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// Copyright (c) 2009-2017 The OTS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <string>
#include "os2.h"
#include "head.h"
// OS/2 - OS/2 and Windows Metrics
namespace ots {
bool OpenTypeOS2::Parse(const uint8_t *data, size_t length) {
Buffer table(data, length);
if (!table.ReadU16(&this->table.version) ||
!table.ReadS16(&this->table.avg_char_width) ||
!table.ReadU16(&this->table.weight_class) ||
!table.ReadU16(&this->table.width_class) ||
!table.ReadU16(&this->table.type) ||
!table.ReadS16(&this->table.subscript_x_size) ||
!table.ReadS16(&this->table.subscript_y_size) ||
!table.ReadS16(&this->table.subscript_x_offset) ||
!table.ReadS16(&this->table.subscript_y_offset) ||
!table.ReadS16(&this->table.superscript_x_size) ||
!table.ReadS16(&this->table.superscript_y_size) ||
!table.ReadS16(&this->table.superscript_x_offset) ||
!table.ReadS16(&this->table.superscript_y_offset) ||
!table.ReadS16(&this->table.strikeout_size) ||
!table.ReadS16(&this->table.strikeout_position) ||
!table.ReadS16(&this->table.family_class)) {
return Error("Error reading basic table elements");
}
if (this->table.version > 5) {
return Error("Unsupported table version: %u", this->table.version);
}
if (this->table.weight_class < 1) {
Warning("Bad usWeightClass: %u, changing it to %d",
this->table.weight_class, 1);
this->table.weight_class = 1;
} else if (this->table.weight_class > 1000) {
Warning("Bad usWeightClass: %u, changing it to %d",
this->table.weight_class, 1000);
this->table.weight_class = 1000;
}
if (this->table.width_class < 1) {
Warning("Bad usWidthClass: %u, changing it to %d",
this->table.width_class, 1);
this->table.width_class = 1;
} else if (this->table.width_class > 9) {
Warning("Bad usWidthClass: %u, changing it to %d",
this->table.width_class, 9);
this->table.width_class = 9;
}
// lowest 3 bits of fsType are exclusive.
if (this->table.type & 0x2) {
// mask bits 2 & 3.
this->table.type &= 0xfff3u;
} else if (this->table.type & 0x4) {
// mask bits 1 & 3.
this->table.type &= 0xfff4u;
} else if (this->table.type & 0x8) {
// mask bits 1 & 2.
this->table.type &= 0xfff9u;
}
// mask reserved bits. use only 0..3, 8, 9 bits.
this->table.type &= 0x30f;
#define SET_TO_ZERO(a, b) \
if (this->table.b < 0) { \
Warning("Bad " a ": %d, setting it to zero", this->table.b); \
this->table.b = 0; \
}
SET_TO_ZERO("ySubscriptXSize", subscript_x_size);
SET_TO_ZERO("ySubscriptYSize", subscript_y_size);
SET_TO_ZERO("ySuperscriptXSize", superscript_x_size);
SET_TO_ZERO("ySuperscriptYSize", superscript_y_size);
SET_TO_ZERO("yStrikeoutSize", strikeout_size);
#undef SET_TO_ZERO
static const char* panose_strings[10] = {
"bFamilyType",
"bSerifStyle",
"bWeight",
"bProportion",
"bContrast",
"bStrokeVariation",
"bArmStyle",
"bLetterform",
"bMidline",
"bXHeight",
};
for (unsigned i = 0; i < 10; ++i) {
if (!table.ReadU8(&this->table.panose[i])) {
return Error("Failed to read PANOSE %s", panose_strings[i]);
}
}
if (!table.ReadU32(&this->table.unicode_range_1) ||
!table.ReadU32(&this->table.unicode_range_2) ||
!table.ReadU32(&this->table.unicode_range_3) ||
!table.ReadU32(&this->table.unicode_range_4) ||
!table.ReadU32(&this->table.vendor_id) ||
!table.ReadU16(&this->table.selection) ||
!table.ReadU16(&this->table.first_char_index) ||
!table.ReadU16(&this->table.last_char_index) ||
!table.ReadS16(&this->table.typo_ascender) ||
!table.ReadS16(&this->table.typo_descender) ||
!table.ReadS16(&this->table.typo_linegap) ||
!table.ReadU16(&this->table.win_ascent) ||
!table.ReadU16(&this->table.win_descent)) {
return Error("Error reading more basic table fields");
}
// If bit 6 is set, then bits 0 and 5 must be clear.
if (this->table.selection & 0x40) {
this->table.selection &= 0xffdeu;
}
// the settings of bits 0 and 1 must be reflected in the macStyle bits
// in the 'head' table.
OpenTypeHEAD *head = static_cast<OpenTypeHEAD*>(
GetFont()->GetTypedTable(OTS_TAG_HEAD));
if ((this->table.selection & 0x1) &&
head && !(head->mac_style & 0x2)) {
Warning("Adjusting head.macStyle (italic) to match fsSelection");
head->mac_style |= 0x2;
}
if ((this->table.selection & 0x2) &&
head && !(head->mac_style & 0x4)) {
Warning("Adjusting head.macStyle (underscore) to match fsSelection");
head->mac_style |= 0x4;
}
// While bit 6 on implies that bits 0 and 1 of macStyle are clear,
// the reverse is not true.
if ((this->table.selection & 0x40) &&
head && (head->mac_style & 0x3)) {
Warning("Adjusting head.macStyle (regular) to match fsSelection");
head->mac_style &= 0xfffcu;
}
if ((this->table.version < 4) &&
(this->table.selection & 0x300)) {
// bit 8 and 9 must be unset in OS/2 table versions less than 4.
Warning("fsSelection bits 8 and 9 must be unset for table version %d",
this->table.version);
}
// mask reserved bits. use only 0..9 bits.
this->table.selection &= 0x3ff;
if (this->table.first_char_index > this->table.last_char_index) {
Warning("usFirstCharIndex %d > usLastCharIndex %d",
this->table.first_char_index, this->table.last_char_index);
this->table.first_char_index = this->table.last_char_index;
}
if (this->table.typo_linegap < 0) {
Warning("Bad sTypoLineGap, setting it to 0: %d", this->table.typo_linegap);
this->table.typo_linegap = 0;
}
if (this->table.version < 1) {
return true;
}
if (length < offsetof(OS2Data, code_page_range_2)) {
Warning("Bad version number, setting it to 0: %u", this->table.version);
// Some fonts (e.g., kredit1.ttf and quinquef.ttf) have weird version
// numbers. Fix them.
this->table.version = 0;
return true;
}
if (!table.ReadU32(&this->table.code_page_range_1) ||
!table.ReadU32(&this->table.code_page_range_2)) {
return Error("Failed to read ulCodePageRange1 or ulCodePageRange2");
}
if (this->table.version < 2) {
return true;
}
if (length < offsetof(OS2Data, max_context)) {
Warning("Bad version number, setting it to 1: %u", this->table.version);
// some Japanese fonts (e.g., mona.ttf) have weird version number.
// fix them.
this->table.version = 1;
return true;
}
if (!table.ReadS16(&this->table.x_height) ||
!table.ReadS16(&this->table.cap_height) ||
!table.ReadU16(&this->table.default_char) ||
!table.ReadU16(&this->table.break_char) ||
!table.ReadU16(&this->table.max_context)) {
return Error("Failed to read version 2-specific fields");
}
if (this->table.x_height < 0) {
Warning("Bad sxHeight settig it to 0: %d", this->table.x_height);
this->table.x_height = 0;
}
if (this->table.cap_height < 0) {
Warning("Bad sCapHeight setting it to 0: %d", this->table.cap_height);
this->table.cap_height = 0;
}
if (this->table.version < 5) {
return true;
}
if (!table.ReadU16(&this->table.lower_optical_pointsize) ||
!table.ReadU16(&this->table.upper_optical_pointsize)) {
return Error("Failed to read version 5-specific fields");
}
if (this->table.lower_optical_pointsize > 0xFFFE) {
Warning("usLowerOpticalPointSize is bigger than 0xFFFE: %d",
this->table.lower_optical_pointsize);
this->table.lower_optical_pointsize = 0xFFFE;
}
if (this->table.upper_optical_pointsize < 2) {
Warning("usUpperOpticalPointSize is lower than 2: %d",
this->table.upper_optical_pointsize);
this->table.upper_optical_pointsize = 2;
}
return true;
}
bool OpenTypeOS2::Serialize(OTSStream *out) {
if (!out->WriteU16(this->table.version) ||
!out->WriteS16(this->table.avg_char_width) ||
!out->WriteU16(this->table.weight_class) ||
!out->WriteU16(this->table.width_class) ||
!out->WriteU16(this->table.type) ||
!out->WriteS16(this->table.subscript_x_size) ||
!out->WriteS16(this->table.subscript_y_size) ||
!out->WriteS16(this->table.subscript_x_offset) ||
!out->WriteS16(this->table.subscript_y_offset) ||
!out->WriteS16(this->table.superscript_x_size) ||
!out->WriteS16(this->table.superscript_y_size) ||
!out->WriteS16(this->table.superscript_x_offset) ||
!out->WriteS16(this->table.superscript_y_offset) ||
!out->WriteS16(this->table.strikeout_size) ||
!out->WriteS16(this->table.strikeout_position) ||
!out->WriteS16(this->table.family_class)) {
return Error("Failed to write basic table data");
}
for (unsigned i = 0; i < 10; ++i) {
if (!out->Write(&this->table.panose[i], 1)) {
return Error("Failed to write PANOSE data");
}
}
if (!out->WriteU32(this->table.unicode_range_1) ||
!out->WriteU32(this->table.unicode_range_2) ||
!out->WriteU32(this->table.unicode_range_3) ||
!out->WriteU32(this->table.unicode_range_4) ||
!out->WriteU32(this->table.vendor_id) ||
!out->WriteU16(this->table.selection) ||
!out->WriteU16(this->table.first_char_index) ||
!out->WriteU16(this->table.last_char_index) ||
!out->WriteS16(this->table.typo_ascender) ||
!out->WriteS16(this->table.typo_descender) ||
!out->WriteS16(this->table.typo_linegap) ||
!out->WriteU16(this->table.win_ascent) ||
!out->WriteU16(this->table.win_descent)) {
return Error("Failed to write version 1-specific fields");
}
if (this->table.version < 1) {
return true;
}
if (!out->WriteU32(this->table.code_page_range_1) ||
!out->WriteU32(this->table.code_page_range_2)) {
return Error("Failed to write codepage ranges");
}
if (this->table.version < 2) {
return true;
}
if (!out->WriteS16(this->table.x_height) ||
!out->WriteS16(this->table.cap_height) ||
!out->WriteU16(this->table.default_char) ||
!out->WriteU16(this->table.break_char) ||
!out->WriteU16(this->table.max_context)) {
return Error("Failed to write version 2-specific fields");
}
if (this->table.version < 5) {
return true;
}
if (!out->WriteU16(this->table.lower_optical_pointsize) ||
!out->WriteU16(this->table.upper_optical_pointsize)) {
return Error("Failed to write version 5-specific fields");
}
return true;
}
} // namespace ots