Properly ref-count CFGAS_GEFont with CFX_RetainPtr.

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 "third_party/base/ptr_util.h"
 #include "xfa/fde/fde_gedevice.h"
@@ skipping 90 matching lines @@
   m_pIterator.reset();
   m_pBrush.reset();
   m_CharPos.clear();
 }
 
 void CFDE_RenderContext::RenderText(IFDE_TextSet* pTextSet,
                                     FDE_TEXTEDITPIECE* pText) {
   ASSERT(m_pRenderDevice);
   ASSERT(pTextSet && pText);
 
-  CFGAS_GEFont* pFont = pTextSet->GetFont();
+  CFX_RetainPtr<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 = pdfium::MakeUnique<CFDE_Brush>();
 
   if (m_CharPos.size() < static_cast<size_t>(iCount))
     m_CharPos.resize(iCount, FXTEXT_CHARPOS());
 
   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_CharPos.data(), iCount,
                               fFontSize, &m_Transform);
 }