src/content/browser/renderer_host/pepper/pepper_truetype_font_list_host.cc

   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
  20 namespace content {
  21
  22 namespace {
  23
  24 // Handles the font list request on the blocking pool.
  25 class FontMessageFilter : public ppapi::host::ResourceMessageFilter {
  26  public:
  27   FontMessageFilter();
  28
  29   // ppapi::host::ResourceMessageFilter implementation.
  30   scoped_refptr<base::TaskRunner> OverrideTaskRunnerForMessage(
  31       const IPC::Message& msg) override;
  32   int32_t OnResourceMessageReceived(
  33       const IPC::Message& msg,
  34       ppapi::host::HostMessageContext* context) override;
  35
  36  private:
  37   ~FontMessageFilter() override;
  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
  47 FontMessageFilter::FontMessageFilter() {}
  48
  49 FontMessageFilter::~FontMessageFilter() {}
  50
  51 scoped_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
  61 int32_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
  75 int32_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
  88 int32_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
 103 PepperTrueTypeFontListHost::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
 111 PepperTrueTypeFontListHost::~PepperTrueTypeFontListHost() {}
 112
 113 }  // namespace content