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 PepperGamepadHost::PepperGamepadHost(GamepadService* gamepad_service,
     29                                      BrowserPpapiHost* host,
     30                                      PP_Instance instance,
     31                                      PP_Resource resource)
     32     : ResourceHost(host->GetPpapiHost(), instance, resource),
     33       browser_ppapi_host_(host),
     34       gamepad_service_(gamepad_service),
     35       is_started_(false),
     36       weak_factory_(this) {}
     37 
     38 PepperGamepadHost::~PepperGamepadHost() {
     39   if (is_started_)
     40     gamepad_service_->RemoveConsumer(this);
     41 }
     42 
     43 int32_t PepperGamepadHost::OnResourceMessageReceived(
     44     const IPC::Message& msg,
     45     ppapi::host::HostMessageContext* context) {
     46   PPAPI_BEGIN_MESSAGE_MAP(PepperGamepadHost, msg)
     47     PPAPI_DISPATCH_HOST_RESOURCE_CALL_0(PpapiHostMsg_Gamepad_RequestMemory,
     48                                         OnRequestMemory)
     49   PPAPI_END_MESSAGE_MAP()
     50   return PP_ERROR_FAILED;
     51 }
     52 
     53 int32_t PepperGamepadHost::OnRequestMemory(
     54     ppapi::host::HostMessageContext* context) {
     55   if (is_started_)
     56     return PP_ERROR_FAILED;
     57 
     58   gamepad_service_->ConsumerBecameActive(this);
     59   is_started_ = true;
     60 
     61   // Don't send the shared memory back until the user has interacted with the
     62   // gamepad. This is to prevent fingerprinting and matches what the web
     63   // platform does.
     64   gamepad_service_->RegisterForUserGesture(
     65       base::Bind(&PepperGamepadHost::GotUserGesture,
     66                  weak_factory_.GetWeakPtr(),
     67                  context->MakeReplyMessageContext()));
     68   return PP_OK_COMPLETIONPENDING;
     69 }
     70 
     71 void PepperGamepadHost::GotUserGesture(
     72     const ppapi::host::ReplyMessageContext& context) {
     73   base::SharedMemoryHandle handle =
     74       gamepad_service_->GetSharedMemoryHandleForProcess(
     75           browser_ppapi_host_->GetPluginProcessHandle());
     76 
     77   context.params.AppendHandle(ppapi::proxy::SerializedHandle(
     78       handle, sizeof(ppapi::ContentGamepadHardwareBuffer)));
     79   host()->SendReply(context, PpapiPluginMsg_Gamepad_SendMemory());
     80 }
     81 
     82 }  // namespace content
     83