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-rw-r--r--gfx/ots/src/os2.cc320
1 files changed, 320 insertions, 0 deletions
diff --git a/gfx/ots/src/os2.cc b/gfx/ots/src/os2.cc
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+++ b/gfx/ots/src/os2.cc
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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
+// http://www.microsoft.com/typography/otspec/os2.htm
+
+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) {
+ // http://www.microsoft.com/typography/otspec/os2ver0.htm
+ 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) {
+ // http://www.microsoft.com/typography/otspec/os2ver1.htm
+ 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) {
+ // http://www.microsoft.com/typography/otspec/os2ver4.htm
+ 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
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-08 03:40:26 +0000