Remove CFX_CountRef::IsNull in favor of operator bool

core/fpdfapi/fpdf_page/fpdf_page_parser.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/fpdfapi/fpdf_page/pageint.h"
 
 #include <memory>
 #include <utility>
@@ skipping 790 matching lines @@
   CPDF_ImageObject* pRet = pImageObj.get();
   m_pObjectHolder->GetPageObjectList()->push_back(std::move(pImageObj));
   return pRet;
 }
 
 void CPDF_StreamContentParser::Handle_MarkPlace_Dictionary() {}
 
 void CPDF_StreamContentParser::Handle_EndImage() {}
 
 void CPDF_StreamContentParser::Handle_EndMarkedContent() {
-  if (m_CurContentMark.IsNull())
+  if (!m_CurContentMark)
     return;
 
   int count = m_CurContentMark.GetObject()->CountItems();
   if (count == 1) {
     m_CurContentMark.SetNull();
     return;
   }
   m_CurContentMark.GetModify()->DeleteLastMark();
 }
 
@@ skipping 274 matching lines @@
 
   if (!pShading->IsShadingObject() || !pShading->Load())
     return;
 
   std::unique_ptr<CPDF_ShadingObject> pObj(new CPDF_ShadingObject);
   pObj->m_pShading = pShading;
   SetGraphicStates(pObj.get(), FALSE, FALSE, FALSE);
   pObj->m_Matrix = m_pCurStates->m_CTM;
   pObj->m_Matrix.Concat(m_mtContentToUser);
   CFX_FloatRect bbox =
-      pObj->m_ClipPath.IsNull() ? m_BBox : pObj->m_ClipPath.GetClipBox();
+      pObj->m_ClipPath ? pObj->m_ClipPath.GetClipBox() : m_BBox;
   if (pShading->IsMeshShading())
     bbox.Intersect(GetShadingBBox(pShading, pObj->m_Matrix));
   pObj->m_Left = bbox.left;
   pObj->m_Right = bbox.right;
   pObj->m_Top = bbox.top;
   pObj->m_Bottom = bbox.bottom;
   m_pObjectHolder->GetPageObjectList()->push_back(std::move(pObj));
 }
 
 void CPDF_StreamContentParser::Handle_SetCharSpace() {
@@ skipping 568 matching lines @@
         } else {
           PDF_ReplaceAbbr(pElement);
         }
       }
       break;
     }
     default:
       break;
   }
 }