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

/* 
 * $Id$
 */

/* 
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#ifndef __CRT_H__
#define __CRT_H__

#define CRT_ROWS 60
#define CRT_COLS 132

#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


#define CRT_COLOR_BLACK		0x0
#define CRT_COLOR_RED		0x1
#define CRT_COLOR_GREEN		0x2
#define CRT_COLOR_YELLOW	0x3
#define CRT_COLOR_BLUE		0x4
#define CRT_COLOR_MAGENTA	0x5
#define CRT_COLOR_CYAN		0x6
#define CRT_COLOR_WHITE		0x7
#define CRT_COLOR_INTENSITY	0x8

#define CRT_COLOR_FG_MASK	0xf0
#define CRT_COLOR_FG_SHIFT	4

#define CRT_COLOR_BG_MASK	0xf
#define CRT_COLOR_BG_SHIFT	0

#define CRT_COLOR_BG(a)		(((a) & CRT_COLOR_BG_MASK) >> CRT_COLOR_BG_SHIFT)
#define CRT_COLOR_FG(a)		(((a) & CRT_COLOR_FG_MASK) >> CRT_COLOR_FG_SHIFT)

#define CRT_MAKE_COLOR(f,b)	(((f) << CRT_COLOR_FG_SHIFT)|(b))

#define CRT_BGCOLOR_NORMAL	CRT_COLOR_BLACK
#define CRT_FGCOLOR_NORMAL	CRT_COLOR_WHITE

#define CRT_COLOR_NORMAL	CRT_MAKE_COLOR(CRT_FGCOLOR_NORMAL,CRT_BGCOLOR_NORMAL)

typedef struct __attribute__ ((packed))
{
  uint32_t chr;
  uint8_t attr;
  uint8_t color;
} CRT_CA;

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


typedef struct
{
  CRT_Pos s;
  CRT_Pos e;
  int dir;
} CRT_ScrollHint;

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


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

static inline int
crt_pos_cmp (CRT_Pos a, CRT_Pos b)
{
  return memcmp (&a, &b, sizeof (a));
}

#endif /* __CRT_H__ */