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QScreen: Add a note to use QWindow::devicePixelRatio if possible

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Like QGuiApplication does as well. Also add a note that screen and
window DPR can be different.

Pick-to: 6.9 6.8
Change-Id: I1a24cf7f11e945187da9dce4421039350e811997
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
This commit is contained in:
David Redondo 2025-02-04 13:26:59 +01:00 committed by Tor Arne Vestbø
parent c10072895d
commit 9704927844
1 changed files with 4 additions and 0 deletions
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src/gui/kernel/qscreen.cpp
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@ -281,6 +281,10 @@ qreal QScreen::logicalDotsPerInch() const
Common values are 1.0 on normal displays and 2.0 on "retina" displays.
Higher values are also possible.
\note On some platforms the devicePixelRatio of a window and the screen it is on can
be different. Use this function only when you don't know which window you are targeting.
If you do know the target window, use QWindow::devicePixelRatio() instead.
\sa QWindow::devicePixelRatio(), QGuiApplication::devicePixelRatio()
*/
qreal QScreen::devicePixelRatio() const