321 lines
11 KiB
C++
321 lines
11 KiB
C++
// Copyright (c) 2009-2017 The OTS 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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namespace ots {
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bool OpenTypeOS2::Parse(const uint8_t *data, size_t length) {
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Buffer table(data, length);
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if (!table.ReadU16(&this->table.version) ||
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!table.ReadS16(&this->table.avg_char_width) ||
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!table.ReadU16(&this->table.weight_class) ||
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!table.ReadU16(&this->table.width_class) ||
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!table.ReadU16(&this->table.type) ||
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!table.ReadS16(&this->table.subscript_x_size) ||
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!table.ReadS16(&this->table.subscript_y_size) ||
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!table.ReadS16(&this->table.subscript_x_offset) ||
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!table.ReadS16(&this->table.subscript_y_offset) ||
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!table.ReadS16(&this->table.superscript_x_size) ||
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!table.ReadS16(&this->table.superscript_y_size) ||
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!table.ReadS16(&this->table.superscript_x_offset) ||
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!table.ReadS16(&this->table.superscript_y_offset) ||
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!table.ReadS16(&this->table.strikeout_size) ||
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!table.ReadS16(&this->table.strikeout_position) ||
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!table.ReadS16(&this->table.family_class)) {
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return Error("Error reading basic table elements");
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}
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if (this->table.version > 5) {
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return Error("Unsupported table version: %u", this->table.version);
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}
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if (this->table.weight_class < 1) {
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Warning("Bad usWeightClass: %u, changing it to %d",
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this->table.weight_class, 1);
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this->table.weight_class = 1;
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} else if (this->table.weight_class > 1000) {
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Warning("Bad usWeightClass: %u, changing it to %d",
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this->table.weight_class, 1000);
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this->table.weight_class = 1000;
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}
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if (this->table.width_class < 1) {
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Warning("Bad usWidthClass: %u, changing it to %d",
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this->table.width_class, 1);
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this->table.width_class = 1;
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} else if (this->table.width_class > 9) {
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Warning("Bad usWidthClass: %u, changing it to %d",
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this->table.width_class, 9);
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this->table.width_class = 9;
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}
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// lowest 3 bits of fsType are exclusive.
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if (this->table.type & 0x2) {
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// mask bits 2 & 3.
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this->table.type &= 0xfff3u;
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} else if (this->table.type & 0x4) {
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// mask bits 1 & 3.
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this->table.type &= 0xfff4u;
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} else if (this->table.type & 0x8) {
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// mask bits 1 & 2.
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this->table.type &= 0xfff9u;
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}
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// mask reserved bits. use only 0..3, 8, 9 bits.
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this->table.type &= 0x30f;
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#define SET_TO_ZERO(a, b) \
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if (this->table.b < 0) { \
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Warning("Bad " a ": %d, setting it to zero", this->table.b); \
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this->table.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 const char* 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(&this->table.panose[i])) {
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return Error("Failed to read PANOSE %s", panose_strings[i]);
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}
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}
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if (!table.ReadU32(&this->table.unicode_range_1) ||
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!table.ReadU32(&this->table.unicode_range_2) ||
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!table.ReadU32(&this->table.unicode_range_3) ||
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!table.ReadU32(&this->table.unicode_range_4) ||
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!table.ReadU32(&this->table.vendor_id) ||
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!table.ReadU16(&this->table.selection) ||
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!table.ReadU16(&this->table.first_char_index) ||
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!table.ReadU16(&this->table.last_char_index) ||
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!table.ReadS16(&this->table.typo_ascender) ||
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!table.ReadS16(&this->table.typo_descender) ||
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!table.ReadS16(&this->table.typo_linegap) ||
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!table.ReadU16(&this->table.win_ascent) ||
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!table.ReadU16(&this->table.win_descent)) {
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return Error("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 (this->table.selection & 0x40) {
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this->table.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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OpenTypeHEAD *head = static_cast<OpenTypeHEAD*>(
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GetFont()->GetTypedTable(OTS_TAG_HEAD));
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if ((this->table.selection & 0x1) &&
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head && !(head->mac_style & 0x2)) {
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Warning("Adjusting head.macStyle (italic) to match fsSelection");
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head->mac_style |= 0x2;
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}
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if ((this->table.selection & 0x2) &&
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head && !(head->mac_style & 0x4)) {
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Warning("Adjusting head.macStyle (underscore) to match fsSelection");
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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 ((this->table.selection & 0x40) &&
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head && (head->mac_style & 0x3)) {
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Warning("Adjusting head.macStyle (regular) to match fsSelection");
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head->mac_style &= 0xfffcu;
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}
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if ((this->table.version < 4) &&
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(this->table.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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Warning("fsSelection bits 8 and 9 must be unset for table version %d",
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this->table.version);
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}
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// mask reserved bits. use only 0..9 bits.
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this->table.selection &= 0x3ff;
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if (this->table.first_char_index > this->table.last_char_index) {
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Warning("usFirstCharIndex %d > usLastCharIndex %d",
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this->table.first_char_index, this->table.last_char_index);
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this->table.first_char_index = this->table.last_char_index;
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}
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if (this->table.typo_linegap < 0) {
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Warning("Bad sTypoLineGap, setting it to 0: %d", this->table.typo_linegap);
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this->table.typo_linegap = 0;
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}
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if (this->table.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(OS2Data, code_page_range_2)) {
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Warning("Bad version number, setting it to 0: %u", this->table.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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this->table.version = 0;
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return true;
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}
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if (!table.ReadU32(&this->table.code_page_range_1) ||
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!table.ReadU32(&this->table.code_page_range_2)) {
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return Error("Failed to read ulCodePageRange1 or ulCodePageRange2");
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}
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if (this->table.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(OS2Data, max_context)) {
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Warning("Bad version number, setting it to 1: %u", this->table.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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this->table.version = 1;
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return true;
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}
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if (!table.ReadS16(&this->table.x_height) ||
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!table.ReadS16(&this->table.cap_height) ||
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!table.ReadU16(&this->table.default_char) ||
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!table.ReadU16(&this->table.break_char) ||
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!table.ReadU16(&this->table.max_context)) {
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return Error("Failed to read version 2-specific fields");
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}
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if (this->table.x_height < 0) {
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Warning("Bad sxHeight settig it to 0: %d", this->table.x_height);
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this->table.x_height = 0;
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}
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if (this->table.cap_height < 0) {
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Warning("Bad sCapHeight setting it to 0: %d", this->table.cap_height);
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this->table.cap_height = 0;
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}
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if (this->table.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(&this->table.lower_optical_pointsize) ||
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!table.ReadU16(&this->table.upper_optical_pointsize)) {
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return Error("Failed to read version 5-specific fields");
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}
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if (this->table.lower_optical_pointsize > 0xFFFE) {
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Warning("usLowerOpticalPointSize is bigger than 0xFFFE: %d",
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this->table.lower_optical_pointsize);
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this->table.lower_optical_pointsize = 0xFFFE;
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}
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if (this->table.upper_optical_pointsize < 2) {
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Warning("usUpperOpticalPointSize is lower than 2: %d",
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this->table.upper_optical_pointsize);
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this->table.upper_optical_pointsize = 2;
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}
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return true;
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}
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bool OpenTypeOS2::Serialize(OTSStream *out) {
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if (!out->WriteU16(this->table.version) ||
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!out->WriteS16(this->table.avg_char_width) ||
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!out->WriteU16(this->table.weight_class) ||
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!out->WriteU16(this->table.width_class) ||
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!out->WriteU16(this->table.type) ||
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!out->WriteS16(this->table.subscript_x_size) ||
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!out->WriteS16(this->table.subscript_y_size) ||
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!out->WriteS16(this->table.subscript_x_offset) ||
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!out->WriteS16(this->table.subscript_y_offset) ||
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!out->WriteS16(this->table.superscript_x_size) ||
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!out->WriteS16(this->table.superscript_y_size) ||
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!out->WriteS16(this->table.superscript_x_offset) ||
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!out->WriteS16(this->table.superscript_y_offset) ||
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!out->WriteS16(this->table.strikeout_size) ||
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!out->WriteS16(this->table.strikeout_position) ||
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!out->WriteS16(this->table.family_class)) {
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return Error("Failed to write basic table data");
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}
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for (unsigned i = 0; i < 10; ++i) {
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if (!out->Write(&this->table.panose[i], 1)) {
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return Error("Failed to write PANOSE data");
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}
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}
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if (!out->WriteU32(this->table.unicode_range_1) ||
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!out->WriteU32(this->table.unicode_range_2) ||
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!out->WriteU32(this->table.unicode_range_3) ||
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!out->WriteU32(this->table.unicode_range_4) ||
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!out->WriteU32(this->table.vendor_id) ||
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!out->WriteU16(this->table.selection) ||
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!out->WriteU16(this->table.first_char_index) ||
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!out->WriteU16(this->table.last_char_index) ||
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!out->WriteS16(this->table.typo_ascender) ||
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!out->WriteS16(this->table.typo_descender) ||
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!out->WriteS16(this->table.typo_linegap) ||
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!out->WriteU16(this->table.win_ascent) ||
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!out->WriteU16(this->table.win_descent)) {
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return Error("Failed to write version 1-specific fields");
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}
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if (this->table.version < 1) {
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return true;
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}
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if (!out->WriteU32(this->table.code_page_range_1) ||
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!out->WriteU32(this->table.code_page_range_2)) {
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return Error("Failed to write codepage ranges");
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}
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if (this->table.version < 2) {
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return true;
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}
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if (!out->WriteS16(this->table.x_height) ||
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!out->WriteS16(this->table.cap_height) ||
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!out->WriteU16(this->table.default_char) ||
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!out->WriteU16(this->table.break_char) ||
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!out->WriteU16(this->table.max_context)) {
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return Error("Failed to write version 2-specific fields");
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}
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if (this->table.version < 5) {
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return true;
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}
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if (!out->WriteU16(this->table.lower_optical_pointsize) ||
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!out->WriteU16(this->table.upper_optical_pointsize)) {
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return Error("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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} // namespace ots
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