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/*
* crt.c:
*
* Copyright (c) 2008 James McKenzie <james@fishsoup.dhs.org>,
* All rights reserved.
*
*/
static char rcsid[] = "$Id$";
/*
* $Log$
* Revision 1.3 2008/02/04 20:23:55 james
* *** empty log message ***
*
* Revision 1.2 2008/02/04 02:05:06 james
* *** empty log message ***
*
* Revision 1.1 2008/02/03 23:31:25 james
* *** empty log message ***
*
*/
#include "project.h"
void
crt_erase (CRT * c, CRT_Pos s, CRT_Pos e,int ea)
{
CRT_CA *ps = &c->screen[CRT_ADDR_POS (&s)];
CRT_CA *pe = &c->screen[CRT_ADDR_POS (&e)];
while (ps <= pe)
{
ps->chr = ' ';
if (ea)
ps->attr = CRT_ATTR_NORMAL;
ps++;
}
}
void
crt_cls (CRT * c)
{
CRT_Pos s = { 0, 0 };
CRT_Pos e = { CRT_COLS - 1, CRT_ROWS - 1 };
int i;
crt_erase (c, s, e,1);
#if 0
for (i = 0; i < CRT_ROWS; ++i)
{
c->screen[CRT_ADDR (i, i)].chr = '@' + i;
c->screen[CRT_ADDR (i, i)].attr = CRT_ATTR_NORMAL;
}
#endif
}
void
crt_scroll_up (CRT * c, CRT_Pos s, CRT_Pos e,int ea)
{
int l, n;
int p;
s.x=0;
e.x=CRT_COLS-1;
l = e.x - s.x;
l++;
l *= sizeof (CRT_CA);
n = e.y - s.y;
p = CRT_ADDR_POS (&s);
while (n--)
{
memcpy (&c->screen[p], &c->screen[p + CRT_COLS], l);
p += CRT_COLS;
}
s.y = e.y;
crt_erase (c, s, e,ea);
}
void
crt_scroll_down (CRT * c, CRT_Pos s, CRT_Pos e,int ea)
{
int l, n;
int p;
s.x=0;
e.x=CRT_COLS-1;
l = e.x - s.x;
l++;
l *= sizeof (CRT_CA);
n = e.y - s.y;
p = CRT_ADDR_POS (&e);
while (n--)
{
memcpy (&c->screen[p], &c->screen[p + CRT_COLS], l);
p -= CRT_COLS;
}
e.y = s.y;
crt_erase (c, s, e,ea);
}
void
crt_reset (CRT * c)
{
crt_cls (c);
c->pos.x = 0;
c->pos.y = 0;
c->hide_cursor = 1;
}
void
crt_insert (CRT * c, CRT_CA ca)
{
if (c->pos.x < 0)
c->pos.x = 0;
if (c->pos.x >= CRT_COLS)
c->pos.x = CRT_COLS - 1;
if (c->pos.y < 0)
c->pos.y = 0;
if (c->pos.y >= CRT_ROWS)
c->pos.y = CRT_ROWS - 1;
c->screen[CRT_ADDR (c->pos.y, c->pos.x)] = ca;
}
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