Use smart pointers for class owned pointers under xfa/fde

xfa/fde/fde_render.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/fde/fde_render.h"
 
 #include "xfa/fde/fde_gedevice.h"
 #include "xfa/fde/fde_object.h"
 #include "xfa/fgas/crt/fgas_memory.h"
 
 #define FDE_PATHRENDER_Stroke 1
 #define FDE_PATHRENDER_Fill 2
 
 CFDE_RenderContext::CFDE_RenderContext()
     : m_eStatus(FDE_RENDERSTATUS_Reset),
       m_pRenderDevice(nullptr),
-      m_Transform(),
-      m_pCharPos(nullptr),
-      m_iCharPosCount(0) {
+      m_Transform() {
   m_Transform.SetIdentity();
 }
 
 CFDE_RenderContext::~CFDE_RenderContext() {
   StopRender();
 }
 
 FX_BOOL CFDE_RenderContext::StartRender(CFDE_RenderDevice* pRenderDevice,
                                         IFDE_CanvasSet* pCanvasSet,
                                         const CFX_Matrix& tmDoc2Device) {
@@ skipping 62 matching lines @@
   }
   return m_eStatus = eStatus;
 }
 
 void CFDE_RenderContext::StopRender() {
   m_eStatus = FDE_RENDERSTATUS_Reset;
   m_pRenderDevice = nullptr;
   m_Transform.SetIdentity();
   m_pIterator.reset();
   m_pBrush.reset();
-  FX_Free(m_pCharPos);
-  m_pCharPos = nullptr;
-  m_iCharPosCount = 0;
+  m_CharPos.clear();
 }
 
 void CFDE_RenderContext::RenderText(IFDE_TextSet* pTextSet,
                                     FDE_TEXTEDITPIECE* pText) {
   ASSERT(m_pRenderDevice);
   ASSERT(pTextSet && pText);
 
   CFGAS_GEFont* pFont = pTextSet->GetFont();
   if (!pFont)
     return;
 
   int32_t iCount = pTextSet->GetDisplayPos(pText, nullptr, FALSE);
   if (iCount < 1)
     return;
 
   if (!m_pBrush)
     m_pBrush.reset(new CFDE_Brush);
 
-  if (!m_pCharPos)
-    m_pCharPos = FX_Alloc(FXTEXT_CHARPOS, iCount);
-  else if (m_iCharPosCount < iCount)
-    m_pCharPos = FX_Realloc(FXTEXT_CHARPOS, m_pCharPos, iCount);
+  if (m_CharPos.size() < static_cast<size_t>(iCount))
+    m_CharPos.resize(iCount, FXTEXT_CHARPOS());
 
-  if (m_iCharPosCount < iCount)
-    m_iCharPosCount = iCount;
-
-  iCount = pTextSet->GetDisplayPos(pText, m_pCharPos, FALSE);
+  iCount = pTextSet->GetDisplayPos(pText, m_CharPos.data(), FALSE);
   FX_FLOAT fFontSize = pTextSet->GetFontSize();
   FX_ARGB dwColor = pTextSet->GetFontColor();
   m_pBrush->SetColor(dwColor);
-  m_pRenderDevice->DrawString(m_pBrush.get(), pFont, m_pCharPos, iCount,
+  m_pRenderDevice->DrawString(m_pBrush.get(), pFont, m_CharPos.data(), iCount,
                               fFontSize, &m_Transform);
 }