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xcb: Fix FP1616 to double conversion

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We should divide the fractional part of the FP1616 value by 0x10000
instead of 0xFFFF, otherwise 1.FFFF will be converted to 2.0.
And right-shifting the integer part by 16 is equal to dividing it
by 0x10000. So just divide the whole FP1616 value by 0x10000.

Change-Id: Ia89a274b81be9cf502e1f311f696a610a7f37d7f
Task-number: QTBUG-45378
Reviewed-by: Laszlo Agocs <laszlo.agocs@theqtcompany.com>
This commit is contained in:
Alexander Volkov 2015-05-14 12:49:31 +03:00
parent 7d1ec1ae9e
commit 7d3f353a5b
1 changed files with 1 additions and 1 deletions
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2
src/plugins/platforms/xcb/qxcbconnection_xi2.cpp
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@ -450,7 +450,7 @@ XInput2TouchDeviceData *QXcbConnection::touchDeviceForId(int id)
#if defined(XCB_USE_XINPUT21) || !defined(QT_NO_TABLETEVENT)
static qreal fixed1616ToReal(FP1616 val)
{
return (qreal(val >> 16)) + (val & 0xFFFF) / (qreal)0xFFFF;
return qreal(val) / 0x10000;
}
#endif // defined(XCB_USE_XINPUT21) || !defined(QT_NO_TABLETEVENT)