Use override in more classes in core/

core/src/fxcodec/codec/fx_codec_fax.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/fxcodec/fx_codec.h"
 #include "codec_int.h"
 const uint8_t OneLeadPos[256] = {
     8, 7, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3,
@@ skipping 437 matching lines @@
       _FaxFillBits(dest_buf, columns, startpos, startpos + run_len);
     }
     startpos += run_len;
     if (startpos >= columns) {
       break;
     }
     color = !color;
   }
   return TRUE;
 }
+
 class CCodec_FaxDecoder : public CCodec_ScanlineDecoder {
  public:
   CCodec_FaxDecoder();
-  virtual ~CCodec_FaxDecoder();
+  ~CCodec_FaxDecoder() override;
+
   FX_BOOL Create(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);
-  virtual void v_DownScale(int dest_width, int dest_height) {}
-  virtual FX_BOOL v_Rewind();
-  virtual uint8_t* v_GetNextLine();
-  virtual FX_DWORD GetSrcOffset();
+
+  // CCodec_ScanlineDecoder
+  void v_DownScale(int dest_width, int dest_height) override {}
+  FX_BOOL v_Rewind() override;
+  uint8_t* v_GetNextLine() override;
+  FX_DWORD GetSrcOffset() override;
+
   int m_Encoding, m_bEndOfLine, m_bByteAlign, m_bBlack;
   int bitpos;
   const uint8_t* m_pSrcBuf;
   FX_DWORD m_SrcSize;
   uint8_t* m_pScanlineBuf;
   uint8_t* m_pRefBuf;
 };
+
 CCodec_FaxDecoder::CCodec_FaxDecoder() {
   m_pScanlineBuf = NULL;
   m_pRefBuf = NULL;
 }
 CCodec_FaxDecoder::~CCodec_FaxDecoder() {
   if (m_pScanlineBuf) {
     FX_Free(m_pScanlineBuf);
   }
   if (m_pRefBuf) {
     FX_Free(m_pRefBuf);
@@ skipping 317 matching lines @@
     FX_BOOL EndOfLine,
     FX_BOOL EncodedByteAlign,
     FX_BOOL BlackIs1,
     int Columns,
     int Rows) {
   CCodec_FaxDecoder* pDecoder = new CCodec_FaxDecoder;
   pDecoder->Create(src_buf, src_size, width, height, K, EndOfLine,
                    EncodedByteAlign, BlackIs1, Columns, Rows);
   return pDecoder;
 }