Refactor CFX_FontCache to have only one in GE Module.

After this CL: only one global CFX_FontCache used. Any cached items
from it, are released, when they are not being used.

This is restore part of reverted CL:
Original CL: https://codereview.chromium.org/2158023002
Revert reason: BUG=647612
Fix bug CL: https://codereview.chromium.org/2350193003

Review-Url: https://codereview.chromium.org/2350243002

5 files changed, 43 insertions, 26 deletions

diff --git a/core/fxge/include/cfx_facecache.h b/core/fxge/include/cfx_facecache.h
index 6e437b49c3..fc1b28b523 100644
--- a/core/fxge/include/cfx_facecache.h
+++ b/core/fxge/include/cfx_facecache.h
@@ -16,34 +16,34 @@ class CFX_FaceCache {
  public:
   explicit CFX_FaceCache(FXFT_Face face);
   ~CFX_FaceCache();
-  const CFX_GlyphBitmap* LoadGlyphBitmap(CFX_Font* pFont,
+  const CFX_GlyphBitmap* LoadGlyphBitmap(const CFX_Font* pFont,
                                          uint32_t glyph_index,
                                          FX_BOOL bFontStyle,
                                          const CFX_Matrix* pMatrix,
                                          int dest_width,
                                          int anti_alias,
                                          int& text_flags);
-  const CFX_PathData* LoadGlyphPath(CFX_Font* pFont,
+  const CFX_PathData* LoadGlyphPath(const CFX_Font* pFont,
                                     uint32_t glyph_index,
                                     int dest_width);
 
 #ifdef _SKIA_SUPPORT_
-  CFX_TypeFace* GetDeviceCache(CFX_Font* pFont);
+  CFX_TypeFace* GetDeviceCache(const CFX_Font* pFont);
 #endif
 
  private:
-  CFX_GlyphBitmap* RenderGlyph(CFX_Font* pFont,
+  CFX_GlyphBitmap* RenderGlyph(const CFX_Font* pFont,
                                uint32_t glyph_index,
                                FX_BOOL bFontStyle,
                                const CFX_Matrix* pMatrix,
                                int dest_width,
                                int anti_alias);
-  CFX_GlyphBitmap* RenderGlyph_Nativetext(CFX_Font* pFont,
+  CFX_GlyphBitmap* RenderGlyph_Nativetext(const CFX_Font* pFont,
                                           uint32_t glyph_index,
                                           const CFX_Matrix* pMatrix,
                                           int dest_width,
                                           int anti_alias);
-  CFX_GlyphBitmap* LookUpGlyphBitmap(CFX_Font* pFont,
+  CFX_GlyphBitmap* LookUpGlyphBitmap(const CFX_Font* pFont,
                                      const CFX_Matrix* pMatrix,
                                      const CFX_ByteString& FaceGlyphsKey,
                                      uint32_t glyph_index,
diff --git a/core/fxge/include/cfx_fontcache.h b/core/fxge/include/cfx_fontcache.h
index d4a4dddaa5..dd9a176d19 100644
--- a/core/fxge/include/cfx_fontcache.h
+++ b/core/fxge/include/cfx_fontcache.h
@@ -8,6 +8,7 @@
 #define CORE_FXGE_INCLUDE_CFX_FONTCACHE_H_
 
 #include <map>
+#include <memory>
 
 #include "core/fxcrt/include/fx_system.h"
 #include "core/fxge/include/fx_font.h"
@@ -19,15 +20,21 @@ class CFX_FontCache {
  public:
   CFX_FontCache();
   ~CFX_FontCache();
-  CFX_FaceCache* GetCachedFace(CFX_Font* pFont);
-  void ReleaseCachedFace(CFX_Font* pFont);
-  void FreeCache(FX_BOOL bRelease = FALSE);
+  CFX_FaceCache* GetCachedFace(const CFX_Font* pFont);
+  void ReleaseCachedFace(const CFX_Font* pFont);
 #ifdef _SKIA_SUPPORT_
-  CFX_TypeFace* GetDeviceCache(CFX_Font* pFont);
+  CFX_TypeFace* GetDeviceCache(const CFX_Font* pFont);
 #endif
 
  private:
-  using CFX_FTCacheMap = std::map<FXFT_Face, CFX_CountedFaceCache*>;
+  struct CountedFaceCache {
+    CountedFaceCache();
+    ~CountedFaceCache();
+    std::unique_ptr<CFX_FaceCache> m_Obj;
+    uint32_t m_nCount;
+  };
+
+  using CFX_FTCacheMap = std::map<FXFT_Face, std::unique_ptr<CountedFaceCache>>;
   CFX_FTCacheMap m_FTFaceMap;
   CFX_FTCacheMap m_ExtFaceMap;
 };
diff --git a/core/fxge/include/cfx_renderdevice.h b/core/fxge/include/cfx_renderdevice.h
index 9ca9a07220..3b9c93fc9b 100644
--- a/core/fxge/include/cfx_renderdevice.h
+++ b/core/fxge/include/cfx_renderdevice.h
@@ -14,7 +14,6 @@
 #include "core/fxge/include/fx_font.h"
 
 class CFX_Font;
-class CFX_FontCache;
 class CFX_GraphStateData;
 class IFX_RenderDeviceDriver;
 
@@ -208,7 +207,6 @@ class CFX_RenderDevice {
   FX_BOOL DrawNormalText(int nChars,
                          const FXTEXT_CHARPOS* pCharPos,
                          CFX_Font* pFont,
-                         CFX_FontCache* pCache,
                          FX_FLOAT font_size,
                          const CFX_Matrix* pText2Device,
                          uint32_t fill_color,
@@ -216,7 +214,6 @@ class CFX_RenderDevice {
   FX_BOOL DrawTextPath(int nChars,
                                 const FXTEXT_CHARPOS* pCharPos,
                                 CFX_Font* pFont,
-                                CFX_FontCache* pCache,
                                 FX_FLOAT font_size,
                                 const CFX_Matrix* pText2User,
                                 const CFX_Matrix* pUser2Device,
diff --git a/core/fxge/include/fx_font.h b/core/fxge/include/fx_font.h
index fc207a60b2..58d12bbb2a 100644
--- a/core/fxge/include/fx_font.h
+++ b/core/fxge/include/fx_font.h
@@ -19,7 +19,7 @@ typedef struct FT_FaceRec_* FXFT_Face;
 typedef void* FXFT_Library;
 
 class CFX_FaceCache;
-class CFX_FontCache;
+class CFX_GlyphBitmap;
 class CFX_PathData;
 class CFX_SizeGlyphCache;
 
@@ -115,13 +115,24 @@ class CFX_Font {
                    int* pFaceCount = nullptr);
 
   FX_BOOL LoadClone(const CFX_Font* pFont);
-  void SetFace(FXFT_Face face) { m_Face = face; }
+  void SetFace(FXFT_Face face);
   void SetSubstFont(std::unique_ptr<CFX_SubstFont> subst) {
     m_pSubstFont = std::move(subst);
   }
 #endif  // PDF_ENABLE_XFA
 
-  CFX_PathData* LoadGlyphPath(uint32_t glyph_index, int dest_width = 0);
+  const CFX_GlyphBitmap* LoadGlyphBitmap(uint32_t glyph_index,
+                                         FX_BOOL bFontStyle,
+                                         const CFX_Matrix* pMatrix,
+                                         int dest_width,
+                                         int anti_alias,
+                                         int& text_flags) const;
+  const CFX_PathData* LoadGlyphPath(uint32_t glyph_index, int dest_width) const;
+
+#ifdef _SKIA_SUPPORT_
+  CFX_TypeFace* GetDeviceCache() const;
+#endif
+
   int GetGlyphWidth(uint32_t glyph_index);
   int GetAscent() const;
   int GetDescent() const;
@@ -148,7 +159,7 @@ class CFX_Font {
 #endif
   uint8_t* GetFontData() const { return m_pFontData; }
   uint32_t GetSize() const { return m_dwSize; }
-  void AdjustMMParams(int glyph_index, int width, int weight);
+  void AdjustMMParams(int glyph_index, int width, int weight) const;
 
   static const size_t kAngleSkewArraySize = 30;
   static const char s_AngleSkew[kAngleSkewArraySize];
@@ -165,10 +176,20 @@ class CFX_Font {
 #endif  // PDF_ENABLE_XFA
 
  private:
+  friend class CFX_FaceCache;
+  CFX_PathData* LoadGlyphPathImpl(uint32_t glyph_index,
+                                  int dest_width = 0) const;
+
+ private:
+  CFX_FaceCache* GetFaceCache() const;
+
   void ReleasePlatformResource();
   void DeleteFace();
 
+  void ClearFaceCache();
+
   FXFT_Face m_Face;
+  mutable CFX_FaceCache* m_FaceCache;  // not owned.
   std::unique_ptr<CFX_SubstFont> m_pSubstFont;
   std::vector<uint8_t> m_pFontDataAllocation;
   uint8_t* m_pFontData;
@@ -198,12 +219,6 @@ class CFX_FontFaceInfo {
   uint32_t m_Charsets;
 };
 
-class CFX_CountedFaceCache {
- public:
-  CFX_FaceCache* m_Obj;
-  uint32_t m_nCount;
-};
-
 class CFX_GlyphBitmap {
  public:
   int m_Top;
diff --git a/core/fxge/include/ifx_renderdevicedriver.h b/core/fxge/include/ifx_renderdevicedriver.h
index 8b20cf0838..e9dbed913a 100644
--- a/core/fxge/include/ifx_renderdevicedriver.h
+++ b/core/fxge/include/ifx_renderdevicedriver.h
@@ -12,7 +12,6 @@
 class CFX_DIBitmap;
 class CFX_DIBSource;
 class CFX_Font;
-class CFX_FontCache;
 class CFX_GraphStateData;
 class CFX_Matrix;
 class CFX_PathData;
@@ -87,7 +86,6 @@ class IFX_RenderDeviceDriver {
   virtual FX_BOOL DrawDeviceText(int nChars,
                                  const FXTEXT_CHARPOS* pCharPos,
                                  CFX_Font* pFont,
-                                 CFX_FontCache* pCache,
                                  const CFX_Matrix* pObject2Device,
                                  FX_FLOAT font_size,
                                  uint32_t color);