How to display transparent QT Window on linuxfb plugin ?

Hello,

I am not aware with QT but you could try:


setStyleSheet("background:transparent;");
setAttribute(Qt::WA_TranslucentBackground);
setWindowFlags(Qt::FramelessWindowHint);

or you could try to search in the qt forum or in QT documentation:
doc.qt.io/.../application-windows.html

BR
Margarita

Hi Margarita,

I did this, but no success, linuxfb shows black screen still..

-- Sanchit Mehra

Hello,

You could try to search in the QT forum how this could be set. Or try to check in the demos in EZSDK.

BR
Margarita

One have to enable the Transparency Keying in the driver to make the transparent pixel appear transparent.

struct ti81xxfb_region_params regp;
int fd;

fd = open ("/dev/fb0", O_RDWR);
if (fd == -1) {
perror("failed to open display device\n");
return -1;
}

if (ioctl(fd, TIFB_GET_PARAMS, &regp) < 0) {
perror("TIFB_GET_PARAMS\n");
close(fd);
exit(1);
}

/* Enable the Transparency Keying */
regp.transen = TI81XXFB_FEATURE_ENABLE;
if (ioctl(fd, TIFB_SET_PARAMS, &regp) < 0) {
perror ("TIFB_SET_PARAMS.\n");
close(fd);
exit(1);

Hello,

You could check these topics:

e2e.ti.com/.../215818
e2e.ti.com/.../218831

BR
Margarita