// 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 "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,
    const scoped_refptr<ContextProvider>& context_provider)
    : OutputSurface(context_provider),
      display_client_(NULL),
      surface_manager_(surface_manager),
      factory_(surface_manager, this),
      allocator_(allocator) {
  capabilities_.delegated_rendering = true;
  capabilities_.max_frames_pending = 1;
  capabilities_.can_force_reclaim_resources = true;
  // Frame always needs to be swapped because forced resource reclaiming
  // destroys the Display's copy.
  capabilities_.draw_and_swap_full_viewport_every_frame = true;
}

SurfaceDisplayOutputSurface::~SurfaceDisplayOutputSurface() {
  client_ = NULL;
  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 != 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);

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

  client_->DidSwapBuffers();
}

bool SurfaceDisplayOutputSurface::BindToClient(OutputSurfaceClient* client) {
  DCHECK(client);
  DCHECK(display_client_);
  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()) {
    scoped_ptr<CompositorFrame> empty_frame(new CompositorFrame());
    empty_frame->delegated_frame_data.reset(new DelegatedFrameData);
    factory_.SubmitFrame(surface_id_, empty_frame.Pass(),
                         SurfaceFactory::DrawCallback());
  }
}

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

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

}  // namespace cc