2 * Empire - A multi-player, client/server Internet based war game.
3 * Copyright (C) 1986-2004, 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"
47 * the bit offsets for each bit pattern based on the efficiency of
57 #define bitoff(x, y) x, y
59 static int bitmap0[] = {
60 bitoff(-1, -1), bitoff(1, -1),
61 bitoff(-2, 0), bitoff(0, 0), bitoff(2, 0),
62 bitoff(-1, 1), bitoff(1, 1),
66 static int bitmap1[] = {
68 bitoff(-3, -1), bitoff(-1, -1), bitoff(1, -1), bitoff(3, -1),
69 bitoff(-2, 0), bitoff(0, 0), bitoff(2, 0),
70 bitoff(-3, 1), bitoff(-1, 1), bitoff(1, 1), bitoff(3, 1),
75 static int bitmap2[] = {
76 bitoff(-2, -2), bitoff(0, -2), bitoff(2, -2),
77 bitoff(-3, -1), bitoff(-1, -1), bitoff(1, -1), bitoff(3, -1),
78 bitoff(-4, 0), bitoff(-2, 0), bitoff(0, 0), bitoff(2, 0), bitoff(4, 0),
79 bitoff(-3, 1), bitoff(-1, 1), bitoff(1, 1), bitoff(3, 1),
80 bitoff(-2, 2), bitoff(0, 2), bitoff(2, 2),
84 static int bitmap3[] = {
85 bitoff(-1, -3), bitoff(1, -3),
86 bitoff(-4, -2), bitoff(-2, -2), bitoff(0, -2), bitoff(2, -2), bitoff(4,
88 bitoff(-5, -1), bitoff(-3, -1), bitoff(-1, -1), bitoff(1, -1),
89 bitoff(3, -1), bitoff(5, -1),
90 bitoff(-4, 0), bitoff(-2, 0), bitoff(0, 0), bitoff(2, 0), bitoff(4, 0),
91 bitoff(-5, 1), bitoff(-3, 1), bitoff(-1, 1), bitoff(1, 1),
92 bitoff(3, 1), bitoff(5, 1),
93 bitoff(-4, 2), bitoff(-2, 2), bitoff(0, 2), bitoff(2, 2), bitoff(4, 2),
94 bitoff(-1, 3), bitoff(1, 3),
98 static int bitmap4[] = {
99 bitoff(-3, -3), bitoff(-1, -3), bitoff(1, -3), bitoff(3, -3),
100 bitoff(-4, -2), bitoff(-2, -2), bitoff(0, -2), bitoff(2, -2), bitoff(4,
102 bitoff(-5, -1), bitoff(-3, -1), bitoff(-1, -1), bitoff(1, -1),
103 bitoff(3, -1), bitoff(5, -1),
104 bitoff(-6, 0), bitoff(-4, 0), bitoff(-2, 0), bitoff(0, 0), bitoff(2,
106 bitoff(4, 0), bitoff(6, 0),
107 bitoff(-5, 1), bitoff(-3, 1), bitoff(-1, 1), bitoff(1, 1),
108 bitoff(3, 1), bitoff(5, 1),
109 bitoff(-4, 2), bitoff(-2, 2), bitoff(0, 2), bitoff(2, 2), bitoff(4, 2),
110 bitoff(-3, 3), bitoff(-1, 3), bitoff(1, 3), bitoff(3, 3),
114 static int *bitmaps[5] = {
122 #define GCFx(x) ((x + WORLD_X) % WORLD_X)
123 #define GCFy(y) ((y + WORLD_Y) % WORLD_Y)
126 emp_getbit(int x, int y, u_char *bitmap)
130 id = (GCFy(y)) * WORLD_X / 2 + GCFx(x) / 2;
131 return bitmap[id / 8] & bit(id & 07);
135 emp_setbit(int x, int y, u_char *bitmap)
139 id = (GCFy(y)) * WORLD_X / 2 + GCFx(x) / 2;
140 bitmap[id / 8] |= bit(id & 07);
144 emp_setbitmap(register int x, register int y, register u_char *bitmap,
151 for (mp = bitmaps; *mp != 9999;) {
154 id = (GCFy(dy)) * WORLD_X / 2 + GCFx(dx) / 2;
155 bitmap[id / 8] |= bit(id & 07);
160 bitinit2(struct nstr_sect *np, u_char *bitmap, int country)
165 while (nxtsct(np, §)) {
166 if (sect.sct_own != country)
168 eff = sect.sct_effic / 20;
171 emp_setbitmap(np->x, np->y, bitmap, bitmaps[eff]);