content/common/font_config_ipc_linux.h

   1 // Copyright (c) 2012 The Chromium 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 #ifndef CONTENT_COMMON_FONT_CONFIG_IPC_LINUX_H_
   6 #define CONTENT_COMMON_FONT_CONFIG_IPC_LINUX_H_
   7
   8 #include "base/compiler_specific.h"
   9 #include "base/containers/hash_tables.h"
  10 #include "base/synchronization/lock.h"
  11 #include "third_party/skia/include/core/SkStream.h"
  12 #include "third_party/skia/include/core/SkTypeface.h"
  13 #include "third_party/skia/include/ports/SkFontConfigInterface.h"
  14
  15 #include <string>
  16
  17 class SkString;
  18
  19 namespace content {
  20
  21 // FontConfig implementation for Skia that proxies out of process to get out
  22 // of the sandbox. See http://code.google.com/p/chromium/wiki/LinuxSandboxIPC
  23 class FontConfigIPC : public SkFontConfigInterface {
  24  public:
  25   explicit FontConfigIPC(int fd);
  26   ~FontConfigIPC() override;
  27
  28   bool matchFamilyName(const char familyName[],
  29                        SkTypeface::Style requested,
  30                        FontIdentity* outFontIdentifier,
  31                        SkString* outFamilyName,
  32                        SkTypeface::Style* outStyle) override;
  33
  34   SkStreamAsset* openStream(const FontIdentity&) override;
  35
  36   enum Method {
  37     METHOD_MATCH = 0,
  38     METHOD_OPEN = 1,
  39   };
  40
  41   enum {
  42     kMaxFontFamilyLength = 2048
  43   };
  44
  45  private:
  46   class MappedFontFile;
  47
  48   // Removes |mapped_font_file| from |mapped_font_files_|.
  49   // Does not delete the passed-in object.
  50   void RemoveMappedFontFile(MappedFontFile* mapped_font_file);
  51
  52   const int fd_;
  53   // Lock preventing multiple threads from opening font file and accessing
  54   // |mapped_font_files_| map at the same time.
  55   base::Lock lock_;
  56   // Maps font identity ID to the memory-mapped file with font data.
  57   base::hash_map<uint32_t, MappedFontFile*> mapped_font_files_;
  58 };
  59
  60 }  // namespace content
  61
  62 #endif  // CONTENT_COMMON_FONT_CONFIG_IPC_LINUX_H_