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comparison: gfx/ots/src/os2.cc

gfx/ots/src/os2.cc

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1 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "os2.h"
6
7 #include "head.h"
8
9 // OS/2 - OS/2 and Windows Metrics
10 // http://www.microsoft.com/typography/otspec/os2.htm
11
12 #define TABLE_NAME "OS/2"
13
14 namespace ots {
15
16 bool ots_os2_parse(OpenTypeFile *file, const uint8_t *data, size_t length) {
17 Buffer table(data, length);
18
19 OpenTypeOS2 *os2 = new OpenTypeOS2;
20 file->os2 = os2;
21
22 if (!table.ReadU16(&os2->version) ||
23 !table.ReadS16(&os2->avg_char_width) ||
24 !table.ReadU16(&os2->weight_class) ||
25 !table.ReadU16(&os2->width_class) ||
26 !table.ReadU16(&os2->type) ||
27 !table.ReadS16(&os2->subscript_x_size) ||
28 !table.ReadS16(&os2->subscript_y_size) ||
29 !table.ReadS16(&os2->subscript_x_offset) ||
30 !table.ReadS16(&os2->subscript_y_offset) ||
31 !table.ReadS16(&os2->superscript_x_size) ||
32 !table.ReadS16(&os2->superscript_y_size) ||
33 !table.ReadS16(&os2->superscript_x_offset) ||
34 !table.ReadS16(&os2->superscript_y_offset) ||
35 !table.ReadS16(&os2->strikeout_size) ||
36 !table.ReadS16(&os2->strikeout_position) ||
37 !table.ReadS16(&os2->family_class)) {
38 return OTS_FAILURE_MSG("Failed toi read basic os2 elements");
39 }
40
41 if (os2->version > 4) {
42 return OTS_FAILURE_MSG("os2 version too high %d", os2->version);
43 }
44
45 // Some linux fonts (e.g., Kedage-t.ttf and LucidaSansDemiOblique.ttf) have
46 // weird weight/width classes. Overwrite them with FW_NORMAL/1/9.
47 if (os2->weight_class < 100 ||
48 os2->weight_class > 900 ||
49 os2->weight_class % 100) {
50 OTS_WARNING("bad weight: %u", os2->weight_class);
51 os2->weight_class = 400; // FW_NORMAL
52 }
53 if (os2->width_class < 1) {
54 OTS_WARNING("bad width: %u", os2->width_class);
55 os2->width_class = 1;
56 } else if (os2->width_class > 9) {
57 OTS_WARNING("bad width: %u", os2->width_class);
58 os2->width_class = 9;
59 }
60
61 // lowest 3 bits of fsType are exclusive.
62 if (os2->type & 0x2) {
63 // mask bits 2 & 3.
64 os2->type &= 0xfff3u;
65 } else if (os2->type & 0x4) {
66 // mask bits 1 & 3.
67 os2->type &= 0xfff4u;
68 } else if (os2->type & 0x8) {
69 // mask bits 1 & 2.
70 os2->type &= 0xfff9u;
71 }
72
73 // mask reserved bits. use only 0..3, 8, 9 bits.
74 os2->type &= 0x30f;
75
76 if (os2->subscript_x_size < 0) {
77 OTS_WARNING("bad subscript_x_size: %d", os2->subscript_x_size);
78 os2->subscript_x_size = 0;
79 }
80 if (os2->subscript_y_size < 0) {
81 OTS_WARNING("bad subscript_y_size: %d", os2->subscript_y_size);
82 os2->subscript_y_size = 0;
83 }
84 if (os2->superscript_x_size < 0) {
85 OTS_WARNING("bad superscript_x_size: %d", os2->superscript_x_size);
86 os2->superscript_x_size = 0;
87 }
88 if (os2->superscript_y_size < 0) {
89 OTS_WARNING("bad superscript_y_size: %d", os2->superscript_y_size);
90 os2->superscript_y_size = 0;
91 }
92 if (os2->strikeout_size < 0) {
93 OTS_WARNING("bad strikeout_size: %d", os2->strikeout_size);
94 os2->strikeout_size = 0;
95 }
96
97 for (unsigned i = 0; i < 10; ++i) {
98 if (!table.ReadU8(&os2->panose[i])) {
99 return OTS_FAILURE_MSG("Failed to read panose in os2 table");
100 }
101 }
102
103 if (!table.ReadU32(&os2->unicode_range_1) ||
104 !table.ReadU32(&os2->unicode_range_2) ||
105 !table.ReadU32(&os2->unicode_range_3) ||
106 !table.ReadU32(&os2->unicode_range_4) ||
107 !table.ReadU32(&os2->vendor_id) ||
108 !table.ReadU16(&os2->selection) ||
109 !table.ReadU16(&os2->first_char_index) ||
110 !table.ReadU16(&os2->last_char_index) ||
111 !table.ReadS16(&os2->typo_ascender) ||
112 !table.ReadS16(&os2->typo_descender) ||
113 !table.ReadS16(&os2->typo_linegap) ||
114 !table.ReadU16(&os2->win_ascent) ||
115 !table.ReadU16(&os2->win_descent)) {
116 return OTS_FAILURE_MSG("Failed to read more basic os2 fields");
117 }
118
119 // If bit 6 is set, then bits 0 and 5 must be clear.
120 if (os2->selection & 0x40) {
121 os2->selection &= 0xffdeu;
122 }
123
124 // the settings of bits 0 and 1 must be reflected in the macStyle bits
125 // in the 'head' table.
126 if (!file->head) {
127 return OTS_FAILURE_MSG("Head table missing from font as needed by os2 table");
128 }
129 if ((os2->selection & 0x1) &&
130 !(file->head->mac_style & 0x2)) {
131 OTS_WARNING("adjusting Mac style (italic)");
132 file->head->mac_style |= 0x2;
133 }
134 if ((os2->selection & 0x2) &&
135 !(file->head->mac_style & 0x4)) {
136 OTS_WARNING("adjusting Mac style (underscore)");
137 file->head->mac_style |= 0x4;
138 }
139
140 // While bit 6 on implies that bits 0 and 1 of macStyle are clear,
141 // the reverse is not true.
142 if ((os2->selection & 0x40) &&
143 (file->head->mac_style & 0x3)) {
144 OTS_WARNING("adjusting Mac style (regular)");
145 file->head->mac_style &= 0xfffcu;
146 }
147
148 if ((os2->version < 4) &&
149 (os2->selection & 0x300)) {
150 // bit 8 and 9 must be unset in OS/2 table versions less than 4.
151 return OTS_FAILURE_MSG("OS2 version %d incompatible with selection %d", os2->version, os2->selection);
152 }
153
154 // mask reserved bits. use only 0..9 bits.
155 os2->selection &= 0x3ff;
156
157 if (os2->first_char_index > os2->last_char_index) {
158 return OTS_FAILURE_MSG("first char index %d > last char index %d in os2", os2->first_char_index, os2->last_char_index);
159 }
160 if (os2->typo_linegap < 0) {
161 OTS_WARNING("bad linegap: %d", os2->typo_linegap);
162 os2->typo_linegap = 0;
163 }
164
165 if (os2->version < 1) {
166 // http://www.microsoft.com/typography/otspec/os2ver0.htm
167 return true;
168 }
169
170 if (length < offsetof(OpenTypeOS2, code_page_range_2)) {
171 OTS_WARNING("bad version number: %u", os2->version);
172 // Some fonts (e.g., kredit1.ttf and quinquef.ttf) have weird version
173 // numbers. Fix them.
174 os2->version = 0;
175 return true;
176 }
177
178 if (!table.ReadU32(&os2->code_page_range_1) ||
179 !table.ReadU32(&os2->code_page_range_2)) {
180 return OTS_FAILURE_MSG("Failed to read codepage ranges");
181 }
182
183 if (os2->version < 2) {
184 // http://www.microsoft.com/typography/otspec/os2ver1.htm
185 return true;
186 }
187
188 if (length < offsetof(OpenTypeOS2, max_context)) {
189 OTS_WARNING("bad version number: %u", os2->version);
190 // some Japanese fonts (e.g., mona.ttf) have weird version number.
191 // fix them.
192 os2->version = 1;
193 return true;
194 }
195
196 if (!table.ReadS16(&os2->x_height) ||
197 !table.ReadS16(&os2->cap_height) ||
198 !table.ReadU16(&os2->default_char) ||
199 !table.ReadU16(&os2->break_char) ||
200 !table.ReadU16(&os2->max_context)) {
201 return OTS_FAILURE_MSG("Failed to read os2 version 2 information");
202 }
203
204 if (os2->x_height < 0) {
205 OTS_WARNING("bad x_height: %d", os2->x_height);
206 os2->x_height = 0;
207 }
208 if (os2->cap_height < 0) {
209 OTS_WARNING("bad cap_height: %d", os2->cap_height);
210 os2->cap_height = 0;
211 }
212
213 return true;
214 }
215
216 bool ots_os2_should_serialise(OpenTypeFile *file) {
217 return file->os2 != NULL;
218 }
219
220 bool ots_os2_serialise(OTSStream *out, OpenTypeFile *file) {
221 const OpenTypeOS2 *os2 = file->os2;
222
223 if (!out->WriteU16(os2->version) ||
224 !out->WriteS16(os2->avg_char_width) ||
225 !out->WriteU16(os2->weight_class) ||
226 !out->WriteU16(os2->width_class) ||
227 !out->WriteU16(os2->type) ||
228 !out->WriteS16(os2->subscript_x_size) ||
229 !out->WriteS16(os2->subscript_y_size) ||
230 !out->WriteS16(os2->subscript_x_offset) ||
231 !out->WriteS16(os2->subscript_y_offset) ||
232 !out->WriteS16(os2->superscript_x_size) ||
233 !out->WriteS16(os2->superscript_y_size) ||
234 !out->WriteS16(os2->superscript_x_offset) ||
235 !out->WriteS16(os2->superscript_y_offset) ||
236 !out->WriteS16(os2->strikeout_size) ||
237 !out->WriteS16(os2->strikeout_position) ||
238 !out->WriteS16(os2->family_class)) {
239 return OTS_FAILURE_MSG("Failed to write basic OS2 information");
240 }
241
242 for (unsigned i = 0; i < 10; ++i) {
243 if (!out->Write(&os2->panose[i], 1)) {
244 return OTS_FAILURE_MSG("Failed to write os2 panose information");
245 }
246 }
247
248 if (!out->WriteU32(os2->unicode_range_1) ||
249 !out->WriteU32(os2->unicode_range_2) ||
250 !out->WriteU32(os2->unicode_range_3) ||
251 !out->WriteU32(os2->unicode_range_4) ||
252 !out->WriteU32(os2->vendor_id) ||
253 !out->WriteU16(os2->selection) ||
254 !out->WriteU16(os2->first_char_index) ||
255 !out->WriteU16(os2->last_char_index) ||
256 !out->WriteS16(os2->typo_ascender) ||
257 !out->WriteS16(os2->typo_descender) ||
258 !out->WriteS16(os2->typo_linegap) ||
259 !out->WriteU16(os2->win_ascent) ||
260 !out->WriteU16(os2->win_descent)) {
261 return OTS_FAILURE_MSG("Failed to write os2 version 1 information");
262 }
263
264 if (os2->version < 1) {
265 return true;
266 }
267
268 if (!out->WriteU32(os2->code_page_range_1) ||
269 !out->WriteU32(os2->code_page_range_2)) {
270 return OTS_FAILURE_MSG("Failed to write codepage ranges");
271 }
272
273 if (os2->version < 2) {
274 return true;
275 }
276
277 if (!out->WriteS16(os2->x_height) ||
278 !out->WriteS16(os2->cap_height) ||
279 !out->WriteU16(os2->default_char) ||
280 !out->WriteU16(os2->break_char) ||
281 !out->WriteU16(os2->max_context)) {
282 return OTS_FAILURE_MSG("Failed to write os2 version 2 information");
283 }
284
285 return true;
286 }
287
288 void ots_os2_free(OpenTypeFile *file) {
289 delete file->os2;
290 }
291
292 } // namespace ots

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