Don't use LCD antialiasing if Fontconfig doesn't support hinting

core/fxge/include/fx_font.h

 // 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
 
 #ifndef CORE_FXGE_INCLUDE_FX_FONT_H_
 #define CORE_FXGE_INCLUDE_FX_FONT_H_
 
 #include <map>
@@ skipping 262 matching lines @@
   FXFT_Face FindSubstFont(const CFX_ByteString& face_name,
                           FX_BOOL bTrueType,
                           uint32_t flags,
                           int weight,
                           int italic_angle,
                           int CharsetCP,
                           CFX_SubstFont* pSubstFont);
   bool GetBuiltinFont(size_t index, const uint8_t** pFontData, uint32_t* size);
   CFX_FontMapper* GetBuiltinMapper() const { return m_pBuiltinMapper.get(); }
   FXFT_Library GetFTLibrary() const { return m_FTLibrary; }
+  bool FTLibrarySupportsHinting() const { return m_FTLibrarySupportsHinting; }
 
  private:
   std::unique_ptr<CFX_FontMapper> m_pBuiltinMapper;
   std::map<CFX_ByteString, CTTFontDesc*> m_FaceMap;
   FXFT_Library m_FTLibrary;
+  bool m_FTLibrarySupportsHinting;
 };
 
 class CFX_FontMapper {
  public:
   explicit CFX_FontMapper(CFX_FontMgr* mgr);
   ~CFX_FontMapper();
 
   void SetSystemFontInfo(IFX_SystemFontInfo* pFontInfo);
   IFX_SystemFontInfo* GetSystemFontInfo() { return m_pFontInfo; }
   void AddInstalledFont(const CFX_ByteString& name, int charset);
@@ skipping 234 matching lines @@
                            FX_FLOAT retinaScaleX = 1.0f,
                            FX_FLOAT retinaScaleY = 1.0f);
 
 CFX_ByteString GetNameFromTT(const uint8_t* name_table,
                              uint32_t name_table_size,
                              uint32_t name);
 
 int PDF_GetStandardFontName(CFX_ByteString* name);
 
 #endif  // CORE_FXGE_INCLUDE_FX_FONT_H_