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1 // Copyright 2016 PDFium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4 
5 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
6 
7 #include "core/fxge/cfx_fontcache.h"
8 
9 #include <memory>
10 #include <utility>
11 
12 #include "core/fxge/cfx_facecache.h"
13 #include "core/fxge/fx_font.h"
14 #include "core/fxge/fx_freetype.h"
15 #include "third_party/base/ptr_util.h"
16 
CountedFaceCache()17 CFX_FontCache::CountedFaceCache::CountedFaceCache() {}
18 
~CountedFaceCache()19 CFX_FontCache::CountedFaceCache::~CountedFaceCache() {}
20 
CFX_FontCache()21 CFX_FontCache::CFX_FontCache() {}
22 
~CFX_FontCache()23 CFX_FontCache::~CFX_FontCache() {
24   ASSERT(m_ExtFaceMap.empty());
25   ASSERT(m_FTFaceMap.empty());
26 }
27 
GetCachedFace(const CFX_Font * pFont)28 CFX_FaceCache* CFX_FontCache::GetCachedFace(const CFX_Font* pFont) {
29   FXFT_Face face = pFont->GetFace();
30   const bool bExternal = !face;
31   CFX_FTCacheMap& map = bExternal ? m_ExtFaceMap : m_FTFaceMap;
32   auto it = map.find(face);
33   if (it != map.end()) {
34     CountedFaceCache* counted_face_cache = it->second.get();
35     counted_face_cache->m_nCount++;
36     return counted_face_cache->m_Obj.get();
37   }
38 
39   auto counted_face_cache = pdfium::MakeUnique<CountedFaceCache>();
40   counted_face_cache->m_nCount = 2;
41   auto new_cache =
42       pdfium::MakeUnique<CFX_FaceCache>(bExternal ? nullptr : face);
43   CFX_FaceCache* face_cache = new_cache.get();
44   counted_face_cache->m_Obj = std::move(new_cache);
45   map[face] = std::move(counted_face_cache);
46   return face_cache;
47 }
48 
49 #ifdef _SKIA_SUPPORT_
GetDeviceCache(const CFX_Font * pFont)50 CFX_TypeFace* CFX_FontCache::GetDeviceCache(const CFX_Font* pFont) {
51   return GetCachedFace(pFont)->GetDeviceCache(pFont);
52 }
53 #endif
54 
ReleaseCachedFace(const CFX_Font * pFont)55 void CFX_FontCache::ReleaseCachedFace(const CFX_Font* pFont) {
56   FXFT_Face face = pFont->GetFace();
57   const bool bExternal = !face;
58   CFX_FTCacheMap& map = bExternal ? m_ExtFaceMap : m_FTFaceMap;
59 
60   auto it = map.find(face);
61   if (it == map.end())
62     return;
63 
64   CountedFaceCache* counted_face_cache = it->second.get();
65   if (counted_face_cache->m_nCount > 2) {
66     counted_face_cache->m_nCount--;
67   } else {
68     map.erase(it);
69   }
70 }
71