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Bug 1348050 - Part 3: Mark channel as urgent-start for loading image. r=baku,mayhemer

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This part is mainly to mark the channel as urgent-start if src related
attributes in HTMLImageElement and HTMLInputElement is set and the channel is
open due to user interaction. Unfortunately, we cannot just check the event
state just after creating channel since some loading image tasks will be queue
and execute in stable state. Thus, I store the event state in elements and
pass it to the place where create the channel.

MozReview-Commit-ID: GBdAkPfVzsn
This commit is contained in:
Tom Tung
2017-04-25 09:17:38 +08:00
parent bb0f7ffe58
commit dc2648e8f2
13 changed files with 99 additions and 6 deletions
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45
dom/html/HTMLImageElement.cpp
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@@ -79,9 +79,11 @@ namespace dom {
class ImageLoadTask : public Runnable
{
public:
ImageLoadTask(HTMLImageElement *aElement, bool aAlwaysLoad)
ImageLoadTask(HTMLImageElement *aElement, bool aAlwaysLoad,
bool aUseUrgentStartForChannel)
: mElement(aElement)
, mAlwaysLoad(aAlwaysLoad)
, mUseUrgentStartForChannel(aUseUrgentStartForChannel)
{
mDocument = aElement->OwnerDoc();
mDocument->BlockOnload();
@@ -91,6 +93,7 @@ public:
{
if (mElement->mPendingImageLoadTask == this) {
mElement->mPendingImageLoadTask = nullptr;
mElement->mUseUrgentStartForChannel = mUseUrgentStartForChannel;
mElement->LoadSelectedImage(true, true, mAlwaysLoad);
}
mDocument->UnblockOnload(false);
@@ -106,6 +109,10 @@ private:
RefPtr<HTMLImageElement> mElement;
nsCOMPtr<nsIDocument> mDocument;
bool mAlwaysLoad;
// True if we want to set nsIClassOfService::UrgentStart to the channel to
// get the response ASAP for better user responsiveness.
bool mUseUrgentStartForChannel;
};
HTMLImageElement::HTMLImageElement(already_AddRefed<mozilla::dom::NodeInfo>& aNodeInfo)
@@ -410,6 +417,10 @@ HTMLImageElement::AfterSetAttr(int32_t aNameSpaceID, nsIAtom* aName,
if (aName == nsGkAtoms::src &&
aNameSpaceID == kNameSpaceID_None &&
!aValue) {
// Mark channel as urgent-start before load image if the image load is
// initaiated by a user interaction.
mUseUrgentStartForChannel = EventStateManager::IsHandlingUserInput();
// SetAttr handles setting src since it needs to catch img.src =
// img.src, so we only need to handle the unset case
if (InResponsiveMode()) {
@@ -424,9 +435,17 @@ HTMLImageElement::AfterSetAttr(int32_t aNameSpaceID, nsIAtom* aName,
}
} else if (aName == nsGkAtoms::srcset &&
aNameSpaceID == kNameSpaceID_None) {
// Mark channel as urgent-start before load image if the image load is
// initaiated by a user interaction.
mUseUrgentStartForChannel = EventStateManager::IsHandlingUserInput();
PictureSourceSrcsetChanged(this, attrVal.String(), aNotify);
} else if (aName == nsGkAtoms::sizes &&
aNameSpaceID == kNameSpaceID_None) {
// Mark channel as urgent-start before load image if the image load is
// initaiated by a user interaction.
mUseUrgentStartForChannel = EventStateManager::IsHandlingUserInput();
PictureSourceSizesChanged(this, attrVal.String(), aNotify);
}
@@ -505,6 +524,10 @@ HTMLImageElement::SetAttr(int32_t aNameSpaceID, nsIAtom* aName,
if (aNameSpaceID == kNameSpaceID_None &&
aName == nsGkAtoms::src) {
// Mark channel as urgent-start before load image if the image load is
// initaiated by a user interaction.
mUseUrgentStartForChannel = EventStateManager::IsHandlingUserInput();
if (InResponsiveMode()) {
if (mResponsiveSelector &&
mResponsiveSelector->Content() == this) {
@@ -562,6 +585,10 @@ HTMLImageElement::SetAttr(int32_t aNameSpaceID, nsIAtom* aName,
// reload after the attribute has been set if the reload is triggerred by
// cross origin changing.
if (forceReload) {
// Mark channel as urgent-start before load image if the image load is
// initaiated by a user interaction.
mUseUrgentStartForChannel = EventStateManager::IsHandlingUserInput();
if (InResponsiveMode()) {
// per spec, full selection runs when this changes, even though
// it doesn't directly affect the source selection
@@ -600,6 +627,10 @@ HTMLImageElement::BindToTree(nsIDocument* aDocument, nsIContent* aParent,
mInDocResponsiveContent = true;
}
// Mark channel as urgent-start before load image if the image load is
// initaiated by a user interaction.
mUseUrgentStartForChannel = EventStateManager::IsHandlingUserInput();
// Run selection algorithm when an img element is inserted into a document
// in order to react to changes in the environment. See note of
// https://html.spec.whatwg.org/multipage/embedded-content.html#img-environment-changes
@@ -612,6 +643,10 @@ HTMLImageElement::BindToTree(nsIDocument* aDocument, nsIContent* aParent,
// image load task is asynchronous we don't need to take special
// care to avoid doing so when being filled by the parser.
// Mark channel as urgent-start before load image if the image load is
// initaiated by a user interaction.
mUseUrgentStartForChannel = EventStateManager::IsHandlingUserInput();
// FIXME: Bug 660963 it would be nice if we could just have
// ClearBrokenState update our state and do it fast...
ClearBrokenState();
@@ -830,6 +865,10 @@ HTMLImageElement::CopyInnerTo(Element* aDest, bool aPreallocateChildren)
// reaches a stable state.
if (!dest->InResponsiveMode() &&
dest->HasAttr(kNameSpaceID_None, nsGkAtoms::src)) {
// Mark channel as urgent-start before load image if the image load is
// initaiated by a user interaction.
mUseUrgentStartForChannel = EventStateManager::IsHandlingUserInput();
nsContentUtils::AddScriptRunner(
NewRunnableMethod(dest, &HTMLImageElement::MaybeLoadImage));
}
@@ -913,7 +952,9 @@ HTMLImageElement::QueueImageLoadTask(bool aAlwaysLoad)
if (mPendingImageLoadTask) {
alwaysLoad = alwaysLoad || mPendingImageLoadTask->AlwaysLoad();
}
RefPtr<ImageLoadTask> task = new ImageLoadTask(this, alwaysLoad);
RefPtr<ImageLoadTask> task = new ImageLoadTask(this,
alwaysLoad,
mUseUrgentStartForChannel);
// The task checks this to determine if it was the last
// queued event, and so earlier tasks are implicitly canceled.
mPendingImageLoadTask = task;