Cleanup CPDFXFA_Page.

fpdfsdk/fpdfxfa/fpdfxfa_page.cpp

Index: fpdfsdk/fpdfxfa/fpdfxfa_page.cpp
diff --git a/fpdfsdk/fpdfxfa/fpdfxfa_page.cpp b/fpdfsdk/fpdfxfa/fpdfxfa_page.cpp
index 8179db5c11d2a5635239eb095b4c7e63f08a4291..8c0d6bbf98442e0c4b0d184eac655834282014f0 100644
--- a/fpdfsdk/fpdfxfa/fpdfxfa_page.cpp
+++ b/fpdfsdk/fpdfxfa/fpdfxfa_page.cpp
@@ -16,22 +16,15 @@
 #include "xfa/fxfa/include/xfa_ffpageview.h"
 
 CPDFXFA_Page::CPDFXFA_Page(CPDFXFA_Document* pDoc, int page_index)
-    : m_pPDFPage(NULL),
-      m_pXFAPageView(NULL),
-      m_iPageIndex(page_index),
+    : m_pXFAPageView(nullptr),
       m_pDocument(pDoc),
+      m_iPageIndex(page_index),
       m_iRef(1) {}
 
-CPDFXFA_Page::~CPDFXFA_Page() {
-  if (m_pPDFPage)
-    delete m_pPDFPage;
-  m_pPDFPage = NULL;
-  m_pXFAPageView = NULL;
-}
+CPDFXFA_Page::~CPDFXFA_Page() {}
 
 void CPDFXFA_Page::Release() {
-  m_iRef--;
-  if (m_iRef > 0)
+  if (--m_iRef > 0)
     return;
 
   if (m_pDocument)
@@ -43,31 +36,27 @@ void CPDFXFA_Page::Release() {
 FX_BOOL CPDFXFA_Page::LoadPDFPage() {
   if (!m_pDocument)
     return FALSE;
+
   CPDF_Document* pPDFDoc = m_pDocument->GetPDFDoc();
-  if (pPDFDoc) {
-    CPDF_Dictionary* pDict = pPDFDoc->GetPage(m_iPageIndex);
-    if (pDict == NULL)
-      return FALSE;
-    if (m_pPDFPage) {
-      if (m_pPDFPage->m_pFormDict == pDict)
-        return TRUE;
+  if (!pPDFDoc)
+    return FALSE;
 
-      delete m_pPDFPage;
-      m_pPDFPage = NULL;
-    }
+  CPDF_Dictionary* pDict = pPDFDoc->GetPage(m_iPageIndex);
+  if (!pDict)
+    return FALSE;
 
-    m_pPDFPage = new CPDF_Page;
+  if (!m_pPDFPage || m_pPDFPage->m_pFormDict != pDict) {
+    m_pPDFPage.reset(new CPDF_Page);
     m_pPDFPage->Load(pPDFDoc, pDict);
     m_pPDFPage->ParseContent(nullptr);
-    return TRUE;
   }
-
-  return FALSE;
+  return TRUE;
 }
 
 FX_BOOL CPDFXFA_Page::LoadXFAPageView() {
   if (!m_pDocument)
     return FALSE;
+
   CXFA_FFDoc* pXFADoc = m_pDocument->GetXFADoc();
   if (!pXFADoc)
     return FALSE;
@@ -80,11 +69,7 @@ FX_BOOL CPDFXFA_Page::LoadXFAPageView() {
   if (!pPageView)
     return FALSE;
 
-  if (m_pXFAPageView == pPageView)
-    return TRUE;
-
   m_pXFAPageView = pPageView;
-  (void)m_pXFAPageView->LoadPageView(nullptr);
   return TRUE;
 }
 
@@ -110,17 +95,13 @@ FX_BOOL CPDFXFA_Page::LoadPDFPage(CPDF_Dictionary* pageDict) {
   if (!m_pDocument || m_iPageIndex < 0 || !pageDict)
     return FALSE;
 
-  if (m_pPDFPage)
-    delete m_pPDFPage;
-
-  m_pPDFPage = new CPDF_Page();
+  m_pPDFPage.reset(new CPDF_Page());
   m_pPDFPage->Load(m_pDocument->GetPDFDoc(), pageDict);
   m_pPDFPage->ParseContent(nullptr);
-
   return TRUE;
 }
 
-FX_FLOAT CPDFXFA_Page::GetPageWidth() {
+FX_FLOAT CPDFXFA_Page::GetPageWidth() const {
   if (!m_pPDFPage && !m_pXFAPageView)
     return 0.0f;
 
@@ -145,7 +126,7 @@ FX_FLOAT CPDFXFA_Page::GetPageWidth() {
   return 0.0f;
 }
 
-FX_FLOAT CPDFXFA_Page::GetPageHeight() {
+FX_FLOAT CPDFXFA_Page::GetPageHeight() const {
   if (!m_pPDFPage && !m_pXFAPageView)
     return 0.0f;