content/renderer/gpu/compositor_external_begin_frame_source.cc


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// Copyright 2014 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/gpu/compositor_external_begin_frame_source.h"

#include "content/common/view_messages.h"
#include "ipc/ipc_sync_channel.h"
#include "ipc/ipc_sync_message_filter.h"

namespace content {

CompositorExternalBeginFrameSource::CompositorExternalBeginFrameSource(
    CompositorForwardingMessageFilter* filter,
    IPC::SyncMessageFilter* sync_message_filter,
    int routing_id)
    : begin_frame_source_filter_(filter),
      message_sender_(sync_message_filter),
      routing_id_(routing_id) {
  DCHECK(begin_frame_source_filter_.get());
  DCHECK(message_sender_.get());
  DetachFromThread();
}

CompositorExternalBeginFrameSource::~CompositorExternalBeginFrameSource() {
  DCHECK(CalledOnValidThread());
  if (begin_frame_source_proxy_.get()) {
    begin_frame_source_proxy_->ClearBeginFrameSource();
    begin_frame_source_filter_->RemoveHandlerOnCompositorThread(
                                    routing_id_,
                                    begin_frame_source_filter_handler_);
  }
}

void CompositorExternalBeginFrameSource::OnNeedsBeginFramesChanged(
    bool needs_begin_frames) {
  DCHECK(CalledOnValidThread());
  if (!needs_begin_frames)
    missed_begin_frame_args_ = cc::BeginFrameArgs();
  Send(new ViewHostMsg_SetNeedsBeginFrames(routing_id_, needs_begin_frames));
}

void CompositorExternalBeginFrameSource::AddObserver(
    cc::BeginFrameObserver* obs) {
  DCHECK(CalledOnValidThread());
  SetClientReady();
  BeginFrameSourceBase::AddObserver(obs);
  // Send a MISSED begin frame if necessary.
  if (missed_begin_frame_args_.IsValid()) {
    cc::BeginFrameArgs last_args = obs->LastUsedBeginFrameArgs();
    if (!last_args.IsValid() ||
        (missed_begin_frame_args_.frame_time > last_args.frame_time)) {
      obs->OnBeginFrame(missed_begin_frame_args_);
    }
  }
}

void CompositorExternalBeginFrameSource::SetClientReady() {
  DCHECK(CalledOnValidThread());
  if (begin_frame_source_proxy_)
    return;
  begin_frame_source_proxy_ =
      new CompositorExternalBeginFrameSourceProxy(this);
  begin_frame_source_filter_handler_ = base::Bind(
      &CompositorExternalBeginFrameSourceProxy::OnMessageReceived,
      begin_frame_source_proxy_);
  begin_frame_source_filter_->AddHandlerOnCompositorThread(
      routing_id_,
      begin_frame_source_filter_handler_);
}

void CompositorExternalBeginFrameSource::OnMessageReceived(
    const IPC::Message& message) {
  DCHECK(CalledOnValidThread());
  DCHECK(begin_frame_source_proxy_.get());
  IPC_BEGIN_MESSAGE_MAP(CompositorExternalBeginFrameSource, message)
    IPC_MESSAGE_HANDLER(ViewMsg_BeginFrame, OnBeginFrame)
  IPC_END_MESSAGE_MAP()
}

void CompositorExternalBeginFrameSource::OnBeginFrame(
  const cc::BeginFrameArgs& args) {
  DCHECK(CalledOnValidThread());
  missed_begin_frame_args_ = args;
  missed_begin_frame_args_.type = cc::BeginFrameArgs::MISSED;
  CallOnBeginFrame(args);
}

bool CompositorExternalBeginFrameSource::Send(IPC::Message* message) {
  return message_sender_->Send(message);
}

}  // namespace content