views: Use scene devicePixelRatio rather than qApp

When possible, use the devicePixelRatio from the scene which on Wayland
unlike the QApplication will properly support fractional scaling.

A KItemViewsUtils class is introduced that can be reused elsewhere.

2 files changed, 5 insertions, 3 deletions

diff --git a/src/views/dolphinfileitemlistwidget.cpp b/src/views/dolphinfileitemlistwidget.cpp
index 921baf73f..11c88d402 100644
--- a/src/views/dolphinfileitemlistwidget.cpp
+++ b/src/views/dolphinfileitemlistwidget.cpp
@@ -5,6 +5,7 @@
  */
 
 #include "dolphinfileitemlistwidget.h"
+#include "../kitemviews/private/kitemviewsutils.h"
 
 #include "dolphindebug.h"
 
@@ -77,7 +78,7 @@ void DolphinFileItemListWidget::refreshCache()
     setTextColor(color);
 }
 
-QPixmap DolphinFileItemListWidget::overlayForState(KVersionControlPlugin::ItemVersion version, int size)
+QPixmap DolphinFileItemListWidget::overlayForState(KVersionControlPlugin::ItemVersion version, int size) const
 {
     int overlayHeight = KIconLoader::SizeSmall;
     if (size >= KIconLoader::SizeEnormous) {
@@ -122,7 +123,8 @@ QPixmap DolphinFileItemListWidget::overlayForState(KVersionControlPlugin::ItemVe
         break;
     }
 
-    return QIcon::fromTheme(iconName).pixmap(QSize(overlayHeight, overlayHeight));
+    const qreal dpr = KItemViewsUtils::devicePixelRatio(this);
+    return QIcon::fromTheme(iconName).pixmap(QSize(overlayHeight, overlayHeight), dpr);
 }
 
 #include "moc_dolphinfileitemlistwidget.cpp"
diff --git a/src/views/dolphinfileitemlistwidget.h b/src/views/dolphinfileitemlistwidget.h
index ac98666c8..92fc66fcc 100644
--- a/src/views/dolphinfileitemlistwidget.h
+++ b/src/views/dolphinfileitemlistwidget.h
@@ -29,7 +29,7 @@ protected:
     void refreshCache() override;
 
 private:
-    static QPixmap overlayForState(KVersionControlPlugin::ItemVersion version, int size);
+    QPixmap overlayForState(KVersionControlPlugin::ItemVersion version, int size) const;
 };
 
 #endif