scfxn.h

PIXIL is a small footprint operating environment, complete with PDA PIM applications, a browser and

/*                                                                       
 * Copyright (c) 2003 Century Software, Inc.   All Rights Reserved.     
 *                                                                       
 * This file is part of the PIXIL Operating Environment                 
 *                                                                       
 * The use, copying and distribution of this file is governed by one    
 * of two licenses, the PIXIL Commercial License, or the GNU General    
 * Public License, version 2.                                           
 *                                                                       
 * Licensees holding a valid PIXIL Commercial License may use this file 
 * in accordance with the PIXIL Commercial License Agreement provided   
 * with the Software. Others are governed under the terms of the GNU   
 * General Public License version 2.                                    
 *                                                                       
 * This file may be distributed and/or modified under the terms of the  
 * GNU General Public License version 2 as published by the Free        
 * Software Foundation and appearing in the file LICENSE.GPL included   
 * in the packaging of this file.                                      
 *                                                                       
 * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING  
 * THE WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A            
 * PARTICULAR PURPOSE.                                                  
 *                                                                       
 * RESTRICTED RIGHTS LEGEND                                             
 *                                                                     
 * Use, duplication, or disclosure by the government is subject to      
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 * Technical Data and Computer Software clause in DAR 7-104.9(a).       
 *                                                                      
 * See http://www.pixil.org/gpl/ for GPL licensing       
 * information.                                                         
 *                                                                      
 * See http://www.pixil.org/license.html or              
 * email [e-mail] for information about the PIXIL   
 * Commercial License Agreement, or if any conditions of this licensing 
 * are not clear to you.                                                
 */



#ifndef		SCFXN_INCLUDED
#define		SCFXN_INCLUDED	1

#ifdef __cplusplus
extern "C"
{
#endif

/* System header files */


/* Local header files */


/* Typedefs, macro, enum/struct/union definitions */
    typedef struct
    {
	unsigned char red,	// Red value
	  green,		// Green value
	  blue;			// Blue value
    }
    rgbTriplet;

#define		RGB2PIXEL565(r,g,b) \
				((((r) & 0xf8) << 8) | (((g) & 0xfc) << 3) | (((b) & 0xf8) >> 3))
#define		RGB2PIXEL888(r,g,b) \
				(((r) << 16) | ((g) << 8) | (b))

#define PI 3.14159265358979323846
#define EPSILON 1E-6

#define abs(x) ((x) < 0 ? (-(x)) : x)	/* Absolute value */
#define sgn(x) (((x) < 0) ? -1 : ((x) > 0 ? 1 : 0))	/* Extract sign */
#define dtr(x) ((x) * (PI / 180.0))	/* Degree->Radian */
#define rtd(x) ((x) / (PI / 180.0))	/* Radian->Degree */
#define fixangle(a) ((a) - 360.0 * (floor((a) / 360.0)))	/* Fix angle    */


/* Function prototypes */
    void nxsunimage(unsigned char *srcpix, unsigned char *dstpix, int width,
		    int height, int depth);
    void read_pixel(unsigned char *data, int x, int y, int bpp, int xsize,
		    rgbTriplet * pixel);
    void darken_pixel(rgbTriplet * pixel, double val);
    void write_pixel(unsigned char *data, int x, int y, int bpp, int xsize,
		     rgbTriplet * pixel);

/* functions in astro.c */
    long jdate(struct tm *t);
    double jtime(struct tm *t);
    double kepler(double m, double ecc);
    void sunpos(double jd, int apparent, double *ra, double *dec, double *rv,
		double *slong);
    double gmst(double jd);

#ifdef __cplusplus
}
#endif

#endif				//      SCFXN_INCLUDED