Reland of Fix leaked internal font

xfa/fgas/font/fgas_gefont.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/fgas/font/fgas_gefont.h"
 
 #include "core/fxge/include/cfx_substfont.h"
 #include "core/fxge/include/cfx_unicodeencoding.h"
@@ skipping 16 matching lines @@
   CFGAS_GEFont* pFont = new CFGAS_GEFont(pFontMgr);
   if (!pFont->LoadFontInternal(pszFontFamily, dwFontStyles, wCodePage)) {
     pFont->Release();
     return nullptr;
   }
   return pFont;
 #endif
 }
 
 // static
-CFGAS_GEFont* CFGAS_GEFont::LoadFont(CFX_Font* pExtFont,
+CFGAS_GEFont* CFGAS_GEFont::LoadFont(CFX_Font* pExternalFont,
                                      IFGAS_FontMgr* pFontMgr) {
   CFGAS_GEFont* pFont = new CFGAS_GEFont(pFontMgr);
-  if (!pFont->LoadFontInternal(pExtFont)) {
+  if (!pFont->LoadFontInternal(pExternalFont)) {
     pFont->Release();
     return nullptr;
   }
+  return pFont;
+}
+
+// static
+CFGAS_GEFont* CFGAS_GEFont::LoadFont(std::unique_ptr<CFX_Font> pInternalFont,
+                                     IFGAS_FontMgr* pFontMgr) {
+  CFGAS_GEFont* pFont = new CFGAS_GEFont(pFontMgr);
+  if (!pFont->LoadFontInternal(std::move(pInternalFont))) {
+    pFont->Release();
+    return nullptr;
+  }
   return pFont;
 }
 
 #if _FXM_PLATFORM_ == _FXM_PLATFORM_WINDOWS_
 // static
 CFGAS_GEFont* CFGAS_GEFont::LoadFont(const uint8_t* pBuffer,
                                      int32_t iLength,
                                      IFGAS_FontMgr* pFontMgr) {
   CFGAS_GEFont* pFont = new CFGAS_GEFont(pFontMgr);
   if (!pFont->LoadFontInternal(pBuffer, iLength)) {
@@ skipping 19 matching lines @@
 CFGAS_GEFont::CFGAS_GEFont(IFGAS_FontMgr* pFontMgr)
     :
 #if _FXM_PLATFORM_ != _FXM_PLATFORM_WINDOWS_
       m_bUseLogFontStyle(FALSE),
       m_dwLogFontStyle(0),
 #endif
       m_pFont(nullptr),
       m_pSrcFont(nullptr),
       m_pFontMgr(pFontMgr),
       m_iRefCount(1),
-      m_bExtFont(FALSE),
+      m_bExternalFont(false),
       m_pProvider(nullptr) {
 }
 
 CFGAS_GEFont::CFGAS_GEFont(CFGAS_GEFont* src, uint32_t dwFontStyles)
     :
 #if _FXM_PLATFORM_ != _FXM_PLATFORM_WINDOWS_
       m_bUseLogFontStyle(FALSE),
       m_dwLogFontStyle(0),
 #endif
       m_pFont(nullptr),
       m_pSrcFont(src),
       m_pFontMgr(src->m_pFontMgr),
       m_iRefCount(1),
-      m_bExtFont(FALSE),
+      m_bExternalFont(false),
       m_pProvider(nullptr) {
   ASSERT(m_pSrcFont->m_pFont);
   m_pSrcFont->Retain();
   m_pFont = new CFX_Font;
   m_pFont->LoadClone(m_pSrcFont->m_pFont);
   CFX_SubstFont* pSubst = m_pFont->GetSubstFont();
   if (!pSubst) {
     pSubst = new CFX_SubstFont;
     m_pFont->SetSubstFont(std::unique_ptr<CFX_SubstFont>(pSubst));
   }
   pSubst->m_Weight =
       (dwFontStyles & FX_FONTSTYLE_Bold) ? FXFONT_FW_BOLD : FXFONT_FW_NORMAL;
   if (dwFontStyles & FX_FONTSTYLE_Italic) {
     pSubst->m_SubstFlags |= FXFONT_SUBST_ITALIC;
   }
   InitFont();
 }
 
 CFGAS_GEFont::~CFGAS_GEFont() {
   for (int32_t i = 0; i < m_SubstFonts.GetSize(); i++)
     m_SubstFonts[i]->Release();
 
   m_SubstFonts.RemoveAll();
   m_FontMapper.clear();
 
-  if (!m_bExtFont)
+  if (!m_bExternalFont)
     delete m_pFont;
 
   // If it is a shallow copy of another source font,
   // decrease the refcount of the source font.
   if (m_pSrcFont)
     m_pSrcFont->Release();
 }
 
 void CFGAS_GEFont::Release() {
   if (--m_iRefCount < 1) {
@@ skipping 76 matching lines @@
 
   m_pFileRead.reset(FX_CreateFileRead(pFontStream, FALSE));
   m_pFont = new CFX_Font;
   if (m_pFont->LoadFile(m_pFileRead.get()))
     return InitFont();
   m_pFileRead.reset();
   return FALSE;
 }
 #endif  // _FXM_PLATFORM_ == _FXM_PLATFORM_WINDOWS_
 
-FX_BOOL CFGAS_GEFont::LoadFontInternal(CFX_Font* pExtFont) {
-  if (m_pFont || !pExtFont) {
+FX_BOOL CFGAS_GEFont::LoadFontInternal(CFX_Font* pExternalFont) {
+  if (m_pFont || !pExternalFont)
     return FALSE;
-  }
-  m_pFont = pExtFont;
-  m_bExtFont = TRUE;
+
+  m_pFont = pExternalFont;
+  m_bExternalFont = true;
   return InitFont();
 }
 
+FX_BOOL CFGAS_GEFont::LoadFontInternal(
+    std::unique_ptr<CFX_Font> pInternalFont) {
+  if (m_pFont || !pInternalFont)
+    return FALSE;
+
+  m_pFont = pInternalFont.release();
+  m_bExternalFont = false;
+  return InitFont();
+}
+
 FX_BOOL CFGAS_GEFont::InitFont() {
   if (!m_pFont)
     return FALSE;
   if (!m_pFontEncoding) {
     m_pFontEncoding.reset(FX_CreateFontEncodingEx(m_pFont));
     if (!m_pFontEncoding)
       return FALSE;
   }
   if (!m_pCharWidthMap)
     m_pCharWidthMap.reset(new CFX_DiscreteArrayTemplate<uint16_t>(1024));
@@ skipping 220 matching lines @@
   }
   if (m_pRectArray) {
     m_pRectArray->RemoveAll(FALSE);
   }
 }
 CFGAS_GEFont* CFGAS_GEFont::GetSubstFont(int32_t iGlyphIndex) const {
   iGlyphIndex = ((uint32_t)iGlyphIndex) >> 24;
   return iGlyphIndex == 0 ? const_cast<CFGAS_GEFont*>(this)
                           : m_SubstFonts[iGlyphIndex - 1];
 }