Get rid of NULLs in xfa/

xfa/fxfa/app/xfa_ffpushbutton.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 "xfa/fxfa/app/xfa_ffpushbutton.h"
 
 #include "xfa/fwl/core/cfwl_widgetmgr.h"
 #include "xfa/fwl/core/fwl_noteimp.h"
 #include "xfa/fwl/lightwidget/cfwl_pushbutton.h"
 #include "xfa/fxfa/app/xfa_fffield.h"
 #include "xfa/fxfa/app/xfa_ffwidgetacc.h"
 #include "xfa/fxfa/app/xfa_textlayout.h"
 #include "xfa/fxfa/include/xfa_ffapp.h"
 #include "xfa/fxfa/include/xfa_ffpageview.h"
 #include "xfa/fxfa/include/xfa_ffwidget.h"
 #include "xfa/fxgraphics/cfx_color.h"
 #include "xfa/fxgraphics/cfx_path.h"
 
 CXFA_FFPushButton::CXFA_FFPushButton(CXFA_FFPageView* pPageView,
                                      CXFA_WidgetAcc* pDataAcc)
     : CXFA_FFField(pPageView, pDataAcc),
-      m_pRolloverTextLayout(NULL),
-      m_pDownTextLayout(NULL),
-      m_pDownProvider(NULL),
-      m_pRollProvider(NULL),
-      m_pOldDelegate(NULL) {}
+      m_pRolloverTextLayout(nullptr),
+      m_pDownTextLayout(nullptr),
+      m_pDownProvider(nullptr),
+      m_pRollProvider(nullptr),
+      m_pOldDelegate(nullptr) {}
 CXFA_FFPushButton::~CXFA_FFPushButton() {
   CXFA_FFPushButton::UnloadWidget();
 }
 void CXFA_FFPushButton::RenderWidget(CFX_Graphics* pGS,
                                      CFX_Matrix* pMatrix,
                                      uint32_t dwStatus,
                                      int32_t iRotate) {
   if (!IsMatchVisibleStatus(dwStatus)) {
     return;
   }
@@ skipping 94 matching lines @@
 FX_ARGB CXFA_FFPushButton::GetFillColor() {
   return 0xFFFFFFFF;
 }
 void CXFA_FFPushButton::LoadHighlightCaption() {
   CXFA_Caption caption = m_pDataAcc->GetCaption();
   if (caption && caption.GetPresence() != XFA_ATTRIBUTEENUM_Hidden) {
     {
       CFX_WideString wsRollover;
       FX_BOOL bRichText;
       if (m_pDataAcc->GetButtonRollover(wsRollover, bRichText)) {
-        if (m_pRollProvider == NULL) {
+        if (!m_pRollProvider) {
           m_pRollProvider =
               new CXFA_TextProvider(m_pDataAcc, XFA_TEXTPROVIDERTYPE_Rollover);
         }
         m_pRolloverTextLayout = new CXFA_TextLayout(m_pRollProvider);
       }
       CFX_WideString wsDown;
       if (m_pDataAcc->GetButtonDown(wsDown, bRichText)) {
-        if (m_pDownProvider == NULL) {
+        if (!m_pDownProvider) {
           m_pDownProvider =
               new CXFA_TextProvider(m_pDataAcc, XFA_TEXTPROVIDERTYPE_Down);
         }
         m_pDownTextLayout = new CXFA_TextLayout(m_pDownProvider);
       }
     }
   }
 }
 void CXFA_FFPushButton::LayoutHighlightCaption() {
   CFX_SizeF sz(m_rtCaption.width, m_rtCaption.height);
@@ skipping 76 matching lines @@
       pGraphics->SetLineWidth(fLineWidth);
       CFX_Path path;
       path.Create();
       CFX_RectF rect;
       m_pNormalWidget->GetWidgetRect(rect);
       path.AddRectangle(0, 0, rect.width, rect.height);
       pGraphics->StrokePath(&path, (CFX_Matrix*)pMatrix);
     }
   }
 }