Add saving of images from chat log

src/mumble/MainWindow.cpp

@@ -654,12 +654,49 @@ void MainWindow::on_qteLog_customContextMenuRequested(const QPoint &mpos) {
 
 	QPoint contentPosition = QPoint(QApplication::isRightToLeft() ? (qteLog->horizontalScrollBar()->maximum() - qteLog->horizontalScrollBar()->value()) : qteLog->horizontalScrollBar()->value(), qteLog->verticalScrollBar()->value());
 	QMenu *menu = qteLog->createStandardContextMenu(mpos + contentPosition);
+
+	QTextCursor cursor = qteLog->cursorForPosition(mpos);
+	QTextCharFormat fmt = cursor.charFormat();
+	if (fmt.objectType() == QTextFormat::NoObject) {
+		cursor.movePosition(QTextCursor::NextCharacter);
+		fmt = cursor.charFormat();
+	}
+	if (cursor.charFormat().isImageFormat()) {
+		menu->addSeparator();
+		menu->addAction(tr("Save Image As..."), this, SLOT(saveImageAs(void)));
+
+		qtcSaveImageCursor = cursor;
+	}
+
 	menu->addSeparator();
 	menu->addAction(tr("Clear"), qteLog, SLOT(clear(void)));
 	menu->exec(qteLog->mapToGlobal(mpos));
 	delete menu;
 }
 
+void MainWindow::saveImageAs() {
+	QDateTime now = QDateTime::currentDateTime();
+	QString defaultFname = QString::fromLatin1("Mumble-%1.jpg").arg(now.toString(QString::fromLatin1("yyyy-MM-dd-HHmmss")));
+
+	QString fname = QFileDialog::getSaveFileName(this, tr("Save Image File"), defaultFname, tr("Images (*.png *.jpg *.jpeg)"));
+	if (fname.isNull()) {
+		return;
+	}
+
+	QString resName = qtcSaveImageCursor.charFormat().toImageFormat().name();
+	QVariant res = qteLog->document()->resource(QTextDocument::ImageResource, resName);
+	QImage img = res.value<QImage>();
+	bool ok = img.save(fname);
+	if (!ok) {
+		// In case fname did not contain a file extension, try saving with an
+		// explicit format.
+		ok = img.save(fname, "JPG");
+	}
+	if (!ok) {
+		g.l->log(Log::Warning, tr("Could not save image: %1").arg(Qt::escape(fname)));
+	}
+}
+
 static void recreateServerHandler() {
 	ServerHandlerPtr sh = g.sh;
 	if (sh && sh->isRunning()) {

src/mumble/MainWindow.h

@@ -121,6 +121,10 @@ class MainWindow : public QMainWindow, public MessageHandler, public Ui::MainWin
 		bool restartOnQuit;
 		bool bAutoUnmute;
 
+		/// Contains the cursor whose position is immediately before the image to
+		/// save when activating the "Save Image As..." context menu item.
+		QTextCursor qtcSaveImageCursor;
+
 #if QT_VERSION >= 0x050000
 		QPointer<Channel> cContextChannel;
 		QPointer<ClientUser> cuContextUser;
@@ -292,6 +296,8 @@ class MainWindow : public QMainWindow, public MessageHandler, public Ui::MainWin
 		void whisperReleased(QVariant scdata);
 		void onResetAudio();
 		void on_qaFilterToggle_triggered();
+		/// Opens a save dialog for the image referenced by qtcSaveImageCursor.
+		void saveImageAs();
 
 	public:
 		MainWindow(QWidget *parent);