Quelle imgTools.cpp Sprache: C

/* -*- 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 "imgTools.h"

#include "DecodePool.h"
#include "gfxUtils.h"
#include "mozilla/gfx/2D.h"
#include "mozilla/gfx/Logging.h"
#include "mozilla/RefPtr.h"
#include "nsCOMPtr.h"
#include "mozilla/dom/Document.h"
#include "nsError.h"
#include "imgLoader.h"
#include "imgICache.h"
#include "imgIContainer.h"
#include "imgIEncoder.h"
#include "nsComponentManagerUtils.h"
#include "nsNetUtil.h"  // for NS_NewBufferedInputStream
#include "nsStreamUtils.h"
#include "nsStringStream.h"
#include "nsContentUtils.h"
#include "nsProxyRelease.h"
#include "nsIStreamListener.h"
#include "ImageFactory.h"
#include "Image.h"
#include "IProgressObserver.h"
#include "ScriptedNotificationObserver.h"
#include "imgIScriptedNotificationObserver.h"
#include "gfxPlatform.h"
#include "js/ArrayBuffer.h"
#include "js/RootingAPI.h"  // JS::{Handle,Rooted}
#include "js/Value.h"       // JS::Value
#include "Orientation.h"

using namespace mozilla::gfx;

namespace mozilla {
namespace image {

namespace {

static nsresult sniff_mimetype_callback(nsIInputStream* in, void* data,
                                        const char* fromRawSegment,
                                        uint32_t toOffset, uint32_t count,
                                        uint32_t* writeCount) {
  nsCString* mimeType = static_cast<nsCString*>(data);
  MOZ_ASSERT(mimeType, "mimeType is null!");

  if (count > 0) {
    imgLoader::GetMimeTypeFromContent(fromRawSegment, count, *mimeType);
  }

  *writeCount = 0;
  return NS_ERROR_FAILURE;
}

class ImageDecoderListener final : public nsIStreamListener,
                                   public IProgressObserver,
                                   public imgIContainer {
public:
  NS_DECL_ISUPPORTS

  ImageDecoderListener(nsIURI* aURI, imgIContainerCallback* aCallback,
                       imgINotificationObserver* aObserver)
      : mURI(aURI),
        mImage(nullptr),
        mCallback(aCallback),
        mObserver(aObserver) {
    MOZ_ASSERT(NS_IsMainThread());
  }

  NS_IMETHOD
  OnDataAvailable(nsIRequest* aRequest, nsIInputStream* aInputStream,
                  uint64_t aOffset, uint32_t aCount) override {
    if (!mImage) {
      nsCOMPtr<nsIChannel> channel = do_QueryInterface(aRequest);

      nsCString mimeType;
      channel->GetContentType(mimeType);

      if (aInputStream) {
        // Look at the first few bytes and see if we can tell what the data is
        // from that since servers tend to lie. :(
        uint32_t unused;
        aInputStream->ReadSegments(sniff_mimetype_callback, &mimeType, aCount,
                                   &unused);
      }

      RefPtr<ProgressTracker> tracker = new ProgressTracker();
      if (mObserver) {
        tracker->AddObserver(this);
      }

      mImage = ImageFactory::CreateImage(channel, tracker, mimeType, mURI,
                                         /* aIsMultiPart */ false, 0);

      if (mImage->HasError()) {
        return NS_ERROR_FAILURE;
      }
    }

    return mImage->OnImageDataAvailable(aRequest, aInputStream, aOffset,
                                        aCount);
  }

  NS_IMETHOD
  OnStartRequest(nsIRequest* aRequest) override { return NS_OK; }

  NS_IMETHOD
  OnStopRequest(nsIRequest* aRequest, nsresult aStatus) override {
    // Encouter a fetch error, or no data could be fetched.
    if (!mImage || NS_FAILED(aStatus)) {
      mCallback->OnImageReady(nullptr, mImage ? aStatus : NS_ERROR_FAILURE);
      return NS_OK;
    }

    mImage->OnImageDataComplete(aRequest, aStatus, true);
    nsCOMPtr<imgIContainer> container = this;
    mCallback->OnImageReady(container, aStatus);
    return NS_OK;
  }

  virtual void Notify(int32_t aType,
                      const nsIntRect* aRect = nullptr) override {
    if (mObserver) {
      mObserver->Notify(nullptr, aType, aRect);
    }
  }

  virtual void OnLoadComplete(bool aLastPart) override {}

  // Other notifications are ignored.
  virtual void SetHasImage() override {}
  virtual bool NotificationsDeferred() const override { return false; }
  virtual void MarkPendingNotify() override {}
  virtual void ClearPendingNotify() override {}

  // imgIContainer
  NS_FORWARD_IMGICONTAINER(mImage->)

private:
  virtual ~ImageDecoderListener() = default;

  nsCOMPtr<nsIURI> mURI;
  RefPtr<image::Image> mImage;
  nsCOMPtr<imgIContainerCallback> mCallback;
  nsCOMPtr<imgINotificationObserver> mObserver;
};

NS_IMPL_ISUPPORTS(ImageDecoderListener, nsIStreamListener, imgIContainer)

class ImageDecoderHelper final : public Runnable,
                                 public nsIInputStreamCallback {
public:
  NS_DECL_ISUPPORTS_INHERITED

  ImageDecoderHelper(already_AddRefed<image::Image> aImage,
                     already_AddRefed<nsIInputStream> aInputStream,
                     nsIEventTarget* aEventTarget,
                     imgIContainerCallback* aCallback,
                     nsIEventTarget* aCallbackEventTarget)
      : Runnable("ImageDecoderHelper"),
        mImage(std::move(aImage)),
        mInputStream(std::move(aInputStream)),
        mEventTarget(aEventTarget),
        mCallback(aCallback),
        mCallbackEventTarget(aCallbackEventTarget),
        mStatus(NS_OK) {
    MOZ_ASSERT(NS_IsMainThread());
  }

  NS_IMETHOD
  Run() override {
    // This runnable is dispatched on the Image thread when reading data, but
    // at the end, it goes back to the main-thread in order to complete the
    // operation.
    if (NS_IsMainThread()) {
      // Let the Image know we've sent all the data.
      mImage->OnImageDataComplete(nullptr, mStatus, true);

      RefPtr<ProgressTracker> tracker = mImage->GetProgressTracker();
      tracker->SyncNotifyProgress(FLAG_LOAD_COMPLETE);

      nsCOMPtr<imgIContainer> container;
      if (NS_SUCCEEDED(mStatus)) {
        container = mImage;
      }

      mCallback->OnImageReady(container, mStatus);
      return NS_OK;
    }

    uint64_t length;
    nsresult rv = mInputStream->Available(&length);
    if (rv == NS_BASE_STREAM_CLOSED) {
      return OperationCompleted(NS_OK);
    }

    if (NS_WARN_IF(NS_FAILED(rv))) {
      return OperationCompleted(rv);
    }

    // Nothing else to read, but maybe we just need to wait.
    if (length == 0) {
      nsCOMPtr<nsIAsyncInputStream> asyncInputStream =
          do_QueryInterface(mInputStream);
      if (asyncInputStream) {
        rv = asyncInputStream->AsyncWait(this, 0, 0, mEventTarget);
        if (NS_WARN_IF(NS_FAILED(rv))) {
          return OperationCompleted(rv);
        }
        return NS_OK;
      }

      // We really have nothing else to read.
      if (length == 0) {
        return OperationCompleted(NS_OK);
      }
    }

    // Send the source data to the Image.
    rv = mImage->OnImageDataAvailable(nullptr, mInputStream, 0,
                                      uint32_t(length));
    if (NS_WARN_IF(NS_FAILED(rv))) {
      return OperationCompleted(rv);
    }

    rv = mEventTarget->Dispatch(this, NS_DISPATCH_NORMAL);
    if (NS_WARN_IF(NS_FAILED(rv))) {
      return OperationCompleted(rv);
    }

    return NS_OK;
  }

  NS_IMETHOD
  OnInputStreamReady(nsIAsyncInputStream* aAsyncInputStream) override {
    MOZ_ASSERT(!NS_IsMainThread());
    return Run();
  }

  nsresult OperationCompleted(nsresult aStatus) {
    MOZ_ASSERT(!NS_IsMainThread());

    mStatus = aStatus;
    mCallbackEventTarget->Dispatch(this, NS_DISPATCH_NORMAL);
    return NS_OK;
  }

private:
  ~ImageDecoderHelper() {
    SurfaceCache::ReleaseImageOnMainThread(mImage.forget());
    NS_ReleaseOnMainThread("ImageDecoderHelper::mCallback", mCallback.forget());
  }

  RefPtr<image::Image> mImage;

  nsCOMPtr<nsIInputStream> mInputStream;
  nsCOMPtr<nsIEventTarget> mEventTarget;
  nsCOMPtr<imgIContainerCallback> mCallback;
  nsCOMPtr<nsIEventTarget> mCallbackEventTarget;

  nsresult mStatus;
};

NS_IMPL_ISUPPORTS_INHERITED(ImageDecoderHelper, Runnable,
                            nsIInputStreamCallback)

}  // namespace

/* ========== imgITools implementation ========== */

NS_IMPL_ISUPPORTS(imgTools, imgITools)

imgTools::imgTools() { /* member initializers and constructor code */ }

imgTools::~imgTools() { /* destructor code */ }

NS_IMETHODIMP
imgTools::DecodeImageFromArrayBuffer(JS::Handle<JS::Value> aArrayBuffer,
                                     const nsACString& aMimeType,
                                     JSContext* aCx,
                                     imgIContainer** aContainer) {
  if (!aArrayBuffer.isObject()) {
    return NS_ERROR_FAILURE;
  }

  JS::Rooted<JSObject*> obj(aCx,
                            JS::UnwrapArrayBuffer(&aArrayBuffer.toObject()));
  if (!obj) {
    return NS_ERROR_FAILURE;
  }

  uint8_t* bufferData = nullptr;
  size_t bufferLength = 0;
  bool isSharedMemory = false;

  JS::GetArrayBufferLengthAndData(obj, &bufferLength, &isSharedMemory,
                                  &bufferData);

  // Throw for large ArrayBuffers to prevent truncation.
  if (bufferLength > INT32_MAX) {
    return NS_ERROR_ILLEGAL_VALUE;
  }

  return DecodeImageFromBuffer((char*)bufferData, bufferLength, aMimeType,
                               aContainer);
}

NS_IMETHODIMP
imgTools::DecodeImageFromBuffer(const char* aBuffer, uint32_t aSize,
                                const nsACString& aMimeType,
                                imgIContainer** aContainer) {
  MOZ_ASSERT(NS_IsMainThread());

  NS_ENSURE_ARG_POINTER(aBuffer);

  // Create a new image container to hold the decoded data.
  nsAutoCString mimeType(aMimeType);
  RefPtr<image::Image> image =
      ImageFactory::CreateAnonymousImage(mimeType, aSize);
  RefPtr<ProgressTracker> tracker = image->GetProgressTracker();

  if (image->HasError()) {
    return NS_ERROR_FAILURE;
  }

  // Let's create a temporary inputStream.
  nsCOMPtr<nsIInputStream> stream;
  nsresult rv = NS_NewByteInputStream(
      getter_AddRefs(stream), Span(aBuffer, aSize), NS_ASSIGNMENT_DEPEND);
  NS_ENSURE_SUCCESS(rv, rv);
  MOZ_ASSERT(stream);
  MOZ_ASSERT(NS_InputStreamIsBuffered(stream));

  rv = image->OnImageDataAvailable(nullptr, stream, 0, aSize);
  NS_ENSURE_SUCCESS(rv, rv);

  // Let the Image know we've sent all the data.
  rv = image->OnImageDataComplete(nullptr, NS_OK, true);
  tracker->SyncNotifyProgress(FLAG_LOAD_COMPLETE);
  NS_ENSURE_SUCCESS(rv, rv);

  // All done.
  image.forget(aContainer);
  return NS_OK;
}

NS_IMETHODIMP
imgTools::DecodeImageFromChannelAsync(nsIURI* aURI, nsIChannel* aChannel,
                                      imgIContainerCallback* aCallback,
                                      imgINotificationObserver* aObserver) {
  MOZ_ASSERT(NS_IsMainThread());

  NS_ENSURE_ARG_POINTER(aURI);
  NS_ENSURE_ARG_POINTER(aChannel);
  NS_ENSURE_ARG_POINTER(aCallback);

  RefPtr<ImageDecoderListener> listener =
      new ImageDecoderListener(aURI, aCallback, aObserver);

  return aChannel->AsyncOpen(listener);
}

NS_IMETHODIMP
imgTools::DecodeImageAsync(nsIInputStream* aInStr, const nsACString& aMimeType,
                           imgIContainerCallback* aCallback,
                           nsIEventTarget* aEventTarget) {
  MOZ_ASSERT(NS_IsMainThread());

  NS_ENSURE_ARG_POINTER(aInStr);
  NS_ENSURE_ARG_POINTER(aCallback);
  NS_ENSURE_ARG_POINTER(aEventTarget);

  nsresult rv;

  // Let's continuing the reading on a separate thread.
  DecodePool* decodePool = DecodePool::Singleton();
  MOZ_ASSERT(decodePool);

  RefPtr<nsIEventTarget> target = decodePool->GetIOEventTarget();
  NS_ENSURE_TRUE(target, NS_ERROR_FAILURE);

  // Prepare the input stream.
  nsCOMPtr<nsIInputStream> stream = aInStr;
  if (!NS_InputStreamIsBuffered(aInStr)) {
    nsCOMPtr<nsIInputStream> bufStream;
    rv = NS_NewBufferedInputStream(getter_AddRefs(bufStream), stream.forget(),
                                   1024);
    NS_ENSURE_SUCCESS(rv, rv);
    stream = std::move(bufStream);
  }

  // Create a new image container to hold the decoded data.
  nsAutoCString mimeType(aMimeType);
  RefPtr<image::Image> image = ImageFactory::CreateAnonymousImage(mimeType, 0);

  // Already an error?
  if (image->HasError()) {
    return NS_ERROR_FAILURE;
  }

  RefPtr<ImageDecoderHelper> helper = new ImageDecoderHelper(
      image.forget(), stream.forget(), target, aCallback, aEventTarget);
  rv = target->Dispatch(helper.forget(), NS_DISPATCH_NORMAL);
  NS_ENSURE_SUCCESS(rv, rv);

  return NS_OK;
}

/**
* This takes a DataSourceSurface rather than a SourceSurface because some
* of the callers have a DataSourceSurface and we don't want to call
* GetDataSurface on such surfaces since that may incur a conversion to
* SurfaceType::DATA which we don't need.
*/
static nsresult EncodeImageData(DataSourceSurface* aDataSurface,
                                DataSourceSurface::ScopedMap& aMap,
                                const nsACString& aMimeType,
                                const nsAString& aOutputOptions,
                                nsIInputStream** aStream) {
  MOZ_ASSERT(aDataSurface->GetFormat() == SurfaceFormat::B8G8R8A8 ||
                 aDataSurface->GetFormat() == SurfaceFormat::B8G8R8X8,
             "We're assuming B8G8R8A8/X8");

  // Get an image encoder for the media type
  nsAutoCString encoderCID("@mozilla.org/image/encoder;2?type="_ns + aMimeType);

  nsCOMPtr<imgIEncoder> encoder = do_CreateInstance(encoderCID.get());
  if (!encoder) {
    return NS_IMAGELIB_ERROR_NO_ENCODER;
  }

  IntSize size = aDataSurface->GetSize();
  uint32_t dataLength = aMap.GetStride() * size.height;

  // Encode the bitmap
  nsresult rv = encoder->InitFromData(
      aMap.GetData(), dataLength, size.width, size.height, aMap.GetStride(),
      imgIEncoder::INPUT_FORMAT_HOSTARGB, aOutputOptions);
  NS_ENSURE_SUCCESS(rv, rv);

  encoder.forget(aStream);
  return NS_OK;
}

static nsresult EncodeImageData(DataSourceSurface* aDataSurface,
                                const nsACString& aMimeType,
                                const nsAString& aOutputOptions,
                                nsIInputStream** aStream) {
  DataSourceSurface::ScopedMap map(aDataSurface, DataSourceSurface::READ);
  if (!map.IsMapped()) {
    return NS_ERROR_FAILURE;
  }

  return EncodeImageData(aDataSurface, map, aMimeType, aOutputOptions, aStream);
}

NS_IMETHODIMP
imgTools::EncodeImage(imgIContainer* aContainer, const nsACString& aMimeType,
                      const nsAString& aOutputOptions,
                      nsIInputStream** aStream) {
  // Use frame 0 from the image container.
  RefPtr<SourceSurface> frame = aContainer->GetFrame(
      imgIContainer::FRAME_FIRST,
      imgIContainer::FLAG_SYNC_DECODE | imgIContainer::FLAG_ASYNC_NOTIFY);
  NS_ENSURE_TRUE(frame, NS_ERROR_FAILURE);

  RefPtr<DataSourceSurface> dataSurface;

  if (frame->GetFormat() == SurfaceFormat::B8G8R8A8 ||
      frame->GetFormat() == SurfaceFormat::B8G8R8X8) {
    dataSurface = frame->GetDataSurface();
  } else {
    // Convert format to SurfaceFormat::B8G8R8A8
    dataSurface = gfxUtils::CopySurfaceToDataSourceSurfaceWithFormat(
        frame, SurfaceFormat::B8G8R8A8);
  }

  NS_ENSURE_TRUE(dataSurface, NS_ERROR_FAILURE);

  return EncodeImageData(dataSurface, aMimeType, aOutputOptions, aStream);
}

NS_IMETHODIMP
imgTools::EncodeScaledImage(imgIContainer* aContainer,
                            const nsACString& aMimeType, int32_t aScaledWidth,
                            int32_t aScaledHeight,
                            const nsAString& aOutputOptions,
                            nsIInputStream** aStream) {
  NS_ENSURE_ARG(aScaledWidth >= 0 && aScaledHeight >= 0);

  // If no scaled size is specified, we'll just encode the image at its
  // original size (no scaling).
  if (aScaledWidth == 0 && aScaledHeight == 0) {
    return EncodeImage(aContainer, aMimeType, aOutputOptions, aStream);
  }

  // Retrieve the image's size.
  int32_t imageWidth = 0;
  int32_t imageHeight = 0;
  aContainer->GetWidth(&imageWidth);
  aContainer->GetHeight(&imageHeight);

  // If the given width or height is zero we'll replace it with the image's
  // original dimensions.
  IntSize scaledSize(aScaledWidth == 0 ? imageWidth : aScaledWidth,
                     aScaledHeight == 0 ? imageHeight : aScaledHeight);

  // Use frame 0 from the image container.
  RefPtr<SourceSurface> frame = aContainer->GetFrameAtSize(
      scaledSize, imgIContainer::FRAME_FIRST,
      imgIContainer::FLAG_HIGH_QUALITY_SCALING |
          imgIContainer::FLAG_SYNC_DECODE | imgIContainer::FLAG_ASYNC_NOTIFY);
  NS_ENSURE_TRUE(frame, NS_ERROR_FAILURE);

  // If the given surface is the right size/format, we can encode it directly.
  if (scaledSize == frame->GetSize() &&
      (frame->GetFormat() == SurfaceFormat::B8G8R8A8 ||
       frame->GetFormat() == SurfaceFormat::B8G8R8X8)) {
    RefPtr<DataSourceSurface> dataSurface = frame->GetDataSurface();
    if (dataSurface) {
      return EncodeImageData(dataSurface, aMimeType, aOutputOptions, aStream);
    }
  }

  // Otherwise we need to scale it using a draw target.
  // Ensure the surface is initialized to clear in case we need to blend to it.
  RefPtr<DataSourceSurface> dataSurface = Factory::CreateDataSourceSurface(
      scaledSize, SurfaceFormat::B8G8R8A8, true);
  if (NS_WARN_IF(!dataSurface)) {
    return NS_ERROR_FAILURE;
  }

  DataSourceSurface::ScopedMap map(dataSurface, DataSourceSurface::READ_WRITE);
  if (!map.IsMapped()) {
    return NS_ERROR_FAILURE;
  }

  RefPtr<DrawTarget> dt = Factory::CreateDrawTargetForData(
      BackendType::SKIA, map.GetData(), dataSurface->GetSize(), map.GetStride(),
      SurfaceFormat::B8G8R8A8);
  if (!dt) {
    gfxWarning() << "imgTools::EncodeImage failed in CreateDrawTargetForData";
    return NS_ERROR_OUT_OF_MEMORY;
  }

  // Prefer using OP_OVER to scale the surface instead of OP_SOURCE, as both
  // D2D and Skia have specific fast-paths for these, and may give divergent
  // and slower results when using OP_SOURCE.
  IntSize frameSize = frame->GetSize();
  dt->DrawSurface(frame, Rect(0, 0, scaledSize.width, scaledSize.height),
                  Rect(0, 0, frameSize.width, frameSize.height),
                  DrawSurfaceOptions(),
                  DrawOptions(1.0f, CompositionOp::OP_OVER));

  return EncodeImageData(dataSurface, map, aMimeType, aOutputOptions, aStream);
}

NS_IMETHODIMP
imgTools::EncodeCroppedImage(imgIContainer* aContainer,
                             const nsACString& aMimeType, int32_t aOffsetX,
                             int32_t aOffsetY, int32_t aWidth, int32_t aHeight,
                             const nsAString& aOutputOptions,
                             nsIInputStream** aStream) {
  NS_ENSURE_ARG(aOffsetX >= 0 && aOffsetY >= 0 && aWidth >= 0 && aHeight >= 0);

  // Offsets must be zero when no width and height are given or else we're out
  // of bounds.
  NS_ENSURE_ARG(aWidth + aHeight > 0 || aOffsetX + aOffsetY == 0);

  // If no size is specified then we'll preserve the image's original dimensions
  // and don't need to crop.
  if (aWidth == 0 && aHeight == 0) {
    return EncodeImage(aContainer, aMimeType, aOutputOptions, aStream);
  }

  // Use frame 0 from the image container.
  RefPtr<SourceSurface> frame = aContainer->GetFrame(
      imgIContainer::FRAME_FIRST,
      imgIContainer::FLAG_SYNC_DECODE | imgIContainer::FLAG_ASYNC_NOTIFY);
  NS_ENSURE_TRUE(frame, NS_ERROR_FAILURE);

  int32_t frameWidth = frame->GetSize().width;
  int32_t frameHeight = frame->GetSize().height;

  // If the given width or height is zero we'll replace it with the image's
  // original dimensions.
  if (aWidth == 0) {
    aWidth = frameWidth;
  } else if (aHeight == 0) {
    aHeight = frameHeight;
  }

  // Check that the given crop rectangle is within image bounds.
  NS_ENSURE_ARG(frameWidth >= aOffsetX + aWidth &&
                frameHeight >= aOffsetY + aHeight);

  RefPtr<DataSourceSurface> dataSurface = Factory::CreateDataSourceSurface(
      IntSize(aWidth, aHeight), SurfaceFormat::B8G8R8A8,
      /* aZero = */ true);
  if (NS_WARN_IF(!dataSurface)) {
    return NS_ERROR_FAILURE;
  }

  DataSourceSurface::ScopedMap map(dataSurface, DataSourceSurface::READ_WRITE);
  if (!map.IsMapped()) {
    return NS_ERROR_FAILURE;
  }

  RefPtr<DrawTarget> dt = Factory::CreateDrawTargetForData(
      BackendType::SKIA, map.GetData(), dataSurface->GetSize(), map.GetStride(),
      SurfaceFormat::B8G8R8A8);
  if (!dt) {
    gfxWarning()
        << "imgTools::EncodeCroppedImage failed in CreateDrawTargetForData";
    return NS_ERROR_OUT_OF_MEMORY;
  }
  dt->CopySurface(frame, IntRect(aOffsetX, aOffsetY, aWidth, aHeight),
                  IntPoint(0, 0));

  return EncodeImageData(dataSurface, map, aMimeType, aOutputOptions, aStream);
}

NS_IMETHODIMP
imgTools::CreateScriptedObserver(imgIScriptedNotificationObserver* aInner,
                                 imgINotificationObserver** aObserver) {
  NS_ADDREF(*aObserver = new ScriptedNotificationObserver(aInner));
  return NS_OK;
}

NS_IMETHODIMP
imgTools::GetImgLoaderForDocument(dom::Document* aDoc, imgILoader** aLoader) {
  NS_IF_ADDREF(*aLoader = nsContentUtils::GetImgLoaderForDocument(aDoc));
  return NS_OK;
}

NS_IMETHODIMP
imgTools::GetImgCacheForDocument(dom::Document* aDoc, imgICache** aCache) {
  nsCOMPtr<imgILoader> loader;
  nsresult rv = GetImgLoaderForDocument(aDoc, getter_AddRefs(loader));
  NS_ENSURE_SUCCESS(rv, rv);
  return CallQueryInterface(loader, aCache);
}

}  // namespace image
}  // namespace mozilla

quality100%

¤ Dauer der Verarbeitung: 0.14 Sekunden (vorverarbeitet) ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.