Use FXFONT defines in place of integers.

core/fxge/ge/fx_ge_font.cpp

 // Copyright 2014 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/fx_font.h"
 
 #include "core/fpdfapi/fpdf_font/include/cpdf_font.h"
 #include "core/fxge/ge/fx_text_int.h"
@@ skipping 438 matching lines @@
 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 == 2) {
+  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;
 }
 
 #ifdef PDF_ENABLE_XFA
@@ skipping 60 matching lines @@
   for (size_t i = 0; i < FX_ArraySize(g_EncodingID); ++i) {
     CFX_UnicodeEncodingEx* pFontEncoding =
         _FXFM_CreateFontEncoding(pFont, g_EncodingID[i]);
     if (pFontEncoding) {
       return pFontEncoding;
     }
   }
   return nullptr;
 }
 #endif  // PDF_ENABLE_XFA