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if from and to dimensions are different, and we return only to, we should anyways do a new pixmap of the from dimension and center to in it.

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this resolves the flickering PushButton even tough removes some optimizations

svn path=/trunk/KDE/kdelibs/; revision=1064770
This commit is contained in:
Marco Martin 2009-12-21 18:42:45 +00:00
parent fdae3f0d59
commit 3a27e22612
1 changed files with 21 additions and 7 deletions
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28
paintutils.cpp
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@ -150,18 +150,32 @@ QPixmap transition(const QPixmap &from, const QPixmap &to, qreal amount)
int value = int(0xff * amount);
if (value == 0) {
return from;
} else if (value == 0xff) {
return to;
//paint to in the center of from
QRect toRect = to.rect();
toRect.moveCenter(from.rect().center());
if (from.size() == to.size()) {
if (value == 0) {
return from;
} else if (value == 0xff) {
return to;
}
} else {
if (value == 0) {
return from;
} else if (value == 0xff) {
QPixmap result(from.size());
result.fill(Qt::transparent);
QPainter p(&result);
p.setCompositionMode(QPainter::CompositionMode_Source);
p.drawPixmap(toRect.topLeft(), to);
p.end();
}
}
QColor color;
color.setAlphaF(amount);
//paint to in the center of from
QRect toRect = to.rect();
toRect.moveCenter(from.rect().center());
// If the native paint engine supports Porter/Duff compositing and CompositionMode_Plus
if (from.paintEngine()->hasFeature(QPaintEngine::PorterDuff) &&