content/browser/renderer_host/pepper/pepper_truetype_font_list_host.cc

   1 // Copyright 2013 The Chromium Authors
   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 <stdint.h>
   8
   9 #include <algorithm>
  10
  11 #include "base/logging.h"
  12 #include "base/numerics/safe_conversions.h"
  13 #include "content/browser/renderer_host/pepper/pepper_truetype_font_list.h"
  14 #include "content/common/font_list.h"
  15 #include "content/public/browser/browser_ppapi_host.h"
  16 #include "ppapi/host/dispatch_host_message.h"
  17 #include "ppapi/host/host_message_context.h"
  18 #include "ppapi/host/resource_message_filter.h"
  19 #include "ppapi/proxy/ppapi_messages.h"
  20
  21 namespace content {
  22
  23 namespace {
  24
  25 // Handles the font list request on the blocking pool.
  26 class TrueTypeFontMessageFilter : public ppapi::host::ResourceMessageFilter {
  27  public:
  28   TrueTypeFontMessageFilter();
  29
  30   TrueTypeFontMessageFilter(const TrueTypeFontMessageFilter&) = delete;
  31   TrueTypeFontMessageFilter& operator=(const TrueTypeFontMessageFilter&) =
  32       delete;
  33
  34   // ppapi::host::ResourceMessageFilter implementation.
  35   scoped_refptr<base::SequencedTaskRunner> OverrideTaskRunnerForMessage(
  36       const IPC::Message& msg) override;
  37   int32_t OnResourceMessageReceived(
  38       const IPC::Message& msg,
  39       ppapi::host::HostMessageContext* context) override;
  40
  41  private:
  42   ~TrueTypeFontMessageFilter() override;
  43
  44   // Message handlers.
  45   int32_t OnHostMsgGetFontFamilies(ppapi::host::HostMessageContext* context);
  46   int32_t OnHostMsgGetFontsInFamily(ppapi::host::HostMessageContext* context,
  47                                     const std::string& family);
  48 };
  49
  50 TrueTypeFontMessageFilter::TrueTypeFontMessageFilter() {}
  51
  52 TrueTypeFontMessageFilter::~TrueTypeFontMessageFilter() {}
  53
  54 scoped_refptr<base::SequencedTaskRunner>
  55 TrueTypeFontMessageFilter::OverrideTaskRunnerForMessage(
  56     const IPC::Message& msg) {
  57   // Use the font list SequencedTaskRunner to get the font list (currently the
  58   // only message) since getting the font list is non-threadsafe on Linux (for
  59   // versions of Pango predating 2013).
  60   return GetFontListTaskRunner();
  61 }
  62
  63 int32_t TrueTypeFontMessageFilter::OnResourceMessageReceived(
  64     const IPC::Message& msg,
  65     ppapi::host::HostMessageContext* context) {
  66   PPAPI_BEGIN_MESSAGE_MAP(TrueTypeFontMessageFilter, 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   PPAPI_END_MESSAGE_MAP()
  74   LOG(ERROR) << "Resource message unresolved";
  75   return PP_ERROR_FAILED;
  76 }
  77
  78 int32_t TrueTypeFontMessageFilter::OnHostMsgGetFontFamilies(
  79     ppapi::host::HostMessageContext* context) {
  80   // OK to use "slow blocking" version since we're on the blocking pool.
  81   std::vector<std::string> font_families;
  82   GetFontFamilies_SlowBlocking(&font_families);
  83   // Sort the names in case the host platform returns them out of order.
  84   std::sort(font_families.begin(), font_families.end());
  85
  86   context->reply_msg =
  87       PpapiPluginMsg_TrueTypeFontSingleton_GetFontFamiliesReply(font_families);
  88   return base::checked_cast<int32_t>(font_families.size());
  89 }
  90
  91 int32_t TrueTypeFontMessageFilter::OnHostMsgGetFontsInFamily(
  92     ppapi::host::HostMessageContext* context,
  93     const std::string& family) {
  94   // OK to use "slow blocking" version since we're on the blocking pool.
  95   std::vector<ppapi::proxy::SerializedTrueTypeFontDesc> fonts_in_family;
  96   GetFontsInFamily_SlowBlocking(family, &fonts_in_family);
  97
  98   context->reply_msg =
  99       PpapiPluginMsg_TrueTypeFontSingleton_GetFontsInFamilyReply(
 100           fonts_in_family);
 101   return base::checked_cast<int32_t>(fonts_in_family.size());
 102 }
 103
 104 }  // namespace
 105
 106 PepperTrueTypeFontListHost::PepperTrueTypeFontListHost(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 TrueTypeFontMessageFilter()));
 112 }
 113
 114 PepperTrueTypeFontListHost::~PepperTrueTypeFontListHost() {}
 115
 116 }  // namespace content