gfx/layers/ipc/CompositorParent.h
author Phil Ringnalda <philringnalda@gmail.com>
Sun, 08 Dec 2013 18:43:45 -0800
changeset 174184 45193a6d79940ecb744556386d47aa8a7fbc37f1
parent 174182 498152aec5b1eadb68ad76e9d9b9f95cef5e97f5
child 175653 96fd6d7d2f8c38379ebd964fbd9c35f076a3909f
permissions -rw-r--r--
Backed out 7 changesets (bug 946958, bug 865033) Backed out changeset 6dd0a6cb9ab3 (bug 946958) Backed out changeset 498152aec5b1 (bug 946958) Backed out changeset 7d035322f51d (bug 946958) Backed out changeset 99f8ad7561ef (bug 946958) Backed out changeset 4639c5abea80 (bug 946958) Backed out changeset 9d1a4d83eccf (bug 865033) Backed out changeset 41839e4026bc (bug 865033)

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set sw=4 ts=8 et tw=80 : */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef mozilla_layers_CompositorParent_h
#define mozilla_layers_CompositorParent_h

// Enable this pref to turn on compositor performance warning.
// This will print warnings if the compositor isn't meeting
// its responsiveness objectives:
//    1) Compose a frame within 15ms of receiving a ScheduleCompositeCall
//    2) Unless a frame was composited within the throttle threshold in
//       which the deadline will be 15ms + throttle threshold
//#define COMPOSITOR_PERFORMANCE_WARNING

#include <stdint.h>                     // for uint64_t
#include "Layers.h"                     // for Layer
#include "ShadowLayersManager.h"        // for ShadowLayersManager
#include "base/basictypes.h"            // for DISALLOW_EVIL_CONSTRUCTORS
#include "base/platform_thread.h"       // for PlatformThreadId
#include "mozilla/Assertions.h"         // for MOZ_ASSERT_HELPER2
#include "mozilla/Attributes.h"         // for MOZ_OVERRIDE
#include "mozilla/Monitor.h"            // for Monitor
#include "mozilla/RefPtr.h"             // for RefPtr
#include "mozilla/TimeStamp.h"          // for TimeStamp
#include "mozilla/ipc/ProtocolUtils.h"
#include "mozilla/layers/GeckoContentController.h"
#include "mozilla/layers/LayersMessages.h"  // for TargetConfig
#include "mozilla/layers/PCompositorParent.h"
#include "nsAutoPtr.h"                  // for nsRefPtr
#include "nsISupportsImpl.h"
#include "nsSize.h"                     // for nsIntSize

class CancelableTask;
class MessageLoop;
class gfxContext;
class nsIWidget;

namespace mozilla {
namespace gfx {
class DrawTarget;
}

namespace layers {

class APZCTreeManager;
class AsyncCompositionManager;
class LayerManagerComposite;
class LayerTransactionParent;

struct ScopedLayerTreeRegistration
{
  ScopedLayerTreeRegistration(uint64_t aLayersId,
                              Layer* aRoot,
                              GeckoContentController* aController);
  ~ScopedLayerTreeRegistration();

private:
  uint64_t mLayersId;
};

class CompositorParent : public PCompositorParent,
                         public ShadowLayersManager
{
  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(CompositorParent)

public:
  CompositorParent(nsIWidget* aWidget,
                   bool aUseExternalSurfaceSize = false,
                   int aSurfaceWidth = -1, int aSurfaceHeight = -1);

  virtual ~CompositorParent();

  // IToplevelProtocol::CloneToplevel()
  virtual IToplevelProtocol*
  CloneToplevel(const InfallibleTArray<mozilla::ipc::ProtocolFdMapping>& aFds,
                base::ProcessHandle aPeerProcess,
                mozilla::ipc::ProtocolCloneContext* aCtx) MOZ_OVERRIDE;

  virtual bool RecvWillStop() MOZ_OVERRIDE;
  virtual bool RecvStop() MOZ_OVERRIDE;
  virtual bool RecvPause() MOZ_OVERRIDE;
  virtual bool RecvResume() MOZ_OVERRIDE;
  virtual bool RecvNotifyChildCreated(const uint64_t& child) MOZ_OVERRIDE;
  virtual bool RecvMakeSnapshot(const SurfaceDescriptor& aInSnapshot,
                                SurfaceDescriptor* aOutSnapshot);
  virtual bool RecvFlushRendering() MOZ_OVERRIDE;

  virtual bool RecvNotifyRegionInvalidated(const nsIntRegion& aRegion) MOZ_OVERRIDE;
  virtual bool RecvStartFrameTimeRecording(const int32_t& aBufferSize, uint32_t* aOutStartIndex) MOZ_OVERRIDE;
  virtual bool RecvStopFrameTimeRecording(const uint32_t& aStartIndex, InfallibleTArray<float>* intervals) MOZ_OVERRIDE;

  virtual void ActorDestroy(ActorDestroyReason why) MOZ_OVERRIDE;

  virtual void ShadowLayersUpdated(LayerTransactionParent* aLayerTree,
                                   const TargetConfig& aTargetConfig,
                                   bool isFirstPaint) MOZ_OVERRIDE;
  /**
   * This forces the is-first-paint flag to true. This is intended to
   * be called by the widget code when it loses its viewport information
   * (or for whatever reason wants to refresh the viewport information).
   * The information refresh happens because the compositor will call
   * SetFirstPaintViewport on the next frame of composition.
   */
  void ForceIsFirstPaint();
  void Destroy();

  LayerManagerComposite* GetLayerManager() { return mLayerManager; }

  void NotifyChildCreated(uint64_t aChild);

  void AsyncRender();

  // Can be called from any thread
  void ScheduleRenderOnCompositorThread();
  void SchedulePauseOnCompositorThread();
  /**
   * Returns true if a surface was obtained and the resume succeeded; false
   * otherwise.
   */
  bool ScheduleResumeOnCompositorThread(int width, int height);

  virtual void ScheduleComposition();
  void NotifyShadowTreeTransaction(uint64_t aId, bool aIsFirstPaint);

  /**
   * Returns the unique layer tree identifier that corresponds to the root
   * tree of this compositor.
   */
  uint64_t RootLayerTreeId();

  /**
   * Returns a pointer to the compositor corresponding to the given ID.
   */
  static CompositorParent* GetCompositor(uint64_t id);

  /**
   * Returns the compositor thread's message loop.
   *
   * This message loop is used by CompositorParent and ImageBridgeParent.
   */
  static MessageLoop* CompositorLoop();

  /**
   * Creates the compositor thread and the global compositor map.
   */
  static void StartUp();

  /**
   * Destroys the compositor thread and the global compositor map.
   */
  static void ShutDown();

  /**
   * Allocate an ID that can be used to refer to a layer tree and
   * associated resources that live only on the compositor thread.
   *
   * Must run on the content main thread.
   */
  static uint64_t AllocateLayerTreeId();
  /**
   * Release compositor-thread resources referred to by |aID|.
   *
   * Must run on the content main thread.
   */
  static void DeallocateLayerTreeId(uint64_t aId);

  /**
   * Set aController as the pan/zoom callback for the subtree referred
   * to by aLayersId.
   *
   * Must run on content main thread.
   */
  static void SetControllerForLayerTree(uint64_t aLayersId,
                                        GeckoContentController* aController);

  /**
   * This returns a reference to the APZCTreeManager to which
   * pan/zoom-related events can be sent.
   */
  static APZCTreeManager* GetAPZCTreeManager(uint64_t aLayersId);

  /**
   * A new child process has been configured to push transactions
   * directly to us.  Transport is to its thread context.
   */
  static PCompositorParent*
  Create(Transport* aTransport, ProcessId aOtherProcess);

  /**
   * Setup external message loop and thread ID for Compositor.
   * Should be used when CompositorParent should work in existing thread/MessageLoop,
   * for example moving Compositor into native toolkit main thread will allow to avoid
   * extra synchronization and call ::Composite() right from toolkit::Paint event
   */
  static void StartUpWithExistingThread(MessageLoop* aMsgLoop,
                                        PlatformThreadId aThreadID);

  struct LayerTreeState {
    LayerTreeState();
    nsRefPtr<Layer> mRoot;
    nsRefPtr<GeckoContentController> mController;
    CompositorParent* mParent;
    TargetConfig mTargetConfig;
  };

  /**
   * Lookup the indirect shadow tree for |aId| and return it if it
   * exists.  Otherwise null is returned.  This must only be called on
   * the compositor thread.
   */
  static const LayerTreeState* GetIndirectShadowTree(uint64_t aId);

  /**
   * Tell all CompositorParents to update their last refresh to aTime and sample
   * animations at this time stamp.  If aIsTesting is true, the
   * CompositorParents will become "paused" and continue sampling animations at
   * this time stamp until this function is called again with aIsTesting set to
   * false.
   */
  static void SetTimeAndSampleAnimations(TimeStamp aTime, bool aIsTesting);

  /**
   * Returns true if the calling thread is the compositor thread.
   */
  static bool IsInCompositorThread();
protected:
  virtual PLayerTransactionParent*
    AllocPLayerTransactionParent(const nsTArray<LayersBackend>& aBackendHints,
                                 const uint64_t& aId,
                                 TextureFactoryIdentifier* aTextureFactoryIdentifier,
                                 bool* aSuccess);
  virtual bool DeallocPLayerTransactionParent(PLayerTransactionParent* aLayers);
  virtual void ScheduleTask(CancelableTask*, int);
  void Composite();
  void CompositeInTransaction();
  virtual void ComposeToTarget(gfx::DrawTarget* aTarget);

  void SetEGLSurfaceSize(int width, int height);

private:
  void InitializeLayerManager(const nsTArray<LayersBackend>& aBackendHints);
  void PauseComposition();
  void ResumeComposition();
  void ResumeCompositionAndResize(int width, int height);
  void ForceComposition();

  inline static PlatformThreadId CompositorThreadID();

  /**
   * Creates a global map referencing each compositor by ID.
   *
   * This map is used by the ImageBridge protocol to trigger
   * compositions without having to keep references to the
   * compositor
   */
  static void CreateCompositorMap();
  static void DestroyCompositorMap();

  /**
   * Creates the compositor thread.
   *
   * All compositors live on the same thread.
   * The thread is not lazily created on first access to avoid dealing with
   * thread safety. Therefore it's best to create and destroy the thread when
   * we know we areb't using it (So creating/destroying along with gfxPlatform
   * looks like a good place).
   */
  static bool CreateThread();

  /**
   * Destroys the compositor thread.
   *
   * It is safe to call this fucntion more than once, although the second call
   * will have no effect.
   * This function is not thread-safe.
   */
  static void DestroyThread();

  /**
   * Add a compositor to the global compositor map.
   */
  static void AddCompositor(CompositorParent* compositor, uint64_t* id);
  /**
   * Remove a compositor from the global compositor map.
   */
  static CompositorParent* RemoveCompositor(uint64_t id);

   /**
   * Return true if current state allows compositing, that is
   * finishing a layers transaction.
   */
  bool CanComposite();

  nsRefPtr<LayerManagerComposite> mLayerManager;
  RefPtr<AsyncCompositionManager> mCompositionManager;
  nsIWidget* mWidget;
  CancelableTask *mCurrentCompositeTask;
  TimeStamp mLastCompose;
  TimeStamp mTestTime;
  bool mIsTesting;
#ifdef COMPOSITOR_PERFORMANCE_WARNING
  TimeStamp mExpectedComposeTime;
#endif

  bool mPaused;

  bool mUseExternalSurfaceSize;
  nsIntSize mEGLSurfaceSize;

  mozilla::Monitor mPauseCompositionMonitor;
  mozilla::Monitor mResumeCompositionMonitor;

  uint64_t mCompositorID;
  uint64_t mRootLayerTreeID;

  bool mOverrideComposeReadiness;
  CancelableTask* mForceCompositionTask;

  nsRefPtr<APZCTreeManager> mApzcTreeManager;

  DISALLOW_EVIL_CONSTRUCTORS(CompositorParent);
};

} // layers
} // mozilla

#endif // mozilla_layers_CompositorParent_h