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QML UI: more hacks for the magicShiftFactor hack

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Since the device pixel ratio can be a fraction we should interpolate the
values. I still don't really understand why this is necessary, so this is
a hack on top of a hack - but for most values I tried this does seem to
give us a reasonably well placed (and well scaled) profile.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
This commit is contained in:
Dirk Hohndel 2017-04-03 12:49:14 -07:00
parent e4086dc746
commit e700ea9638
1 changed files with 13 additions and 3 deletions
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16
mobile-widgets/qmlprofile.cpp
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@ -37,9 +37,19 @@ void QMLProfile::paint(QPainter *painter)
qreal sy = painterRect.height() / sceneSize / dprComp;
// next figure out the weird magic by which we need to shift the painter so the profile is shown
int dpr = lrint(devicePixelRatio());
qreal magicShiftFactor = (dpr == 2 ? 0.25 : (dpr == 3 ? 0.33 : 0.0));
double dpr = devicePixelRatio();
double magicValues[] = { 0.0, 0.1, 0.25, 0.33, 0.375, 0.40, 0.42};
qreal magicShiftFactor = 0.0;
if (dpr <= 1.5) {
magicShiftFactor = magicValues[0];
} else if (dpr > 6.0) {
magicShiftFactor = magicValues[6];
} else if (IS_FP_SAME(dpr, rint(dpr))) {
magicShiftFactor = magicValues[lrint(dpr)];
} else {
int lower = (int)dpr;
magicShiftFactor = (magicValues[lower] * (lower + 1 - dpr) + magicValues[lower + 1] * (dpr - lower));
}
// now set up the transformations scale the profile and
// shift the painter (taking its existing transformation into account)
QTransform profileTransform = QTransform();