Pepper API implementation for output protection.

chrome/browser/renderer_host/pepper/pepper_output_protection_host.cc

+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/browser/renderer_host/pepper/pepper_output_protection_host.h"
+
+#include "build/build_config.h"
+#include "content/public/browser/browser_ppapi_host.h"
+#include "content/public/browser/browser_thread.h"
+#include "ipc/ipc_message.h"
+#include "ppapi/c/pp_errors.h"
+#include "ppapi/c/private/ppb_output_protection_private.h"
+#include "ppapi/host/dispatch_host_message.h"
+#include "ppapi/host/host_message_context.h"
+#include "ppapi/host/ppapi_host.h"
+#include "ppapi/proxy/ppapi_messages.h"
+
+#if defined(USE_ASH) && defined(OS_CHROMEOS)
+#include "ash/shell.h"
+#include "ash/shell_delegate.h"
+#include "chromeos/display/output_configurator.h"
+#endif
+
+namespace chrome {
+
+PepperOutputProtectionHost::PepperOutputProtectionHost(
+    content::BrowserPpapiHost* host,
+    PP_Instance instance,
+    PP_Resource resource)
+    : ResourceHost(host->GetPpapiHost(), instance, resource),
+      renderer_ppapi_host_(host) {
+}
+
+PepperOutputProtectionHost::~PepperOutputProtectionHost() {
+#if defined(USE_ASH) && defined(OS_CHROMEOS)

[dmichael (off chromium), 2013/09/09 20:37:15]

Why not use gyp or ifdef out the whole file? (and also the .h contents)

[kcwu, 2013/09/10 12:50:21]

If conditional build the whole file, this means I have to use ifdef OS_CHROMEOS
in ppapi/proxy/output_protection_resource.cc to return failure there, right?

[dmichael (off chromium), 2013/09/11 18:22:45]

I guess I was thinking that it would be ideal if the interface wasn't even
visible to the plugin if it's on a platform where the API is unsupported. In
that world, you would ifdef out the whole ppapi/proxy "Resource" too.

But maybe that's too hard to pull off with the way we have resources defined.

[kcwu, 2013/09/12 18:22:08]

IIUC how pepper works, in order to make it true invisible, some generated code,
i.e. pnacl_shim.c, are involved.
I would prefer the simpler way.

+  chromeos::OutputConfigurator* configurator =
+      ash::Shell::GetInstance()->output_configurator();
+  content::BrowserThread::PostTask(
+      content::BrowserThread::UI,
+      FROM_HERE,
+      base::Bind(base::IgnoreResult(
+                     &chromeos::OutputConfigurator::EnableOutputProtection),
+                 base::Unretained(configurator),
+                 base::Unretained(this),

[dmichael (off chromium), 2013/09/09 20:37:15]

I don't know what EnableOutputProtection actually does, but it seems dangerous
to pass "this" from the destructor to PostTask...

[kcwu, 2013/09/10 12:50:21]

I just pass the pointer "value" as client id and never deference it.

+                 PP_OUTPUT_PROTECTION_METHOD_PRIVATE_NONE));
+#endif
+}
+
+int32_t PepperOutputProtectionHost::OnResourceMessageReceived(
+    const IPC::Message& msg,
+    ppapi::host::HostMessageContext* context) {
+  IPC_BEGIN_MESSAGE_MAP(PepperOutputProtectionHost, msg)
+    PPAPI_DISPATCH_HOST_RESOURCE_CALL_0(
+        PpapiHostMsg_OutputProtection_QueryStatus,
+        OnQueryStatus);
+    PPAPI_DISPATCH_HOST_RESOURCE_CALL(
+        PpapiHostMsg_OutputProtection_EnableProtection,
+        OnEnableProtection);
+  IPC_END_MESSAGE_MAP()
+  return PP_ERROR_FAILED;
+}
+
+void PepperOutputProtectionHost::QueryStatusOnUIThread(
+    ppapi::host::ReplyMessageContext reply_context) {
+  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+
+#if defined(USE_ASH) && defined(OS_CHROMEOS)
+  chromeos::OutputConfigurator* configurator =
+      ash::Shell::GetInstance()->output_configurator();

[dmichael (off chromium), 2013/09/09 20:37:15]

can this ever be NULL?

[kcwu, 2013/09/10 12:50:21]

output_configurator will not be NULL if shell instance is alive.
Regarding to shell instance, I'm not sure, all caller don't check NULL as I
know.

+  uint32_t link_mask = 0, protection_mask = 0;
+  bool result = configurator->QueryOutputProtectionStatus(
+      this, &link_mask, &protection_mask);
+#else
+  bool result = false;
+#endif
+
+  reply_context.params.set_result(result ? PP_OK : PP_ERROR_FAILED);
+  host()->SendReply(reply_context,
+      PpapiPluginMsg_OutputProtection_QueryStatusReply(
+          link_mask, protection_mask));
+}
+
+int32_t PepperOutputProtectionHost::OnQueryStatus(
+    ppapi::host::HostMessageContext* context) {
+

[dmichael (off chromium), 2013/09/09 20:37:15]

nit: excess whitespace

[kcwu, 2013/09/10 12:50:21]

Done.

+  content::BrowserThread::PostTask(
+      content::BrowserThread::UI,
+      FROM_HERE,
+      base::Bind(&PepperOutputProtectionHost::QueryStatusOnUIThread,
+                 base::Unretained(this),
+                 context->MakeReplyMessageContext()));
+

[dmichael (off chromium), 2013/09/09 20:37:15]

nit: excess whitespace

[kcwu, 2013/09/10 12:50:21]

Done.

+  return PP_OK_COMPLETIONPENDING;
+}
+
+void PepperOutputProtectionHost::EnableProtectionOnUIThread(
+    ppapi::host::ReplyMessageContext reply_context,
+    uint32_t desired_method_mask) {
+  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+
+#if defined(USE_ASH) && defined(OS_CHROMEOS)
+  chromeos::OutputConfigurator* configurator =
+      ash::Shell::GetInstance()->output_configurator();
+  bool result = configurator->EnableOutputProtection(
+      this, desired_method_mask);
+#else
+  bool result = false;
+#endif
+
+  reply_context.params.set_result(result ? PP_OK : PP_ERROR_FAILED);
+  host()->SendReply(reply_context,
+      PpapiPluginMsg_OutputProtection_EnableProtectionReply());
+}
+
+int32_t
+PepperOutputProtectionHost::OnEnableProtection(

[dmichael (off chromium), 2013/09/09 20:37:15]

nit: it looks like this line should fit with the return type

[kcwu, 2013/09/10 12:50:21]

Done.

+    ppapi::host::HostMessageContext* context,
+    uint32_t desired_method_mask) {
+

[dmichael (off chromium), 2013/09/09 20:37:15]

nit: excess whitespace in this function body too.

[kcwu, 2013/09/10 12:50:21]

Done.

+  content::BrowserThread::PostTask(
+      content::BrowserThread::UI,
+      FROM_HERE,
+      base::Bind(&PepperOutputProtectionHost::EnableProtectionOnUIThread,
+                 base::Unretained(this),
+                 context->MakeReplyMessageContext(),
+                 desired_method_mask));
+
+  return PP_OK_COMPLETIONPENDING;
+}
+
+}  // namespace content
+