gecko/gfx/layers/ipc/CompositorParent.cpp

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 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
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 * 1.1 (the "License"); you may not use this file except in compliance with
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 * The Original Code is Mozilla Content App.
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 * The Initial Developer of the Original Code is
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 * the Initial Developer. All Rights Reserved.
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 * Contributor(s):
 *   Benoit Girard <bgirard@mozilla.com>
 *   Ali Juma <ajuma@mozilla.com>
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#include "CompositorParent.h"
#include "ShadowLayersParent.h"
#include "LayerManagerOGL.h"

namespace mozilla {
namespace layers {

CompositorParent::CompositorParent()
  : mStopped(false)
{

  MOZ_COUNT_CTOR(CompositorParent);
}

CompositorParent::~CompositorParent()
{
  MOZ_COUNT_DTOR(CompositorParent);
}

void
CompositorParent::Destroy()
{
  size_t numChildren = ManagedPLayersParent().Length();
  NS_ABORT_IF_FALSE(0 == numChildren || 1 == numChildren,
                    "compositor must only have 0 or 1 layer manager");

  if (numChildren) {
    ShadowLayersParent* layers =
      static_cast<ShadowLayersParent*>(ManagedPLayersParent()[0]);
    layers->Destroy();
  }
}

bool
CompositorParent::RecvInit()
{
  CancelableTask *composeTask = NewRunnableMethod(this, &CompositorParent::Composite);
  MessageLoop::current()->PostTask(FROM_HERE, composeTask);
  return true;
}

bool
CompositorParent::RecvStop()
{
  mStopped = true;
  Destroy();
  return true;
}

void
CompositorParent::RequestComposition()
{
  CancelableTask *composeTask = NewRunnableMethod(this, &CompositorParent::Composite);
  MessageLoop::current()->PostTask(FROM_HERE, composeTask);
}

void
CompositorParent::Composite()
{
  if (mStopped) {
    return;
  }

  if (!mLayerManager) {
    CancelableTask *composeTask = NewRunnableMethod(this, &CompositorParent::Composite);
    MessageLoop::current()->PostDelayedTask(FROM_HERE, composeTask, 10);
    return;
  }

  mLayerManager->EndEmptyTransaction();
}

PLayersParent*
CompositorParent::AllocPLayers(const LayersBackend &backend, const WidgetDescriptor &widget)
{
  if (widget.type() != WidgetDescriptor::TViewWidget) {
    NS_ERROR("Invalid widget descriptor\n");
    return NULL;
  }

  if (backend == LayerManager::LAYERS_OPENGL) {
    nsIWidget *nsWidget = (nsIWidget*)widget.get_ViewWidget().widgetPtr();
    nsRefPtr<LayerManagerOGL> layerManager = new LayerManagerOGL(nsWidget);

    if (!layerManager->Initialize()) {
      NS_ERROR("Failed to init OGL Layers");
      return NULL;
    }

    ShadowLayerManager* slm = layerManager->AsShadowManager();
    if (!slm) {
      return NULL;
    }

    void *glContext = layerManager->gl()->GetNativeData(mozilla::gl::GLContext::NativeGLContext);
    NativeContext nativeContext = NativeContext((uintptr_t)glContext);
    SendNativeContextCreated(nativeContext);

    mLayerManager = layerManager;

    return new ShadowLayersParent(slm, this);
  } else {
    NS_ERROR("Unsupported backend selected for Async Compositor");
    return NULL;
  }
}

bool
CompositorParent::DeallocPLayers(PLayersParent* actor)
{
  delete actor;
  return true;
}

} // namespace layers
} // namespace mozilla