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 <deque>
 #include <vector>
 
@@ skipping 174 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);
+
   // Force a check for completed raster tasks.
   // Calls completion callbacks on completed tasks.
   virtual void CheckForCompletedTasks();
 
   // TODO(vmpstr): Figure out an elegant way to not pass this many parameters.
   static RasterTask CreateRasterTask(
       const Resource* resource,
       PicturePileImpl* picture_pile,
       const gfx::Rect& content_rect,
       float contents_scale,
@@ skipping 18 matching lines @@
   typedef std::vector<scoped_refptr<internal::RasterWorkerPoolTask> >
       RasterTaskVector;
   typedef std::deque<scoped_refptr<internal::RasterWorkerPoolTask> >
       RasterTaskDeque;
   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,
-                   ContextProvider* context_provider,
-                   size_t num_threads);
+                   ContextProvider* context_provider);
 
   virtual void OnRasterTasksFinished() = 0;
   virtual void OnRasterTasksRequiredForActivationFinished() = 0;
 
   void SetRasterTasks(RasterTask::Queue* queue);
   bool IsRasterTaskRequiredForActivation(
       internal::RasterWorkerPoolTask* task) const;
   // Run raster tasks that use GPU on current thread.
   void RunGpuRasterTasks(const RasterTaskVector& tasks);
 
@@ skipping 47 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_