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337 lines
10 KiB
C++
337 lines
10 KiB
C++
// Copyright (c) 2009 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include <string>
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#include "os2.h"
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#include "head.h"
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// OS/2 - OS/2 and Windows Metrics
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// http://www.microsoft.com/typography/otspec/os2.htm
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#define TABLE_NAME "OS/2"
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namespace ots {
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bool ots_os2_parse(Font *font, const uint8_t *data, size_t length) {
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Buffer table(data, length);
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OpenTypeOS2 *os2 = new OpenTypeOS2;
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font->os2 = os2;
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if (!table.ReadU16(&os2->version) ||
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!table.ReadS16(&os2->avg_char_width) ||
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!table.ReadU16(&os2->weight_class) ||
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!table.ReadU16(&os2->width_class) ||
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!table.ReadU16(&os2->type) ||
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!table.ReadS16(&os2->subscript_x_size) ||
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!table.ReadS16(&os2->subscript_y_size) ||
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!table.ReadS16(&os2->subscript_x_offset) ||
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!table.ReadS16(&os2->subscript_y_offset) ||
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!table.ReadS16(&os2->superscript_x_size) ||
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!table.ReadS16(&os2->superscript_y_size) ||
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!table.ReadS16(&os2->superscript_x_offset) ||
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!table.ReadS16(&os2->superscript_y_offset) ||
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!table.ReadS16(&os2->strikeout_size) ||
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!table.ReadS16(&os2->strikeout_position) ||
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!table.ReadS16(&os2->family_class)) {
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return OTS_FAILURE_MSG("Error reading basic table elements");
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}
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if (os2->version > 5) {
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return OTS_FAILURE_MSG("Unsupported table version: %u", os2->version);
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}
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// Follow WPF Font Selection Model's advice.
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if (1 <= os2->weight_class && os2->weight_class <= 9) {
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OTS_WARNING("Bad usWeightClass: %u, changing it to: %u", os2->weight_class, os2->weight_class * 100);
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os2->weight_class *= 100;
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}
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// Ditto.
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if (os2->weight_class > 999) {
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OTS_WARNING("Bad usWeightClass: %u, changing it to: %d", os2->weight_class, 999);
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os2->weight_class = 999;
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}
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if (os2->width_class < 1) {
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OTS_WARNING("Bad usWidthClass: %u, changing it to: %d", os2->width_class, 1);
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os2->width_class = 1;
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} else if (os2->width_class > 9) {
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OTS_WARNING("Bad usWidthClass: %u, changing it to: %d", os2->width_class, 9);
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os2->width_class = 9;
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}
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// lowest 3 bits of fsType are exclusive.
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if (os2->type & 0x2) {
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// mask bits 2 & 3.
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os2->type &= 0xfff3u;
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} else if (os2->type & 0x4) {
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// mask bits 1 & 3.
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os2->type &= 0xfff4u;
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} else if (os2->type & 0x8) {
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// mask bits 1 & 2.
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os2->type &= 0xfff9u;
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}
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// mask reserved bits. use only 0..3, 8, 9 bits.
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os2->type &= 0x30f;
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#define SET_TO_ZERO(a, b) \
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if (os2->b < 0) { \
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OTS_WARNING("Bad " a ": %d, setting it to zero", os2->b); \
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os2->b = 0; \
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}
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SET_TO_ZERO("ySubscriptXSize", subscript_x_size);
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SET_TO_ZERO("ySubscriptYSize", subscript_y_size);
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SET_TO_ZERO("ySuperscriptXSize", superscript_x_size);
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SET_TO_ZERO("ySuperscriptYSize", superscript_y_size);
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SET_TO_ZERO("yStrikeoutSize", strikeout_size);
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#undef SET_TO_ZERO
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static std::string panose_strings[10] = {
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"bFamilyType",
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"bSerifStyle",
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"bWeight",
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"bProportion",
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"bContrast",
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"bStrokeVariation",
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"bArmStyle",
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"bLetterform",
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"bMidline",
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"bXHeight",
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};
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for (unsigned i = 0; i < 10; ++i) {
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if (!table.ReadU8(&os2->panose[i])) {
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return OTS_FAILURE_MSG("Error reading PANOSE %s", panose_strings[i].c_str());
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}
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}
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if (!table.ReadU32(&os2->unicode_range_1) ||
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!table.ReadU32(&os2->unicode_range_2) ||
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!table.ReadU32(&os2->unicode_range_3) ||
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!table.ReadU32(&os2->unicode_range_4) ||
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!table.ReadU32(&os2->vendor_id) ||
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!table.ReadU16(&os2->selection) ||
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!table.ReadU16(&os2->first_char_index) ||
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!table.ReadU16(&os2->last_char_index) ||
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!table.ReadS16(&os2->typo_ascender) ||
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!table.ReadS16(&os2->typo_descender) ||
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!table.ReadS16(&os2->typo_linegap) ||
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!table.ReadU16(&os2->win_ascent) ||
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!table.ReadU16(&os2->win_descent)) {
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return OTS_FAILURE_MSG("Error reading more basic table fields");
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}
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// If bit 6 is set, then bits 0 and 5 must be clear.
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if (os2->selection & 0x40) {
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os2->selection &= 0xffdeu;
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}
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// the settings of bits 0 and 1 must be reflected in the macStyle bits
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// in the 'head' table.
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if (!font->head) {
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return OTS_FAILURE_MSG("Needed head table is missing from the font");
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}
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if ((os2->selection & 0x1) &&
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!(font->head->mac_style & 0x2)) {
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OTS_WARNING("adjusting Mac style (italic)");
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font->head->mac_style |= 0x2;
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}
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if ((os2->selection & 0x2) &&
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!(font->head->mac_style & 0x4)) {
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OTS_WARNING("adjusting Mac style (underscore)");
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font->head->mac_style |= 0x4;
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}
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// While bit 6 on implies that bits 0 and 1 of macStyle are clear,
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// the reverse is not true.
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if ((os2->selection & 0x40) &&
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(font->head->mac_style & 0x3)) {
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OTS_WARNING("adjusting Mac style (regular)");
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font->head->mac_style &= 0xfffcu;
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}
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if ((os2->version < 4) &&
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(os2->selection & 0x300)) {
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// bit 8 and 9 must be unset in OS/2 table versions less than 4.
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return OTS_FAILURE_MSG("Version %d incompatible with selection %d", os2->version, os2->selection);
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}
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// mask reserved bits. use only 0..9 bits.
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os2->selection &= 0x3ff;
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if (os2->first_char_index > os2->last_char_index) {
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return OTS_FAILURE_MSG("first char index %d > last char index %d in os2", os2->first_char_index, os2->last_char_index);
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}
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if (os2->typo_linegap < 0) {
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OTS_WARNING("bad linegap: %d", os2->typo_linegap);
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os2->typo_linegap = 0;
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}
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if (os2->version < 1) {
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// http://www.microsoft.com/typography/otspec/os2ver0.htm
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return true;
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}
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if (length < offsetof(OpenTypeOS2, code_page_range_2)) {
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OTS_WARNING("bad version number: %u", os2->version);
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// Some fonts (e.g., kredit1.ttf and quinquef.ttf) have weird version
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// numbers. Fix them.
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os2->version = 0;
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return true;
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}
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if (!table.ReadU32(&os2->code_page_range_1) ||
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!table.ReadU32(&os2->code_page_range_2)) {
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return OTS_FAILURE_MSG("Failed to read codepage ranges");
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}
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if (os2->version < 2) {
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// http://www.microsoft.com/typography/otspec/os2ver1.htm
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return true;
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}
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if (length < offsetof(OpenTypeOS2, max_context)) {
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OTS_WARNING("bad version number: %u", os2->version);
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// some Japanese fonts (e.g., mona.ttf) have weird version number.
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// fix them.
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os2->version = 1;
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return true;
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}
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if (!table.ReadS16(&os2->x_height) ||
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!table.ReadS16(&os2->cap_height) ||
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!table.ReadU16(&os2->default_char) ||
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!table.ReadU16(&os2->break_char) ||
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!table.ReadU16(&os2->max_context)) {
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return OTS_FAILURE_MSG("Failed to read version 2-specific fields");
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}
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if (os2->x_height < 0) {
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OTS_WARNING("bad x_height: %d", os2->x_height);
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os2->x_height = 0;
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}
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if (os2->cap_height < 0) {
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OTS_WARNING("bad cap_height: %d", os2->cap_height);
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os2->cap_height = 0;
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}
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if (os2->version < 5) {
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// http://www.microsoft.com/typography/otspec/os2ver4.htm
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return true;
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}
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if (!table.ReadU16(&os2->lower_optical_pointsize) ||
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!table.ReadU16(&os2->upper_optical_pointsize)) {
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return OTS_FAILURE_MSG("Failed to read version 5-specific fields");
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}
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if (os2->lower_optical_pointsize > 0xFFFE) {
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OTS_WARNING("'usLowerOpticalPointSize' is bigger than 0xFFFE: %d", os2->lower_optical_pointsize);
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os2->lower_optical_pointsize = 0xFFFE;
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}
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if (os2->upper_optical_pointsize < 2) {
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OTS_WARNING("'usUpperOpticalPointSize' is lower than 2: %d", os2->upper_optical_pointsize);
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os2->upper_optical_pointsize = 2;
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}
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return true;
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}
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bool ots_os2_should_serialise(Font *font) {
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return font->os2 != NULL;
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}
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bool ots_os2_serialise(OTSStream *out, Font *font) {
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const OpenTypeOS2 *os2 = font->os2;
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if (!out->WriteU16(os2->version) ||
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!out->WriteS16(os2->avg_char_width) ||
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!out->WriteU16(os2->weight_class) ||
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!out->WriteU16(os2->width_class) ||
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!out->WriteU16(os2->type) ||
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!out->WriteS16(os2->subscript_x_size) ||
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!out->WriteS16(os2->subscript_y_size) ||
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!out->WriteS16(os2->subscript_x_offset) ||
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!out->WriteS16(os2->subscript_y_offset) ||
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!out->WriteS16(os2->superscript_x_size) ||
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!out->WriteS16(os2->superscript_y_size) ||
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!out->WriteS16(os2->superscript_x_offset) ||
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!out->WriteS16(os2->superscript_y_offset) ||
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!out->WriteS16(os2->strikeout_size) ||
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!out->WriteS16(os2->strikeout_position) ||
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!out->WriteS16(os2->family_class)) {
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return OTS_FAILURE_MSG("Failed to write basic OS2 information");
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}
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for (unsigned i = 0; i < 10; ++i) {
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if (!out->Write(&os2->panose[i], 1)) {
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return OTS_FAILURE_MSG("Failed to write os2 panose information");
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}
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}
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if (!out->WriteU32(os2->unicode_range_1) ||
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!out->WriteU32(os2->unicode_range_2) ||
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!out->WriteU32(os2->unicode_range_3) ||
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!out->WriteU32(os2->unicode_range_4) ||
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!out->WriteU32(os2->vendor_id) ||
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!out->WriteU16(os2->selection) ||
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!out->WriteU16(os2->first_char_index) ||
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!out->WriteU16(os2->last_char_index) ||
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!out->WriteS16(os2->typo_ascender) ||
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!out->WriteS16(os2->typo_descender) ||
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!out->WriteS16(os2->typo_linegap) ||
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!out->WriteU16(os2->win_ascent) ||
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!out->WriteU16(os2->win_descent)) {
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return OTS_FAILURE_MSG("Failed to write version 1-specific fields");
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}
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if (os2->version < 1) {
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return true;
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}
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if (!out->WriteU32(os2->code_page_range_1) ||
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!out->WriteU32(os2->code_page_range_2)) {
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return OTS_FAILURE_MSG("Failed to write codepage ranges");
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}
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if (os2->version < 2) {
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return true;
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}
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if (!out->WriteS16(os2->x_height) ||
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!out->WriteS16(os2->cap_height) ||
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!out->WriteU16(os2->default_char) ||
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!out->WriteU16(os2->break_char) ||
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!out->WriteU16(os2->max_context)) {
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return OTS_FAILURE_MSG("Failed to write version 2-specific fields");
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}
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if (os2->version < 5) {
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return true;
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}
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if (!out->WriteU16(os2->lower_optical_pointsize) ||
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!out->WriteU16(os2->upper_optical_pointsize)) {
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return OTS_FAILURE_MSG("Failed to write version 5-specific fields");
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}
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return true;
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}
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void ots_os2_reuse(Font *font, Font *other) {
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font->os2 = other->os2;
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font->os2_reused = true;
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}
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void ots_os2_free(Font *font) {
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delete font->os2;
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}
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} // namespace ots
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#undef TABLE_NAME
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