Get rid of most instance of 'foo == NULL'

core/src/fpdfapi/fpdf_page/fpdf_page_graph_state.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 "pageint.h"
 
 #include "core/include/fpdfapi/fpdf_module.h"
 #include "core/include/fpdfapi/fpdf_page.h"
@@ skipping 85 matching lines @@
       rect.Intersect(path_rect);
     }
     bStarted = TRUE;
   }
   count = GetTextCount();
   if (count) {
     CPDF_Rect layer_rect;
     FX_BOOL bLayerStarted = FALSE;
     for (int i = 0; i < count; i++) {
       CPDF_TextObject* pTextObj = GetText(i);
-      if (pTextObj == NULL) {
+      if (!pTextObj) {
         if (!bStarted) {
           rect = layer_rect;
           bStarted = TRUE;
         } else {
           rect.Intersect(layer_rect);
         }
         bLayerStarted = FALSE;
       } else {
         if (!bLayerStarted) {
           layer_rect = pTextObj->GetBBox(NULL);
@@ skipping 513 matching lines @@
       }
     }
   }
   return -1;
 }
 void CPDF_ContentMarkData::AddMark(const CFX_ByteString& name,
                                    CPDF_Dictionary* pDict,
                                    FX_BOOL bDirect) {
   CPDF_ContentMarkItem& item = m_Marks.Add();
   item.SetName(name);
-  if (pDict == NULL) {
+  if (!pDict) {
     return;
   }
   item.SetParam(bDirect ? CPDF_ContentMarkItem::DirectDict
                         : CPDF_ContentMarkItem::PropertiesDict,
                 bDirect ? pDict->Clone() : pDict);
 }
 void CPDF_ContentMarkData::DeleteLastMark() {
   int size = m_Marks.GetSize();
   if (size == 0) {
     return;
   }
   m_Marks.RemoveAt(size - 1);
 }
 FX_BOOL CPDF_ContentMark::HasMark(const CFX_ByteStringC& mark) const {
-  if (m_pObject == NULL) {
+  if (!m_pObject) {
     return FALSE;
   }
   for (int i = 0; i < m_pObject->CountItems(); i++) {
     CPDF_ContentMarkItem& item = m_pObject->GetItem(i);
     if (item.GetName() == mark) {
       return TRUE;
     }
   }
   return FALSE;
 }
 FX_BOOL CPDF_ContentMark::LookupMark(const CFX_ByteStringC& mark,
                                      CPDF_Dictionary*& pDict) const {
-  if (m_pObject == NULL) {
+  if (!m_pObject) {
     return FALSE;
   }
   for (int i = 0; i < m_pObject->CountItems(); i++) {
     CPDF_ContentMarkItem& item = m_pObject->GetItem(i);
     if (item.GetName() == mark) {
       pDict = NULL;
       if (item.GetParamType() == CPDF_ContentMarkItem::PropertiesDict ||
           item.GetParamType() == CPDF_ContentMarkItem::DirectDict) {
         pDict = ToDictionary(static_cast<CPDF_Object*>(item.GetParam()));
       }
       return TRUE;
     }
   }
   return FALSE;
 }