Quelle ImageFactory.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 "ImageFactory.h"

#include <algorithm>

#include "mozilla/Likely.h"

#include "nsIChannel.h"
#include "nsIFileChannel.h"
#include "nsIObserverService.h"
#include "nsIFile.h"
#include "nsMimeTypes.h"
#include "nsIRequest.h"

#include "MultipartImage.h"
#include "RasterImage.h"
#include "VectorImage.h"
#include "Image.h"
#include "nsMediaFragmentURIParser.h"
#include "nsContentUtils.h"

#include "mozilla/SchedulerGroup.h"
#include "mozilla/StaticPrefs_image.h"
#include "mozilla/ProfilerMarkers.h"

namespace mozilla {
namespace image {

/*static*/
void ImageFactory::Initialize() {}

static uint32_t ComputeImageFlags(nsIURI* uri, const nsCString& aMimeType,
                                  bool isMultiPart) {
  // We default to the static globals.
  bool isDiscardable = StaticPrefs::image_mem_discardable();
  bool doDecodeImmediately = StaticPrefs::image_decode_immediately_enabled();

  // We want UI to be as snappy as possible and not to flicker. Disable
  // discarding for chrome URLS.
  if (uri->SchemeIs("chrome")) {
    isDiscardable = false;
  }

  // We don't want resources like the "loading" icon to be discardable either.
  if (uri->SchemeIs("resource")) {
    isDiscardable = false;
  }

  // For multipart/x-mixed-replace, we basically want a direct channel to the
  // decoder. Disable everything for this case.
  if (isMultiPart) {
    isDiscardable = false;
  }

  // We have all the information we need.
  uint32_t imageFlags = Image::INIT_FLAG_NONE;
  if (isDiscardable) {
    imageFlags |= Image::INIT_FLAG_DISCARDABLE;
  }
  if (doDecodeImmediately) {
    imageFlags |= Image::INIT_FLAG_DECODE_IMMEDIATELY;
  }
  if (isMultiPart) {
    imageFlags |= Image::INIT_FLAG_TRANSIENT;
  }

  // Synchronously decode metadata (including size) if we have a data URI since
  // the data is immediately available.
  if (uri->SchemeIs("data")) {
    imageFlags |= Image::INIT_FLAG_SYNC_LOAD;
  }

  return imageFlags;
}

#ifdef DEBUG
static void NotifyImageLoading(nsIURI* aURI) {
  if (!NS_IsMainThread()) {
    nsCOMPtr<nsIURI> uri(aURI);
    nsCOMPtr<nsIRunnable> ev = NS_NewRunnableFunction(
        "NotifyImageLoading", [uri]() -> void { NotifyImageLoading(uri); });
    NS_DispatchToMainThread(ev.forget());
    return;
  }

  nsCOMPtr<nsIObserverService> obs = services::GetObserverService();
  NS_WARNING_ASSERTION(obs, "Can't get an observer service handle");
  if (obs) {
    nsAutoCString spec;
    aURI->GetSpec(spec);
    obs->NotifyObservers(nullptr, "image-loading",
                         NS_ConvertUTF8toUTF16(spec).get());
  }
}
#endif

/* static */
already_AddRefed<Image> ImageFactory::CreateImage(
    nsIRequest* aRequest, ProgressTracker* aProgressTracker,
    const nsCString& aMimeType, nsIURI* aURI, bool aIsMultiPart,
    uint64_t aInnerWindowId) {
  // Compute the image's initialization flags.
  uint32_t imageFlags = ComputeImageFlags(aURI, aMimeType, aIsMultiPart);

#ifdef DEBUG
  // Record the image load for startup performance testing.
  if (aURI->SchemeIs("resource") || aURI->SchemeIs("chrome")) {
    NotifyImageLoading(aURI);
  }
#endif

  if (profiler_thread_is_being_profiled_for_markers()) {
    static const size_t sMaxTruncatedLength = 1024;
    PROFILER_MARKER_TEXT(
        "Image Load", GRAPHICS, MarkerInnerWindowId(aInnerWindowId),
        nsContentUtils::TruncatedURLForDisplay(aURI, sMaxTruncatedLength));
  }

  // Select the type of image to create based on MIME type.
  if (aMimeType.EqualsLiteral(IMAGE_SVG_XML)) {
    return CreateVectorImage(aRequest, aProgressTracker, aMimeType, aURI,
                             imageFlags, aInnerWindowId);
  } else {
    return CreateRasterImage(aRequest, aProgressTracker, aMimeType, aURI,
                             imageFlags, aInnerWindowId);
  }
}

// Marks an image as having an error before returning it.
template <typename T>
static already_AddRefed<Image> BadImage(const char* aMessage,
                                        RefPtr<T>& aImage) {
  aImage->SetHasError();
  return aImage.forget();
}

/* static */
already_AddRefed<Image> ImageFactory::CreateAnonymousImage(
    const nsCString& aMimeType, uint32_t aSizeHint /* = 0 */) {
  nsresult rv;

  RefPtr<RasterImage> newImage = new RasterImage();

  RefPtr<ProgressTracker> newTracker = new ProgressTracker();
  newTracker->SetImage(newImage);
  newImage->SetProgressTracker(newTracker);

  rv = newImage->Init(aMimeType.get(), Image::INIT_FLAG_SYNC_LOAD);
  if (NS_FAILED(rv)) {
    return BadImage("RasterImage::Init failed", newImage);
  }

  rv = newImage->SetSourceSizeHint(aSizeHint);
  if (NS_FAILED(rv)) {
    return BadImage("RasterImage::SetSourceSizeHint failed", newImage);
  }

  return newImage.forget();
}

/* static */
already_AddRefed<MultipartImage> ImageFactory::CreateMultipartImage(
    Image* aFirstPart, ProgressTracker* aProgressTracker) {
  MOZ_ASSERT(aFirstPart);
  MOZ_ASSERT(aProgressTracker);

  RefPtr<MultipartImage> newImage = new MultipartImage(aFirstPart);
  aProgressTracker->SetImage(newImage);
  newImage->SetProgressTracker(aProgressTracker);

  newImage->Init();

  return newImage.forget();
}

int32_t SaturateToInt32(int64_t val) {
  if (val > INT_MAX) {
    return INT_MAX;
  }
  if (val < INT_MIN) {
    return INT_MIN;
  }

  return static_cast<int32_t>(val);
}

uint32_t GetContentSize(nsIRequest* aRequest) {
  nsCOMPtr<nsIChannel> channel(do_QueryInterface(aRequest));
  if (channel) {
    int64_t size;
    nsresult rv = channel->GetContentLength(&size);
    if (NS_SUCCEEDED(rv)) {
      return std::max(SaturateToInt32(size), 0);
    }
  }

  // Use the file size as a size hint for file channels.
  nsCOMPtr<nsIFileChannel> fileChannel(do_QueryInterface(aRequest));
  if (fileChannel) {
    nsCOMPtr<nsIFile> file;
    nsresult rv = fileChannel->GetFile(getter_AddRefs(file));
    if (NS_SUCCEEDED(rv)) {
      int64_t filesize;
      rv = file->GetFileSize(&filesize);
      if (NS_SUCCEEDED(rv)) {
        return std::max(SaturateToInt32(filesize), 0);
      }
    }
  }

  // Fallback - neither http nor file. We'll use dynamic allocation.
  return 0;
}

/* static */
already_AddRefed<Image> ImageFactory::CreateRasterImage(
    nsIRequest* aRequest, ProgressTracker* aProgressTracker,
    const nsCString& aMimeType, nsIURI* aURI, uint32_t aImageFlags,
    uint64_t aInnerWindowId) {
  MOZ_ASSERT(aProgressTracker);

  nsresult rv;

  RefPtr<RasterImage> newImage = new RasterImage(aURI);
  aProgressTracker->SetImage(newImage);
  newImage->SetProgressTracker(aProgressTracker);

  rv = newImage->Init(aMimeType.get(), aImageFlags);
  if (NS_FAILED(rv)) {
    return BadImage("RasterImage::Init failed", newImage);
  }

  newImage->SetInnerWindowID(aInnerWindowId);

  rv = newImage->SetSourceSizeHint(GetContentSize(aRequest));
  if (NS_FAILED(rv)) {
    return BadImage("RasterImage::SetSourceSizeHint failed", newImage);
  }

  return newImage.forget();
}

/* static */
already_AddRefed<Image> ImageFactory::CreateVectorImage(
    nsIRequest* aRequest, ProgressTracker* aProgressTracker,
    const nsCString& aMimeType, nsIURI* aURI, uint32_t aImageFlags,
    uint64_t aInnerWindowId) {
  MOZ_ASSERT(aProgressTracker);

  nsresult rv;

  RefPtr<VectorImage> newImage = new VectorImage(aURI);
  aProgressTracker->SetImage(newImage);
  newImage->SetProgressTracker(aProgressTracker);

  rv = newImage->Init(aMimeType.get(), aImageFlags);
  if (NS_FAILED(rv)) {
    return BadImage("VectorImage::Init failed", newImage);
  }

  newImage->SetInnerWindowID(aInnerWindowId);

  rv = newImage->OnStartRequest(aRequest);
  if (NS_FAILED(rv)) {
    return BadImage("VectorImage::OnStartRequest failed", newImage);
  }

  return newImage.forget();
}

}  // 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.