Gpu Image Decode Controller

cc/raster/tile_task_runner.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_RASTER_TILE_TASK_RUNNER_H_
 #define CC_RASTER_TILE_TASK_RUNNER_H_
 
 #include <stdint.h>
 
 #include <vector>
@@ skipping 40 matching lines @@
   ~TileTask() override;
 
   bool did_schedule_;
   bool did_complete_;
 };
 
 class CC_EXPORT ImageDecodeTask : public TileTask {
  public:
   typedef std::vector<scoped_refptr<ImageDecodeTask>> Vector;
 
+  // Whether this ImageDecodeTask can be run at the same time as other tasks in
+  // the task graph. If false, this task will be scheduled with
+  // TASK_CATEGORY_NONCONCURRENT_FOREGROUND. The base implementation always
+  // returns true.
+  virtual bool SupportsConcurrentExecution() const;
+
+  // Returns an optional task which this task depends on. May be null.
+  scoped_refptr<ImageDecodeTask> dependency() { return dependency_; }

[vmpstr, 2016/03/25 22:37:29]

const scoped_refptr& to avoid unnecessary refs. 

[ericrk, 2016/03/28 22:10:51]

Done.

+
  protected:
   ImageDecodeTask();
+  explicit ImageDecodeTask(scoped_refptr<ImageDecodeTask> dependency);
   ~ImageDecodeTask() override;
+
+ private:
+  scoped_refptr<ImageDecodeTask> dependency_;
 };
 
 class CC_EXPORT RasterTask : public TileTask {
  public:
   typedef std::vector<scoped_refptr<RasterTask>> Vector;
 
   const ImageDecodeTask::Vector& dependencies() const { return dependencies_; }
 
  protected:
   explicit RasterTask(ImageDecodeTask::Vector* dependencies);
@@ skipping 32 matching lines @@
  protected:
   // Check if resource format matches output format.
   static bool ResourceFormatRequiresSwizzle(ResourceFormat format);
 
   virtual ~TileTaskRunner() {}
 };
 
 }  // namespace cc
 
 #endif  // CC_RASTER_TILE_TASK_RUNNER_H_