cc: Add initial GPU-to-GPU copy rasterizer implementation.

cc/resources/image_copy_raster_worker_pool.h

+// 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.
+
+#ifndef CC_RESOURCES_IMAGE_COPY_RASTER_WORKER_POOL_H_
+#define CC_RESOURCES_IMAGE_COPY_RASTER_WORKER_POOL_H_
+
+#include <vector>
+
+#include "base/memory/weak_ptr.h"
+#include "base/values.h"
+#include "cc/resources/raster_worker_pool.h"
+#include "cc/resources/rasterizer.h"
+
+namespace cc {
+class ResourcePool;
+class ResourceProvider;
+class ScopedResource;
+
+class CC_EXPORT ImageCopyRasterWorkerPool : public RasterWorkerPool,
+                                            public Rasterizer,
+                                            public RasterizerTaskClient {
+ public:
+  virtual ~ImageCopyRasterWorkerPool();
+
+  static scoped_ptr<RasterWorkerPool> Create(
+      base::SequencedTaskRunner* task_runner,
+      TaskGraphRunner* task_graph_runner,
+      ResourceProvider* resource_provider,
+      ResourcePool* resource_pool);
+
+  // Overridden from RasterWorkerPool:
+  virtual Rasterizer* AsRasterizer() OVERRIDE;
+
+  // Overridden from Rasterizer:
+  virtual void SetClient(RasterizerClient* client) OVERRIDE;
+  virtual void Shutdown() OVERRIDE;
+  virtual void ScheduleTasks(RasterTaskQueue* queue) OVERRIDE;
+  virtual void CheckForCompletedTasks() OVERRIDE;
+
+  // Overridden from RasterizerTaskClient:
+  virtual SkCanvas* AcquireCanvasForRaster(RasterTask* task) OVERRIDE;
+  virtual void ReleaseCanvasForRaster(RasterTask* task) OVERRIDE;
+
+ protected:
+  ImageCopyRasterWorkerPool(base::SequencedTaskRunner* task_runner,
+                            TaskGraphRunner* task_graph_runner,
+                            ResourceProvider* resource_provider,
+                            ResourcePool* resource_pool);
+
+ private:
+  struct RasterTaskState {
+    class TaskComparator {
+     public:
+      explicit TaskComparator(const RasterTask* task) : task_(task) {}
+
+      bool operator()(const RasterTaskState& state) const {
+        return state.task == task_;
+      }
+
+     private:
+      const RasterTask* task_;
+    };
+
+    typedef std::vector<RasterTaskState> Vector;
+
+    RasterTaskState(const RasterTask* task, ScopedResource* resource)
+        : task(task), resource(resource) {}
+
+    const RasterTask* task;
+    ScopedResource* resource;
+  };
+
+  void OnRasterFinished();
+  void OnRasterRequiredForActivationFinished();
+  void FlushCopies();
+  scoped_ptr<base::Value> StateAsValue() const;
+  scoped_ptr<base::Value> StagingStateAsValue() const;
+
+  scoped_refptr<base::SequencedTaskRunner> task_runner_;
+  TaskGraphRunner* task_graph_runner_;
+  const NamespaceToken namespace_token_;
+  RasterizerClient* client_;
+  ResourceProvider* resource_provider_;
+  ResourcePool* resource_pool_;
+
+  RasterTaskState::Vector raster_task_states_;
+
+  bool has_performed_copy_since_last_flush_;
+
+  bool raster_tasks_pending_;
+  bool raster_tasks_required_for_activation_pending_;
+
+  base::WeakPtrFactory<ImageCopyRasterWorkerPool>
+      raster_finished_weak_ptr_factory_;
+
+  scoped_refptr<RasterizerTask> raster_finished_task_;
+  scoped_refptr<RasterizerTask> raster_required_for_activation_finished_task_;
+
+  // Task graph used when scheduling tasks and vector used to gather
+  // completed tasks.
+  TaskGraph graph_;
+  Task::Vector completed_tasks_;
+
+  DISALLOW_COPY_AND_ASSIGN(ImageCopyRasterWorkerPool);
+};
+
+}  // namespace cc
+
+#endif  // CC_RESOURCES_IMAGE_COPY_RASTER_WORKER_POOL_H_