gecko-dev/gfx/layers/ipc/CompositorParent.cpp

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 * The Original Code is Mozilla Content App.
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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"
#include "nsIWidget.h"

namespace mozilla {
namespace layers {

CompositorParent::CompositorParent(nsIWidget* aWidget)
  : mStopped(false), mWidget(aWidget)
{
  MOZ_COUNT_CTOR(CompositorParent);
}

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

void
CompositorParent::Destroy()
{
  NS_ABORT_IF_FALSE(ManagedPLayersParent().Length() == 0,
                    "CompositorParent destroyed before managed PLayersParent");

  // Ensure that the layer manager is destroyed on the compositor thread.
  mLayerManager = NULL;
}

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

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

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

  mLayerManager->EndEmptyTransaction();
}

// Go down shadow layer tree, setting properties to match their non-shadow
// counterparts.
static void
SetShadowProperties(Layer* aLayer)
{
  // FIXME: Bug 717688 -- Do these updates in ShadowLayersParent::RecvUpdate.
  ShadowLayer* shadow = aLayer->AsShadowLayer();
  shadow->SetShadowTransform(aLayer->GetTransform());
  shadow->SetShadowVisibleRegion(aLayer->GetVisibleRegion());
  shadow->SetShadowClipRect(aLayer->GetClipRect());

  for (Layer* child = aLayer->GetFirstChild();
      child; child = child->GetNextSibling()) {
    SetShadowProperties(child);
  }
}

void
CompositorParent::ShadowLayersUpdated()
{
  const nsTArray<PLayersParent*>& shadowParents = ManagedPLayersParent();
  NS_ABORT_IF_FALSE(shadowParents.Length() <= 1,
                    "can only support at most 1 ShadowLayersParent");
  if (shadowParents.Length()) {
    Layer* root = static_cast<ShadowLayersParent*>(shadowParents[0])->GetRoot();
    mLayerManager->SetRoot(root);
    SetShadowProperties(root);
  }
  ScheduleComposition();
}

PLayersParent*
CompositorParent::AllocPLayers(const LayersBackend &backendType)
{
  if (backendType == LayerManager::LAYERS_OPENGL) {
    nsRefPtr<LayerManagerOGL> layerManager = new LayerManagerOGL(mWidget);
    mWidget = NULL;
    mLayerManager = layerManager;

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

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