cc/layers/surface_layer.cc

// 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/layers/surface_layer.h"

#include "cc/base/swap_promise.h"
#include "cc/layers/surface_layer_impl.h"
#include "cc/trees/layer_tree_host.h"

namespace cc {

class SatisfySwapPromise : public SwapPromise {
 public:
  SatisfySwapPromise(SurfaceSequence sequence,
                     const SurfaceLayer::SatisfyCallback& satisfy_callback)
      : sequence_(sequence), satisfy_callback_(satisfy_callback) {}

  ~SatisfySwapPromise() override {}

 private:
  void DidSwap(CompositorFrameMetadata* metadata) override {
    metadata->satisfies_sequences.push_back(sequence_.sequence);
  }

  void DidNotSwap(DidNotSwapReason reason) override {
    satisfy_callback_.Run(sequence_);
  }
  int64 TraceId() const override { return 0; }

  SurfaceSequence sequence_;
  SurfaceLayer::SatisfyCallback satisfy_callback_;

  DISALLOW_COPY_AND_ASSIGN(SatisfySwapPromise);
};

scoped_refptr<SurfaceLayer> SurfaceLayer::Create(
    const SatisfyCallback& satisfy_callback,
    const RequireCallback& require_callback) {
  return make_scoped_refptr(
      new SurfaceLayer(satisfy_callback, require_callback));
}

SurfaceLayer::SurfaceLayer(const SatisfyCallback& satisfy_callback,
                           const RequireCallback& require_callback)
    : Layer(),
      satisfy_callback_(satisfy_callback),
      require_callback_(require_callback) {
}

SurfaceLayer::~SurfaceLayer() {
  DCHECK(!layer_tree_host());
  DCHECK(destroy_sequence_.is_null());
}

void SurfaceLayer::SetSurfaceId(SurfaceId surface_id, const gfx::Size& size) {
  SatisfyDestroySequence();
  surface_id_ = surface_id;
  surface_size_ = size;
  CreateNewDestroySequence();

  UpdateDrawsContent(HasDrawableContent());
  SetNeedsPushProperties();
}

scoped_ptr<LayerImpl> SurfaceLayer::CreateLayerImpl(LayerTreeImpl* tree_impl) {
  return SurfaceLayerImpl::Create(tree_impl, id());
}

bool SurfaceLayer::HasDrawableContent() const {
  return !surface_id_.is_null() && Layer::HasDrawableContent();
}

void SurfaceLayer::SetLayerTreeHost(LayerTreeHost* host) {
  if (layer_tree_host() == host) {
    Layer::SetLayerTreeHost(host);
    return;
  }

  SatisfyDestroySequence();
  Layer::SetLayerTreeHost(host);
  CreateNewDestroySequence();
}

void SurfaceLayer::PushPropertiesTo(LayerImpl* layer) {
  Layer::PushPropertiesTo(layer);
  SurfaceLayerImpl* layer_impl = static_cast<SurfaceLayerImpl*>(layer);

  layer_impl->SetSurfaceId(surface_id_);
}

void SurfaceLayer::CalculateContentsScale(float ideal_contents_scale,
                                          float* contents_scale_x,
                                          float* contents_scale_y,
                                          gfx::Size* content_bounds) {
  *content_bounds = surface_size_;
  *contents_scale_x =
      bounds().IsEmpty() ? 1.f : static_cast<float>(content_bounds->width()) /
                                     bounds().width();
  *contents_scale_y =
      bounds().IsEmpty() ? 1.f : static_cast<float>(content_bounds->height()) /
                                     bounds().height();
}

void SurfaceLayer::CreateNewDestroySequence() {
  DCHECK(destroy_sequence_.is_null());
  if (layer_tree_host()) {
    destroy_sequence_ = layer_tree_host()->CreateSurfaceSequence();
    require_callback_.Run(surface_id_, destroy_sequence_);
  }
}

void SurfaceLayer::SatisfyDestroySequence() {
  if (!layer_tree_host())
    return;
  DCHECK(!destroy_sequence_.is_null());
  scoped_ptr<SatisfySwapPromise> satisfy(
      new SatisfySwapPromise(destroy_sequence_, satisfy_callback_));
  layer_tree_host()->QueueSwapPromise(satisfy.Pass());
  destroy_sequence_ = SurfaceSequence();
}

}  // namespace cc