Added QScreen::refreshRate() to get the vertical refresh rate.

To give applications that want it the option to use a fixed timestep for
animations, and to avoid having values of 60 hard-coded (we have a
couple of those in qtdeclarative/src/quick already), we need to know the
refresh rates of the screens we are rendering to.

Change-Id: Ife49162e830440ad7eab563a27e8aebbbafc5fc5
Reviewed-by: Girish Ramakrishnan <girish.1.ramakrishnan@nokia.com>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@nokia.com>
Reviewed-by: Lars Knoll <lars.knoll@nokia.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/src/gui/kernel/qplatformscreen_qpa.cpp b/src/gui/kernel/qplatformscreen_qpa.cpp
index 6c2f98beb4..1fd96a80a5 100644
--- a/src/gui/kernel/qplatformscreen_qpa.cpp
+++ b/src/gui/kernel/qplatformscreen_qpa.cpp
@@ -161,6 +161,17 @@ QDpi QPlatformScreen::logicalDpi() const
 }
 
 /*!
+    Reimplement this function in subclass to return the vertical refresh rate
+    of the screen, in Hz.
+
+    The default returns 60, a sensible default for modern displays.
+*/
+qreal QPlatformScreen::refreshRate() const
+{
+    return 60;
+}
+
+/*!
     Reimplement this function in subclass to return the current orientation
     of the screen, for example based on accelerometer data to determine
     the device orientation.