diff options
Diffstat (limited to 'src/gui/kernel/qplatformscreen_qpa.cpp')
| -rw-r--r-- | src/gui/kernel/qplatformscreen_qpa.cpp | 33 |
1 files changed, 27 insertions, 6 deletions
diff --git a/src/gui/kernel/qplatformscreen_qpa.cpp b/src/gui/kernel/qplatformscreen_qpa.cpp index 1a8e6d8f7c..86dc0bd588 100644 --- a/src/gui/kernel/qplatformscreen_qpa.cpp +++ b/src/gui/kernel/qplatformscreen_qpa.cpp @@ -127,20 +127,41 @@ QScreen *QPlatformScreen::screen() const /*! Reimplement this function in subclass to return the physical size of the - screen. This function is used by QFont to convert point sizes to pixel - sizes. + screen. The physical size represents the actual physical dimensions of + the display. The default implementation takes the pixel size of the screen, considers a resolution of 100 dots per inch, and returns the calculated physical size. A device with a screen that has different resolutions will need to be supported by a suitable reimplementation of this function. + + \sa logcalDpi */ -QSize QPlatformScreen::physicalSize() const +QSizeF QPlatformScreen::physicalSize() const { static const int dpi = 100; - int width = geometry().width() / dpi * qreal(25.4) ; - int height = geometry().height() / dpi * qreal(25.4) ; - return QSize(width,height); + return QSizeF(geometry().size()) / dpi * qreal(25.4); +} + +/*! + Reimplement this function in subclass to return the logical horizontal + and vertical dots per inch metrics of the screen. + + The logical dots per inch metrics are used by QFont to convert point sizes + to pixel sizes. + + The default implementation uses the screen pixel size and physical size to + compute the metrics. + + \sa physicalSize +*/ +QDpi QPlatformScreen::logicalDpi() const +{ + QSizeF ps = physicalSize(); + QSize s = geometry().size(); + + return QDpi(25.4 * s.width() / ps.width(), + 25.4 * s.height() / ps.height()); } QPlatformScreen * QPlatformScreen::platformScreenForWindow(const QWindow *window) |