> On 25 Mar 2015, at 17:21, John Weeks <j...@wavemetrics.com> wrote: > > It looks to me like at present (Qt 5.4) the various devicePixelRatio() > functions on Windows only return 1.0 or 2.0. But Windows systems can be at > fractional ratios- will 5.5 address that? > > It also appears that drawing a QPixmap or QImage with a fractional ratio > actually works, but we can't discover that situation easily.
I don’t think we can officially support fractional ratios, in the sense that we can’t guarantee glitch-free graphics. Qt currently has one central int-based API (QPaintDevice:: devicePixelRatio()) which limits fractional ratio support. That said, my personal opinion is that we should add QPaintDevice::devicePixelRatioF() and take a "best effort” approach at making it work. No guarantees that it actually will in all cases, though. Morten _______________________________________________ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
