Create thumbnails with scene devicePixelRatio

4 files changed, 28 insertions, 5 deletions

diff --git a/src/kitemviews/kfileitemmodelrolesupdater.cpp b/src/kitemviews/kfileitemmodelrolesupdater.cpp
index e6e8ea25d..06500b45d 100644
--- a/src/kitemviews/kfileitemmodelrolesupdater.cpp
+++ b/src/kitemviews/kfileitemmodelrolesupdater.cpp
@@ -67,6 +67,7 @@ KFileItemModelRolesUpdater::KFileItemModelRolesUpdater(KFileItemModel *model, QO
     , m_finishedItems()
     , m_model(model)
     , m_iconSize()
+    , m_devicePixelRatio(1.0)
     , m_firstVisibleIndex(0)
     , m_lastVisibleIndex(-1)
     , m_maximumVisibleItems(50)
@@ -158,6 +159,25 @@ QSize KFileItemModelRolesUpdater::iconSize() const
     return m_iconSize;
 }
 
+void KFileItemModelRolesUpdater::setDevicePixelRatio(qreal devicePixelRatio)
+{
+    if (m_devicePixelRatio != devicePixelRatio) {
+        m_devicePixelRatio = devicePixelRatio;
+        if (m_state == Paused) {
+            m_iconSizeChangedDuringPausing = true;
+        } else if (m_previewShown) {
+            // A dpr change requires the regenerating of all previews.
+            m_finishedItems.clear();
+            startUpdating();
+        }
+    }
+}
+
+qreal KFileItemModelRolesUpdater::devicePixelRatio() const
+{
+    return m_devicePixelRatio;
+}
+
 void KFileItemModelRolesUpdater::setVisibleIndexRange(int index, int count)
 {
     if (index < 0) {
@@ -992,7 +1012,7 @@ void KFileItemModelRolesUpdater::startPreviewJob()
     }
 
     KIO::PreviewJob *job = new KIO::PreviewJob(itemSubSet, cacheSize, &m_enabledPlugins);
-
+    job->setDevicePixelRatio(m_devicePixelRatio);
     job->setIgnoreMaximumSize(itemSubSet.first().isLocalFile() && !itemSubSet.first().isSlow() && m_localFileSizePreviewLimit <= 0);
     if (job->uiDelegate()) {
         KJobWidgets::setWindow(job, qApp->activeWindow());
@@ -1038,8 +1058,8 @@ QPixmap KFileItemModelRolesUpdater::transformPreviewPixmap(const QPixmap &pixmap
             }
         }
     } else if (!pixmap.isNull()) {
-        KPixmapModifier::scale(scaledPixmap, m_iconSize * qApp->devicePixelRatio());
-        scaledPixmap.setDevicePixelRatio(qApp->devicePixelRatio());
+        KPixmapModifier::scale(scaledPixmap, m_iconSize * m_devicePixelRatio);
+        scaledPixmap.setDevicePixelRatio(m_devicePixelRatio);
     }
 
     return scaledPixmap;
diff --git a/src/kitemviews/kfileitemmodelrolesupdater.h b/src/kitemviews/kfileitemmodelrolesupdater.h
index 78fa757f8..aa9ca5fc0 100644
--- a/src/kitemviews/kfileitemmodelrolesupdater.h
+++ b/src/kitemviews/kfileitemmodelrolesupdater.h
@@ -89,6 +89,9 @@ public:
     void setIconSize(const QSize &size);
     QSize iconSize() const;
 
+    void setDevicePixelRatio(qreal devicePixelRatio);
+    qreal devicePixelRatio() const;
+
     /**
      * Sets the range of items that are visible currently. The roles
      * of visible items are resolved first.
@@ -366,6 +369,7 @@ private:
 
     KFileItemModel *m_model;
     QSize m_iconSize;
+    qreal m_devicePixelRatio;
     int m_firstVisibleIndex;
     int m_lastVisibleIndex;
     int m_maximumVisibleItems;
diff --git a/src/main.cpp b/src/main.cpp
index 2d1ccd0c8..ac817eca9 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -79,8 +79,6 @@ int main(int argc, char **argv)
     QApplication app(argc, argv);
     app.setWindowIcon(QIcon::fromTheme(QStringLiteral("system-file-manager"), app.windowIcon()));
 
-    KIO::PreviewJob::setDefaultDevicePixelRatio(app.devicePixelRatio());
-
     KCrash::initialize();
 
 #if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
diff --git a/src/panels/information/informationpanelcontent.cpp b/src/panels/information/informationpanelcontent.cpp
index 62f25b24b..23870b0b1 100644
--- a/src/panels/information/informationpanelcontent.cpp
+++ b/src/panels/information/informationpanelcontent.cpp
@@ -178,6 +178,7 @@ void InformationPanelContent::refreshPixmapView()
     m_previewJob = new KIO::PreviewJob(KFileItemList() << m_item, QSize(m_preview->width(), m_preview->height()), &plugins);
     m_previewJob->setScaleType(KIO::PreviewJob::Unscaled);
     m_previewJob->setIgnoreMaximumSize(m_item.isLocalFile() && !m_item.isSlow());
+    m_previewJob->setDevicePixelRatio(devicePixelRatioF());
     if (m_previewJob->uiDelegate()) {
         KJobWidgets::setWindow(m_previewJob, this);
     }