Create a representation for OpenType variation settings

third_party/WebKit/Source/platform/fonts/opentype/FontSettings.h

Index: third_party/WebKit/Source/platform/fonts/opentype/FontSettings.h
diff --git a/third_party/WebKit/Source/platform/fonts/opentype/FontSettings.h b/third_party/WebKit/Source/platform/fonts/opentype/FontSettings.h
new file mode 100644
index 0000000000000000000000000000000000000000..c64693529b1bb4b21b8454b0de5b1d1d08e60220
--- /dev/null
+++ b/third_party/WebKit/Source/platform/fonts/opentype/FontSettings.h
@@ -0,0 +1,90 @@
+// Copyright 2016 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.
+
+#ifndef FontSettings_h
+#define FontSettings_h
+
+#include "platform/PlatformExport.h"
+#include "wtf/Allocator.h"
+#include "wtf/PassRefPtr.h"
+#include "wtf/RefCounted.h"
+#include "wtf/RefPtr.h"
+#include "wtf/Vector.h"
+#include "wtf/text/AtomicString.h"
+
+namespace blink {
+
+template <typename T>
+class FontTagValuePair {
+  DISALLOW_NEW_EXCEPT_PLACEMENT_NEW();
+
+ public:
+  FontTagValuePair(const AtomicString& tag, T value)
+      : m_tag(tag), m_value(value){};
+  bool operator==(const FontTagValuePair& other) const {
+    return m_tag == other.m_tag && m_value == other.m_value;
+  };
+
+  const AtomicString& tag() const { return m_tag; }
+  T value() const { return m_value; }
+
+ private:
+  AtomicString m_tag;
+  const T m_value;
+};
+
+template <typename T>
+class FontSettings {
+  WTF_MAKE_NONCOPYABLE(FontSettings);
+
+ public:
+  void append(const T& feature) { m_list.append(feature); }
+  size_t size() const { return m_list.size(); }
+  const T& operator[](int index) const { return m_list[index]; }
+  const T& at(size_t index) const { return m_list.at(index); }
+  bool operator==(const FontSettings& other) const {
+    return m_list == other.m_list;
+  };
+
+ protected:
+  FontSettings(){};
+
+ private:
+  Vector<T> m_list;
+};
+
+using FontFeature = FontTagValuePair<int>;
+using FontVariationAxis = FontTagValuePair<float>;
+
+class PLATFORM_EXPORT FontFeatureSettings
+    : public FontSettings<FontFeature>,
+      public RefCounted<FontFeatureSettings> {
+  WTF_MAKE_NONCOPYABLE(FontFeatureSettings);
+
+ public:
+  static PassRefPtr<FontFeatureSettings> create() {
+    return adoptRef(new FontFeatureSettings);
+  }
+
+ private:
+  FontFeatureSettings() = default;
+};
+
+class PLATFORM_EXPORT FontVariationSettings
+    : public FontSettings<FontVariationAxis>,
+      public RefCounted<FontVariationSettings> {
+  WTF_MAKE_NONCOPYABLE(FontVariationSettings);
+
+ public:
+  static PassRefPtr<FontVariationSettings> create() {
+    return adoptRef(new FontVariationSettings());
+  };
+
+ private:
+  FontVariationSettings() = default;
+};
+
+}  // namespace blink
+
+#endif  // FontSettings_h