Updating OTS repo from https://github.com/khaledhosny/ots.git

third_party/ots/src/vorg.cc

+// Copyright (c) 2009 The Chromium 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
+
+#define TABLE_NAME "VORG"
+
+#define DROP_THIS_TABLE(...) \
+  do { \
+    OTS_FAILURE_MSG_(file, TABLE_NAME ": " __VA_ARGS__); \
+    OTS_FAILURE_MSG("Table discarded"); \
+    delete file->vorg; \
+    file->vorg = 0; \
+  } while (0)
+
+namespace ots {
+
+bool ots_vorg_parse(OpenTypeFile *file, const uint8_t *data, size_t length) {
+  Buffer table(data, length);
+  file->vorg = new OpenTypeVORG;
+  OpenTypeVORG * const vorg = file->vorg;
+
+  uint16_t num_recs;
+  if (!table.ReadU16(&vorg->major_version) ||
+      !table.ReadU16(&vorg->minor_version) ||
+      !table.ReadS16(&vorg->default_vert_origin_y) ||
+      !table.ReadU16(&num_recs)) {
+    return OTS_FAILURE_MSG("Failed to read header");
+  }
+  if (vorg->major_version != 1) {
+    DROP_THIS_TABLE("bad major version: %u", vorg->major_version);
+    return true;
+  }
+  if (vorg->minor_version != 0) {
+    DROP_THIS_TABLE("bad minor version: %u", vorg->minor_version);
+    return true;
+  }
+
+  // num_recs might be zero (e.g., DFHSMinchoPro5-W3-Demo.otf).
+  if (!num_recs) {
+    return true;
+  }
+
+  uint16_t last_glyph_index = 0;
+  vorg->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 OTS_FAILURE_MSG("Failed to read record %d", i);
+    }
+    if ((i != 0) && (rec.glyph_index <= last_glyph_index)) {
+      DROP_THIS_TABLE("the table is not sorted");
+      return true;
+    }
+    last_glyph_index = rec.glyph_index;
+
+    vorg->metrics.push_back(rec);
+  }
+
+  return true;
+}
+
+bool ots_vorg_should_serialise(OpenTypeFile *file) {
+  if (!file->cff) return false;  // this table is not for fonts with TT glyphs.
+  return file->vorg != NULL;
+}
+
+bool ots_vorg_serialise(OTSStream *out, OpenTypeFile *file) {
+  OpenTypeVORG * const vorg = file->vorg;
+  
+  const uint16_t num_metrics = static_cast<uint16_t>(vorg->metrics.size());
+  if (num_metrics != vorg->metrics.size() ||
+      !out->WriteU16(vorg->major_version) ||
+      !out->WriteU16(vorg->minor_version) ||
+      !out->WriteS16(vorg->default_vert_origin_y) ||
+      !out->WriteU16(num_metrics)) {
+    return OTS_FAILURE_MSG("Failed to write table header");
+  }
+
+  for (uint16_t i = 0; i < num_metrics; ++i) {
+    const OpenTypeVORGMetrics& rec = vorg->metrics[i];
+    if (!out->WriteU16(rec.glyph_index) ||
+        !out->WriteS16(rec.vert_origin_y)) {
+      return OTS_FAILURE_MSG("Failed to write record %d", i);
+    }
+  }
+
+  return true;
+}
+
+void ots_vorg_free(OpenTypeFile *file) {
+  delete file->vorg;
+}
+
+}  // namespace ots
+
+#undef TABLE_NAME
+#undef DROP_THIS_TABLE