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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.

Change-Id: I1a24cf7f11e945187da9dce4421039350e811997
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
(cherry picked from commit 97049278443860d3dd1b1efd20d1f7dabaf72a35)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
(cherry picked from commit 281c45452b93b38d50b4c43a743017c5a1aa7cd1)
Reviewed-by: David Redondo <qt@david-redondo.de>
This commit is contained in:
David Redondo 2025-02-04 13:26:59 +01:00 committed by Qt Cherry-pick Bot
parent 3186048ffe
commit 752f16522d
1 changed files with 4 additions and 0 deletions
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src/gui/kernel/qscreen.cpp
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@ -280,6 +280,10 @@ 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