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Bug 1342009 - Provide a shortcut in BuildDisplayListForChild. r=mattwoodrow

This commit is contained in:
Thinker K.F. Li 2017-05-04 02:06:00 +08:00
Родитель c24d2c4ce4
Коммит 70bcac7cb4
4 изменённых файлов: 180 добавлений и 56 удалений
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140
layout/generic/nsFrame.cpp
Просмотреть файл

@ -977,7 +977,8 @@ nsFrame::DidSetStyleContext(nsStyleContext* aOldStyleContext)
PresContext()->SetBidiEnabled();
}
RemoveStateBits(NS_FRAME_SIMPLE_EVENT_REGIONS);
RemoveStateBits(NS_FRAME_SIMPLE_EVENT_REGIONS |
NS_FRAME_SIMPLE_DISPLAYLIST);
}
void
@ -2156,8 +2157,10 @@ nsIFrame::GetClipPropClipRect(const nsStyleDisplay* aDisp,
* handled by constructing a dedicated nsHTML/XULScrollFrame, set up clipping
* for that overflow in aBuilder->ClipState() to clip all containing-block
* descendants.
*
* Return true if clipping was applied.
*/
static void
static bool
ApplyOverflowClipping(nsDisplayListBuilder* aBuilder,
const nsIFrame* aFrame,
const nsStyleDisplay* aDisp,
@ -2169,7 +2172,7 @@ ApplyOverflowClipping(nsDisplayListBuilder* aBuilder,
// is required by comboboxes which make their display text (an inline frame)
// have clipping.
if (!nsFrame::ShouldApplyOverflowClipping(aFrame, aDisp)) {
return;
return false;
}
nsRect clipRect;
bool haveRadii = false;
@ -2185,6 +2188,7 @@ ApplyOverflowClipping(nsDisplayListBuilder* aBuilder,
// XXX border-radius
}
aClipState.ClipContainingBlockDescendantsExtra(clipRect, haveRadii ? radii : nullptr);
return true;
}
#ifdef DEBUG
@ -2864,6 +2868,45 @@ WrapInWrapList(nsDisplayListBuilder* aBuilder,
return item;
}
/**
* Check if a frame should be visited for building display list.
*/
static bool
DescendIntoChild(nsDisplayListBuilder* aBuilder, nsIFrame *aChild,
const nsRect& aDirty)
{
nsIFrame* child = aChild;
const nsRect& dirty = aDirty;
if (!(child->GetStateBits() & NS_FRAME_FORCE_DISPLAY_LIST_DESCEND_INTO)) {
// No need to descend into child to catch placeholders for visible
// positioned stuff. So see if we can short-circuit frame traversal here.
// We can stop if child's frame subtree's intersection with the
// dirty area is empty.
// If the child is a scrollframe that we want to ignore, then we need
// to descend into it because its scrolled child may intersect the dirty
// area even if the scrollframe itself doesn't.
// There are cases where the "ignore scroll frame" on the builder is not set
// correctly, and so we additionally want to catch cases where the child is
// a root scrollframe and we are ignoring scrolling on the viewport.
nsIPresShell* shell = child->PresContext()->PresShell();
bool keepDescending = child == aBuilder->GetIgnoreScrollFrame() ||
(shell->IgnoringViewportScrolling() && child == shell->GetRootScrollFrame());
if (!keepDescending) {
nsRect childDirty;
if (!childDirty.IntersectRect(dirty, child->GetVisualOverflowRect()))
return false;
// Usually we could set dirty to childDirty now but there's no
// benefit, and it can be confusing. It can especially confuse
// situations where we're going to ignore a scrollframe's clipping;
// we wouldn't want to clip the dirty area to the scrollframe's
// bounds in that case.
}
}
return true;
}
void
nsIFrame::BuildDisplayListForChild(nsDisplayListBuilder* aBuilder,
nsIFrame* aChild,
@ -2886,11 +2929,59 @@ nsIFrame::BuildDisplayListForChild(nsDisplayListBuilder* aBuilder,
if (child->GetStateBits() & NS_FRAME_TOO_DEEP_IN_FRAME_TREE)
return;
const bool doingShortcut =
(child->GetStateBits() & NS_FRAME_SIMPLE_DISPLAYLIST) &&
aBuilder->IsPaintingToWindow() &&
// This would be changed by the change of preference.
aBuilder->IsBuildingLayerEventRegions() &&
// Animations may change the value of |HasOpacity()|.
!(child->GetContent() &&
child->GetContent()->MayHaveAnimations());
if (doingShortcut) {
// This is the shortcut for frames been handled along the common
// path, the most common one of THE COMMON CASE mentioned later.
MOZ_ASSERT(child->Type() != LayoutFrameType::Placeholder);
MOZ_ASSERT(!aBuilder->GetSelectedFramesOnly() &&
!aBuilder->GetIncludeAllOutOfFlows(),
"It should be held for painting to window");
// dirty rect in child-relative coordinates
nsRect dirty = aDirtyRect - child->GetOffsetTo(this);
if (!DescendIntoChild(aBuilder, child, dirty)) {
return;
}
nsDisplayListBuilder::AutoBuildingDisplayList
buildingForChild(aBuilder, child, dirty, false);
CheckForApzAwareEventHandlers(aBuilder, child);
nsDisplayLayerEventRegions* eventRegions = aBuilder->GetLayerEventRegions();
if (eventRegions) {
eventRegions->AddFrame(aBuilder, child);
}
child->MarkAbsoluteFramesForDisplayList(aBuilder, dirty);
aBuilder->AdjustWindowDraggingRegion(child);
child->BuildDisplayList(aBuilder, dirty, aLists);
aBuilder->DisplayCaret(child, dirty, aLists.Content());
#ifdef DEBUG
DisplayDebugBorders(aBuilder, child, aLists);
#endif
return;
}
bool isSVG = (child->GetStateBits() & NS_FRAME_SVG_LAYOUT);
// It is raised if the control flow strays off the common path.
// The common path is the most common one of THE COMMON CASE
// mentioned later.
bool awayFromCommonPath = false;
// true if this is a real or pseudo stacking context
bool pseudoStackingContext =
(aFlags & DISPLAY_CHILD_FORCE_PSEUDO_STACKING_CONTEXT) != 0;
awayFromCommonPath |= pseudoStackingContext;
if (!isSVG &&
(aFlags & DISPLAY_CHILD_INLINE) &&
!child->IsFrameOfType(eLineParticipant)) {
@ -2898,6 +2989,7 @@ nsIFrame::BuildDisplayListForChild(nsDisplayListBuilder* aBuilder,
// it acts like inline-block or inline-table. Therefore it is a
// pseudo-stacking-context.
pseudoStackingContext = true;
awayFromCommonPath = true;
}
// dirty rect in child-relative coordinates
@ -2938,6 +3030,7 @@ nsIFrame::BuildDisplayListForChild(nsDisplayListBuilder* aBuilder,
dirty.SetEmpty();
}
pseudoStackingContext = true;
awayFromCommonPath = true;
}
NS_ASSERTION(!child->IsPlaceholderFrame(),
@ -2951,31 +3044,9 @@ nsIFrame::BuildDisplayListForChild(nsDisplayListBuilder* aBuilder,
if (aBuilder->GetIncludeAllOutOfFlows() &&
(child->GetStateBits() & NS_FRAME_OUT_OF_FLOW)) {
dirty = child->GetVisualOverflowRect();
} else if (!(child->GetStateBits() & NS_FRAME_FORCE_DISPLAY_LIST_DESCEND_INTO)) {
// No need to descend into child to catch placeholders for visible
// positioned stuff. So see if we can short-circuit frame traversal here.
// We can stop if child's frame subtree's intersection with the
// dirty area is empty.
// If the child is a scrollframe that we want to ignore, then we need
// to descend into it because its scrolled child may intersect the dirty
// area even if the scrollframe itself doesn't.
// There are cases where the "ignore scroll frame" on the builder is not set
// correctly, and so we additionally want to catch cases where the child is
// a root scrollframe and we are ignoring scrolling on the viewport.
nsIPresShell* shell = PresContext()->PresShell();
bool keepDescending = child == aBuilder->GetIgnoreScrollFrame() ||
(shell->IgnoringViewportScrolling() && child == shell->GetRootScrollFrame());
if (!keepDescending) {
nsRect childDirty;
if (!childDirty.IntersectRect(dirty, child->GetVisualOverflowRect()))
awayFromCommonPath = true;
} else if (!DescendIntoChild(aBuilder, child, dirty)) {
return;
// Usually we could set dirty to childDirty now but there's no
// benefit, and it can be confusing. It can especially confuse
// situations where we're going to ignore a scrollframe's clipping;
// we wouldn't want to clip the dirty area to the scrollframe's
// bounds in that case.
}
}
// XXX need to have inline-block and inline-table set pseudoStackingContext
@ -2992,6 +3063,7 @@ nsIFrame::BuildDisplayListForChild(nsDisplayListBuilder* aBuilder,
// within the displayport.
if (aBuilder->IsPaintingToWindow() && child->TrackingVisibility()) {
child->PresContext()->PresShell()->EnsureFrameInApproximatelyVisibleList(child);
awayFromCommonPath = true;
}
// Child is composited if it's transformed, partially transparent, or has
@ -3023,6 +3095,7 @@ nsIFrame::BuildDisplayListForChild(nsDisplayListBuilder* aBuilder,
(aFlags & DISPLAY_CHILD_FORCE_STACKING_CONTEXT)) {
// If you change this, also change IsPseudoStackingContextFromStyle()
pseudoStackingContext = true;
awayFromCommonPath = true;
}
NS_ASSERTION(!isStackingContext || pseudoStackingContext,
"Stacking contexts must also be pseudo-stacking-contexts");
@ -3040,6 +3113,7 @@ nsIFrame::BuildDisplayListForChild(nsDisplayListBuilder* aBuilder,
savedOutOfFlowData->mContainingBlockClipChain);
asrSetter.SetCurrentActiveScrolledRoot(
savedOutOfFlowData->mContainingBlockActiveScrolledRoot);
MOZ_ASSERT(awayFromCommonPath, "It is impossible when savedOutOfFlowData is true");
} else if (GetStateBits() & NS_FRAME_FORCE_DISPLAY_LIST_DESCEND_INTO &&
isPlaceholder) {
NS_ASSERTION(dirty.IsEmpty(), "should have empty dirty rect");
@ -3053,6 +3127,7 @@ nsIFrame::BuildDisplayListForChild(nsDisplayListBuilder* aBuilder,
// instead since we know we won't render anything, and the inner out-of-flow
// frame will setup the correct clip for itself.
clipState.SetClipChainForContainingBlockDescendants(nullptr);
awayFromCommonPath = true;
}
// Setup clipping for the parent's overflow:-moz-hidden-unscrollable,
@ -3066,7 +3141,9 @@ nsIFrame::BuildDisplayListForChild(nsDisplayListBuilder* aBuilder,
nsIFrame* parent = child->GetParent();
const nsStyleDisplay* parentDisp =
parent == this ? ourDisp : parent->StyleDisplay();
ApplyOverflowClipping(aBuilder, parent, parentDisp, clipState);
if (ApplyOverflowClipping(aBuilder, parent, parentDisp, clipState)) {
awayFromCommonPath = true;
}
nsDisplayList list;
nsDisplayList extraPositionedDescendants;
@ -3089,6 +3166,7 @@ nsIFrame::BuildDisplayListForChild(nsDisplayListBuilder* aBuilder,
dirty.IntersectRect(dirty, *clipPropClip);
clipState.ClipContentDescendants(
*clipPropClip + aBuilder->ToReferenceFrame(child));
awayFromCommonPath = true;
}
child->MarkAbsoluteFramesForDisplayList(aBuilder, dirty);
@ -3114,6 +3192,12 @@ nsIFrame::BuildDisplayListForChild(nsDisplayListBuilder* aBuilder,
if (eventRegions) {
eventRegions->AddFrame(aBuilder, child);
}
if (!awayFromCommonPath &&
aBuilder->IsPaintingToWindow() &&
!buildingForChild.MaybeAnimatedGeometryRoot()) {
// The shortcut is available for the child for next time.
child->AddStateBits(NS_FRAME_SIMPLE_DISPLAYLIST);
}
}
}

4
layout/generic/nsFrameStateBits.h
Просмотреть файл

@ -273,6 +273,10 @@ FRAME_STATE_BIT(Generic, 55, NS_FRAME_OWNS_ANON_BOXES)
// Frame has properties in the nsIFrame::Properties() hash.
FRAME_STATE_BIT(Generic, 56, NS_FRAME_HAS_PROPERTIES)
// The display list of the frame can be handled by the shortcut for
// COMMON CASE.
FRAME_STATE_BIT(Generic, 57, NS_FRAME_SIMPLE_DISPLAYLIST)
// Set for all descendants of MathML sub/supscript elements (other than the
// base frame) to indicate that the SSTY font feature should be used.
FRAME_STATE_BIT(Generic, 58, NS_FRAME_MATHML_SCRIPT_DESCENDANT)

68
layout/painting/nsDisplayList.cpp
Просмотреть файл

@ -973,7 +973,7 @@ AnimatedGeometryRoot*
nsDisplayListBuilder::WrapAGRForFrame(nsIFrame* aAnimatedGeometryRoot,
AnimatedGeometryRoot* aParent /* = nullptr */)
{
MOZ_ASSERT(IsAnimatedGeometryRoot(aAnimatedGeometryRoot));
MOZ_ASSERT(IsAnimatedGeometryRoot(aAnimatedGeometryRoot) == AGR_YES);
AnimatedGeometryRoot* result = nullptr;
if (!mFrameToAnimatedGeometryRootMap.Get(aAnimatedGeometryRoot, &result)) {
@ -1477,72 +1477,94 @@ IsStickyFrameActive(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame, nsIFrame*
return sf->IsScrollingActive(aBuilder) && sf->GetScrolledFrame() == cursor;
}
bool
nsDisplayListBuilder::IsAnimatedGeometryRoot(nsIFrame* aFrame, nsIFrame** aParent)
nsDisplayListBuilder::AGRState
nsDisplayListBuilder::IsAnimatedGeometryRoot(nsIFrame* aFrame,
nsIFrame** aParent)
{
if (aFrame == mReferenceFrame) {
return true;
return AGR_YES;
}
if (!IsPaintingToWindow()) {
if (aParent) {
*aParent = nsLayoutUtils::GetCrossDocParentFrame(aFrame);
}
return false;
return AGR_NO;
}
if (nsLayoutUtils::IsPopup(aFrame))
return true;
return AGR_YES;
if (ActiveLayerTracker::IsOffsetOrMarginStyleAnimated(aFrame)) {
const bool inBudget = AddToAGRBudget(aFrame);
if (inBudget) {
return true;
return AGR_YES;
}
}
if (!aFrame->GetParent() &&
nsLayoutUtils::ViewportHasDisplayPort(aFrame->PresContext())) {
// Viewport frames in a display port need to be animated geometry roots
// for background-attachment:fixed elements.
return true;
return AGR_YES;
}
if (aFrame->IsTransformed()) {
return true;
return AGR_YES;
}
nsIFrame* parent = nsLayoutUtils::GetCrossDocParentFrame(aFrame);
if (!parent)
return true;
return AGR_YES;
bool maybe = false; // Possible to transition from not being an AGR
// to being an AGR without a style change.
LayoutFrameType parentType = parent->Type();
// Treat the slider thumb as being as an active scrolled root when it wants
// its own layer so that it can move without repainting.
if (parentType == LayoutFrameType::Slider &&
nsLayoutUtils::IsScrollbarThumbLayerized(aFrame)) {
return true;
if (parentType == LayoutFrameType::Slider) {
if (nsLayoutUtils::IsScrollbarThumbLayerized(aFrame)) {
return AGR_YES;
}
maybe = true;
}
if (aFrame->StyleDisplay()->mPosition == NS_STYLE_POSITION_STICKY &&
IsStickyFrameActive(this, aFrame, parent))
{
return true;
if (aFrame->StyleDisplay()->mPosition == NS_STYLE_POSITION_STICKY) {
if (IsStickyFrameActive(this, aFrame, parent)) {
return AGR_YES;
}
maybe = true;
}
if (parentType == LayoutFrameType::Scroll ||
parentType == LayoutFrameType::ListControl) {
nsIScrollableFrame* sf = do_QueryFrame(parent);
if (sf->IsScrollingActive(this) && sf->GetScrolledFrame() == aFrame) {
return true;
if (sf->GetScrolledFrame() == aFrame) {
if (sf->IsScrollingActive(this)) {
return AGR_YES;
}
maybe = true;
}
}
// Fixed-pos frames are parented by the viewport frame, which has no parent.
if (nsLayoutUtils::IsFixedPosFrameInDisplayPort(aFrame)) {
return true;
return AGR_YES;
}
if ((aFrame->GetStateBits() & NS_FRAME_MAY_BE_TRANSFORMED) &&
aFrame->IsFrameOfType(nsIFrame::eSVG)) {
// For SVG containers, they always have
// NS_FRAME_MAY_BE_TRANSFORMED bit. However, they would be
// affected by the fragement identifiers in the svgView form at
// runtime without a new style context.
// For example, layout/reftests/svg/fragmentIdentifier-01.xhtml
//
// see https://www.w3.org/TR/SVG/linking.html#SVGFragmentIdentifiers
maybe = true;
}
if (aParent) {
*aParent = parent;
}
return false;
return !maybe ? AGR_NO : AGR_MAYBE;
}
nsIFrame*
@ -1552,7 +1574,7 @@ nsDisplayListBuilder::FindAnimatedGeometryRootFrameFor(nsIFrame* aFrame)
nsIFrame* cursor = aFrame;
while (cursor != RootReferenceFrame()) {
nsIFrame* next;
if (IsAnimatedGeometryRoot(cursor, &next))
if (IsAnimatedGeometryRoot(cursor, &next) == AGR_YES)
return cursor;
cursor = next;
}
@ -1563,7 +1585,7 @@ void
nsDisplayListBuilder::RecomputeCurrentAnimatedGeometryRoot()
{
if (*mCurrentAGR != mCurrentFrame &&
IsAnimatedGeometryRoot(const_cast<nsIFrame*>(mCurrentFrame))) {
IsAnimatedGeometryRoot(const_cast<nsIFrame*>(mCurrentFrame)) == AGR_YES) {
AnimatedGeometryRoot* oldAGR = mCurrentAGR;
mCurrentAGR = WrapAGRForFrame(const_cast<nsIFrame*>(mCurrentFrame), mCurrentAGR);

22
layout/painting/nsDisplayList.h
Просмотреть файл

@ -283,6 +283,15 @@ class nsDisplayListBuilder {
nsRect mDirtyRect;
};
/**
* A frame can be in one of three states of AGR.
* AGR_NO means the frame is not an AGR for now.
* AGR_YES means the frame is an AGR for now.
* AGR_MAYBE means the frame is not an AGR for now, but a transition
* to AGR_YES without restyling is possible.
*/
enum AGRState { AGR_NO, AGR_YES, AGR_MAYBE };
public:
typedef mozilla::FrameLayerBuilder FrameLayerBuilder;
typedef mozilla::DisplayItemClip DisplayItemClip;
@ -818,8 +827,9 @@ public:
aBuilder->FindReferenceFrameFor(aForChild,
&aBuilder->mCurrentOffsetToReferenceFrame);
}
mCurrentAGRState = aBuilder->IsAnimatedGeometryRoot(aForChild);
if (aBuilder->mCurrentFrame == aForChild->GetParent()) {
if (aBuilder->IsAnimatedGeometryRoot(aForChild)) {
if (mCurrentAGRState == AGR_YES) {
aBuilder->mCurrentAGR = aBuilder->WrapAGRForFrame(aForChild, aBuilder->mCurrentAGR);
}
} else if (aForChild != aBuilder->mCurrentFrame) {
@ -843,8 +853,10 @@ public:
return mPrevAnimatedGeometryRoot;
}
bool IsAnimatedGeometryRoot() const {
return *mBuilder->mCurrentAGR == mBuilder->mCurrentFrame;
return mCurrentAGRState == AGR_YES;
}
bool MaybeAnimatedGeometryRoot() const {
return mCurrentAGRState == AGR_MAYBE;
}
void RestoreBuildingInvisibleItemsValue() {
mBuilder->mBuildingInvisibleItems = mPrevBuildingInvisibleItems;
@ -862,6 +874,7 @@ public:
}
private:
nsDisplayListBuilder* mBuilder;
AGRState mCurrentAGRState;
const nsIFrame* mPrevFrame;
const nsIFrame* mPrevReferenceFrame;
nsIFrame* mPrevAnimatedGeometryRoot;
@ -1398,7 +1411,8 @@ private:
* Returns whether a frame acts as an animated geometry root, optionally
* returning the next ancestor to check.
*/
bool IsAnimatedGeometryRoot(nsIFrame* aFrame, nsIFrame** aParent = nullptr);
AGRState IsAnimatedGeometryRoot(nsIFrame* aFrame,
nsIFrame** aParent = nullptr);
/**
* Returns the nearest ancestor frame to aFrame that is considered to have