Shared Raster Worker Threads

cc/resources/raster_worker_pool.h

 // Copyright 2013 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_RASTER_WORKER_POOL_H_
 #define CC_RESOURCES_RASTER_WORKER_POOL_H_
 
 #include <vector>
 
 #include "base/containers/hash_tables.h"
@@ skipping 170 matching lines @@
   // Once scheduled, reply callbacks are guaranteed to run for all tasks
   // even if they later get canceled by another call to ScheduleTasks().
   virtual void ScheduleTasks(RasterTask::Queue* queue) = 0;
 
   // Returns the target that needs to be used for raster task resources.
   virtual GLenum GetResourceTarget() const = 0;
 
   // Returns the format that needs to be used for raster task resources.
   virtual ResourceFormat GetResourceFormat() const = 0;
 
+  // Sets the number of threads to use for running raster tasks.
+  // Can only be called once prior to GetNumRasterThreads().
+  // Caller is responsible for correct ordering.
+  static void SetNumRasterThreads(int num_threads);
+
   // TODO(vmpstr): Figure out an elegant way to not pass this many parameters.
   static RasterTask CreateRasterTask(
       const Resource* resource,
       PicturePileImpl* picture_pile,
       gfx::Rect content_rect,
       float contents_scale,
       RasterMode raster_mode,
       TileResolution tile_resolution,
       int layer_id,
       const void* tile_id,
@@ skipping 10 matching lines @@
 
  protected:
   typedef std::vector<scoped_refptr<internal::WorkerPoolTask> > TaskVector;
   typedef std::vector<scoped_refptr<internal::RasterWorkerPoolTask> >
       RasterTaskVector;
   typedef base::hash_set<internal::RasterWorkerPoolTask*> RasterTaskSet;
   typedef internal::RasterWorkerPoolTask* TaskMapKey;
   typedef base::hash_map<TaskMapKey,
                          scoped_refptr<internal::WorkerPoolTask> > TaskMap;
 
-  RasterWorkerPool(ResourceProvider* resource_provider, size_t num_threads);
+  explicit RasterWorkerPool(ResourceProvider* resource_provider);
 
   virtual void OnRasterTasksFinished() = 0;
   virtual void OnRasterTasksRequiredForActivationFinished() = 0;
 
   void SetRasterTasks(RasterTask::Queue* queue);
   bool IsRasterTaskRequiredForActivation(
       internal::RasterWorkerPoolTask* task) const;
 
   RasterWorkerPoolClient* client() const { return client_; }
   ResourceProvider* resource_provider() const { return resource_provider_; }
@@ skipping 41 matching lines @@
 
   scoped_refptr<internal::WorkerPoolTask> raster_finished_task_;
   scoped_refptr<internal::WorkerPoolTask>
       raster_required_for_activation_finished_task_;
   base::WeakPtrFactory<RasterWorkerPool> weak_ptr_factory_;
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_RASTER_WORKER_POOL_H_