Merge to XFA: Add more overrides.

Using Chromium's clang + build options, there's more override warnings.

TBR=tsepez@chromium.org

Review URL: https://codereview.chromium.org/1453643002 .

(cherry picked from commit 126ba519bdd489ec6c285d1410dcae773e8ef673)

Review URL: https://codereview.chromium.org/1458373002 .

10 files changed, 188 insertions, 197 deletions

diff --git a/core/include/fpdfapi/fpdf_resource.h b/core/include/fpdfapi/fpdf_resource.h
index ccecce83eb..6c39e381f5 100644
--- a/core/include/fpdfapi/fpdf_resource.h
+++ b/core/include/fpdfapi/fpdf_resource.h
@@ -346,21 +346,23 @@ class CPDF_Type1Font : public CPDF_SimpleFont {
   CPDF_Type1Font();
 
   int GetBase14Font() { return m_Base14Font; }
-  virtual int GlyphFromCharCodeExt(FX_DWORD charcode);
 
  protected:
-  virtual FX_BOOL _Load();
+  // CPDF_SimpleFont:
+  int GlyphFromCharCodeExt(FX_DWORD charcode) override;
+  FX_BOOL _Load() override;
+  void LoadGlyphMap() override;
 
   int m_Base14Font;
-  virtual void LoadGlyphMap();
 };
 class CPDF_TrueTypeFont : public CPDF_SimpleFont {
  public:
   CPDF_TrueTypeFont();
 
  protected:
-  virtual FX_BOOL _Load();
-  virtual void LoadGlyphMap();
+  // CPDF_SimpleFont:
+  FX_BOOL _Load() override;
+  void LoadGlyphMap() override;
 };
 
 class CPDF_Type3Char {
@@ -428,33 +430,33 @@ class CPDF_CIDFont : public CPDF_Font {
 
   static FX_FLOAT CIDTransformToFloat(uint8_t ch);
 
-  FX_BOOL LoadGB2312();
+  // CPDF_Font:
   int GlyphFromCharCode(FX_DWORD charcode, FX_BOOL* pVertGlyph = NULL) override;
   int GetCharWidthF(FX_DWORD charcode, int level = 0) override;
   void GetCharBBox(FX_DWORD charcode, FX_RECT& rect, int level = 0) override;
-  FX_WORD CIDFromCharCode(FX_DWORD charcode) const;
-
-  FX_BOOL IsTrueType() const { return !m_bType1; }
-
-  virtual FX_DWORD GetNextChar(const FX_CHAR* pString,
-                               int nStrLen,
-                               int& offset) const override;
+  FX_DWORD GetNextChar(const FX_CHAR* pString,
+                       int nStrLen,
+                       int& offset) const override;
   int CountChar(const FX_CHAR* pString, int size) const override;
   int AppendChar(FX_CHAR* str, FX_DWORD charcode) const override;
   int GetCharSize(FX_DWORD charcode) const override;
-  const uint8_t* GetCIDTransform(FX_WORD CID) const;
   FX_BOOL IsVertWriting() const override;
+  FX_BOOL IsUnicodeCompatible() const override;
+  FX_BOOL _Load() override;
+  FX_WCHAR _UnicodeFromCharCode(FX_DWORD charcode) const override;
+  FX_DWORD _CharCodeFromUnicode(FX_WCHAR Unicode) const override;
+
+  FX_BOOL LoadGB2312();
+  FX_WORD CIDFromCharCode(FX_DWORD charcode) const;
+  FX_BOOL IsTrueType() const { return !m_bType1; }
+  const uint8_t* GetCIDTransform(FX_WORD CID) const;
   short GetVertWidth(FX_WORD CID) const;
   void GetVertOrigin(FX_WORD CID, short& vx, short& vy) const;
-  FX_BOOL IsUnicodeCompatible() const override;
   virtual FX_BOOL IsFontStyleFromCharCode(FX_DWORD charcode) const;
 
  protected:
   friend class CPDF_Font;
 
-  FX_BOOL _Load() override;
-  FX_WCHAR _UnicodeFromCharCode(FX_DWORD charcode) const override;
-  FX_DWORD _CharCodeFromUnicode(FX_WCHAR Unicode) const override;
   int GetGlyphIndex(FX_DWORD unicodeb, FX_BOOL* pVertGlyph);
   void LoadMetricsArray(CPDF_Array* pArray,
                         CFX_DWordArray& result,
diff --git a/core/include/fxcrt/fx_stream.h b/core/include/fxcrt/fx_stream.h
index c369830382..544eacdb5b 100644
--- a/core/include/fxcrt/fx_stream.h
+++ b/core/include/fxcrt/fx_stream.h
@@ -62,76 +62,71 @@ class IFX_StreamWrite {
   virtual void Release() = 0;
   virtual FX_BOOL WriteBlock(const void* pData, size_t size) = 0;
 };
+
 class IFX_FileWrite : public IFX_StreamWrite {
  public:
-  virtual void Release() = 0;
+  // IFX_StreamWrite:
+  FX_BOOL WriteBlock(const void* pData, size_t size) override {
+    return WriteBlock(pData, GetSize(), size);
+  }
 
   virtual FX_FILESIZE GetSize() = 0;
-
   virtual FX_BOOL Flush() = 0;
-
   virtual FX_BOOL WriteBlock(const void* pData,
                              FX_FILESIZE offset,
                              size_t size) = 0;
-  virtual FX_BOOL WriteBlock(const void* pData, size_t size) {
-    return WriteBlock(pData, GetSize(), size);
-  }
 };
+
 class IFX_StreamRead {
  public:
   virtual ~IFX_StreamRead() {}
 
   virtual void Release() = 0;
-
   virtual FX_BOOL IsEOF() = 0;
-
   virtual FX_FILESIZE GetPosition() = 0;
-
   virtual size_t ReadBlock(void* buffer, size_t size) = 0;
 };
+
 class IFX_FileRead : IFX_StreamRead {
  public:
-  virtual void Release() = 0;
-
-  virtual FX_FILESIZE GetSize() = 0;
-
-  virtual FX_BOOL IsEOF() { return FALSE; }
-
-  virtual FX_FILESIZE GetPosition() { return 0; }
+  // IFX_StreamRead:
+  void Release() override = 0;
+  FX_BOOL IsEOF() override { return FALSE; }
+  FX_FILESIZE GetPosition() override { return 0; }
+  size_t ReadBlock(void* buffer, size_t size) override { return 0; }
 
   virtual FX_BOOL ReadBlock(void* buffer, FX_FILESIZE offset, size_t size) = 0;
-
-  virtual size_t ReadBlock(void* buffer, size_t size) { return 0; }
+  virtual FX_FILESIZE GetSize() = 0;
 };
+
 IFX_FileRead* FX_CreateFileRead(const FX_CHAR* filename);
 IFX_FileRead* FX_CreateFileRead(const FX_WCHAR* filename);
+
 class IFX_FileStream : public IFX_FileRead, public IFX_FileWrite {
  public:
   virtual IFX_FileStream* Retain() = 0;
 
-  virtual void Release() = 0;
-
-  virtual FX_FILESIZE GetSize() = 0;
-
-  virtual FX_BOOL IsEOF() = 0;
-
-  virtual FX_FILESIZE GetPosition() = 0;
-
-  virtual FX_BOOL ReadBlock(void* buffer, FX_FILESIZE offset, size_t size) = 0;
-
-  virtual size_t ReadBlock(void* buffer, size_t size) = 0;
-
-  virtual FX_BOOL WriteBlock(const void* buffer,
-                             FX_FILESIZE offset,
-                             size_t size) = 0;
-  virtual FX_BOOL WriteBlock(const void* buffer, size_t size) {
+  // IFX_FileRead:
+  void Release() override = 0;
+  FX_BOOL IsEOF() override = 0;
+  FX_FILESIZE GetPosition() override = 0;
+  size_t ReadBlock(void* buffer, size_t size) override = 0;
+  FX_BOOL ReadBlock(void* buffer, FX_FILESIZE offset, size_t size) override = 0;
+  FX_FILESIZE GetSize() override = 0;
+
+  // IFX_FileWrite:
+  FX_BOOL WriteBlock(const void* buffer,
+                     FX_FILESIZE offset,
+                     size_t size) override = 0;
+  FX_BOOL WriteBlock(const void* buffer, size_t size) override {
     return WriteBlock(buffer, GetSize(), size);
   }
-
-  virtual FX_BOOL Flush() = 0;
+  FX_BOOL Flush() override = 0;
 };
+
 IFX_FileStream* FX_CreateFileStream(const FX_CHAR* filename, FX_DWORD dwModes);
 IFX_FileStream* FX_CreateFileStream(const FX_WCHAR* filename, FX_DWORD dwModes);
+
 class IFX_FileAccess {
  public:
   virtual ~IFX_FileAccess() {}
@@ -141,6 +136,7 @@ class IFX_FileAccess {
   virtual IFX_FileStream* CreateFileStream(FX_DWORD dwModes) = 0;
 };
 IFX_FileAccess* FX_CreateDefaultFileAccess(const CFX_WideStringC& wsPath);
+
 class IFX_MemoryStream : public IFX_FileStream {
  public:
   virtual FX_BOOL IsConsecutive() const = 0;
@@ -161,20 +157,15 @@ IFX_MemoryStream* FX_CreateMemoryStream(uint8_t* pBuffer,
 IFX_MemoryStream* FX_CreateMemoryStream(FX_BOOL bConsecutive = FALSE);
 class IFX_BufferRead : public IFX_StreamRead {
  public:
-  virtual void Release() = 0;
-
-  virtual FX_BOOL IsEOF() = 0;
-
-  virtual FX_FILESIZE GetPosition() = 0;
-
-  virtual size_t ReadBlock(void* buffer, size_t size) = 0;
+  // IFX_StreamRead:
+  void Release() override = 0;
+  FX_BOOL IsEOF() override = 0;
+  FX_FILESIZE GetPosition() override = 0;
+  size_t ReadBlock(void* buffer, size_t size) override = 0;
 
   virtual FX_BOOL ReadNextBlock(FX_BOOL bRestart = FALSE) = 0;
-
   virtual const uint8_t* GetBlockBuffer() = 0;
-
   virtual size_t GetBlockSize() = 0;
-
   virtual FX_FILESIZE GetBlockOffset() = 0;
 };
 
diff --git a/core/src/fpdfapi/fpdf_font/ttgsubtable.h b/core/src/fpdfapi/fpdf_font/ttgsubtable.h
index 7dd8cce36c..e3c9965654 100644
--- a/core/src/fpdfapi/fpdf_font/ttgsubtable.h
+++ b/core/src/fpdfapi/fpdf_font/ttgsubtable.h
@@ -260,7 +260,7 @@ class CFX_CTTGSUBTable {
     TSingleSubstFormat2() : Coverage(NULL), GlyphCount(0), Substitute(NULL) {
       SubstFormat = 2;
     }
-    ~TSingleSubstFormat2() {
+    ~TSingleSubstFormat2() override {
       delete Coverage;
       delete[] Substitute;
     }
@@ -356,8 +356,7 @@ class CFX_CTTGSUBTable {
 class CFX_GSUBTable final : public IFX_GSUBTable {
  public:
   ~CFX_GSUBTable() override {}
-  virtual FX_BOOL GetVerticalGlyph(FX_DWORD glyphnum,
-                                   FX_DWORD* vglyphnum) override;
+  FX_BOOL GetVerticalGlyph(FX_DWORD glyphnum, FX_DWORD* vglyphnum) override;
 
   CFX_CTTGSUBTable m_GsubImp;
 };
diff --git a/core/src/fxcodec/codec/codec_int.h b/core/src/fxcodec/codec/codec_int.h
index eeaac886dd..199df82512 100644
--- a/core/src/fxcodec/codec/codec_int.h
+++ b/core/src/fxcodec/codec/codec_int.h
@@ -21,20 +21,21 @@ class CFX_IccTransformCache;
 
 class CCodec_BasicModule : public ICodec_BasicModule {
  public:
-  virtual FX_BOOL RunLengthEncode(const uint8_t* src_buf,
-                                  FX_DWORD src_size,
-                                  uint8_t*& dest_buf,
-                                  FX_DWORD& dest_size);
-  virtual FX_BOOL A85Encode(const uint8_t* src_buf,
-                            FX_DWORD src_size,
-                            uint8_t*& dest_buf,
-                            FX_DWORD& dest_size);
-  virtual ICodec_ScanlineDecoder* CreateRunLengthDecoder(const uint8_t* src_buf,
-                                                         FX_DWORD src_size,
-                                                         int width,
-                                                         int height,
-                                                         int nComps,
-                                                         int bpc);
+  // ICodec_BasicModule:
+  FX_BOOL RunLengthEncode(const uint8_t* src_buf,
+                          FX_DWORD src_size,
+                          uint8_t*& dest_buf,
+                          FX_DWORD& dest_size) override;
+  FX_BOOL A85Encode(const uint8_t* src_buf,
+                    FX_DWORD src_size,
+                    uint8_t*& dest_buf,
+                    FX_DWORD& dest_size) override;
+  ICodec_ScanlineDecoder* CreateRunLengthDecoder(const uint8_t* src_buf,
+                                                 FX_DWORD src_size,
+                                                 int width,
+                                                 int height,
+                                                 int nComps,
+                                                 int bpc) override;
 };
 
 class CCodec_ScanlineDecoder : public ICodec_ScanlineDecoder {
@@ -101,22 +102,23 @@ class CCodec_ScanlineDecoder : public ICodec_ScanlineDecoder {
 
 class CCodec_FaxModule : public ICodec_FaxModule {
  public:
-  virtual ICodec_ScanlineDecoder* CreateDecoder(const uint8_t* src_buf,
-                                                FX_DWORD src_size,
-                                                int width,
-                                                int height,
-                                                int K,
-                                                FX_BOOL EndOfLine,
-                                                FX_BOOL EncodedByteAlign,
-                                                FX_BOOL BlackIs1,
-                                                int Columns,
-                                                int Rows);
+  // ICodec_FaxModule:
+  ICodec_ScanlineDecoder* CreateDecoder(const uint8_t* src_buf,
+                                        FX_DWORD src_size,
+                                        int width,
+                                        int height,
+                                        int K,
+                                        FX_BOOL EndOfLine,
+                                        FX_BOOL EncodedByteAlign,
+                                        FX_BOOL BlackIs1,
+                                        int Columns,
+                                        int Rows) override;
   FX_BOOL Encode(const uint8_t* src_buf,
                  int width,
                  int height,
                  int pitch,
                  uint8_t*& dest_buf,
-                 FX_DWORD& dest_size);
+                 FX_DWORD& dest_size) override;
 };
 
 class CCodec_FlateModule : public ICodec_FlateModule {
@@ -258,42 +260,45 @@ class CCodec_BmpModule : public ICodec_BmpModule {
 };
 class CCodec_IccModule : public ICodec_IccModule {
  public:
-  virtual IccCS GetProfileCS(const uint8_t* pProfileData,
-                             unsigned int dwProfileSize);
-  virtual IccCS GetProfileCS(IFX_FileRead* pFile);
-  virtual void* CreateTransform(
-      ICodec_IccModule::IccParam* pInputParam,
-      ICodec_IccModule::IccParam* pOutputParam,
-      ICodec_IccModule::IccParam* pProofParam = NULL,
-      FX_DWORD dwIntent = Icc_INTENT_PERCEPTUAL,
-      FX_DWORD dwFlag = Icc_FLAGS_DEFAULT,
-      FX_DWORD dwPrfIntent = Icc_INTENT_ABSOLUTE_COLORIMETRIC,
-      FX_DWORD dwPrfFlag = Icc_FLAGS_SOFTPROOFING);
-  virtual void* CreateTransform_sRGB(const uint8_t* pProfileData,
-                                     FX_DWORD dwProfileSize,
-                                     int32_t& nComponents,
-                                     int32_t intent = 0,
-                                     FX_DWORD dwSrcFormat = Icc_FORMAT_DEFAULT);
-  virtual void* CreateTransform_CMYK(const uint8_t* pSrcProfileData,
-                                     FX_DWORD dwSrcProfileSize,
-                                     int32_t& nSrcComponents,
-                                     const uint8_t* pDstProfileData,
-                                     FX_DWORD dwDstProfileSize,
-                                     int32_t intent = 0,
-                                     FX_DWORD dwSrcFormat = Icc_FORMAT_DEFAULT,
-                                     FX_DWORD dwDstFormat = Icc_FORMAT_DEFAULT);
-  virtual void DestroyTransform(void* pTransform);
-  virtual void Translate(void* pTransform,
-                         FX_FLOAT* pSrcValues,
-                         FX_FLOAT* pDestValues);
-  virtual void TranslateScanline(void* pTransform,
-                                 uint8_t* pDest,
-                                 const uint8_t* pSrc,
-                                 int pixels);
-  virtual void SetComponents(FX_DWORD nComponents) {
+  ~CCodec_IccModule() override;
+
+  // ICodec_IccModule:
+  IccCS GetProfileCS(const uint8_t* pProfileData,
+                     unsigned int dwProfileSize) override;
+  IccCS GetProfileCS(IFX_FileRead* pFile) override;
+  void* CreateTransform(ICodec_IccModule::IccParam* pInputParam,
+                        ICodec_IccModule::IccParam* pOutputParam,
+                        ICodec_IccModule::IccParam* pProofParam = NULL,
+                        FX_DWORD dwIntent = Icc_INTENT_PERCEPTUAL,
+                        FX_DWORD dwFlag = Icc_FLAGS_DEFAULT,
+                        FX_DWORD dwPrfIntent = Icc_INTENT_ABSOLUTE_COLORIMETRIC,
+                        FX_DWORD dwPrfFlag = Icc_FLAGS_SOFTPROOFING) override;
+  void* CreateTransform_sRGB(
+      const uint8_t* pProfileData,
+      FX_DWORD dwProfileSize,
+      int32_t& nComponents,
+      int32_t intent = 0,
+      FX_DWORD dwSrcFormat = Icc_FORMAT_DEFAULT) override;
+  void* CreateTransform_CMYK(
+      const uint8_t* pSrcProfileData,
+      FX_DWORD dwSrcProfileSize,
+      int32_t& nSrcComponents,
+      const uint8_t* pDstProfileData,
+      FX_DWORD dwDstProfileSize,
+      int32_t intent = 0,
+      FX_DWORD dwSrcFormat = Icc_FORMAT_DEFAULT,
+      FX_DWORD dwDstFormat = Icc_FORMAT_DEFAULT) override;
+  void DestroyTransform(void* pTransform) override;
+  void Translate(void* pTransform,
+                 FX_FLOAT* pSrcValues,
+                 FX_FLOAT* pDestValues) override;
+  void TranslateScanline(void* pTransform,
+                         uint8_t* pDest,
+                         const uint8_t* pSrc,
+                         int pixels) override;
+  void SetComponents(FX_DWORD nComponents) override {
     m_nComponents = nComponents;
   }
-  virtual ~CCodec_IccModule();
 
  protected:
   enum Icc_CLASS {
diff --git a/core/src/fxcodec/codec/fx_codec_jbig.cpp b/core/src/fxcodec/codec/fx_codec_jbig.cpp
index aa9f1811b7..8c7f1bcc7a 100644
--- a/core/src/fxcodec/codec/fx_codec_jbig.cpp
+++ b/core/src/fxcodec/codec/fx_codec_jbig.cpp
@@ -14,7 +14,7 @@ class JBig2DocumentContext : public CFX_DestructObject {
     return &m_SymbolDictCache;
   }
 
-  ~JBig2DocumentContext() {
+  ~JBig2DocumentContext() override {
     for (auto it : m_SymbolDictCache) {
       delete it.second;
     }
diff --git a/core/src/fxcrt/extension.h b/core/src/fxcrt/extension.h
index 038fa30e70..718c8f0423 100644
--- a/core/src/fxcrt/extension.h
+++ b/core/src/fxcrt/extension.h
@@ -136,23 +136,23 @@ class CFX_MemoryStream final : public IFX_MemoryStream {
     }
     m_Blocks.RemoveAll();
   }
-  virtual IFX_FileStream* Retain() override {
+
+  // IFX_MemoryStream:
+  IFX_FileStream* Retain() override {
     m_dwCount++;
     return this;
   }
-  virtual void Release() override {
+  void Release() override {
     FX_DWORD nCount = --m_dwCount;
     if (nCount) {
       return;
     }
     delete this;
   }
-  virtual FX_FILESIZE GetSize() override { return (FX_FILESIZE)m_nCurSize; }
-  virtual FX_BOOL IsEOF() override { return m_nCurPos >= (size_t)GetSize(); }
-  virtual FX_FILESIZE GetPosition() override { return (FX_FILESIZE)m_nCurPos; }
-  virtual FX_BOOL ReadBlock(void* buffer,
-                            FX_FILESIZE offset,
-                            size_t size) override {
+  FX_FILESIZE GetSize() override { return (FX_FILESIZE)m_nCurSize; }
+  FX_BOOL IsEOF() override { return m_nCurPos >= (size_t)GetSize(); }
+  FX_FILESIZE GetPosition() override { return (FX_FILESIZE)m_nCurPos; }
+  FX_BOOL ReadBlock(void* buffer, FX_FILESIZE offset, size_t size) override {
     if (!buffer || !size) {
       return FALSE;
     }
@@ -185,7 +185,7 @@ class CFX_MemoryStream final : public IFX_MemoryStream {
     }
     return TRUE;
   }
-  virtual size_t ReadBlock(void* buffer, size_t size) override {
+  size_t ReadBlock(void* buffer, size_t size) override {
     if (m_nCurPos >= m_nCurSize) {
       return 0;
     }
@@ -195,9 +195,9 @@ class CFX_MemoryStream final : public IFX_MemoryStream {
     }
     return nRead;
   }
-  virtual FX_BOOL WriteBlock(const void* buffer,
-                             FX_FILESIZE offset,
-                             size_t size) override {
+  FX_BOOL WriteBlock(const void* buffer,
+                     FX_FILESIZE offset,
+                     size_t size) override {
     if (!buffer || !size) {
       return FALSE;
     }
@@ -255,11 +255,11 @@ class CFX_MemoryStream final : public IFX_MemoryStream {
     }
     return TRUE;
   }
-  virtual FX_BOOL Flush() override { return TRUE; }
-  virtual FX_BOOL IsConsecutive() const override {
+  FX_BOOL Flush() override { return TRUE; }
+  FX_BOOL IsConsecutive() const override {
     return m_dwFlags & FX_MEMSTREAM_Consecutive;
   }
-  virtual void EstimateSize(size_t nInitSize, size_t nGrowSize) override {
+  void EstimateSize(size_t nInitSize, size_t nGrowSize) override {
     if (m_dwFlags & FX_MEMSTREAM_Consecutive) {
       if (m_Blocks.GetSize() < 1) {
         uint8_t* pBlock = FX_Alloc(uint8_t, FX_MAX(nInitSize, 4096));
@@ -270,12 +270,12 @@ class CFX_MemoryStream final : public IFX_MemoryStream {
       m_nGrowSize = FX_MAX(nGrowSize, 4096);
     }
   }
-  virtual uint8_t* GetBuffer() const override {
+  uint8_t* GetBuffer() const override {
     return m_Blocks.GetSize() ? (uint8_t*)m_Blocks[0] : NULL;
   }
-  virtual void AttachBuffer(uint8_t* pBuffer,
-                            size_t nSize,
-                            FX_BOOL bTakeOver = FALSE) override {
+  void AttachBuffer(uint8_t* pBuffer,
+                    size_t nSize,
+                    FX_BOOL bTakeOver = FALSE) override {
     if (!(m_dwFlags & FX_MEMSTREAM_Consecutive)) {
       return;
     }
@@ -286,7 +286,7 @@ class CFX_MemoryStream final : public IFX_MemoryStream {
     m_dwFlags =
         FX_MEMSTREAM_Consecutive | (bTakeOver ? FX_MEMSTREAM_TakeOver : 0);
   }
-  virtual void DetachBuffer() override {
+  void DetachBuffer() override {
     if (!(m_dwFlags & FX_MEMSTREAM_Consecutive)) {
       return;
     }
diff --git a/fpdfsdk/include/fsdk_baseannot.h b/fpdfsdk/include/fsdk_baseannot.h
index c54310c0b0..e9a33129b0 100644
--- a/fpdfsdk/include/fsdk_baseannot.h
+++ b/fpdfsdk/include/fsdk_baseannot.h
@@ -114,21 +114,17 @@ class CPDFSDK_Annot {
 class CPDFSDK_BAAnnot : public CPDFSDK_Annot {
  public:
   CPDFSDK_BAAnnot(CPDF_Annot* pAnnot, CPDFSDK_PageView* pPageView);
-  virtual ~CPDFSDK_BAAnnot() {}
-
-  virtual FX_BOOL IsXFAField();
-
-  virtual CFX_ByteString GetType() const;
-  virtual CFX_ByteString GetSubType() const;
-
-  virtual void SetRect(const CPDF_Rect& rect);
-  virtual CPDF_Rect GetRect() const;
-
-  virtual CPDF_Annot* GetPDFAnnot() const;
-
-  virtual void Annot_OnDraw(CFX_RenderDevice* pDevice,
-                            CPDF_Matrix* pUser2Device,
-                            CPDF_RenderOptions* pOptions);
+  ~CPDFSDK_BAAnnot() override {}
+
+  FX_BOOL IsXFAField() override;
+  CFX_ByteString GetType() const override;
+  CFX_ByteString GetSubType() const override;
+  void SetRect(const CPDF_Rect& rect) override;
+  CPDF_Rect GetRect() const override;
+  CPDF_Annot* GetPDFAnnot() const override;
+  void Annot_OnDraw(CFX_RenderDevice* pDevice,
+                    CPDF_Matrix* pUser2Device,
+                    CPDF_RenderOptions* pOptions) override;
 
   CPDF_Dictionary* GetAnnotDict() const;
 
diff --git a/fpdfsdk/include/fxedit/fxet_edit.h b/fpdfsdk/include/fxedit/fxet_edit.h
index 21ebe6bae1..1ecb70426f 100644
--- a/fpdfsdk/include/fxedit/fxet_edit.h
+++ b/fpdfsdk/include/fxedit/fxet_edit.h
@@ -814,16 +814,21 @@ class CFX_Edit_Iterator : public IFX_Edit_Iterator {
 class CFX_Edit_Provider : public IPDF_VariableText_Provider {
  public:
   CFX_Edit_Provider(IFX_Edit_FontMap* pFontMap);
-  virtual ~CFX_Edit_Provider();
+  ~CFX_Edit_Provider() override;
 
   IFX_Edit_FontMap* GetFontMap();
 
-  int32_t GetCharWidth(int32_t nFontIndex, FX_WORD word, int32_t nWordStyle);
-  int32_t GetTypeAscent(int32_t nFontIndex);
-  int32_t GetTypeDescent(int32_t nFontIndex);
-  int32_t GetWordFontIndex(FX_WORD word, int32_t charset, int32_t nFontIndex);
-  int32_t GetDefaultFontIndex();
-  FX_BOOL IsLatinWord(FX_WORD word);
+  // IPDF_VariableText_Provider:
+  int32_t GetCharWidth(int32_t nFontIndex,
+                       FX_WORD word,
+                       int32_t nWordStyle) override;
+  int32_t GetTypeAscent(int32_t nFontIndex) override;
+  int32_t GetTypeDescent(int32_t nFontIndex) override;
+  int32_t GetWordFontIndex(FX_WORD word,
+                           int32_t charset,
+                           int32_t nFontIndex) override;
+  int32_t GetDefaultFontIndex() override;
+  FX_BOOL IsLatinWord(FX_WORD word) override;
 
  private:
   IFX_Edit_FontMap* m_pFontMap;
diff --git a/fpdfsdk/include/fxedit/fxet_list.h b/fpdfsdk/include/fxedit/fxet_list.h
index 63c6617cba..2700b92cf0 100644
--- a/fpdfsdk/include/fxedit/fxet_list.h
+++ b/fpdfsdk/include/fxedit/fxet_list.h
@@ -208,40 +208,33 @@ class CLST_ArrayTemplate : public CFX_ArrayTemplate<TYPE> {
 class CFX_List : protected CFX_ListContainer, public IFX_List {
  public:
   CFX_List();
-  virtual ~CFX_List();
+  ~CFX_List() override;
 
- public:
-  virtual void SetFontMap(IFX_Edit_FontMap* pFontMap);
-  virtual void SetFontSize(FX_FLOAT fFontSize);
-
-  virtual CPDF_Rect GetPlateRect() const;
-  virtual CPDF_Rect GetContentRect() const;
-
-  virtual FX_FLOAT GetFontSize() const;
-  virtual IFX_Edit* GetItemEdit(int32_t nIndex) const;
-  virtual int32_t GetCount() const;
-  virtual FX_BOOL IsItemSelected(int32_t nIndex) const;
-  virtual FX_FLOAT GetFirstHeight() const;
-
-  virtual void SetMultipleSel(FX_BOOL bMultiple);
-  virtual FX_BOOL IsMultipleSel() const;
-  virtual FX_BOOL IsValid(int32_t nItemIndex) const;
-  virtual int32_t FindNext(int32_t nIndex, FX_WCHAR nChar) const;
+  // IFX_List:
+  void SetFontMap(IFX_Edit_FontMap* pFontMap) override;
+  void SetFontSize(FX_FLOAT fFontSize) override;
+  CPDF_Rect GetPlateRect() const override;
+  CPDF_Rect GetContentRect() const override;
+  FX_FLOAT GetFontSize() const override;
+  IFX_Edit* GetItemEdit(int32_t nIndex) const override;
+  int32_t GetCount() const override;
+  FX_BOOL IsItemSelected(int32_t nIndex) const override;
+  FX_FLOAT GetFirstHeight() const override;
+  void SetMultipleSel(FX_BOOL bMultiple) override;
+  FX_BOOL IsMultipleSel() const override;
+  FX_BOOL IsValid(int32_t nItemIndex) const override;
+  int32_t FindNext(int32_t nIndex, FX_WCHAR nChar) const override;
+  void Empty() override;
+  CPDF_Rect GetItemRect(int32_t nIndex) const override;
+  int32_t GetItemIndex(const CPDF_Point& point) const override;
+  int32_t GetFirstSelected() const override;
 
  protected:
-  virtual void Empty();
-
   void AddItem(const FX_WCHAR* str);
   virtual void ReArrange(int32_t nItemIndex);
-
-  virtual CPDF_Rect GetItemRect(int32_t nIndex) const;
   CFX_WideString GetItemText(int32_t nIndex) const;
-
   void SetItemSelect(int32_t nItemIndex, FX_BOOL bSelected);
   void SetItemCaret(int32_t nItemIndex, FX_BOOL bCaret);
-
-  virtual int32_t GetItemIndex(const CPDF_Point& point) const;
-  int32_t GetFirstSelected() const;
   int32_t GetLastSelected() const;
   FX_WCHAR Toupper(FX_WCHAR c) const;
 
diff --git a/fpdfsdk/include/pdfwindow/PWL_ComboBox.h b/fpdfsdk/include/pdfwindow/PWL_ComboBox.h
index e29752326c..be0ef0f5e1 100644
--- a/fpdfsdk/include/pdfwindow/PWL_ComboBox.h
+++ b/fpdfsdk/include/pdfwindow/PWL_ComboBox.h
@@ -47,11 +47,11 @@ class CPWL_CBButton : public CPWL_Wnd {
 class CPWL_ComboBox : public CPWL_Wnd {
  public:
   CPWL_ComboBox();
-  ~CPWL_ComboBox() {}
+  ~CPWL_ComboBox() override {}
 
   operator CPWL_Edit*() { return m_pEdit; }
 
-  // CPWL_Wnd
+  // CPWL_Wnd:
   CFX_ByteString GetClassName() const override;
   void OnCreate(PWL_CREATEPARAM& cp) override;
   FX_BOOL OnKeyDown(FX_WORD nChar, FX_DWORD nFlag) override;