c9996d0b24031dd946a3816647af1820546ee283
1 /****************************************************************************
2 * RRDtool 1.1.x Copyright Tobias Oetiker, 1997 - 2002
3 ****************************************************************************
4 * rrd_afm.h Parsing afm tables to find width of strings.
5 ****************************************************************************/
7 #include "config.h"
9 #include "rrd_afm.h"
10 #include "rrd_afm_data.h"
12 #include <stdlib.h>
13 #include <stdio.h>
15 #ifdef HAVE_STRING_H
16 #include <string.h>
17 #endif
19 #if 0
20 # define DEBUG 1
21 # define DLOG(x) fprintf x
22 #else
23 # define DEBUG 0
24 # define DLOG(x)
25 #endif
27 /* Adobe SVG View and Batik 1.1.1 can't handle ligatures.
28 So disable it as we just waste speed.
29 Besides, it doesn't matter much in normal text.
30 */
31 #define ENABLE_LIGATURES 0
33 static const afm_fontinfo *afm_last_used_font;
35 #define is_font(p, name) \
36 (!strcmp(p->postscript_name, name) || !strcmp(p->fullname, name))
38 static const afm_fontinfo *afm_searchfont(const char *name)
39 {
40 int i;
41 const afm_fontinfo *p = afm_last_used_font;
42 if (p && is_font(p, name))
43 return p;
44 p = afm_fontinfolist;
45 for (i = 0; i < afm_fontinfo_count; i++, p++) {
46 if (is_font(p, name)) {
47 afm_last_used_font = p;
48 return p;
49 }
50 }
51 return NULL;
52 }
54 static const afm_fontinfo *afm_findfont(const char *name)
55 {
56 const afm_fontinfo *p = afm_searchfont(name);
57 if (p)
58 return p;
59 if (1 || DEBUG) fprintf(stderr, "Can't find font '%s'\n", name);
60 p = afm_searchfont("Helvetica");
61 if (p)
62 return p;
63 return NULL;
64 }
66 const char *afm_get_font_postscript_name(const char* font)
67 {
68 const afm_fontinfo *p = afm_findfont(font);
69 return p ? p->postscript_name : "Helvetica";
70 }
72 static int afm_find_char_index(const afm_fontinfo *fontinfo,
73 afm_cunicode ch1)
74 {
75 int idx = ch1 - 32;
76 afm_cuint16 *indexP;
77 int numIndexChars, i;
78 if (idx <= 0)
79 return 0;
80 if (idx <= 126 - 32)
81 return idx;
82 indexP = fontinfo->highchars_index;
83 if (indexP == 0)
84 return 0;
85 numIndexChars = fontinfo->highchars_count;
86 DLOG((stderr, " find highbit, num = %d\n", numIndexChars));
87 if (ch1 >= 161 && ch1 <= 255) {
88 idx = ch1 - 161;
89 DLOG((stderr, " 161, idx = %d -> %d\n", idx, indexP[idx]));
90 if (idx < numIndexChars && indexP[idx] == ch1) {
91 idx += 127 - 32;
92 DLOG((stderr, " 161-guessed ok to %d\n", idx));
93 return idx;
94 }
95 }
96 for (i = 0; i < numIndexChars; i++) {
97 DLOG((stderr, " compares to %d -> %d\n", indexP[i], i));
98 if (indexP[i] == ch1)
99 return i + 127 - 32;
100 }
101 DLOG((stderr, "Did not find %d in highchars_index ??\n", ch1));
102 return 0;
103 }
105 #if ENABLE_LIGATURES
106 static afm_cunicode afm_find_combined_ligature(const afm_fontinfo *fontinfo,
107 afm_cunicode ch1, afm_cunicode ch2)
108 {
109 afm_cunicode *p = fontinfo->ligatures;
110 int num = fontinfo->ligatures_count;
111 int i;
112 if (!num)
113 return 0;
114 DLOG((stderr, " find-lig, num = %d\n", num));
115 for (i = 0; i < num; i++, p += 3) {
116 DLOG((stderr, " lig: %d + %d -> %d (%c %c %c)\n",
117 p[0], p[1], p[2], p[0], p[1], p[2]));
118 if (ch1 == *p && ch2 == p[1]) {
119 DLOG((stderr, " matches.\n"));
120 return p[2];
121 }
122 }
123 return 0;
124 }
125 #endif
127 #define READ_ESCAPED(p, val) \
128 if ((val = *p++) == 0) { \
129 val = 254 + *p++; \
130 } else if (!--val) { \
131 val = *p++ << 8; \
132 val |= *p++; \
133 }
136 static long afm_find_kern(const afm_fontinfo *fontinfo,
137 int kern_idx, afm_cunicode ch2)
138 {
139 afm_cuint8 *p8 = fontinfo->kerning_data + kern_idx;
140 int num;
141 READ_ESCAPED(p8, num);
142 DLOG((stderr, " find kern, num pairs = %d\n", num));
143 while (num > 0) {
144 afm_unicode ch;
145 READ_ESCAPED(p8, ch);
146 DLOG((stderr, " pair-char = %d\n", ch));
147 if (ch == ch2) {
148 DLOG((stderr, " got kern = %d\n", *(afm_csint8*)p8));
149 return *(afm_csint8*)p8;
150 }
151 p8++;
152 num--;
153 }
154 return 0;
155 }
157 /* measure width of a text string */
158 double afm_get_text_width ( double start, const char* font, double size,
159 double tabwidth, const char* text)
160 {
161 const afm_fontinfo *fontinfo = afm_findfont(font);
162 long width = 0;
163 double widthf;
164 const unsigned char *up = (const unsigned char*)text;
165 DLOG((stderr, "================= %s\n", text));
166 if (fontinfo == NULL)
167 return size * strlen(text);
168 while (1) {
169 afm_unicode ch1, ch2;
170 int idx1, kern_idx;
171 if ((ch1 = *up) == 0)
172 break;
173 ch1 = afm_host2unicode(ch1); /* unsafe macro */
174 ch2 = *++up;
175 ch2 = afm_host2unicode(ch2); /* unsafe macro */
176 DLOG((stderr, "------------- Loop: %d + %d (%c%c) at %d\n",
177 ch1, ch2, ch1, ch2 ? ch2 : ' ',
178 (up - (const unsigned char*)text) - 1));
179 idx1 = afm_find_char_index(fontinfo, ch1);
180 DLOG((stderr, " idx1 = %d\n", idx1));
181 #if ENABLE_LIGATURES
182 if (ch2) {
183 int ch1_new = afm_find_combined_ligature(fontinfo, ch1, ch2);
184 DLOG((stderr, " lig-ch = %d\n", ch1_new));
185 if (ch1_new) {
186 ch1 = ch1_new;
187 idx1 = afm_find_char_index(fontinfo, ch1);
188 ch2 = afm_host2unicode(*++up);
189 DLOG((stderr, " -> idx1 = %d, ch2 = %d (%c)\n",
190 idx1, ch2, ch2 ? ch2 : ' '));
191 }
192 }
193 #endif
194 width += fontinfo->widths[idx1];
195 DLOG((stderr, "Plain width of %d = %d\n", ch1, fontinfo->widths[idx1]));
196 if (fontinfo->kerning_index && ch2) {
197 kern_idx = fontinfo->kerning_index[idx1];
198 DLOG((stderr, " kern_idx = %d\n", kern_idx));
199 if (kern_idx > 0)
200 width += afm_find_kern(fontinfo, kern_idx, ch2);
201 }
202 }
203 widthf = (width * 6 / 1000.0) * size;
204 DLOG((stderr, "Returns %ld (%ld) -> %f\n", width, width * 6, widthf));
205 return widthf;
206 }
208 #ifdef __APPLE__
209 const unsigned char afm_mac2iso[128] = {
210 '\xC4', '\xC5', '\xC7', '\xC9', '\xD1', '\xD6', '\xDC', '\xE1', /* 80 */
211 '\xE0', '\xE2', '\xE4', '\xE3', '\xE5', '\xE7', '\xE9', '\xE8', /* 88 */
212 '\xEA', '\xEB', '\xED', '\xEC', '\xEE', '\xEF', '\xF1', '\xF3', /* 90 */
213 '\xF2', '\xF4', '\xF6', '\xF5', '\xFA', '\xF9', '\xFB', '\xFC', /* 98 */
214 '\xDD', '\xB0', '\xA2', '\xA3', '\xA7', ' ', '\xB6', '\xDF', /* A0 */
215 '\xAE', '\xA9', ' ', '\xB4', '\xA8', ' ', '\xC6', '\xD8', /* A8 */
216 ' ', '\xB1', '\xBE', ' ', '\xA5', '\xB5', ' ', ' ', /* B0 */
217 '\xBD', '\xBC', ' ', '\xAA', '\xBA', ' ', '\xE6', '\xF8', /* B8 */
218 '\xBF', '\xA1', '\xAC', ' ', ' ', ' ', ' ', '\xAB', /* C0 */
219 '\xBB', ' ', '\xA0', '\xC0', '\xC3', '\xD5', ' ', '\xA6', /* C8 */
220 '\xAD', ' ', '"', '"', '\'', '\'', '\xF7', '\xD7', /* D0 */
221 '\xFF', ' ', ' ', '\xA4', '\xD0', '\xF0', '\xDE', '\xFE', /* D8 */
222 '\xFD', '\xB7', ' ', ' ', ' ', '\xC2', '\xCA', '\xC1', /* E0 */
223 '\xCB', '\xC8', '\xCD', '\xCE', '\xCF', '\xCC', '\xD3', '\xD4', /* E8 */
224 ' ', '\xD2', '\xDA', '\xDB', '\xD9', ' ', ' ', ' ', /* F0 */
225 '\xAF', ' ', ' ', ' ', '\xB8', ' ', ' ', ' ', /* F8 */
226 };
227 #endif