gecko/gfx/layers/ipc/CompositorParent.cpp

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 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
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 *
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 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Mozilla Content App.
 *
 * The Initial Developer of the Original Code is
 *   The Mozilla Foundation.
 * Portions created by the Initial Developer are Copyright (C) 2011
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Benoit Girard <bgirard@mozilla.com>
 *   Ali Juma <ajuma@mozilla.com>
 *
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 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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#include "CompositorParent.h"
#include "ShadowLayersParent.h"
#include "LayerManagerOGL.h"
#include "nsIWidget.h"
#include "nsGkAtoms.h"

#if defined(MOZ_WIDGET_ANDROID)
#include "AndroidBridge.h"
#include <android/log.h>
#endif

namespace mozilla {
namespace layers {

CompositorParent::CompositorParent(nsIWidget* aWidget)
  : mWidget(aWidget)
  , mCurrentCompositeTask(NULL)
  , mPaused(false)
{
  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()
{
  printf_stderr("Stop composition\n");
  mPaused = true;
  Destroy();
  return true;
}

void
CompositorParent::ScheduleRenderOnCompositorThread(::base::Thread &aCompositorThread)
{
  CancelableTask *renderTask = NewRunnableMethod(this, &CompositorParent::AsyncRender);
  aCompositorThread.message_loop()->PostTask(FROM_HERE, renderTask);
}

void
CompositorParent::PauseComposition()
{
  printf_stderr("Pause composition\n");
  if (!mPaused) {
    mPaused = true;

#ifdef MOZ_WIDGET_ANDROID
    static_cast<LayerManagerOGL*>(mLayerManager.get())->gl()->ReleaseSurface();
#endif
  }
}

void
CompositorParent::ResumeComposition()
{
  mPaused = false;

#ifdef MOZ_WIDGET_ANDROID
  static_cast<LayerManagerOGL*>(mLayerManager.get())->gl()->RenewSurface();
#endif
}

void
CompositorParent::SchedulePauseOnCompositorThread(::base::Thread &aCompositorThread)
{
  CancelableTask *pauseTask = NewRunnableMethod(this,
                                                &CompositorParent::PauseComposition);
  aCompositorThread.message_loop()->PostTask(FROM_HERE, pauseTask);
}

void
CompositorParent::ScheduleResumeOnCompositorThread(::base::Thread &aCompositorThread)
{
  CancelableTask *resumeTask = NewRunnableMethod(this,
                                                 &CompositorParent::ResumeComposition);
  aCompositorThread.message_loop()->PostTask(FROM_HERE, resumeTask);
}

void
CompositorParent::ScheduleComposition()
{
  if (mCurrentCompositeTask) {
    return;
  }

  bool initialComposition = mLastCompose.IsNull();
  TimeDuration delta;
  if (!initialComposition)
    delta = mozilla::TimeStamp::Now() - mLastCompose;

#ifdef COMPOSITOR_PERFORMANCE_WARNING
  mExpectedComposeTime = mozilla::TimeStamp::Now() + TimeDuration::FromMilliseconds(15);
#endif

  printf_stderr("Schedule composition\n");
  mCurrentCompositeTask = NewRunnableMethod(this, &CompositorParent::Composite);
  if (!initialComposition && delta.ToMilliseconds() < 15) {
#ifdef COMPOSITOR_PERFORMANCE_WARNING
    mExpectedComposeTime = mozilla::TimeStamp::Now() + TimeDuration::FromMilliseconds(15 - delta.ToMilliseconds());
#endif
    MessageLoop::current()->PostDelayedTask(FROM_HERE, mCurrentCompositeTask, 15 - delta.ToMilliseconds());
  } else {
    MessageLoop::current()->PostTask(FROM_HERE, mCurrentCompositeTask);
  }
}

void
CompositorParent::SetTransformation(float aScale, nsIntPoint aScrollOffset)
{
  mXScale = aScale;
  mYScale = aScale;
  mScrollOffset = aScrollOffset;
}

void
CompositorParent::Composite()
{
  mCurrentCompositeTask = NULL;

  mLastCompose = mozilla::TimeStamp::Now();

  if (mPaused || !mLayerManager) {
    return;
  }

#ifdef MOZ_RENDERTRACE
  Layer* aLayer = mLayerManager->GetRoot();
  mozilla::layers::RenderTraceLayers(aLayer, "0000");
#endif

#ifdef MOZ_WIDGET_ANDROID
  RequestViewTransform();
  Layer* layer = GetPrimaryScrollableLayer();
  printf_stderr("Correcting for position fixed %i, %i\n", -mScrollOffset.x, -mScrollOffset.y);
  ViewTransform v(mScrollOffset, mXScale, mYScale);
  TransformShadowTree(layer, v);
#endif

  mLayerManager->EndEmptyTransaction();

#ifdef COMPOSITOR_PERFORMANCE_WARNING
  if (mExpectedComposeTime + TimeDuration::FromMilliseconds(15) < mozilla::TimeStamp::Now()) {
    printf_stderr("Compositor: Compose frame took %i time then expected.\n",
                  (int)(mozilla::TimeStamp::Now() - mExpectedComposeTime).ToMilliseconds());
  }
#endif
}

#ifdef MOZ_WIDGET_ANDROID
// Do a breadth-first search to find the first layer in the tree with a
// displayport set.
Layer*
CompositorParent::GetPrimaryScrollableLayer()
{
  Layer* root = mLayerManager->GetRoot();

  nsTArray<Layer*> queue;
  queue.AppendElement(root);
  for (unsigned i = 0; i < queue.Length(); i++) {
    ContainerLayer* containerLayer = queue[i]->AsContainerLayer();
    if (!containerLayer) {
      continue;
    }

    const FrameMetrics& frameMetrics = containerLayer->GetFrameMetrics();
    if (!frameMetrics.mDisplayPort.IsEmpty()) {
      return containerLayer;
    }

    Layer* child = containerLayer->GetFirstChild();
    while (child) {
      queue.AppendElement(child);
      child = child->GetNextSibling();
    }
  }

  return root;
}
#endif

// 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);
  }
}

static double GetXScale(const gfx3DMatrix& aTransform)
{
  return aTransform._11;
}

static double GetYScale(const gfx3DMatrix& aTransform)
{
  return aTransform._22;
}

static void ReverseTranslate(gfx3DMatrix& aTransform, ViewTransform& aViewTransform)
{
  aTransform._41 -= aViewTransform.mTranslation.x / aViewTransform.mXScale;
  aTransform._42 -= aViewTransform.mTranslation.y / aViewTransform.mYScale;
}

void
CompositorParent::TransformShadowTree(Layer* aLayer, const ViewTransform& aTransform,
                    float aTempScaleDiffX, float aTempScaleDiffY)
{
  ShadowLayer* shadow = aLayer->AsShadowLayer();

  gfx3DMatrix shadowTransform = aLayer->GetTransform();
  ViewTransform layerTransform = aTransform;

  ContainerLayer* container = aLayer->AsContainerLayer();

  if (container && container->GetFrameMetrics().IsScrollable()) {
    const FrameMetrics* metrics = &container->GetFrameMetrics();
    const gfx3DMatrix& currentTransform = aLayer->GetTransform();

    aTempScaleDiffX *= GetXScale(mLayerManager->GetRoot()->GetTransform()) * mXScale;
    aTempScaleDiffY *= GetYScale(mLayerManager->GetRoot()->GetTransform()) * mYScale;

    nsIntPoint metricsScrollOffset = metrics->mViewportScrollOffset;

    nsIntPoint scrollCompensation(
        (mScrollOffset.x / aTempScaleDiffX - metricsScrollOffset.x) * mXScale,
        (mScrollOffset.y / aTempScaleDiffY - metricsScrollOffset.y) * mYScale);
    ViewTransform treeTransform(-scrollCompensation, mXScale,
                                mYScale);
    shadowTransform = gfx3DMatrix(treeTransform) * currentTransform;
    layerTransform = treeTransform;
  }

  // Uncomment to deal with position:fixed.
  /*
  if (aLayer->GetIsFixedPosition() &&
      !aLayer->GetParent()->GetIsFixedPosition()) {
    printf_stderr("Correcting for position fixed\n");
    ReverseTranslate(shadowTransform, layerTransform);
    const nsIntRect* clipRect = shadow->GetShadowClipRect();
    if (clipRect) {
      nsIntRect transformedClipRect(*clipRect);
      transformedClipRect.MoveBy(shadowTransform._41, shadowTransform._42);
      shadow->SetShadowClipRect(&transformedClipRect);
    }
  }*/

  shadow->SetShadowTransform(shadowTransform);

  // Uncomment the following when we want to deal with position:fixed.
  // Note that we need to modify other code to ensure that position:fixed
  // things get their own layer. See Bug 607417.
  /*
  for (Layer* child = aLayer->GetFirstChild(); child;
       child = child->GetNextSibling()) {
    TransformShadowTree(child, layerTransform, aTempScaleDiffX,
                       aTempScaleDiffY);
  }*/

}

void
CompositorParent::AsyncRender()
{
  if (mPaused || !mLayerManager) {
    return;
  }

  Layer* root = mLayerManager->GetRoot();
  if (!root) {
    return;
  }

  ScheduleComposition();
}

#ifdef MOZ_WIDGET_ANDROID
void
CompositorParent::RequestViewTransform()
{
  mozilla::AndroidBridge::Bridge()->GetViewTransform(mScrollOffset, mXScale, mYScale);

  __android_log_print(ANDROID_LOG_ERROR, "Gecko", "### mScrollOffset=%g %g "
                      "mXScale=%g mYScale=%g", (float)mScrollOffset.x, (float)mScrollOffset.y,
                      (float)mXScale, (float)mYScale);
}
#endif

void
CompositorParent::ShadowLayersUpdated()
{
  printf_stderr("ShadowLayersUpdated\n");
  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