Remove IFGAS_FontMgr and clean up (the renamed) CFGAS_FontMgr a little.

IFGAS_FontMgr is an interface only for a class only defined on Windows,
plus a class only defined for non-Windows. I'm removing the interface,
renaming the class to have the same name in both cases, and cleaning up
a bit of unused methods.

Review-Url: https://codereview.chromium.org/2494883002

1 files changed, 1282 insertions, 0 deletions

diff --git a/xfa/fgas/font/cfgas_fontmgr.cpp b/xfa/fgas/font/cfgas_fontmgr.cpp
new file mode 100644
index 0000000000..460acf801b
--- /dev/null
+++ b/xfa/fgas/font/cfgas_fontmgr.cpp
@@ -0,0 +1,1282 @@
+// Copyright 2015 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 "xfa/fgas/font/cfgas_fontmgr.h"
+
+#include "core/fxcrt/fx_stream.h"
+#include "core/fxge/cfx_fontmapper.h"
+#include "core/fxge/cfx_fontmgr.h"
+#include "core/fxge/cfx_gemodule.h"
+#include "core/fxge/ifx_systemfontinfo.h"
+#include "third_party/base/ptr_util.h"
+#include "xfa/fgas/crt/fgas_codepage.h"
+#include "xfa/fgas/font/fgas_fontutils.h"
+#include "xfa/fgas/font/fgas_gefont.h"
+
+#if _FXM_PLATFORM_ == _FXM_PLATFORM_WINDOWS_
+
+namespace {
+
+int32_t GetSimilarityScore(FX_FONTDESCRIPTOR const* pFont,
+                           uint32_t dwFontStyles) {
+  int32_t iValue = 0;
+  if ((dwFontStyles & FX_FONTSTYLE_Symbolic) ==
+      (pFont->dwFontStyles & FX_FONTSTYLE_Symbolic)) {
+    iValue += 64;
+  }
+  if ((dwFontStyles & FX_FONTSTYLE_FixedPitch) ==
+      (pFont->dwFontStyles & FX_FONTSTYLE_FixedPitch)) {
+    iValue += 32;
+  }
+  if ((dwFontStyles & FX_FONTSTYLE_Serif) ==
+      (pFont->dwFontStyles & FX_FONTSTYLE_Serif)) {
+    iValue += 16;
+  }
+  if ((dwFontStyles & FX_FONTSTYLE_Script) ==
+      (pFont->dwFontStyles & FX_FONTSTYLE_Script)) {
+    iValue += 8;
+  }
+  return iValue;
+}
+
+FX_FONTDESCRIPTOR const* MatchDefaultFont(FX_LPFONTMATCHPARAMS pParams,
+                                          const CFX_FontDescriptors& fonts) {
+  FX_FONTDESCRIPTOR const* pBestFont = nullptr;
+  int32_t iBestSimilar = 0;
+  bool bMatchStyle = (pParams->dwMatchFlags & FX_FONTMATCHPARA_MatchStyle) > 0;
+  for (int32_t i = 0; i < fonts.GetSize(); ++i) {
+    FX_FONTDESCRIPTOR const* pFont = fonts.GetPtrAt(i);
+    if ((pFont->dwFontStyles & FX_FONTSTYLE_BoldItalic) ==
+        FX_FONTSTYLE_BoldItalic) {
+      continue;
+    }
+    if (pParams->pwsFamily) {
+      if (FXSYS_wcsicmp(pParams->pwsFamily, pFont->wsFontFace))
+        continue;
+      if (pFont->uCharSet == FX_CHARSET_Symbol)
+        return pFont;
+    }
+    if (pFont->uCharSet == FX_CHARSET_Symbol)
+      continue;
+    if (pParams->wCodePage != 0xFFFF) {
+      if (FX_GetCodePageFromCharset(pFont->uCharSet) != pParams->wCodePage)
+        continue;
+    } else {
+      if (pParams->dwUSB < 128) {
+        uint32_t dwByte = pParams->dwUSB / 32;
+        uint32_t dwUSB = 1 << (pParams->dwUSB % 32);
+        if ((pFont->FontSignature.fsUsb[dwByte] & dwUSB) == 0)
+          continue;
+      }
+    }
+    if (bMatchStyle) {
+      if ((pFont->dwFontStyles & 0x0F) == (pParams->dwFontStyles & 0x0F))
+        return pFont;
+      continue;
+    }
+    if (pParams->pwsFamily) {
+      if (FXSYS_wcsicmp(pParams->pwsFamily, pFont->wsFontFace) == 0)
+        return pFont;
+    }
+    int32_t iSimilarValue = GetSimilarityScore(pFont, pParams->dwFontStyles);
+    if (iBestSimilar < iSimilarValue) {
+      iBestSimilar = iSimilarValue;
+      pBestFont = pFont;
+    }
+  }
+  return iBestSimilar < 1 ? nullptr : pBestFont;
+}
+
+}  // namespace
+
+std::unique_ptr<CFGAS_FontMgr> CFGAS_FontMgr::Create(
+    FX_LPEnumAllFonts pEnumerator) {
+  return pdfium::MakeUnique<CFGAS_FontMgr>(pEnumerator);
+}
+
+CFGAS_FontMgr::CFGAS_FontMgr(FX_LPEnumAllFonts pEnumerator)
+    : m_pEnumerator(pEnumerator),
+      m_FontFaces(100),
+      m_CPFonts(8),
+      m_FamilyFonts(16),
+      m_UnicodeFonts(16),
+      m_BufferFonts(4),
+      m_StreamFonts(4),
+      m_DeriveFonts(4) {
+  if (m_pEnumerator)
+    m_pEnumerator(m_FontFaces, nullptr, 0xFEFF);
+}
+
+CFGAS_FontMgr::~CFGAS_FontMgr() {
+  m_FontFaces.RemoveAll(false);
+  m_CPFonts.RemoveAll();
+  m_FamilyFonts.RemoveAll();
+  m_UnicodeFonts.RemoveAll();
+  m_BufferFonts.RemoveAll();
+  m_StreamFonts.RemoveAll();
+  m_DeriveFonts.RemoveAll();
+  for (int32_t i = m_Fonts.GetUpperBound(); i >= 0; i--)
+    m_Fonts[i]->Release();
+}
+
+CFGAS_GEFont* CFGAS_FontMgr::GetDefFontByCodePage(
+    uint16_t wCodePage,
+    uint32_t dwFontStyles,
+    const FX_WCHAR* pszFontFamily) {
+  uint32_t dwHash = FGAS_GetFontHashCode(wCodePage, dwFontStyles);
+  CFGAS_GEFont* pFont = nullptr;
+  if (m_CPFonts.Lookup((void*)(uintptr_t)dwHash, (void*&)pFont))
+    return pFont ? LoadFont(pFont, dwFontStyles, wCodePage) : nullptr;
+  FX_FONTDESCRIPTOR const* pFD =
+      FindFont(pszFontFamily, dwFontStyles, true, wCodePage);
+  if (!pFD)
+    pFD = FindFont(nullptr, dwFontStyles, true, wCodePage);
+  if (!pFD)
+    pFD = FindFont(nullptr, dwFontStyles, false, wCodePage);
+  if (!pFD)
+    return nullptr;
+
+  pFont =
+      CFGAS_GEFont::LoadFont(pFD->wsFontFace, dwFontStyles, wCodePage, this);
+  if (pFont) {
+    m_Fonts.Add(pFont);
+    m_CPFonts.SetAt((void*)(uintptr_t)dwHash, (void*)pFont);
+    dwHash = FGAS_GetFontFamilyHash(pFD->wsFontFace, dwFontStyles, wCodePage);
+    m_FamilyFonts.SetAt((void*)(uintptr_t)dwHash, (void*)pFont);
+    return LoadFont(pFont, dwFontStyles, wCodePage);
+  }
+  return nullptr;
+}
+
+CFGAS_GEFont* CFGAS_FontMgr::GetDefFontByUnicode(
+    FX_WCHAR wUnicode,
+    uint32_t dwFontStyles,
+    const FX_WCHAR* pszFontFamily) {
+  const FGAS_FONTUSB* pRet = FGAS_GetUnicodeBitField(wUnicode);
+  if (pRet->wBitField == 999)
+    return nullptr;
+
+  uint32_t dwHash =
+      FGAS_GetFontFamilyHash(pszFontFamily, dwFontStyles, pRet->wBitField);
+  CFGAS_GEFont* pFont = nullptr;
+  if (m_UnicodeFonts.Lookup((void*)(uintptr_t)dwHash, (void*&)pFont))
+    return pFont ? LoadFont(pFont, dwFontStyles, pRet->wCodePage) : nullptr;
+
+  FX_FONTDESCRIPTOR const* pFD =
+      FindFont(pszFontFamily, dwFontStyles, false, pRet->wCodePage,
+               pRet->wBitField, wUnicode);
+  if (!pFD && pszFontFamily) {
+    pFD = FindFont(nullptr, dwFontStyles, false, pRet->wCodePage,
+                   pRet->wBitField, wUnicode);
+  }
+  if (!pFD)
+    return nullptr;
+
+  uint16_t wCodePage = FX_GetCodePageFromCharset(pFD->uCharSet);
+  const FX_WCHAR* pFontFace = pFD->wsFontFace;
+  pFont = CFGAS_GEFont::LoadFont(pFontFace, dwFontStyles, wCodePage, this);
+  if (pFont) {
+    m_Fonts.Add(pFont);
+    m_UnicodeFonts.SetAt((void*)(uintptr_t)dwHash, (void*)pFont);
+    dwHash = FGAS_GetFontHashCode(wCodePage, dwFontStyles);
+    m_CPFonts.SetAt((void*)(uintptr_t)dwHash, (void*)pFont);
+    dwHash = FGAS_GetFontFamilyHash(pFontFace, dwFontStyles, wCodePage);
+    m_FamilyFonts.SetAt((void*)(uintptr_t)dwHash, (void*)pFont);
+    return LoadFont(pFont, dwFontStyles, wCodePage);
+  }
+  return nullptr;
+}
+
+CFGAS_GEFont* CFGAS_FontMgr::LoadFont(const FX_WCHAR* pszFontFamily,
+                                      uint32_t dwFontStyles,
+                                      uint16_t wCodePage) {
+  uint32_t dwHash =
+      FGAS_GetFontFamilyHash(pszFontFamily, dwFontStyles, wCodePage);
+  CFGAS_GEFont* pFont = nullptr;
+  if (m_FamilyFonts.Lookup((void*)(uintptr_t)dwHash, (void*&)pFont))
+    return pFont ? LoadFont(pFont, dwFontStyles, wCodePage) : nullptr;
+  FX_FONTDESCRIPTOR const* pFD =
+      FindFont(pszFontFamily, dwFontStyles, true, wCodePage);
+  if (!pFD)
+    pFD = FindFont(pszFontFamily, dwFontStyles, false, wCodePage);
+  if (!pFD)
+    return nullptr;
+
+  if (wCodePage == 0xFFFF)
+    wCodePage = FX_GetCodePageFromCharset(pFD->uCharSet);
+  pFont =
+      CFGAS_GEFont::LoadFont(pFD->wsFontFace, dwFontStyles, wCodePage, this);
+  if (pFont) {
+    m_Fonts.Add(pFont);
+    m_FamilyFonts.SetAt((void*)(uintptr_t)dwHash, (void*)pFont);
+    dwHash = FGAS_GetFontHashCode(wCodePage, dwFontStyles);
+    m_CPFonts.SetAt((void*)(uintptr_t)dwHash, (void*)pFont);
+    return LoadFont(pFont, dwFontStyles, wCodePage);
+  }
+  return nullptr;
+}
+
+CFGAS_GEFont* CFGAS_FontMgr::LoadFont(const uint8_t* pBuffer, int32_t iLength) {
+  ASSERT(pBuffer && iLength > 0);
+  CFGAS_GEFont* pFont = nullptr;
+  if (m_BufferFonts.Lookup((void*)pBuffer, (void*&)pFont)) {
+    if (pFont)
+      return pFont->Retain();
+  }
+  pFont = CFGAS_GEFont::LoadFont(pBuffer, iLength, this);
+  if (pFont) {
+    m_Fonts.Add(pFont);
+    m_BufferFonts.SetAt((void*)pBuffer, pFont);
+    return pFont->Retain();
+  }
+  return nullptr;
+}
+
+CFGAS_GEFont* CFGAS_FontMgr::LoadFont(IFX_Stream* pFontStream,
+                                      const FX_WCHAR* pszFontAlias,
+                                      uint32_t dwFontStyles,
+                                      uint16_t wCodePage,
+                                      bool bSaveStream) {
+  ASSERT(pFontStream && pFontStream->GetLength() > 0);
+  CFGAS_GEFont* pFont = nullptr;
+  if (m_StreamFonts.Lookup((void*)pFontStream, (void*&)pFont)) {
+    if (pFont) {
+      if (pszFontAlias) {
+        uint32_t dwHash =
+            FGAS_GetFontFamilyHash(pszFontAlias, dwFontStyles, wCodePage);
+        m_FamilyFonts.SetAt((void*)(uintptr_t)dwHash, (void*)pFont);
+      }
+      return LoadFont(pFont, dwFontStyles, wCodePage);
+    }
+  }
+  pFont = CFGAS_GEFont::LoadFont(pFontStream, this, bSaveStream);
+  if (pFont) {
+    m_Fonts.Add(pFont);
+    m_StreamFonts.SetAt((void*)pFontStream, (void*)pFont);
+    if (pszFontAlias) {
+      uint32_t dwHash =
+          FGAS_GetFontFamilyHash(pszFontAlias, dwFontStyles, wCodePage);
+      m_FamilyFonts.SetAt((void*)(uintptr_t)dwHash, (void*)pFont);
+    }
+    return LoadFont(pFont, dwFontStyles, wCodePage);
+  }
+  return nullptr;
+}
+
+CFGAS_GEFont* CFGAS_FontMgr::LoadFont(CFGAS_GEFont* pSrcFont,
+                                      uint32_t dwFontStyles,
+                                      uint16_t wCodePage) {
+  ASSERT(pSrcFont);
+  if (pSrcFont->GetFontStyles() == dwFontStyles)
+    return pSrcFont->Retain();
+  void* buffer[3] = {pSrcFont, (void*)(uintptr_t)dwFontStyles,
+                     (void*)(uintptr_t)wCodePage};
+  uint32_t dwHash = FX_HashCode_GetA(
+      CFX_ByteStringC((uint8_t*)buffer, sizeof(buffer)), false);
+  CFGAS_GEFont* pFont = nullptr;
+  if (m_DeriveFonts.GetCount() > 0) {
+    m_DeriveFonts.Lookup((void*)(uintptr_t)dwHash, (void*&)pFont);
+    if (pFont)
+      return pFont->Retain();
+  }
+  pFont = pSrcFont->Derive(dwFontStyles, wCodePage);
+  if (pFont) {
+    m_DeriveFonts.SetAt((void*)(uintptr_t)dwHash, (void*)pFont);
+    int32_t index = m_Fonts.Find(pFont);
+    if (index < 0) {
+      m_Fonts.Add(pFont);
+      pFont->Retain();
+    }
+    return pFont;
+  }
+  return nullptr;
+}
+
+void CFGAS_FontMgr::ClearFontCache() {
+  for (int32_t i = 0; i < m_Fonts.GetSize(); i++)
+    m_Fonts[i]->Reset();
+}
+
+void CFGAS_FontMgr::RemoveFont(CFX_MapPtrToPtr& fontMap, CFGAS_GEFont* pFont) {
+  FX_POSITION pos = fontMap.GetStartPosition();
+  void* pKey;
+  void* pFind;
+  while (pos) {
+    pFind = nullptr;
+    fontMap.GetNextAssoc(pos, pKey, pFind);
+    if (pFind != (void*)pFont)
+      continue;
+    fontMap.RemoveKey(pKey);
+    break;
+  }
+}
+
+void CFGAS_FontMgr::RemoveFont(CFGAS_GEFont* pFont) {
+  RemoveFont(m_CPFonts, pFont);
+  RemoveFont(m_FamilyFonts, pFont);
+  RemoveFont(m_UnicodeFonts, pFont);
+  RemoveFont(m_BufferFonts, pFont);
+  RemoveFont(m_StreamFonts, pFont);
+  RemoveFont(m_DeriveFonts, pFont);
+  int32_t iFind = m_Fonts.Find(pFont);
+  if (iFind > -1)
+    m_Fonts.RemoveAt(iFind, 1);
+}
+
+FX_FONTDESCRIPTOR const* CFGAS_FontMgr::FindFont(const FX_WCHAR* pszFontFamily,
+                                                 uint32_t dwFontStyles,
+                                                 uint32_t dwMatchFlags,
+                                                 uint16_t wCodePage,
+                                                 uint32_t dwUSB,
+                                                 FX_WCHAR wUnicode) {
+  FX_FONTMATCHPARAMS params;
+  FXSYS_memset(&params, 0, sizeof(params));
+  params.dwUSB = dwUSB;
+  params.wUnicode = wUnicode;
+  params.wCodePage = wCodePage;
+  params.pwsFamily = pszFontFamily;
+  params.dwFontStyles = dwFontStyles;
+  params.dwMatchFlags = dwMatchFlags;
+  FX_FONTDESCRIPTOR const* pDesc = MatchDefaultFont(&params, m_FontFaces);
+  if (pDesc)
+    return pDesc;
+  if (pszFontFamily && m_pEnumerator) {
+    CFX_FontDescriptors namedFonts(100);
+    m_pEnumerator(namedFonts, pszFontFamily, wUnicode);
+    params.pwsFamily = nullptr;
+    pDesc = MatchDefaultFont(&params, namedFonts);
+    if (!pDesc)
+      return nullptr;
+    for (int32_t i = m_FontFaces.GetSize() - 1; i >= 0; i--) {
+      FX_FONTDESCRIPTOR const* pMatch = m_FontFaces.GetPtrAt(i);
+      if (*pMatch == *pDesc)
+        return pMatch;
+    }
+    int index = m_FontFaces.Add(*pDesc);
+    return m_FontFaces.GetPtrAt(index);
+  }
+  return nullptr;
+}
+
+uint32_t FX_GetGdiFontStyles(const LOGFONTW& lf) {
+  uint32_t dwStyles = 0;
+  if ((lf.lfPitchAndFamily & 0x03) == FIXED_PITCH)
+    dwStyles |= FX_FONTSTYLE_FixedPitch;
+  uint8_t nFamilies = lf.lfPitchAndFamily & 0xF0;
+  if (nFamilies == FF_ROMAN)
+    dwStyles |= FX_FONTSTYLE_Serif;
+  if (nFamilies == FF_SCRIPT)
+    dwStyles |= FX_FONTSTYLE_Script;
+  if (lf.lfCharSet == SYMBOL_CHARSET)
+    dwStyles |= FX_FONTSTYLE_Symbolic;
+  return dwStyles;
+}
+
+static int32_t CALLBACK FX_GdiFontEnumProc(ENUMLOGFONTEX* lpelfe,
+                                           NEWTEXTMETRICEX* lpntme,
+                                           DWORD dwFontType,
+                                           LPARAM lParam) {
+  if (dwFontType != TRUETYPE_FONTTYPE)
+    return 1;
+  const LOGFONTW& lf = ((LPENUMLOGFONTEXW)lpelfe)->elfLogFont;
+  if (lf.lfFaceName[0] == L'@')
+    return 1;
+  FX_FONTDESCRIPTOR* pFont = FX_Alloc(FX_FONTDESCRIPTOR, 1);
+  FXSYS_memset(pFont, 0, sizeof(FX_FONTDESCRIPTOR));
+  pFont->uCharSet = lf.lfCharSet;
+  pFont->dwFontStyles = FX_GetGdiFontStyles(lf);
+  FXSYS_wcsncpy(pFont->wsFontFace, (const FX_WCHAR*)lf.lfFaceName, 31);
+  pFont->wsFontFace[31] = 0;
+  FXSYS_memcpy(&pFont->FontSignature, &lpntme->ntmFontSig,
+               sizeof(lpntme->ntmFontSig));
+  ((CFX_FontDescriptors*)lParam)->Add(*pFont);
+  FX_Free(pFont);
+  return 1;
+}
+
+static void FX_EnumGdiFonts(CFX_FontDescriptors& fonts,
+                            const FX_WCHAR* pwsFaceName,
+                            FX_WCHAR wUnicode) {
+  HDC hDC = ::GetDC(nullptr);
+  LOGFONTW lfFind;
+  FXSYS_memset(&lfFind, 0, sizeof(lfFind));
+  lfFind.lfCharSet = DEFAULT_CHARSET;
+  if (pwsFaceName) {
+    FXSYS_wcsncpy(lfFind.lfFaceName, pwsFaceName, 31);
+    lfFind.lfFaceName[31] = 0;
+  }
+  EnumFontFamiliesExW(hDC, (LPLOGFONTW)&lfFind,
+                      (FONTENUMPROCW)FX_GdiFontEnumProc, (LPARAM)&fonts, 0);
+  ::ReleaseDC(nullptr, hDC);
+}
+
+FX_LPEnumAllFonts FX_GetDefFontEnumerator() {
+  return FX_EnumGdiFonts;
+}
+
+#else  // _FXM_PLATFORM_ == _FXM_PLATFORM_WINDOWS_
+
+namespace {
+
+const FX_CHAR* g_FontFolders[] = {
+#if _FXM_PLATFORM_ == _FXM_PLATFORM_LINUX_
+    "/usr/share/fonts", "/usr/share/X11/fonts/Type1",
+    "/usr/share/X11/fonts/TTF", "/usr/local/share/fonts",
+#elif _FXM_PLATFORM_ == _FXM_PLATFORM_APPLE_
+    "~/Library/Fonts", "/Library/Fonts", "/System/Library/Fonts",
+#elif _FXM_PLATFORM_ == _FXM_PLATFORM_ANDROID_
+    "/system/fonts",
+#endif
+};
+
+struct FX_BitCodePage {
+  uint16_t wBit;
+  uint16_t wCodePage;
+};
+
+const FX_BitCodePage g_Bit2CodePage[] = {
+    {0, 1252}, {1, 1250}, {2, 1251}, {3, 1253},  {4, 1254}, {5, 1255},
+    {6, 1256}, {7, 1257}, {8, 1258}, {9, 0},     {10, 0},   {11, 0},
+    {12, 0},   {13, 0},   {14, 0},   {15, 0},    {16, 874}, {17, 932},
+    {18, 936}, {19, 949}, {20, 950}, {21, 1361}, {22, 0},   {23, 0},
+    {24, 0},   {25, 0},   {26, 0},   {27, 0},    {28, 0},   {29, 0},
+    {30, 0},   {31, 0},   {32, 0},   {33, 0},    {34, 0},   {35, 0},
+    {36, 0},   {37, 0},   {38, 0},   {39, 0},    {40, 0},   {41, 0},
+    {42, 0},   {43, 0},   {44, 0},   {45, 0},    {46, 0},   {47, 0},
+    {48, 869}, {49, 866}, {50, 865}, {51, 864},  {52, 863}, {53, 862},
+    {54, 861}, {55, 860}, {56, 857}, {57, 855},  {58, 852}, {59, 775},
+    {60, 737}, {61, 708}, {62, 850}, {63, 437},
+};
+
+uint16_t FX_GetCodePageBit(uint16_t wCodePage) {
+  for (size_t i = 0; i < FX_ArraySize(g_Bit2CodePage); ++i) {
+    if (g_Bit2CodePage[i].wCodePage == wCodePage)
+      return g_Bit2CodePage[i].wBit;
+  }
+  return (uint16_t)-1;
+}
+
+uint16_t FX_GetUnicodeBit(FX_WCHAR wcUnicode) {
+  const FGAS_FONTUSB* x = FGAS_GetUnicodeBitField(wcUnicode);
+  return x ? x->wBitField : 999;
+}
+
+inline uint8_t GetUInt8(const uint8_t* p) {
+  return (uint8_t)(p[0]);
+}
+
+inline uint16_t GetUInt16(const uint8_t* p) {
+  return (uint16_t)(p[0] << 8 | p[1]);
+}
+
+struct FX_BIT2CHARSET {
+  uint16_t wBit;
+  uint16_t wCharset;
+};
+
+const FX_BIT2CHARSET g_FX_Bit2Charset1[16] = {
+    {1 << 0, FX_CHARSET_ANSI},
+    {1 << 1, FX_CHARSET_MSWin_EasterEuropean},
+    {1 << 2, FX_CHARSET_MSWin_Cyrillic},
+    {1 << 3, FX_CHARSET_MSWin_Greek},
+    {1 << 4, FX_CHARSET_MSWin_Turkish},
+    {1 << 5, FX_CHARSET_MSWin_Hebrew},
+    {1 << 6, FX_CHARSET_MSWin_Arabic},
+    {1 << 7, FX_CHARSET_MSWin_Baltic},
+    {1 << 8, FX_CHARSET_MSWin_Vietnamese},
+    {1 << 9, FX_CHARSET_Default},
+    {1 << 10, FX_CHARSET_Default},
+    {1 << 11, FX_CHARSET_Default},
+    {1 << 12, FX_CHARSET_Default},
+    {1 << 13, FX_CHARSET_Default},
+    {1 << 14, FX_CHARSET_Default},
+    {1 << 15, FX_CHARSET_Default},
+};
+
+const FX_BIT2CHARSET g_FX_Bit2Charset2[16] = {
+    {1 << 0, FX_CHARSET_Thai},
+    {1 << 1, FX_CHARSET_ShiftJIS},
+    {1 << 2, FX_CHARSET_ChineseSimplified},
+    {1 << 3, FX_CHARSET_Korean},
+    {1 << 4, FX_CHARSET_ChineseTriditional},
+    {1 << 5, FX_CHARSET_Johab},
+    {1 << 6, FX_CHARSET_Default},
+    {1 << 7, FX_CHARSET_Default},
+    {1 << 8, FX_CHARSET_Default},
+    {1 << 9, FX_CHARSET_Default},
+    {1 << 10, FX_CHARSET_Default},
+    {1 << 11, FX_CHARSET_Default},
+    {1 << 12, FX_CHARSET_Default},
+    {1 << 13, FX_CHARSET_Default},
+    {1 << 14, FX_CHARSET_OEM},
+    {1 << 15, FX_CHARSET_Symbol},
+};
+
+const FX_BIT2CHARSET g_FX_Bit2Charset3[16] = {
+    {1 << 0, FX_CHARSET_Default},  {1 << 1, FX_CHARSET_Default},
+    {1 << 2, FX_CHARSET_Default},  {1 << 3, FX_CHARSET_Default},
+    {1 << 4, FX_CHARSET_Default},  {1 << 5, FX_CHARSET_Default},
+    {1 << 6, FX_CHARSET_Default},  {1 << 7, FX_CHARSET_Default},
+    {1 << 8, FX_CHARSET_Default},  {1 << 9, FX_CHARSET_Default},
+    {1 << 10, FX_CHARSET_Default}, {1 << 11, FX_CHARSET_Default},
+    {1 << 12, FX_CHARSET_Default}, {1 << 13, FX_CHARSET_Default},
+    {1 << 14, FX_CHARSET_Default}, {1 << 15, FX_CHARSET_Default},
+};
+
+const FX_BIT2CHARSET g_FX_Bit2Charset4[16] = {
+    {1 << 0, FX_CHARSET_Default},  {1 << 1, FX_CHARSET_Default},
+    {1 << 2, FX_CHARSET_Default},  {1 << 3, FX_CHARSET_Default},
+    {1 << 4, FX_CHARSET_Default},  {1 << 5, FX_CHARSET_Default},
+    {1 << 6, FX_CHARSET_Default},  {1 << 7, FX_CHARSET_Default},
+    {1 << 8, FX_CHARSET_Default},  {1 << 9, FX_CHARSET_Default},
+    {1 << 10, FX_CHARSET_Default}, {1 << 11, FX_CHARSET_Default},
+    {1 << 12, FX_CHARSET_Default}, {1 << 13, FX_CHARSET_Default},
+    {1 << 14, FX_CHARSET_Default}, {1 << 15, FX_CHARSET_US},
+};
+
+}  // namespace
+
+CFX_FontDescriptor::CFX_FontDescriptor()
+    : m_nFaceIndex(0), m_dwFontStyles(0), m_dwUsb(), m_dwCsb() {}
+
+CFX_FontDescriptor::~CFX_FontDescriptor() {}
+
+CFX_FontSourceEnum_File::CFX_FontSourceEnum_File() {
+  for (size_t i = 0; i < FX_ArraySize(g_FontFolders); ++i)
+    m_FolderPaths.Add(g_FontFolders[i]);
+}
+
+CFX_FontSourceEnum_File::~CFX_FontSourceEnum_File() {}
+
+CFX_ByteString CFX_FontSourceEnum_File::GetNextFile() {
+  FX_FileHandle* pCurHandle =
+      m_FolderQueue.GetSize() != 0
+          ? m_FolderQueue.GetDataPtr(m_FolderQueue.GetSize() - 1)->pFileHandle
+          : nullptr;
+  if (!pCurHandle) {
+    if (m_FolderPaths.GetSize() < 1)
+      return "";
+    pCurHandle =
+        FX_OpenFolder(m_FolderPaths[m_FolderPaths.GetSize() - 1].c_str());
+    FX_HandleParentPath hpp;
+    hpp.pFileHandle = pCurHandle;
+    hpp.bsParentPath = m_FolderPaths[m_FolderPaths.GetSize() - 1];
+    m_FolderQueue.Add(hpp);
+  }
+  CFX_ByteString bsName;
+  bool bFolder;
+  CFX_ByteString bsFolderSpearator =
+      CFX_ByteString::FromUnicode(CFX_WideString(FX_GetFolderSeparator()));
+  while (true) {
+    if (!FX_GetNextFile(pCurHandle, &bsName, &bFolder)) {
+      FX_CloseFolder(pCurHandle);
+      m_FolderQueue.RemoveAt(m_FolderQueue.GetSize() - 1);
+      if (m_FolderQueue.GetSize() == 0) {
+        m_FolderPaths.RemoveAt(m_FolderPaths.GetSize() - 1);
+        return m_FolderPaths.GetSize() != 0 ? GetNextFile() : "";
+      }
+      pCurHandle =
+          m_FolderQueue.GetDataPtr(m_FolderQueue.GetSize() - 1)->pFileHandle;
+      continue;
+    }
+    if (bsName == "." || bsName == "..")
+      continue;
+    if (bFolder) {
+      FX_HandleParentPath hpp;
+      hpp.bsParentPath =
+          m_FolderQueue.GetDataPtr(m_FolderQueue.GetSize() - 1)->bsParentPath +
+          bsFolderSpearator + bsName;
+      hpp.pFileHandle = FX_OpenFolder(hpp.bsParentPath.c_str());
+      if (!hpp.pFileHandle)
+        continue;
+      m_FolderQueue.Add(hpp);
+      pCurHandle = hpp.pFileHandle;
+      continue;
+    }
+    bsName =
+        m_FolderQueue.GetDataPtr(m_FolderQueue.GetSize() - 1)->bsParentPath +
+        bsFolderSpearator + bsName;
+    break;
+  }
+  return bsName;
+}
+
+FX_POSITION CFX_FontSourceEnum_File::GetStartPosition() {
+  m_wsNext = GetNextFile().UTF8Decode();
+  if (m_wsNext.GetLength() == 0)
+    return (FX_POSITION)0;
+  return (FX_POSITION)-1;
+}
+
+IFX_FileAccess* CFX_FontSourceEnum_File::GetNext(FX_POSITION& pos) {
+  IFX_FileAccess* pAccess = FX_CreateDefaultFileAccess(m_wsNext.AsStringC());
+  m_wsNext = GetNextFile().UTF8Decode();
+  pos = m_wsNext.GetLength() != 0 ? pAccess : nullptr;
+  return pAccess;
+}
+
+std::unique_ptr<CFGAS_FontMgr> CFGAS_FontMgr::Create(
+    CFX_FontSourceEnum_File* pFontEnum) {
+  if (!pFontEnum)
+    return nullptr;
+
+  auto pFontMgr = pdfium::MakeUnique<CFGAS_FontMgr>(pFontEnum);
+  if (!pFontMgr->EnumFonts())
+    return nullptr;
+  return pFontMgr;
+}
+
+CFGAS_FontMgr::CFGAS_FontMgr(CFX_FontSourceEnum_File* pFontEnum)
+    : m_pFontSource(pFontEnum) {}
+
+CFGAS_FontMgr::~CFGAS_FontMgr() {
+  for (int32_t i = 0; i < m_InstalledFonts.GetSize(); i++)
+    delete m_InstalledFonts[i];
+  FX_POSITION pos = m_Hash2CandidateList.GetStartPosition();
+  while (pos) {
+    uint32_t dwHash;
+    CFX_FontDescriptorInfos* pDescs;
+    m_Hash2CandidateList.GetNextAssoc(pos, dwHash, pDescs);
+    delete pDescs;
+  }
+  pos = m_Hash2Fonts.GetStartPosition();
+  while (pos) {
+    uint32_t dwHash;
+    CFX_ArrayTemplate<CFGAS_GEFont*>* pFonts;
+    m_Hash2Fonts.GetNextAssoc(pos, dwHash, pFonts);
+    for (int32_t i = 0; i < pFonts->GetSize(); i++)
+      delete pFonts->GetAt(i);
+    delete pFonts;
+  }
+  m_Hash2Fonts.RemoveAll();
+  pos = m_IFXFont2FileRead.GetStartPosition();
+  while (pos) {
+    CFGAS_GEFont* pFont;
+    IFX_SeekableReadStream* pFileRead;
+    m_IFXFont2FileRead.GetNextAssoc(pos, pFont, pFileRead);
+    pFileRead->Release();
+  }
+}
+
+bool CFGAS_FontMgr::EnumFontsFromFontMapper() {
+  CFX_FontMapper* pFontMapper =
+      CFX_GEModule::Get()->GetFontMgr()->GetBuiltinMapper();
+  if (!pFontMapper)
+    return false;
+
+  IFX_SystemFontInfo* pSystemFontInfo = pFontMapper->GetSystemFontInfo();
+  if (!pSystemFontInfo)
+    return false;
+
+  pSystemFontInfo->EnumFontList(pFontMapper);
+  for (int32_t i = 0; i < pFontMapper->GetFaceSize(); ++i) {
+    IFX_SeekableReadStream* pFontStream =
+        CreateFontStream(pFontMapper, pSystemFontInfo, i);
+    if (!pFontStream)
+      continue;
+
+    CFX_WideString wsFaceName =
+        CFX_WideString::FromLocal(pFontMapper->GetFaceName(i).c_str());
+    RegisterFaces(pFontStream, &wsFaceName);
+    pFontStream->Release();
+  }
+  if (m_InstalledFonts.GetSize() == 0)
+    return false;
+
+  return true;
+}
+
+bool CFGAS_FontMgr::EnumFontsFromFiles() {
+  CFX_GEModule::Get()->GetFontMgr()->InitFTLibrary();
+  FX_POSITION pos = m_pFontSource->GetStartPosition();
+  IFX_FileAccess* pFontSource = nullptr;
+  IFX_SeekableReadStream* pFontStream = nullptr;
+  while (pos) {
+    pFontSource = m_pFontSource->GetNext(pos);
+    pFontStream = pFontSource->CreateFileStream(FX_FILEMODE_ReadOnly);
+    if (!pFontStream) {
+      pFontSource->Release();
+      continue;
+    }
+    RegisterFaces(pFontStream, nullptr);
+    pFontStream->Release();
+    pFontSource->Release();
+  }
+  if (m_InstalledFonts.GetSize() == 0)
+    return false;
+  return true;
+}
+
+bool CFGAS_FontMgr::EnumFonts() {
+  if (EnumFontsFromFontMapper())
+    return true;
+  return EnumFontsFromFiles();
+}
+
+CFGAS_GEFont* CFGAS_FontMgr::GetFontByCodePage(uint16_t wCodePage,
+                                               uint32_t dwFontStyles,
+                                               const FX_WCHAR* pszFontFamily) {
+  CFX_ByteString bsHash;
+  bsHash.Format("%d, %d", wCodePage, dwFontStyles);
+  bsHash += CFX_WideString(pszFontFamily).UTF8Encode();
+  uint32_t dwHash = FX_HashCode_GetA(bsHash.AsStringC(), false);
+  CFX_ArrayTemplate<CFGAS_GEFont*>* pFonts = nullptr;
+  if (m_Hash2Fonts.Lookup(dwHash, pFonts)) {
+    if (!pFonts)
+      return nullptr;
+
+    if (pFonts->GetSize() != 0)
+      return pFonts->GetAt(0)->Retain();
+  }
+
+  if (!pFonts)
+    pFonts = new CFX_ArrayTemplate<CFGAS_GEFont*>;
+
+  m_Hash2Fonts.SetAt(dwHash, pFonts);
+  CFX_FontDescriptorInfos* sortedFonts = nullptr;
+  if (!m_Hash2CandidateList.Lookup(dwHash, sortedFonts)) {
+    sortedFonts = new CFX_FontDescriptorInfos;
+    MatchFonts(*sortedFonts, wCodePage, dwFontStyles,
+               CFX_WideString(pszFontFamily), 0);
+    m_Hash2CandidateList.SetAt(dwHash, sortedFonts);
+  }
+  if (sortedFonts->GetSize() == 0)
+    return nullptr;
+
+  CFX_FontDescriptor* pDesc = sortedFonts->GetAt(0).pFont;
+  CFGAS_GEFont* pFont =
+      LoadFont(pDesc->m_wsFaceName, pDesc->m_nFaceIndex, nullptr);
+  if (pFont)
+    pFont->SetLogicalFontStyle(dwFontStyles);
+
+  pFonts->Add(pFont);
+  return pFont;
+}
+
+CFGAS_GEFont* CFGAS_FontMgr::GetFontByUnicode(FX_WCHAR wUnicode,
+                                              uint32_t dwFontStyles,
+                                              const FX_WCHAR* pszFontFamily) {
+  CFGAS_GEFont* pFont = nullptr;
+  if (m_FailedUnicodes2Nullptr.Lookup(wUnicode, pFont))
+    return nullptr;
+  const FGAS_FONTUSB* x = FGAS_GetUnicodeBitField(wUnicode);
+  uint16_t wCodePage = x ? x->wCodePage : 0xFFFF;
+  uint16_t wBitField = x ? x->wBitField : 0x03E7;
+  CFX_ByteString bsHash;
+  if (wCodePage == 0xFFFF)
+    bsHash.Format("%d, %d, %d", wCodePage, wBitField, dwFontStyles);
+  else
+    bsHash.Format("%d, %d", wCodePage, dwFontStyles);
+  bsHash += CFX_WideString(pszFontFamily).UTF8Encode();
+  uint32_t dwHash = FX_HashCode_GetA(bsHash.AsStringC(), false);
+  CFX_ArrayTemplate<CFGAS_GEFont*>* pFonts = nullptr;
+  if (m_Hash2Fonts.Lookup(dwHash, pFonts)) {
+    if (!pFonts)
+      return nullptr;
+    for (int32_t i = 0; i < pFonts->GetSize(); ++i) {
+      if (VerifyUnicode(pFonts->GetAt(i), wUnicode))
+        return pFonts->GetAt(i)->Retain();
+    }
+  }
+  if (!pFonts)
+    pFonts = new CFX_ArrayTemplate<CFGAS_GEFont*>;
+  m_Hash2Fonts.SetAt(dwHash, pFonts);
+  CFX_FontDescriptorInfos* sortedFonts = nullptr;
+  if (!m_Hash2CandidateList.Lookup(dwHash, sortedFonts)) {
+    sortedFonts = new CFX_FontDescriptorInfos;
+    MatchFonts(*sortedFonts, wCodePage, dwFontStyles,
+               CFX_WideString(pszFontFamily), wUnicode);
+    m_Hash2CandidateList.SetAt(dwHash, sortedFonts);
+  }
+  for (int32_t i = 0; i < sortedFonts->GetSize(); ++i) {
+    CFX_FontDescriptor* pDesc = sortedFonts->GetAt(i).pFont;
+    if (!VerifyUnicode(pDesc, wUnicode))
+      continue;
+    pFont = LoadFont(pDesc->m_wsFaceName, pDesc->m_nFaceIndex, nullptr);
+    if (!pFont)
+      continue;
+    pFont->SetLogicalFontStyle(dwFontStyles);
+    pFonts->Add(pFont);
+    return pFont;
+  }
+  if (!pszFontFamily)
+    m_FailedUnicodes2Nullptr.SetAt(wUnicode, nullptr);
+  return nullptr;
+}
+
+bool CFGAS_FontMgr::VerifyUnicode(CFX_FontDescriptor* pDesc,
+                                  FX_WCHAR wcUnicode) {
+  IFX_SeekableReadStream* pFileRead =
+      CreateFontStream(pDesc->m_wsFaceName.UTF8Encode());
+  if (!pFileRead)
+    return false;
+  FXFT_Face pFace = LoadFace(pFileRead, pDesc->m_nFaceIndex);
+  FT_Error retCharmap = FXFT_Select_Charmap(pFace, FXFT_ENCODING_UNICODE);
+  FT_Error retIndex = FXFT_Get_Char_Index(pFace, wcUnicode);
+  pFileRead->Release();
+  if (!pFace)
+    return false;
+  if (FXFT_Get_Face_External_Stream(pFace))
+    FXFT_Clear_Face_External_Stream(pFace);
+  FXFT_Done_Face(pFace);
+  return !retCharmap && retIndex;
+}
+
+bool CFGAS_FontMgr::VerifyUnicode(CFGAS_GEFont* pFont, FX_WCHAR wcUnicode) {
+  if (!pFont)
+    return false;
+
+  FXFT_Face pFace = pFont->GetDevFont()->GetFace();
+  FXFT_CharMap charmap = FXFT_Get_Face_Charmap(pFace);
+  if (FXFT_Select_Charmap(pFace, FXFT_ENCODING_UNICODE) != 0)
+    return false;
+
+  if (FXFT_Get_Char_Index(pFace, wcUnicode) == 0) {
+    FXFT_Set_Charmap(pFace, charmap);
+    return false;
+  }
+  return true;
+}
+
+CFGAS_GEFont* CFGAS_FontMgr::LoadFont(const CFX_WideString& wsFaceName,
+                                      int32_t iFaceIndex,
+                                      int32_t* pFaceCount) {
+  CFX_FontMgr* pFontMgr = CFX_GEModule::Get()->GetFontMgr();
+  CFX_FontMapper* pFontMapper = pFontMgr->GetBuiltinMapper();
+  if (!pFontMapper)
+    return nullptr;
+
+  IFX_SystemFontInfo* pSystemFontInfo = pFontMapper->GetSystemFontInfo();
+  if (!pSystemFontInfo)
+    return nullptr;
+
+  IFX_SeekableReadStream* pFontStream =
+      CreateFontStream(wsFaceName.UTF8Encode());
+  if (!pFontStream)
+    return nullptr;
+
+  std::unique_ptr<CFX_Font> pInternalFont(new CFX_Font());
+  if (!pInternalFont->LoadFile(pFontStream, iFaceIndex)) {
+    pFontStream->Release();
+    return nullptr;
+  }
+
+  CFGAS_GEFont* pFont = CFGAS_GEFont::LoadFont(std::move(pInternalFont), this);
+  if (!pFont) {
+    pFontStream->Release();
+    return nullptr;
+  }
+
+  m_IFXFont2FileRead.SetAt(pFont, pFontStream);
+  if (pFaceCount)
+    *pFaceCount = pFont->GetDevFont()->GetFace()->num_faces;
+
+  return pFont;
+}
+
+extern "C" {
+
+unsigned long _ftStreamRead(FXFT_Stream stream,
+                            unsigned long offset,
+                            unsigned char* buffer,
+                            unsigned long count) {
+  if (count == 0)
+    return 0;
+
+  IFX_SeekableReadStream* pFile =
+      (IFX_SeekableReadStream*)stream->descriptor.pointer;
+  int res = pFile->ReadBlock(buffer, offset, count);
+  if (res)
+    return count;
+  return 0;
+}
+
+void _ftStreamClose(FXFT_Stream stream) {}
+
+};  // extern "C"
+
+FXFT_Face CFGAS_FontMgr::LoadFace(IFX_SeekableReadStream* pFontStream,
+                                  int32_t iFaceIndex) {
+  if (!pFontStream)
+    return nullptr;
+
+  CFX_FontMgr* pFontMgr = CFX_GEModule::Get()->GetFontMgr();
+  pFontMgr->InitFTLibrary();
+  FXFT_Library library = pFontMgr->GetFTLibrary();
+  if (!library)
+    return nullptr;
+
+  FXFT_Stream ftStream = FX_Alloc(FXFT_StreamRec, 1);
+  FXSYS_memset(ftStream, 0, sizeof(FXFT_StreamRec));
+  ftStream->base = nullptr;
+  ftStream->descriptor.pointer = pFontStream;
+  ftStream->pos = 0;
+  ftStream->size = (unsigned long)pFontStream->GetSize();
+  ftStream->read = _ftStreamRead;
+  ftStream->close = _ftStreamClose;
+
+  FXFT_Open_Args ftArgs;
+  FXSYS_memset(&ftArgs, 0, sizeof(FXFT_Open_Args));
+  ftArgs.flags |= FT_OPEN_STREAM;
+  ftArgs.stream = ftStream;
+
+  FXFT_Face pFace = nullptr;
+  if (FXFT_Open_Face(library, &ftArgs, iFaceIndex, &pFace)) {
+    FX_Free(ftStream);
+    return nullptr;
+  }
+
+  FXFT_Set_Pixel_Sizes(pFace, 0, 64);
+  return pFace;
+}
+
+IFX_SeekableReadStream* CFGAS_FontMgr::CreateFontStream(
+    CFX_FontMapper* pFontMapper,
+    IFX_SystemFontInfo* pSystemFontInfo,
+    uint32_t index) {
+  int iExact = 0;
+  void* hFont =
+      pSystemFontInfo->MapFont(0, 0, FXFONT_DEFAULT_CHARSET, 0,
+                               pFontMapper->GetFaceName(index).c_str(), iExact);
+  if (!hFont)
+    return nullptr;
+
+  uint32_t dwFileSize = pSystemFontInfo->GetFontData(hFont, 0, nullptr, 0);
+  if (dwFileSize == 0)
+    return nullptr;
+
+  uint8_t* pBuffer = FX_Alloc(uint8_t, dwFileSize + 1);
+  dwFileSize = pSystemFontInfo->GetFontData(hFont, 0, pBuffer, dwFileSize);
+
+  return FX_CreateMemoryStream(pBuffer, dwFileSize, true);
+}
+
+IFX_SeekableReadStream* CFGAS_FontMgr::CreateFontStream(
+    const CFX_ByteString& bsFaceName) {
+  CFX_FontMgr* pFontMgr = CFX_GEModule::Get()->GetFontMgr();
+  CFX_FontMapper* pFontMapper = pFontMgr->GetBuiltinMapper();
+
+  if (!pFontMapper)
+    return nullptr;
+
+  IFX_SystemFontInfo* pSystemFontInfo = pFontMapper->GetSystemFontInfo();
+  if (!pSystemFontInfo)
+    return nullptr;
+
+  pSystemFontInfo->EnumFontList(pFontMapper);
+  for (int32_t i = 0; i < pFontMapper->GetFaceSize(); ++i) {
+    if (pFontMapper->GetFaceName(i) == bsFaceName)
+      return CreateFontStream(pFontMapper, pSystemFontInfo, i);
+  }
+  return nullptr;
+}
+
+int32_t CFGAS_FontMgr::MatchFonts(CFX_FontDescriptorInfos& MatchedFonts,
+                                  uint16_t wCodePage,
+                                  uint32_t dwFontStyles,
+                                  const CFX_WideString& FontName,
+                                  FX_WCHAR wcUnicode) {
+  MatchedFonts.RemoveAll();
+  CFX_WideString wsNormalizedFontName = FontName;
+
+  CFX_FontDescriptor* pFont = nullptr;
+  int32_t nCount = m_InstalledFonts.GetSize();
+  for (int32_t i = 0; i < nCount; i++) {
+    pFont = m_InstalledFonts[i];
+    int32_t nPenalty = CalcPenalty(pFont, wCodePage, dwFontStyles,
+                                   wsNormalizedFontName, wcUnicode);
+    if (nPenalty >= 0xffff)
+      continue;
+
+    FX_FontDescriptorInfo FontInfo;
+    FontInfo.pFont = pFont;
+    FontInfo.nPenalty = nPenalty;
+    MatchedFonts.Add(FontInfo);
+    if (MatchedFonts.GetSize() == 0xffff)
+      break;
+  }
+  if (MatchedFonts.GetSize() == 0)
+    return 0;
+
+  CFX_SSortTemplate<FX_FontDescriptorInfo> ssort;
+  ssort.ShellSort(MatchedFonts.GetData(), MatchedFonts.GetSize());
+  return MatchedFonts.GetSize();
+}
+
+int32_t CFGAS_FontMgr::CalcPenalty(CFX_FontDescriptor* pInstalled,
+                                   uint16_t wCodePage,
+                                   uint32_t dwFontStyles,
+                                   const CFX_WideString& FontName,
+                                   FX_WCHAR wcUnicode) {
+  int32_t nPenalty = 30000;
+  if (0 != FontName.GetLength()) {
+    if (FontName != pInstalled->m_wsFaceName) {
+      int32_t i;
+      for (i = 0; i < pInstalled->m_wsFamilyNames.GetSize(); i++) {
+        if (pInstalled->m_wsFamilyNames[i] == FontName)
+          break;
+      }
+      if (i == pInstalled->m_wsFamilyNames.GetSize())
+        nPenalty += 0xFFFF;
+      else
+        nPenalty -= 28000;
+    } else {
+      nPenalty -= 30000;
+    }
+    if (30000 == nPenalty &&
+        0 == IsPartName(pInstalled->m_wsFaceName, FontName)) {
+      int32_t i;
+      for (i = 0; i < pInstalled->m_wsFamilyNames.GetSize(); i++) {
+        if (0 != IsPartName(pInstalled->m_wsFamilyNames[i], FontName))
+          break;
+      }
+      if (i == pInstalled->m_wsFamilyNames.GetSize())
+        nPenalty += 0xFFFF;
+      else
+        nPenalty -= 26000;
+    } else {
+      nPenalty -= 27000;
+    }
+  }
+  uint32_t dwStyleMask = pInstalled->m_dwFontStyles ^ dwFontStyles;
+  if (dwStyleMask & FX_FONTSTYLE_Bold)
+    nPenalty += 4500;
+  if (dwStyleMask & FX_FONTSTYLE_FixedPitch)
+    nPenalty += 10000;
+  if (dwStyleMask & FX_FONTSTYLE_Italic)
+    nPenalty += 10000;
+  if (dwStyleMask & FX_FONTSTYLE_Serif)
+    nPenalty += 500;
+  if (dwStyleMask & FX_FONTSTYLE_Symbolic)
+    nPenalty += 0xFFFF;
+  if (nPenalty >= 0xFFFF)
+    return 0xFFFF;
+  uint16_t wBit =
+      ((0 == wCodePage || 0xFFFF == wCodePage) ? (uint16_t)-1
+                                               : FX_GetCodePageBit(wCodePage));
+  if (wBit != (uint16_t)-1) {
+    ASSERT(wBit < 64);
+    if (0 == (pInstalled->m_dwCsb[wBit / 32] & (1 << (wBit % 32))))
+      nPenalty += 0xFFFF;
+    else
+      nPenalty -= 60000;
+  }
+  wBit =
+      ((0 == wcUnicode || 0xFFFE == wcUnicode) ? (uint16_t)999
+                                               : FX_GetUnicodeBit(wcUnicode));
+  if (wBit != (uint16_t)999) {
+    ASSERT(wBit < 128);
+    if (0 == (pInstalled->m_dwUsb[wBit / 32] & (1 << (wBit % 32))))
+      nPenalty += 0xFFFF;
+    else
+      nPenalty -= 60000;
+  }
+  return nPenalty;
+}
+
+void CFGAS_FontMgr::ClearFontCache() {
+  FX_POSITION pos = m_Hash2CandidateList.GetStartPosition();
+  while (pos) {
+    uint32_t dwHash;
+    CFX_FontDescriptorInfos* pDescs;
+    m_Hash2CandidateList.GetNextAssoc(pos, dwHash, pDescs);
+    delete pDescs;
+  }
+  pos = m_IFXFont2FileRead.GetStartPosition();
+  while (pos) {
+    CFGAS_GEFont* pFont;
+    IFX_SeekableReadStream* pFileRead;
+    m_IFXFont2FileRead.GetNextAssoc(pos, pFont, pFileRead);
+    pFileRead->Release();
+  }
+}
+
+void CFGAS_FontMgr::RemoveFont(CFGAS_GEFont* pEFont) {
+  if (!pEFont)
+    return;
+
+  IFX_SeekableReadStream* pFileRead;
+  if (m_IFXFont2FileRead.Lookup(pEFont, pFileRead)) {
+    pFileRead->Release();
+    m_IFXFont2FileRead.RemoveKey(pEFont);
+  }
+  FX_POSITION pos;
+  pos = m_Hash2Fonts.GetStartPosition();
+  while (pos) {
+    uint32_t dwHash;
+    CFX_ArrayTemplate<CFGAS_GEFont*>* pFonts;
+    m_Hash2Fonts.GetNextAssoc(pos, dwHash, pFonts);
+    if (pFonts) {
+      for (int32_t i = 0; i < pFonts->GetSize(); i++) {
+        if (pFonts->GetAt(i) == pEFont)
+          pFonts->SetAt(i, nullptr);
+      }
+    } else {
+      m_Hash2Fonts.RemoveKey(dwHash);
+    }
+  }
+}
+
+void CFGAS_FontMgr::RegisterFace(FXFT_Face pFace,
+                                 const CFX_WideString* pFaceName) {
+  if ((pFace->face_flags & FT_FACE_FLAG_SCALABLE) == 0)
+    return;
+
+  std::unique_ptr<CFX_FontDescriptor> pFont(new CFX_FontDescriptor);
+  pFont->m_dwFontStyles |= FXFT_Is_Face_Bold(pFace) ? FX_FONTSTYLE_Bold : 0;
+  pFont->m_dwFontStyles |= FXFT_Is_Face_Italic(pFace) ? FX_FONTSTYLE_Italic : 0;
+  pFont->m_dwFontStyles |= GetFlags(pFace);
+
+  std::vector<uint16_t> charsets = GetCharsets(pFace);
+  GetUSBCSB(pFace, pFont->m_dwUsb, pFont->m_dwCsb);
+
+  FT_ULong dwTag;
+  FT_ENC_TAG(dwTag, 'n', 'a', 'm', 'e');
+
+  std::vector<uint8_t> table;
+  unsigned long nLength = 0;
+  unsigned int error = FXFT_Load_Sfnt_Table(pFace, dwTag, 0, nullptr, &nLength);
+  if (error == 0 && nLength != 0) {
+    table.resize(nLength);
+    if (FXFT_Load_Sfnt_Table(pFace, dwTag, 0, table.data(), nullptr))
+      table.clear();
+  }
+  GetNames(table.empty() ? nullptr : table.data(), pFont->m_wsFamilyNames);
+
+  pFont->m_wsFamilyNames.Add(CFX_ByteString(pFace->family_name).UTF8Decode());
+  pFont->m_wsFaceName =
+      pFaceName ? *pFaceName
+                : CFX_WideString::FromLocal(FXFT_Get_Postscript_Name(pFace));
+  pFont->m_nFaceIndex = pFace->face_index;
+
+  m_InstalledFonts.Add(pFont.release());
+}
+
+void CFGAS_FontMgr::RegisterFaces(IFX_SeekableReadStream* pFontStream,
+                                  const CFX_WideString* pFaceName) {
+  int32_t index = 0;
+  int32_t num_faces = 0;
+  do {
+    FXFT_Face pFace = LoadFace(pFontStream, index++);
+    if (!pFace)
+      continue;
+    // All faces keep number of faces. It can be retrieved from any one face.
+    if (num_faces == 0)
+      num_faces = pFace->num_faces;
+    RegisterFace(pFace, pFaceName);
+    if (FXFT_Get_Face_External_Stream(pFace))
+      FXFT_Clear_Face_External_Stream(pFace);
+    FXFT_Done_Face(pFace);
+  } while (index < num_faces);
+}
+
+uint32_t CFGAS_FontMgr::GetFlags(FXFT_Face pFace) {
+  uint32_t flag = 0;
+  if (FT_IS_FIXED_WIDTH(pFace))
+    flag |= FX_FONTSTYLE_FixedPitch;
+  TT_OS2* pOS2 = (TT_OS2*)FT_Get_Sfnt_Table(pFace, ft_sfnt_os2);
+  if (!pOS2)
+    return flag;
+  if (pOS2->ulCodePageRange1 & (1 << 31))
+    flag |= FX_FONTSTYLE_Symbolic;
+  if (pOS2->panose[0] == 2) {
+    uint8_t uSerif = pOS2->panose[1];
+    if ((uSerif > 1 && uSerif < 10) || uSerif > 13)
+      flag |= FX_FONTSTYLE_Serif;
+  }
+  return flag;
+}
+
+void CFGAS_FontMgr::GetNames(const uint8_t* name_table,
+                             CFX_WideStringArray& Names) {
+  if (!name_table) {
+    return;
+  }
+  uint8_t* lpTable = (uint8_t*)name_table;
+  CFX_WideString wsFamily;
+  uint8_t* sp = lpTable + 2;
+  uint8_t* lpNameRecord = lpTable + 6;
+  uint16_t nNameCount = GetUInt16(sp);
+  uint8_t* lpStr = lpTable + GetUInt16(sp + 2);
+  for (uint16_t j = 0; j < nNameCount; j++) {
+    uint16_t nNameID = GetUInt16(lpNameRecord + j * 12 + 6);
+    if (nNameID != 1) {
+      continue;
+    }
+    uint16_t nPlatformID = GetUInt16(lpNameRecord + j * 12 + 0);
+    uint16_t nNameLength = GetUInt16(lpNameRecord + j * 12 + 8);
+    uint16_t nNameOffset = GetUInt16(lpNameRecord + j * 12 + 10);
+    wsFamily.clear();
+    if (nPlatformID != 1) {
+      for (uint16_t k = 0; k < nNameLength / 2; k++) {
+        FX_WCHAR wcTemp = GetUInt16(lpStr + nNameOffset + k * 2);
+        wsFamily += wcTemp;
+      }
+      Names.Add(wsFamily);
+    } else {
+      for (uint16_t k = 0; k < nNameLength; k++) {
+        FX_WCHAR wcTemp = GetUInt8(lpStr + nNameOffset + k);
+        wsFamily += wcTemp;
+      }
+      Names.Add(wsFamily);
+    }
+  }
+}
+
+// TODO(npm): Get rid of this #define
+#define CODEPAGERANGE_IMPLEMENT(n)                         \
+  for (int32_t i = 0; i < 16; i++) {                       \
+    if ((a##n & g_FX_Bit2Charset##n[i].wBit) != 0)         \
+      charsets.push_back(g_FX_Bit2Charset##n[i].wCharset); \
+  }
+
+std::vector<uint16_t> CFGAS_FontMgr::GetCharsets(FXFT_Face pFace) const {
+  std::vector<uint16_t> charsets;
+  TT_OS2* pOS2 = (TT_OS2*)FT_Get_Sfnt_Table(pFace, ft_sfnt_os2);
+  if (pOS2) {
+    uint16_t a1 = pOS2->ulCodePageRange1 & 0xffff;
+    CODEPAGERANGE_IMPLEMENT(1);
+    uint16_t a2 = (pOS2->ulCodePageRange1 >> 16) & 0xffff;
+    CODEPAGERANGE_IMPLEMENT(2);
+    uint16_t a3 = pOS2->ulCodePageRange2 & 0xffff;
+    CODEPAGERANGE_IMPLEMENT(3);
+    uint16_t a4 = (pOS2->ulCodePageRange2 >> 16) & 0xffff;
+    CODEPAGERANGE_IMPLEMENT(4);
+  } else {
+    charsets.push_back(FX_CHARSET_Default);
+  }
+  return charsets;
+}
+
+#undef CODEPAGERANGE_IMPLEMENT
+
+void CFGAS_FontMgr::GetUSBCSB(FXFT_Face pFace, uint32_t* USB, uint32_t* CSB) {
+  TT_OS2* pOS2 = (TT_OS2*)FT_Get_Sfnt_Table(pFace, ft_sfnt_os2);
+  if (pOS2) {
+    USB[0] = pOS2->ulUnicodeRange1;
+    USB[1] = pOS2->ulUnicodeRange2;
+    USB[2] = pOS2->ulUnicodeRange3;
+    USB[3] = pOS2->ulUnicodeRange4;
+    CSB[0] = pOS2->ulCodePageRange1;
+    CSB[1] = pOS2->ulCodePageRange2;
+  } else {
+    USB[0] = 0;
+    USB[1] = 0;
+    USB[2] = 0;
+    USB[3] = 0;
+    CSB[0] = 0;
+    CSB[1] = 0;
+  }
+}
+
+int32_t CFGAS_FontMgr::IsPartName(const CFX_WideString& Name1,
+                                  const CFX_WideString& Name2) {
+  if (Name1.Find(Name2.c_str()) != -1)
+    return 1;
+  return 0;
+}
+
+#endif  // _FXM_PLATFORM_ == _FXM_PLATFORM_WINDOWS_