Refactor fx_font part 2

core/fxge/include/cfx_unicodeencodingex.h

+// Copyright 2016 PDFium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
+
+#ifndef CORE_FXGE_INCLUDE_CFX_UNICODEENCODINGEX_H_
+#define CORE_FXGE_INCLUDE_CFX_UNICODEENCODINGEX_H_
+
+#include <map>
+#include <memory>
+#include <vector>
+
+#include "core/fxcrt/include/fx_system.h"
+#include "core/fxge/include/cfx_unicodeencoding.h"
+#include "core/fxge/include/fx_dib.h"
+#include "core/fxge/include/fx_freetype.h"
+
+class CFX_UnicodeEncodingEx : public CFX_UnicodeEncoding {
+ public:
+  CFX_UnicodeEncodingEx(CFX_Font* pFont, uint32_t EncodingID);
+  ~CFX_UnicodeEncodingEx() override;
+
+  // CFX_UnicodeEncoding:
+  uint32_t GlyphFromCharCode(uint32_t charcode) override;
+
+  uint32_t CharCodeFromUnicode(FX_WCHAR Unicode) const;
+
+ private:
+  uint32_t m_nEncodingID;
+};
+
+CFX_UnicodeEncodingEx* FX_CreateFontEncodingEx(
+    CFX_Font* pFont,
+    uint32_t nEncodingID = FXFM_ENCODING_NONE);
+
+#endif  // CORE_FXGE_INCLUDE_CFX_UNICODEENCODINGEX_H_