зеркало из https://github.com/mozilla/pjs.git
293 строки
8.4 KiB
C++
293 строки
8.4 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 <cstddef>
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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/opentype/otspec/os2.htm
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namespace ots {
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bool ots_os2_parse(OpenTypeFile *file, 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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file->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();
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}
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if (os2->version > 4) {
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return OTS_FAILURE();
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}
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// Some linux fonts (e.g., Kedage-t.ttf and LucidaSansDemiOblique.ttf) have
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// weird weight/width classes. Overwrite them with FW_NORMAL/1/9.
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if (os2->weight_class < 100 ||
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os2->weight_class > 900 ||
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os2->weight_class % 100) {
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OTS_WARNING("bad weight: %u", os2->weight_class);
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os2->weight_class = 400; // FW_NORMAL
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}
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if (os2->width_class < 1) {
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OTS_WARNING("bad width: %u", os2->width_class);
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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 width: %u", os2->width_class);
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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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if (os2->subscript_x_size < 0) {
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OTS_WARNING("bad subscript_x_size: %d", os2->subscript_x_size);
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os2->subscript_x_size = 0;
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}
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if (os2->subscript_y_size < 0) {
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OTS_WARNING("bad subscript_y_size: %d", os2->subscript_y_size);
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os2->subscript_y_size = 0;
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}
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if (os2->superscript_x_size < 0) {
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OTS_WARNING("bad superscript_x_size: %d", os2->superscript_x_size);
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os2->superscript_x_size = 0;
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}
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if (os2->superscript_y_size < 0) {
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OTS_WARNING("bad superscript_y_size: %d", os2->superscript_y_size);
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os2->superscript_y_size = 0;
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}
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if (os2->strikeout_size < 0) {
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OTS_WARNING("bad strikeout_size: %d", os2->strikeout_size);
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os2->strikeout_size = 0;
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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();
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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();
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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 (!file->head) {
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return OTS_FAILURE();
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}
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if ((os2->selection & 0x1) &&
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!(file->head->mac_style & 0x2)) {
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OTS_WARNING("adjusting Mac style (italic)");
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file->head->mac_style |= 0x2;
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}
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if ((os2->selection & 0x2) &&
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!(file->head->mac_style & 0x4)) {
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OTS_WARNING("adjusting Mac style (underscore)");
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file->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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(file->head->mac_style & 0x3)) {
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OTS_WARNING("adjusting Mac style (regular)");
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file->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();
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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();
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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();
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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();
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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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return true;
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}
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bool ots_os2_should_serialise(OpenTypeFile *file) {
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return file->os2;
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}
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bool ots_os2_serialise(OTSStream *out, OpenTypeFile *file) {
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const OpenTypeOS2 *os2 = file->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();
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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();
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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();
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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();
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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();
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}
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return true;
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}
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void ots_os2_free(OpenTypeFile *file) {
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delete file->os2;
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}
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} // namespace ots
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