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      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
     48