bool QPainterRenderer::preparePixmap(const VideoFrame &frame)
{
DPTR_D(QPainterRenderer);
// already locked in a larger scope of receive()
QImage::Format imgfmt = frame.imageFormat();
if (frame.constBits(0)) {
d.video_frame = frame;
} else {
if (imgfmt == QImage::Format_Invalid) {
d.video_frame = frame.to(VideoFormat::Format_RGB32);
imgfmt = d.video_frame.imageFormat();
} else {
d.video_frame = frame.to(frame.pixelFormat());
}
}
const bool swapRGB = (int)imgfmt < 0;
if (swapRGB) {
imgfmt = (QImage::Format)(-imgfmt);
}
// DO NOT use frameData().data() because it's temp ptr while d.image does not deep copy the data
QImage image = QImage((uchar*)d.video_frame.constBits(), d.video_frame.width(), d.video_frame.height(), d.video_frame.bytesPerLine(), imgfmt);
if (swapRGB)
image = image.rgbSwapped();
d.pixmap = QPixmap::fromImage(image);
//Format_RGB32 is fast. see document
return true;
}
bool QQuickItemRenderer::receiveFrame(const VideoFrame &frame)
{
DPTR_D(QQuickItemRenderer);
d.video_frame = frame;
if (!isOpenGL()) {
d.image = QImage((uchar*)frame.constBits(), frame.width(), frame.height(), frame.bytesPerLine(), frame.imageFormat());
QRect r = realROI();
if (r != QRect(0, 0, frame.width(), frame.height()))
d.image = d.image.copy(r);
}
d.frame_changed = true;
// update(); // why update slow? because of calling in a different thread?
//QMetaObject::invokeMethod(this, "update"); // slower than directly postEvent
QCoreApplication::postEvent(this, new QEvent(QEvent::User));
return true;
}