void Spectrogram::paintEvent(QPaintEvent *event)
{
QElapsedTimer timer;
timer.start();
QRect rect = event->rect();
QPainter painter(this);
painter.fillRect(rect, Qt::black);
if (inputSource != nullptr) {
int height = rect.height();
int y = rect.y();
QImage image(fftSize, height, QImage::Format_RGB32);
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;
}
paintTimeAxis(&painter, rect);
}
qDebug() << "Paint: " << timer.elapsed() << "ms";
}
void Spectrogram::paintEvent(QPaintEvent *event)
{
QElapsedTimer timer;
timer.start();
QRect rect = event->rect();
QPainter painter(this);
painter.fillRect(rect, Qt::black);
if (inputSource != nullptr) {
int height = rect.height();
float *line = (float*)malloc(fftSize * sizeof(float));
QImage image(fftSize, height, QImage::Format_RGB32);
for (int y = 0; y < height; y++) {
getLine(line, rect.y() + y);
for (int x = 0; x < fftSize; x++) {
float powerRange = std::abs(powerMin - powerMax);
float normPower = (line[x] - powerMax) * -1.0f / powerRange;
normPower = clamp(normPower, 0.0f, 1.0f);
float red, green, blue;
HSVtoRGB(&red, &green, &blue, normPower * 300.0f, 1, 1 - normPower);
image.setPixel(x, y, qRgb(red * 255, green * 255, blue * 255));
}
}
QPixmap pixmap = QPixmap::fromImage(image);
painter.drawPixmap(QRect(0, rect.y(), fftSize, height), pixmap);
free(line);
paintTimeAxis(&painter, rect);
}
qDebug() << "Paint: " << timer.elapsed() << "ms";
}
