// 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 "cc/surfaces/surface_display_output_surface.h"

#include "base/bind.h"
#include "cc/output/compositor_frame.h"
#include "cc/output/compositor_frame_ack.h"
#include "cc/surfaces/display.h"
#include "cc/surfaces/onscreen_display_client.h"
#include "cc/surfaces/surface.h"
#include "cc/surfaces/surface_manager.h"

namespace cc {

SurfaceDisplayOutputSurface::SurfaceDisplayOutputSurface(
    SurfaceManager* surface_manager,
    SurfaceIdAllocator* allocator,
    scoped_refptr<ContextProvider> context_provider,
    scoped_refptr<ContextProvider> worker_context_provider)
    : OutputSurface(std::move(context_provider),
                    std::move(worker_context_provider)),
      display_client_(NULL),
      factory_(surface_manager, this),
      allocator_(allocator) {
  factory_.set_needs_sync_points(false);
  capabilities_.delegated_rendering = true;
  capabilities_.adjust_deadline_for_parent = true;
  capabilities_.can_force_reclaim_resources = true;
  // Display and SurfaceDisplayOutputSurface share a GL context, so sync
  // points aren't needed when passing resources between them.
  capabilities_.delegated_sync_points_required = false;
}

SurfaceDisplayOutputSurface::~SurfaceDisplayOutputSurface() {
  if (HasClient())
    DetachFromClient();
  if (!surface_id_.is_null()) {
    factory_.Destroy(surface_id_);
  }
}

void SurfaceDisplayOutputSurface::ReceivedVSyncParameters(
    base::TimeTicks timebase,
    base::TimeDelta interval) {
  CommitVSyncParameters(timebase, interval);
}

void SurfaceDisplayOutputSurface::SwapBuffers(CompositorFrame* frame) {
  gfx::Size frame_size =
      frame->delegated_frame_data->render_pass_list.back()->output_rect.size();
  if (frame_size.IsEmpty() || frame_size != display_size_) {
    if (!surface_id_.is_null()) {
      factory_.Destroy(surface_id_);
    }
    surface_id_ = allocator_->GenerateId();
    factory_.Create(surface_id_);
    display_size_ = frame_size;
  }
  display_client_->display()->SetSurfaceId(surface_id_,
                                           frame->metadata.device_scale_factor);

  client_->DidSwapBuffers();

  scoped_ptr<CompositorFrame> frame_copy(new CompositorFrame());
  frame->AssignTo(frame_copy.get());
  factory_.SubmitCompositorFrame(
      surface_id_, std::move(frame_copy),
      base::Bind(&SurfaceDisplayOutputSurface::SwapBuffersComplete,
                 base::Unretained(this)));
}

bool SurfaceDisplayOutputSurface::BindToClient(OutputSurfaceClient* client) {
  DCHECK(client);
  DCHECK(display_client_);
  factory_.manager()->RegisterSurfaceFactoryClient(allocator_->id_namespace(),
                                                   this);

  client_ = client;
  // Avoid initializing GL context here, as this should be sharing the
  // Display's context.
  return display_client_->Initialize();
}

void SurfaceDisplayOutputSurface::ForceReclaimResources() {
  if (!surface_id_.is_null())
    factory_.SubmitCompositorFrame(surface_id_, nullptr,
                                   SurfaceFactory::DrawCallback());
}

void SurfaceDisplayOutputSurface::DetachFromClient() {
  DCHECK(HasClient());
  // Unregister the SurfaceFactoryClient here instead of the dtor so that only
  // one client is alive for this namespace at any given time.
  factory_.manager()->UnregisterSurfaceFactoryClient(
      allocator_->id_namespace());
  OutputSurface::DetachFromClient();
  DCHECK(!HasClient());
}

void SurfaceDisplayOutputSurface::ReturnResources(
    const ReturnedResourceArray& resources) {
  CompositorFrameAck ack;
  ack.resources = resources;
  if (client_)
    client_->ReclaimResources(&ack);
}

void SurfaceDisplayOutputSurface::SetBeginFrameSource(
    BeginFrameSource* begin_frame_source) {
  // TODO(tansell): Hook this up.
}

void SurfaceDisplayOutputSurface::SwapBuffersComplete(SurfaceDrawStatus drawn) {
  if (client_ && !display_client_->output_surface_lost())
    client_->DidSwapBuffersComplete();
}

}  // namespace cc