Introducing SurfaceReferenceFactory

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 <stdint.h>
 
 #include "base/macros.h"
 #include "base/trace_event/trace_event.h"
 #include "cc/layers/surface_layer_impl.h"
 #include "cc/output/swap_promise.h"
 #include "cc/surfaces/surface_sequence_generator.h"
 #include "cc/trees/layer_tree_host.h"
 #include "cc/trees/swap_promise_manager.h"
 
 namespace cc {
 
 class SatisfySwapPromise : public SwapPromise {
  public:
-  SatisfySwapPromise(SurfaceSequence sequence,
-                     const SurfaceLayer::SatisfyCallback& satisfy_callback)
-      : sequence_(sequence), satisfy_callback_(satisfy_callback) {}
+  explicit SatisfySwapPromise(SurfaceEmbeddingPtr surface_ref)
+      : surface_ref_(std::move(surface_ref)) {}
 
   ~SatisfySwapPromise() override {}
 
  private:
   void DidActivate() override {}
   void DidSwap(CompositorFrameMetadata* metadata) override {
-    metadata->satisfies_sequences.push_back(sequence_.sequence);
+    surface_ref_->DelegateReference(metadata);
   }
 
   DidNotSwapAction DidNotSwap(DidNotSwapReason reason) override {
-    satisfy_callback_.Run(sequence_);
+    surface_ref_->RemoveReference();
     return DidNotSwapAction::BREAK_PROMISE;
   }
   int64_t TraceId() const override { return 0; }
 
-  SurfaceSequence sequence_;
-  SurfaceLayer::SatisfyCallback satisfy_callback_;
+  SurfaceEmbeddingPtr surface_ref_;
 
   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));
+scoped_refptr<SurfaceLayer> SurfaceLayer::Create() {
+  return make_scoped_refptr(new SurfaceLayer());
 }
 
-SurfaceLayer::SurfaceLayer(const SatisfyCallback& satisfy_callback,
-                           const RequireCallback& require_callback)
-    : surface_scale_(1.f),
-      satisfy_callback_(satisfy_callback),
-      require_callback_(require_callback) {}
+scoped_refptr<SurfaceLayer> SurfaceLayer::Create(
+    SurfaceEmbeddingPtr surface_ref) {
+  return make_scoped_refptr(new SurfaceLayer(std::move(surface_ref)));
+}
+
+SurfaceLayer::SurfaceLayer() {}
+
+SurfaceLayer::SurfaceLayer(SurfaceEmbeddingPtr surface_ref) {
+  SetSurfaceEmbedding(std::move(surface_ref));
+}
 
 SurfaceLayer::~SurfaceLayer() {
   DCHECK(!layer_tree_host());
-  DCHECK(!destroy_sequence_.is_valid());
 }
 
-void SurfaceLayer::SetSurfaceId(const SurfaceId& surface_id,
-                                float scale,
-                                const gfx::Size& size) {
-  SatisfyDestroySequence();
-  surface_id_ = surface_id;
-  surface_size_ = size;
-  surface_scale_ = scale;
-  CreateNewDestroySequence();
-
+void SurfaceLayer::SetSurfaceEmbedding(SurfaceEmbeddingPtr surface_ref) {
+  RemoveCurrentReference();
+  surface_emb_ = std::move(surface_ref);
+  if (layer_tree_host())
+    current_ref_ = surface_emb_->CreateReference(layer_tree_host());
   UpdateDrawsContent(HasDrawableContent());
   SetNeedsPushProperties();
 }
 
 std::unique_ptr<LayerImpl> SurfaceLayer::CreateLayerImpl(
     LayerTreeImpl* tree_impl) {
   return SurfaceLayerImpl::Create(tree_impl, id());
 }
 
 bool SurfaceLayer::HasDrawableContent() const {
-  return surface_id_.is_valid() && Layer::HasDrawableContent();
+  return surface_emb_->id().is_valid() && Layer::HasDrawableContent();
 }
 
 void SurfaceLayer::SetLayerTreeHost(LayerTreeHost* host) {
   if (layer_tree_host() == host) {
     Layer::SetLayerTreeHost(host);
     return;
   }
-
-  SatisfyDestroySequence();
+  RemoveCurrentReference();
   Layer::SetLayerTreeHost(host);
-  CreateNewDestroySequence();
+  if (surface_emb_ && layer_tree_host())
+    current_ref_ = surface_emb_->CreateReference(layer_tree_host());
 }
 
 void SurfaceLayer::PushPropertiesTo(LayerImpl* layer) {
   Layer::PushPropertiesTo(layer);
   TRACE_EVENT0("cc", "SurfaceLayer::PushPropertiesTo");
   SurfaceLayerImpl* layer_impl = static_cast<SurfaceLayerImpl*>(layer);
-
-  layer_impl->SetSurfaceId(surface_id_);
-  layer_impl->SetSurfaceSize(surface_size_);
-  layer_impl->SetSurfaceScale(surface_scale_);
+  layer_impl->SetSurfaceInfo(surface_emb_->info());
 }
 
-void SurfaceLayer::CreateNewDestroySequence() {
-  DCHECK(!destroy_sequence_.is_valid());
-  if (layer_tree_host()) {
-    destroy_sequence_ = layer_tree_host()
-                            ->GetSurfaceSequenceGenerator()
-                            ->CreateSurfaceSequence();
-    require_callback_.Run(surface_id_, destroy_sequence_);
-  }
-}
-
-void SurfaceLayer::SatisfyDestroySequence() {
-  if (!layer_tree_host())
+void SurfaceLayer::RemoveCurrentReference() {
+  if (!current_ref_)
     return;
-  DCHECK(destroy_sequence_.is_valid());
   std::unique_ptr<SatisfySwapPromise> satisfy(
-      new SatisfySwapPromise(destroy_sequence_, satisfy_callback_));
+      new SatisfySwapPromise(std::move(current_ref_)));
   layer_tree_host()->GetSwapPromiseManager()->QueueSwapPromise(
       std::move(satisfy));
-  destroy_sequence_ = SurfaceSequence();
 }
 
 }  // namespace cc