[vlc-devel] Qt & fractionnal scaling
jb at videolan.org
Mon Feb 19 19:39:14 CET 2018
On Wed, 14 Feb 2018, at 16:29, Pierre Lamot wrote:
> * Keep the current behavior
> * Patch Qt to provide a rounded scale factor with preference for lower
> value, assuming that users will prefer smaller icons rather than lage ones.
I would do this solution. This seems the less intrusive for now.
> * Patch Qt to provide the real scale factor, this comes with some drawbacks
> the most noticeable beeing that some native widget are poorly rendered (esp
> checkbox and radio buttons)
> * Manually detect system scale factor and force Qt scale. This should be
> done using plateform specific API since we need to modify QT environment and
> QDesktop can't be access before initialising Qt. This provides the same result
> and has the same drawbacks as previous solution.
> * Provide a global scaling option (to change QT_SCALE_FACTOR), modifying
> QT_SCALE_FACTOR works well for icons and pixmap, but it tend to make fonts too
> big or too small, we also need to ensure that (desktop scale factor x qt scale
> factor >= 1) or qt rendering will be broken.
> * Provide an icon scale option and scale every icons and pixmap according to
> this scale (before the DPI scaling). This provides flexibility, but it's a
> tedious task with probably many corner cases.
> * Allow users to disable HiDPI scaling.
> Thank you for your opinion and suggestion on this matter.
>  https://bugreports.qt.io/browse/QTBUG-53022
Jean-Baptiste Kempf - President
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