Home | History | Annotate | Download | only in pepper 
      1 // Copyright (c) 2012 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_gamepad_host.h"
      6 
      7 #include "base/bind.h"
      8 #include "content/browser/gamepad/gamepad_service.h"
      9 #include "content/public/browser/browser_ppapi_host.h"
     10 #include "ppapi/c/pp_errors.h"
     11 #include "ppapi/host/dispatch_host_message.h"
     12 #include "ppapi/host/host_message_context.h"
     13 #include "ppapi/host/ppapi_host.h"
     14 #include "ppapi/proxy/ppapi_messages.h"
     15 #include "ppapi/shared_impl/ppb_gamepad_shared.h"
     16 
     17 namespace content {
     18 
     19 PepperGamepadHost::PepperGamepadHost(BrowserPpapiHost* host,
     20                                      PP_Instance instance,
     21                                      PP_Resource resource)
     22     : ResourceHost(host->GetPpapiHost(), instance, resource),
     23       browser_ppapi_host_(host),
     24       gamepad_service_(GamepadService::GetInstance()),
     25       is_started_(false),
     26       weak_factory_(this) {
     27 }
     28 
     29 PepperGamepadHost::PepperGamepadHost(GamepadService* gamepad_service,
     30                                      BrowserPpapiHost* host,
     31                                      PP_Instance instance,
     32                                      PP_Resource resource)
     33     : ResourceHost(host->GetPpapiHost(), instance, resource),
     34       browser_ppapi_host_(host),
     35       gamepad_service_(gamepad_service),
     36       is_started_(false),
     37       weak_factory_(this) {
     38 }
     39 
     40 PepperGamepadHost::~PepperGamepadHost() {
     41   if (is_started_)
     42     gamepad_service_->RemoveConsumer();
     43 }
     44 
     45 int32_t PepperGamepadHost::OnResourceMessageReceived(
     46     const IPC::Message& msg,
     47     ppapi::host::HostMessageContext* context) {
     48   IPC_BEGIN_MESSAGE_MAP(PepperGamepadHost, msg)
     49     PPAPI_DISPATCH_HOST_RESOURCE_CALL_0(PpapiHostMsg_Gamepad_RequestMemory,
     50                                         OnRequestMemory)
     51   IPC_END_MESSAGE_MAP()
     52   return PP_ERROR_FAILED;
     53 }
     54 
     55 int32_t PepperGamepadHost::OnRequestMemory(
     56     ppapi::host::HostMessageContext* context) {
     57   if (is_started_)
     58     return PP_ERROR_FAILED;
     59 
     60   gamepad_service_->AddConsumer();
     61   is_started_ = true;
     62 
     63   // Don't send the shared memory back until the user has interacted with the
     64   // gamepad. This is to prevent fingerprinting and matches what the web
     65   // platform does.
     66   gamepad_service_->RegisterForUserGesture(
     67       base::Bind(&PepperGamepadHost::GotUserGesture,
     68                  weak_factory_.GetWeakPtr(),
     69                  context->MakeReplyMessageContext()));
     70   return PP_OK_COMPLETIONPENDING;
     71 }
     72 
     73 void PepperGamepadHost::GotUserGesture(
     74     const ppapi::host::ReplyMessageContext& context) {
     75   base::SharedMemoryHandle handle =
     76       gamepad_service_->GetSharedMemoryHandleForProcess(
     77           browser_ppapi_host_->GetPluginProcessHandle());
     78 
     79   context.params.AppendHandle(ppapi::proxy::SerializedHandle(
     80       handle, sizeof(ppapi::ContentGamepadHardwareBuffer)));
     81   host()->SendReply(context, PpapiPluginMsg_Gamepad_SendMemory());
     82 }
     83 
     84 }  // namespace content
     85