Split fx_font into multiple files, part 1.

Moved classes CFX_FontCache and CFX_AutoFontCache into a separate file.

Review-Url: https://codereview.chromium.org/2246223002

core/fxge/ge/cfx_fontcache.cpp

diff --git a/core/fxge/ge/cfx_fontcache.cpp b/core/fxge/ge/cfx_fontcache.cpp
new file mode 100644
index 0000000..a183711
--- /dev/null
+++ b/core/fxge/ge/cfx_fontcache.cpp
@@ -0,0 +1,78 @@
+// Copyright 2016 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 "core/fxge/include/cfx_fontcache.h"
+
+#include "core/fxge/include/fx_font.h"
+#include "core/fxge/include/fx_freetype.h"
+
+CFX_FontCache::CFX_FontCache() {}
+
+CFX_FontCache::~CFX_FontCache() {
+  FreeCache(TRUE);
+}
+
+CFX_FaceCache* CFX_FontCache::GetCachedFace(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;
+    counted_face_cache->m_nCount++;
+    return counted_face_cache->m_Obj;
+  }
+
+  CFX_FaceCache* face_cache = new CFX_FaceCache(bExternal ? nullptr : face);
+  CFX_CountedFaceCache* counted_face_cache = new CFX_CountedFaceCache;
+  counted_face_cache->m_nCount = 2;
+  counted_face_cache->m_Obj = face_cache;
+  map[face] = counted_face_cache;
+  return face_cache;
+}
+
+#ifdef _SKIA_SUPPORT_
+CFX_TypeFace* CFX_FontCache::GetDeviceCache(CFX_Font* pFont) {
+  return GetCachedFace(pFont)->GetDeviceCache(pFont);
+}
+#endif
+
+void CFX_FontCache::ReleaseCachedFace(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())
+    return;
+
+  CFX_CountedFaceCache* counted_face_cache = it->second;
+  if (counted_face_cache->m_nCount > 1) {
+    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);
+    }
+  }
+}