feat: cache wallpapers

Reduces wallpaper load time massively

modules/launcher/WallpaperItem.qml

@@ -25,22 +25,18 @@ StyledRect {
         }
     }
 
-    Image {
+    CachingImage {
         id: image
 
         anchors.horizontalCenter: parent.horizontalCenter
         y: Appearance.padding.normal
 
         visible: false
-        source: `file://${root.modelData.path}`
-        asynchronous: true
-        fillMode: Image.PreserveAspectCrop
+        path: root.modelData.path
         smooth: !root.PathView.view.moving
 
         width: LauncherConfig.sizes.wallpaperWidth
         height: width / 16 * 9
-        sourceSize.width: width
-        sourceSize.height: height
     }
 
     Rectangle {
@@ -70,7 +66,7 @@ StyledRect {
 
         renderType: Text.QtRendering
         text: root.modelData.name
-        font.pointSize: Appearance.font.size.small
+        font.pointSize: Appearance.font.size.normal
     }
 
     Behavior on scale {

services/Thumbnailer.qml

@@ -0,0 +1,45 @@
+pragma Singleton
+
+import Quickshell
+import Quickshell.Io
+import QtQuick
+import Qt.labs.platform
+
+Singleton {
+    id: root
+
+    readonly property string thumbDir: `${StandardPaths.standardLocations(StandardPaths.GenericCacheLocation)[0]}/caelestia/thumbnails`.slice(7)
+
+    function go(sha: string, path: string, width: int, height: int): string {
+        if (!sha || !path || !width || !height)
+            return "";
+
+        const thumbPath = `${thumbDir}/${sha}@${width}x${height}-exact.png`;
+
+        thumbProc.path = path;
+        thumbProc.thumbPath = thumbPath;
+        thumbProc.width = width;
+        thumbProc.height = height;
+        thumbProc.startDetached();
+
+        return thumbPath;
+    }
+
+    Process {
+        id: thumbProc
+
+        property string path
+        property string thumbPath
+        property int width
+        property int height
+
+        command: ["fish", "-c", `
+if ! test -f ${thumbPath}
+    set -l size (identify -ping -format '%w\n%h' ${path})
+    if test $size[1] -gt ${width} -o $size[2] -gt ${height}
+        magick ${path} -thumbnail ${width}x${height}^ -background none -gravity center -extent ${width}x${height} -unsharp 0x.5 ${thumbPath}
+    end
+end
+`]
+    }
+}

services/Wallpapers.qml

@@ -9,7 +9,7 @@ import Qt.labs.platform
 Singleton {
     id: root
 
-    readonly property string path: `${StandardPaths.standardLocations(StandardPaths.PicturesLocation)[0]}/Wallpapers`
+    readonly property string path: `${StandardPaths.standardLocations(StandardPaths.PicturesLocation)[0]}/Wallpapers`.slice(7)
 
     property list<Wallpaper> list
 
@@ -28,7 +28,7 @@ Singleton {
 
     Process {
         running: true
-        command: ["fd", ".", root.path.slice(7), "-t", "f", "-e", "jpg", "-e", "jpeg", "-e", "png", "-e", "svg"]
+        command: ["fd", ".", root.path, "-t", "f", "-e", "jpg", "-e", "jpeg", "-e", "png", "-e", "svg"]
         stdout: SplitParser {
             splitMarker: ""
             onRead: data => {

widgets/CachingImage.qml

@@ -0,0 +1,45 @@
+import "root:/services"
+import Quickshell.Io
+import QtQuick
+
+Image {
+    id: root
+
+    required property string path
+    property string thumbnail: path
+
+    source: `file://${thumbnail}`
+    asynchronous: true
+    fillMode: Image.PreserveAspectCrop
+
+    onPathChanged: shaProc.running = true
+    onWidthChanged: shaProc.running = true
+    onHeightChanged: shaProc.running = true
+    onStatusChanged: {
+        if (status === Image.Error)
+            waitProc.running = true;
+    }
+
+    Process {
+        id: shaProc
+
+        command: ["sha1sum", root.path]
+        stdout: SplitParser {
+            onRead: data => root.thumbnail = Thumbnailer.go(data.split(" ")[0], root.path, root.width, root.height)
+        }
+    }
+
+    Process {
+        id: waitProc
+
+        command: ["inotifywait", "-q", "-e", "close_write", "--format", "%w%f", "-m", root.thumbnail.slice(0, root.thumbnail.lastIndexOf("/"))]
+        stdout: SplitParser {
+            onRead: file => {
+                if (file === root.thumbnail) {
+                    root.source = file;
+                    waitProc.running = false;
+                }
+            }
+        }
+    }
+}