1 /****************************************************************************
2 * RRDtool 1.2.23 Copyright by Tobi Oetiker, 1997-2007
3 ****************************************************************************
4 * rrd_afm.h Parsing afm tables to find width of strings.
5 ****************************************************************************
6 * $Id$
7 */
9 #if defined(_WIN32) && !defined(__CYGWIN__) && !defined(__CYGWIN32__) && !defined(HAVE_CONFIG_H)
10 #include "../win32/config.h"
11 #else
12 #ifdef HAVE_CONFIG_H
13 #include "../rrd_config.h"
14 #endif
15 #endif
17 #include "rrd_afm.h"
18 #include "rrd_afm_data.h"
20 #include <stdio.h>
22 #ifdef HAVE_STRING_H
23 #include <string.h>
24 #endif
26 #include "unused.h"
28 #if 0
29 # define DEBUG 1
30 # define DLOG(x) fprintf x
31 #else
32 # define DEBUG 0
33 # define DLOG(x)
34 #endif
36 /* Adobe SVG View and Batik 1.1.1 can't handle ligatures.
37 So disable it as we just waste speed.
38 Besides, it doesn't matter much in normal text.
39 */
40 #define ENABLE_LIGATURES 0
42 static const afm_fontinfo *afm_last_used_font = NULL;
43 static const char *last_unknown_font = NULL;
45 #define is_font(p, name) \
46 (!strcmp(p->postscript_name, name) || !strcmp(p->fullname, name))
48 static const afm_fontinfo *afm_searchfont(const char *name)
49 {
50 int i;
51 const afm_fontinfo *p = afm_last_used_font;
52 if (p && is_font(p, name))
53 return p;
54 p = afm_fontinfolist;
55 for (i = 0; i < afm_fontinfo_count; i++, p++) {
56 if (is_font(p, name)) {
57 afm_last_used_font = p;
58 return p;
59 }
60 }
61 return NULL;
62 }
65 /* returns always a font, never NULL.
66 The rest of the code depends on the result never being NULL.
67 See rrd_afm.h */
68 static const afm_fontinfo *afm_findfont(const char *name)
69 {
70 const afm_fontinfo *p = afm_searchfont(name);
71 if (p)
72 return p;
73 if (!last_unknown_font || strcmp(name, last_unknown_font)) {
74 fprintf(stderr, "Can't find font '%s'\n", name);
75 last_unknown_font = name;
76 }
77 p = afm_searchfont(RRD_AFM_DEFAULT_FONT);
78 if (p)
79 return p;
80 return afm_fontinfolist; /* anything, just anything. */
81 }
83 const char *afm_get_font_postscript_name(const char* font)
84 {
85 const afm_fontinfo *p = afm_findfont(font);
86 return p->postscript_name;
87 }
89 const char *afm_get_font_name(const char* font)
90 {
91 const afm_fontinfo *p = afm_findfont(font);
92 return p->fullname;
93 }
95 double afm_get_ascender(const char* font, double size)
96 {
97 const afm_fontinfo *p = afm_findfont(font);
98 return size * p->ascender / 1000.0;
99 }
101 double afm_get_descender(const char* font, double size)
102 {
103 const afm_fontinfo *p = afm_findfont(font);
104 return size * p->descender / 1000.0;
105 }
107 static int afm_find_char_index(const afm_fontinfo *fontinfo,
108 afm_cunicode ch1)
109 {
110 int idx = ch1 - 32;
111 afm_cuint16 *indexP;
112 int numIndexChars, i;
113 if (idx <= 0)
114 return 0;
115 if (idx <= 126 - 32)
116 return idx;
117 indexP = fontinfo->highchars_index;
118 if (indexP == 0)
119 return 0;
120 numIndexChars = fontinfo->highchars_count;
121 DLOG((stderr, " find highbit, num = %d\n", numIndexChars));
122 if (ch1 >= 161 && ch1 <= 255) {
123 idx = ch1 - 161;
124 DLOG((stderr, " 161, idx = %d -> %d\n", idx, indexP[idx]));
125 if (idx < numIndexChars && indexP[idx] == ch1) {
126 idx += 127 - 32;
127 DLOG((stderr, " 161-guessed ok to %d\n", idx));
128 return idx;
129 }
130 }
131 for (i = 0; i < numIndexChars; i++) {
132 DLOG((stderr, " compares to %d -> %d\n", indexP[i], i));
133 if (indexP[i] == ch1)
134 return i + 127 - 32;
135 }
136 DLOG((stderr, "Did not find %d in highchars_index ??\n", ch1));
137 return 0;
138 }
140 #if ENABLE_LIGATURES
141 static afm_cunicode afm_find_combined_ligature(const afm_fontinfo *fontinfo,
142 afm_cunicode ch1, afm_cunicode ch2)
143 {
144 afm_cunicode *p = fontinfo->ligatures;
145 int num = fontinfo->ligatures_count;
146 int i;
147 if (!num)
148 return 0;
149 DLOG((stderr, " find-lig, num = %d\n", num));
150 for (i = 0; i < num; i++, p += 3) {
151 DLOG((stderr, " lig: %d + %d -> %d (%c %c %c)\n",
152 p[0], p[1], p[2], p[0], p[1], p[2]));
153 if (ch1 == *p && ch2 == p[1]) {
154 DLOG((stderr, " matches.\n"));
155 return p[2];
156 }
157 }
158 return 0;
159 }
160 #endif
162 #define READ_ESCAPED(p, val) \
163 if ((val = *p++) == 0) { \
164 val = 254 + *p++; \
165 } else if (!--val) { \
166 val = *p++ << 8; \
167 val |= *p++; \
168 }
171 static long afm_find_kern(const afm_fontinfo *fontinfo,
172 int kern_idx, afm_cunicode ch2)
173 {
174 afm_cuint8 *p8 = fontinfo->kerning_data + kern_idx;
175 int num;
176 READ_ESCAPED(p8, num);
177 DLOG((stderr, " find kern, num pairs = %d\n", num));
178 while (num > 0) {
179 afm_unicode ch;
180 READ_ESCAPED(p8, ch);
181 DLOG((stderr, " pair-char = %d\n", ch));
182 if (ch == ch2) {
183 DLOG((stderr, " got kern = %d\n", *(afm_csint8*)p8));
184 return *(afm_csint8*)p8;
185 }
186 p8++;
187 num--;
188 }
189 return 0;
190 }
192 /* measure width of a text string */
193 double afm_get_text_width( double start, const char* font, double size,
194 double tabwidth, const char* text)
195 {
196 #ifdef HAVE_MBSTOWCS
197 size_t clen = strlen(text) + 1;
198 wchar_t *cstr = malloc(sizeof(wchar_t) * clen); /* yes we are allocating probably too much here, I know */
199 int text_count = mbstowcs(cstr, text, clen);
200 double w;
201 if (text_count == -1)
202 text_count = mbstowcs(cstr, "Enc-Err", 6);
203 #ifdef __APPLE__
204 while (text_count > 0) {
205 text_count--;
206 cstr[text_count] = afm_fix_osx_charset(cstr[text_count]); /* unsafe macro */
207 }
208 #endif
209 w = afm_get_text_width_wide(start, font, size, tabwidth, cstr);
210 free(cstr);
211 return w;
212 #else
213 return afm_get_text_width_wide(start, font, size, tabwidth, text);
214 #endif
215 }
217 double afm_get_text_width_wide( double UNUSED(start), const char* font, double size,
218 double UNUSED(tabwidth), const afm_char* text)
219 {
220 const afm_fontinfo *fontinfo = afm_findfont(font);
221 long width = 0;
222 double widthf;
223 const afm_char *up = text;
224 DLOG((stderr, "================= %s\n", text));
225 if (fontinfo == NULL) {
226 while (*up)
227 up++;
228 return size * (up - text);
229 }
230 while (1) {
231 afm_unicode ch1, ch2;
232 int idx1, kern_idx;
233 if ((ch1 = *up) == 0)
234 break;
235 ch2 = *++up;
236 DLOG((stderr, "------------- Loop: %d + %d (%c%c) at %d\n",
237 ch1, ch2, ch1, ch2 ? ch2 : ' ',
238 (up - (const unsigned char*)text) - 1));
239 idx1 = afm_find_char_index(fontinfo, ch1);
240 DLOG((stderr, " idx1 = %d\n", idx1));
241 #if ENABLE_LIGATURES
242 if (ch2) {
243 int ch1_new = afm_find_combined_ligature(fontinfo, ch1, ch2);
244 DLOG((stderr, " lig-ch = %d\n", ch1_new));
245 if (ch1_new) {
246 ch1 = ch1_new;
247 idx1 = afm_find_char_index(fontinfo, ch1);
248 ch2 = *++up;
249 DLOG((stderr, " -> idx1 = %d, ch2 = %d (%c)\n",
250 idx1, ch2, ch2 ? ch2 : ' '));
251 }
252 }
253 #endif
254 width += fontinfo->widths[idx1];
255 DLOG((stderr, "Plain width of %d = %d\n", ch1, fontinfo->widths[idx1]));
256 if (fontinfo->kerning_index && ch2) {
257 kern_idx = fontinfo->kerning_index[idx1];
258 DLOG((stderr, " kern_idx = %d\n", kern_idx));
259 if (kern_idx > 0)
260 width += afm_find_kern(fontinfo, kern_idx, ch2);
261 }
262 }
263 widthf = (width * 6 / 1000.0) * size;
264 DLOG((stderr, "Returns %ld (%ld) -> %f\n", width, width * 6, widthf));
265 return widthf;
266 }
268 #ifdef __APPLE__
269 const unsigned char afm_mac2iso[128] = {
270 '\xC4', '\xC5', '\xC7', '\xC9', '\xD1', '\xD6', '\xDC', '\xE1', /* 80 */
271 '\xE0', '\xE2', '\xE4', '\xE3', '\xE5', '\xE7', '\xE9', '\xE8', /* 88 */
272 '\xEA', '\xEB', '\xED', '\xEC', '\xEE', '\xEF', '\xF1', '\xF3', /* 90 */
273 '\xF2', '\xF4', '\xF6', '\xF5', '\xFA', '\xF9', '\xFB', '\xFC', /* 98 */
274 '\xDD', '\xB0', '\xA2', '\xA3', '\xA7', ' ', '\xB6', '\xDF', /* A0 */
275 '\xAE', '\xA9', ' ', '\xB4', '\xA8', ' ', '\xC6', '\xD8', /* A8 */
276 ' ', '\xB1', '\xBE', ' ', '\xA5', '\xB5', ' ', ' ', /* B0 */
277 '\xBD', '\xBC', ' ', '\xAA', '\xBA', ' ', '\xE6', '\xF8', /* B8 */
278 '\xBF', '\xA1', '\xAC', ' ', ' ', ' ', ' ', '\xAB', /* C0 */
279 '\xBB', ' ', '\xA0', '\xC0', '\xC3', '\xD5', ' ', '\xA6', /* C8 */
280 '\xAD', ' ', '"', '"', '\'', '\'', '\xF7', '\xD7', /* D0 */
281 '\xFF', ' ', ' ', '\xA4', '\xD0', '\xF0', '\xDE', '\xFE', /* D8 */
282 '\xFD', '\xB7', ' ', ' ', ' ', '\xC2', '\xCA', '\xC1', /* E0 */
283 '\xCB', '\xC8', '\xCD', '\xCE', '\xCF', '\xCC', '\xD3', '\xD4', /* E8 */
284 ' ', '\xD2', '\xDA', '\xDB', '\xD9', ' ', ' ', ' ', /* F0 */
285 '\xAF', ' ', ' ', ' ', '\xB8', ' ', ' ', ' ', /* F8 */
286 };
287 #endif