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diff --git a/chalk/ui/kis_opengl_image_context.h b/chalk/ui/kis_opengl_image_context.h
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+++ b/chalk/ui/kis_opengl_image_context.h
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+/*
+ *  Copyright (c) 2005 Adrian Page <adrian@pagenet.plus.com>
+ *
+ *  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.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+#ifndef KIS_OPENGL_IMAGE_CONTEXT_H_
+#define KIS_OPENGL_IMAGE_CONTEXT_H_
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#ifdef HAVE_GL
+
+#include <map>
+
+#include <tqgl.h>
+#include <tqobject.h>
+#include <tqvaluevector.h>
+
+#include <koffice_export.h>
+
+#include "kis_types.h"
+
+class TQRegion;
+
+class KisOpenGLImageContext;
+typedef KSharedPtr<KisOpenGLImageContext> KisOpenGLImageContextSP;
+class KisColorSpace;
+
+class KRITACORE_EXPORT KisOpenGLImageContext : public TQObject , public KShared {
+
+    Q_OBJECT
+  TQ_OBJECT
+
+public:
+    static KisOpenGLImageContextSP getImageContext(KisImageSP image, KisProfile *monitorProfile);
+
+    KisOpenGLImageContext();
+    virtual ~KisOpenGLImageContext();
+
+public:
+    // In order to use the image textures, the caller must pass
+    // the sharedContextWidget() as the shareWidget argument to the 
+    // TQGLWidget constructor.
+    TQGLWidget *sharedContextWidget() const;
+
+    void setMonitorProfile(KisProfile *profile);
+    void setHDRExposure(float exposure);
+
+    GLuint backgroundTexture() const;
+
+    static const int BACKGROUND_TEXTURE_WIDTH = 32;
+    static const int BACKGROUND_TEXTURE_HEIGHT = 32;
+
+    // Get the image texture tile containing the point (pixelX, pixelY).
+    GLuint imageTextureTile(int pixelX, int pixelY) const;
+
+    int imageTextureTileWidth() const;
+    int imageTextureTileHeight() const;
+
+    /**
+     * Select selection visualisation rendering.
+     * 
+     * @param enable Set to true to enable selection visualisation rendering.
+     */
+    void setSelectionDisplayEnabled(bool enable);
+
+    /**
+     * Update the image textures for the given image rectangle.
+     * 
+     * @param imageRect The rectangle to update in image coordinates.
+     */
+    void update(const TQRect& imageRect);
+
+signals:
+    /**
+     * Clients using the KisOpenGLImageContext should connect to the
+     * following signals rather than to the KisImage's own equivalent
+     * signals. This ensures that the image textures are always up to date
+     * when used.
+     */
+
+    /**
+     * Emitted whenever an action has caused the image to be recomposited.
+     *
+     * @param rc     The rect that has been recomposited.
+     */
+    void sigImageUpdated(TQRect rc);
+
+    /**
+     * Emitted whenever the image size changes.
+     *
+     * @param width  New image width 
+     * @param height New image height
+     */
+    void sigSizeChanged(TQ_INT32 width, TQ_INT32 height);
+
+protected:
+    KisOpenGLImageContext(KisImageSP image, KisProfile *monitorProfile);
+
+    void generateBackgroundTexture();
+    void createImageTextureTiles();
+    void destroyImageTextureTiles();
+    int imageTextureTileIndex(int x, int y) const;
+    void updateImageTextureTiles(const TQRect& rect);
+
+    static KisColorSpace* textureColorSpaceForImageColorSpace(KisColorSpace *imageColorSpace);
+    static bool imageCanShareImageContext(KisImageSP image);
+
+protected slots:
+    void slotImageUpdated(TQRect r);
+    void slotImageSizeChanged(TQ_INT32 w, TQ_INT32 h);
+
+private:
+    KisImageSP m_image;
+    KisProfile *m_monitorProfile;
+    float m_exposure;
+    bool m_displaySelection;
+
+    GLuint m_backgroundTexture;
+
+    static const int PREFERRED_IMAGE_TEXTURE_WIDTH = 256;
+    static const int PREFERRED_IMAGE_TEXTURE_HEIGHT = 256;
+
+    TQValueVector<GLuint> m_imageTextureTiles;
+    int m_imageTextureTileWidth;
+    int m_imageTextureTileHeight;
+    int m_numImageTextureTileColumns;
+
+    // We create a single OpenGL context and share it between all views
+    // in the process. Aptqparently with some OpenGL implementations, only
+    // one context will be hardware accelerated.
+    static TQGLWidget *SharedContextWidget;
+    static int SharedContextWidgetRefCount;
+
+    typedef std::map<KisImageSP, KisOpenGLImageContext*> ImageContextMap;
+
+    static ImageContextMap imageContextMap;
+};
+
+#endif // HAVE_GL
+
+#endif // KIS_OPENGL_IMAGE_CONTEXT_H_
+