4 * Copyright (c) 2008 James McKenzie <james@fishsoup.dhs.org>,
9 static char rcsid[] = "$Id: crt.c,v 1.18 2008/03/07 12:37:04 james Exp $";
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72 crt_erase (CRT * c, CRT_Pos s, CRT_Pos e, int ea, int color)
74 CRT_CA *ps = &c->screen[CRT_ADDR_POS (&s)];
75 CRT_CA *pe = &c->screen[CRT_ADDR_POS (&e)];
80 ps->attr = CRT_ATTR_NORMAL;
92 CRT_Pos e = { CRT_COLS - 1, CRT_ROWS - 1 };
95 crt_erase (c, s, e, 1, CRT_COLOR_NORMAL);
102 crt_scroll_up (CRT * c, CRT_Pos s, CRT_Pos e, int ea, int color)
119 l *= sizeof (CRT_CA);
124 p = CRT_ADDR_POS (&s);
127 memcpy (&c->screen[p], &c->screen[p + CRT_COLS], l);
132 crt_erase (c, s, e, ea, color);
137 crt_scroll_down (CRT * c, CRT_Pos s, CRT_Pos e, int ea, int color)
153 l *= sizeof (CRT_CA);
158 p = CRT_ADDR_POS (&e);
162 memcpy (&c->screen[p], &c->screen[p - CRT_COLS], l);
166 crt_erase (c, s, e, ea, color);
178 c->size.x = CRT_COLS;
179 c->size.y = CRT_ROWS;
186 crt_insert (CRT * c, CRT_CA ca)
190 if (c->pos.x >= CRT_COLS)
191 c->pos.x = CRT_COLS - 1;
194 if (c->pos.y >= CRT_ROWS)
195 c->pos.y = CRT_ROWS - 1;
197 c->screen[CRT_ADDR (c->pos.y, c->pos.x)] = ca;