Delete CC.

cc/scheduler/scheduler_state_machine.h

Index: cc/scheduler/scheduler_state_machine.h
diff --git a/cc/scheduler/scheduler_state_machine.h b/cc/scheduler/scheduler_state_machine.h
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index c5121d964727fa0226b6986f5462311eca2844eb..0000000000000000000000000000000000000000
--- a/cc/scheduler/scheduler_state_machine.h
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-// Copyright 2011 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_SCHEDULER_SCHEDULER_STATE_MACHINE_H_
-#define CC_SCHEDULER_SCHEDULER_STATE_MACHINE_H_
-
-#include <string>
-
-#include "base/basictypes.h"
-#include "base/memory/scoped_ptr.h"
-#include "cc/output/begin_frame_args.h"
-#include "cc/scheduler/commit_earlyout_reason.h"
-#include "cc/scheduler/draw_result.h"
-#include "cc/scheduler/scheduler_settings.h"
-
-namespace base {
-namespace trace_event {
-class ConvertableToTraceFormat;
-class TracedValue;
-}
-class Value;
-}
-
-namespace cc {
-
-// The SchedulerStateMachine decides how to coordinate main thread activites
-// like painting/running javascript with rendering and input activities on the
-// impl thread.
-//
-// The state machine tracks internal state but is also influenced by external
-// state.  Internal state includes things like whether a frame has been
-// requested, while external state includes things like the current time being
-// near to the vblank time.
-//
-// The scheduler seperates "what to do next" from the updating of its internal
-// state to make testing cleaner.
-class SchedulerStateMachine {
- public:
-  // settings must be valid for the lifetime of this class.
-  explicit SchedulerStateMachine(const SchedulerSettings& settings);
-
-  enum OutputSurfaceState {
-    OUTPUT_SURFACE_ACTIVE,
-    OUTPUT_SURFACE_LOST,
-    OUTPUT_SURFACE_CREATING,
-    OUTPUT_SURFACE_WAITING_FOR_FIRST_COMMIT,
-    OUTPUT_SURFACE_WAITING_FOR_FIRST_ACTIVATION,
-  };
-  static const char* OutputSurfaceStateToString(OutputSurfaceState state);
-
-  // Note: BeginImplFrameState will always cycle through all the states in
-  // order. Whether or not it actually waits or draws, it will at least try to
-  // wait in BEGIN_IMPL_FRAME_STATE_INSIDE_BEGIN_FRAME and try to draw in
-  // BEGIN_IMPL_FRAME_STATE_INSIDE_DEADLINE
-  enum BeginImplFrameState {
-    BEGIN_IMPL_FRAME_STATE_IDLE,
-    BEGIN_IMPL_FRAME_STATE_BEGIN_FRAME_STARTING,
-    BEGIN_IMPL_FRAME_STATE_INSIDE_BEGIN_FRAME,
-    BEGIN_IMPL_FRAME_STATE_INSIDE_DEADLINE,
-  };
-  static const char* BeginImplFrameStateToString(BeginImplFrameState state);
-
-  enum BeginImplFrameDeadlineMode {
-    BEGIN_IMPL_FRAME_DEADLINE_MODE_IMMEDIATE,
-    BEGIN_IMPL_FRAME_DEADLINE_MODE_REGULAR,
-    BEGIN_IMPL_FRAME_DEADLINE_MODE_LATE,
-  };
-  static const char* BeginImplFrameDeadlineModeToString(
-      BeginImplFrameDeadlineMode mode);
-
-  enum CommitState {
-    COMMIT_STATE_IDLE,
-    COMMIT_STATE_BEGIN_MAIN_FRAME_SENT,
-    COMMIT_STATE_BEGIN_MAIN_FRAME_STARTED,
-    COMMIT_STATE_READY_TO_COMMIT,
-    COMMIT_STATE_WAITING_FOR_ACTIVATION,
-    COMMIT_STATE_WAITING_FOR_DRAW,
-  };
-  static const char* CommitStateToString(CommitState state);
-
-  enum ForcedRedrawOnTimeoutState {
-    FORCED_REDRAW_STATE_IDLE,
-    FORCED_REDRAW_STATE_WAITING_FOR_COMMIT,
-    FORCED_REDRAW_STATE_WAITING_FOR_ACTIVATION,
-    FORCED_REDRAW_STATE_WAITING_FOR_DRAW,
-  };
-  static const char* ForcedRedrawOnTimeoutStateToString(
-      ForcedRedrawOnTimeoutState state);
-
-  bool CommitPending() const {
-    return commit_state_ == COMMIT_STATE_BEGIN_MAIN_FRAME_SENT ||
-           commit_state_ == COMMIT_STATE_BEGIN_MAIN_FRAME_STARTED ||
-           commit_state_ == COMMIT_STATE_READY_TO_COMMIT;
-  }
-  CommitState commit_state() const { return commit_state_; }
-
-  bool RedrawPending() const { return needs_redraw_; }
-  bool PrepareTilesPending() const { return needs_prepare_tiles_; }
-
-  enum Action {
-    ACTION_NONE,
-    ACTION_ANIMATE,
-    ACTION_SEND_BEGIN_MAIN_FRAME,
-    ACTION_COMMIT,
-    ACTION_ACTIVATE_SYNC_TREE,
-    ACTION_DRAW_AND_SWAP_IF_POSSIBLE,
-    ACTION_DRAW_AND_SWAP_FORCED,
-    ACTION_DRAW_AND_SWAP_ABORT,
-    ACTION_BEGIN_OUTPUT_SURFACE_CREATION,
-    ACTION_PREPARE_TILES,
-  };
-  static const char* ActionToString(Action action);
-
-  scoped_refptr<base::trace_event::ConvertableToTraceFormat> AsValue() const;
-  void AsValueInto(base::trace_event::TracedValue* dict) const;
-
-  Action NextAction() const;
-  void UpdateState(Action action);
-
-  // Indicates whether the impl thread needs a BeginImplFrame callback in order
-  // to make progress.
-  bool BeginFrameNeeded() const;
-
-  // Indicates that we need to independently poll for new state and actions
-  // because we can't expect a BeginImplFrame. This is mostly used to avoid
-  // drawing repeat frames with the synchronous compositor without dropping
-  // necessary actions on the floor.
-  bool ShouldPollForAnticipatedDrawTriggers() const;
-
-  // Indicates that the system has entered and left a BeginImplFrame callback.
-  // The scheduler will not draw more than once in a given BeginImplFrame
-  // callback nor send more than one BeginMainFrame message.
-  void OnBeginImplFrame();
-  void OnBeginImplFrameDeadlinePending();
-  void OnBeginImplFrameDeadline();
-  void OnBeginImplFrameIdle();
-  BeginImplFrameState begin_impl_frame_state() const {
-    return begin_impl_frame_state_;
-  }
-  BeginImplFrameDeadlineMode CurrentBeginImplFrameDeadlineMode() const;
-
-  // If the main thread didn't manage to produce a new frame in time for the
-  // impl thread to draw, it is in a high latency mode.
-  bool MainThreadIsInHighLatencyMode() const;
-
-  // PollForAnticipatedDrawTriggers is used by the synchronous compositor to
-  // avoid requesting BeginImplFrames when we won't actually draw but still
-  // need to advance our state at vsync intervals.
-  void DidEnterPollForAnticipatedDrawTriggers();
-  void DidLeavePollForAnticipatedDrawTriggers();
-  bool inside_poll_for_anticipated_draw_triggers() const {
-    return inside_poll_for_anticipated_draw_triggers_;
-  }
-
-  // Indicates whether the LayerTreeHostImpl is visible.
-  void SetVisible(bool visible);
-  bool visible() const { return visible_; }
-
-  // Indicates that a redraw is required, either due to the impl tree changing
-  // or the screen being damaged and simply needing redisplay.
-  void SetNeedsRedraw();
-  bool needs_redraw() const { return needs_redraw_; }
-
-  void SetNeedsAnimate();
-  bool needs_animate() const { return needs_animate_; }
-
-  // Indicates that prepare-tiles is required. This guarantees another
-  // PrepareTiles will occur shortly (even if no redraw is required).
-  void SetNeedsPrepareTiles();
-
-  // Sets how many swaps can be pending to the OutputSurface.
-  void SetMaxSwapsPending(int max);
-
-  // If the scheduler attempted to draw and swap, this provides feedback
-  // regarding whether or not the swap actually occured. We might skip the
-  // swap when there is not damage, for example.
-  void DidSwapBuffers();
-
-  // Indicates whether a redraw is required because we are currently rendering
-  // with a low resolution or checkerboarded tile.
-  void SetSwapUsedIncompleteTile(bool used_incomplete_tile);
-
-  // Notification from the OutputSurface that a swap has been consumed.
-  void DidSwapBuffersComplete();
-
-  // Indicates whether to prioritize impl thread latency (i.e., animation
-  // smoothness) over new content activation.
-  void SetImplLatencyTakesPriority(bool impl_latency_takes_priority);
-  bool impl_latency_takes_priority() const {
-    return impl_latency_takes_priority_;
-  }
-
-  // Indicates whether ACTION_DRAW_AND_SWAP_IF_POSSIBLE drew to the screen.
-  void DidDrawIfPossibleCompleted(DrawResult result);
-
-  // Indicates that a new commit flow needs to be performed, either to pull
-  // updates from the main thread to the impl, or to push deltas from the impl
-  // thread to main.
-  void SetNeedsCommit();
-
-  // Call this only in response to receiving an ACTION_SEND_BEGIN_MAIN_FRAME
-  // from NextAction.
-  // Indicates that all painting is complete.
-  void NotifyReadyToCommit();
-
-  // Call this only in response to receiving an ACTION_SEND_BEGIN_MAIN_FRAME
-  // from NextAction if the client rejects the BeginMainFrame message.
-  void BeginMainFrameAborted(CommitEarlyOutReason reason);
-
-  // Set that we can create the first OutputSurface and start the scheduler.
-  void SetCanStart() { can_start_ = true; }
-  // Allow access of the can_start_ state in tests.
-  bool CanStartForTesting() const { return can_start_; }
-
-  void SetSkipNextBeginMainFrameToReduceLatency();
-
-  // Indicates whether drawing would, at this time, make sense.
-  // CanDraw can be used to suppress flashes or checkerboarding
-  // when such behavior would be undesirable.
-  void SetCanDraw(bool can);
-
-  // Indicates that scheduled BeginMainFrame is started.
-  void NotifyBeginMainFrameStarted();
-
-  // Indicates that the pending tree is ready for activation.
-  void NotifyReadyToActivate();
-
-  bool has_pending_tree() const { return has_pending_tree_; }
-  bool active_tree_needs_first_draw() const {
-    return active_tree_needs_first_draw_;
-  }
-
-  void DidPrepareTiles();
-  void DidLoseOutputSurface();
-  void DidCreateAndInitializeOutputSurface();
-  bool HasInitializedOutputSurface() const;
-
-  // True if we need to abort draws to make forward progress.
-  bool PendingDrawsShouldBeAborted() const;
-
-  bool SupportsProactiveBeginFrame() const;
-
-  void SetContinuousPainting(bool continuous_painting) {
-    continuous_painting_ = continuous_painting;
-  }
-
-  bool CouldSendBeginMainFrame() const;
-
-  void SetDeferCommits(bool defer_commits);
-
-  // TODO(zmo): This is temporary for debugging crbug.com/393331.
-  // We should remove it afterwards.
-  std::string GetStatesForDebugging() const;
-
-  void SetChildrenNeedBeginFrames(bool children_need_begin_frames);
-  bool children_need_begin_frames() const {
-    return children_need_begin_frames_;
-  }
-
- protected:
-  bool BeginFrameNeededToAnimateOrDraw() const;
-  bool BeginFrameNeededForChildren() const;
-  bool ProactiveBeginFrameWanted() const;
-
-  bool ShouldTriggerBeginImplFrameDeadlineImmediately() const;
-
-  // True if we need to force activations to make forward progress.
-  bool PendingActivationsShouldBeForced() const;
-
-  bool ShouldAnimate() const;
-  bool ShouldBeginOutputSurfaceCreation() const;
-  bool ShouldDraw() const;
-  bool ShouldActivatePendingTree() const;
-  bool ShouldSendBeginMainFrame() const;
-  bool ShouldCommit() const;
-  bool ShouldPrepareTiles() const;
-
-  void AdvanceCurrentFrameNumber();
-
-  void UpdateStateOnCommit(bool commit_had_no_updates);
-  void UpdateStateOnActivation();
-  void UpdateStateOnDraw(bool did_request_swap);
-  void UpdateStateOnPrepareTiles();
-
-  const SchedulerSettings settings_;
-
-  OutputSurfaceState output_surface_state_;
-  BeginImplFrameState begin_impl_frame_state_;
-  CommitState commit_state_;
-  ForcedRedrawOnTimeoutState forced_redraw_state_;
-
-  // These are used for tracing only.
-  int commit_count_;
-  int current_frame_number_;
-  int last_frame_number_animate_performed_;
-  int last_frame_number_swap_performed_;
-  int last_frame_number_swap_requested_;
-  int last_frame_number_begin_main_frame_sent_;
-
-  // These are used to ensure that an action only happens once per frame,
-  // deadline, etc.
-  bool animate_funnel_;
-  bool perform_swap_funnel_;
-  bool request_swap_funnel_;
-  bool send_begin_main_frame_funnel_;
-  // prepare_tiles_funnel_ is "filled" each time PrepareTiles is called
-  // and "drained" on each BeginImplFrame. If the funnel gets too full,
-  // we start throttling ACTION_PREPARE_TILES such that we average one
-  // PrepareTiles per BeginImplFrame.
-  int prepare_tiles_funnel_;
-
-  int consecutive_checkerboard_animations_;
-  int max_pending_swaps_;
-  int pending_swaps_;
-  bool needs_redraw_;
-  bool needs_animate_;
-  bool needs_prepare_tiles_;
-  bool needs_commit_;
-  bool inside_poll_for_anticipated_draw_triggers_;
-  bool visible_;
-  bool can_start_;
-  bool can_draw_;
-  bool has_pending_tree_;
-  bool pending_tree_is_ready_for_activation_;
-  bool active_tree_needs_first_draw_;
-  bool did_create_and_initialize_first_output_surface_;
-  bool impl_latency_takes_priority_;
-  bool skip_next_begin_main_frame_to_reduce_latency_;
-  bool skip_begin_main_frame_to_reduce_latency_;
-  bool continuous_painting_;
-  bool children_need_begin_frames_;
-  bool defer_commits_;
-  bool last_commit_had_no_updates_;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(SchedulerStateMachine);
-};
-
-}  // namespace cc
-
-#endif  // CC_SCHEDULER_SCHEDULER_STATE_MACHINE_H_