gfx/layers/ipc/CompositorParent.h
author Patrick Walton <pwalton@mozilla.com>
Fri, 03 Feb 2012 18:35:58 -0800
changeset 89080 72ee03c1e571ed3e4fb5795a2aa16c7e800dc9f3
parent 89079 afa846fcbd500b20dcb6e6ef6cf366e65e6f482f
child 89082 d678113069ca2b8d5b9e96596576cc4526d6a049
permissions -rw-r--r--
Poke the compositor to composite on a pan or zoom; stub AndroidBridge::GetViewTransform()

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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 *   Benoit Girard <bgirard@mozilla.com>
 *   Ali Juma <ajuma@mozilla.com>
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#ifndef mozilla_layers_CompositorParent_h
#define mozilla_layers_CompositorParent_h

#include "mozilla/layers/PCompositorParent.h"
#include "mozilla/layers/PLayersParent.h"
#include "base/thread.h"
#include "ShadowLayersManager.h"

class nsIWidget;

namespace mozilla {
namespace layers {

class LayerManager;

// Represents (affine) transforms that are calculated from a content view.
struct ViewTransform {
  ViewTransform(nsIntPoint aTranslation = nsIntPoint(0, 0), float aXScale = 1, float aYScale = 1)
    : mTranslation(aTranslation)
    , mXScale(aXScale)
    , mYScale(aYScale)
  {}

  operator gfx3DMatrix() const
  {
    return
      gfx3DMatrix::ScalingMatrix(mXScale, mYScale, 1) *
      gfx3DMatrix::Translation(mTranslation.x, mTranslation.y, 0);
  }

  nsIntPoint mTranslation;
  float mXScale;
  float mYScale;
};

class CompositorParent : public PCompositorParent,
                         public ShadowLayersManager
{
  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(CompositorParent)
public:
  CompositorParent(nsIWidget* aWidget);
  virtual ~CompositorParent();

  virtual bool RecvStop() MOZ_OVERRIDE;

  virtual void ShadowLayersUpdated() MOZ_OVERRIDE;
  void Destroy();

  LayerManager* GetLayerManager() { return mLayerManager; }

  void SetTransformation(float aScale, nsIntPoint aScrollOffset);
  void AsyncRender();
  void ScheduleCompositionOnCompositorThread(::base::Thread &aCompositorThread);

protected:
  virtual PLayersParent* AllocPLayers(const LayersBackend &backendType);
  virtual bool DeallocPLayers(PLayersParent* aLayers);

private:
  void ScheduleComposition();
  void Composite();
#ifdef OMTC_TEST_ASYNC_SCROLLING
  void TestScroll();
#endif
  void TransformShadowTree(Layer* aLayer, const ViewTransform& aTransform,
                           float aTempScaleDiffX = 1.0,
                           float aTempScaleDiffY = 1.0);

  // Platform specific functions
#ifdef MOZ_WIDGET_ANDROID
  /**
   * Register the compositor thread with the Java native thread.
   * This will replace the temporary compositor with the real
   * Gecko compositor thread.
   **/
  void RegisterCompositorWithJava();

  /**
   * Asks Java for the viewport position and updates the world transform
   * accordingly.
   */
  void RequestViewTransform();
#endif

  nsRefPtr<LayerManager> mLayerManager;
  bool mStopped;
  nsIWidget* mWidget;
  float mXScale;
  float mYScale;
  nsIntPoint mScrollOffset;

  DISALLOW_EVIL_CONSTRUCTORS(CompositorParent);
};

} // layers
} // mozilla

#endif // mozilla_layers_CompositorParent_h