++) {
float powerRange = std::abs(int(powerMin - powerMax)); // Cast to remove overload ambiguity
float normPower = (line[x] - powerMax) * -1.0f / powerRange;
normPower = clamp(normPower, 0.0f, 1.0f);
image.setPixel(x, y, colormap[(uint8_t)(normPower * (256 - 1))]);
}
tileLine++;
while (height > 0) {
int tileOffset = y % linesPerTile(); // To handle drawing a partial first tile
int drawHeight = std::min(linesPerTile() - tileOffset, height); // Draw rest of first tile, full tile, or partial final tile
off_t tileId = lineToSample(y - tileOffset);
QPixmap *tile = getPixmapTile(tileId);
painter.drawPixmap(QRect(0, y, fftSize, drawHeight), *tile, QRect(0, tileOffset, fftSize, drawHeight));
y += drawHeight;
height -= drawHeight;
}
QPixmap pixmap = QPixmap::fromImage(image);
painter.drawPixmap(QRect(0, rect.y(), fftSize, height), pixmap);
paintTimeAxis(&painter, rect);
}
qDebug() << "Paint: " << timer.elapsed() << "ms";
}
float* Spectrogram::getTile(off_t tile)
QPixmap* Spectrogram::getPixmapTile(off_t tile)
{
QPixmap *obj = pixmapCache.object(TileCacheKey(fftSize, zoomLevel, tile));
if (obj != 0)
return obj;
float *fftTile = getFFTTile(tile);
obj = new QPixmap(fftSize, linesPerTile());
QImage image(fftSize, linesPerTile(), QImage::Format_RGB32);
for (int y = 0; y < linesPerTile(); y++) {
float *line = &fftTile[y * fftSize];
for (int x = 0; x < fftSize; x++) {
float powerRange = std::abs(int(powerMin - powerMax));
float normPower = (line[x] - powerMax) * -1.0f / powerRange;
normPower = clamp(normPower, 0.0f, 1.0f);
image.setPixel(x, y, colormap[(uint8_t)(normPower * (256 - 1))]);
}
}
obj->convertFromImage(image);
pixmapCache.insert(TileCacheKey(fftSize, zoomLevel, tile), obj);
return obj;
}
float* Spectrogram::getFFTTile(off_t tile)
{
float *obj = fftCache.object(TileCacheKey(fftSize, zoomLevel, tile));
if (obj != 0)
@@ -178,12 +189,14 @@ void Spectrogram::setFFTSize(int size)
void Spectrogram::setPowerMax(int power)
{
powerMax = power;
pixmapCache.clear();
update();
}
void Spectrogram::setPowerMin(int power)
{
powerMin = power;
pixmapCache.clear();
update();
}