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Delegate GUI scaling work to Qt

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Set Qt::AA_EnableHighDpiScaling application attribute when Qt 5.14.x or
newer is used. This fixes a lot of scaling issues on HiDPI displays.

Unfortunately, this flag must be set only before QApllication object
creation, so the only one place where it can be done is main().
This commit is contained in:
Nick Korotysh 2020-03-03 23:39:17 +03:00
parent b519ece18b
commit d49d7c1d82
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GPG key ID: 7D0D4117C97CCC46
2 changed files with 11 additions and 0 deletions
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6
src/app/main.cpp
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@ -133,6 +133,12 @@ int main(int argc, char *argv[])
// We must save it here because QApplication constructor may change it
bool isOneArg = (argc == 2);
#if !defined(DISABLE_GUI) && (QT_VERSION >= QT_VERSION_CHECK(5, 14, 0))
// Attribute Qt::AA_EnableHighDpiScaling must be set before QCoreApplication is created
if (qgetenv("QT_ENABLE_HIGHDPI_SCALING").isEmpty() && qgetenv("QT_AUTO_SCREEN_SCALE_FACTOR").isEmpty())
Application::setAttribute(Qt::AA_EnableHighDpiScaling, true);
#endif
try {
// Create Application
const QString appId = QLatin1String("qBittorrent-") + Utils::Misc::getUserIDString();

5
src/gui/utils.cpp
View file

@ -62,6 +62,10 @@ void Utils::Gui::resize(QWidget *widget, const QSize &newSize)
qreal Utils::Gui::screenScalingFactor(const QWidget *widget)
{
#if (QT_VERSION >= QT_VERSION_CHECK(5, 14, 0))
Q_UNUSED(widget);
return 1;
#else
if (!widget)
return 1;
@ -77,6 +81,7 @@ qreal Utils::Gui::screenScalingFactor(const QWidget *widget)
#else
return widget->devicePixelRatioF();
#endif // Q_OS_WIN
#endif // QT_VERSION
}
QPixmap Utils::Gui::scaledPixmap(const QIcon &icon, const QWidget *widget, const int height)