From 36d22d82aa202bb199967e9512281e9a53db42c9 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 21:33:14 +0200 Subject: Adding upstream version 115.7.0esr. Signed-off-by: Daniel Baumann --- gfx/ots/src/os2.cc | 320 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 320 insertions(+) create mode 100644 gfx/ots/src/os2.cc (limited to 'gfx/ots/src/os2.cc') diff --git a/gfx/ots/src/os2.cc b/gfx/ots/src/os2.cc new file mode 100644 index 0000000000..5376a1dbb1 --- /dev/null +++ b/gfx/ots/src/os2.cc @@ -0,0 +1,320 @@ +// 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 + +#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( + 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 -- cgit v1.2.3