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
49FontMessageFilter::~FontMessageFilter() {}
50
51scoped_refptr<base::TaskRunner> FontMessageFilter::OverrideTaskRunnerForMessage(
52    const IPC::Message& msg) {
53  // Use the blocking pool to get the font list (currently the only message)
54  // Since getting the font list is non-threadsafe on Linux (for versions of
55  // Pango predating 2013), use a sequenced task runner.
56  base::SequencedWorkerPool* pool = BrowserThread::GetBlockingPool();
57  return pool->GetSequencedTaskRunner(
58      pool->GetNamedSequenceToken(kFontListSequenceToken));
59}
60
61int32_t FontMessageFilter::OnResourceMessageReceived(
62    const IPC::Message& msg,
63    ppapi::host::HostMessageContext* context) {
64  PPAPI_BEGIN_MESSAGE_MAP(FontMessageFilter, msg)
65    PPAPI_DISPATCH_HOST_RESOURCE_CALL_0(
66        PpapiHostMsg_TrueTypeFontSingleton_GetFontFamilies,
67        OnHostMsgGetFontFamilies)
68    PPAPI_DISPATCH_HOST_RESOURCE_CALL(
69        PpapiHostMsg_TrueTypeFontSingleton_GetFontsInFamily,
70        OnHostMsgGetFontsInFamily)
71  PPAPI_END_MESSAGE_MAP()
72  return PP_ERROR_FAILED;
73}
74
75int32_t FontMessageFilter::OnHostMsgGetFontFamilies(
76    ppapi::host::HostMessageContext* context) {
77  // OK to use "slow blocking" version since we're on the blocking pool.
78  std::vector<std::string> font_families;
79  GetFontFamilies_SlowBlocking(&font_families);
80  // Sort the names in case the host platform returns them out of order.
81  std::sort(font_families.begin(), font_families.end());
82
83  context->reply_msg =
84      PpapiPluginMsg_TrueTypeFontSingleton_GetFontFamiliesReply(font_families);
85  return base::checked_cast<int32_t>(font_families.size());
86}
87
88int32_t FontMessageFilter::OnHostMsgGetFontsInFamily(
89    ppapi::host::HostMessageContext* context,
90    const std::string& family) {
91  // OK to use "slow blocking" version since we're on the blocking pool.
92  std::vector<ppapi::proxy::SerializedTrueTypeFontDesc> fonts_in_family;
93  GetFontsInFamily_SlowBlocking(family, &fonts_in_family);
94
95  context->reply_msg =
96      PpapiPluginMsg_TrueTypeFontSingleton_GetFontsInFamilyReply(
97          fonts_in_family);
98  return base::checked_cast<int32_t>(fonts_in_family.size());
99}
100
101}  // namespace
102
103PepperTrueTypeFontListHost::PepperTrueTypeFontListHost(BrowserPpapiHost* host,
104                                                       PP_Instance instance,
105                                                       PP_Resource resource)
106    : ResourceHost(host->GetPpapiHost(), instance, resource) {
107  AddFilter(scoped_refptr<ppapi::host::ResourceMessageFilter>(
108      new FontMessageFilter()));
109}
110
111PepperTrueTypeFontListHost::~PepperTrueTypeFontListHost() {}
112
113}  // namespace content
114