content/browser/font_list_async.cc

   1 // Copyright (c) 2011 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 "content/public/browser/font_list_async.h"
   6
   7 #include "base/bind.h"
   8 #include "base/values.h"
   9 #include "content/common/font_list.h"
  10 #include "content/public/browser/browser_thread.h"
  11
  12 namespace content {
  13
  14 namespace {
  15
  16 // Just executes the given callback with the parameter.
  17 void ReturnFontListToOriginalThread(
  18     const base::Callback<void(scoped_ptr<base::ListValue>)>& callback,
  19     scoped_ptr<base::ListValue> result) {
  20   callback.Run(result.Pass());
  21 }
  22
  23 void GetFontListInBlockingPool(
  24     BrowserThread::ID calling_thread_id,
  25     const base::Callback<void(scoped_ptr<base::ListValue>)>& callback) {
  26   scoped_ptr<base::ListValue> result(GetFontList_SlowBlocking());
  27   BrowserThread::PostTask(calling_thread_id, FROM_HERE,
  28       base::Bind(&ReturnFontListToOriginalThread, callback,
  29                  base::Passed(&result)));
  30 }
  31
  32 }  // namespace
  33
  34 void GetFontListAsync(
  35     const base::Callback<void(scoped_ptr<base::ListValue>)>& callback) {
  36   BrowserThread::ID id;
  37   bool well_known_thread = BrowserThread::GetCurrentThreadIdentifier(&id);
  38   DCHECK(well_known_thread)
  39       << "Can only call GetFontList from a well-known thread.";
  40
  41   BrowserThread::PostBlockingPoolSequencedTask(
  42       kFontListSequenceToken,
  43       FROM_HERE,
  44       base::Bind(&GetFontListInBlockingPool, id, callback));
  45 }
  46
  47 }  // namespace content