1 files changed, 26 insertions, 0 deletions
diff --git a/core/imagedownloader.h b/core/imagedownloader.h
index 337185869..d8e9d2d7d 100644
--- a/core/imagedownloader.h
+++ b/core/imagedownloader.h
@@ -5,6 +5,7 @@
 #include <QImage>
 #include <QFuture>
 #include <QNetworkReply>
+#include <QThreadPool>
 
 class ImageDownloader : public QObject {
 	Q_OBJECT
@@ -18,6 +19,31 @@ private:
 	QString filename;
 };
 
+class PictureEntry;
+class Thumbnailer : public QObject {
+	Q_OBJECT
+public:
+	static Thumbnailer *instance();
+
+	// Schedule a thumbnail for fetching or calculation.
+	// Returns a placehlder thumbnail. The actual thumbnail will be sent
+	// via a signal later.
+	QImage fetchThumbnail(PictureEntry &entry, int size);
+
+	// If we change dive, clear all unfinished thumbnail creations
+	void clearWorkQueue();
+signals:
+	void thumbnailChanged(QString filename, QImage thumbnail);
+private:
+	Thumbnailer();
+	void processItem(QString filename, int size);
+
+	mutable QMutex lock;
+	QThreadPool pool;
+
+	QMap<QString,QFuture<void>> workingOn;
+};
+
 QImage getHashedImage(const QString &filename);
 
 #endif // IMAGEDOWNLOADER_H