4 * Copyright (c) 2008 James McKenzie <james@fishsoup.dhs.org>,
9 static char rcsid[] = "$Id$";
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60 crt_erase (CRT * c, CRT_Pos s, CRT_Pos e, int ea, int color)
62 CRT_CA *ps = &c->screen[CRT_ADDR_POS (&s)];
63 CRT_CA *pe = &c->screen[CRT_ADDR_POS (&e)];
70 ps->attr = CRT_ATTR_NORMAL;
82 CRT_Pos e = { CRT_COLS - 1, CRT_ROWS - 1 };
85 crt_erase (c, s, e, 1, CRT_COLOR_NORMAL);
92 crt_scroll_up (CRT * c, CRT_Pos s, CRT_Pos e, int ea, int color)
109 l *= sizeof (CRT_CA);
114 p = CRT_ADDR_POS (&s);
118 memcpy (&c->screen[p], &c->screen[p + CRT_COLS], l);
123 crt_erase (c, s, e, ea, color);
128 crt_scroll_down (CRT * c, CRT_Pos s, CRT_Pos e, int ea, int color)
144 l *= sizeof (CRT_CA);
149 p = CRT_ADDR_POS (&e);
154 memcpy (&c->screen[p], &c->screen[p - CRT_COLS], l);
158 crt_erase (c, s, e, ea, color);
177 crt_insert (CRT * c, CRT_CA ca)
181 if (c->pos.x >= CRT_COLS)
182 c->pos.x = CRT_COLS - 1;
185 if (c->pos.y >= CRT_ROWS)
186 c->pos.y = CRT_ROWS - 1;
188 c->screen[CRT_ADDR (c->pos.y, c->pos.x)] = ca;