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diff --git a/util/fbcompose/plugins/opengl/preview/PreviewPlugin.hh b/util/fbcompose/plugins/opengl/preview/PreviewPlugin.hh
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+/** PreviewPlugin.hh file for the fluxbox compositor. */
+
+// Copyright (c) 2011 Gediminas Liktaras (gliktaras at gmail dot com)
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+
+#ifndef FBCOMPOSITOR_PLUGIN_OPENGL_PREVIEW_PREVIEWPLUGIN_HH
+#define FBCOMPOSITOR_PLUGIN_OPENGL_PREVIEW_PREVIEWPLUGIN_HH
+
+
+#include "Enumerations.hh"
+#include "OpenGLPlugin.hh"
+#include "OpenGLResources.hh"
+#include "OpenGLShaders.hh"
+#include "TickTracker.hh"
+
+#include "FbTk/FbString.hh"
+
+#include <GL/glew.h>
+#include <GL/gl.h>
+
+#include <X11/Xlib.h>
+
+#include <map>
+#include <vector>
+
+
+namespace FbCompositor {
+
+    class BaseScreen;
+    class OpenGLScreen;
+    class OpenGLWindow;
+
+
+    /**
+     * Provides window preview feature for the iconbar.
+     */
+    class PreviewPlugin : public OpenGLPlugin {
+        struct PreviewWindowData;
+
+    public :
+        //--- CONSTRUCTORS AND DESTRUCTORS -------------------------------------
+
+        /** Constructor. */
+        PreviewPlugin(const BaseScreen &screen, const std::vector<FbTk::FbString> &args);
+
+        /** Destructor. */
+        ~PreviewPlugin();
+
+
+        //--- ACCESSORS --------------------------------------------------------
+
+        /** \returns the name of the plugin. */
+        const char *pluginName() const;
+
+
+        /** \returns the additional source code for the fragment shader. */
+        const char *fragmentShader() const;
+
+        /** \returns the additional source code for the vertex shader. */
+        const char *vertexShader() const;
+
+
+        //--- WINDOW EVENT CALLBACKS -------------------------------------------
+
+        /** Called, whenever a new window is created. */
+        void windowCreated(const BaseCompWindow &window);
+
+        /** Called, whenever a window is destroyed. */
+        void windowDestroyed(const BaseCompWindow &window);
+
+
+        //--- RENDERING ACTIONS ------------------------------------------------
+
+        /** Extra rendering actions and jobs. */
+        const std::vector<OpenGLRenderingJob> &extraRenderingActions();
+
+
+    private :
+        //--- INTERNAL FUNCTIONS -----------------------------------------------
+
+        /** Update the preview window. */
+        void updatePreviewWindow(PreviewWindowData &win_preview);
+
+
+        //--- GENERAL RENDERING VARIABLES --------------------------------------
+
+        /** Vector, containing the plugin's extra rendering jobs. */
+        std::vector<OpenGLRenderingJob> m_extra_jobs;
+
+
+        /** Timer that signals when the preview window should appear. */
+        TickTracker m_tick_tracker;
+
+
+        //--- PREVIEW WINDOW DATA ----------------------------------------------
+
+        /** Holds data about the preview window. */
+        struct PreviewWindowData {
+            const OpenGLWindow &window;     ///< The corresponding window object.
+            OpenGLRenderingJob job;         ///< Rendering job of this preview object.
+        };
+
+        /** A list of potential preview windows. */
+        std::map<Window, PreviewWindowData> m_preview_data;
+    };
+
+
+    //--- INLINE FUNCTIONS -----------------------------------------------------
+
+    // Returns the name of the plugin.
+    inline const char *PreviewPlugin::pluginName() const {
+        return "preview";
+    }
+}
+
+
+//--- PLUGIN MANAGER FUNCTIONS -------------------------------------------------
+
+/** Creates a plugin object. */
+extern "C" FbCompositor::BasePlugin *createPlugin(const FbCompositor::BaseScreen &screen, const std::vector<FbTk::FbString> &args);
+
+/** \returns the type of the plugin. */
+extern "C" FbCompositor::PluginType pluginType();
+
+
+#endif  // FBCOMPOSITOR_PLUGIN_OPENGL_PREVIEW_PREVIEWPLUGIN_HH