1 files changed, 65 insertions, 0 deletions
diff --git a/gfx/ots/src/layout.h b/gfx/ots/src/layout.h
new file mode 100644
index 0000000000..f0bc133e66
--- /dev/null
+++ b/gfx/ots/src/layout.h
@@ -0,0 +1,65 @@
+// Copyright (c) 2011-2017 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.
+
+#ifndef OTS_LAYOUT_H_
+#define OTS_LAYOUT_H_
+
+#include "ots.h"
+
+// Utility functions for OpenType layout common table formats.
+// http://www.microsoft.com/typography/otspec/chapter2.htm
+
+namespace ots {
+
+// The maximum number of class value.
+const uint16_t kMaxClassDefValue = 0xFFFF;
+
+class OpenTypeLayoutTable : public Table {
+  public:
+    explicit OpenTypeLayoutTable(Font *font, uint32_t tag, uint32_t type)
+      : Table(font, tag, type) { }
+
+    bool Parse(const uint8_t *data, size_t length);
+    bool Serialize(OTSStream *out);
+
+  protected:
+    bool ParseContextSubtable(const uint8_t *data, const size_t length);
+    bool ParseChainingContextSubtable(const uint8_t *data, const size_t length);
+    bool ParseExtensionSubtable(const uint8_t *data, const size_t length);
+
+  private:
+    bool ParseScriptListTable(const uint8_t *data, const size_t length);
+    bool ParseFeatureListTable(const uint8_t *data, const size_t length);
+    bool ParseLookupListTable(const uint8_t *data, const size_t length);
+    bool ParseFeatureVariationsTable(const uint8_t *data, const size_t length);
+    bool ParseLookupTable(const uint8_t *data, const size_t length);
+
+    virtual bool ValidLookupSubtableType(const uint16_t lookup_type,
+                                         bool extension = false) const = 0;
+    virtual bool ParseLookupSubtable(const uint8_t *data, const size_t length,
+                                     const uint16_t lookup_type) = 0;
+
+    const uint8_t *m_data = nullptr;
+    size_t m_length = 0;
+    uint16_t m_num_features = 0;
+    uint16_t m_num_lookups = 0;
+};
+
+bool ParseClassDefTable(const ots::Font *font,
+                        const uint8_t *data, size_t length,
+                        const uint16_t num_glyphs,
+                        const uint16_t num_classes);
+
+bool ParseCoverageTable(const ots::Font *font,
+                        const uint8_t *data, size_t length,
+                        const uint16_t num_glyphs,
+                        const uint16_t expected_num_glyphs = 0);
+
+bool ParseDeviceTable(const ots::Font *font,
+                      const uint8_t *data, size_t length);
+
+}  // namespace ots
+
+#endif  // OTS_LAYOUT_H_
+