Details
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Bug
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Resolution: Out of scope
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P2: Important
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None
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5.13.2, 5.15.0
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None
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macOS
Description
It appears that devicePixelRatio is not correctly set for macOS. Same variable is set correctly for Linux and Windows when scaling is enabled but on macOS this variable is always 1 even though scaling is enabled.
auto desktopWidget = QApplication::desktop(); qDebug("DesktopWidget devicePixelRatio: %s", qPrintable(QString::number(desktopWidget->devicePixelRatio()))); qDebug("DesktopWidget devicePixelRatioF: %s", qPrintable(QString::number(desktopWidget->devicePixelRatioF()))); qDebug("DesktopWidget logicalDpiX: %s", qPrintable(QString::number(desktopWidget->logicalDpiX()))); qDebug("DesktopWidget logicalDpiY: %s", qPrintable(QString::number(desktopWidget->logicalDpiY()))); qDebug("DesktopWidget physicalDpiX: %s", qPrintable(QString::number(desktopWidget->physicalDpiX()))); qDebug("DesktopWidget physicalDpiY: %s", qPrintable(QString::number(desktopWidget->physicalDpiY()))); auto screen = QApplication::primaryScreen(); qDebug("QScreen devicePixelRatio: %s", qPrintable(QString::number(screen->devicePixelRatio()))); qDebug("QScreen logicalDotsPerInch: %s", qPrintable(QString::number(screen->logicalDotsPerInch()))); qDebug("QScreen logicalDotsPerInchX: %s", qPrintable(QString::number(screen->logicalDotsPerInchX()))); qDebug("QScreen logicalDotsPerInchY: %s", qPrintable(QString::number(screen->logicalDotsPerInchY()))); qDebug("QScreen physicalDotsPerInch: %s", qPrintable(QString::number(screen->physicalDotsPerInch()))); qDebug("QScreen physicalDotsPerInchX: %s", qPrintable(QString::number(screen->physicalDotsPerInchX()))); qDebug("QScreen physicalDotsPerInchY: %s", qPrintable(QString::number(screen->physicalDotsPerInchY())));
Gives following output:
devicePixelRatio: 1 devicePixelRatioF: 1 logicalDpiX: 72 logicalDpiY: 72 physicalDpiX: 114 physicalDpiy: 114 QScreen devicePixelRatio: 1 QScreen logicalDotsPerInch: 72 QScreen logicalDotsPerInchX: 72 QScreen logicalDotsPerInchY: 72 QScreen physicalDotsPerInch: 113.5 QScreen physicalDotsPerInchX: 113.5 QScreen physicalDotsPerInchY: 113.5
Even though the macOS has a DPI of 227: "13-inch MacBook Pro models introduced in late 2012 or later. Native resolution: 2560 x 1600 at 227 pixels per inch. Support for millions of colors."
