Refactor fx_font part 2

core/fxge/ge/cfx_unicodeencoding.cpp

+// 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
+
+#include "core/fxge/include/cfx_unicodeencoding.h"
+
+#include "core/fxge/include/fx_font.h"
+#include "core/fxge/include/fx_freetype.h"
+
+CFX_UnicodeEncoding::CFX_UnicodeEncoding(CFX_Font* pFont) : m_pFont(pFont) {}
+
+CFX_UnicodeEncoding::~CFX_UnicodeEncoding() {}
+
+uint32_t CFX_UnicodeEncoding::GlyphFromCharCode(uint32_t charcode) {
+  FXFT_Face face = m_pFont->GetFace();
+  if (!face)
+    return charcode;
+
+  if (FXFT_Select_Charmap(face, FXFT_ENCODING_UNICODE) == 0)
+    return FXFT_Get_Char_Index(face, charcode);
+
+  if (m_pFont->GetSubstFont() &&
+      m_pFont->GetSubstFont()->m_Charset == FXFONT_SYMBOL_CHARSET) {
+    uint32_t index = 0;
+    if (FXFT_Select_Charmap(face, FXFT_ENCODING_MS_SYMBOL) == 0)
+      index = FXFT_Get_Char_Index(face, charcode);
+    if (!index && !FXFT_Select_Charmap(face, FXFT_ENCODING_APPLE_ROMAN))
+      return FXFT_Get_Char_Index(face, charcode);
+  }
+  return charcode;
+}