Rationalize QQuaternion's length-scaling code

Use qHypot() to implement length(), avoid duplicating its code and use
its result more carefully, saving the need for casting to and from
double.

Subtracting a double from 1.0f still got a double, so the
qFuzzyIsNull() checks were using double's tolerance, where the use of
1.0f indicates the float tolerance would have been more apt. Also, use
qFuzzyCompare(_, 1.0f) instead of qFuzzyIsNull(_ - 1.0f).

In getEulerAngles(), scale co-ordinates by length before multiplying
(to ensure O(1) quantities) rather than scaling the products by the
squared length (possibly after {ov,und}erflowing).

Change-Id: Id8792d6eb047ee9567a9bbb246657b0217b0849f
Reviewed-by: Andreas Buhr <andreas.buhr@qt.io>
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Andrei Golubev <andrei.golubev@qt.io>

0 files changed, 0 insertions, 0 deletions