mtsgui: handle the -o parameter

src/mtsgui/mainwindow.cpp

@@ -264,9 +264,11 @@ MainWindow::~MainWindow() {
 
 bool MainWindow::initWorkersProcessArgv() {
 	QSettings settings;
-	QStringList args = qApp->arguments(), toBeLoaded;
+	QStringList args = qApp->arguments();
+	std::vector<std::pair<QString, QString> > toBeLoaded;
 	int localWorkerCount = settings.value("localWorkers", getCoreCount()).toInt();
 	ref<Scheduler> scheduler = Scheduler::getInstance();
+	QString outputFile("");
 
 	for (int i=1; i<args.count(); ++i) {
 		if (args[i].startsWith("-D")) {
@@ -282,6 +284,10 @@ bool MainWindow::initWorkersProcessArgv() {
 			if (value.length() == 0 && i+1<args.count())
 				value = args[++i];
 			resolver->appendPath(value.toStdString());
+		} else if (args[i].startsWith("-o")) {
+			outputFile = args[i].mid(2);
+			if (outputFile.length() == 0 && i+1<args.count())
+				outputFile = args[++i];
 		} else if (args[i].startsWith("-p")) {
 			QString value = args[i].mid(2);
 			if (value.length() == 0 && i+1<args.count())
@@ -297,6 +303,7 @@ bool MainWindow::initWorkersProcessArgv() {
 			cout <<  "Options/Arguments:" << endl;
 			cout <<  "   -h          Display this help text" << endl << endl;
 			cout <<  "   -D key=val  Define a constant, which can referenced as \"$key\" in the scene" << endl << endl;
+			cout <<  "   -o fname    Write the output image to the file denoted by \"fname\"" << endl << endl;
 			cout <<  "   -a p1;p2;.. Add one or more entries to the resource search path" << endl << endl;
 			cout <<  "   -p count    Override the detected number of processors." << endl << endl;
 			cout <<  " For documentation, please refer to http://www.mitsuba-renderer.org/docs.html" << endl;
@@ -304,7 +311,8 @@ bool MainWindow::initWorkersProcessArgv() {
 		} else if (args[i].startsWith("-")) {
 			cerr << "Unknown option \"" << args[i].toStdString() << "\"" << endl;
 		} else {
-			toBeLoaded.append(args[i]);
+			toBeLoaded.push_back(std::make_pair(args[i], outputFile));
+			outputFile = QString("");
 		}
 	}
 
@@ -365,7 +373,7 @@ bool MainWindow::initWorkersProcessArgv() {
 	}
 
 	for (int i=0; i<toBeLoaded.size(); ++i)
-		loadFile(toBeLoaded[i]);
+		loadFile(toBeLoaded[i].first, toBeLoaded[i].second);
 
 	scheduler->start();
 	raise();
@@ -657,7 +665,7 @@ void MainWindow::onClearRecent() {
 	settings.setValue("recentFileList", QStringList());
 }
 
-SceneContext *MainWindow::loadScene(const QString &qFileName) {
+SceneContext *MainWindow::loadScene(const QString &qFileName, const QString &destFile) {
 	ref<FileResolver> resolver = Thread::getThread()->getFileResolver();
 	fs::path filename = resolver->resolve(toFsPath(qFileName));
 	fs::path filePath = fs::absolute(filename).parent_path();
@@ -674,7 +682,7 @@ SceneContext *MainWindow::loadScene(const QString &qFileName) {
 	loaddlg->show();
 
 retry:
-	loadingThread = new SceneLoader(newResolver, filename, m_parameters);
+	loadingThread = new SceneLoader(newResolver, filename, toFsPath(destFile), m_parameters);
 	loadingThread->start();
 
 	while (loadingThread->isRunning()) {
@@ -735,11 +743,11 @@ retry:
 	return result;
 }
 
-void MainWindow::loadFile(QString filename) {
+void MainWindow::loadFile(QString filename, const QString &destFile) {
 	QFileInfo fInfo(filename);
 	fInfo.makeAbsolute();
 
-	SceneContext *context = loadScene(filename);
+	SceneContext *context = loadScene(filename, destFile);
 	if (context == NULL)
 		return;
 	m_contextMutex.lock();

src/mtsgui/mainwindow.h

@@ -117,13 +117,13 @@ class MainWindow : public QMainWindow {
 public:
     MainWindow(QWidget *parent = 0);
     ~MainWindow();
-	void loadFile(QString filename);
+	void loadFile(QString filename, const QString &destFile = "");
 	void adjustSize();
 	bool isActive();
 	bool initWorkersProcessArgv();
 
 protected:
-	SceneContext *loadScene(const QString &filename);
+	SceneContext *loadScene(const QString &filename, const QString &destFile = "");
 	void resizeEvent(QResizeEvent *event);
     void changeEvent(QEvent *e);
 	void updateRecentFileActions();

src/mtsgui/sceneloader.cpp

@@ -32,8 +32,8 @@
 XERCES_CPP_NAMESPACE_USE
 
 SceneLoader::SceneLoader(FileResolver *resolver, const fs::path &filename,
-	const std::map<std::string, std::string, SimpleStringOrdering> &parameters)
-	: Thread("load"), m_resolver(resolver), m_filename(fromFsPath(filename)),
+		const fs::path &destFile, const std::map<std::string, std::string, SimpleStringOrdering> &parameters)
+	: Thread("load"), m_resolver(resolver), m_filename(fromFsPath(filename)), m_destFile(destFile),
 	  m_parameters(parameters) {
 	m_wait = new WaitFlag();
 	m_versionError = false;
@@ -115,7 +115,7 @@ void SceneLoader::run() {
 			ref<Scene> scene = handler->getScene();
 
 			scene->setSourceFile(filename);
-			scene->setDestinationFile(filePath / baseName);
+			scene->setDestinationFile(m_destFile.empty() ? (filePath / baseName) : m_destFile);
 			scene->initialize();
 
 			if (scene->getIntegrator() == NULL)

src/mtsgui/sceneloader.h

@@ -30,6 +30,7 @@ class SceneLoader : public Thread {
 public:
 	SceneLoader(FileResolver *resolver,
 			const fs::path &filename,
+			const fs::path &destFile,
 			const std::map<std::string, std::string, SimpleStringOrdering> &parameters);
 	void run();
 
@@ -47,6 +48,7 @@ private:
 	SceneContext *m_result;
 	std::string m_error;
 	const QString m_filename;
+	fs::path m_destFile;
 	bool m_versionError;
 	Version m_version;
 	const std::map<std::string, std::string, SimpleStringOrdering> &m_parameters;