4 * Copyright (c) 2008 James McKenzie <james@fishsoup.dhs.org>,
9 static char rcsid[] = "$Id$";
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63 crt_erase (CRT * c, CRT_Pos s, CRT_Pos e, int ea, int color)
65 CRT_CA *ps = &c->screen[CRT_ADDR_POS (&s)];
66 CRT_CA *pe = &c->screen[CRT_ADDR_POS (&e)];
73 ps->attr = CRT_ATTR_NORMAL;
85 CRT_Pos e = { CRT_COLS - 1, CRT_ROWS - 1 };
88 crt_erase (c, s, e, 1, CRT_COLOR_NORMAL);
95 crt_scroll_up (CRT * c, CRT_Pos s, CRT_Pos e, int ea, int color)
112 l *= sizeof (CRT_CA);
117 p = CRT_ADDR_POS (&s);
121 memcpy (&c->screen[p], &c->screen[p + CRT_COLS], l);
126 crt_erase (c, s, e, ea, color);
131 crt_scroll_down (CRT * c, CRT_Pos s, CRT_Pos e, int ea, int color)
147 l *= sizeof (CRT_CA);
152 p = CRT_ADDR_POS (&e);
157 memcpy (&c->screen[p], &c->screen[p - CRT_COLS], l);
161 crt_erase (c, s, e, ea, color);
173 c->size.x = CRT_COLS;
174 c->size.y = CRT_ROWS;
181 crt_insert (CRT * c, CRT_CA ca)
185 if (c->pos.x >= CRT_COLS)
186 c->pos.x = CRT_COLS - 1;
189 if (c->pos.y >= CRT_ROWS)
190 c->pos.y = CRT_ROWS - 1;
192 c->screen[CRT_ADDR (c->pos.y, c->pos.x)] = ca;