FX_BOOL considered harmful.

core/include/fxcrt/fx_ucd.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_INCLUDE_FXCRT_FX_UCD_H_
 #define CORE_INCLUDE_FXCRT_FX_UCD_H_
 
 #include "fx_system.h"
@@ skipping 74 matching lines @@
     FX_CHARTYPE_Numeric                         = (5 << FX_CHARTYPEBITS),
     FX_CHARTYPE_Normal                          = (6 << FX_CHARTYPEBITS),
     FX_CHARTYPE_ArabicAlef                      = (7 << FX_CHARTYPEBITS),
     FX_CHARTYPE_ArabicSpecial           = (8 << FX_CHARTYPEBITS),
     FX_CHARTYPE_ArabicDistortion        = (9 << FX_CHARTYPEBITS),
     FX_CHARTYPE_ArabicNormal            = (10 << FX_CHARTYPEBITS),
     FX_CHARTYPE_ArabicForm                      = (11 << FX_CHARTYPEBITS),
     FX_CHARTYPE_Arabic                          = (12 << FX_CHARTYPEBITS),
 };
 FX_DWORD FX_GetUnicodeProperties(FX_WCHAR wch);
-FX_BOOL FX_IsCtrlCode(FX_WCHAR ch);
-FX_BOOL FX_IsRotationCode(FX_WCHAR ch);
-FX_BOOL FX_IsCombinationChar(FX_WCHAR wch);
-FX_BOOL FX_IsBidiChar(FX_WCHAR wch);
-FX_WCHAR FX_GetMirrorChar(FX_WCHAR wch, FX_BOOL bRTL, FX_BOOL bVertical);
-FX_WCHAR FX_GetMirrorChar(FX_WCHAR wch, FX_DWORD dwProps, FX_BOOL bRTL, FX_BOOL bVertical);
+bool    FX_IsCtrlCode(FX_WCHAR ch);
+bool    FX_IsRotationCode(FX_WCHAR ch);
+bool FX_IsCombinationChar(FX_WCHAR wch);
+bool    FX_IsBidiChar(FX_WCHAR wch);
+FX_WCHAR FX_GetMirrorChar(FX_WCHAR wch, bool bRTL, bool bVertical);
+FX_WCHAR FX_GetMirrorChar(FX_WCHAR wch, FX_DWORD dwProps, bool bRTL, bool bVertical);
 
 #endif  // CORE_INCLUDE_FXCRT_FX_UCD_H_