/*  display.h

	Header file for my display packages.
	John Watlington, 10/25/95
*/

/*  One of the following flags must be set, determining which
    routines are being used.   */

#undef   USE_PRINTF
#define  USE_X

#ifdef USE_X
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/Xos.h>
#endif

#define DISPLAY_MAX_COLORS    256     /* limit to 8bit display */
#define DISPLAY_DEPTH         8

#define DISPLAY_MAX_WINDOWS   8       /* may be increased */

/*  This data type is used to represent a particular window to
    the application.    */

typedef int window_tag;

/******************************************************************
	The following variables must unfortunately be declared globally
	in order to access them through preprocessor macros (desirable
	for speed)
*/

typedef struct {
#ifdef USE_X
  Window     W;
  GC         Gc;
  XImage     *I;
#endif
  unsigned char *image;
  int        x_size;
  int        y_size;
  int        num_levels;
  int        min;
  int        delta;
} window_desc;

extern window_desc window_desc_table[];

/******************************************************************
	These are the function prototypes
*/

window_tag display_init_window( char *name, int x_size, int y_size,
			       int num_levels );
void display_update( window_tag id );

void display_set_scale( window_tag id, int min, int max );
	
/*  The following are actually implemented as preprocessor macros...

unsigned char *display_get_image( window_tag );
void display_set_pixel( window_tag id, int x, int y,
               unsigned char raw_pixel_value );

void display_set_spixel( window_tag, x, y, scaled_value )
void display_set_fpixel( window_tag, x, y, scaled_value_float )
*/

#define display_get_image( id )  (window_desc_table[ (id) ].image)
#define display_set_pixel( id, x, y, raw ) ( \
     *(window_desc_table[ (id) ].image + (x) + \
	   (window_desc_table[ (id) ].x_size * (y))) \
	  = (unsigned char)(raw) )

#define display_set_spixel( id, x, y, value ) ()
#define display_set_fpixel( id, x, y, fvalue ) ()