Fix memory leaking on ClosePage.chromium/2862

CFX_FontCache refactoring:
  after this CL: Only one global CFX_FontCache used. Any cached items from it, are released, when its are not used.

BUG=79367,48791

The fonts was not cleared after unloading pages.

Test pdf:

http://www.nasa.gov/pdf/750614main_NASA_FY_2014_Budget_Estimates-508.pdf

For this file, we have ~5 fonts per page, which equal ~1 Mb per page.
In this PDF we have 670 pages, as result after slow scrolling(reading) full document we have ~600 Mb fonts data in memory.

memory usage of PDF Plugin:
  before this CL: ~660 Mb
  after this CL: ~100 Mb

Review-Url: https://codereview.chromium.org/2158023002

1 files changed, 19 insertions, 34 deletions

diff --git a/core/fxge/ge/cfx_fontcache.cpp b/core/fxge/ge/cfx_fontcache.cpp
index 3ecd83c33f..acae018c83 100644
--- a/core/fxge/ge/cfx_fontcache.cpp
+++ b/core/fxge/ge/cfx_fontcache.cpp
@@ -10,38 +10,43 @@
 #include "core/fxge/include/fx_font.h"
 #include "core/fxge/include/fx_freetype.h"
 
+CFX_FontCache::CountedFaceCache::CountedFaceCache() {}
+
+CFX_FontCache::CountedFaceCache::~CountedFaceCache() {}
+
 CFX_FontCache::CFX_FontCache() {}
 
 CFX_FontCache::~CFX_FontCache() {
-  FreeCache(TRUE);
+  ASSERT(m_ExtFaceMap.empty());
+  ASSERT(m_FTFaceMap.empty());
 }
 
-CFX_FaceCache* CFX_FontCache::GetCachedFace(CFX_Font* pFont) {
+CFX_FaceCache* CFX_FontCache::GetCachedFace(const CFX_Font* pFont) {
   FXFT_Face face = pFont->GetFace();
   const bool bExternal = !face;
   CFX_FTCacheMap& map = bExternal ? m_ExtFaceMap : m_FTFaceMap;
   auto it = map.find(face);
   if (it != map.end()) {
-    CFX_CountedFaceCache* counted_face_cache = it->second;
+    CountedFaceCache* counted_face_cache = it->second.get();
     counted_face_cache->m_nCount++;
-    return counted_face_cache->m_Obj;
+    return counted_face_cache->m_Obj.get();
   }
 
-  CFX_FaceCache* face_cache = new CFX_FaceCache(bExternal ? nullptr : face);
-  CFX_CountedFaceCache* counted_face_cache = new CFX_CountedFaceCache;
+  std::unique_ptr<CountedFaceCache> counted_face_cache(new CountedFaceCache);
   counted_face_cache->m_nCount = 2;
-  counted_face_cache->m_Obj = face_cache;
-  map[face] = counted_face_cache;
+  CFX_FaceCache* face_cache = new CFX_FaceCache(bExternal ? nullptr : face);
+  counted_face_cache->m_Obj.reset(face_cache);
+  map[face] = std::move(counted_face_cache);
   return face_cache;
 }
 
 #ifdef _SKIA_SUPPORT_
-CFX_TypeFace* CFX_FontCache::GetDeviceCache(CFX_Font* pFont) {
+CFX_TypeFace* CFX_FontCache::GetDeviceCache(const CFX_Font* pFont) {
   return GetCachedFace(pFont)->GetDeviceCache(pFont);
 }
 #endif
 
-void CFX_FontCache::ReleaseCachedFace(CFX_Font* pFont) {
+void CFX_FontCache::ReleaseCachedFace(const CFX_Font* pFont) {
   FXFT_Face face = pFont->GetFace();
   const bool bExternal = !face;
   CFX_FTCacheMap& map = bExternal ? m_ExtFaceMap : m_FTFaceMap;
@@ -50,30 +55,10 @@ void CFX_FontCache::ReleaseCachedFace(CFX_Font* pFont) {
   if (it == map.end())
     return;
 
-  CFX_CountedFaceCache* counted_face_cache = it->second;
-  if (counted_face_cache->m_nCount > 1) {
+  CountedFaceCache* counted_face_cache = it->second.get();
+  if (counted_face_cache->m_nCount > 2) {
     counted_face_cache->m_nCount--;
-  }
-}
-
-void CFX_FontCache::FreeCache(FX_BOOL bRelease) {
-  for (auto it = m_FTFaceMap.begin(); it != m_FTFaceMap.end();) {
-    auto curr_it = it++;
-    CFX_CountedFaceCache* cache = curr_it->second;
-    if (bRelease || cache->m_nCount < 2) {
-      delete cache->m_Obj;
-      delete cache;
-      m_FTFaceMap.erase(curr_it);
-    }
-  }
-
-  for (auto it = m_ExtFaceMap.begin(); it != m_ExtFaceMap.end();) {
-    auto curr_it = it++;
-    CFX_CountedFaceCache* cache = curr_it->second;
-    if (bRelease || cache->m_nCount < 2) {
-      delete cache->m_Obj;
-      delete cache;
-      m_ExtFaceMap.erase(curr_it);
-    }
+  } else {
+    map.erase(it);
   }
 }