Revert "QCommonStyle: paint arrows with anti-aliasing"

This reverts commit 74e8f673b827c57ebf2bf802840c19e4a1ac848b.

Reason for revert: the change as is makes the rendering of arrows in the
styles unpleasantly blurry.

Pick-to: 6.7
Change-Id: I59ccd7373631a550276465caffb7d3074ff5893c
Reviewed-by: Axel Spoerl <axel.spoerl@qt.io>

1 files changed, 5 insertions, 4 deletions

diff --git a/src/widgets/styles/qcommonstyle.cpp b/src/widgets/styles/qcommonstyle.cpp
index 418a0c2c5f..6ff85e2c1b 100644
--- a/src/widgets/styles/qcommonstyle.cpp
+++ b/src/widgets/styles/qcommonstyle.cpp
@@ -761,11 +761,11 @@ void QCommonStyle::drawPrimitive(PrimitiveElement pe, const QStyleOption *opt, Q
                                                      % HexString<uint>(pe),
                                              opt, QSize(size, size), dpr);
             if (!QPixmapCache::find(pixmapName, &pixmap)) {
-                const qreal border = size / 5.;
-                const qreal sqsize = size;
-                pixmap = styleCachePixmap(QSize(size, size), dpr);
+                const qreal border = dpr * (size / 5.);
+                const qreal sqsize = dpr * size;
+                pixmap = QPixmap(QSize(size, size));
+                pixmap.fill(Qt::transparent);
                 QPainter imagePainter(&pixmap);
-                imagePainter.setRenderHint(QPainter::Antialiasing);
 
                 QPolygonF poly;
                 switch (pe) {
@@ -812,6 +812,7 @@ void QCommonStyle::drawPrimitive(PrimitiveElement pe, const QStyleOption *opt, Q
 
                 imagePainter.drawPolygon(poly);
                 imagePainter.end();
+                pixmap.setDevicePixelRatio(dpr);
                 QPixmapCache::insert(pixmapName, pixmap);
             }
             int xOffset = r.x() + (r.width() - size)/2;