// 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 "cc/layers/delegated_frame_provider.h"

#include "cc/layers/delegated_frame_resource_collection.h"
#include "cc/layers/delegated_renderer_layer.h"
#include "cc/output/delegated_frame_data.h"
#include "cc/quads/render_pass_draw_quad.h"

namespace cc {

DelegatedFrameProvider::DelegatedFrameProvider(
    const scoped_refptr<DelegatedFrameResourceCollection>& resource_collection,
    scoped_ptr<DelegatedFrameData> frame)
    : resource_collection_(resource_collection) {
  RenderPass* root_pass = frame->render_pass_list.back();
  frame_size_ = root_pass->output_rect.size();
  DCHECK(!frame_size_.IsEmpty());
  SetFrameData(frame.Pass());
}

DelegatedFrameProvider::~DelegatedFrameProvider() {
  ReturnedResourceArray returned;
  TransferableResource::ReturnResources(frame_->resource_list, &returned);
  resource_collection_->UnrefResources(returned);
}

void DelegatedFrameProvider::AddObserver(DelegatedRendererLayer* layer) {
#if DCHECK_IS_ON()
  for (size_t i = 0; i < observers_.size(); ++i)
    DCHECK(observers_[i].layer != layer);
#endif

  observers_.push_back(Observer(layer, gfx::RectF(frame_size_)));

  DCHECK(frame_) << "Must have a frame when given to a DelegatedRendererLayer.";
}

void DelegatedFrameProvider::RemoveObserver(DelegatedRendererLayer* layer) {
  bool found_observer = false;
  for (size_t i = 0; i < observers_.size(); ++i) {
    if (observers_[i].layer != layer)
      continue;
    observers_.erase(observers_.begin() + i);
    found_observer = true;
    break;
  }
  DCHECK(found_observer);
}

void DelegatedFrameProvider::SetFrameData(
    scoped_ptr<DelegatedFrameData> frame) {
  DCHECK(frame);
  DCHECK_NE(0u, frame->render_pass_list.size());

  if (frame_) {
    ReturnedResourceArray returned;
    TransferableResource::ReturnResources(frame_->resource_list, &returned);
    resource_collection_->UnrefResources(returned);
  }

  frame_ = frame.Pass();

  resource_collection_->ReceivedResources(frame_->resource_list);
  resource_collection_->RefResources(frame_->resource_list);

  RenderPass* root_pass = frame_->render_pass_list.back();
  DCHECK_EQ(frame_size_.ToString(), root_pass->output_rect.size().ToString())
      << "All frames in a single DelegatedFrameProvider must have the same "
      << "size. Use a new frame provider for frames of a different size.";

  for (size_t i = 0; i < observers_.size(); ++i) {
    observers_[i].damage =
        gfx::UnionRects(observers_[i].damage, root_pass->damage_rect);
    observers_[i].layer->ProviderHasNewFrame();
  }
}

DelegatedFrameData* DelegatedFrameProvider::GetFrameDataAndRefResources(
    DelegatedRendererLayer* observer,
    gfx::RectF* damage) {

  bool found_observer = false;
  for (size_t i = 0; i < observers_.size(); ++i) {
    if (observers_[i].layer != observer)
      continue;
    *damage = observers_[i].damage;
    // The observer is now responsible for the damage.
    observers_[i].damage = gfx::RectF();
    found_observer = true;
  }
  DCHECK(found_observer);

  resource_collection_->RefResources(frame_->resource_list);
  return frame_.get();
}

ReturnCallback
DelegatedFrameProvider::GetReturnResourcesCallbackForImplThread() {
  return resource_collection_->GetReturnResourcesCallbackForImplThread();
}

void DelegatedFrameProvider::UnrefResourcesOnMainThread(
    const ReturnedResourceArray& returned) {
  resource_collection_->UnrefResources(returned);
}

}  // namespace cc