feat: add wallpaper transitions, store crop in database per-wallpaper, move CUDA context creation to async thread

Plugins/ZShell/Models/wallpaperdb.hpp

@@ -11,6 +11,7 @@
 #include <qqmllist.h>
 #include <qsize.h>
 #include <qtimer.h>
+#include <qvariant.h>
 #include <qvector.h>
 
 namespace ZShell::models {
@@ -109,6 +110,11 @@ class WallpaperDb : public QObject {
 
 	[[nodiscard]] static QString thumbnailUrl(const QString& path);
 
+	Q_INVOKABLE QVariantMap crop(const QString& path, const QString& screen)
+		const;
+	Q_INVOKABLE void setCrop(
+		const QString& path, const QString& screen, const QVariantMap& crop);
+
 	signals:
 	void pathChanged();
 	void dbPathChanged();
@@ -117,6 +123,7 @@ class WallpaperDb : public QObject {
 	void cacheSizeChanged();
 
 	void cacheStored(const QString& path);
+	void cropsChanged(const QString& path);
 
 	private:
 	struct FileEntry {
@@ -134,6 +141,7 @@ class WallpaperDb : public QObject {
 		QString path;
 		bool isVideo;
 		QByteArray existingCache;
+		QByteArray existingPoster;
 	};
 
 	void openDb();
@@ -144,11 +152,15 @@ class WallpaperDb : public QObject {
 	void queueMetadata(
 		WallpaperEntry* entry,
 		bool isVideo,
-		const QByteArray& existingCache = {});
+		const QByteArray& existingCache = {},
+		const QByteArray& existingPoster = {});
 	void processQueue();
 	void runMetadataJob(const MetadataJob& job);
 	void rebuildEntries();
 
+	void loadCrop(const QString& path, const QString& json);
+	void storeCropJson(const QString& path);
+
 	[[nodiscard]] bool entryAllowed(const WallpaperEntry* entry) const;
 
 	QDir m_dir;
@@ -163,6 +175,8 @@ class WallpaperDb : public QObject {
 	QList<WallpaperEntry*> m_entries;
 	QHash<QString, WallpaperEntry*> m_byPath;
 
+	QHash<QString, QVariantMap> m_crops;
+
 	QVector<MetadataJob> m_queue;
 	QTimer m_queueTimer;
 	bool m_jobRunning = false;