On Thu, Nov 12, 2015 at 3:49 PM, Adam Light <acli...@gmail.com> wrote:
> We've just started testing our application using Qt 5.6 (self built from > Nov. 10 git checkout). > > It appears that the behavior of QDesktopWidget::logicalDpiX (and Y) has > changed since Qt 5.5. > > We bought a Dell Inspiron 15 laptop with a High DPI display. If I open > Control Panel, choose Display, and click the "set a custom scaling level" > link, the scaling factor was set to 250% out of the box. When we run our > application and call QApplication::desktop()->logicalDpiX(), the value > returned is 80. Using Qt 5.5, that would have returned 240 (2.5 * 96). > > Is this change intentional? This change breaks a lot of the drawing code > in our application, and so I'd like to know whether we need to adapt our > application or if I should report this as a bug. > > Additionally, I notice that if I call > QApplication::desktop()->devicePixelRatioF(), the returned value is 3. I > would expect that 2.5 is returned. > For what it's worth, I've just created https://bugreports.qt.io/browse/QTBUG-49465 for the devicePixelRatioF() issue, since I'm pretty sure that's a bug. Adam >
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