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Bug 1356686 - Ensure that imgRequest::CheckListenerChain returns the correct value r=tnikkel

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SVGs must be coded on MainThread because they need to access the LoadGroup,
etc, while other images can be decoded via the decode pool.   This ensures
that CheckListenerChain() will return the right value for this instance.

Differential Revision: https://phabricator.services.mozilla.com/D203181
This commit is contained in:
Randell Jesup 2024-03-19 17:27:23 +00:00
parent 066055e41e
commit d542854faa
2 changed files with 9 additions and 8 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

15
image/imgRequest.cpp
View file

@ -711,16 +711,17 @@ imgRequest::OnStartRequest(nsIRequest* aRequest) {
nsAutoCString mimeType;
nsresult rv = channel->GetContentType(mimeType);
if (NS_SUCCEEDED(rv) && !mimeType.EqualsLiteral(IMAGE_SVG_XML)) {
mOffMainThreadData = true;
// Retarget OnDataAvailable to the DecodePool's IO thread.
nsCOMPtr<nsISerialEventTarget> target =
DecodePool::Singleton()->GetIOEventTarget();
rv = retargetable->RetargetDeliveryTo(target);
MOZ_LOG(gImgLog, LogLevel::Warning,
("[this=%p] imgRequest::OnStartRequest -- "
"RetargetDeliveryTo rv %" PRIu32 "=%s\n",
this, static_cast<uint32_t>(rv),
NS_SUCCEEDED(rv) ? "succeeded" : "failed"));
}
MOZ_LOG(gImgLog, LogLevel::Warning,
("[this=%p] imgRequest::OnStartRequest -- "
"RetargetDeliveryTo rv %" PRIu32 "=%s\n",
this, static_cast<uint32_t>(rv),
NS_SUCCEEDED(rv) ? "succeeded" : "failed"));
}
return NS_OK;
@ -834,9 +835,7 @@ static nsresult sniff_mimetype_callback(nsIInputStream* in, void* closure,
/** nsThreadRetargetableStreamListener methods **/
NS_IMETHODIMP
imgRequest::CheckListenerChain() {
// TODO Might need more checking here.
NS_ASSERTION(NS_IsMainThread(), "Should be on the main thread!");
return NS_OK;
return mOffMainThreadData ? NS_OK : NS_ERROR_NO_INTERFACE;
}
NS_IMETHODIMP

2
image/imgRequest.h
View file

@ -283,6 +283,8 @@ class imgRequest final : public nsIThreadRetargetableStreamListener,
bool mIsCrossSiteNoCORSRequest;
bool mShouldReportRenderTimeForLCP;
// SVGs can't be OffMainThread for example
bool mOffMainThreadData = false;
mutable mozilla::Mutex mMutex;