image/Image.cpp
author Ryan VanderMeulen <ryanvm@gmail.com>
Wed, 17 Jan 2018 15:55:38 -0500
changeset 399709 ef04f3ad847540c876c130b7d140a960d922a024
parent 396246 4e2cf0afd644cc0f2dfb0f6def3f1c1d25a19d27
child 410325 420e6f921109b3568c1d7bac4ea7aefb94a85c26
permissions -rw-r--r--
Backed out 20 changesets (bug 1411654) for incorrect android:debuggable. r=nalexander, a=RyanVM Backed out changeset cfad693be918 (bug 1411654) Backed out changeset 55776829a744 (bug 1411654) Backed out changeset c5bf85d56fed (bug 1411654) Backed out changeset c270f97bb0da (bug 1411654) Backed out changeset fde9bf9c14c3 (bug 1411654) Backed out changeset 01836fd98c63 (bug 1411654) Backed out changeset 730a70767743 (bug 1411654) Backed out changeset 690e265c684c (bug 1411654) Backed out changeset f918500d9cf5 (bug 1411654) Backed out changeset cec2b8828cc8 (bug 1411654) Backed out changeset 76085ddd5ac7 (bug 1411654) Backed out changeset 2b37201606f5 (bug 1411654) Backed out changeset d0d513d1c379 (bug 1411654) Backed out changeset e7b0cc801cf1 (bug 1411654) Backed out changeset 901b304603d9 (bug 1411654) Backed out changeset 373c9a71d945 (bug 1411654) Backed out changeset 3dc3beab95f8 (bug 1411654) Backed out changeset 22a861db1573 (bug 1411654) Backed out changeset 0850b319efd4 (bug 1411654) Backed out changeset d276d3deba05 (bug 1411654)

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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/. */

#include "Image.h"
#include "Layers.h"               // for LayerManager
#include "nsRefreshDriver.h"
#include "mozilla/TimeStamp.h"
#include "mozilla/Tuple.h"        // for Tie

namespace mozilla {
namespace image {

///////////////////////////////////////////////////////////////////////////////
// Memory Reporting
///////////////////////////////////////////////////////////////////////////////

ImageMemoryCounter::ImageMemoryCounter(Image* aImage,
                                       SizeOfState& aState,
                                       bool aIsUsed)
  : mIsUsed(aIsUsed)
{
  MOZ_ASSERT(aImage);

  // Extract metadata about the image.
  RefPtr<ImageURL> imageURL(aImage->GetURI());
  if (imageURL) {
    imageURL->GetSpec(mURI);
  }

  int32_t width = 0;
  int32_t height = 0;
  aImage->GetWidth(&width);
  aImage->GetHeight(&height);
  mIntrinsicSize.SizeTo(width, height);

  mType = aImage->GetType();

  // Populate memory counters for source and decoded data.
  mValues.SetSource(aImage->SizeOfSourceWithComputedFallback(aState));
  aImage->CollectSizeOfSurfaces(mSurfaces, aState.mMallocSizeOf);

  // Compute totals.
  for (const SurfaceMemoryCounter& surfaceCounter : mSurfaces) {
    mValues += surfaceCounter.Values();
  }
}


///////////////////////////////////////////////////////////////////////////////
// Image Base Types
///////////////////////////////////////////////////////////////////////////////

void
ImageResource::SetCurrentImage(ImageContainer* aContainer,
                               SourceSurface* aSurface,
                               bool aInTransaction)
{
  MOZ_ASSERT(NS_IsMainThread());
  MOZ_ASSERT(aContainer);

  if (!aSurface) {
    // The OS threw out some or all of our buffer. We'll need to wait for the
    // redecode (which was automatically triggered by GetFrame) to complete.
    return;
  }

  // |image| holds a reference to a SourceSurface which in turn holds a lock on
  // the current frame's data buffer, ensuring that it doesn't get freed as
  // long as the layer system keeps this ImageContainer alive.
  RefPtr<layers::Image> image = new layers::SourceSurfaceImage(aSurface);

  // We can share the producer ID with other containers because it is only
  // used internally to validate the frames given to a particular container
  // so that another object cannot add its own. Similarly the frame ID is
  // only used internally to ensure it is always increasing, and skipping
  // IDs from an individual container's perspective is acceptable.
  AutoTArray<ImageContainer::NonOwningImage, 1> imageList;
  imageList.AppendElement(ImageContainer::NonOwningImage(image, TimeStamp(),
                                                         mLastFrameID++,
                                                         mImageProducerID));

  if (aInTransaction) {
    aContainer->SetCurrentImagesInTransaction(imageList);
  } else {
    aContainer->SetCurrentImages(imageList);
  }
}

already_AddRefed<ImageContainer>
ImageResource::GetImageContainerImpl(LayerManager* aManager,
                                     const IntSize& aSize,
                                     const Maybe<SVGImageContext>& aSVGContext,
                                     uint32_t aFlags)
{
  MOZ_ASSERT(NS_IsMainThread());
  MOZ_ASSERT(aManager);
  MOZ_ASSERT((aFlags & ~(FLAG_SYNC_DECODE |
                         FLAG_SYNC_DECODE_IF_FAST |
                         FLAG_ASYNC_NOTIFY |
                         FLAG_HIGH_QUALITY_SCALING))
               == FLAG_NONE,
             "Unsupported flag passed to GetImageContainer");

  IntSize size = GetImageContainerSize(aManager, aSize, aFlags);
  if (size.IsEmpty()) {
    return nullptr;
  }

  if (mAnimationConsumers == 0) {
    SendOnUnlockedDraw(aFlags);
  }

  uint32_t flags = (aFlags & ~(FLAG_SYNC_DECODE |
                               FLAG_SYNC_DECODE_IF_FAST)) | FLAG_ASYNC_NOTIFY;
  RefPtr<layers::ImageContainer> container;
  ImageContainerEntry* entry = nullptr;
  int i = mImageContainers.Length() - 1;
  for (; i >= 0; --i) {
    entry = &mImageContainers[i];
    container = entry->mContainer.get();
    if (size == entry->mSize && flags == entry->mFlags &&
        aSVGContext == entry->mSVGContext) {
      // Lack of a container is handled below.
      break;
    } else if (!container) {
      // Stop tracking if our weak pointer to the image container was freed.
      mImageContainers.RemoveElementAt(i);
    } else {
      // It isn't a match, but still valid. Forget the container so we don't
      // try to reuse it below.
      container = nullptr;
    }
  }

  if (container) {
    switch (entry->mLastDrawResult) {
      case ImgDrawResult::SUCCESS:
      case ImgDrawResult::BAD_IMAGE:
      case ImgDrawResult::BAD_ARGS:
        return container.forget();
      case ImgDrawResult::NOT_READY:
      case ImgDrawResult::INCOMPLETE:
      case ImgDrawResult::TEMPORARY_ERROR:
        // Temporary conditions where we need to rerequest the frame to recover.
        break;
      case ImgDrawResult::WRONG_SIZE:
        // Unused by GetFrameInternal
      default:
        MOZ_ASSERT_UNREACHABLE("Unhandled ImgDrawResult type!");
        return container.forget();
    }
  }

#ifdef DEBUG
  NotifyDrawingObservers();
#endif

  ImgDrawResult drawResult;
  IntSize bestSize;
  RefPtr<SourceSurface> surface;
  Tie(drawResult, bestSize, surface) =
    GetFrameInternal(size, aSVGContext, FRAME_CURRENT,
                     aFlags | FLAG_ASYNC_NOTIFY);

  // The requested size might be refused by the surface cache (i.e. due to
  // factor-of-2 mode). In that case we don't want to create an entry for this
  // specific size, but rather re-use the entry for the substituted size.
  if (bestSize != size) {
    MOZ_ASSERT(!bestSize.IsEmpty());

    // We can only remove the entry if we no longer have a container, because if
    // there are strong references to it remaining, we need to still update it
    // in UpdateImageContainer.
    if (i >= 0 && !container) {
      mImageContainers.RemoveElementAt(i);
    }

    // Forget about the stale container, if any. This lets the entry creation
    // logic do its job below, if it turns out there is no existing best entry
    // or the best entry doesn't have a container.
    container = nullptr;

    // We need to do the entry search again for the new size. We skip pruning
    // because we did this above once already, but ImageContainer is threadsafe,
    // so there is a remote possibility it got freed.
    i = mImageContainers.Length() - 1;
    for (; i >= 0; --i) {
      entry = &mImageContainers[i];
      if (bestSize == entry->mSize && flags == entry->mFlags &&
          aSVGContext == entry->mSVGContext) {
        container = entry->mContainer.get();
        if (container) {
          switch (entry->mLastDrawResult) {
            case ImgDrawResult::SUCCESS:
            case ImgDrawResult::BAD_IMAGE:
            case ImgDrawResult::BAD_ARGS:
              return container.forget();
            case ImgDrawResult::NOT_READY:
            case ImgDrawResult::INCOMPLETE:
            case ImgDrawResult::TEMPORARY_ERROR:
              // Temporary conditions where we need to rerequest the frame to
              // recover. We have already done so!
              break;
           case ImgDrawResult::WRONG_SIZE:
              // Unused by GetFrameInternal
            default:
              MOZ_ASSERT_UNREACHABLE("Unhandled DrawResult type!");
              return container.forget();
          }
        }
        break;
      }
    }
  }

  if (!container) {
    // We need a new ImageContainer, so create one.
    container = LayerManager::CreateImageContainer();

    if (i >= 0) {
      entry->mContainer = container;
    } else {
      entry = mImageContainers.AppendElement(
        ImageContainerEntry(bestSize, aSVGContext, container.get(), flags));
    }
  }

  SetCurrentImage(container, surface, true);
  entry->mLastDrawResult = drawResult;
  return container.forget();
}

void
ImageResource::UpdateImageContainer()
{
  MOZ_ASSERT(NS_IsMainThread());

  for (int i = mImageContainers.Length() - 1; i >= 0; --i) {
    ImageContainerEntry& entry = mImageContainers[i];
    RefPtr<ImageContainer> container = entry.mContainer.get();
    if (container) {
      IntSize bestSize;
      RefPtr<SourceSurface> surface;
      Tie(entry.mLastDrawResult, bestSize, surface) =
        GetFrameInternal(entry.mSize, entry.mSVGContext,
                         FRAME_CURRENT, entry.mFlags);

      // It is possible that this is a factor-of-2 substitution. Since we
      // managed to convert the weak reference into a strong reference, that
      // means that an imagelib user still is holding onto the container. thus
      // we cannot consolidate and must keep updating the duplicate container.
      SetCurrentImage(container, surface, false);
    } else {
      // Stop tracking if our weak pointer to the image container was freed.
      mImageContainers.RemoveElementAt(i);
    }
  }
}

void
ImageResource::ReleaseImageContainer()
{
  MOZ_ASSERT(NS_IsMainThread());
  mImageContainers.Clear();
}

// Constructor
ImageResource::ImageResource(ImageURL* aURI) :
  mURI(aURI),
  mInnerWindowId(0),
  mAnimationConsumers(0),
  mAnimationMode(kNormalAnimMode),
  mInitialized(false),
  mAnimating(false),
  mError(false),
  mImageProducerID(ImageContainer::AllocateProducerID()),
  mLastFrameID(0)
{ }

ImageResource::~ImageResource()
{
  // Ask our ProgressTracker to drop its weak reference to us.
  mProgressTracker->ResetImage();
}

void
ImageResource::IncrementAnimationConsumers()
{
  MOZ_ASSERT(NS_IsMainThread(), "Main thread only to encourage serialization "
                                "with DecrementAnimationConsumers");
  mAnimationConsumers++;
}

void
ImageResource::DecrementAnimationConsumers()
{
  MOZ_ASSERT(NS_IsMainThread(), "Main thread only to encourage serialization "
                                "with IncrementAnimationConsumers");
  MOZ_ASSERT(mAnimationConsumers >= 1,
             "Invalid no. of animation consumers!");
  mAnimationConsumers--;
}

nsresult
ImageResource::GetAnimationModeInternal(uint16_t* aAnimationMode)
{
  if (mError) {
    return NS_ERROR_FAILURE;
  }

  NS_ENSURE_ARG_POINTER(aAnimationMode);

  *aAnimationMode = mAnimationMode;
  return NS_OK;
}

nsresult
ImageResource::SetAnimationModeInternal(uint16_t aAnimationMode)
{
  if (mError) {
    return NS_ERROR_FAILURE;
  }

  NS_ASSERTION(aAnimationMode == kNormalAnimMode ||
               aAnimationMode == kDontAnimMode ||
               aAnimationMode == kLoopOnceAnimMode,
               "Wrong Animation Mode is being set!");

  mAnimationMode = aAnimationMode;

  return NS_OK;
}

bool
ImageResource::HadRecentRefresh(const TimeStamp& aTime)
{
  // Our threshold for "recent" is 1/2 of the default refresh-driver interval.
  // This ensures that we allow for frame rates at least as fast as the
  // refresh driver's default rate.
  static TimeDuration recentThreshold =
      TimeDuration::FromMilliseconds(nsRefreshDriver::DefaultInterval() / 2.0);

  if (!mLastRefreshTime.IsNull() &&
      aTime - mLastRefreshTime < recentThreshold) {
    return true;
  }

  // else, we can proceed with a refresh.
  // But first, update our last refresh time:
  mLastRefreshTime = aTime;
  return false;
}

void
ImageResource::EvaluateAnimation()
{
  if (!mAnimating && ShouldAnimate()) {
    nsresult rv = StartAnimation();
    mAnimating = NS_SUCCEEDED(rv);
  } else if (mAnimating && !ShouldAnimate()) {
    StopAnimation();
  }
}

void
ImageResource::SendOnUnlockedDraw(uint32_t aFlags)
{
  if (!mProgressTracker) {
    return;
  }

  if (!(aFlags & FLAG_ASYNC_NOTIFY)) {
    mProgressTracker->OnUnlockedDraw();
  } else {
    NotNull<RefPtr<ImageResource>> image = WrapNotNull(this);
    nsCOMPtr<nsIEventTarget> eventTarget = mProgressTracker->GetEventTarget();
    nsCOMPtr<nsIRunnable> ev = NS_NewRunnableFunction(
      "image::ImageResource::SendOnUnlockedDraw", [=]() -> void {
        RefPtr<ProgressTracker> tracker = image->GetProgressTracker();
        if (tracker) {
          tracker->OnUnlockedDraw();
        }
      });
    eventTarget->Dispatch(ev.forget(), NS_DISPATCH_NORMAL);
  }
}

#ifdef DEBUG
void
ImageResource::NotifyDrawingObservers()
{
  if (!mURI || !NS_IsMainThread()) {
    return;
  }

  bool match = false;
  if ((NS_FAILED(mURI->SchemeIs("resource", &match)) || !match) &&
      (NS_FAILED(mURI->SchemeIs("chrome", &match)) || !match)) {
    return;
  }

  // Record the image drawing for startup performance testing.
  nsCOMPtr<nsIObserverService> obs = services::GetObserverService();
  NS_WARNING_ASSERTION(obs, "Can't get an observer service handle");
  if (obs) {
    nsCOMPtr<nsIURI> imageURI = mURI->ToIURI();
    nsAutoCString spec;
    imageURI->GetSpec(spec);
    obs->NotifyObservers(nullptr, "image-drawing", NS_ConvertUTF8toUTF16(spec).get());
  }
}
#endif

} // namespace image
} // namespace mozilla