Manager now sets ocrLanguage instead of recognizer. Last one checks input item for validity.

Manager.cpp

@@ -170,6 +170,10 @@ void Manager::applySettings () {
   QNetworkProxy::setApplicationProxy (proxy);
   settings.endGroup ();
 
+  settings.beginGroup (settings_names::recogntionGroup);
+  defaultOrcLanguage_ = GET (ocrLanguage).toString ();
+  settings.endGroup ();
+
   settings.beginGroup (settings_names::translationGroup);
   defaultTranslationLanguage_ = GET (translationLanguage).toString ();
   doTranslation_ = GET (doTranslation).toBool ();
@@ -215,6 +219,12 @@ void Manager::handleSelection (ProcessingItem item) {
   if ((doTranslation_ && !altMod) || (!doTranslation_ && altMod)) {
     item.translateLanguage = defaultTranslationLanguage_;
   }
+  if (item.ocrLanguage.isEmpty ()) {
+    item.ocrLanguage = defaultOrcLanguage_;
+  }
+  if (item.sourceLanguage.isEmpty ()) {
+    item.sourceLanguage = dictionary_->ocrToTranslateCodes (item.ocrLanguage);
+  }
   emit requestRecognize (item);
   ++itemProcessingCount_;
   updateNormalIcon ();

Manager.h

@@ -71,6 +71,7 @@ class Manager : public QObject {
     //! Used threads. For proper termination.
     QList<QThread *> threads_;
     QString defaultTranslationLanguage_;
+    QString defaultOrcLanguage_;
     bool doTranslation_;
     int itemProcessingCount_;
 };

ProcessingItem.cpp

@@ -1,9 +1,12 @@
 #include "ProcessingItem.h"
 
-bool ProcessingItem::isValid () const {
+bool ProcessingItem::isValid (bool checkOnlyInput) const {
   bool valid = true;
   valid &= (!screenPos.isNull ());
   valid &= (!source.isNull ());
-  valid &= (!recognized.isEmpty ());
+  valid &= (!ocrLanguage.isEmpty ());
+  if (!checkOnlyInput) {
+    valid &= (!recognized.isEmpty ());
+  }
   return valid;
 }

ProcessingItem.h

@@ -15,7 +15,7 @@ struct ProcessingItem {
 
   Qt::KeyboardModifiers modifiers;
 
-  bool isValid () const;
+  bool isValid (bool checkOnlyInput = false) const;
 };
 Q_DECLARE_METATYPE (ProcessingItem)
 

Recognizer.cpp

@@ -56,9 +56,11 @@ bool Recognizer::initEngine (tesseract::TessBaseAPI * &engine, const QString &la
 }
 
 void Recognizer::recognize (ProcessingItem item) {
-  ST_ASSERT (!item.source.isNull ());
-  bool isCustomLanguage = (!item.ocrLanguage.isEmpty () &&
-                           item.ocrLanguage != ocrLanguage_);
+  if (!item.isValid (true)) {
+    emit recognized (item);
+    return;
+  }
+  bool isCustomLanguage = (item.ocrLanguage != ocrLanguage_);
   tesseract::TessBaseAPI *engine = (isCustomLanguage) ? NULL : engine_;
   QString language = (isCustomLanguage) ? item.ocrLanguage : ocrLanguage_;
   if (engine == NULL) {