QHighDpi: Replace fromNative()/toNative() with scale()

We need one scale() function for each type: the scale factor can be
inverted by the caller for the fromNative case. Add a generic
templated implementation which will handle simple types. Add add
specialization functions for compound types that don't have
operator*(), as well as for position types (e.g. QPoint) which account
for the origin.

There's no need for fromNativePixels() and toNativePixels() overloads
for each type; replace with generic implementations which call
scale(). Do the same thing for fromNativeLocalPosition().

Some user code is calling fromNative()/toNative() directly, so leave a
definition of those functions around for now. Also leave a couple of
one-off scaling functions which do not fit the pattern.

Also fix “narrowing conversion scaleFactor to int” warning for the
QMargins scale function.

Change-Id: Ia67accbb670a80dc1747c2e264b97aab75b1251b
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
 
 

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