author Morten Stenshorne <>
Tue, 09 Oct 2018 04:14:13 +0000
changeset 495959 13844f50ee32e17f513b7c1013c2348200e21b8c
parent 487308 22cb98ed738bcc1de2c1d04ee8837df80c05a193
child 505383 6f3709b3878117466168c40affa7bca0b60cf75b
permissions -rw-r--r--
Bug 1496274 [wpt PR 13345] - [LayoutNG] Correct clip-path reference box calculation., a=testonly Automatic update from web-platform-tests[LayoutNG] Correct clip-path reference box calculation. We used coordinates relatively to the line box, while we were expected by the caller to be relative to the containing block. Flipping for writing mode was bogus for NG (but needed by legacy), since NG uses truly physical coordinates. Hardened tests to contain a leading line and padding, and leading content on the first line of the clipped child. Bug: 641907 Change-Id: I2b1b9ff4ea92a6405fcdffcf139842458b46442f Cq-Include-Trybots: luci.chromium.try​:linux_layout_tests_layout_ng Reviewed-on: Reviewed-by: Koji Ishii <> Reviewed-by: Fredrik Söderquist <> Commit-Queue: Morten Stenshorne <> Cr-Commit-Position: refs/heads/master@{#596554} -- wpt-commits: e9a0828c85819340f721f121aac19ab8eefa3439 wpt-pr: 13345

/* -*- 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 */

#include "ImageCacheKey.h"

#include "mozilla/HashFunctions.h"
#include "mozilla/Move.h"
#include "nsContentUtils.h"
#include "nsICookieService.h"
#include "nsLayoutUtils.h"
#include "nsString.h"
#include "mozilla/AntiTrackingCommon.h"
#include "mozilla/dom/BlobURLProtocolHandler.h"
#include "mozilla/dom/File.h"
#include "mozilla/dom/ServiceWorkerManager.h"
#include "nsIDocument.h"
#include "nsPrintfCString.h"

namespace mozilla {

using namespace dom;

namespace image {

static Maybe<uint64_t>
BlobSerial(nsIURI* aURI)
  nsAutoCString spec;

  RefPtr<BlobImpl> blob;
  if (NS_SUCCEEDED(NS_GetBlobForBlobURISpec(spec, getter_AddRefs(blob))) &&
      blob) {
    return Some(blob->GetSerialNumber());

  return Nothing();

ImageCacheKey::ImageCacheKey(nsIURI* aURI,
                             const OriginAttributes& aAttrs,
                             nsIDocument* aDocument,
                             nsresult& aRv)
  : mURI(aURI)
  , mOriginAttributes(aAttrs)
  , mControlledDocument(GetSpecialCaseDocumentToken(aDocument, aURI))
  , mHash(0)
  , mIsChrome(false)
  if (SchemeIs("blob")) {
    mBlobSerial = BlobSerial(mURI);
  } else if (SchemeIs("chrome")) {
    mIsChrome = true;

  // Since we frequently call Hash() several times in a row on the same
  // ImageCacheKey, as an optimization we compute our hash once and store it.

  nsPrintfCString ptr("%p", mControlledDocument);
  nsAutoCString suffix;

  if (mBlobSerial) {
    aRv = mURI->GetRef(mBlobRef);
    mHash = HashGeneric(*mBlobSerial, HashString(mBlobRef));
  } else {
    nsAutoCString spec;
    aRv = mURI->GetSpec(spec);
    mHash = HashString(spec);

  mHash = AddToHash(mHash, HashString(suffix), HashString(ptr));

ImageCacheKey::ImageCacheKey(const ImageCacheKey& aOther)
  : mURI(aOther.mURI)
  , mBlobSerial(aOther.mBlobSerial)
  , mBlobRef(aOther.mBlobRef)
  , mOriginAttributes(aOther.mOriginAttributes)
  , mControlledDocument(aOther.mControlledDocument)
  , mHash(aOther.mHash)
  , mIsChrome(aOther.mIsChrome)
{ }

ImageCacheKey::ImageCacheKey(ImageCacheKey&& aOther)
  : mURI(std::move(aOther.mURI))
  , mBlobSerial(std::move(aOther.mBlobSerial))
  , mBlobRef(std::move(aOther.mBlobRef))
  , mOriginAttributes(aOther.mOriginAttributes)
  , mControlledDocument(aOther.mControlledDocument)
  , mHash(aOther.mHash)
  , mIsChrome(aOther.mIsChrome)
{ }

ImageCacheKey::operator==(const ImageCacheKey& aOther) const
  // Don't share the image cache between a controlled document and anything else.
  if (mControlledDocument != aOther.mControlledDocument) {
    return false;
  // The origin attributes always have to match.
  if (mOriginAttributes != aOther.mOriginAttributes) {
    return false;
  if (mBlobSerial || aOther.mBlobSerial) {
    // If at least one of us has a blob serial, just compare the blob serial and
    // the ref portion of the URIs.
    return mBlobSerial == aOther.mBlobSerial &&
           mBlobRef == aOther.mBlobRef;

  // For non-blob URIs, compare the URIs.
  bool equals = false;
  nsresult rv = mURI->Equals(aOther.mURI, &equals);
  return NS_SUCCEEDED(rv) && equals;

ImageCacheKey::SchemeIs(const char* aScheme)
  bool matches = false;
  return NS_SUCCEEDED(mURI->SchemeIs(aScheme, &matches)) && matches;

/* static */ void*
ImageCacheKey::GetSpecialCaseDocumentToken(nsIDocument* aDocument, nsIURI* aURI)
  // Cookie-averse documents can never have storage granted to them.  Since they
  // may not have inner windows, they would require special handling below, so
  // just bail out early here.
  if (!aDocument || aDocument->IsCookieAverse()) {
    return nullptr;

  // For controlled documents, we cast the pointer into a void* to avoid
  // dereferencing it (since we only use it for comparisons).
  RefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
  if (swm && aDocument->GetController().isSome()) {
    return aDocument;

  // If the window is 3rd party resource, let's see if first-party storage
  // access is granted for this image.
  if (nsContentUtils::IsTrackingResourceWindow(aDocument->GetInnerWindow())) {
    return nsContentUtils::StorageDisabledByAntiTracking(aDocument, aURI) ?
             aDocument : nullptr;

  // Another scenario is if this image is a 3rd party resource loaded by a
  // first party context. In this case, we should check if the nsIChannel has
  // been marked as tracking resource, but we don't have the channel yet at
  // this point.  The best approach here is to be conservative: if we are sure
  // that the permission is granted, let's return a nullptr. Otherwise, let's
  // make a unique image cache.
  if (!AntiTrackingCommon::MaybeIsFirstPartyStorageAccessGrantedFor(aDocument->GetInnerWindow(),
                                                                    aURI)) {
    return aDocument;

  return nullptr;

} // namespace image
} // namespace mozilla