-
Notifications
You must be signed in to change notification settings - Fork 0
/
makebitmap.c
302 lines (288 loc) · 8.09 KB
/
makebitmap.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
//
// converts an 8x16 .BDF file into a font.bin file that my
// VGA tile driver can use
// Tweak as necessary for other font sizes
//
// virtually no sanity check or error checking is done :(
//
// Written by Eric R. Smith and placed in the public domain
//
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#define MAXUNICODE 65536
#define MAXGLYPH 256
#define MAX_LINE 32
// maps unicode code points to glyphs
short mapping_table[MAXUNICODE];
//
// set up a mapping table between Unicode and our font glyphs
// we can read this from file "mapf", which is a text file
// each line looks like:
// GG: XXXX, YYYY, AAAA-BBBB, ZZZZ
// this says that starting at glyph GG we will map
// XXXX -> GG
// YYYY -> GG+1
// AAAA -> GG+2, AAAA+1->GG+3, ... BBBB->GG+(BBBB-AAAA)+n
// and so on, incrementing
// All numbers are in hex
// the default mapping table is just the identity
void
InitMapping(FILE *mapf)
{
int i;
unsigned int AAAA, BBBB;
unsigned int GG;
int line = 1;
char buf[800];
char *p;
for (i = 0; i < MAXUNICODE; i++) {
mapping_table[i] = -1; // no mapping
}
if (!mapf) {
for (i = 0; i < MAXGLYPH; i++) {
mapping_table[i] = i;
}
return;
}
GG = AAAA = BBBB = 0;
for(;;) {
p = fgets(buf, sizeof(buf)-1, mapf);
if (!p) break;
while (*p && isspace(*p)) p++;
// allow empty lines and comments
if (*p == '#' || !*p || *p == '\n') {
line++;
continue;
}
// start with the base glyph number
GG = strtoul(p, &p, 16);
if (!p) {
fprintf(stderr, "parse error line %d\n", line);
break;
}
if (*p != ':') {
fprintf(stderr, "parse error line %d\n", line);
break;
}
p++;
while (*p && *p != '\n') {
while (*p && isspace(*p)) {
p++;
}
if (!*p || *p == '\n') break;
if (!isxdigit(*p)) {
fprintf(stderr, "expected hex digit line %d\n", line);
return;
}
AAAA = strtoul(p, &p, 16);
while (*p && isspace(*p)) p++;
if (!*p) {
continue;
}
if (*p == ',') {
// single item
BBBB = AAAA;
} else if (*p == '-') {
p++;
if (!isxdigit(*p)) {
fprintf(stderr, "expected hex digit after - on line %d\n", line);
return;
}
BBBB = strtoul(p, &p, 16);
} else {
fprintf(stderr, "unexpected character `%c' on line %d\n", *p, line);
return;
}
while (AAAA <= BBBB) {
mapping_table[AAAA] = GG;
GG++;
AAAA++;
}
if (*p == ',') p++;
while (*p && isspace(*p)) p++;
}
line++;
}
}
int FONT_HEIGHT = 0;
int FONT_WIDTH = 8;
unsigned short fontdata[MAXGLYPH][MAX_LINE];
#define LINELEN 256
char buf[LINELEN];
char * ProcessChar(unsigned glyphnum, unsigned codepoint, FILE *in)
{
int bitmapline = -1;
char *p;
int w, h, x, y;
for(;;) {
p = fgets(buf, LINELEN-1, in);
if (!p) {
return p;
}
if (!strncmp(p, "BBX ", 4)) {
sscanf(p+4, "%d %d %d %d", &w, &h, &x, &y);
if (w > FONT_WIDTH) {
fprintf(stderr, "bounding box too wide for U+%04x\n", codepoint);
exit(1);
}
if (h > FONT_HEIGHT) {
fprintf(stderr, "bounding box too tall for U+%04x\n", codepoint);
exit(1);
}
}
if (!strncmp(p, "ENDCHAR", 6)) {
return p;
}
if (!strncmp(p, "BITMAP", 6)) {
bitmapline = 0;
continue;
}
if (bitmapline >= 0) {
if (bitmapline >= FONT_HEIGHT) {
fprintf(stderr, "too many lines in character\n");
return p;
}
fontdata[glyphnum][bitmapline] = strtoul(p, NULL, 16);
bitmapline++;
}
}
}
void Process(FILE *in, FILE *out)
{
char *p;
unsigned codepoint;
unsigned glyph;
int i, j, k;
int width, height;
for(;;) {
p = fgets(buf, LINELEN-1, in);
if (!p) break;
if (!strncmp(p, "FONTBOUNDINGBOX ", strlen("FONTBOUNDINGBOX "))) {
width = height = 0;
p += strlen("FONTBOUNDINGBOX ");
width = strtoul(p, &p, 0);
(void)width;
if (p) {
height = strtoul(p, &p, 0);
}
if (height == 0) {
fprintf(stderr, "WARNING: unable to find font height\n");
} else {
FONT_HEIGHT = height;
}
continue;
}
if (0 != strncmp(p, "STARTCHAR ", strlen("STARTCHAR "))) {
continue;
}
if (0 == strncmp(p, "STARTCHAR U+", strlen("STARTCHAR U+"))) {
p += strlen("STARTCHAR U+");
codepoint = strtoul(p, NULL, 16);
} else {
// look for ENCODING line following
p = fgets(buf, LINELEN-1, in);
if (!p || 0 != strncmp(p, "ENCODING ", strlen("ENCODING "))) {
fprintf(stderr, "ERROR: unable to find ENCODING");
exit(2);
}
p += strlen("ENCODING ");
codepoint = strtoul(p, NULL, 0);
}
// fprintf(stderr, "process code point %x [%s]\n", codepoint, p);
glyph = mapping_table[codepoint];
if (glyph >= 0 && glyph < MAXGLYPH) {
p = ProcessChar(glyph, codepoint, in);
if (!p) break;
}
}
#ifdef DEBUG
// debug code
printf("bitmap data:\n");
for (j = 0; j < FONT_HEIGHT; j++) {
// for (i = 0; i < MAXGLYPH; i++) {
for (i = 'c'; i < 'k'; i++) {
unsigned c = fontdata[i][j];
for (k = FONT_WIDTH-1; k >= 0; --k) {
int h = '.';
if (c & (1<<k)) {
h = '*';
}
fputc(h, stdout);
}
fputc(' ', stdout);
}
fprintf(stdout, "\n");
}
#endif
for (j = 0; j < FONT_HEIGHT; j++) {
for (i = 0; i < MAXGLYPH; i++) {
unsigned c = fontdata[i][j];
unsigned r = 0;
unsigned mask = 1 << FONT_WIDTH-1;
// get bits in little endian order
for (k = 0; k < FONT_WIDTH; k++) {
if (c & (1<<k)) {
r = r | mask;
}
mask = mask >> 1;
}
if (FONT_WIDTH == 16) {
fputc( r & 0xff, out );
fputc( (r>>8) & 0xff, out);
} else {
fputc(r, out);
}
}
}
}
int main(int argc, char **argv)
{
FILE *inf, *outf, *maptab;
char *inname;
char *outname;
int len;
if (argc > 2 && !strcmp(argv[1], "-16")) {
FONT_WIDTH = 16;
--argc; ++argv;
}
if (argc != 2 && argc != 3) {
fprintf(stderr, "Usage: makebitmap [-16] font.bdf [map table]\n");
exit(2);
}
inname = argv[1];
// if the file is named foo-16xN then it is 16 wide
if (strstr(inname, "-16x")) {
FONT_WIDTH = 16;
}
inf = fopen(inname, "r"); // .bdf is a text format
if (!inf) {
perror(inname);
exit(1);
}
maptab = NULL;
if (argv[2]) {
maptab = fopen(argv[2], "r");
if (!maptab) {
perror(argv[2]);
}
}
InitMapping(maptab);
len = strlen(inname);
// make sure there is room for at least "font.bin"
outname = malloc(len + 16);
strcpy(outname, inname);
if (len > 4 && !strcmp(outname+len-4, ".bdf")) {
strcpy(outname+len-4, ".bin");
} else {
strcpy(outname, "font.bin");
}
outf = fopen(outname, "wb");
if (!outf) {
perror(outname);
return 1;
}
Process(inf, outf);
return 0;
}