xcb: round down the scale factor for values < 0.8
This solves huge UI on some (most ?) HD 13 inches that have a calculated scale factor around 1.75. Task-number: QTBUG-53022 QTBUG-57211 Change-Id: I6cc22d3e47d38cb1d5a0daf5646a936256664e48 Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io> Reviewed-by: Frederik Gladhorn <frederik.gladhorn@qt.io>
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@ -750,7 +750,12 @@ void QXcbScreen::updateGeometry(const QRect &geometry, uint8_t rotation)
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m_sizeMillimeters = sizeInMillimeters(geometry.size(), virtualDpi());
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qreal dpi = geometry.width() / physicalSize().width() * qreal(25.4);
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m_pixelDensity = qMax(1, qRound(dpi/96));
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qreal rawFactor = dpi/96;
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int roundedFactor = qFloor(rawFactor);
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// Round up for .8 and higher. This favors "small UI" over "large UI".
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if (rawFactor - roundedFactor >= 0.8)
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roundedFactor = qCeil(rawFactor);
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m_pixelDensity = qMax(1, roundedFactor);
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m_geometry = geometry;
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m_availableGeometry = geometry & m_virtualDesktop->workArea();
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QWindowSystemInterface::handleScreenGeometryChange(QPlatformScreen::screen(), m_geometry, m_availableGeometry);
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