fix: handle hidpi properly

components/images/CachingImage.qml

@@ -1,4 +1,5 @@
 import QtQuick
+import Quickshell
 import Caelestia.Images
 
 Image {
@@ -9,5 +10,8 @@ Image {
     asynchronous: true
     fillMode: Image.PreserveAspectCrop
     source: IUtils.urlForPath(path, fillMode)
-    sourceSize: Qt.size(width, height)
+    sourceSize: {
+        const dpr = (QsWindow.window as QsWindow)?.devicePixelRatio ?? 1;
+        return Qt.size(width * dpr, height * dpr);
+    }
 }

modules/launcher/items/WallpaperItem.qml

@@ -1,4 +1,5 @@
 import QtQuick
+import Quickshell
 import Caelestia.Config
 import Caelestia.Models
 import qs.components
@@ -66,7 +67,10 @@ Item {
             anchors.fill: parent
             path: root.modelData.path
             smooth: !root.PathView.view.moving
-            sourceSize: Qt.size(image.implicitWidth, image.implicitHeight)
+            sourceSize: {
+                const dpr = (QsWindow.window as QsWindow)?.devicePixelRatio ?? 1;
+                return Qt.size(image.implicitWidth * dpr, image.implicitHeight * dpr);
+            }
         }
     }
 

plugin/src/Caelestia/Images/iutils.cpp

@@ -16,6 +16,9 @@ IUtils* IUtils::create(QQmlEngine* engine, QJSEngine* jsEngine) {
 }
 
 QUrl IUtils::urlForPath(const QString& path, int fillMode) {
+    if (path.isEmpty())
+        return QUrl();
+
     QString prefix;
     switch (fillMode) {
     case 1: // Image.PreserveAspectFit