image.h

/* SLiM - Simple Login Manager
   Copyright (C) 2004-06 Simone Rota <sip@varlock.com>
   Copyright (C) 2004-06 Johannes Winkelmann <jw@tks6.net>
      
   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.
   
   The following code has been adapted and extended from
   xplanet 1.0.1, Copyright (C) 2002-04 Hari Nair <hari@alumni.caltech.edu>
*/

#ifndef _IMAGE_H_
#define _IMAGE_H_

#include <X11/Xlib.h>
#include <X11/Xmu/WinUtil.h>

class Image {
public:
    Image();
    Image(const int w, const int h, const unsigned char *rgb,
          const unsigned char *alpha);

    ~Image();

    const unsigned char * getPNGAlpha() const {
        return(png_alpha);
    };
    const unsigned char * getRGBData() const {
        return(rgb_data);
    };

    void getPixel(double px, double py, unsigned char *pixel);
    void getPixel(double px, double py, unsigned char *pixel,
                  unsigned char *alpha);

    int Width() const  {
        return(width);
    };
    int Height() const {
        return(height);
    };
    void Quality(const int q) {
        quality_ = q;
    };

    bool Read(const char *filename);

    void Reduce(const int factor);
    void Resize(const int w, const int h);
    void Merge(Image* background, const int x, const int y);
    void Crop(const int x, const int y, const int w, const int h);
    void Tile(const int w, const int h);
    void Center(const int w, const int h, const char *hex);
    void Plain(const int w, const int h, const char *hex);
    
    void computeShift(unsigned long mask, unsigned char &left_shift,
                      unsigned char &right_shift);

    Pixmap createPixmap(Display* dpy, int scr, Window win);


private:
    int width, height, area;
    unsigned char *rgb_data;
    unsigned char *png_alpha;

    int quality_;
};

#endif