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 static int *bitmaps[];
45 #define GCFx(x) ((x + WORLD_X) % WORLD_X)
46 #define GCFy(y) ((y + WORLD_Y) % WORLD_Y)
49 emp_getbit(int x, int y, u_char *bitmap)
53 id = (GCFy(y)) * WORLD_X / 2 + GCFx(x) / 2;
54 return bitmap[id / 8] & bit(id & 07);
58 emp_setbit(int x, int y, u_char *bitmap)
62 id = (GCFy(y)) * WORLD_X / 2 + GCFx(x) / 2;
63 bitmap[id / 8] |= bit(id & 07);
67 emp_setbitmap(register int x, register int y, register u_char *bitmap,
74 for (mp = bitmaps; *mp != 9999;) {
77 id = (GCFy(dy)) * WORLD_X / 2 + GCFx(dx) / 2;
78 bitmap[id / 8] |= bit(id & 07);
83 bitinit2(struct nstr_sect *np, u_char *bitmap, int country)
88 while (nxtsct(np, §)) {
89 if (sect.sct_own != country)
91 eff = sect.sct_effic / 20;
94 emp_setbitmap(np->x, np->y, bitmap, bitmaps[eff]);
102 * the bit offsets for each bit pattern based on the efficiency of
112 #define bitoff(x, y) x, y
114 static int bitmap0[] = {
115 bitoff(-1, -1), bitoff(1, -1),
116 bitoff(-2, 0), bitoff(0, 0), bitoff(2, 0),
117 bitoff(-1, 1), bitoff(1, 1),
121 static int bitmap1[] = {
123 bitoff(-3, -1), bitoff(-1, -1), bitoff(1, -1), bitoff(3, -1),
124 bitoff(-2, 0), bitoff(0, 0), bitoff(2, 0),
125 bitoff(-3, 1), bitoff(-1, 1), bitoff(1, 1), bitoff(3, 1),
130 static int bitmap2[] = {
131 bitoff(-2, -2), bitoff(0, -2), bitoff(2, -2),
132 bitoff(-3, -1), bitoff(-1, -1), bitoff(1, -1), bitoff(3, -1),
133 bitoff(-4, 0), bitoff(-2, 0), bitoff(0, 0), bitoff(2, 0), bitoff(4, 0),
134 bitoff(-3, 1), bitoff(-1, 1), bitoff(1, 1), bitoff(3, 1),
135 bitoff(-2, 2), bitoff(0, 2), bitoff(2, 2),
139 static int bitmap3[] = {
140 bitoff(-1, -3), bitoff(1, -3),
141 bitoff(-4, -2), bitoff(-2, -2), bitoff(0, -2), bitoff(2, -2), bitoff(4,
143 bitoff(-5, -1), bitoff(-3, -1), bitoff(-1, -1), bitoff(1, -1),
144 bitoff(3, -1), bitoff(5, -1),
145 bitoff(-4, 0), bitoff(-2, 0), bitoff(0, 0), bitoff(2, 0), bitoff(4, 0),
146 bitoff(-5, 1), bitoff(-3, 1), bitoff(-1, 1), bitoff(1, 1),
147 bitoff(3, 1), bitoff(5, 1),
148 bitoff(-4, 2), bitoff(-2, 2), bitoff(0, 2), bitoff(2, 2), bitoff(4, 2),
149 bitoff(-1, 3), bitoff(1, 3),
153 static int bitmap4[] = {
154 bitoff(-3, -3), bitoff(-1, -3), bitoff(1, -3), bitoff(3, -3),
155 bitoff(-4, -2), bitoff(-2, -2), bitoff(0, -2), bitoff(2, -2), bitoff(4,
157 bitoff(-5, -1), bitoff(-3, -1), bitoff(-1, -1), bitoff(1, -1),
158 bitoff(3, -1), bitoff(5, -1),
159 bitoff(-6, 0), bitoff(-4, 0), bitoff(-2, 0), bitoff(0, 0), bitoff(2,
161 bitoff(4, 0), bitoff(6, 0),
162 bitoff(-5, 1), bitoff(-3, 1), bitoff(-1, 1), bitoff(1, 1),
163 bitoff(3, 1), bitoff(5, 1),
164 bitoff(-4, 2), bitoff(-2, 2), bitoff(0, 2), bitoff(2, 2), bitoff(4, 2),
165 bitoff(-3, 3), bitoff(-1, 3), bitoff(1, 3), bitoff(3, 3),
169 static int *bitmaps[5] = {