diff --git a/gui/previewgenerator.h b/gui/previewgenerator.h
index 515f9c0..07a923b 100644
--- a/gui/previewgenerator.h
+++ b/gui/previewgenerator.h
@@ -9,7 +9,7 @@
 class PreviewGenerator
 {
   public:
-	virtual PreviewResult *generate(RenderConfig config, QString documentPath, unsigned int page) = 0;
+	virtual QSharedPointer<PreviewResult> generate(RenderConfig config, QString documentPath, unsigned int page) = 0;
 	virtual ~PreviewGenerator()
 	{
 	}
diff --git a/gui/previewgeneratormapfunctor.cpp b/gui/previewgeneratormapfunctor.cpp
index 02ecb3c..4645525 100644
--- a/gui/previewgeneratormapfunctor.cpp
+++ b/gui/previewgeneratormapfunctor.cpp
@@ -10,16 +10,15 @@ void PreviewGeneratorMapFunctor::setRenderConfig(RenderConfig config)
 	this->renderConfig = config;
 }
 
-QSharedPointer<PreviewResult> PreviewGeneratorMapFunctor::operator()(const QSharedPointer<PreviewResult> &renderResult)
+QByteArray PreviewGeneratorMapFunctor::operator()(const RenderTarget &renderTarget)
 {
-	QFileInfo info{renderResult->getDocumentPath()};
+	QFileInfo info{renderTarget.path};
 	PreviewGenerator *previewGenerator = PreviewGenerator::get(info);
 	if(previewGenerator == nullptr)
 	{
-		return QSharedPointer<PreviewResult>();
+		return QByteArray{};
 	}
-	auto preview =
-		previewGenerator->generate(this->renderConfig, renderResult->getDocumentPath(), renderResult->getPage());
+	auto preview = previewGenerator->generate(this->renderConfig, renderTarget.path, renderTarget.page);
 
-	return QSharedPointer<PreviewResult>(preview);
+	return preview->serialize();
 }
diff --git a/gui/previewgeneratormapfunctor.h b/gui/previewgeneratormapfunctor.h
index b390df3..0825d6a 100644
--- a/gui/previewgeneratormapfunctor.h
+++ b/gui/previewgeneratormapfunctor.h
@@ -2,8 +2,9 @@
 #define PREVIEWGENERATORMAPFUNCTOR_H
 
 #include "renderconfig.h"
-#include "previewgenerator.h"
+#include "rendertarget.h"
 
+#include "previewgenerator.h"
 class PreviewGeneratorMapFunctor
 {
 
@@ -16,13 +17,13 @@ class PreviewGeneratorMapFunctor
 	RenderConfig renderConfig;
 
   public:
-	typedef QSharedPointer<PreviewResult> result_type;
+	typedef QByteArray result_type;
 
 	PreviewGeneratorMapFunctor();
 
 	void setRenderConfig(RenderConfig config);
 
-	QSharedPointer<PreviewResult> operator()(const QSharedPointer<PreviewResult> &renderResult);
+	QByteArray operator()(const RenderTarget &renderTarget);
 };
 
 #endif // PREVIEWGENERATORMAPFUNCTOR_H
diff --git a/gui/previewgeneratorpdf.cpp b/gui/previewgeneratorpdf.cpp
index 092d5c6..be81f1e 100644
--- a/gui/previewgeneratorpdf.cpp
+++ b/gui/previewgeneratorpdf.cpp
@@ -1,6 +1,5 @@
 #include <QMutexLocker>
 #include <QPainter>
-
 #include "previewgeneratorpdf.h"
 
 static QMutex cacheMutex;
@@ -24,18 +23,18 @@ Poppler::Document *PreviewGeneratorPdf::document(QString path)
 	return result;
 }
 
-PreviewResult *PreviewGeneratorPdf::generate(RenderConfig config, QString documentPath, unsigned int page)
+QSharedPointer<PreviewResult> PreviewGeneratorPdf::generate(RenderConfig config, QString documentPath,
+															unsigned int page)
 {
 	PreviewResultPdf *result = new PreviewResultPdf(documentPath, page);
-
 	Poppler::Document *doc = document(documentPath);
 	if(doc == nullptr)
 	{
-		return result;
+		return QSharedPointer<PreviewResult>(result);
 	}
 	if(doc->isLocked())
 	{
-		return result;
+		return QSharedPointer<PreviewResult>(result);
 	}
 	int p = (int)page - 1;
 	if(p < 0)
@@ -55,5 +54,5 @@ PreviewResult *PreviewGeneratorPdf::generate(RenderConfig config, QString docume
 		}
 	}
 	result->previewImage = img;
-	return result;
+	return QSharedPointer<PreviewResult>(result);
 }
diff --git a/gui/previewgeneratorpdf.h b/gui/previewgeneratorpdf.h
index 29bd586..74c63ff 100644
--- a/gui/previewgeneratorpdf.h
+++ b/gui/previewgeneratorpdf.h
@@ -13,7 +13,7 @@ class PreviewGeneratorPdf : public PreviewGenerator
   public:
 	using PreviewGenerator::PreviewGenerator;
 
-	PreviewResult *generate(RenderConfig config, QString documentPath, unsigned int page);
+	QSharedPointer<PreviewResult> generate(RenderConfig config, QString documentPath, unsigned int page);
 
 	~PreviewGeneratorPdf()
 	{
diff --git a/gui/previewgeneratorplaintext.cpp b/gui/previewgeneratorplaintext.cpp
index a0e4656..4fcaac7 100644
--- a/gui/previewgeneratorplaintext.cpp
+++ b/gui/previewgeneratorplaintext.cpp
@@ -3,13 +3,14 @@
 #include "previewgeneratorplaintext.h"
 #include "previewresultplaintext.h"
 
-PreviewResult *PreviewGeneratorPlainText::generate(RenderConfig config, QString documentPath, unsigned int page)
+QSharedPointer<PreviewResult> PreviewGeneratorPlainText::generate(RenderConfig config, QString documentPath,
+																  unsigned int page)
 {
 	PreviewResultPlainText *result = new PreviewResultPlainText(documentPath, page);
 	QFile file(documentPath);
 	if(!file.open(QFile::ReadOnly | QFile::Text))
 	{
-		return result;
+		return QSharedPointer<PreviewResultPlainText>(result);
 	}
 	QTextStream in(&file);
 
@@ -77,5 +78,5 @@ PreviewResult *PreviewGeneratorPlainText::generate(RenderConfig config, QString
 	header += "<hr>";
 
 	result->setText(header + resulText.replace("\n", "<br>"));
-	return result;
+	return QSharedPointer<PreviewResultPlainText>(result);
 }
diff --git a/gui/previewgeneratorplaintext.h b/gui/previewgeneratorplaintext.h
index be7cc00..49c62bb 100644
--- a/gui/previewgeneratorplaintext.h
+++ b/gui/previewgeneratorplaintext.h
@@ -6,7 +6,7 @@ class PreviewGeneratorPlainText : public PreviewGenerator
 {
   public:
 	using PreviewGenerator::PreviewGenerator;
-	PreviewResult *generate(RenderConfig config, QString documentPath, unsigned int page);
+	QSharedPointer<PreviewResult> generate(RenderConfig config, QString documentPath, unsigned int page);
 };
 
 #endif // PREVIEWGENERATORPLAINTEXT_H