pepper_truetype_font_list_host.cc revision 5d1f7b1de12d16ceb2c938c56701a3e8bfa558f7 
1// Copyright (c) 2013 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/browser/renderer_host/pepper/pepper_truetype_font_list_host.h"
6
7#include <algorithm>
8
9#include "base/numerics/safe_conversions.h"
10#include "base/threading/sequenced_worker_pool.h"
11#include "content/browser/renderer_host/pepper/pepper_truetype_font_list.h"
12#include "content/common/font_list.h"
13#include "content/public/browser/browser_ppapi_host.h"
14#include "content/public/browser/browser_thread.h"
15#include "ppapi/host/dispatch_host_message.h"
16#include "ppapi/host/host_message_context.h"
17#include "ppapi/host/resource_message_filter.h"
18#include "ppapi/proxy/ppapi_messages.h"
19
20namespace content {
21
22namespace {
23
24// Handles the font list request on the blocking pool.
25class FontMessageFilter : public ppapi::host::ResourceMessageFilter {
26 public:
27  FontMessageFilter();
28
29  // ppapi::host::ResourceMessageFilter implementation.
30  virtual scoped_refptr<base::TaskRunner> OverrideTaskRunnerForMessage(
31      const IPC::Message& msg) OVERRIDE;
32  virtual int32_t OnResourceMessageReceived(
33      const IPC::Message& msg,
34      ppapi::host::HostMessageContext* context) OVERRIDE;
35
36 private:
37  virtual ~FontMessageFilter();
38
39  // Message handlers.
40  int32_t OnHostMsgGetFontFamilies(ppapi::host::HostMessageContext* context);
41  int32_t OnHostMsgGetFontsInFamily(ppapi::host::HostMessageContext* context,
42                                    const std::string& family);
43
44  DISALLOW_COPY_AND_ASSIGN(FontMessageFilter);
45};
46
47FontMessageFilter::FontMessageFilter() {
48}
49
50FontMessageFilter::~FontMessageFilter() {
51}
52
53scoped_refptr<base::TaskRunner> FontMessageFilter::OverrideTaskRunnerForMessage(
54    const IPC::Message& msg) {
55  // Use the blocking pool to get the font list (currently the only message)
56  // Since getting the font list is non-threadsafe on Linux (for versions of
57  // Pango predating 2013), use a sequenced task runner.
58  base::SequencedWorkerPool* pool = BrowserThread::GetBlockingPool();
59  return pool->GetSequencedTaskRunner(
60      pool->GetNamedSequenceToken(kFontListSequenceToken));
61}
62
63int32_t FontMessageFilter::OnResourceMessageReceived(
64    const IPC::Message& msg,
65    ppapi::host::HostMessageContext* context) {
66  IPC_BEGIN_MESSAGE_MAP(FontMessageFilter, msg)
67    PPAPI_DISPATCH_HOST_RESOURCE_CALL_0(
68        PpapiHostMsg_TrueTypeFontSingleton_GetFontFamilies,
69        OnHostMsgGetFontFamilies)
70    PPAPI_DISPATCH_HOST_RESOURCE_CALL(
71        PpapiHostMsg_TrueTypeFontSingleton_GetFontsInFamily,
72        OnHostMsgGetFontsInFamily)
73  IPC_END_MESSAGE_MAP()
74  return PP_ERROR_FAILED;
75}
76
77int32_t FontMessageFilter::OnHostMsgGetFontFamilies(
78    ppapi::host::HostMessageContext* context) {
79  // OK to use "slow blocking" version since we're on the blocking pool.
80  std::vector<std::string> font_families;
81  GetFontFamilies_SlowBlocking(&font_families);
82  // Sort the names in case the host platform returns them out of order.
83  std::sort(font_families.begin(), font_families.end());
84
85  context->reply_msg =
86      PpapiPluginMsg_TrueTypeFontSingleton_GetFontFamiliesReply(font_families);
87  return base::checked_cast<int32_t>(font_families.size());
88}
89
90int32_t FontMessageFilter::OnHostMsgGetFontsInFamily(
91    ppapi::host::HostMessageContext* context,
92    const std::string& family) {
93  // OK to use "slow blocking" version since we're on the blocking pool.
94  std::vector<ppapi::proxy::SerializedTrueTypeFontDesc> fonts_in_family;
95  GetFontsInFamily_SlowBlocking(family, &fonts_in_family);
96
97  context->reply_msg =
98      PpapiPluginMsg_TrueTypeFontSingleton_GetFontsInFamilyReply(
99          fonts_in_family);
100  return base::checked_cast<int32_t>(fonts_in_family.size());
101}
102
103}  // namespace
104
105PepperTrueTypeFontListHost::PepperTrueTypeFontListHost(
106    BrowserPpapiHost* host,
107    PP_Instance instance,
108    PP_Resource resource)
109    : ResourceHost(host->GetPpapiHost(), instance, resource) {
110  AddFilter(scoped_refptr<ppapi::host::ResourceMessageFilter>(
111      new FontMessageFilter()));
112}
113
114PepperTrueTypeFontListHost::~PepperTrueTypeFontListHost() {
115}
116
117}  // namespace content
118