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QCommonStyle: Adjust painting arrows in high-dpi mode

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PE_IndicatorArrowUp/Down/Left/Right was drawn using integer coordinates
for the three edges which lead to artifacts in high-dpi mode. Fix it by
using QPointF instead.

Fixes: QTBUG-114539
Change-Id: I03cbff2ef789e8cee0f3a0d84138d94516340669
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
(cherry picked from commit 3936d254ca0e7259cd97238c31df8413d03fd475)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
This commit is contained in:
Christian Ehrlicher 2023-11-11 21:14:54 +01:00 committed by Qt Cherry-pick Bot
parent 55e6822bc8
commit 62f32c7e18
1 changed files with 14 additions and 14 deletions
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28
src/widgets/styles/qcommonstyle.cpp
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@ -741,26 +741,26 @@ void QCommonStyle::drawPrimitive(PrimitiveElement pe, const QStyleOption *opt, Q
% HexString<uint>(pe),
opt, QSize(size, size));
if (!QPixmapCache::find(pixmapName, &pixmap)) {
qreal pixelRatio = p->device()->devicePixelRatio();
int border = qRound(pixelRatio*(size/5));
int sqsize = qRound(pixelRatio*(2*(size/2)));
const qreal pixelRatio = p->device()->devicePixelRatio();
const qreal border = pixelRatio * (size / 5.);
const qreal sqsize = pixelRatio * size;
QImage image(sqsize, sqsize, QImage::Format_ARGB32_Premultiplied);
image.fill(0);
image.fill(Qt::transparent);
QPainter imagePainter(&image);
QPolygon a;
QPolygonF poly;
switch (pe) {
case PE_IndicatorArrowUp:
a.setPoints(3, border, sqsize/2, sqsize/2, border, sqsize - border, sqsize/2);
poly = {QPointF(border, sqsize / 2), QPointF(sqsize / 2, border), QPointF(sqsize - border, sqsize / 2)};
break;
case PE_IndicatorArrowDown:
a.setPoints(3, border, sqsize/2, sqsize/2, sqsize - border, sqsize - border, sqsize/2);
poly = {QPointF(border, sqsize / 2), QPointF(sqsize / 2, sqsize - border), QPointF(sqsize - border, sqsize / 2)};
break;
case PE_IndicatorArrowRight:
a.setPoints(3, sqsize - border, sqsize/2, sqsize/2, border, sqsize/2, sqsize - border);
poly = {QPointF(sqsize - border, sqsize / 2), QPointF(sqsize / 2, border), QPointF(sqsize / 2, sqsize - border)};
break;
case PE_IndicatorArrowLeft:
a.setPoints(3, border, sqsize/2, sqsize/2, border, sqsize/2, sqsize - border);
poly = {QPointF(border, sqsize / 2), QPointF(sqsize / 2, border), QPointF(sqsize / 2, sqsize - border)};
break;
default:
break;
@ -774,9 +774,9 @@ void QCommonStyle::drawPrimitive(PrimitiveElement pe, const QStyleOption *opt, Q
bsy = proxy()->pixelMetric(PM_ButtonShiftVertical, opt, widget);
}
QRect bounds = a.boundingRect();
int sx = sqsize / 2 - bounds.center().x() - 1;
int sy = sqsize / 2 - bounds.center().y() - 1;
const QRectF bounds = poly.boundingRect();
const qreal sx = sqsize / 2 - bounds.center().x() - 1;
const qreal sy = sqsize / 2 - bounds.center().y() - 1;
imagePainter.translate(sx + bsx, sy + bsy);
imagePainter.setPen(opt->palette.buttonText().color());
imagePainter.setBrush(opt->palette.buttonText());
@ -785,13 +785,13 @@ void QCommonStyle::drawPrimitive(PrimitiveElement pe, const QStyleOption *opt, Q
imagePainter.translate(1, 1);
imagePainter.setBrush(opt->palette.light().color());
imagePainter.setPen(opt->palette.light().color());
imagePainter.drawPolygon(a);
imagePainter.drawPolygon(poly);
imagePainter.translate(-1, -1);
imagePainter.setBrush(opt->palette.mid().color());
imagePainter.setPen(opt->palette.mid().color());
}
imagePainter.drawPolygon(a);
imagePainter.drawPolygon(poly);
imagePainter.end();
pixmap = QPixmap::fromImage(image);
pixmap.setDevicePixelRatio(pixelRatio);