WIP: Propagate SurfaceID up window tree hierarchy

services/ui/surfaces/display_compositor.h

-// Copyright 2016 The Chromium Authors. All rights reserved.
+// Copyright 2015 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.
 
 #ifndef SERVICES_UI_SURFACES_DISPLAY_COMPOSITOR_H_
 #define SERVICES_UI_SURFACES_DISPLAY_COMPOSITOR_H_
 
-#include "cc/surfaces/display_client.h"
-#include "cc/surfaces/surface.h"
-#include "cc/surfaces/surface_factory.h"
-#include "cc/surfaces/surface_factory_client.h"
-#include "cc/surfaces/surface_id_allocator.h"
-#include "services/ui/surfaces/surfaces_state.h"
-#include "ui/gfx/native_widget_types.h"
+#include <stdint.h>
+
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "cc/surfaces/surface_manager.h"
 
 namespace cc {
-class Display;
-}
-
-namespace gpu {
-class GpuChannelHost;
-}
+class SurfaceHittest;
+class SurfaceManager;
+}  // namespace cc
 
 namespace ui {
+namespace surfaces {
 
-// TODO(fsamuel): This should become a mojo interface for the mus-gpu split.
-// TODO(fsamuel): This should not be a SurfaceFactoryClient.
-// The DisplayCompositor receives CompositorFrames from all sources,
-// creates a top-level CompositorFrame once per tick, and generates graphical
-// output.
-class DisplayCompositor : public cc::SurfaceFactoryClient,
-                          public cc::DisplayClient {
+class DisplayCompositorClient;
+
+// The DisplayCompositor object is an object global to the Window Manager app
+// that holds the SurfaceManager and allocates new Surfaces namespaces.
+// This object lives on the main thread of the Window Manager.
+// TODO(rjkroege, fsamuel): This object will need to change to support multiple
+// displays.
+class DisplayCompositor : public base::RefCounted<DisplayCompositor>,
+                          public cc::SurfaceManager::Delegate {
  public:
-  DisplayCompositor(scoped_refptr<base::SingleThreadTaskRunner> task_runner,
-                    gfx::AcceleratedWidget widget,
-                    scoped_refptr<gpu::GpuChannelHost> gpu_channel,
-                    const scoped_refptr<SurfacesState>& surfaces_state);
+  explicit DisplayCompositor(DisplayCompositorClient* client);
+
+  uint32_t next_client_id() { return next_client_id_++; }
+
+  cc::SurfaceManager* manager() { return &manager_; }
+
+ private:
+  friend class base::RefCounted<DisplayCompositor>;
   ~DisplayCompositor() override;
 
-  // DisplayCompositor embedders submit a CompositorFrame when content on the
-  // display should be changed. A well-behaving embedder should only submit
-  // a CompositorFrame once per BeginFrame tick. The callback is called the
-  // first time this frame is used to draw, or if the frame is discarded.
-  void SubmitCompositorFrame(cc::CompositorFrame frame,
-                             const base::Callback<void()>& callback);
+  // cc::SurfaceManager::Delegate:
+  void OnSurfaceCreated(const gfx::Size& size,
+                        float device_scale_factor,
+                        const cc::SurfaceId& surface_id) override;
 
-  // TODO(fsamuel): This is used for surface hittesting and should not be
-  // exposed outside of DisplayCompositor.
-  const cc::SurfaceId& surface_id() const { return surface_id_; }
+  DisplayCompositorClient* const client_;
+  // A Surface ID is an unsigned 64-bit int where the high 32-bits are generated
+  // by the Surfaces service, and the low 32-bits are generated by the process
+  // that requested the Surface.
+  uint32_t next_client_id_;
+  cc::SurfaceManager manager_;
 
-  // This requests the display CompositorFrame be rendered and given to the
-  // callback within CopyOutputRequest.
-  void RequestCopyOfOutput(
-      std::unique_ptr<cc::CopyOutputRequest> output_request);
-
-  // TODO(fsamuel): Invent an async way to create a SurfaceNamespace
-  // A SurfaceNamespace can create CompositorFrameSinks where the client can
-  // make up the ID.
-
- private:
-  // SurfaceFactoryClient implementation.
-  void ReturnResources(const cc::ReturnedResourceArray& resources) override;
-  void SetBeginFrameSource(cc::BeginFrameSource* begin_frame_source) override;
-
-  // DisplayClient implementation.
-  void DisplayOutputSurfaceLost() override;
-  void DisplayWillDrawAndSwap(bool will_draw_and_swap,
-                              const cc::RenderPassList& render_passes) override;
-  void DisplayDidDrawAndSwap() override;
-
-  scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
-  scoped_refptr<SurfacesState> surfaces_state_;
-  cc::SurfaceFactory factory_;
-  cc::SurfaceIdAllocator allocator_;
-  cc::SurfaceId surface_id_;
-
-  gfx::Size display_size_;
-  std::unique_ptr<cc::Display> display_;
   DISALLOW_COPY_AND_ASSIGN(DisplayCompositor);
 };
 
+}  // namespace surfaces
 }  // namespace ui
 
-#endif  // SERVICES_UI_SURFACES_DISPLAY_COMPOSITOR_H_
+#endif  //  SERVICES_UI_SURFACES_DISPLAY_COMPOSITOR_H_