From deae241f5e3db8f9b86b98933291b9a30e28db22 Mon Sep 17 00:00:00 2001 From: win7-7 Date: Thu, 8 Aug 2019 16:44:51 +0300 Subject: Convert dom/base/nsImageLoadingContent.cpp to use AsyncOpen2 and followups along with it (1445670 and 1373780 part 2 and 3) Convert dom/base/nsImageLoadingContent.cpp to use AsyncOpen2 and followups along with it (1445670 and 1373780 part 2 and 3) --- dom/base/nsImageLoadingContent.cpp | 101 +++++++++++++++++++------------------ 1 file changed, 51 insertions(+), 50 deletions(-) (limited to 'dom/base/nsImageLoadingContent.cpp') diff --git a/dom/base/nsImageLoadingContent.cpp b/dom/base/nsImageLoadingContent.cpp index 0c6c37b44..4aad55941 100644 --- a/dom/base/nsImageLoadingContent.cpp +++ b/dom/base/nsImageLoadingContent.cpp @@ -44,6 +44,7 @@ #include "mozAutoDocUpdate.h" #include "mozilla/AsyncEventDispatcher.h" +#include "mozilla/AutoRestore.h" #include "mozilla/EventStates.h" #include "mozilla/dom/Element.h" #include "mozilla/dom/ImageTracker.h" @@ -94,7 +95,8 @@ nsImageLoadingContent::nsImageLoadingContent() mNewRequestsWillNeedAnimationReset(false), mStateChangerDepth(0), mCurrentRequestRegistered(false), - mPendingRequestRegistered(false) + mPendingRequestRegistered(false), + mIsStartingImageLoad(false) { if (!nsContentUtils::GetImgLoaderForChannel(nullptr, nullptr)) { mLoadingEnabled = false; @@ -785,6 +787,11 @@ nsImageLoadingContent::LoadImage(nsIURI* aNewURI, nsIDocument* aDocument, nsLoadFlags aLoadFlags) { + MOZ_ASSERT(!mIsStartingImageLoad, "some evil code is reentering LoadImage."); + if (mIsStartingImageLoad) { + return NS_OK; + } + // Pending load/error events need to be canceled in some situations. This // is not documented in the spec, but can cause site compat problems if not // done. See bug 1309461 and https://github.com/whatwg/html/issues/1872. @@ -814,6 +821,21 @@ nsImageLoadingContent::LoadImage(nsIURI* aNewURI, } } + AutoRestore guard(mIsStartingImageLoad); + mIsStartingImageLoad = true; + + // Data documents, or documents from DOMParser shouldn't perform image loading. + if (aDocument->IsLoadedAsData()) { + // This is the only codepath on which we can reach SetBlockedRequest while + // our pending request exists. Just clear it out here if we do have one. + ClearPendingRequest(NS_BINDING_ABORTED, + Some(OnNonvisible::DISCARD_IMAGES)); + SetBlockedRequest(nsIContentPolicy::REJECT_REQUEST); + FireEvent(NS_LITERAL_STRING("error")); + FireEvent(NS_LITERAL_STRING("loadend")); + return NS_OK; + } + // URI equality check. // // We skip the equality check if our current image was blocked, since in that @@ -844,23 +866,8 @@ nsImageLoadingContent::LoadImage(nsIURI* aNewURI, "Principal mismatch?"); #endif - // Are we blocked? - int16_t cpDecision = nsIContentPolicy::REJECT_REQUEST; nsContentPolicyType policyType = PolicyTypeForLoad(aImageLoadType); - nsContentUtils::CanLoadImage(aNewURI, - static_cast(this), - aDocument, - aDocument->NodePrincipal(), - &cpDecision, - policyType); - if (!NS_CP_ACCEPTED(cpDecision)) { - FireEvent(NS_LITERAL_STRING("error")); - FireEvent(NS_LITERAL_STRING("loadend")); - SetBlockedRequest(aNewURI, cpDecision); - return NS_OK; - } - nsLoadFlags loadFlags = aLoadFlags; int32_t corsmode = GetCORSMode(); if (corsmode == CORS_ANONYMOUS) { @@ -878,7 +885,6 @@ nsImageLoadingContent::LoadImage(nsIURI* aNewURI, referrerPolicy = imgReferrerPolicy; } - // Not blocked. Do the load. RefPtr& req = PrepareNextRequest(aImageLoadType); nsCOMPtr content = do_QueryInterface(static_cast(this)); @@ -932,7 +938,6 @@ nsImageLoadingContent::LoadImage(nsIURI* aNewURI, FireEvent(NS_LITERAL_STRING("error")); FireEvent(NS_LITERAL_STRING("loadend")); - return NS_OK; } return NS_OK; @@ -1212,46 +1217,42 @@ nsImageLoadingContent::PrepareNextRequest(ImageLoadType aImageLoadType) mMostRecentRequestChange = now; } - // If we don't have a usable current request, get rid of any half-baked - // request that might be sitting there and make this one current. - if (!HaveSize(mCurrentRequest)) - return PrepareCurrentRequest(aImageLoadType); - // Otherwise, make it pending. - return PreparePendingRequest(aImageLoadType); + // We only want to cancel the existing current request if size is not + // available. bz says the web depends on this behavior. + // Otherwise, we get rid of any half-baked request that might be sitting there + // and make this one current. + // TODO: Bug 583491 + // Investigate/Cleanup NS_ERROR_IMAGE_SRC_CHANGED use in nsImageFrame.cpp + return HaveSize(mCurrentRequest) ? + PreparePendingRequest(aImageLoadType) : + PrepareCurrentRequest(aImageLoadType); } -void -nsImageLoadingContent::SetBlockedRequest(nsIURI* aURI, int16_t aContentDecision) +nsresult +nsImageLoadingContent::SetBlockedRequest(int16_t aContentDecision) { + // If this is not calling from LoadImage, for example, from ServiceWorker, + // bail out. + if (!mIsStartingImageLoad) { + return NS_OK; + } + // Sanity MOZ_ASSERT(!NS_CP_ACCEPTED(aContentDecision), "Blocked but not?"); - // We do some slightly illogical stuff here to maintain consistency with - // old behavior that people probably depend on. Even in the case where the - // new image is blocked, the old one should really be canceled with the - // reason "image source changed". However, apparently there's some abuse - // over in nsImageFrame where the displaying of the "broken" icon for the - // next image depends on the cancel reason of the previous image. ugh. - // XXX(seth): So shouldn't we fix nsImageFrame?! - ClearPendingRequest(NS_ERROR_IMAGE_BLOCKED, - Some(OnNonvisible::DISCARD_IMAGES)); - - // For the blocked case, we only want to cancel the existing current request - // if size is not available. bz says the web depends on this behavior. - if (!HaveSize(mCurrentRequest)) { + // We should never have a pending request after we got blocked. + MOZ_ASSERT(!mPendingRequest, "mPendingRequest should be null."); + if (HaveSize(mCurrentRequest)) { + // PreparePendingRequest set mPendingRequestFlags, now since we've decided + // to block it, we reset it back to 0. + mPendingRequestFlags = 0; + } else { mImageBlockingStatus = aContentDecision; - uint32_t keepFlags = mCurrentRequestFlags & REQUEST_IS_IMAGESET; - ClearCurrentRequest(NS_ERROR_IMAGE_BLOCKED, - Some(OnNonvisible::DISCARD_IMAGES)); - - // We still want to remember what URI we were and if it was an imageset, - // despite not having an actual request. These are both cleared as part of - // ClearCurrentRequest() before a new request is started. - mCurrentURI = aURI; - mCurrentRequestFlags = keepFlags; } + + return NS_OK; } RefPtr& @@ -1262,7 +1263,7 @@ nsImageLoadingContent::PrepareCurrentRequest(ImageLoadType aImageLoadType) mImageBlockingStatus = nsIContentPolicy::ACCEPT; // Get rid of anything that was there previously. - ClearCurrentRequest(NS_ERROR_IMAGE_SRC_CHANGED, + ClearCurrentRequest(NS_BINDING_ABORTED, Some(OnNonvisible::DISCARD_IMAGES)); if (mNewRequestsWillNeedAnimationReset) { @@ -1281,7 +1282,7 @@ RefPtr& nsImageLoadingContent::PreparePendingRequest(ImageLoadType aImageLoadType) { // Get rid of anything that was there previously. - ClearPendingRequest(NS_ERROR_IMAGE_SRC_CHANGED, + ClearPendingRequest(NS_BINDING_ABORTED, Some(OnNonvisible::DISCARD_IMAGES)); if (mNewRequestsWillNeedAnimationReset) { -- cgit v1.2.3