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
PepperGamepadHost(BrowserPpapiHost * host,PP_Instance instance,PP_Resource resource)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
PepperGamepadHost(GamepadService * gamepad_service,BrowserPpapiHost * host,PP_Instance instance,PP_Resource resource)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
~PepperGamepadHost()38 PepperGamepadHost::~PepperGamepadHost() {
39 if (is_started_)
40 gamepad_service_->RemoveConsumer(this);
41 }
42
OnResourceMessageReceived(const IPC::Message & msg,ppapi::host::HostMessageContext * context)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
OnRequestMemory(ppapi::host::HostMessageContext * context)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
GotUserGesture(const ppapi::host::ReplyMessageContext & context)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