cc: Refactor TileTaskWorkerPool.

cc/raster/tile_task_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_RASTER_TILE_TASK_WORKER_POOL_H_
-#define CC_RASTER_TILE_TASK_WORKER_POOL_H_
-
-#include <stddef.h>
-
-#include "cc/playback/raster_source.h"
-#include "cc/raster/raster_buffer.h"
-#include "cc/raster/task_graph_runner.h"
-#include "cc/raster/tile_task.h"
-#include "cc/resources/resource_format.h"
-#include "ui/gfx/geometry/rect.h"
-#include "ui/gfx/geometry/size.h"
-
-namespace base {
-class SequencedTaskRunner;
-}
-
-namespace cc {
-class RenderingStatsInstrumentation;
-
-// This class provides the wrapper over TaskGraphRunner for scheduling and
-// collecting tasks. The client can call CheckForCompletedTasks() at any time to
-// process all completed tasks at the moment that have finished running or
-// cancelled.
-class CC_EXPORT TileTaskWorkerPool {
- public:
-  TileTaskWorkerPool();
-  virtual ~TileTaskWorkerPool();
-
-  // Utility function that can be used to call ::ScheduleOnOriginThread() for
-  // each task in |graph|.
-  static void ScheduleTasksOnOriginThread(RasterBufferProvider* provider,
-                                          TaskGraph* graph);
-
-  // Utility function that will create a temporary bitmap and copy pixels to
-  // |memory| when necessary. The |canvas_bitmap_rect| is the rect of the bitmap
-  // being played back in the pixel space of the source, ie a rect in the source
-  // that will cover the resulting |memory|. The |canvas_playback_rect| can be a
-  // smaller contained rect inside the |canvas_bitmap_rect| if the |memory| is
-  // already partially complete, and only the subrect needs to be played back.
-  static void PlaybackToMemory(
-      void* memory,
-      ResourceFormat format,
-      const gfx::Size& size,
-      size_t stride,
-      const RasterSource* raster_source,
-      const gfx::Rect& canvas_bitmap_rect,
-      const gfx::Rect& canvas_playback_rect,
-      float scale,
-      const RasterSource::PlaybackSettings& playback_settings);
-
-  // Tells the worker pool to shutdown after canceling all previously scheduled
-  // tasks. Reply callbacks are still guaranteed to run when
-  // CheckForCompletedTasks() is called.
-  virtual void Shutdown() = 0;
-
-  // Schedule running of tile tasks in |graph| and all dependencies.
-  // Previously scheduled tasks that are not in |graph| will be canceled unless
-  // already running. 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(TaskGraph* graph) = 0;
-
-  // Check for completed tasks and dispatch reply callbacks.
-  virtual void CheckForCompletedTasks() = 0;
-
-  // Returns the format to use for the tiles.
-  virtual ResourceFormat GetResourceFormat(bool must_support_alpha) const = 0;
-
-  // Determine if the resource requires swizzling.
-  virtual bool GetResourceRequiresSwizzle(bool must_support_alpha) const = 0;
-
-  // Downcasting routine for RasterBufferProvider interface.
-  virtual RasterBufferProvider* AsRasterBufferProvider() = 0;
-
- protected:
-  // Check if resource format matches output format.
-  static bool ResourceFormatRequiresSwizzle(ResourceFormat format);
-};
-
-}  // namespace cc
-
-#endif  // CC_RASTER_TILE_TASK_WORKER_POOL_H_