Add DirectComposition overlay support.

gpu/ipc/service/direct_composition_surface_win.h

 // Copyright 2017 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 GPU_IPC_SERVICE_DIRECT_COMPOSITION_SURFACE_WIN_H_
 #define GPU_IPC_SERVICE_DIRECT_COMPOSITION_SURFACE_WIN_H_
 
 #include <d3d11.h>
 #include <dcomp.h>
 #include <windows.h>
 
 #include "base/memory/weak_ptr.h"
 #include "base/win/scoped_comptr.h"
 #include "gpu/gpu_export.h"
 #include "gpu/ipc/service/child_window_win.h"
 #include "gpu/ipc/service/image_transport_surface_delegate.h"
 #include "ui/gl/gl_image.h"
 #include "ui/gl/gl_surface_egl.h"
 
 namespace gpu {
 
+class DCLayerTree;
+
 class GPU_EXPORT DirectCompositionSurfaceWin : public gl::GLSurfaceEGL {
  public:
   DirectCompositionSurfaceWin(
       base::WeakPtr<ImageTransportSurfaceDelegate> delegate,
       HWND parent_window);
 
   // Returns true if there's an output on the current adapter that can
   // use overlays.
   static bool AreOverlaysSupported();
 
   bool InitializeNativeWindow();
 
   // GLSurfaceEGL implementation.
   using GLSurfaceEGL::Initialize;
   bool Initialize(gl::GLSurfaceFormat format) override;
   void Destroy() override;
   gfx::Size GetSize() override;
   bool IsOffscreen() override;
   void* GetHandle() override;
   bool Resize(const gfx::Size& size,
               float scale_factor,
               bool has_alpha) override;
   gfx::SwapResult SwapBuffers() override;
   gfx::SwapResult PostSubBuffer(int x, int y, int width, int height) override;
   gfx::VSyncProvider* GetVSyncProvider() override;
-  bool ScheduleOverlayPlane(int z_order,
-                            gfx::OverlayTransform transform,
-                            gl::GLImage* image,
-                            const gfx::Rect& bounds_rect,
-                            const gfx::RectF& crop_rect) override;
   bool SetEnableDCLayers(bool enable) override;
   bool FlipsVertically() const override;
   bool SupportsPostSubBuffer() override;
   bool OnMakeCurrent(gl::GLContext* context) override;
   bool SupportsDCLayers() const override;
   bool SetDrawRectangle(const gfx::Rect& rect) override;
   gfx::Vector2d GetDrawOffset() const override;
 
+  // This schedules an overlay plane to be displayed on the next SwapBuffers
+  // or PostSubBuffer call. Overlay planes must be scheduled before every swap
+  // to remain in the layer tree. This surface's backbuffer doesn't have to be
+  // scheduled with ScheduleDCLayer, as it's automatically placed in the layer
+  // tree at z-order 0.
+  bool ScheduleDCLayer(const ui::DCRendererLayerParams& params) override;
+
   bool Initialize(std::unique_ptr<gfx::VSyncProvider> vsync_provider);
 
+  const base::win::ScopedComPtr<IDCompositionSurface>& dcomp_surface() const {
+    return dcomp_surface_;
+  }
+
   scoped_refptr<base::TaskRunner> GetWindowTaskRunnerForTesting();
-  base::win::ScopedComPtr<IDXGISwapChain1> swap_chain() const {
+  const base::win::ScopedComPtr<IDXGISwapChain1>& swap_chain() const {
     return swap_chain_;
   }
 
  protected:
   ~DirectCompositionSurfaceWin() override;
 
  private:
-  struct Overlay {
-    Overlay(int z_order,
-            gfx::OverlayTransform transform,
-            scoped_refptr<gl::GLImage> image,
-            gfx::Rect bounds_rect,
-            gfx::RectF crop_rect);
-    Overlay(const Overlay& overlay);
-
-    ~Overlay();
-
-    int z_order;
-    gfx::OverlayTransform transform;
-    scoped_refptr<gl::GLImage> image;
-    gfx::Rect bounds_rect;
-    gfx::RectF crop_rect;
-  };
-
-  bool CommitAndClearPendingOverlays();
   void ReleaseCurrentSurface();
   void InitializeSurface();
   // Release the texture that's currently being drawn to. If will_discard is
   // true then the surface should be discarded without swapping any contents
   // to it.
   void ReleaseDrawTexture(bool will_discard);
 
   ChildWindowWin child_window_;
 
   HWND window_ = nullptr;
   // This is a placeholder surface used when not rendering to the
   // DirectComposition surface.
   EGLSurface default_surface_ = 0;
 
   // This is the real surface representing the backbuffer. It may be null
   // outside of a BeginDraw/EndDraw pair.
   EGLSurface real_surface_ = 0;
   gfx::Size size_ = gfx::Size(1, 1);
   bool first_swap_ = true;
   bool enable_dc_layers_ = false;
   std::unique_ptr<gfx::VSyncProvider> vsync_provider_;
-  std::vector<Overlay> pending_overlays_;
   gfx::Rect swap_rect_;
-
+  std::unique_ptr<DCLayerTree> layer_tree_;
   gfx::Vector2d draw_offset_;
 
   base::win::ScopedComPtr<ID3D11Device> d3d11_device_;
   base::win::ScopedComPtr<IDCompositionDevice2> dcomp_device_;
-  base::win::ScopedComPtr<IDCompositionTarget> dcomp_target_;
-  base::win::ScopedComPtr<IDCompositionVisual2> visual_;
   base::win::ScopedComPtr<IDCompositionSurface> dcomp_surface_;
   base::win::ScopedComPtr<IDXGISwapChain1> swap_chain_;
   base::win::ScopedComPtr<ID3D11Texture2D> draw_texture_;
 
   // Keep track of whether the texture has been rendered to, as the first draw
   // to it must overwrite the entire thing.
   bool has_been_rendered_to_ = false;
 
   DISALLOW_COPY_AND_ASSIGN(DirectCompositionSurfaceWin);
 };
 
 }  // namespace gpu
 
 #endif  // GPU_IPC_SERVICE_DIRECT_COMPOSITION_SURFACE_WIN_H_