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Bug 996796 patch 22 - Make restyling exact - only call RestyleBeforePseudo and RestyleAfterPseudo when we have an eRestyle_Subtree hint. r=heycam

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This commit is contained in:
L. David Baron 2014-08-03 13:11:55 -07:00
parent 35090da319
commit 953073e82b
1 changed files with 16 additions and 2 deletions
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18
layout/base/RestyleManager.cpp
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@ -2671,6 +2671,20 @@ ElementRestyler::RestyleSelf(nsIFrame* aSelf, nsRestyleHint aRestyleHint)
void
ElementRestyler::RestyleChildren(nsRestyleHint aChildRestyleHint)
{
// We'd like style resolution to be exact in the sense that an
// animation-only style flush flushes only the styles it requests
// flushing and doesn't update any other styles. This means avoiding
// constructing new frames during such a flush.
//
// For a ::before or ::after, we'll do an eRestyle_Subtree due to
// RestyleHintForOp in nsCSSRuleProcessor.cpp (via its
// HasAttributeDependentStyle or HasStateDependentStyle), given that
// we store pseudo-elements in selectors like they were children.
//
// Also, it's faster to skip the work we do on undisplayed children
// and pseudo-elements when we can skip it.
bool mightReframePseudos = aChildRestyleHint & eRestyle_Subtree;
RestyleUndisplayedChildren(aChildRestyleHint);
// Check whether we might need to create a new ::before frame.
@ -2681,7 +2695,7 @@ ElementRestyler::RestyleChildren(nsRestyleHint aChildRestyleHint)
// ReconstructFrame hint. Using an out of date style context could
// trigger assertions about mismatched rule trees.
if (!(mHintsHandled & nsChangeHint_ReconstructFrame) &&
aChildRestyleHint) {
mightReframePseudos) {
RestyleBeforePseudo();
}
@ -2710,7 +2724,7 @@ ElementRestyler::RestyleChildren(nsRestyleHint aChildRestyleHint)
// Check whether we might need to create a new ::after frame.
// See comments above regarding :before.
if (!(mHintsHandled & nsChangeHint_ReconstructFrame) &&
aChildRestyleHint) {
mightReframePseudos) {
RestyleAfterPseudo(lastContinuation);
}
}