image/Image.cpp
author Andrew Halberstadt <ahalberstadt@mozilla.com>
Thu, 19 Apr 2018 16:12:26 -0400
changeset 416926 9a2ba1c7b0ec32f81e067acd2610e47b9be7d764
parent 411900 c989bd874ddb726eb0d2c6390441d844e11098b2
child 421522 7597bbcc9d66111326aa69048ad5847bdc7497f2
permissions -rw-r--r--
Bug 1451159 - [testing/profiles] Store profile data in actual profile look alike folders r=gbrown This moves testing/profiles/prefs_general.js to testing/profiles/common/user.js. It also adds an 'extensions' folder to the common profile. Dropping extension files here will get them installed in all test harnesses (useful for testing on try). The idea is that all test harnesses will eventually use this 'common' profile. We'll also create some new per harness profiles, e.g testing/profiles/mochitest and testing/profiles/reftest. This way there will be a single location developers can go to set preferences, both for a specific harness, and across all harnesses. MozReview-Commit-ID: 8sqBqLiypgU

/* -*- 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 "nsContentUtils.h"
#include "mozilla/SizeOfState.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<nsIURI> uri = mURI->ToIURI();
  nsContentUtils::AddScriptRunner(NS_NewRunnableFunction(
    "image::ImageResource::NotifyDrawingObservers", [uri]() {
      nsCOMPtr<nsIObserverService> obs = services::GetObserverService();
      NS_WARNING_ASSERTION(obs, "Can't get an observer service handle");
      if (obs) {
        nsAutoCString spec;
        uri->GetSpec(spec);
        obs->NotifyObservers(nullptr, "image-drawing", NS_ConvertUTF8toUTF16(spec).get());
      }
    }));
}
#endif

} // namespace image
} // namespace mozilla