exo: Recreate Surface resources on context lost.

components/exo/surface.h

 // 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 COMPONENTS_EXO_SURFACE_H_
 #define COMPONENTS_EXO_SURFACE_H_
 
 #include <list>
 #include <memory>
 #include <set>
 #include <utility>
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/observer_list.h"
 #include "cc/resources/transferable_resource.h"
 #include "cc/surfaces/surface_factory_client.h"
 #include "third_party/skia/include/core/SkRegion.h"
 #include "third_party/skia/include/core/SkXfermode.h"
 #include "ui/aura/window.h"
+#include "ui/compositor/compositor.h"
 #include "ui/compositor/layer_owner_delegate.h"
 #include "ui/gfx/geometry/rect.h"
 
 namespace base {
 namespace trace_event {
 class TracedValue;
 }
 }
 
 namespace cc {
@@ skipping 46 matching lines @@
            std::pair<scoped_refptr<SurfaceFactoryOwner>,
                      std::unique_ptr<cc::SingleReleaseCallback>>>
       release_callbacks_;
   std::unique_ptr<cc::SurfaceIdAllocator> id_allocator_;
   std::unique_ptr<cc::SurfaceFactory> surface_factory_;
   Surface* surface_;
 };
 
 // This class represents a rectangular area that is displayed on the screen.
 // It has a location, size and pixel contents.
-class Surface : public ui::LayerOwnerDelegate {
+class Surface : public ui::LayerOwnerDelegate,
+                public ui::ContextFactoryObserver {
  public:
   typedef void (*PropertyDeallocator)(int64_t value);
 
   Surface();
   ~Surface() override;
 
   // Type-checking downcast routine.
   static Surface* AsSurface(const aura::Window* window);
 
   aura::Window* window() { return window_.get(); }
@@ skipping 99 matching lines @@
   // Returns a trace value representing the state of the surface.
   std::unique_ptr<base::trace_event::TracedValue> AsTracedValue() const;
 
   bool HasPendingDamageForTesting(const gfx::Rect& damage) const {
     return pending_damage_.contains(gfx::RectToSkIRect(damage));
   }
 
   // Overridden from ui::LayerOwnerDelegate:
   void OnLayerRecreated(ui::Layer* old_layer, ui::Layer* new_layer) override;
 
+  // Overridden from ui::ContextFactoryObserver.
+  void OnLostResources() override;
+
   void WillDraw(cc::SurfaceId surface_id);
 
   // Check whether this Surface and its children need to create new cc::Surface
   // IDs for their contents next time they get new buffer contents.
   void CheckIfSurfaceHierarchyNeedsCommitToNewSurfaces();
 
   gfx::Size content_size() const { return content_size_; }
 
   // Sets the |value| of the given surface |property|. Setting to the default
   // value (e.g., NULL) removes the property. The caller is responsible for the
@@ skipping 39 matching lines @@
   // Returns true if this surface or any child surface needs a commit and has
   // has_pending_layer_changes_ true.
   bool HasLayerHierarchyChanged() const;
 
   // Sets that all children must create new cc::SurfaceIds for their contents.
   void SetSurfaceHierarchyNeedsCommitToNewSurfaces();
 
   // Set SurfaceLayer contents to the current buffer.
   void SetSurfaceLayerContents(ui::Layer* layer);
 
+  // Updates current_resource_ with a new resource id corresponding to the
+  // contents of the attached buffer (or id 0, if no buffer is attached).
+  // UpdateSurface must be called afterwards to ensure the release callback
+  // will be called.
+  void CreateResource(bool for_commit);
+
+  // Updates the current Surface with a new frame referring to the resource in
+  // current_resource_.
+  void UpdateSurface(bool for_commit);
+
   int64_t SetPropertyInternal(const void* key,
                               const char* name,
                               PropertyDeallocator deallocator,
                               int64_t value,
                               int64_t default_value);
   int64_t GetPropertyInternal(const void* key, int64_t default_value) const;
 
   // This returns true when the surface has some contents assigned to it.
   bool has_contents() const { return !!current_buffer_; }
 
@@ skipping 52 matching lines @@
   // The stack of sub-surfaces to take effect when Commit() is called.
   // Bottom-most sub-surface at the front of the list and top-most sub-surface
   // at the back.
   using SubSurfaceEntry = std::pair<Surface*, gfx::Point>;
   using SubSurfaceEntryList = std::list<SubSurfaceEntry>;
   SubSurfaceEntryList pending_sub_surfaces_;
 
   // The buffer that is currently set as content of surface.
   base::WeakPtr<Buffer> current_buffer_;
 
+  bool frame_is_opaque_ = false;
+
   // The last resource that was sent to a surface.
   cc::TransferableResource current_resource_;
 
   // This is true if a call to Commit() as been made but
   // CommitSurfaceHierarchy() has not yet been called.
   bool needs_commit_surface_hierarchy_;
 
   // This is set when the compositing starts and passed to active frame
   // callbacks when compositing successfully ends.
   base::TimeTicks last_compositing_start_time_;
@@ skipping 16 matching lines @@
 
   // Surface observer list. Surface does not own the observers.
   base::ObserverList<SurfaceObserver, true> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(Surface);
 };
 
 }  // namespace exo
 
 #endif  // COMPONENTS_EXO_SURFACE_H_