content/renderer/stream_texture_host_android.cc

// Copyright (c) 2012 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 "content/renderer/stream_texture_host_android.h"

#include "base/unguessable_token.h"
#include "content/renderer/render_thread_impl.h"
#include "gpu/ipc/client/gpu_channel_host.h"
#include "gpu/ipc/common/command_buffer_id.h"
#include "gpu/ipc/common/gpu_messages.h"
#include "ipc/ipc_message_macros.h"

namespace content {

StreamTextureHost::StreamTextureHost(scoped_refptr<gpu::GpuChannelHost> channel,
                                     int32_t route_id)
    : route_id_(route_id), listener_(nullptr), channel_(std::move(channel)) {
  DCHECK(channel_);
  DCHECK(route_id_);
}

StreamTextureHost::~StreamTextureHost() {
  if (channel_) {
    // We destroy the StreamTexture as a deferred message followed by a flush
    // to ensure this is ordered correctly with regards to previous deferred
    // messages, such as CreateSharedImage.
    uint32_t flush_id = channel_->EnqueueDeferredMessage(
        GpuStreamTextureMsg_Destroy(route_id_));
    channel_->EnsureFlush(flush_id);
    channel_->RemoveRoute(route_id_);
  }
}

bool StreamTextureHost::BindToCurrentThread(Listener* listener) {
  listener_ = listener;

  if (channel_) {
    channel_->AddRoute(route_id_, weak_ptr_factory_.GetWeakPtr());
    channel_->Send(new GpuStreamTextureMsg_StartListening(route_id_));
    return true;
  }

  return false;
}

bool StreamTextureHost::OnMessageReceived(const IPC::Message& message) {
  bool handled = true;
  IPC_BEGIN_MESSAGE_MAP(StreamTextureHost, message)
    IPC_MESSAGE_HANDLER(GpuStreamTextureMsg_FrameAvailable, OnFrameAvailable);
    IPC_MESSAGE_UNHANDLED(handled = false)
  IPC_END_MESSAGE_MAP()
  DCHECK(handled);
  return handled;
}

void StreamTextureHost::OnChannelError() {
  channel_ = nullptr;
}

void StreamTextureHost::OnFrameAvailable() {
  if (listener_)
    listener_->OnFrameAvailable();
}

void StreamTextureHost::ForwardStreamTextureForSurfaceRequest(
    const base::UnguessableToken& request_token) {
  if (channel_) {
    channel_->Send(new GpuStreamTextureMsg_ForwardForSurfaceRequest(
        route_id_, request_token));
  }
}

gpu::Mailbox StreamTextureHost::CreateSharedImage(const gfx::Size& size) {
  if (!channel_)
    return gpu::Mailbox();

  auto mailbox = gpu::Mailbox::GenerateForSharedImage();
  channel_->EnqueueDeferredMessage(GpuStreamTextureMsg_CreateSharedImage(
      route_id_, mailbox, size, ++release_id_));
  return mailbox;
}

gpu::SyncToken StreamTextureHost::GenUnverifiedSyncToken() {
  // |channel_| can be set to null via OnChannelError() which means
  // StreamTextureHost could still be alive when |channel_| is gone.
  if (!channel_)
    return gpu::SyncToken();

  return gpu::SyncToken(gpu::CommandBufferNamespace::GPU_IO,
                        gpu::CommandBufferIdFromChannelAndRoute(
                            channel_->channel_id(), route_id_),
                        release_id_);
}

}  // namespace content