Establish mojo service between Canvas (blink) and SurfaceManager (browser)

content/browser/renderer_host/offscreen_canvas_surface_service_impl.cc

+// Copyright 2016 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 "content/browser/renderer_host/offscreen_canvas_surface_service_impl.h"
+
+#include "base/bind_helpers.h"
+#include "cc/surfaces/surface.h"
+#include "cc/surfaces/surface_manager.h"
+#include "content/browser/compositor/surface_utils.h"
+#include "content/public/browser/browser_thread.h"
+
+namespace mojo {
+
+template <>
+struct TypeConverter<cc::SurfaceId, blink::mojom::SurfaceIdPtr> {
+    static cc::SurfaceId Convert(const blink::mojom::SurfaceIdPtr& input) {

[Fady Samuel, 2016/06/02 22:32:23]

Please avoid using type converters.

+        return input ?
+            cc::SurfaceId(input->id_namespace, input->local_id, input->nonce) :
+            cc::SurfaceId();
+    }
+};
+
+template <>
+struct TypeConverter<blink::mojom::SurfaceIdPtr, cc::SurfaceId> {
+    static blink::mojom::SurfaceIdPtr Convert(const cc::SurfaceId& input) {
+        blink::mojom::SurfaceIdPtr result = blink::mojom::SurfaceId::New();
+        result->id_namespace = input.id_namespace();
+        result->local_id = input.local_id();
+        result->nonce = input.nonce();
+        return result;
+    }
+};
+
+template <>
+struct TypeConverter<cc::SurfaceSequence, blink::mojom::SurfaceSequencePtr> {
+    static cc::SurfaceSequence Convert(
+            const blink::mojom::SurfaceSequencePtr& input) {
+        return input ? cc::SurfaceSequence(input->id_namespace, input->sequence)
+            : cc::SurfaceSequence();
+    }
+};
+
+template <>
+struct TypeConverter<blink::mojom::SurfaceSequencePtr, cc::SurfaceSequence> {
+    static blink::mojom::SurfaceSequencePtr Convert(
+            const cc::SurfaceSequence& input) {
+        blink::mojom::SurfaceSequencePtr result =
+            blink::mojom::SurfaceSequence::New();
+        result->id_namespace = input.id_namespace;
+        result->sequence = input.sequence;
+        return result;
+    }
+};
+
+} // namespace mojo
+
+namespace content {
+
+// static
+void OffscreenCanvasSurfaceServiceImpl::Create(
+    mojo::InterfaceRequest<blink::mojom::OffscreenCanvasSurfaceService> request)
+{
+  // |binding_| will take ownership of OffscreenCanvasSurfaceServiceImpl
+  new OffscreenCanvasSurfaceServiceImpl(std::move(request));
+}
+
+OffscreenCanvasSurfaceServiceImpl::OffscreenCanvasSurfaceServiceImpl(
+    mojo::InterfaceRequest<blink::mojom::OffscreenCanvasSurfaceService> request)
+    : binding_(this, std::move(request))
+{
+    id_allocator_ = CreateSurfaceIdAllocator();
+}
+
+OffscreenCanvasSurfaceServiceImpl::~OffscreenCanvasSurfaceServiceImpl()
+{
+    if (surface_factory_) {
+        surface_factory_->DestroyAll();
+    }
+}
+
+void OffscreenCanvasSurfaceServiceImpl::GetSurfaceId(
+    const GetSurfaceIdCallback& callback) {
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
+
+  cc::SurfaceId surface_id = id_allocator_->GenerateId();
+
+  blink::mojom::SurfaceIdPtr surface_id_ptr =
+      mojo::ConvertTo<blink::mojom::SurfaceIdPtr>(surface_id);
+  callback.Run(std::move(surface_id_ptr));

[Fady Samuel, 2016/06/02 22:32:23]

This shouldn't need to be sync.

+}
+
+void OffscreenCanvasSurfaceServiceImpl::RequestSurfaceCreation(
+    const blink::mojom::SurfaceIdPtr surface_id)
+{
+    cc::SurfaceManager* manager = GetSurfaceManager();
+    if (!surface_factory_) {
+        surface_factory_ = base::WrapUnique(
+                new cc::SurfaceFactory(manager, this));
+    }
+    surface_factory_->Create(mojo::ConvertTo<cc::SurfaceId>(surface_id));
+}
+
+void OffscreenCanvasSurfaceServiceImpl::Require(
+    blink::mojom::SurfaceIdPtr surface_id,
+    blink::mojom::SurfaceSequencePtr sequence)
+{
+    cc::SurfaceManager* manager = GetSurfaceManager();
+    cc::Surface* surface = manager->GetSurfaceForId(
+            mojo::ConvertTo<cc::SurfaceId>(surface_id));
+    if (!surface) {
+        LOG(ERROR) << "Attempting to require callback on nonexistent surface";
+        return;
+    }
+    surface->AddDestructionDependency(
+            mojo::ConvertTo<cc::SurfaceSequence>(sequence));
+}
+
+void OffscreenCanvasSurfaceServiceImpl::Satisfy(
+    blink::mojom::SurfaceSequencePtr sequence)
+{
+    cc::SurfaceSequence ccSequence =
+        mojo::ConvertTo<cc::SurfaceSequence>(sequence);
+    std::vector<uint32_t> sequences;
+    sequences.push_back(ccSequence.sequence);
+    cc::SurfaceManager* manager = GetSurfaceManager();
+    manager->DidSatisfySequences(ccSequence.id_namespace, &sequences);
+}
+
+// TODO: Implement cc::SurfaceFactoryClient functions for resources return.
+void OffscreenCanvasSurfaceServiceImpl::ReturnResources(
+        const cc::ReturnedResourceArray& resources)
+{
+}
+
+void OffscreenCanvasSurfaceServiceImpl::WillDrawSurface(
+        cc::SurfaceId id, const gfx::Rect& damage_rect)
+{
+}
+
+void OffscreenCanvasSurfaceServiceImpl::SetBeginFrameSource(
+        cc::BeginFrameSource* begin_frame_source)
+{
+}
+
+} // namespace content