Properly ref-count CFGAS_GEFont with CFX_RetainPtr.

We worry about cyclical references, but no leaks found.

Review-Url: https://codereview.chromium.org/2609423003

1 files changed, 32 insertions, 26 deletions

diff --git a/xfa/fgas/font/cfgas_gefont.h b/xfa/fgas/font/cfgas_gefont.h
index 86e5e4c955..962b93fbb5 100644
--- a/xfa/fgas/font/cfgas_gefont.h
+++ b/xfa/fgas/font/cfgas_gefont.h
@@ -9,40 +9,47 @@
 
 #include <map>
 #include <memory>
+#include <vector>
 
+#include "core/fxcrt/cfx_retain_ptr.h"
 #include "core/fxcrt/fx_memory.h"
 #include "xfa/fgas/crt/fgas_utils.h"
 #include "xfa/fgas/font/cfgas_fontmgr.h"
 
 #define FXFONT_SUBST_ITALIC 0x02
 
+class CFGAS_FontMgr;
 class CFX_UnicodeEncoding;
 class CXFA_PDFFontMgr;
 
-class CFGAS_GEFont {
+class CFGAS_GEFont : public CFX_Retainable {
  public:
-  static CFGAS_GEFont* LoadFont(const FX_WCHAR* pszFontFamily,
-                                uint32_t dwFontStyles,
-                                uint16_t wCodePage,
-                                CFGAS_FontMgr* pFontMgr);
-  static CFGAS_GEFont* LoadFont(CFX_Font* pExternalFont,
-                                CFGAS_FontMgr* pFontMgr);
-  static CFGAS_GEFont* LoadFont(std::unique_ptr<CFX_Font> pInternalFont,
-                                CFGAS_FontMgr* pFontMgr);
+  template <typename T, typename... Args>
+  friend CFX_RetainPtr<T> pdfium::MakeRetain(Args&&... args);
+
+  static CFX_RetainPtr<CFGAS_GEFont> LoadFont(const FX_WCHAR* pszFontFamily,
+                                              uint32_t dwFontStyles,
+                                              uint16_t wCodePage,
+                                              CFGAS_FontMgr* pFontMgr);
+  static CFX_RetainPtr<CFGAS_GEFont> LoadFont(CFX_Font* pExternalFont,
+                                              CFGAS_FontMgr* pFontMgr);
+  static CFX_RetainPtr<CFGAS_GEFont> LoadFont(
+      std::unique_ptr<CFX_Font> pInternalFont,
+      CFGAS_FontMgr* pFontMgr);
 #if _FXM_PLATFORM_ == _FXM_PLATFORM_WINDOWS_
-  static CFGAS_GEFont* LoadFont(const uint8_t* pBuffer,
-                                int32_t iLength,
-                                CFGAS_FontMgr* pFontMgr);
-  static CFGAS_GEFont* LoadFont(const CFX_RetainPtr<IFGAS_Stream>& pFontStream,
-                                CFGAS_FontMgr* pFontMgr,
-                                bool bSaveStream);
+  static CFX_RetainPtr<CFGAS_GEFont> LoadFont(const uint8_t* pBuffer,
+                                              int32_t iLength,
+                                              CFGAS_FontMgr* pFontMgr);
+  static CFX_RetainPtr<CFGAS_GEFont> LoadFont(
+      const CFX_RetainPtr<IFGAS_Stream>& pFontStream,
+      CFGAS_FontMgr* pFontMgr,
+      bool bSaveStream);
 #endif
 
-  ~CFGAS_GEFont();
+  ~CFGAS_GEFont() override;
 
-  void Release();
-  CFGAS_GEFont* Retain();
-  CFGAS_GEFont* Derive(uint32_t dwFontStyles, uint16_t wCodePage = 0);
+  CFX_RetainPtr<CFGAS_GEFont> Derive(uint32_t dwFontStyles,
+                                     uint16_t wCodePage = 0);
   uint32_t GetFontStyles() const;
   bool GetCharWidth(FX_WCHAR wUnicode, int32_t& iWidth, bool bCharCode);
   int32_t GetGlyphIndex(FX_WCHAR wUnicode, bool bCharCode = false);
@@ -50,7 +57,7 @@ class CFGAS_GEFont {
   int32_t GetDescent() const;
   bool GetCharBBox(FX_WCHAR wUnicode, CFX_Rect& bbox, bool bCharCode = false);
   bool GetBBox(CFX_Rect& bbox);
-  CFGAS_GEFont* GetSubstFont(int32_t iGlyphIndex) const;
+  CFX_RetainPtr<CFGAS_GEFont> GetSubstFont(int32_t iGlyphIndex) const;
   CFX_Font* GetDevFont() const { return m_pFont; }
   void SetFontProvider(CXFA_PDFFontMgr* pProvider) { m_pProvider = pProvider; }
 #if _FXM_PLATFORM_ != _FXM_PLATFORM_WINDOWS_
@@ -62,7 +69,7 @@ class CFGAS_GEFont {
 
  private:
   explicit CFGAS_GEFont(CFGAS_FontMgr* pFontMgr);
-  CFGAS_GEFont(CFGAS_GEFont* src, uint32_t dwFontStyles);
+  CFGAS_GEFont(const CFX_RetainPtr<CFGAS_GEFont>& src, uint32_t dwFontStyles);
 
 #if _FXM_PLATFORM_ == _FXM_PLATFORM_WINDOWS_
   bool LoadFontInternal(const FX_WCHAR* pszFontFamily,
@@ -85,7 +92,7 @@ class CFGAS_GEFont {
                             bool bCharCode);
   int32_t GetGlyphIndex(FX_WCHAR wUnicode,
                         bool bRecursive,
-                        CFGAS_GEFont** ppFont,
+                        CFX_RetainPtr<CFGAS_GEFont>* ppFont,
                         bool bCharCode = false);
   CFX_WideString GetFamilyName() const;
 
@@ -94,9 +101,8 @@ class CFGAS_GEFont {
   uint32_t m_dwLogFontStyle;
 #endif
   CFX_Font* m_pFont;
-  CFGAS_GEFont* const m_pSrcFont;
+  CFX_RetainPtr<CFGAS_GEFont> m_pSrcFont;  // Only set by ctor, so no cycles.
   CFGAS_FontMgr* const m_pFontMgr;
-  int32_t m_iRefCount;
   bool m_bExternalFont;
   CFX_RetainPtr<IFGAS_Stream> m_pStream;
   CFX_RetainPtr<IFX_SeekableReadStream> m_pFileRead;
@@ -105,8 +111,8 @@ class CFGAS_GEFont {
   std::unique_ptr<CFX_MassArrayTemplate<CFX_Rect>> m_pRectArray;
   std::unique_ptr<CFX_MapPtrToPtr> m_pBBoxMap;
   CXFA_PDFFontMgr* m_pProvider;  // not owned.
-  CFX_ArrayTemplate<CFGAS_GEFont*> m_SubstFonts;
-  std::map<FX_WCHAR, CFGAS_GEFont*> m_FontMapper;
+  std::vector<CFX_RetainPtr<CFGAS_GEFont>> m_SubstFonts;
+  std::map<FX_WCHAR, CFX_RetainPtr<CFGAS_GEFont>> m_FontMapper;
 };
 
 #endif  // XFA_FGAS_FONT_CFGAS_GEFONT_H_