It appears QScreen.physicalDotsPerInch for Mir is implemented in QtMir:
void Screen::setMirDisplayConfiguration(const
mir::graphics::DisplayConfigurationOutput &screen)
{
...
// Physical screen size
m_physicalSize.setWidth(screen.physical_size_mm.width.as_float());
m_physicalSize.setHeight(screen.physical_size_mm.height.as_float());
Per previous comments above however I have not been able to find any
case in which these values from Mir were wrong. It appears that possibly
QtMir is getting its data from an inactive or invalid
mir::graphics::DisplayConfigurationOutput. So QtMir should be careful to
enumerate all the outputs available and pick one that is valid, because
some outputs do exist but are unplugged or turned off. And so will have
invalid data in some fields like physical_size_mm.
** Package changed: qtubuntu (Ubuntu) => qtmir (Ubuntu)
** Package changed: unity8 (Ubuntu) => qtmir
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https://bugs.launchpad.net/bugs/1525293
Title:
"window->screen()->physicalDotsPerInch() / 25.4" may be negative on
xenial
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