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diff --git a/kpdf/core/generator.h b/kpdf/core/generator.h
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+/***************************************************************************
+ *   Copyright (C) 2004 by Enrico Ros <eros.kde@email.it>                  *
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ ***************************************************************************/
+
+#ifndef _KPDF_GENERATOR_H_
+#define _KPDF_GENERATOR_H_
+
+#include <qobject.h>
+#include <qvaluevector.h>
+#include <qstring.h>
+#include "core/document.h"
+class KListView;
+class KPrinter;
+class KPDFPage;
+class KPDFLink;
+class PixmapRequest;
+
+/* Note: on contents generation and asyncronous queries.
+ * Many observers may want to request data syncronously or asyncronously.
+ * - Sync requests. These should be done in-place.
+ * - Async request must be done in real background. That usually means a
+ *   thread, such as QThread derived classes.
+ * Once contents are available, they must be immediately stored in the
+ * KPDFPage they refer to, and a signal is emitted as soon as storing
+ * (even for sync or async queries) has been done.
+ */
+
+/**
+ * @short [Abstract Class] The information generator.
+ *
+ * Most of class members are pure virtuals and they must be implemented to
+ * provide a class that builds contents (graphics and text).
+ *
+ * Generation/query is requested by the 'KPDFDocument' class only, and that
+ * class stores the resulting data into 'KPDFPage's. The data will then be
+ * displayed by the GUI components (pageView, thumbnailList, etc..).
+ */
+class Generator : public QObject
+{
+    public:
+        /** virtual methods to reimplement **/
+        // load a document and fill up the pagesVector
+        virtual bool loadDocument( const QString & fileName, QValueVector< KPDFPage * > & pagesVector ) = 0;
+
+        // Document description and Table of contents
+        virtual const DocumentInfo * generateDocumentInfo() { return 0L; }
+        virtual const DocumentSynopsis * generateDocumentSynopsis() { return 0L; }
+
+        // DRM handling
+        virtual bool isAllowed( int /*Document::Permisison(s)*/ ) { return true; }
+
+        // page contents generation
+        virtual bool canGeneratePixmap() = 0;
+        virtual void generatePixmap( PixmapRequest * request ) = 0;
+        virtual void generateSyncTextPage( KPDFPage * page ) = 0;
+
+        // capability querying
+        virtual bool supportsSearching() const = 0;
+        virtual bool hasFonts() const = 0;
+
+        // font related
+        virtual void putFontInfo(KListView *list) = 0;
+
+        // print document using already configured kprinter
+        virtual bool print( KPrinter& /*printer*/ ) { return false; }
+        // access meta data of the generator
+        virtual QString getMetaData( const QString &/*key*/, const QString &/*option*/ ) { return QString(); }
+        // tell generator to re-parse configuration and return true if something changed
+        virtual bool reparseConfig() { return false; }
+
+        /** 'signals' to send events the KPDFDocument **/
+        // tell the document that the job has been completed
+        void signalRequestDone( PixmapRequest * request ) { m_document->requestDone( request ); }
+
+        /** constructor: takes the Document as a parameter **/
+        Generator( KPDFDocument * doc ) : m_document( doc ) {};
+
+    protected:
+        KPDFDocument * m_document;
+
+    private:
+        Generator();
+};
+
+/**
+ * @short Describes a pixmap type request.
+ */
+struct PixmapRequest
+{
+    PixmapRequest( int rId, int n, int w, int h, int p, bool a = false )
+        : id( rId ), pageNumber( n ), width( w ), height( h ),
+        priority( p ), async( a ), page( 0 )  {};
+
+    // observer id
+    int id;
+    // page number and size
+    int pageNumber;
+    int width;
+    int height;
+    // asyncronous request priority (less is better, 0 is max)
+    int priority;
+    // generate the pixmap in a thread and notify observer when done
+    bool async;
+
+    // this field is set by the Docuemnt prior passing the
+    // request to the generator
+    KPDFPage * page;
+};
+
+#endif