1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/ots/src/os2.cc Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,292 @@
1.4 +// Copyright (c) 2009 The Chromium Authors. All rights reserved.
1.5 +// Use of this source code is governed by a BSD-style license that can be
1.6 +// found in the LICENSE file.
1.7 +
1.8 +#include "os2.h"
1.9 +
1.10 +#include "head.h"
1.11 +
1.12 +// OS/2 - OS/2 and Windows Metrics
1.13 +// http://www.microsoft.com/typography/otspec/os2.htm
1.14 +
1.15 +#define TABLE_NAME "OS/2"
1.16 +
1.17 +namespace ots {
1.18 +
1.19 +bool ots_os2_parse(OpenTypeFile *file, const uint8_t *data, size_t length) {
1.20 + Buffer table(data, length);
1.21 +
1.22 + OpenTypeOS2 *os2 = new OpenTypeOS2;
1.23 + file->os2 = os2;
1.24 +
1.25 + if (!table.ReadU16(&os2->version) ||
1.26 + !table.ReadS16(&os2->avg_char_width) ||
1.27 + !table.ReadU16(&os2->weight_class) ||
1.28 + !table.ReadU16(&os2->width_class) ||
1.29 + !table.ReadU16(&os2->type) ||
1.30 + !table.ReadS16(&os2->subscript_x_size) ||
1.31 + !table.ReadS16(&os2->subscript_y_size) ||
1.32 + !table.ReadS16(&os2->subscript_x_offset) ||
1.33 + !table.ReadS16(&os2->subscript_y_offset) ||
1.34 + !table.ReadS16(&os2->superscript_x_size) ||
1.35 + !table.ReadS16(&os2->superscript_y_size) ||
1.36 + !table.ReadS16(&os2->superscript_x_offset) ||
1.37 + !table.ReadS16(&os2->superscript_y_offset) ||
1.38 + !table.ReadS16(&os2->strikeout_size) ||
1.39 + !table.ReadS16(&os2->strikeout_position) ||
1.40 + !table.ReadS16(&os2->family_class)) {
1.41 + return OTS_FAILURE_MSG("Failed toi read basic os2 elements");
1.42 + }
1.43 +
1.44 + if (os2->version > 4) {
1.45 + return OTS_FAILURE_MSG("os2 version too high %d", os2->version);
1.46 + }
1.47 +
1.48 + // Some linux fonts (e.g., Kedage-t.ttf and LucidaSansDemiOblique.ttf) have
1.49 + // weird weight/width classes. Overwrite them with FW_NORMAL/1/9.
1.50 + if (os2->weight_class < 100 ||
1.51 + os2->weight_class > 900 ||
1.52 + os2->weight_class % 100) {
1.53 + OTS_WARNING("bad weight: %u", os2->weight_class);
1.54 + os2->weight_class = 400; // FW_NORMAL
1.55 + }
1.56 + if (os2->width_class < 1) {
1.57 + OTS_WARNING("bad width: %u", os2->width_class);
1.58 + os2->width_class = 1;
1.59 + } else if (os2->width_class > 9) {
1.60 + OTS_WARNING("bad width: %u", os2->width_class);
1.61 + os2->width_class = 9;
1.62 + }
1.63 +
1.64 + // lowest 3 bits of fsType are exclusive.
1.65 + if (os2->type & 0x2) {
1.66 + // mask bits 2 & 3.
1.67 + os2->type &= 0xfff3u;
1.68 + } else if (os2->type & 0x4) {
1.69 + // mask bits 1 & 3.
1.70 + os2->type &= 0xfff4u;
1.71 + } else if (os2->type & 0x8) {
1.72 + // mask bits 1 & 2.
1.73 + os2->type &= 0xfff9u;
1.74 + }
1.75 +
1.76 + // mask reserved bits. use only 0..3, 8, 9 bits.
1.77 + os2->type &= 0x30f;
1.78 +
1.79 + if (os2->subscript_x_size < 0) {
1.80 + OTS_WARNING("bad subscript_x_size: %d", os2->subscript_x_size);
1.81 + os2->subscript_x_size = 0;
1.82 + }
1.83 + if (os2->subscript_y_size < 0) {
1.84 + OTS_WARNING("bad subscript_y_size: %d", os2->subscript_y_size);
1.85 + os2->subscript_y_size = 0;
1.86 + }
1.87 + if (os2->superscript_x_size < 0) {
1.88 + OTS_WARNING("bad superscript_x_size: %d", os2->superscript_x_size);
1.89 + os2->superscript_x_size = 0;
1.90 + }
1.91 + if (os2->superscript_y_size < 0) {
1.92 + OTS_WARNING("bad superscript_y_size: %d", os2->superscript_y_size);
1.93 + os2->superscript_y_size = 0;
1.94 + }
1.95 + if (os2->strikeout_size < 0) {
1.96 + OTS_WARNING("bad strikeout_size: %d", os2->strikeout_size);
1.97 + os2->strikeout_size = 0;
1.98 + }
1.99 +
1.100 + for (unsigned i = 0; i < 10; ++i) {
1.101 + if (!table.ReadU8(&os2->panose[i])) {
1.102 + return OTS_FAILURE_MSG("Failed to read panose in os2 table");
1.103 + }
1.104 + }
1.105 +
1.106 + if (!table.ReadU32(&os2->unicode_range_1) ||
1.107 + !table.ReadU32(&os2->unicode_range_2) ||
1.108 + !table.ReadU32(&os2->unicode_range_3) ||
1.109 + !table.ReadU32(&os2->unicode_range_4) ||
1.110 + !table.ReadU32(&os2->vendor_id) ||
1.111 + !table.ReadU16(&os2->selection) ||
1.112 + !table.ReadU16(&os2->first_char_index) ||
1.113 + !table.ReadU16(&os2->last_char_index) ||
1.114 + !table.ReadS16(&os2->typo_ascender) ||
1.115 + !table.ReadS16(&os2->typo_descender) ||
1.116 + !table.ReadS16(&os2->typo_linegap) ||
1.117 + !table.ReadU16(&os2->win_ascent) ||
1.118 + !table.ReadU16(&os2->win_descent)) {
1.119 + return OTS_FAILURE_MSG("Failed to read more basic os2 fields");
1.120 + }
1.121 +
1.122 + // If bit 6 is set, then bits 0 and 5 must be clear.
1.123 + if (os2->selection & 0x40) {
1.124 + os2->selection &= 0xffdeu;
1.125 + }
1.126 +
1.127 + // the settings of bits 0 and 1 must be reflected in the macStyle bits
1.128 + // in the 'head' table.
1.129 + if (!file->head) {
1.130 + return OTS_FAILURE_MSG("Head table missing from font as needed by os2 table");
1.131 + }
1.132 + if ((os2->selection & 0x1) &&
1.133 + !(file->head->mac_style & 0x2)) {
1.134 + OTS_WARNING("adjusting Mac style (italic)");
1.135 + file->head->mac_style |= 0x2;
1.136 + }
1.137 + if ((os2->selection & 0x2) &&
1.138 + !(file->head->mac_style & 0x4)) {
1.139 + OTS_WARNING("adjusting Mac style (underscore)");
1.140 + file->head->mac_style |= 0x4;
1.141 + }
1.142 +
1.143 + // While bit 6 on implies that bits 0 and 1 of macStyle are clear,
1.144 + // the reverse is not true.
1.145 + if ((os2->selection & 0x40) &&
1.146 + (file->head->mac_style & 0x3)) {
1.147 + OTS_WARNING("adjusting Mac style (regular)");
1.148 + file->head->mac_style &= 0xfffcu;
1.149 + }
1.150 +
1.151 + if ((os2->version < 4) &&
1.152 + (os2->selection & 0x300)) {
1.153 + // bit 8 and 9 must be unset in OS/2 table versions less than 4.
1.154 + return OTS_FAILURE_MSG("OS2 version %d incompatible with selection %d", os2->version, os2->selection);
1.155 + }
1.156 +
1.157 + // mask reserved bits. use only 0..9 bits.
1.158 + os2->selection &= 0x3ff;
1.159 +
1.160 + if (os2->first_char_index > os2->last_char_index) {
1.161 + return OTS_FAILURE_MSG("first char index %d > last char index %d in os2", os2->first_char_index, os2->last_char_index);
1.162 + }
1.163 + if (os2->typo_linegap < 0) {
1.164 + OTS_WARNING("bad linegap: %d", os2->typo_linegap);
1.165 + os2->typo_linegap = 0;
1.166 + }
1.167 +
1.168 + if (os2->version < 1) {
1.169 + // http://www.microsoft.com/typography/otspec/os2ver0.htm
1.170 + return true;
1.171 + }
1.172 +
1.173 + if (length < offsetof(OpenTypeOS2, code_page_range_2)) {
1.174 + OTS_WARNING("bad version number: %u", os2->version);
1.175 + // Some fonts (e.g., kredit1.ttf and quinquef.ttf) have weird version
1.176 + // numbers. Fix them.
1.177 + os2->version = 0;
1.178 + return true;
1.179 + }
1.180 +
1.181 + if (!table.ReadU32(&os2->code_page_range_1) ||
1.182 + !table.ReadU32(&os2->code_page_range_2)) {
1.183 + return OTS_FAILURE_MSG("Failed to read codepage ranges");
1.184 + }
1.185 +
1.186 + if (os2->version < 2) {
1.187 + // http://www.microsoft.com/typography/otspec/os2ver1.htm
1.188 + return true;
1.189 + }
1.190 +
1.191 + if (length < offsetof(OpenTypeOS2, max_context)) {
1.192 + OTS_WARNING("bad version number: %u", os2->version);
1.193 + // some Japanese fonts (e.g., mona.ttf) have weird version number.
1.194 + // fix them.
1.195 + os2->version = 1;
1.196 + return true;
1.197 + }
1.198 +
1.199 + if (!table.ReadS16(&os2->x_height) ||
1.200 + !table.ReadS16(&os2->cap_height) ||
1.201 + !table.ReadU16(&os2->default_char) ||
1.202 + !table.ReadU16(&os2->break_char) ||
1.203 + !table.ReadU16(&os2->max_context)) {
1.204 + return OTS_FAILURE_MSG("Failed to read os2 version 2 information");
1.205 + }
1.206 +
1.207 + if (os2->x_height < 0) {
1.208 + OTS_WARNING("bad x_height: %d", os2->x_height);
1.209 + os2->x_height = 0;
1.210 + }
1.211 + if (os2->cap_height < 0) {
1.212 + OTS_WARNING("bad cap_height: %d", os2->cap_height);
1.213 + os2->cap_height = 0;
1.214 + }
1.215 +
1.216 + return true;
1.217 +}
1.218 +
1.219 +bool ots_os2_should_serialise(OpenTypeFile *file) {
1.220 + return file->os2 != NULL;
1.221 +}
1.222 +
1.223 +bool ots_os2_serialise(OTSStream *out, OpenTypeFile *file) {
1.224 + const OpenTypeOS2 *os2 = file->os2;
1.225 +
1.226 + if (!out->WriteU16(os2->version) ||
1.227 + !out->WriteS16(os2->avg_char_width) ||
1.228 + !out->WriteU16(os2->weight_class) ||
1.229 + !out->WriteU16(os2->width_class) ||
1.230 + !out->WriteU16(os2->type) ||
1.231 + !out->WriteS16(os2->subscript_x_size) ||
1.232 + !out->WriteS16(os2->subscript_y_size) ||
1.233 + !out->WriteS16(os2->subscript_x_offset) ||
1.234 + !out->WriteS16(os2->subscript_y_offset) ||
1.235 + !out->WriteS16(os2->superscript_x_size) ||
1.236 + !out->WriteS16(os2->superscript_y_size) ||
1.237 + !out->WriteS16(os2->superscript_x_offset) ||
1.238 + !out->WriteS16(os2->superscript_y_offset) ||
1.239 + !out->WriteS16(os2->strikeout_size) ||
1.240 + !out->WriteS16(os2->strikeout_position) ||
1.241 + !out->WriteS16(os2->family_class)) {
1.242 + return OTS_FAILURE_MSG("Failed to write basic OS2 information");
1.243 + }
1.244 +
1.245 + for (unsigned i = 0; i < 10; ++i) {
1.246 + if (!out->Write(&os2->panose[i], 1)) {
1.247 + return OTS_FAILURE_MSG("Failed to write os2 panose information");
1.248 + }
1.249 + }
1.250 +
1.251 + if (!out->WriteU32(os2->unicode_range_1) ||
1.252 + !out->WriteU32(os2->unicode_range_2) ||
1.253 + !out->WriteU32(os2->unicode_range_3) ||
1.254 + !out->WriteU32(os2->unicode_range_4) ||
1.255 + !out->WriteU32(os2->vendor_id) ||
1.256 + !out->WriteU16(os2->selection) ||
1.257 + !out->WriteU16(os2->first_char_index) ||
1.258 + !out->WriteU16(os2->last_char_index) ||
1.259 + !out->WriteS16(os2->typo_ascender) ||
1.260 + !out->WriteS16(os2->typo_descender) ||
1.261 + !out->WriteS16(os2->typo_linegap) ||
1.262 + !out->WriteU16(os2->win_ascent) ||
1.263 + !out->WriteU16(os2->win_descent)) {
1.264 + return OTS_FAILURE_MSG("Failed to write os2 version 1 information");
1.265 + }
1.266 +
1.267 + if (os2->version < 1) {
1.268 + return true;
1.269 + }
1.270 +
1.271 + if (!out->WriteU32(os2->code_page_range_1) ||
1.272 + !out->WriteU32(os2->code_page_range_2)) {
1.273 + return OTS_FAILURE_MSG("Failed to write codepage ranges");
1.274 + }
1.275 +
1.276 + if (os2->version < 2) {
1.277 + return true;
1.278 + }
1.279 +
1.280 + if (!out->WriteS16(os2->x_height) ||
1.281 + !out->WriteS16(os2->cap_height) ||
1.282 + !out->WriteU16(os2->default_char) ||
1.283 + !out->WriteU16(os2->break_char) ||
1.284 + !out->WriteU16(os2->max_context)) {
1.285 + return OTS_FAILURE_MSG("Failed to write os2 version 2 information");
1.286 + }
1.287 +
1.288 + return true;
1.289 +}
1.290 +
1.291 +void ots_os2_free(OpenTypeFile *file) {
1.292 + delete file->os2;
1.293 +}
1.294 +
1.295 +} // namespace ots
