1 files changed, 83 insertions, 0 deletions
diff --git a/gfx/ots/src/vorg.cc b/gfx/ots/src/vorg.cc
new file mode 100644
index 0000000000..3b4b51c533
--- /dev/null
+++ b/gfx/ots/src/vorg.cc
@@ -0,0 +1,83 @@
+// 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 "vorg.h"
+
+#include <vector>
+
+// VORG - Vertical Origin Table
+// http://www.microsoft.com/typography/otspec/vorg.htm
+
+namespace ots {
+
+bool OpenTypeVORG::Parse(const uint8_t *data, size_t length) {
+  Buffer table(data, length);
+
+  uint16_t num_recs;
+  if (!table.ReadU16(&this->major_version) ||
+      !table.ReadU16(&this->minor_version) ||
+      !table.ReadS16(&this->default_vert_origin_y) ||
+      !table.ReadU16(&num_recs)) {
+    return Error("Failed to read header");
+  }
+  if (this->major_version != 1) {
+    return Drop("Unsupported majorVersion: %u", this->major_version);
+  }
+  if (this->minor_version != 0) {
+    return Drop("Unsupported minorVersion: %u", this->minor_version);
+  }
+
+  // num_recs might be zero (e.g., DFHSMinchoPro5-W3-Demo.otf).
+  if (!num_recs) {
+    return true;
+  }
+
+  uint16_t last_glyph_index = 0;
+  this->metrics.reserve(num_recs);
+  for (unsigned i = 0; i < num_recs; ++i) {
+    OpenTypeVORGMetrics rec;
+
+    if (!table.ReadU16(&rec.glyph_index) ||
+        !table.ReadS16(&rec.vert_origin_y)) {
+      return Error("Failed to read record %d", i);
+    }
+    if ((i != 0) && (rec.glyph_index <= last_glyph_index)) {
+      return Drop("The table is not sorted");
+    }
+    last_glyph_index = rec.glyph_index;
+
+    this->metrics.push_back(rec);
+  }
+
+  return true;
+}
+
+bool OpenTypeVORG::Serialize(OTSStream *out) {
+  const uint16_t num_metrics = static_cast<uint16_t>(this->metrics.size());
+  if (num_metrics != this->metrics.size() ||
+      !out->WriteU16(this->major_version) ||
+      !out->WriteU16(this->minor_version) ||
+      !out->WriteS16(this->default_vert_origin_y) ||
+      !out->WriteU16(num_metrics)) {
+    return Error("Failed to write table header");
+  }
+
+  for (uint16_t i = 0; i < num_metrics; ++i) {
+    const OpenTypeVORGMetrics& rec = this->metrics[i];
+    if (!out->WriteU16(rec.glyph_index) ||
+        !out->WriteS16(rec.vert_origin_y)) {
+      return Error("Failed to write record %d", i);
+    }
+  }
+
+  return true;
+}
+
+bool OpenTypeVORG::ShouldSerialize() {
+  return Table::ShouldSerialize() &&
+         // this table is not for fonts with TT glyphs.
+         GetFont()->GetTable(OTS_TAG_CFF) != NULL;
+}
+
+}  // namespace ots