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/threading/thread_task_runner_handle.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(
-      const SurfaceSequence& sequence,
-      const SurfaceLayer::SatisfyCallback& satisfy_callback,
+      std::unique_ptr<SurfaceReferenceBase> surface_ref,
       scoped_refptr<base::SingleThreadTaskRunner> main_task_runner)
-      : sequence_(sequence),
-        satisfy_callback_(satisfy_callback),
+      : surface_ref_(std::move(surface_ref)),
         main_task_runner_(std::move(main_task_runner)) {}
 
   ~SatisfySwapPromise() override {}
 
  private:
   void DidActivate() override {}
+
   void WillSwap(CompositorFrameMetadata* metadata) override {}
+
   void DidSwap() override {
-    // DidSwap could run on compositor thread but satisfy callback must
-    // run on the main thread.
-    main_task_runner_->PostTask(FROM_HERE,
-                                base::Bind(satisfy_callback_, sequence_));
+    main_task_runner_->DeleteSoon(FROM_HERE, surface_ref_.release());
   }
 
   DidNotSwapAction DidNotSwap(DidNotSwapReason reason) override {
-    main_task_runner_->PostTask(FROM_HERE,
-                                base::Bind(satisfy_callback_, sequence_));
+    main_task_runner_->DeleteSoon(FROM_HERE, surface_ref_.release());
     return DidNotSwapAction::BREAK_PROMISE;
   }
+
   int64_t TraceId() const override { return 0; }
 
-  SurfaceSequence sequence_;
-  SurfaceLayer::SatisfyCallback satisfy_callback_;
+  std::unique_ptr<SurfaceReferenceBase> surface_ref_;
   scoped_refptr<base::SingleThreadTaskRunner> main_task_runner_;
 
   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<SurfaceReferenceFactory> ref_factory) {
+  return make_scoped_refptr(new SurfaceLayer(std::move(ref_factory)));
 }
 
-SurfaceLayer::SurfaceLayer(const SatisfyCallback& satisfy_callback,
-                           const RequireCallback& require_callback)
-    : satisfy_callback_(satisfy_callback),
-      require_callback_(require_callback) {}
+SurfaceLayer::SurfaceLayer(scoped_refptr<SurfaceReferenceFactory> ref_factory)
+    : ref_factory_(std::move(ref_factory)) {}
 
 SurfaceLayer::~SurfaceLayer() {
   DCHECK(!layer_tree_host());
-  DCHECK(!destroy_sequence_.is_valid());
 }
 
-void SurfaceLayer::SetSurfaceId(const SurfaceId& surface_id,
-                                float scale,
-                                const gfx::Size& size,
-                                bool stretch_content_to_fill_bounds) {
-  SatisfyDestroySequence();
-  surface_id_ = surface_id;
-  surface_size_ = size;
-  surface_scale_ = scale;
+void SurfaceLayer::SetSurfaceInfo(const SurfaceInfo& surface_info,
+                                  bool stretch_content_to_fill_bounds) {
+  RemoveCurrentReference();
+  surface_info_ = surface_info;
+  if (layer_tree_host()) {
+    current_ref_ =
+        ref_factory_->CreateReference(layer_tree_host(), surface_info_.id());
+  }
   stretch_content_to_fill_bounds_ = stretch_content_to_fill_bounds;
-  CreateNewDestroySequence();
-
   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_info_.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 (layer_tree_host()) {
+    current_ref_ =
+        ref_factory_->CreateReference(layer_tree_host(), surface_info_.id());
+  }
 }
 
 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_info_);
   layer_impl->SetStretchContentToFillBounds(stretch_content_to_fill_bounds_);
 }
 
-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());
-  auto satisfy =
-      base::MakeUnique<SatisfySwapPromise>(destroy_sequence_, satisfy_callback_,
-                                           base::ThreadTaskRunnerHandle::Get());
+  auto swap_promise = base::MakeUnique<SatisfySwapPromise>(
+      std::move(current_ref_), base::ThreadTaskRunnerHandle::Get());
   layer_tree_host()->GetSwapPromiseManager()->QueueSwapPromise(
-      std::move(satisfy));
-  destroy_sequence_ = SurfaceSequence();
+      std::move(swap_promise));
 }
 
 }  // namespace cc