Get rid of NULLs in core/

core/fxge/dib/fx_dib_transform.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 "core/fxge/dib/dib_int.h"
 
 #include "core/fxge/include/fx_dib.h"
 
@@ skipping 164 matching lines @@
   }
 };
 CFX_DIBitmap* CFX_DIBSource::SwapXY(FX_BOOL bXFlip,
                                     FX_BOOL bYFlip,
                                     const FX_RECT* pDestClip) const {
   FX_RECT dest_clip(0, 0, m_Height, m_Width);
   if (pDestClip) {
     dest_clip.Intersect(*pDestClip);
   }
   if (dest_clip.IsEmpty()) {
-    return NULL;
+    return nullptr;
   }
   CFX_DIBitmap* pTransBitmap = new CFX_DIBitmap;
   int result_height = dest_clip.Height(), result_width = dest_clip.Width();
   if (!pTransBitmap->Create(result_width, result_height, GetFormat())) {
     delete pTransBitmap;
-    return NULL;
+    return nullptr;
   }
   pTransBitmap->CopyPalette(m_pPalette);
   int dest_pitch = pTransBitmap->GetPitch();
   uint8_t* dest_buf = pTransBitmap->GetBuffer();
   int row_start = bXFlip ? m_Height - dest_clip.right : dest_clip.left;
   int row_end = bXFlip ? m_Height - dest_clip.left : dest_clip.right;
   int col_start = bYFlip ? m_Width - dest_clip.bottom : dest_clip.top;
   int col_end = bYFlip ? m_Width - dest_clip.top : dest_clip.bottom;
   if (GetBPP() == 1) {
     FXSYS_memset(dest_buf, 0xff, dest_pitch * result_height);
@@ skipping 744 matching lines @@
       }
     }
   }
   m_Storer.Replace(std::move(pTransformed));
   return FALSE;
 }
 
 std::unique_ptr<CFX_DIBitmap> CFX_ImageTransformer::DetachBitmap() {
   return m_Storer.Detach();
 }