kis_opengl_image_context.h

/*
 *  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 TDESharedPtr<KisOpenGLImageContext> KisOpenGLImageContextSP;
class KisColorSpace;
 
class KRITACORE_EXPORT KisOpenGLImageContext : public TQObject , public TDEShared {
 
    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;
 
    void setSelectionDisplayEnabled(bool enable);
 
    void update(const TQRect& imageRect);
 
signals:
    void sigImageUpdated(TQRect rc);
 
    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. Apparently 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_