2 * Empire - A multi-player, client/server Internet based war game.
3 * Copyright (C) 1986-2000, Dave Pare, Jeff Bailey, Thomas Ruschak,
4 * Ken Stevens, Steve McClure
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 * See the "LEGAL", "LICENSE", "CREDITS" and "README" files for all the
23 * related information and legal notices. It is expected that any future
24 * projects/authors will amend these files as needed.
28 * getbit.c: Replaces old bitmap code
30 * Known contributors to this file:
40 #include "prototypes.h"
43 #define GCFx(x) ((x + WORLD_X) % WORLD_X)
44 #define GCFy(y) ((y + WORLD_Y) % WORLD_Y)
47 emp_getbit(int x, int y, u_char *bitmap)
51 id = (GCFy(y)) * WORLD_X / 2 + GCFx(x) / 2;
52 return bitmap[id / 8] & bit(id & 07);
56 emp_setbit(int x, int y, u_char *bitmap)
60 id = (GCFy(y)) * WORLD_X / 2 + GCFx(x) / 2;
61 bitmap[id / 8] |= bit(id & 07);
65 emp_setbitmap(register int x, register int y, register u_char *bitmap,
72 for (mp = bitmaps; *mp != 9999;) {
75 id = (GCFy(dy)) * WORLD_X / 2 + GCFx(dx) / 2;
76 bitmap[id / 8] |= bit(id & 07);
83 * the bit offsets for each bit pattern based on the efficiency of
93 #define bitoff(x, y) x, y
96 bitoff(-1, -1), bitoff(1, -1),
97 bitoff(-2, 0), bitoff(0, 0), bitoff(2, 0),
98 bitoff(-1, 1), bitoff(1, 1),
104 bitoff(-3, -1), bitoff(-1, -1), bitoff(1, -1), bitoff(3, -1),
105 bitoff(-2, 0), bitoff(0, 0), bitoff(2, 0),
106 bitoff(-3, 1), bitoff(-1, 1), bitoff(1, 1), bitoff(3, 1),
112 bitoff(-2, -2), bitoff(0, -2), bitoff(2, -2),
113 bitoff(-3, -1), bitoff(-1, -1), bitoff(1, -1), bitoff(3, -1),
114 bitoff(-4, 0), bitoff(-2, 0), bitoff(0, 0), bitoff(2, 0), bitoff(4, 0),
115 bitoff(-3, 1), bitoff(-1, 1), bitoff(1, 1), bitoff(3, 1),
116 bitoff(-2, 2), bitoff(0, 2), bitoff(2, 2),
121 bitoff(-1, -3), bitoff(1, -3),
122 bitoff(-4, -2), bitoff(-2, -2), bitoff(0, -2), bitoff(2, -2), bitoff(4,
124 bitoff(-5, -1), bitoff(-3, -1), bitoff(-1, -1), bitoff(1, -1),
125 bitoff(3, -1), bitoff(5, -1),
126 bitoff(-4, 0), bitoff(-2, 0), bitoff(0, 0), bitoff(2, 0), bitoff(4, 0),
127 bitoff(-5, 1), bitoff(-3, 1), bitoff(-1, 1), bitoff(1, 1),
128 bitoff(3, 1), bitoff(5, 1),
129 bitoff(-4, 2), bitoff(-2, 2), bitoff(0, 2), bitoff(2, 2), bitoff(4, 2),
130 bitoff(-1, 3), bitoff(1, 3),
135 bitoff(-3, -3), bitoff(-1, -3), bitoff(1, -3), bitoff(3, -3),
136 bitoff(-4, -2), bitoff(-2, -2), bitoff(0, -2), bitoff(2, -2), bitoff(4,
138 bitoff(-5, -1), bitoff(-3, -1), bitoff(-1, -1), bitoff(1, -1),
139 bitoff(3, -1), bitoff(5, -1),
140 bitoff(-6, 0), bitoff(-4, 0), bitoff(-2, 0), bitoff(0, 0), bitoff(2,
142 bitoff(4, 0), bitoff(6, 0),
143 bitoff(-5, 1), bitoff(-3, 1), bitoff(-1, 1), bitoff(1, 1),
144 bitoff(3, 1), bitoff(5, 1),
145 bitoff(-4, 2), bitoff(-2, 2), bitoff(0, 2), bitoff(2, 2), bitoff(4, 2),
146 bitoff(-3, 3), bitoff(-1, 3), bitoff(1, 3), bitoff(3, 3),