2 * Empire - A multi-player, client/server Internet based war game.
3 * Copyright (C) 1986-2006, 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 files README, COPYING and CREDITS in the root of the source
23 * tree for related information and legal notices. It is expected
24 * that future projects/authors will amend these files as needed.
28 * getbit.c: Replaces old bitmap code
30 * Known contributors to this file:
42 #include "prototypes.h"
49 * the bit offsets for each bit pattern based on the efficiency of
59 #define bitoff(x, y) x, y
61 static int bitmap0[] = {
62 bitoff(-1, -1), bitoff(1, -1),
63 bitoff(-2, 0), bitoff(0, 0), bitoff(2, 0),
64 bitoff(-1, 1), bitoff(1, 1),
68 static int bitmap1[] = {
70 bitoff(-3, -1), bitoff(-1, -1), bitoff(1, -1), bitoff(3, -1),
71 bitoff(-2, 0), bitoff(0, 0), bitoff(2, 0),
72 bitoff(-3, 1), bitoff(-1, 1), bitoff(1, 1), bitoff(3, 1),
77 static int bitmap2[] = {
78 bitoff(-2, -2), bitoff(0, -2), bitoff(2, -2),
79 bitoff(-3, -1), bitoff(-1, -1), bitoff(1, -1), bitoff(3, -1),
80 bitoff(-4, 0), bitoff(-2, 0), bitoff(0, 0), bitoff(2, 0), bitoff(4, 0),
81 bitoff(-3, 1), bitoff(-1, 1), bitoff(1, 1), bitoff(3, 1),
82 bitoff(-2, 2), bitoff(0, 2), bitoff(2, 2),
86 static int bitmap3[] = {
87 bitoff(-1, -3), bitoff(1, -3),
88 bitoff(-4, -2), bitoff(-2, -2), bitoff(0, -2), bitoff(2, -2), bitoff(4,
90 bitoff(-5, -1), bitoff(-3, -1), bitoff(-1, -1), bitoff(1, -1),
91 bitoff(3, -1), bitoff(5, -1),
92 bitoff(-4, 0), bitoff(-2, 0), bitoff(0, 0), bitoff(2, 0), bitoff(4, 0),
93 bitoff(-5, 1), bitoff(-3, 1), bitoff(-1, 1), bitoff(1, 1),
94 bitoff(3, 1), bitoff(5, 1),
95 bitoff(-4, 2), bitoff(-2, 2), bitoff(0, 2), bitoff(2, 2), bitoff(4, 2),
96 bitoff(-1, 3), bitoff(1, 3),
100 static int bitmap4[] = {
101 bitoff(-3, -3), bitoff(-1, -3), bitoff(1, -3), bitoff(3, -3),
102 bitoff(-4, -2), bitoff(-2, -2), bitoff(0, -2), bitoff(2, -2), bitoff(4,
104 bitoff(-5, -1), bitoff(-3, -1), bitoff(-1, -1), bitoff(1, -1),
105 bitoff(3, -1), bitoff(5, -1),
106 bitoff(-6, 0), bitoff(-4, 0), bitoff(-2, 0), bitoff(0, 0), bitoff(2,
108 bitoff(4, 0), bitoff(6, 0),
109 bitoff(-5, 1), bitoff(-3, 1), bitoff(-1, 1), bitoff(1, 1),
110 bitoff(3, 1), bitoff(5, 1),
111 bitoff(-4, 2), bitoff(-2, 2), bitoff(0, 2), bitoff(2, 2), bitoff(4, 2),
112 bitoff(-3, 3), bitoff(-1, 3), bitoff(1, 3), bitoff(3, 3),
116 static int *bitmaps[5] = {
124 #define GCFx(x) ((x + WORLD_X) % WORLD_X)
125 #define GCFy(y) ((y + WORLD_Y) % WORLD_Y)
128 emp_getbit(int x, int y, u_char *bitmap)
132 id = (GCFy(y)) * WORLD_X / 2 + GCFx(x) / 2;
133 return bitmap[id / 8] & bit(id & 07);
137 emp_setbit(int x, int y, u_char *bitmap)
141 id = (GCFy(y)) * WORLD_X / 2 + GCFx(x) / 2;
142 bitmap[id / 8] |= bit(id & 07);
146 emp_setbitmap(register int x, register int y, register u_char *bitmap,
153 for (mp = bitmaps; *mp != 9999;) {
156 id = (GCFy(dy)) * WORLD_X / 2 + GCFx(dx) / 2;
157 bitmap[id / 8] |= bit(id & 07);
162 bitinit2(struct nstr_sect *np, u_char *bitmap, int country)
167 while (nxtsct(np, §)) {
168 if (sect.sct_own != country)
170 eff = sect.sct_effic / 20;
173 emp_setbitmap(np->x, np->y, bitmap, bitmaps[eff]);