cc/layers/delegated_renderer_layer.cc

// Copyright 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 "cc/layers/delegated_renderer_layer.h"

#include "cc/layers/delegated_renderer_layer_client.h"
#include "cc/layers/delegated_renderer_layer_impl.h"
#include "cc/output/delegated_frame_data.h"

namespace cc {

scoped_refptr<DelegatedRendererLayer> DelegatedRendererLayer::Create(
    DelegatedRendererLayerClient* client) {
  return scoped_refptr<DelegatedRendererLayer>(
      new DelegatedRendererLayer(client));
}

DelegatedRendererLayer::DelegatedRendererLayer(
    DelegatedRendererLayerClient* client)
    : Layer(),
    client_(client) {}

DelegatedRendererLayer::~DelegatedRendererLayer() {}

scoped_ptr<LayerImpl> DelegatedRendererLayer::CreateLayerImpl(
    LayerTreeImpl* tree_impl) {
  return DelegatedRendererLayerImpl::Create(
      tree_impl, layer_id_).PassAs<LayerImpl>();
}

bool DelegatedRendererLayer::DrawsContent() const {
  return Layer::DrawsContent() && !frame_size_.IsEmpty();
}

void DelegatedRendererLayer::PushPropertiesTo(LayerImpl* impl) {
  Layer::PushPropertiesTo(impl);

  DelegatedRendererLayerImpl* delegated_impl =
      static_cast<DelegatedRendererLayerImpl*>(impl);

  delegated_impl->SetDisplaySize(display_size_);

  if (frame_data_)
    delegated_impl->SetFrameData(frame_data_.Pass(), damage_in_frame_);
  frame_data_.reset();
  damage_in_frame_ = gfx::RectF();

  delegated_impl->CollectUnusedResources(
      &unused_resources_for_child_compositor_);

  if (client_)
    client_->DidCommitFrameData();

  // TODO(danakj): TakeUnusedResourcesForChildCompositor requires a push
  // properties to happen in order to collect unused resources returned
  // from the parent compositor. crbug.com/259090
  needs_push_properties_ = true;
}

void DelegatedRendererLayer::SetDisplaySize(gfx::Size size) {
  if (display_size_ == size)
    return;
  display_size_ = size;
  SetNeedsCommit();
}

void DelegatedRendererLayer::SetFrameData(
    scoped_ptr<DelegatedFrameData> new_frame_data) {
  if (frame_data_) {
    // Copy the resources from the last provided frame into the new frame, as
    // it may use resources that were transferred in the last frame.
    new_frame_data->resource_list.insert(new_frame_data->resource_list.end(),
                                         frame_data_->resource_list.begin(),
                                         frame_data_->resource_list.end());
  }
  frame_data_ = new_frame_data.Pass();
  if (!frame_data_->render_pass_list.empty()) {
    RenderPass* root_pass = frame_data_->render_pass_list.back();
    damage_in_frame_.Union(root_pass->damage_rect);
    frame_size_ = root_pass->output_rect.size();

    // TODO(danakj): This could be optimized to only add resources to the
    // frame_data_ if they are actually used in the frame. For now, it will
    // cause the parent (this layer) to hold onto some resources it doesn't
    // need to for an extra frame.
    for (size_t i = 0; i < unused_resources_for_child_compositor_.size(); ++i) {
      frame_data_->resource_list.push_back(
          unused_resources_for_child_compositor_[i]);
    }
    unused_resources_for_child_compositor_.clear();
  } else {
    frame_size_ = gfx::Size();
  }
  SetNeedsCommit();
}

void DelegatedRendererLayer::TakeUnusedResourcesForChildCompositor(
    TransferableResourceArray* array) {
  DCHECK(array->empty());
  array->clear();

  array->swap(unused_resources_for_child_compositor_);
}

bool DelegatedRendererLayer::BlocksPendingCommit() const {
  // The active frame needs to be replaced and resources returned before the
  // commit is called complete. This is true even whenever there may be
  // resources to return, regardless of if the layer will draw in its new
  // state.
  return true;
}

}  // namespace cc