Adding upstream version 124.0.1.upstream/124.0.1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 320 insertions, 0 deletions

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 <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