void
ServoRestyleManager::PostRestyleEvent(Element* aElement,
nsRestyleHint aRestyleHint,
nsChangeHint aMinChangeHint)
{
if (MOZ_UNLIKELY(IsDisconnected()) ||
MOZ_UNLIKELY(PresContext()->PresShell()->IsDestroying())) {
return;
}
if (aRestyleHint == 0 && !aMinChangeHint && !HasPendingRestyles()) {
return; // Nothing to do.
}
// XXX This is a temporary hack to make style attribute change works.
// In the future, we should be able to use this hint directly.
if (aRestyleHint & eRestyle_StyleAttribute) {
aRestyleHint |= eRestyle_Subtree;
}
// Note that unlike in Servo, we don't mark elements as dirty until we process
// the restyle hints in ProcessPendingRestyles.
if (aRestyleHint || aMinChangeHint) {
ServoElementSnapshot* snapshot = SnapshotForElement(aElement);
snapshot->AddExplicitRestyleHint(aRestyleHint);
snapshot->AddExplicitChangeHint(aMinChangeHint);
}
PostRestyleEventInternal(false);
}
void
ServoRestyleManager::PostRestyleEvent(Element* aElement,
nsRestyleHint aRestyleHint,
nsChangeHint aMinChangeHint)
{
if (MOZ_UNLIKELY(IsDisconnected()) ||
MOZ_UNLIKELY(PresContext()->PresShell()->IsDestroying())) {
return;
}
if (aRestyleHint == 0 && !aMinChangeHint && !HasPendingRestyles()) {
return; // Nothing to do.
}
// We allow posting change hints during restyling, but not restyle hints
// themselves, since those would require us to re-traverse the tree.
MOZ_ASSERT_IF(mInStyleRefresh, aRestyleHint == 0);
// Processing change hints sometimes causes new change hints to be generated.
// Doing this after the gecko post-traversal is problematic, so instead we just
// queue them up for special handling.
if (mReentrantChanges) {
MOZ_ASSERT(aRestyleHint == 0);
mReentrantChanges->AppendElement(ReentrantChange { aElement, aMinChangeHint });
return;
}
// XXX This is a temporary hack to make style attribute change works.
// In the future, we should be able to use this hint directly.
if (aRestyleHint & eRestyle_StyleAttribute) {
aRestyleHint &= ~eRestyle_StyleAttribute;
aRestyleHint |= eRestyle_Self | eRestyle_Subtree;
}
// XXX For now, convert eRestyle_Subtree into (eRestyle_Self |
// eRestyle_SomeDescendants), which Servo will interpret as
// RESTYLE_SELF | RESTYLE_DESCENDANTS, since this is a commonly
// posted restyle hint that doesn't yet align with RestyleHint's
// bits.
if (aRestyleHint & eRestyle_Subtree) {
aRestyleHint &= ~eRestyle_Subtree;
aRestyleHint |= eRestyle_Self | eRestyle_SomeDescendants;
}
if (aRestyleHint || aMinChangeHint) {
Servo_NoteExplicitHints(aElement, aRestyleHint, aMinChangeHint);
}
PostRestyleEventInternal(false);
}
void
ServoRestyleManager::PostRestyleEvent(Element* aElement,
nsRestyleHint aRestyleHint,
nsChangeHint aMinChangeHint)
{
if (MOZ_UNLIKELY(IsDisconnected()) ||
MOZ_UNLIKELY(PresContext()->PresShell()->IsDestroying())) {
return;
}
if (aRestyleHint == 0 && !aMinChangeHint && !HasPendingRestyles()) {
return; // Nothing to do.
}
// Note that unlike in Servo, we don't mark elements as dirty until we process
// the restyle hints in ProcessPendingRestyles.
if (aRestyleHint || aMinChangeHint) {
ServoElementSnapshot* snapshot = SnapshotForElement(aElement);
snapshot->AddExplicitRestyleHint(aRestyleHint);
snapshot->AddExplicitChangeHint(aMinChangeHint);
}
PostRestyleEventInternal(false);
}
void
ServoRestyleManager::ProcessPendingRestyles()
{
MOZ_ASSERT(PresContext()->Document(), "No document? Pshaw!");
MOZ_ASSERT(!nsContentUtils::IsSafeToRunScript(), "Missing a script blocker!");
if (MOZ_UNLIKELY(!PresContext()->PresShell()->DidInitialize())) {
// PresShell::FlushPendingNotifications doesn't early-return in the case
// where the PreShell hasn't yet been initialized (and therefore we haven't
// yet done the initial style traversal of the DOM tree). We should arguably
// fix up the callers and assert against this case, but we just detect and
// handle it for now.
return;
}
if (!HasPendingRestyles()) {
return;
}
ServoStyleSet* styleSet = StyleSet();
nsIDocument* doc = PresContext()->Document();
Element* root = doc->GetRootElement();
if (root) {
for (auto iter = mModifiedElements.Iter(); !iter.Done(); iter.Next()) {
ServoElementSnapshot* snapshot = iter.UserData();
Element* element = iter.Key();
// TODO: avoid the ComputeRestyleHint call if we already have the highest
// explicit restyle hint?
nsRestyleHint hint = styleSet->ComputeRestyleHint(element, snapshot);
hint |= snapshot->ExplicitRestyleHint();
if (hint) {
NoteRestyleHint(element, hint);
}
}
if (root->IsDirtyForServo() || root->HasDirtyDescendantsForServo()) {
mInStyleRefresh = true;
styleSet->StyleDocument(/* aLeaveDirtyBits = */ true);
// First do any queued-up frame creation. (see bugs 827239 and 997506).
//
// XXXEmilio I'm calling this to avoid random behavior changes, since we
// delay frame construction after styling we should re-check once our
// model is more stable whether we can skip this call.
//
// Note this has to be *after* restyling, because otherwise frame
// construction will find unstyled nodes, and that's not funny.
PresContext()->FrameConstructor()->CreateNeededFrames();
nsStyleChangeList changeList;
RecreateStyleContexts(root, nullptr, styleSet, changeList);
ProcessRestyledFrames(changeList);
mInStyleRefresh = false;
}
}
MOZ_ASSERT(!doc->IsDirtyForServo());
doc->UnsetHasDirtyDescendantsForServo();
mModifiedElements.Clear();
IncrementRestyleGeneration();
}
void
ServoRestyleManager::ProcessPendingRestyles()
{
MOZ_ASSERT(PresContext()->Document(), "No document? Pshaw!");
MOZ_ASSERT(!nsContentUtils::IsSafeToRunScript(), "Missing a script blocker!");
if (MOZ_UNLIKELY(!PresContext()->PresShell()->DidInitialize())) {
// PresShell::FlushPendingNotifications doesn't early-return in the case
// where the PreShell hasn't yet been initialized (and therefore we haven't
// yet done the initial style traversal of the DOM tree). We should arguably
// fix up the callers and assert against this case, but we just detect and
// handle it for now.
return;
}
if (!HasPendingRestyles()) {
return;
}
ServoStyleSet* styleSet = StyleSet();
nsIDocument* doc = PresContext()->Document();
// XXXbholley: Should this be while() per bug 1316247?
if (HasPendingRestyles()) {
mInStyleRefresh = true;
styleSet->StyleDocument();
// First do any queued-up frame creation. (see bugs 827239 and 997506).
//
// XXXEmilio I'm calling this to avoid random behavior changes, since we
// delay frame construction after styling we should re-check once our
// model is more stable whether we can skip this call.
//
// Note this has to be *after* restyling, because otherwise frame
// construction will find unstyled nodes, and that's not funny.
PresContext()->FrameConstructor()->CreateNeededFrames();
// Recreate style contexts and queue up change hints.
nsStyleChangeList currentChanges;
DocumentStyleRootIterator iter(doc);
while (Element* root = iter.GetNextStyleRoot()) {
RecreateStyleContexts(root, nullptr, styleSet, currentChanges);
}
// Process the change hints.
//
// Unfortunately, the frame constructor can generate new change hints while
// processing existing ones. We redirect those into a secondary queue and
// iterate until there's nothing left.
ReentrantChangeList newChanges;
mReentrantChanges = &newChanges;
while (!currentChanges.IsEmpty()) {
ProcessRestyledFrames(currentChanges);
MOZ_ASSERT(currentChanges.IsEmpty());
for (ReentrantChange& change: newChanges) {
currentChanges.AppendChange(change.mContent->GetPrimaryFrame(),
change.mContent, change.mHint);
}
newChanges.Clear();
}
mReentrantChanges = nullptr;
styleSet->AssertTreeIsClean();
mInStyleRefresh = false;
}
IncrementRestyleGeneration();
}