components/font_service/public/cpp/mapped_font_file.cc

   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 #include "components/font_service/public/cpp/mapped_font_file.h"
   6
   7 #include "base/files/file_util.h"
   8 #include "base/threading/thread_restrictions.h"
   9 #include "skia/ext/refptr.h"
  10 #include "skia/ext/skia_utils_base.h"
  11 #include "third_party/skia/include/core/SkData.h"
  12 #include "third_party/skia/include/core/SkStream.h"
  13
  14 namespace font_service {
  15 namespace internal {
  16
  17 MappedFontFile::MappedFontFile(uint32_t font_id)
  18     : font_id_(font_id), observer_(nullptr) {}
  19
  20 bool MappedFontFile::Initialize(base::File file) {
  21   base::ThreadRestrictions::ScopedAllowIO allow_mmap;
  22   return mapped_font_file_.Initialize(file.Pass());
  23 }
  24
  25 SkMemoryStream* MappedFontFile::CreateMemoryStream() {
  26   DCHECK(mapped_font_file_.IsValid());
  27   auto data = skia::AdoptRef(
  28       SkData::NewWithProc(mapped_font_file_.data(), mapped_font_file_.length(),
  29                           &MappedFontFile::ReleaseProc, this));
  30   if (!data)
  31     return nullptr;
  32   AddRef();
  33   return new SkMemoryStream(data.get());
  34 }
  35
  36 MappedFontFile::~MappedFontFile() {
  37   if (observer_)
  38     observer_->OnMappedFontFileDestroyed(this);
  39 }
  40
  41 // static
  42 void MappedFontFile::ReleaseProc(const void* ptr, void* context) {
  43   base::ThreadRestrictions::ScopedAllowIO allow_munmap;
  44   static_cast<MappedFontFile*>(context)->Release();
  45 }
  46
  47 }  // namespace internal
  48 }  // namespace font_service