QSizeF q_physicalScreenSizeFromFb(int framebufferDevice, const QSize &screenSize)
{
#ifndef Q_OS_LINUX
Q_UNUSED(framebufferDevice)
#endif
const int defaultPhysicalDpi = 100;
static QSizeF size;
if (size.isEmpty()) {
// Note: in millimeters
int width = qEnvironmentVariableIntValue("QT_QPA_EGLFS_PHYSICAL_WIDTH");
int height = qEnvironmentVariableIntValue("QT_QPA_EGLFS_PHYSICAL_HEIGHT");
if (width && height) {
size.setWidth(width);
size.setHeight(height);
return size;
}
int w = -1;
int h = -1;
QSize screenResolution;
#ifdef Q_OS_LINUX
struct fb_var_screeninfo vinfo;
if (framebufferDevice != -1) {
if (ioctl(framebufferDevice, FBIOGET_VSCREENINFO, &vinfo) == -1) {
qWarning("eglconvenience: Could not query screen info");
} else {
w = vinfo.width;
h = vinfo.height;
screenResolution = QSize(vinfo.xres, vinfo.yres);
}
} else
#endif
{
// Use the provided screen size, when available, since some platforms may have their own
// specific way to query it. Otherwise try querying it from the framebuffer.
screenResolution = screenSize.isEmpty() ? q_screenSizeFromFb(framebufferDevice) : screenSize;
}
size.setWidth(w <= 0 ? screenResolution.width() * Q_MM_PER_INCH / defaultPhysicalDpi : qreal(w));
size.setHeight(h <= 0 ? screenResolution.height() * Q_MM_PER_INCH / defaultPhysicalDpi : qreal(h));
if (w <= 0 || h <= 0)
qWarning("Unable to query physical screen size, defaulting to %d dpi.\n"
"To override, set QT_QPA_EGLFS_PHYSICAL_WIDTH "
"and QT_QPA_EGLFS_PHYSICAL_HEIGHT (in millimeters).", defaultPhysicalDpi);
}
return size;
}
QSize QEGLDeviceIntegration::screenSize() const
{
return q_screenSizeFromFb(framebuffer);
}
QSize QEglFSHooks::screenSize() const
{
return q_screenSizeFromFb(framebuffer);
}
