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Fix clipping of wave underline decoration on certain fonts

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Limit the height of the the wave-pixmap so that fillRect doesn't clip
it.

At the same time the precision of the generated wave-pixmap is improved
so it better fits the requested radius.

Task-number: QTCREATORBUG-15851
Change-Id: If754387b20ab7b015857ecb0a0e8fe16de1d728a
Reviewed-by: Konstantin Ritt <ritt.ks@gmail.com>
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@qt.io>
This commit is contained in:
Allan Sandfeld Jensen 2016-04-25 15:19:53 +02:00 committed by Konstantin Ritt
parent 4c6324b5a7
commit ab06266e15
1 changed files with 7 additions and 5 deletions
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12
src/gui/painting/qpainter.cpp
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@ -6179,7 +6179,8 @@ static QPixmap generateWavyPixmap(qreal maxRadius, const QPen &pen)
QString key = QLatin1String("WaveUnderline-")
% pen.color().name()
% HexString<qreal>(radiusBase);
% HexString<qreal>(radiusBase)
% HexString<qreal>(pen.widthF());
QPixmap pixmap;
if (QPixmapCache::find(key, pixmap))
@ -6187,7 +6188,7 @@ static QPixmap generateWavyPixmap(qreal maxRadius, const QPen &pen)
const qreal halfPeriod = qMax(qreal(2), qreal(radiusBase * 1.61803399)); // the golden ratio
const int width = qCeil(100 / (2 * halfPeriod)) * (2 * halfPeriod);
const int radius = qFloor(radiusBase);
const qreal radius = qFloor(radiusBase * 2) / 2.;
QPainterPath path;
@ -6210,7 +6211,7 @@ static QPixmap generateWavyPixmap(qreal maxRadius, const QPen &pen)
// due to it having a rather thick width for the regular underline.
const qreal maxPenWidth = .8 * radius;
if (wavePen.widthF() > maxPenWidth)
wavePen.setWidth(maxPenWidth);
wavePen.setWidthF(maxPenWidth);
QPainter imgPainter(&pixmap);
imgPainter.setPen(wavePen);
@ -6263,14 +6264,15 @@ static void drawTextItemDecoration(QPainter *painter, const QPointF &pos, const
if (underlineStyle == QTextCharFormat::WaveUnderline) {
painter->save();
painter->translate(0, pos.y() + 1);
qreal maxHeight = fe->descent().toReal() - qreal(1);
QColor uc = charFormat.underlineColor();
if (uc.isValid())
pen.setColor(uc);
// Adapt wave to underlineOffset or pen width, whatever is larger, to make it work on all platforms
const QPixmap wave = generateWavyPixmap(qMax(underlineOffset, pen.widthF()), pen);
const int descent = (int) fe->descent().toReal();
const QPixmap wave = generateWavyPixmap(qMin(qMax(underlineOffset, pen.widthF()), maxHeight / 2.), pen);
const int descent = qFloor(maxHeight);
painter->setBrushOrigin(painter->brushOrigin().x(), 0);
painter->fillRect(pos.x(), 0, qCeil(width), qMin(wave.height(), descent), wave);