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QCommonStyle: don't use a QImage when drawing arrows

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Using a QImage as a paintDevice is not needed - directly paint on a
QPixmap. Also use styleCachePixmap() which avoids the need for
multiplying the size with the dpr.

Change-Id: I114f78c20d2b92b4fd135c8f64b452fb81a02baf
Reviewed-by: Axel Spoerl <axel.spoerl@qt.io>
Reviewed-by: Wladimir Leuschner <wladimir.leuschner@qt.io>
This commit is contained in:
Christian Ehrlicher 2024-04-19 22:05:15 +02:00
parent 896c4fe427
commit f5fa811e88
1 changed files with 8 additions and 11 deletions
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19
src/widgets/styles/qcommonstyle.cpp
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@ -750,22 +750,21 @@ void QCommonStyle::drawPrimitive(PrimitiveElement pe, const QStyleOption *opt, Q
case PE_IndicatorArrowRight:
case PE_IndicatorArrowLeft:
{
if (opt->rect.width() <= 1 || opt->rect.height() <= 1)
const QRect &r = opt->rect;
if (r.width() <= 1 || r.height() <= 1)
break;
QRect r = opt->rect;
int size = qMin(r.height(), r.width());
QPixmap pixmap;
const qreal pixelRatio = p->device()->devicePixelRatio();
const qreal dpr = p->device()->devicePixelRatio();
const QString pixmapName = QStyleHelper::uniqueName("$qt_ia-"_L1
% QLatin1StringView(metaObject()->className())
% HexString<uint>(pe),
opt, QSize(size, size), pixelRatio);
opt, QSize(size, size), dpr);
if (!QPixmapCache::find(pixmapName, &pixmap)) {
const qreal border = pixelRatio * (size / 5.);
const qreal sqsize = pixelRatio * size;
QImage image(sqsize, sqsize, QImage::Format_ARGB32_Premultiplied);
image.fill(Qt::transparent);
QPainter imagePainter(&image);
const qreal border = size / 5.;
const qreal sqsize = size;
pixmap = styleCachePixmap(QSize(size, size), dpr);
QPainter imagePainter(&pixmap);
imagePainter.setRenderHint(QPainter::Antialiasing);
QPolygonF poly;
@ -813,8 +812,6 @@ void QCommonStyle::drawPrimitive(PrimitiveElement pe, const QStyleOption *opt, Q
imagePainter.drawPolygon(poly);
imagePainter.end();
pixmap = QPixmap::fromImage(image);
pixmap.setDevicePixelRatio(pixelRatio);
QPixmapCache::insert(pixmapName, pixmap);
}
int xOffset = r.x() + (r.width() - size)/2;