/*
 * crt.h:
 *
 * Copyright (c) 2008 James McKenzie <james@fishsoup.dhs.org>,
 * All rights reserved.
 *
 */

/*
 * $Id$
 */

/*
 * $Log$
 * Revision 1.3  2008/02/06 11:30:37  james
 * *** empty log message ***
 *
 * Revision 1.2  2008/02/04 20:23:55  james
 * *** empty log message ***
 *
 * Revision 1.1  2008/02/03 23:31:25  james
 * *** empty log message ***
 *
 */

#ifndef __CRT_H__
#define __CRT_H__

#define CRT_ROWS 25
#define CRT_COLS 80

#define CRT_CELS (CRT_ROWS*CRT_COLS)
#define CRT_ADDR(r,c) (((r)*CRT_COLS)+(c))
#define CRT_ADDR_POS(p) ((((p)->y)*CRT_COLS)+((p)->x))

#define CRT_ATTR_NORMAL    0x0
#define CRT_ATTR_UNDERLINE 0x1
#define CRT_ATTR_REVERSE   0x2
#define CRT_ATTR_BLINK	   0x4
#define CRT_ATTR_BOLD	   0x8

typedef struct
{
  uint8_t chr;
  uint8_t attr;
} CRT_CA;

typedef struct
{
  int x;
  int y;
} CRT_Pos;


typedef struct
{
  CRT_CA screen[CRT_CELS];
  CRT_Pos pos;
  int hide_cursor;
} CRT;


static inline
crt_ca_cmp (CRT_CA a, CRT_CA b)
{
  return memcmp (&a, &b, sizeof (a));
}

#endif /* __CRT_H__ */