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Track which frames were float continuations that need to be pulled to the next block rather than figuring it out again when it's time to pull them. (This allows first-in-flows to be float continuations.) (Bug 563584, patch 12) r=roc

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This commit is contained in:
L. David Baron 2010-08-05 21:59:19 -07:00
parent 7c80834b1e
commit 99f4849c65
4 changed files with 101 additions and 58 deletions
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116
layout/generic/nsBlockFrame.cpp
View File

@ -1014,8 +1014,9 @@ nsBlockFrame::Reflow(nsPresContext* aPresContext,
NS_MergeReflowStatusInto(&state.mReflowStatus, fcStatus);
// Put continued floats at the end of mFloats
if (state.mFloatContinuations.NotEmpty())
if (state.mFloatContinuations.NotEmpty()) {
mFloats.AppendFrames(nsnull, state.mFloatContinuations);
}
// If we end in a BR with clear and affected floats continue,
// we need to continue, too.
@ -1768,7 +1769,8 @@ nsBlockFrame::ReflowDirtyLines(nsBlockReflowState& aState)
// reflow it or if its previous margin is dirty
PRBool needToRecoverState = PR_FALSE;
// Float continuations were reflowed in ReflowFloatContinuations
PRBool reflowedFloat = mFloats.NotEmpty() && mFloats.FirstChild()->GetPrevInFlow();
PRBool reflowedFloat = mFloats.NotEmpty() &&
(mFloats.FirstChild()->GetStateBits() & NS_FRAME_IS_FLOAT_CONTINUATION);
PRBool lastLineMovedUp = PR_FALSE;
// We save up information about BR-clearance here
PRUint8 inlineFloatBreakType = aState.mFloatBreakType;
@ -3894,8 +3896,16 @@ nsBlockFrame::SplitFloat(nsBlockReflowState& aState,
nsIFrame* aFloat,
nsReflowStatus aFloatStatus)
{
nsIFrame* nextInFlow = nsnull;
if (!aFloat->GetNextInFlow()) {
nsIFrame* nextInFlow = aFloat->GetNextInFlow();
if (nextInFlow) {
nsContainerFrame *oldParent =
static_cast<nsContainerFrame*>(nextInFlow->GetParent());
nsresult rv = oldParent->StealFrame(aState.mPresContext, nextInFlow);
NS_ASSERTION(NS_SUCCEEDED(rv), "StealFrame failed");
if (oldParent != this) {
ReparentFrame(nextInFlow, oldParent, this);
}
} else {
nsresult rv = aState.mPresContext->PresShell()->FrameConstructor()->
CreateContinuingFrame(aState.mPresContext, aFloat, this, &nextInFlow);
NS_ENSURE_SUCCESS(rv, rv);
@ -3916,10 +3926,7 @@ nsBlockFrame::SplitFloat(nsBlockReflowState& aState,
aState.mFloatManager->SetSplitRightFloatAcrossBreak();
}
if (nextInFlow) {
// Next in flow was created above.
aState.AppendFloatContinuation(nextInFlow);
}
return NS_OK;
}
@ -3936,8 +3943,12 @@ GetLastFloat(nsLineBox* aLine)
static PRBool
CheckPlaceholderInLine(nsIFrame* aBlock, nsLineBox* aLine, nsFloatCache* aFC)
{
if (!aFC || aFC->mFloat->GetPrevInFlow())
if (!aFC)
return PR_TRUE;
NS_ASSERTION(!aFC->mFloat->GetPrevContinuation(),
"float in a line should never be a continuation");
NS_ASSERTION(!(aFC->mFloat->GetStateBits() & NS_FRAME_IS_FLOAT_CONTINUATION),
"float in a line should never be a pushed float");
nsIFrame* ph = aBlock->PresContext()->FrameManager()->
GetPlaceholderFrameFor(aFC->mFloat->GetFirstInFlow());
for (nsIFrame* f = ph; f; f = f->GetParent()) {
@ -4435,53 +4446,56 @@ nsBlockFrame::DrainOverflowLines(nsBlockReflowState& aState)
}
// This function assumes our prev-in-flow has completed reflow and its
// mFloats contains at most two frames that belong to the same flow chain,
// the second one being a last-in-flow continuation intended for this block.
// mFloats may contain frames at the end of its float list, marked with
// NS_FRAME_IS_FLOAT_CONTINUATION, that should be pulled to this block.
void
nsBlockFrame::DrainFloatContinuations(nsBlockReflowState& aState)
{
// Cache any continuations of our own floats that we're still holding onto
// so they're out of the way. This should only happen if we're re-Reflow'd
// before our next-in-flow gets a chance to pull these continuations.
nsFrameList floatContinuations;
nsPresContext* presContext = PresContext();
for (nsIFrame* f = mFloats.FirstChild(); f; f = f->GetNextSibling()) {
nsIFrame* nif = f->GetNextInFlow();
if (!nif) continue;
if (nif->GetParent() == this) {
NS_ASSERTION(!nif->GetNextInFlow(),
"Unexpected next-in-flow for float continuation");
StealFrame(presContext, nif);
floatContinuations.AppendFrame(nsnull, nif);
}
}
if (floatContinuations.NotEmpty()) {
// However, if it's a "continuation" that's not actually a continuation,
// put it back on the floats list.
// FIXME: This is not compatible with doing float breaking in dynamic
// situations, since in those situations we could have current
// continuations at the end of our float list that were actually
// continuations from a previous frame to this one. (However, it's
// not clear to me that we really need this code in the first place;
// the best solution might just be to remove it.)
nsIFrame *f = mFloats.LastChild();
if (f && (f->GetStateBits() & NS_FRAME_IS_FLOAT_CONTINUATION)) {
do {
f = f->GetPrevSibling();
} while (f && (f->GetStateBits() & NS_FRAME_IS_FLOAT_CONTINUATION));
aState.SetupFloatContinuationList();
aState.mFloatContinuations.AppendFrames(nsnull, floatContinuations);
// RemoveFramesAfter(nsnull) removes the whole list
nsFrameList floatContinuations = mFloats.RemoveFramesAfter(f);
while (floatContinuations.NotEmpty()) {
nsIFrame *f = floatContinuations.RemoveFirstChild();
if (f->GetPrevContinuation()) {
aState.mFloatContinuations.AppendFrame(nsnull, f);
} else {
f->RemoveStateBits(NS_FRAME_IS_FLOAT_CONTINUATION);
mFloats.AppendFrame(nsnull, f);
}
}
}
// Walk our prev-in-flow's floats and prepend their continuations to our
// floats list. This pulls any continuations we need to take from our
// prev-in-flow and makes sure our continuations of its floats are in the
// proper order.
// Take any continuations we need to take from our prev-in-flow.
nsBlockFrame* prevBlock = static_cast<nsBlockFrame*>(GetPrevInFlow());
if (!prevBlock)
return;
for (nsIFrame* pf = prevBlock->mFloats.FirstChild(); pf; pf = pf->GetNextSibling()) {
nsIFrame* nif = pf->GetNextInFlow();
if (!nif)
continue;
nsContainerFrame* nifParent = static_cast<nsContainerFrame*>(nif->GetParent());
nifParent->StealFrame(presContext, nif);
if (nif->GetParent() != this) {
NS_ASSERTION(!nif->GetNextInFlow(),
"Unexpected next-in-flow for float continuation");
ReparentFrame(nif, nifParent, this);
}
floatContinuations.AppendFrame(this, nif);
}
if (floatContinuations.NotEmpty())
f = prevBlock->mFloats.LastChild();
if (f && (f->GetStateBits() & NS_FRAME_IS_FLOAT_CONTINUATION)) {
do {
ReparentFrame(f, prevBlock, this);
f = f->GetPrevSibling();
} while (f && (f->GetStateBits() & NS_FRAME_IS_FLOAT_CONTINUATION));
// RemoveFramesAfter(nsnull) removes the whole list
nsFrameList floatContinuations = prevBlock->mFloats.RemoveFramesAfter(f);
mFloats.InsertFrames(nsnull, nsnull, floatContinuations);
}
#ifdef DEBUG
for (nsIFrame* f = mFloats.FirstChild(); f ; f = f->GetNextSibling()) {
@ -5719,7 +5733,8 @@ nsBlockFrame::ReflowFloatContinuations(nsBlockReflowState& aState,
nsReflowStatus& aStatus)
{
nsresult rv = NS_OK;
for (nsIFrame* f = mFloats.FirstChild(); f && f->GetPrevInFlow();
for (nsIFrame* f = mFloats.FirstChild();
f && (f->GetStateBits() & NS_FRAME_IS_FLOAT_CONTINUATION);
f = f->GetNextSibling()) {
if (NS_SUBTREE_DIRTY(f) || aState.mReflowState.ShouldReflowAllKids()) {
// Cache old bounds
@ -6044,7 +6059,7 @@ nsBlockFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
if (GetPrevInFlow()) {
DisplayOverflowContainers(aBuilder, aDirtyRect, aLists);
for (nsIFrame* f = mFloats.FirstChild(); f; f = f->GetNextSibling()) {
if (f->GetPrevInFlow())
if (f->GetStateBits() & NS_FRAME_IS_FLOAT_CONTINUATION)
BuildDisplayListForChild(aBuilder, f, aDirtyRect, aLists);
}
}
@ -6664,6 +6679,16 @@ void nsBlockFrame::CollectFloats(nsIFrame* aFrame, nsFrameList& aList,
aFrame->GetType() == nsGkAtoms::placeholderFrame ?
nsLayoutUtils::GetFloatFromPlaceholder(aFrame) : nsnull;
if (outOfFlowFrame) {
if (outOfFlowFrame->GetStateBits() & NS_FRAME_IS_FLOAT_CONTINUATION) {
if (outOfFlowFrame->GetParent() == this) {
nsFrameList* list = GetPropTableFrames(PresContext(),
FloatContinuationProperty());
if (!list || !list->RemoveFrameIfPresent(outOfFlowFrame)) {
mFloats.RemoveFrame(outOfFlowFrame);
}
aList.AppendFrame(nsnull, outOfFlowFrame);
}
} else {
// Make sure that its parent is us. Otherwise we don't want
// to mess around with it because it belongs to someone
// else. I think this could happen if the overflow lines
@ -6678,6 +6703,7 @@ void nsBlockFrame::CollectFloats(nsIFrame* aFrame, nsFrameList& aList,
}
aList.AppendFrame(nsnull, outOfFlowFrame);
}
}
CollectFloats(aFrame->GetFirstChild(nsnull),
aList, aFromOverflow, PR_TRUE);
@ -6722,7 +6748,7 @@ nsBlockFrame::CheckFloats(nsBlockReflowState& aState)
PRBool equal = PR_TRUE;
PRUint32 i = 0;
for (nsIFrame* f = mFloats.FirstChild(); f; f = f->GetNextSibling()) {
if (f->GetPrevInFlow())
if (f->GetStateBits() & NS_FRAME_IS_FLOAT_CONTINUATION)
continue;
storedFloats.AppendElement(f);
if (i < lineFloats.Length() && lineFloats.ElementAt(i) != f) {

12
layout/generic/nsBlockFrame.h
View File

@ -97,7 +97,17 @@ class nsIntervalSet;
* nsBlockReflowState. This list contains continuations for
* floats whose prev-in-flow is in the block's regular float
* list. The list is always empty/nonexistent after the
* block has been reflowed.
* block has been reflowed. (However, after it has been
* reflowed and before the continuations are moved to the
* next block, they are temporarily at the end of the
* block's float list. FIXME: This temporary storage
* situation is not compatible with doing float breaking in
* dynamic cases, since we can't distinguish unflushed
* temporary storage (floats being transferred from the
* frame) in a case where we need a second reflow from
* frames previously transferred to the frame; fixing this
* would require an additional frame list for this temporary
* storage.)
* -- In all these frame lists, if there are two frames for
* the same content appearing in the list, then the frames
* appear with the prev-in-flow before the next-in-flow.

1
layout/generic/nsBlockReflowState.h
View File

@ -233,6 +233,7 @@ public:
// Use this method to append to mFloatContinuations.
void AppendFloatContinuation(nsIFrame* aFloatCont) {
SetupFloatContinuationList();
aFloatCont->AddStateBits(NS_FRAME_IS_FLOAT_CONTINUATION);
mFloatContinuations.AppendFrame(mBlock, aFloatCont);
}

6
layout/generic/nsIFrame.h
View File

@ -256,6 +256,12 @@ typedef PRUint64 nsFrameState;
// Bits 20-31 of the frame state are reserved for implementations.
#define NS_FRAME_IMPL_RESERVED nsFrameState(0xFFF00000)
// This bit is set on floats whose parent does not contain their
// placeholder. This can happen for two reasons: (1) the float was
// split, and this piece is the continuation, or (2) the entire float
// didn't fit on the page.
#define NS_FRAME_IS_FLOAT_CONTINUATION NS_FRAME_STATE_BIT(32)
// The lower 20 bits and upper 32 bits of the frame state are reserved
// by this API.
#define NS_FRAME_RESERVED ~NS_FRAME_IMPL_RESERVED