components/font_service/public/cpp/mapped_font_file.h

   1 // Copyright 2015 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 COMPONENTS_FONT_SERVICE_PUBLIC_CPP_MAPPED_FONT_FILE_H_
   6 #define COMPONENTS_FONT_SERVICE_PUBLIC_CPP_MAPPED_FONT_FILE_H_
   7
   8 #include "base/files/file.h"
   9 #include "base/files/memory_mapped_file.h"
  10 #include "base/memory/ref_counted.h"
  11 #include "third_party/skia/include/core/SkStream.h"
  12
  13 namespace font_service {
  14 namespace internal {
  15
  16 // Owns the memory of the mmaped file that we get back from the font_service.
  17 //
  18 // This class is an implementation detail and shouldn't be used by consumers.
  19 class MappedFontFile : public base::RefCountedThreadSafe<MappedFontFile> {
  20  public:
  21   class Observer {
  22    public:
  23     ~Observer() {}
  24
  25     // Called when a MappedFontFile is destroyed.
  26     virtual void OnMappedFontFileDestroyed(MappedFontFile* f) = 0;
  27   };
  28
  29   explicit MappedFontFile(uint32_t font_id);
  30
  31   uint32_t font_id() const { return font_id_; }
  32
  33   void set_observer(Observer* observer) { observer_ = observer; }
  34
  35   bool Initialize(base::File file);
  36
  37   SkMemoryStream* CreateMemoryStream();
  38
  39  private:
  40   friend class base::RefCountedThreadSafe<MappedFontFile>;
  41
  42   ~MappedFontFile();
  43
  44   static void ReleaseProc(const void* ptr, void* context);
  45
  46   uint32_t font_id_;
  47   base::MemoryMappedFile mapped_font_file_;
  48   Observer* observer_;
  49 };
  50
  51 }  // namespace internal
  52 }  // namespace font_service
  53
  54 #endif  // COMPONENTS_FONT_SERVICE_PUBLIC_CPP_MAPPED_FONT_FILE_H_