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gecko-dev/layout/base/RestyleManager.cpp
L. David Baron 93048fc66f Bug 1353187 - Guard access to the frame property table with a frame state bit. r=dholbert 
This protects all accesses to the frame property table with a bit stored
on the frame.  This means we avoid hashtable operations when asking
about frame properties on frames that have no properties.

The changes to RestyleManager, and the new HasSkippingBitCheck API, are
needed because RestyleManager depended on being able to ask for
properties on a deleted frame (knowing that the property in question
could not have been set on any new frames since the deleted frame was
destroyed), in order to use the destruction of the properties that
happens at frame destruction as a mechanism for learning that the frame
was destroyed.  The changes there preserve the use of that mechanism,
although it becomes a bit uglier.  The ugliness is well-deserved.

MozReview-Commit-ID: BScmDUlWq65

--HG--
extra : transplant_source : %C8%C0%CD%DC%12g%5B%8ER%3A%FF%A7a%F8%91%D4%2C%9BF%2B
2017-04-04 20:59:21 -07:00

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "mozilla/RestyleManager.h"
#include "mozilla/RestyleManagerInlines.h"
#include "mozilla/StyleSetHandleInlines.h"
#include "nsIFrame.h"
#include "nsIPresShellInlines.h"
namespace mozilla {
RestyleManager::RestyleManager(StyleBackendType aType,
nsPresContext* aPresContext)
: mPresContext(aPresContext)
, mRestyleGeneration(1)
, mHoverGeneration(0)
, mType(aType)
, mInStyleRefresh(false)
{
MOZ_ASSERT(mPresContext);
}
void
RestyleManager::ContentInserted(nsINode* aContainer, nsIContent* aChild)
{
RestyleForInsertOrChange(aContainer, aChild);
}
void
RestyleManager::ContentAppended(nsIContent* aContainer, nsIContent* aFirstNewContent)
{
RestyleForAppend(aContainer, aFirstNewContent);
}
void
RestyleManager::RestyleForEmptyChange(Element* aContainer)
{
// In some cases (:empty + E, :empty ~ E), a change in the content of
// an element requires restyling its parent's siblings.
nsRestyleHint hint = eRestyle_Subtree;
nsIContent* grandparent = aContainer->GetParent();
if (grandparent &&
(grandparent->GetFlags() & NODE_HAS_SLOW_SELECTOR_LATER_SIBLINGS)) {
hint = nsRestyleHint(hint | eRestyle_LaterSiblings);
}
PostRestyleEvent(aContainer, hint, nsChangeHint(0));
}
void
RestyleManager::RestyleForAppend(nsIContent* aContainer,
nsIContent* aFirstNewContent)
{
// The container cannot be a document, but might be a ShadowRoot.
if (!aContainer->IsElement()) {
return;
}
Element* container = aContainer->AsElement();
#ifdef DEBUG
{
for (nsIContent* cur = aFirstNewContent; cur; cur = cur->GetNextSibling()) {
NS_ASSERTION(!cur->IsRootOfAnonymousSubtree(),
"anonymous nodes should not be in child lists");
}
}
#endif
uint32_t selectorFlags =
container->GetFlags() & (NODE_ALL_SELECTOR_FLAGS &
~NODE_HAS_SLOW_SELECTOR_LATER_SIBLINGS);
if (selectorFlags == 0)
return;
if (selectorFlags & NODE_HAS_EMPTY_SELECTOR) {
// see whether we need to restyle the container
bool wasEmpty = true; // :empty or :-moz-only-whitespace
for (nsIContent* cur = container->GetFirstChild();
cur != aFirstNewContent;
cur = cur->GetNextSibling()) {
// We don't know whether we're testing :empty or :-moz-only-whitespace,
// so be conservative and assume :-moz-only-whitespace (i.e., make
// IsSignificantChild less likely to be true, and thus make us more
// likely to restyle).
if (nsStyleUtil::IsSignificantChild(cur, true, false)) {
wasEmpty = false;
break;
}
}
if (wasEmpty) {
RestyleForEmptyChange(container);
return;
}
}
if (selectorFlags & NODE_HAS_SLOW_SELECTOR) {
PostRestyleEvent(container, eRestyle_Subtree, nsChangeHint(0));
// Restyling the container is the most we can do here, so we're done.
return;
}
if (selectorFlags & NODE_HAS_EDGE_CHILD_SELECTOR) {
// restyle the last element child before this node
for (nsIContent* cur = aFirstNewContent->GetPreviousSibling();
cur;
cur = cur->GetPreviousSibling()) {
if (cur->IsElement()) {
PostRestyleEvent(cur->AsElement(), eRestyle_Subtree, nsChangeHint(0));
break;
}
}
}
}
// Needed since we can't use PostRestyleEvent on non-elements (with
// eRestyle_LaterSiblings or nsRestyleHint(eRestyle_Subtree |
// eRestyle_LaterSiblings) as appropriate).
static void
RestyleSiblingsStartingWith(RestyleManager* aRestyleManager,
nsIContent* aStartingSibling /* may be null */)
{
for (nsIContent* sibling = aStartingSibling; sibling;
sibling = sibling->GetNextSibling()) {
if (sibling->IsElement()) {
aRestyleManager->
PostRestyleEvent(sibling->AsElement(),
nsRestyleHint(eRestyle_Subtree | eRestyle_LaterSiblings),
nsChangeHint(0));
break;
}
}
}
// Restyling for a ContentInserted or CharacterDataChanged notification.
// This could be used for ContentRemoved as well if we got the
// notification before the removal happened (and sometimes
// CharacterDataChanged is more like a removal than an addition).
// The comments are written and variables are named in terms of it being
// a ContentInserted notification.
void
RestyleManager::RestyleForInsertOrChange(nsINode* aContainer,
nsIContent* aChild)
{
// The container might be a document or a ShadowRoot.
if (!aContainer->IsElement()) {
return;
}
Element* container = aContainer->AsElement();
NS_ASSERTION(!aChild->IsRootOfAnonymousSubtree(),
"anonymous nodes should not be in child lists");
uint32_t selectorFlags =
container ? (container->GetFlags() & NODE_ALL_SELECTOR_FLAGS) : 0;
if (selectorFlags == 0)
return;
if (selectorFlags & NODE_HAS_EMPTY_SELECTOR) {
// see whether we need to restyle the container
bool wasEmpty = true; // :empty or :-moz-only-whitespace
for (nsIContent* child = container->GetFirstChild();
child;
child = child->GetNextSibling()) {
if (child == aChild)
continue;
// We don't know whether we're testing :empty or :-moz-only-whitespace,
// so be conservative and assume :-moz-only-whitespace (i.e., make
// IsSignificantChild less likely to be true, and thus make us more
// likely to restyle).
if (nsStyleUtil::IsSignificantChild(child, true, false)) {
wasEmpty = false;
break;
}
}
if (wasEmpty) {
RestyleForEmptyChange(container);
return;
}
}
if (selectorFlags & NODE_HAS_SLOW_SELECTOR) {
PostRestyleEvent(container, eRestyle_Subtree, nsChangeHint(0));
// Restyling the container is the most we can do here, so we're done.
return;
}
if (selectorFlags & NODE_HAS_SLOW_SELECTOR_LATER_SIBLINGS) {
// Restyle all later siblings.
RestyleSiblingsStartingWith(this, aChild->GetNextSibling());
}
if (selectorFlags & NODE_HAS_EDGE_CHILD_SELECTOR) {
// restyle the previously-first element child if it is after this node
bool passedChild = false;
for (nsIContent* content = container->GetFirstChild();
content;
content = content->GetNextSibling()) {
if (content == aChild) {
passedChild = true;
continue;
}
if (content->IsElement()) {
if (passedChild) {
PostRestyleEvent(content->AsElement(), eRestyle_Subtree,
nsChangeHint(0));
}
break;
}
}
// restyle the previously-last element child if it is before this node
passedChild = false;
for (nsIContent* content = container->GetLastChild();
content;
content = content->GetPreviousSibling()) {
if (content == aChild) {
passedChild = true;
continue;
}
if (content->IsElement()) {
if (passedChild) {
PostRestyleEvent(content->AsElement(), eRestyle_Subtree,
nsChangeHint(0));
}
break;
}
}
}
}
void
RestyleManager::ContentRemoved(nsINode* aContainer,
nsIContent* aOldChild,
nsIContent* aFollowingSibling)
{
// The container might be a document or a ShadowRoot.
if (!aContainer->IsElement()) {
return;
}
Element* container = aContainer->AsElement();
if (aOldChild->IsRootOfAnonymousSubtree()) {
// This should be an assert, but this is called incorrectly in
// HTMLEditor::DeleteRefToAnonymousNode and the assertions were clogging
// up the logs. Make it an assert again when that's fixed.
MOZ_ASSERT(aOldChild->GetProperty(nsGkAtoms::restylableAnonymousNode),
"anonymous nodes should not be in child lists (bug 439258)");
}
uint32_t selectorFlags =
container ? (container->GetFlags() & NODE_ALL_SELECTOR_FLAGS) : 0;
if (selectorFlags == 0)
return;
if (selectorFlags & NODE_HAS_EMPTY_SELECTOR) {
// see whether we need to restyle the container
bool isEmpty = true; // :empty or :-moz-only-whitespace
for (nsIContent* child = container->GetFirstChild();
child;
child = child->GetNextSibling()) {
// We don't know whether we're testing :empty or :-moz-only-whitespace,
// so be conservative and assume :-moz-only-whitespace (i.e., make
// IsSignificantChild less likely to be true, and thus make us more
// likely to restyle).
if (nsStyleUtil::IsSignificantChild(child, true, false)) {
isEmpty = false;
break;
}
}
if (isEmpty) {
RestyleForEmptyChange(container);
return;
}
}
if (selectorFlags & NODE_HAS_SLOW_SELECTOR) {
PostRestyleEvent(container, eRestyle_Subtree, nsChangeHint(0));
// Restyling the container is the most we can do here, so we're done.
return;
}
if (selectorFlags & NODE_HAS_SLOW_SELECTOR_LATER_SIBLINGS) {
// Restyle all later siblings.
RestyleSiblingsStartingWith(this, aFollowingSibling);
}
if (selectorFlags & NODE_HAS_EDGE_CHILD_SELECTOR) {
// restyle the now-first element child if it was after aOldChild
bool reachedFollowingSibling = false;
for (nsIContent* content = container->GetFirstChild();
content;
content = content->GetNextSibling()) {
if (content == aFollowingSibling) {
reachedFollowingSibling = true;
// do NOT continue here; we might want to restyle this node
}
if (content->IsElement()) {
if (reachedFollowingSibling) {
PostRestyleEvent(content->AsElement(), eRestyle_Subtree,
nsChangeHint(0));
}
break;
}
}
// restyle the now-last element child if it was before aOldChild
reachedFollowingSibling = (aFollowingSibling == nullptr);
for (nsIContent* content = container->GetLastChild();
content;
content = content->GetPreviousSibling()) {
if (content->IsElement()) {
if (reachedFollowingSibling) {
PostRestyleEvent(content->AsElement(), eRestyle_Subtree, nsChangeHint(0));
}
break;
}
if (content == aFollowingSibling) {
reachedFollowingSibling = true;
}
}
}
}
/**
* Calculates the change hint and the restyle hint for a given content state
* change.
*
* This is called from both Restyle managers.
*/
void
RestyleManager::ContentStateChangedInternal(Element* aElement,
EventStates aStateMask,
nsChangeHint* aOutChangeHint,
nsRestyleHint* aOutRestyleHint)
{
MOZ_ASSERT(aOutChangeHint);
MOZ_ASSERT(aOutRestyleHint);
StyleSetHandle styleSet = PresContext()->StyleSet();
NS_ASSERTION(styleSet, "couldn't get style set");
*aOutChangeHint = nsChangeHint(0);
// Any change to a content state that affects which frames we construct
// must lead to a frame reconstruct here if we already have a frame.
// Note that we never decide through non-CSS means to not create frames
// based on content states, so if we already don't have a frame we don't
// need to force a reframe -- if it's needed, the HasStateDependentStyle
// call will handle things.
nsIFrame* primaryFrame = aElement->GetPrimaryFrame();
CSSPseudoElementType pseudoType = CSSPseudoElementType::NotPseudo;
if (primaryFrame) {
// If it's generated content, ignore LOADING/etc state changes on it.
if (!primaryFrame->IsGeneratedContentFrame() &&
aStateMask.HasAtLeastOneOfStates(NS_EVENT_STATE_BROKEN |
NS_EVENT_STATE_USERDISABLED |
NS_EVENT_STATE_SUPPRESSED |
NS_EVENT_STATE_LOADING)) {
*aOutChangeHint = nsChangeHint_ReconstructFrame;
} else {
uint8_t app = primaryFrame->StyleDisplay()->UsedAppearance();
if (app) {
nsITheme* theme = PresContext()->GetTheme();
if (theme &&
theme->ThemeSupportsWidget(PresContext(), primaryFrame, app)) {
bool repaint = false;
theme->WidgetStateChanged(primaryFrame, app, nullptr, &repaint,
nullptr);
if (repaint) {
*aOutChangeHint |= nsChangeHint_RepaintFrame;
}
}
}
}
pseudoType = primaryFrame->StyleContext()->GetPseudoType();
primaryFrame->ContentStatesChanged(aStateMask);
}
if (pseudoType >= CSSPseudoElementType::Count) {
*aOutRestyleHint = styleSet->HasStateDependentStyle(aElement, aStateMask);
} else if (nsCSSPseudoElements::PseudoElementSupportsUserActionState(
pseudoType)) {
// If aElement is a pseudo-element, we want to check to see whether there
// are any state-dependent rules applying to that pseudo.
Element* ancestor =
ElementForStyleContext(nullptr, primaryFrame, pseudoType);
*aOutRestyleHint = styleSet->HasStateDependentStyle(ancestor, pseudoType,
aElement, aStateMask);
} else {
*aOutRestyleHint = nsRestyleHint(0);
}
if (aStateMask.HasState(NS_EVENT_STATE_HOVER) && *aOutRestyleHint != 0) {
IncrementHoverGeneration();
}
if (aStateMask.HasState(NS_EVENT_STATE_VISITED)) {
// Exposing information to the page about whether the link is
// visited or not isn't really something we can worry about here.
// FIXME: We could probably do this a bit better.
*aOutChangeHint |= nsChangeHint_RepaintFrame;
}
}
/* static */ nsCString
RestyleManager::RestyleHintToString(nsRestyleHint aHint)
{
nsCString result;
bool any = false;
const char* names[] = {
"Self", "SomeDescendants", "Subtree", "LaterSiblings", "CSSTransitions",
"CSSAnimations", "StyleAttribute", "StyleAttribute_Animations",
"Force", "ForceDescendants"
};
uint32_t hint = aHint & ((1 << ArrayLength(names)) - 1);
uint32_t rest = aHint & ~((1 << ArrayLength(names)) - 1);
for (uint32_t i = 0; i < ArrayLength(names); i++) {
if (hint & (1 << i)) {
if (any) {
result.AppendLiteral(" | ");
}
result.AppendPrintf("eRestyle_%s", names[i]);
any = true;
}
}
if (rest) {
if (any) {
result.AppendLiteral(" | ");
}
result.AppendPrintf("0x%0x", rest);
} else {
if (!any) {
result.AppendLiteral("0");
}
}
return result;
}
#ifdef DEBUG
/* static */ nsCString
RestyleManager::ChangeHintToString(nsChangeHint aHint)
{
nsCString result;
bool any = false;
const char* names[] = {
"RepaintFrame", "NeedReflow", "ClearAncestorIntrinsics",
"ClearDescendantIntrinsics", "NeedDirtyReflow", "SyncFrameView",
"UpdateCursor", "UpdateEffects", "UpdateOpacityLayer",
"UpdateTransformLayer", "ReconstructFrame", "UpdateOverflow",
"UpdateSubtreeOverflow", "UpdatePostTransformOverflow",
"UpdateParentOverflow",
"ChildrenOnlyTransform", "RecomputePosition", "UpdateContainingBlock",
"BorderStyleNoneChange", "UpdateTextPath", "SchedulePaint",
"NeutralChange", "InvalidateRenderingObservers",
"ReflowChangesSizeOrPosition", "UpdateComputedBSize",
"UpdateUsesOpacity", "UpdateBackgroundPosition",
"AddOrRemoveTransform"
};
static_assert(nsChangeHint_AllHints == (1 << ArrayLength(names)) - 1,
"Name list doesn't match change hints.");
uint32_t hint = aHint & ((1 << ArrayLength(names)) - 1);
uint32_t rest = aHint & ~((1 << ArrayLength(names)) - 1);
if ((hint & NS_STYLE_HINT_REFLOW) == NS_STYLE_HINT_REFLOW) {
result.AppendLiteral("NS_STYLE_HINT_REFLOW");
hint = hint & ~NS_STYLE_HINT_REFLOW;
any = true;
} else if ((hint & nsChangeHint_AllReflowHints) == nsChangeHint_AllReflowHints) {
result.AppendLiteral("nsChangeHint_AllReflowHints");
hint = hint & ~nsChangeHint_AllReflowHints;
any = true;
} else if ((hint & NS_STYLE_HINT_VISUAL) == NS_STYLE_HINT_VISUAL) {
result.AppendLiteral("NS_STYLE_HINT_VISUAL");
hint = hint & ~NS_STYLE_HINT_VISUAL;
any = true;
}
for (uint32_t i = 0; i < ArrayLength(names); i++) {
if (hint & (1 << i)) {
if (any) {
result.AppendLiteral(" | ");
}
result.AppendPrintf("nsChangeHint_%s", names[i]);
any = true;
}
}
if (rest) {
if (any) {
result.AppendLiteral(" | ");
}
result.AppendPrintf("0x%0x", rest);
} else {
if (!any) {
result.AppendLiteral("nsChangeHint(0)");
}
}
return result;
}
#endif
/**
* Frame construction helpers follow.
*/
#ifdef DEBUG
static bool gInApplyRenderingChangeToTree = false;
#endif
#ifdef DEBUG
static void
DumpContext(nsIFrame* aFrame, nsStyleContext* aContext)
{
if (aFrame) {
fputs("frame: ", stdout);
nsAutoString name;
aFrame->GetFrameName(name);
fputs(NS_LossyConvertUTF16toASCII(name).get(), stdout);
fprintf(stdout, " (%p)", static_cast<void*>(aFrame));
}
if (aContext) {
fprintf(stdout, " style: %p ", static_cast<void*>(aContext));
nsIAtom* pseudoTag = aContext->GetPseudo();
if (pseudoTag) {
nsAutoString buffer;
pseudoTag->ToString(buffer);
fputs(NS_LossyConvertUTF16toASCII(buffer).get(), stdout);
fputs(" ", stdout);
}
fputs("{}\n", stdout);
}
}
static void
VerifySameTree(nsStyleContext* aContext1, nsStyleContext* aContext2)
{
nsStyleContext* top1 = aContext1;
nsStyleContext* top2 = aContext2;
nsStyleContext* parent;
for (;;) {
parent = top1->GetParent();
if (!parent)
break;
top1 = parent;
}
for (;;) {
parent = top2->GetParent();
if (!parent)
break;
top2 = parent;
}
NS_ASSERTION(top1 == top2,
"Style contexts are not in the same style context tree");
}
static void
VerifyContextParent(nsIFrame* aFrame, nsStyleContext* aContext,
nsStyleContext* aParentContext)
{
// get the contexts not provided
if (!aContext) {
aContext = aFrame->StyleContext();
}
if (!aParentContext) {
nsIFrame* providerFrame;
aParentContext = aFrame->GetParentStyleContext(&providerFrame);
// aParentContext could still be null
}
NS_ASSERTION(aContext, "Failure to get required contexts");
nsStyleContext* actualParentContext = aContext->GetParent();
if (aParentContext) {
if (aParentContext != actualParentContext) {
DumpContext(aFrame, aContext);
if (aContext == aParentContext) {
NS_ERROR("Using parent's style context");
} else {
NS_ERROR("Wrong parent style context");
fputs("Wrong parent style context: ", stdout);
DumpContext(nullptr, actualParentContext);
fputs("should be using: ", stdout);
DumpContext(nullptr, aParentContext);
VerifySameTree(actualParentContext, aParentContext);
fputs("\n", stdout);
}
}
} else {
if (actualParentContext) {
NS_ERROR("Have parent context and shouldn't");
DumpContext(aFrame, aContext);
fputs("Has parent context: ", stdout);
DumpContext(nullptr, actualParentContext);
fputs("Should be null\n\n", stdout);
}
}
nsStyleContext* childStyleIfVisited = aContext->GetStyleIfVisited();
// Either childStyleIfVisited has aContext->GetParent()->GetStyleIfVisited()
// as the parent or it has a different rulenode from aContext _and_ has
// aContext->GetParent() as the parent.
if (childStyleIfVisited &&
!((childStyleIfVisited->RuleNode() != aContext->RuleNode() &&
childStyleIfVisited->GetParent() == aContext->GetParent()) ||
childStyleIfVisited->GetParent() ==
aContext->GetParent()->GetStyleIfVisited())) {
NS_ERROR("Visited style has wrong parent");
DumpContext(aFrame, aContext);
fputs("\n", stdout);
}
}
static void
VerifyStyleTree(nsIFrame* aFrame)
{
nsStyleContext* context = aFrame->StyleContext();
VerifyContextParent(aFrame, context, nullptr);
nsIFrame::ChildListIterator lists(aFrame);
for (; !lists.IsDone(); lists.Next()) {
for (nsIFrame* child : lists.CurrentList()) {
if (!(child->GetStateBits() & NS_FRAME_OUT_OF_FLOW)) {
// only do frames that are in flow
if (nsGkAtoms::placeholderFrame == child->GetType()) {
// placeholder: first recurse and verify the out of flow frame,
// then verify the placeholder's context
nsIFrame* outOfFlowFrame =
nsPlaceholderFrame::GetRealFrameForPlaceholder(child);
// recurse to out of flow frame, letting the parent context get resolved
do {
VerifyStyleTree(outOfFlowFrame);
} while ((outOfFlowFrame = outOfFlowFrame->GetNextContinuation()));
// verify placeholder using the parent frame's context as
// parent context
VerifyContextParent(child, nullptr, nullptr);
} else { // regular frame
VerifyStyleTree(child);
}
}
}
}
// do additional contexts
int32_t contextIndex = 0;
for (nsStyleContext* extraContext;
(extraContext = aFrame->GetAdditionalStyleContext(contextIndex));
++contextIndex) {
VerifyContextParent(aFrame, extraContext, context);
}
}
void
RestyleManager::DebugVerifyStyleTree(nsIFrame* aFrame)
{
if (IsServo()) {
// XXXheycam For now, we know that we don't use the same inheritance
// hierarchy for certain cases, so just skip these assertions until
// we work out what we want to assert (bug 1322570).
return;
}
if (aFrame) {
VerifyStyleTree(aFrame);
}
}
#endif // DEBUG
NS_DECLARE_FRAME_PROPERTY_SMALL_VALUE(ChangeListProperty, bool)
/**
* Sync views on aFrame and all of aFrame's descendants (following placeholders),
* if aChange has nsChangeHint_SyncFrameView.
* Calls DoApplyRenderingChangeToTree on all aFrame's out-of-flow descendants
* (following placeholders), if aChange has nsChangeHint_RepaintFrame.
* aFrame should be some combination of nsChangeHint_SyncFrameView,
* nsChangeHint_RepaintFrame, nsChangeHint_UpdateOpacityLayer and
* nsChangeHint_SchedulePaint, nothing else.
*/
static void SyncViewsAndInvalidateDescendants(nsIFrame* aFrame,
nsChangeHint aChange);
static void StyleChangeReflow(nsIFrame* aFrame, nsChangeHint aHint);
/**
* To handle nsChangeHint_ChildrenOnlyTransform we must iterate over the child
* frames of the SVG frame concerned. This helper function is used to find that
* SVG frame when we encounter nsChangeHint_ChildrenOnlyTransform to ensure
* that we iterate over the intended children, since sometimes we end up
* handling that hint while processing hints for one of the SVG frame's
* ancestor frames.
*
* The reason that we sometimes end up trying to process the hint for an
* ancestor of the SVG frame that the hint is intended for is due to the way we
* process restyle events. ApplyRenderingChangeToTree adjusts the frame from
* the restyled element's principle frame to one of its ancestor frames based
* on what nsCSSRendering::FindBackground returns, since the background style
* may have been propagated up to an ancestor frame. Processing hints using an
* ancestor frame is fine in general, but nsChangeHint_ChildrenOnlyTransform is
* a special case since it is intended to update the children of a specific
* frame.
*/
static nsIFrame*
GetFrameForChildrenOnlyTransformHint(nsIFrame* aFrame)
{
if (aFrame->GetType() == nsGkAtoms::viewportFrame) {
// This happens if the root-<svg> is fixed positioned, in which case we
// can't use aFrame->GetContent() to find the primary frame, since
// GetContent() returns nullptr for ViewportFrame.
aFrame = aFrame->PrincipalChildList().FirstChild();
}
// For an nsHTMLScrollFrame, this will get the SVG frame that has the
// children-only transforms:
aFrame = aFrame->GetContent()->GetPrimaryFrame();
if (aFrame->GetType() == nsGkAtoms::svgOuterSVGFrame) {
aFrame = aFrame->PrincipalChildList().FirstChild();
MOZ_ASSERT(aFrame->GetType() == nsGkAtoms::svgOuterSVGAnonChildFrame,
"Where is the nsSVGOuterSVGFrame's anon child??");
}
MOZ_ASSERT(aFrame->IsFrameOfType(nsIFrame::eSVG | nsIFrame::eSVGContainer),
"Children-only transforms only expected on SVG frames");
return aFrame;
}
// Returns true if this function managed to successfully move a frame, and
// false if it could not process the position change, and a reflow should
// be performed instead.
bool
RecomputePosition(nsIFrame* aFrame)
{
// Don't process position changes on table frames, since we already handle
// the dynamic position change on the table wrapper frame, and the
// reflow-based fallback code path also ignores positions on inner table
// frames.
if (aFrame->GetType() == nsGkAtoms::tableFrame) {
return true;
}
const nsStyleDisplay* display = aFrame->StyleDisplay();
// Changes to the offsets of a non-positioned element can safely be ignored.
if (display->mPosition == NS_STYLE_POSITION_STATIC) {
return true;
}
// Don't process position changes on frames which have views or the ones which
// have a view somewhere in their descendants, because the corresponding view
// needs to be repositioned properly as well.
if (aFrame->HasView() ||
(aFrame->GetStateBits() & NS_FRAME_HAS_CHILD_WITH_VIEW)) {
StyleChangeReflow(aFrame, nsChangeHint_NeedReflow);
return false;
}
aFrame->SchedulePaint();
// For relative positioning, we can simply update the frame rect
if (display->IsRelativelyPositionedStyle()) {
// Move the frame
if (display->mPosition == NS_STYLE_POSITION_STICKY) {
if (display->IsInnerTableStyle()) {
// We don't currently support sticky positioning of inner table
// elements (bug 975644). Bail.
//
// When this is fixed, remove the null-check for the computed
// offsets in nsTableRowFrame::ReflowChildren.
return true;
}
// Update sticky positioning for an entire element at once, starting with
// the first continuation or ib-split sibling.
// It's rare that the frame we already have isn't already the first
// continuation or ib-split sibling, but it can happen when styles differ
// across continuations such as ::first-line or ::first-letter, and in
// those cases we will generally (but maybe not always) do the work twice.
nsIFrame* firstContinuation =
nsLayoutUtils::FirstContinuationOrIBSplitSibling(aFrame);
StickyScrollContainer::ComputeStickyOffsets(firstContinuation);
StickyScrollContainer* ssc =
StickyScrollContainer::GetStickyScrollContainerForFrame(
firstContinuation);
if (ssc) {
ssc->PositionContinuations(firstContinuation);
}
} else {
MOZ_ASSERT(NS_STYLE_POSITION_RELATIVE == display->mPosition,
"Unexpected type of positioning");
for (nsIFrame* cont = aFrame; cont;
cont = nsLayoutUtils::GetNextContinuationOrIBSplitSibling(cont)) {
nsIFrame* cb = cont->GetContainingBlock();
nsMargin newOffsets;
WritingMode wm = cb->GetWritingMode();
const LogicalSize size(wm, cb->GetContentRectRelativeToSelf().Size());
ReflowInput::ComputeRelativeOffsets(wm, cont, size, newOffsets);
NS_ASSERTION(newOffsets.left == -newOffsets.right &&
newOffsets.top == -newOffsets.bottom,
"ComputeRelativeOffsets should return valid results");
// ReflowInput::ApplyRelativePositioning would work here, but
// since we've already checked mPosition and aren't changing the frame's
// normal position, go ahead and add the offsets directly.
// First, we need to ensure that the normal position is stored though.
nsPoint normalPosition = cont->GetNormalPosition();
auto props = cont->Properties();
const auto& prop = nsIFrame::NormalPositionProperty();
if (!props.Get(prop)) {
props.Set(prop, new nsPoint(normalPosition));
}
cont->SetPosition(normalPosition +
nsPoint(newOffsets.left, newOffsets.top));
}
}
return true;
}
// For the absolute positioning case, set up a fake HTML reflow state for
// the frame, and then get the offsets and size from it. If the frame's size
// doesn't need to change, we can simply update the frame position. Otherwise
// we fall back to a reflow.
nsRenderingContext rc(
aFrame->PresContext()->PresShell()->CreateReferenceRenderingContext());
// Construct a bogus parent reflow state so that there's a usable
// containing block reflow state.
nsIFrame* parentFrame = aFrame->GetParent();
WritingMode parentWM = parentFrame->GetWritingMode();
WritingMode frameWM = aFrame->GetWritingMode();
LogicalSize parentSize = parentFrame->GetLogicalSize();
nsFrameState savedState = parentFrame->GetStateBits();
ReflowInput parentReflowInput(aFrame->PresContext(), parentFrame, &rc,
parentSize);
parentFrame->RemoveStateBits(~nsFrameState(0));
parentFrame->AddStateBits(savedState);
// The bogus parent state here was created with no parent state of its own,
// and therefore it won't have an mCBReflowInput set up.
// But we may need one (for InitCBReflowInput in a child state), so let's
// try to create one here for the cases where it will be needed.
Maybe<ReflowInput> cbReflowInput;
nsIFrame* cbFrame = parentFrame->GetContainingBlock();
if (cbFrame && (aFrame->GetContainingBlock() != parentFrame ||
parentFrame->GetType() == nsGkAtoms::tableFrame)) {
LogicalSize cbSize = cbFrame->GetLogicalSize();
cbReflowInput.emplace(cbFrame->PresContext(), cbFrame, &rc, cbSize);
cbReflowInput->ComputedPhysicalMargin() = cbFrame->GetUsedMargin();
cbReflowInput->ComputedPhysicalPadding() = cbFrame->GetUsedPadding();
cbReflowInput->ComputedPhysicalBorderPadding() =
cbFrame->GetUsedBorderAndPadding();
parentReflowInput.mCBReflowInput = cbReflowInput.ptr();
}
NS_WARNING_ASSERTION(parentSize.ISize(parentWM) != NS_INTRINSICSIZE &&
parentSize.BSize(parentWM) != NS_INTRINSICSIZE,
"parentSize should be valid");
parentReflowInput.SetComputedISize(std::max(parentSize.ISize(parentWM), 0));
parentReflowInput.SetComputedBSize(std::max(parentSize.BSize(parentWM), 0));
parentReflowInput.ComputedPhysicalMargin().SizeTo(0, 0, 0, 0);
parentReflowInput.ComputedPhysicalPadding() = parentFrame->GetUsedPadding();
parentReflowInput.ComputedPhysicalBorderPadding() =
parentFrame->GetUsedBorderAndPadding();
LogicalSize availSize = parentSize.ConvertTo(frameWM, parentWM);
availSize.BSize(frameWM) = NS_INTRINSICSIZE;
ViewportFrame* viewport = do_QueryFrame(parentFrame);
nsSize cbSize = viewport ?
viewport->AdjustReflowInputAsContainingBlock(&parentReflowInput).Size()
: aFrame->GetContainingBlock()->GetSize();
const nsMargin& parentBorder =
parentReflowInput.mStyleBorder->GetComputedBorder();
cbSize -= nsSize(parentBorder.LeftRight(), parentBorder.TopBottom());
LogicalSize lcbSize(frameWM, cbSize);
ReflowInput reflowInput(aFrame->PresContext(), parentReflowInput, aFrame,
availSize, &lcbSize);
nsSize computedSize(reflowInput.ComputedWidth(),
reflowInput.ComputedHeight());
computedSize.width += reflowInput.ComputedPhysicalBorderPadding().LeftRight();
if (computedSize.height != NS_INTRINSICSIZE) {
computedSize.height +=
reflowInput.ComputedPhysicalBorderPadding().TopBottom();
}
nsSize size = aFrame->GetSize();
// The RecomputePosition hint is not used if any offset changed between auto
// and non-auto. If computedSize.height == NS_INTRINSICSIZE then the new
// element height will be its intrinsic height, and since 'top' and 'bottom''s
// auto-ness hasn't changed, the old height must also be its intrinsic
// height, which we can assume hasn't changed (or reflow would have
// been triggered).
if (computedSize.width == size.width &&
(computedSize.height == NS_INTRINSICSIZE || computedSize.height == size.height)) {
// If we're solving for 'left' or 'top', then compute it here, in order to
// match the reflow code path.
if (NS_AUTOOFFSET == reflowInput.ComputedPhysicalOffsets().left) {
reflowInput.ComputedPhysicalOffsets().left = cbSize.width -
reflowInput.ComputedPhysicalOffsets().right -
reflowInput.ComputedPhysicalMargin().right -
size.width -
reflowInput.ComputedPhysicalMargin().left;
}
if (NS_AUTOOFFSET == reflowInput.ComputedPhysicalOffsets().top) {
reflowInput.ComputedPhysicalOffsets().top = cbSize.height -
reflowInput.ComputedPhysicalOffsets().bottom -
reflowInput.ComputedPhysicalMargin().bottom -
size.height -
reflowInput.ComputedPhysicalMargin().top;
}
// Move the frame
nsPoint pos(parentBorder.left + reflowInput.ComputedPhysicalOffsets().left +
reflowInput.ComputedPhysicalMargin().left,
parentBorder.top + reflowInput.ComputedPhysicalOffsets().top +
reflowInput.ComputedPhysicalMargin().top);
aFrame->SetPosition(pos);
return true;
}
// Fall back to a reflow
StyleChangeReflow(aFrame, nsChangeHint_NeedReflow);
return false;
}
static bool
HasBoxAncestor(nsIFrame* aFrame)
{
for (nsIFrame* f = aFrame; f; f = f->GetParent()) {
if (f->IsXULBoxFrame()) {
return true;
}
}
return false;
}
/**
* Return true if aFrame's subtree has placeholders for out-of-flow content
* whose 'position' style's bit in aPositionMask is set.
*/
static bool
FrameHasPositionedPlaceholderDescendants(nsIFrame* aFrame,
uint32_t aPositionMask)
{
MOZ_ASSERT(aPositionMask & (1 << NS_STYLE_POSITION_FIXED));
for (nsIFrame::ChildListIterator lists(aFrame); !lists.IsDone(); lists.Next()) {
for (nsIFrame* f : lists.CurrentList()) {
if (f->GetType() == nsGkAtoms::placeholderFrame) {
nsIFrame* outOfFlow =
nsPlaceholderFrame::GetRealFrameForPlaceholder(f);
// If SVG text frames could appear here, they could confuse us since
// they ignore their position style ... but they can't.
NS_ASSERTION(!nsSVGUtils::IsInSVGTextSubtree(outOfFlow),
"SVG text frames can't be out of flow");
if (aPositionMask & (1 << outOfFlow->StyleDisplay()->mPosition)) {
return true;
}
}
uint32_t positionMask = aPositionMask;
// NOTE: It's tempting to check f->IsAbsPosContainingBlock() or
// f->IsFixedPosContainingBlock() here. However, that would only
// be testing the *new* style of the frame, which might exclude
// descendants that currently have this frame as an abs-pos
// containing block. Taking the codepath where we don't reframe
// could lead to an unsafe call to
// cont->MarkAsNotAbsoluteContainingBlock() before we've reframed
// the descendant and taken it off the absolute list.
if (FrameHasPositionedPlaceholderDescendants(f, positionMask)) {
return true;
}
}
}
return false;
}
static bool
NeedToReframeForAddingOrRemovingTransform(nsIFrame* aFrame)
{
static_assert(0 <= NS_STYLE_POSITION_ABSOLUTE &&
NS_STYLE_POSITION_ABSOLUTE < 32, "Style constant out of range");
static_assert(0 <= NS_STYLE_POSITION_FIXED &&
NS_STYLE_POSITION_FIXED < 32, "Style constant out of range");
uint32_t positionMask;
// Don't call aFrame->IsPositioned here, since that returns true if
// the frame already has a transform, and we want to ignore that here
if (aFrame->IsAbsolutelyPositioned() || aFrame->IsRelativelyPositioned()) {
// This frame is a container for abs-pos descendants whether or not it
// has a transform.
// So abs-pos descendants are no problem; we only need to reframe if
// we have fixed-pos descendants.
positionMask = 1 << NS_STYLE_POSITION_FIXED;
} else {
// This frame may not be a container for abs-pos descendants already.
// So reframe if we have abs-pos or fixed-pos descendants.
positionMask =
(1 << NS_STYLE_POSITION_FIXED) | (1 << NS_STYLE_POSITION_ABSOLUTE);
}
for (nsIFrame* f = aFrame; f;
f = nsLayoutUtils::GetNextContinuationOrIBSplitSibling(f)) {
if (FrameHasPositionedPlaceholderDescendants(f, positionMask)) {
return true;
}
}
return false;
}
/* static */ nsIFrame*
RestyleManager::GetNearestAncestorFrame(nsIContent* aContent)
{
nsIFrame* ancestorFrame = nullptr;
for (nsIContent* ancestor = aContent->GetParent();
ancestor && !ancestorFrame;
ancestor = ancestor->GetParent()) {
ancestorFrame = ancestor->GetPrimaryFrame();
}
return ancestorFrame;
}
/* static */ nsIFrame*
RestyleManager::GetNextBlockInInlineSibling(FramePropertyTable* aPropTable,
nsIFrame* aFrame)
{
NS_ASSERTION(!aFrame->GetPrevContinuation(),
"must start with the first continuation");
// Might we have ib-split siblings?
if (!(aFrame->GetStateBits() & NS_FRAME_PART_OF_IBSPLIT)) {
// nothing more to do here
return nullptr;
}
return static_cast<nsIFrame*>
(aPropTable->Get(aFrame, nsIFrame::IBSplitSibling()));
}
static void
DoApplyRenderingChangeToTree(nsIFrame* aFrame,
nsChangeHint aChange)
{
NS_PRECONDITION(gInApplyRenderingChangeToTree,
"should only be called within ApplyRenderingChangeToTree");
for ( ; aFrame; aFrame = nsLayoutUtils::GetNextContinuationOrIBSplitSibling(aFrame)) {
// Invalidate and sync views on all descendant frames, following placeholders.
// We don't need to update transforms in SyncViewsAndInvalidateDescendants, because
// there can't be any out-of-flows or popups that need to be transformed;
// all out-of-flow descendants of the transformed element must also be
// descendants of the transformed frame.
SyncViewsAndInvalidateDescendants(aFrame,
nsChangeHint(aChange & (nsChangeHint_RepaintFrame |
nsChangeHint_SyncFrameView |
nsChangeHint_UpdateOpacityLayer |
nsChangeHint_SchedulePaint)));
// This must be set to true if the rendering change needs to
// invalidate content. If it's false, a composite-only paint
// (empty transaction) will be scheduled.
bool needInvalidatingPaint = false;
// if frame has view, will already be invalidated
if (aChange & nsChangeHint_RepaintFrame) {
// Note that this whole block will be skipped when painting is suppressed
// (due to our caller ApplyRendingChangeToTree() discarding the
// nsChangeHint_RepaintFrame hint). If you add handling for any other
// hints within this block, be sure that they too should be ignored when
// painting is suppressed.
needInvalidatingPaint = true;
aFrame->InvalidateFrameSubtree();
if ((aChange & nsChangeHint_UpdateEffects) &&
aFrame->IsFrameOfType(nsIFrame::eSVG) &&
!(aFrame->GetStateBits() & NS_STATE_IS_OUTER_SVG)) {
// Need to update our overflow rects:
nsSVGUtils::ScheduleReflowSVG(aFrame);
}
}
if (aChange & nsChangeHint_UpdateTextPath) {
if (nsSVGUtils::IsInSVGTextSubtree(aFrame)) {
// Invalidate and reflow the entire SVGTextFrame:
NS_ASSERTION(aFrame->GetContent()->IsSVGElement(nsGkAtoms::textPath),
"expected frame for a <textPath> element");
nsIFrame* text =
nsLayoutUtils::GetClosestFrameOfType(aFrame, nsGkAtoms::svgTextFrame);
NS_ASSERTION(text, "expected to find an ancestor SVGTextFrame");
static_cast<SVGTextFrame*>(text)->NotifyGlyphMetricsChange();
} else {
MOZ_ASSERT(false, "unexpected frame got nsChangeHint_UpdateTextPath");
}
}
if (aChange & nsChangeHint_UpdateOpacityLayer) {
// FIXME/bug 796697: we can get away with empty transactions for
// opacity updates in many cases.
needInvalidatingPaint = true;
ActiveLayerTracker::NotifyRestyle(aFrame, eCSSProperty_opacity);
if (nsSVGIntegrationUtils::UsingEffectsForFrame(aFrame)) {
// SVG effects paints the opacity without using
// nsDisplayOpacity. We need to invalidate manually.
aFrame->InvalidateFrameSubtree();
}
}
if ((aChange & nsChangeHint_UpdateTransformLayer) &&
aFrame->IsTransformed()) {
ActiveLayerTracker::NotifyRestyle(aFrame, eCSSProperty_transform);
// If we're not already going to do an invalidating paint, see
// if we can get away with only updating the transform on a
// layer for this frame, and not scheduling an invalidating
// paint.
if (!needInvalidatingPaint) {
Layer* layer;
needInvalidatingPaint |= !aFrame->TryUpdateTransformOnly(&layer);
if (!needInvalidatingPaint) {
// Since we're not going to paint, we need to resend animation
// data to the layer.
MOZ_ASSERT(layer, "this can't happen if there's no layer");
nsDisplayListBuilder::AddAnimationsAndTransitionsToLayer(
layer, nullptr, nullptr, aFrame, eCSSProperty_transform);
}
}
}
if (aChange & nsChangeHint_ChildrenOnlyTransform) {
needInvalidatingPaint = true;
nsIFrame* childFrame =
GetFrameForChildrenOnlyTransformHint(aFrame)->PrincipalChildList().FirstChild();
for ( ; childFrame; childFrame = childFrame->GetNextSibling()) {
ActiveLayerTracker::NotifyRestyle(childFrame, eCSSProperty_transform);
}
}
if (aChange & nsChangeHint_SchedulePaint) {
needInvalidatingPaint = true;
}
aFrame->SchedulePaint(needInvalidatingPaint
? nsIFrame::PAINT_DEFAULT
: nsIFrame::PAINT_COMPOSITE_ONLY);
}
}
static void
SyncViewsAndInvalidateDescendants(nsIFrame* aFrame, nsChangeHint aChange)
{
NS_PRECONDITION(gInApplyRenderingChangeToTree,
"should only be called within ApplyRenderingChangeToTree");
NS_ASSERTION(nsChangeHint_size_t(aChange) ==
(aChange & (nsChangeHint_RepaintFrame |
nsChangeHint_SyncFrameView |
nsChangeHint_UpdateOpacityLayer |
nsChangeHint_SchedulePaint)),
"Invalid change flag");
if (aChange & nsChangeHint_SyncFrameView) {
aFrame->SyncFrameViewProperties();
}
nsIFrame::ChildListIterator lists(aFrame);
for (; !lists.IsDone(); lists.Next()) {
for (nsIFrame* child : lists.CurrentList()) {
if (!(child->GetStateBits() & NS_FRAME_OUT_OF_FLOW)) {
// only do frames that don't have placeholders
if (nsGkAtoms::placeholderFrame == child->GetType()) {
// do the out-of-flow frame and its continuations
nsIFrame* outOfFlowFrame =
nsPlaceholderFrame::GetRealFrameForPlaceholder(child);
DoApplyRenderingChangeToTree(outOfFlowFrame, aChange);
} else if (lists.CurrentID() == nsIFrame::kPopupList) {
DoApplyRenderingChangeToTree(child, aChange);
} else { // regular frame
SyncViewsAndInvalidateDescendants(child, aChange);
}
}
}
}
}
static void
ApplyRenderingChangeToTree(nsIPresShell* aPresShell,
nsIFrame* aFrame,
nsChangeHint aChange)
{
// We check StyleDisplay()->HasTransformStyle() in addition to checking
// IsTransformed() since we can get here for some frames that don't support
// CSS transforms.
NS_ASSERTION(!(aChange & nsChangeHint_UpdateTransformLayer) ||
aFrame->IsTransformed() ||
aFrame->StyleDisplay()->HasTransformStyle(),
"Unexpected UpdateTransformLayer hint");
if (aPresShell->IsPaintingSuppressed()) {
// Don't allow synchronous rendering changes when painting is turned off.
aChange &= ~nsChangeHint_RepaintFrame;
if (!aChange) {
return;
}
}
// Trigger rendering updates by damaging this frame and any
// continuations of this frame.
#ifdef DEBUG
gInApplyRenderingChangeToTree = true;
#endif
if (aChange & nsChangeHint_RepaintFrame) {
// If the frame's background is propagated to an ancestor, walk up to
// that ancestor and apply the RepaintFrame change hint to it.
nsStyleContext* bgSC;
nsIFrame* propagatedFrame = aFrame;
while (!nsCSSRendering::FindBackground(propagatedFrame, &bgSC)) {
propagatedFrame = propagatedFrame->GetParent();
NS_ASSERTION(aFrame, "root frame must paint");
}
if (propagatedFrame != aFrame) {
DoApplyRenderingChangeToTree(propagatedFrame, nsChangeHint_RepaintFrame);
aChange &= ~nsChangeHint_RepaintFrame;
if (!aChange) {
return;
}
}
}
DoApplyRenderingChangeToTree(aFrame, aChange);
#ifdef DEBUG
gInApplyRenderingChangeToTree = false;
#endif
}
static void
AddSubtreeToOverflowTracker(nsIFrame* aFrame,
OverflowChangedTracker& aOverflowChangedTracker)
{
if (aFrame->FrameMaintainsOverflow()) {
aOverflowChangedTracker.AddFrame(aFrame,
OverflowChangedTracker::CHILDREN_CHANGED);
}
nsIFrame::ChildListIterator lists(aFrame);
for (; !lists.IsDone(); lists.Next()) {
for (nsIFrame* child : lists.CurrentList()) {
AddSubtreeToOverflowTracker(child, aOverflowChangedTracker);
}
}
}
static void
StyleChangeReflow(nsIFrame* aFrame, nsChangeHint aHint)
{
nsIPresShell::IntrinsicDirty dirtyType;
if (aHint & nsChangeHint_ClearDescendantIntrinsics) {
NS_ASSERTION(aHint & nsChangeHint_ClearAncestorIntrinsics,
"Please read the comments in nsChangeHint.h");
NS_ASSERTION(aHint & nsChangeHint_NeedDirtyReflow,
"ClearDescendantIntrinsics requires NeedDirtyReflow");
dirtyType = nsIPresShell::eStyleChange;
} else if ((aHint & nsChangeHint_UpdateComputedBSize) &&
aFrame->HasAnyStateBits(
NS_FRAME_DESCENDANT_INTRINSIC_ISIZE_DEPENDS_ON_BSIZE)) {
dirtyType = nsIPresShell::eStyleChange;
} else if (aHint & nsChangeHint_ClearAncestorIntrinsics) {
dirtyType = nsIPresShell::eTreeChange;
} else if ((aHint & nsChangeHint_UpdateComputedBSize) &&
HasBoxAncestor(aFrame)) {
// The frame's computed BSize is changing, and we have a box ancestor
// whose cached intrinsic height may need to be updated.
dirtyType = nsIPresShell::eTreeChange;
} else {
dirtyType = nsIPresShell::eResize;
}
nsFrameState dirtyBits;
if (aFrame->GetStateBits() & NS_FRAME_FIRST_REFLOW) {
dirtyBits = nsFrameState(0);
} else if ((aHint & nsChangeHint_NeedDirtyReflow) ||
dirtyType == nsIPresShell::eStyleChange) {
dirtyBits = NS_FRAME_IS_DIRTY;
} else {
dirtyBits = NS_FRAME_HAS_DIRTY_CHILDREN;
}
// If we're not going to clear any intrinsic sizes on the frames, and
// there are no dirty bits to set, then there's nothing to do.
if (dirtyType == nsIPresShell::eResize && !dirtyBits)
return;
nsIPresShell::ReflowRootHandling rootHandling;
if (aHint & nsChangeHint_ReflowChangesSizeOrPosition) {
rootHandling = nsIPresShell::ePositionOrSizeChange;
} else {
rootHandling = nsIPresShell::eNoPositionOrSizeChange;
}
do {
aFrame->PresContext()->PresShell()->FrameNeedsReflow(
aFrame, dirtyType, dirtyBits, rootHandling);
aFrame = nsLayoutUtils::GetNextContinuationOrIBSplitSibling(aFrame);
} while (aFrame);
}
/* static */ nsIFrame*
RestyleManager::GetNextContinuationWithSameStyle(
nsIFrame* aFrame, nsStyleContext* aOldStyleContext,
bool* aHaveMoreContinuations)
{
// See GetPrevContinuationWithSameStyle about {ib} splits.
nsIFrame* nextContinuation = aFrame->GetNextContinuation();
if (!nextContinuation &&
(aFrame->GetStateBits() & NS_FRAME_PART_OF_IBSPLIT)) {
// We're the last continuation, so we have to hop back to the first
// before getting the frame property
nextContinuation =
aFrame->FirstContinuation()->Properties().Get(nsIFrame::IBSplitSibling());
if (nextContinuation) {
nextContinuation =
nextContinuation->Properties().Get(nsIFrame::IBSplitSibling());
}
}
if (!nextContinuation) {
return nullptr;
}
NS_ASSERTION(nextContinuation->GetContent() == aFrame->GetContent(),
"unexpected content mismatch");
nsStyleContext* nextStyle = nextContinuation->StyleContext();
if (nextStyle != aOldStyleContext) {
NS_ASSERTION(aOldStyleContext->GetPseudo() != nextStyle->GetPseudo() ||
aOldStyleContext->GetParentAllowServo() !=
nextStyle->GetParentAllowServo(),
"continuations should have the same style context");
nextContinuation = nullptr;
if (aHaveMoreContinuations) {
*aHaveMoreContinuations = true;
}
}
return nextContinuation;
}
void
RestyleManager::ProcessRestyledFrames(nsStyleChangeList& aChangeList)
{
NS_ASSERTION(!nsContentUtils::IsSafeToRunScript(),
"Someone forgot a script blocker");
if (aChangeList.IsEmpty())
return;
PROFILER_LABEL("RestyleManager", "ProcessRestyledFrames",
js::ProfileEntry::Category::CSS);
nsPresContext* presContext = PresContext();
FramePropertyTable* propTable = presContext->PropertyTable();
nsCSSFrameConstructor* frameConstructor = presContext->FrameConstructor();
// Make sure to not rebuild quote or counter lists while we're
// processing restyles
frameConstructor->BeginUpdate();
// Mark frames so that we skip frames that die along the way, bug 123049.
// A frame can be in the list multiple times with different hints. Further
// optmization is possible if nsStyleChangeList::AppendChange could coalesce
for (const nsStyleChangeData& data : aChangeList) {
if (data.mFrame) {
propTable->Set(data.mFrame, ChangeListProperty(), true);
}
}
bool didUpdateCursor = false;
for (size_t i = 0; i < aChangeList.Length(); ++i) {
// Collect and coalesce adjacent siblings for lazy frame construction.
// Eventually it would be even better to make RecreateFramesForContent
// accept a range and coalesce all adjacent reconstructs (bug 1344139).
size_t lazyRangeStart = i;
while (i < aChangeList.Length() &&
aChangeList[i].mContent &&
aChangeList[i].mContent->HasFlag(NODE_NEEDS_FRAME) &&
(i == lazyRangeStart ||
aChangeList[i - 1].mContent->GetNextSibling() == aChangeList[i].mContent))
{
MOZ_ASSERT(aChangeList[i].mHint & nsChangeHint_ReconstructFrame);
MOZ_ASSERT(!aChangeList[i].mFrame);
++i;
}
if (i != lazyRangeStart) {
nsIContent* start = aChangeList[lazyRangeStart].mContent;
nsIContent* end = aChangeList[i-1].mContent->GetNextSibling();
nsIContent* container = start->GetParent();
MOZ_ASSERT(container);
if (!end) {
frameConstructor->ContentAppended(container, start, false);
} else {
frameConstructor->ContentRangeInserted(container, start, end, nullptr, false);
}
}
for (size_t j = lazyRangeStart; j < i; ++j) {
MOZ_ASSERT_IF(aChangeList[j].mContent->GetPrimaryFrame(),
!aChangeList[j].mContent->HasFlag(NODE_NEEDS_FRAME));
}
if (i == aChangeList.Length()) {
break;
}
nsStyleChangeData& mutable_data = aChangeList[i];
const nsStyleChangeData& data = mutable_data;
nsIFrame* frame = data.mFrame;
nsIContent* content = data.mContent;
nsChangeHint hint = data.mHint;
bool didReflowThisFrame = false;
NS_ASSERTION(!(hint & nsChangeHint_AllReflowHints) ||
(hint & nsChangeHint_NeedReflow),
"Reflow hint bits set without actually asking for a reflow");
// skip any frame that has been destroyed due to a ripple effect
if (frame && !propTable->HasSkippingBitCheck(frame, ChangeListProperty())) {
// Null out the pointer since the frame was already destroyed.
// This is important so we don't try to delete its
// ChangeListProperty() below.
mutable_data.mFrame = nullptr;
continue;
}
if (frame && frame->GetContent() != content) {
// XXXbz this is due to image maps messing with the primary frame of
// <area>s. See bug 135040. Remove this block once that's fixed.
frame = nullptr;
if (!(hint & nsChangeHint_ReconstructFrame)) {
continue;
}
}
if ((hint & nsChangeHint_UpdateContainingBlock) && frame &&
!(hint & nsChangeHint_ReconstructFrame)) {
if (NeedToReframeForAddingOrRemovingTransform(frame) ||
frame->GetType() == nsGkAtoms::fieldSetFrame ||
frame->GetContentInsertionFrame() != frame) {
// The frame has positioned children that need to be reparented, or
// it can't easily be converted to/from being an abs-pos container correctly.
hint |= nsChangeHint_ReconstructFrame;
} else {
for (nsIFrame* cont = frame; cont;
cont = nsLayoutUtils::GetNextContinuationOrIBSplitSibling(cont)) {
// Normally frame construction would set state bits as needed,
// but we're not going to reconstruct the frame so we need to set them.
// It's because we need to set this state on each affected frame
// that we can't coalesce nsChangeHint_UpdateContainingBlock hints up
// to ancestors (i.e. it can't be an change hint that is handled for
// descendants).
if (cont->IsAbsPosContainingBlock()) {
if (!cont->IsAbsoluteContainer() &&
(cont->GetStateBits() & NS_FRAME_CAN_HAVE_ABSPOS_CHILDREN)) {
cont->MarkAsAbsoluteContainingBlock();
}
} else {
if (cont->IsAbsoluteContainer()) {
if (cont->HasAbsolutelyPositionedChildren()) {
// If |cont| still has absolutely positioned children,
// we can't call MarkAsNotAbsoluteContainingBlock. This
// will remove a frame list that still has children in
// it that we need to keep track of.
// The optimization of removing it isn't particularly
// important, although it does mean we skip some tests.
NS_WARNING("skipping removal of absolute containing block");
} else {
cont->MarkAsNotAbsoluteContainingBlock();
}
}
}
}
}
}
if ((hint & nsChangeHint_AddOrRemoveTransform) && frame &&
!(hint & nsChangeHint_ReconstructFrame)) {
for (nsIFrame* cont = frame; cont;
cont = nsLayoutUtils::GetNextContinuationOrIBSplitSibling(cont)) {
if (cont->StyleDisplay()->HasTransform(cont)) {
cont->AddStateBits(NS_FRAME_MAY_BE_TRANSFORMED);
}
// Don't remove NS_FRAME_MAY_BE_TRANSFORMED since it may still be
// transformed by other means. It's OK to have the bit even if it's
// not needed.
}
}
if (hint & nsChangeHint_ReconstructFrame) {
// We're about to destroy data.mFrame, so null out the pointer.
// This is important so we don't try to delete its
// ChangeListProperty() below.
mutable_data.mFrame = nullptr;
// If we ever start passing true here, be careful of restyles
// that involve a reframe and animations. In particular, if the
// restyle we're processing here is an animation restyle, but
// the style resolution we will do for the frame construction
// happens async when we're not in an animation restyle already,
// problems could arise.
// We could also have problems with triggering of CSS transitions
// on elements whose frames are reconstructed, since we depend on
// the reconstruction happening synchronously.
frameConstructor->RecreateFramesForContent(content, false,
nsCSSFrameConstructor::REMOVE_FOR_RECONSTRUCTION, nullptr);
} else {
NS_ASSERTION(frame, "This shouldn't happen");
if (!frame->FrameMaintainsOverflow()) {
// frame does not maintain overflow rects, so avoid calling
// FinishAndStoreOverflow on it:
hint &= ~(nsChangeHint_UpdateOverflow |
nsChangeHint_ChildrenOnlyTransform |
nsChangeHint_UpdatePostTransformOverflow |
nsChangeHint_UpdateParentOverflow);
}
if (!(frame->GetStateBits() & NS_FRAME_MAY_BE_TRANSFORMED)) {
// Frame can not be transformed, and thus a change in transform will
// have no effect and we should not use the
// nsChangeHint_UpdatePostTransformOverflow hint.
hint &= ~nsChangeHint_UpdatePostTransformOverflow;
}
if (hint & nsChangeHint_UpdateEffects) {
for (nsIFrame* cont = frame; cont;
cont = nsLayoutUtils::GetNextContinuationOrIBSplitSibling(cont)) {
nsSVGEffects::UpdateEffects(cont);
}
}
if ((hint & nsChangeHint_InvalidateRenderingObservers) ||
((hint & nsChangeHint_UpdateOpacityLayer) &&
frame->IsFrameOfType(nsIFrame::eSVG) &&
!(frame->GetStateBits() & NS_STATE_IS_OUTER_SVG))) {
nsSVGEffects::InvalidateRenderingObservers(frame);
}
if (hint & nsChangeHint_NeedReflow) {
StyleChangeReflow(frame, hint);
didReflowThisFrame = true;
}
if ((hint & nsChangeHint_UpdateUsesOpacity) &&
frame->IsFrameOfType(nsIFrame::eTablePart)) {
NS_ASSERTION(hint & nsChangeHint_UpdateOpacityLayer,
"should only return UpdateUsesOpacity hint "
"when also returning UpdateOpacityLayer hint");
// When an internal table part (including cells) changes between
// having opacity 1 and non-1, it changes whether its
// backgrounds (and those of table parts inside of it) are
// painted as part of the table's nsDisplayTableBorderBackground
// display item, or part of its own display item. That requires
// invalidation, so change UpdateOpacityLayer to RepaintFrame.
hint &= ~nsChangeHint_UpdateOpacityLayer;
hint |= nsChangeHint_RepaintFrame;
}
// Opacity disables preserve-3d, so if we toggle it, then we also need
// to update the overflow areas of all potentially affected frames.
if ((hint & nsChangeHint_UpdateUsesOpacity) &&
frame->StyleDisplay()->mTransformStyle == NS_STYLE_TRANSFORM_STYLE_PRESERVE_3D) {
hint |= nsChangeHint_UpdateSubtreeOverflow;
}
if (hint & nsChangeHint_UpdateBackgroundPosition) {
// For most frame types, DLBI can detect background position changes,
// so we only need to schedule a paint.
hint |= nsChangeHint_SchedulePaint;
if (frame->IsFrameOfType(nsIFrame::eTablePart) ||
frame->IsFrameOfType(nsIFrame::eMathML)) {
// Table parts and MathML frames don't build display items for their
// backgrounds, so DLBI can't detect background-position changes for
// these frames. Repaint the whole frame.
hint |= nsChangeHint_RepaintFrame;
}
}
if (hint & (nsChangeHint_RepaintFrame | nsChangeHint_SyncFrameView |
nsChangeHint_UpdateOpacityLayer | nsChangeHint_UpdateTransformLayer |
nsChangeHint_ChildrenOnlyTransform | nsChangeHint_SchedulePaint)) {
ApplyRenderingChangeToTree(presContext->PresShell(), frame, hint);
}
if ((hint & nsChangeHint_RecomputePosition) && !didReflowThisFrame) {
ActiveLayerTracker::NotifyOffsetRestyle(frame);
// It is possible for this to fall back to a reflow
if (!RecomputePosition(frame)) {
didReflowThisFrame = true;
}
}
NS_ASSERTION(!(hint & nsChangeHint_ChildrenOnlyTransform) ||
(hint & nsChangeHint_UpdateOverflow),
"nsChangeHint_UpdateOverflow should be passed too");
if (!didReflowThisFrame &&
(hint & (nsChangeHint_UpdateOverflow |
nsChangeHint_UpdatePostTransformOverflow |
nsChangeHint_UpdateParentOverflow |
nsChangeHint_UpdateSubtreeOverflow))) {
if (hint & nsChangeHint_UpdateSubtreeOverflow) {
for (nsIFrame* cont = frame; cont; cont =
nsLayoutUtils::GetNextContinuationOrIBSplitSibling(cont)) {
AddSubtreeToOverflowTracker(cont, mOverflowChangedTracker);
}
// The work we just did in AddSubtreeToOverflowTracker
// subsumes some of the other hints:
hint &= ~(nsChangeHint_UpdateOverflow |
nsChangeHint_UpdatePostTransformOverflow);
}
if (hint & nsChangeHint_ChildrenOnlyTransform) {
// The overflow areas of the child frames need to be updated:
nsIFrame* hintFrame = GetFrameForChildrenOnlyTransformHint(frame);
nsIFrame* childFrame = hintFrame->PrincipalChildList().FirstChild();
NS_ASSERTION(!nsLayoutUtils::GetNextContinuationOrIBSplitSibling(frame),
"SVG frames should not have continuations "
"or ib-split siblings");
NS_ASSERTION(!nsLayoutUtils::GetNextContinuationOrIBSplitSibling(hintFrame),
"SVG frames should not have continuations "
"or ib-split siblings");
for ( ; childFrame; childFrame = childFrame->GetNextSibling()) {
MOZ_ASSERT(childFrame->IsFrameOfType(nsIFrame::eSVG),
"Not expecting non-SVG children");
// If |childFrame| is dirty or has dirty children, we don't bother
// updating overflows since that will happen when it's reflowed.
if (!(childFrame->GetStateBits() &
(NS_FRAME_IS_DIRTY | NS_FRAME_HAS_DIRTY_CHILDREN))) {
mOverflowChangedTracker.AddFrame(childFrame,
OverflowChangedTracker::CHILDREN_CHANGED);
}
NS_ASSERTION(!nsLayoutUtils::GetNextContinuationOrIBSplitSibling(childFrame),
"SVG frames should not have continuations "
"or ib-split siblings");
NS_ASSERTION(childFrame->GetParent() == hintFrame,
"SVG child frame not expected to have different parent");
}
}
// If |frame| is dirty or has dirty children, we don't bother updating
// overflows since that will happen when it's reflowed.
if (!(frame->GetStateBits() &
(NS_FRAME_IS_DIRTY | NS_FRAME_HAS_DIRTY_CHILDREN))) {
if (hint & (nsChangeHint_UpdateOverflow |
nsChangeHint_UpdatePostTransformOverflow)) {
OverflowChangedTracker::ChangeKind changeKind;
// If we have both nsChangeHint_UpdateOverflow and
// nsChangeHint_UpdatePostTransformOverflow,
// CHILDREN_CHANGED is selected as it is
// strictly stronger.
if (hint & nsChangeHint_UpdateOverflow) {
changeKind = OverflowChangedTracker::CHILDREN_CHANGED;
} else {
changeKind = OverflowChangedTracker::TRANSFORM_CHANGED;
}
for (nsIFrame* cont = frame; cont; cont =
nsLayoutUtils::GetNextContinuationOrIBSplitSibling(cont)) {
mOverflowChangedTracker.AddFrame(cont, changeKind);
}
}
// UpdateParentOverflow hints need to be processed in addition
// to the above, since if the processing of the above hints
// yields no change, the update will not propagate to the
// parent.
if (hint & nsChangeHint_UpdateParentOverflow) {
MOZ_ASSERT(frame->GetParent(),
"shouldn't get style hints for the root frame");
for (nsIFrame* cont = frame; cont; cont =
nsLayoutUtils::GetNextContinuationOrIBSplitSibling(cont)) {
mOverflowChangedTracker.AddFrame(cont->GetParent(),
OverflowChangedTracker::CHILDREN_CHANGED);
}
}
}
}
if ((hint & nsChangeHint_UpdateCursor) && !didUpdateCursor) {
presContext->PresShell()->SynthesizeMouseMove(false);
didUpdateCursor = true;
}
}
}
frameConstructor->EndUpdate();
// cleanup references and verify the style tree. Note that the latter needs
// to happen once we've processed the whole list, since until then the tree
// is not in fact in a consistent state.
for (const nsStyleChangeData& data : aChangeList) {
if (data.mFrame) {
propTable->DeleteSkippingBitCheck(data.mFrame, ChangeListProperty());
}
#ifdef DEBUG
// reget frame from content since it may have been regenerated...
if (data.mContent) {
nsIFrame* frame = data.mContent->GetPrimaryFrame();
if (frame) {
DebugVerifyStyleTree(frame);
}
} else if (!data.mFrame ||
data.mFrame->GetType() != nsGkAtoms::viewportFrame) {
NS_WARNING("Unable to test style tree integrity -- no content node "
"(and not a viewport frame)");
}
#endif
}
aChangeList.Clear();
}
RestyleManager::AnimationsWithDestroyedFrame::AnimationsWithDestroyedFrame(
RestyleManager* aRestyleManager)
: mRestyleManager(aRestyleManager)
, mRestorePointer(mRestyleManager->mAnimationsWithDestroyedFrame)
{
MOZ_ASSERT(!mRestyleManager->mAnimationsWithDestroyedFrame,
"shouldn't construct recursively");
mRestyleManager->mAnimationsWithDestroyedFrame = this;
}
void
RestyleManager::AnimationsWithDestroyedFrame
::StopAnimationsForElementsWithoutFrames()
{
StopAnimationsWithoutFrame(mContents, CSSPseudoElementType::NotPseudo);
StopAnimationsWithoutFrame(mBeforeContents, CSSPseudoElementType::before);
StopAnimationsWithoutFrame(mAfterContents, CSSPseudoElementType::after);
}
void
RestyleManager::AnimationsWithDestroyedFrame
::StopAnimationsWithoutFrame(
nsTArray<RefPtr<nsIContent>>& aArray,
CSSPseudoElementType aPseudoType)
{
nsAnimationManager* animationManager =
mRestyleManager->PresContext()->AnimationManager();
nsTransitionManager* transitionManager =
mRestyleManager->PresContext()->TransitionManager();
for (nsIContent* content : aArray) {
if (content->GetPrimaryFrame()) {
continue;
}
dom::Element* element = content->AsElement();
animationManager->StopAnimationsForElement(element, aPseudoType);
transitionManager->StopAnimationsForElement(element, aPseudoType);
// All other animations should keep running but not running on the
// *compositor* at this point.
EffectSet* effectSet = EffectSet::GetEffectSet(element, aPseudoType);
if (effectSet) {
for (KeyframeEffectReadOnly* effect : *effectSet) {
effect->ResetIsRunningOnCompositor();
}
}
}
}
} // namespace mozilla
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