Added a fallback Win32 font information class for win32k lockdown.

core/src/fxge/win32/fx_win32_device.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 "../../../include/fxge/fx_ge.h"
 
 #if _FX_OS_ == _FX_WIN32_DESKTOP_ || _FX_OS_ == _FX_WIN64_DESKTOP_
 #include <crtdbg.h>
 
 #include "../../../include/fxcodec/fx_codec.h"
 #include "../../../include/fxge/fx_freetype.h"
 #include "../../../include/fxge/fx_ge_win32.h"
 #include "../agg/include/fx_agg_driver.h"
 #include "../dib/dib_int.h"
 #include "../ge/text_int.h"
 #include "dwrite_int.h"
 #include "win32_int.h"
 
+class CFX_Win32FallbackFontInfo final : public CFX_FolderFontInfo {
+ public:
+  void* MapFont(int weight,
+                FX_BOOL bItalic,
+                int charset,
+                int pitch_family,
+                const FX_CHAR* family,
+                int& iExact) override;
+};
 class CFX_Win32FontInfo final : public IFX_SystemFontInfo {
  public:
   CFX_Win32FontInfo();
   ~CFX_Win32FontInfo() override;
 
   // IFX_SystemFontInfo
   void Release() override;
   FX_BOOL EnumFontList(CFX_FontMapper* pMapper) override;
   void* MapFont(int weight,
                 FX_BOOL bItalic,
@@ skipping 161 matching lines @@
     if (thisname[0] == ' ') {
       if (thisname.Mid(1, name.GetLength()) == name) {
         return m_pMapper->m_InstalledTTFonts[i + 1];
       }
     } else if (thisname.Left(name.GetLength()) == name) {
       return m_pMapper->m_InstalledTTFonts[i];
     }
   }
   return CFX_ByteString();
 }
+void* CFX_Win32FallbackFontInfo::MapFont(int weight,
+                                         FX_BOOL bItalic,
+                                         int charset,
+                                         int pitch_family,
+                                         const FX_CHAR* cstr_face,
+                                         int& iExact) {
+  void* font = GetSubstFont(cstr_face);
+  if (font) {
+    iExact = 1;
+    return font;
+  }
+  FX_BOOL bCJK = TRUE;
+  switch (charset) {
+    case FXFONT_SHIFTJIS_CHARSET:
+    case FXFONT_GB2312_CHARSET:
+    case FXFONT_CHINESEBIG5_CHARSET:
+    case FXFONT_HANGEUL_CHARSET:
+    default:
+      bCJK = FALSE;
+      break;
+  }
+  return FindFont(weight, bItalic, charset, pitch_family, cstr_face, !bCJK);
+}
 struct _FontNameMap {
   const FX_CHAR* m_pSubFontName;
   const FX_CHAR* m_pSrcFontName;
 };
 const _FontNameMap g_JpFontNameMap[] = {
     {"MS Mincho", "Heiseimin-W3"},
     {"MS Gothic", "Jun101-Light"},
 };
 extern "C" {
 static int compareString(const void* key, const void* element) {
@@ skipping 187 matching lines @@
 }
 FX_BOOL CFX_Win32FontInfo::GetFontCharset(void* hFont, int& charset) {
   TEXTMETRIC tm;
   HFONT hOldFont = (HFONT)::SelectObject(m_hDC, (HFONT)hFont);
   ::GetTextMetrics(m_hDC, &tm);
   ::SelectObject(m_hDC, hOldFont);
   charset = tm.tmCharSet;
   return TRUE;
 }
 IFX_SystemFontInfo* IFX_SystemFontInfo::CreateDefault(const char** pUnused) {
-  return new CFX_Win32FontInfo;
+  HDC hdc = ::GetDC(NULL);
+  if (hdc) {
+    ::ReleaseDC(NULL, hdc);
+    return new CFX_Win32FontInfo;
+  }
+  // If GDI is disabled then GetDC for the desktop will fail. Select the
+  // fallback font information class if GDI is disabled.
+  CFX_Win32FallbackFontInfo* pInfoFallback = new CFX_Win32FallbackFontInfo;
+  // Construct the font path manually, SHGetKnownFolderPath won't work under
+  // a restrictive sandbox.
+  CHAR windows_path[MAX_PATH] = {};
+  DWORD path_len = ::GetWindowsDirectoryA(windows_path, MAX_PATH);
+  if (path_len > 0 && path_len < MAX_PATH) {
+    CFX_ByteString fonts_path(windows_path);
+    fonts_path += "\\Fonts";
+    pInfoFallback->AddPath(fonts_path);
+  }
+  return pInfoFallback;
 }
 void CFX_GEModule::InitPlatform() {
   CWin32Platform* pPlatformData = new CWin32Platform;
   OSVERSIONINFO ver;
   ver.dwOSVersionInfoSize = sizeof(ver);
   GetVersionEx(&ver);
   pPlatformData->m_bHalfTone = ver.dwMajorVersion >= 5;
   pPlatformData->m_GdiplusExt.Load();
   m_pPlatformData = pPlatformData;
   m_pFontMgr->SetSystemFontInfo(IFX_SystemFontInfo::CreateDefault(nullptr));
@@ skipping 889 matching lines @@
     SelectObject(m_hDC, m_hOldBitmap);
     DeleteDC(m_hDC);
   }
   if (m_hBitmap) {
     DeleteObject(m_hBitmap);
   }
   delete GetBitmap();
 }
 
 #endif  // _FX_OS_ == _FX_WIN32_DESKTOP_ || _FX_OS_ == _FX_WIN64_