PRIntn
nsInlineFrame::GetSkipSides() const
{
PRIntn skip = 0;
if (!IsLeftMost()) {
nsInlineFrame* prev = (nsInlineFrame*) GetPrevContinuation();
if ((GetStateBits() & NS_INLINE_FRAME_BIDI_VISUAL_STATE_IS_SET) ||
(prev && (prev->mRect.height || prev->mRect.width))) {
// Prev continuation is not empty therefore we don't render our left
// border edge.
skip |= 1 << NS_SIDE_LEFT;
}
else {
// If the prev continuation is empty, then go ahead and let our left
// edge border render.
}
}
if (!IsRightMost()) {
nsInlineFrame* next = (nsInlineFrame*) GetNextContinuation();
if ((GetStateBits() & NS_INLINE_FRAME_BIDI_VISUAL_STATE_IS_SET) ||
(next && (next->mRect.height || next->mRect.width))) {
// Next continuation is not empty therefore we don't render our right
// border edge.
skip |= 1 << NS_SIDE_RIGHT;
}
else {
// If the next continuation is empty, then go ahead and let our right
// edge border render.
}
}
if (GetStateBits() & NS_FRAME_IS_SPECIAL) {
// All but the last part of an {ib} split should skip the "end" side (as
// determined by this frame's direction) and all but the first part of such
// a split should skip the "start" side. But figuring out which part of
// the split we are involves getting our first continuation, which might be
// expensive. So don't bother if we already have the relevant bits set.
PRBool ltr = (NS_STYLE_DIRECTION_LTR == GetStyleVisibility()->mDirection);
PRIntn startBit = (1 << (ltr ? NS_SIDE_LEFT : NS_SIDE_RIGHT));
PRIntn endBit = (1 << (ltr ? NS_SIDE_RIGHT : NS_SIDE_LEFT));
if (((startBit | endBit) & skip) != (startBit | endBit)) {
// We're missing one of the skip bits, so check whether we need to set it.
// Only get the first continuation once, as an optimization.
nsIFrame* firstContinuation = GetFirstContinuation();
if (nsLayoutUtils::FrameIsNonLastInIBSplit(firstContinuation)) {
skip |= endBit;
}
if (nsLayoutUtils::FrameIsNonFirstInIBSplit(firstContinuation)) {
skip |= startBit;
}
}
}
return skip;
}
/* virtual */ PRBool
nsInlineFrame::IsSelfEmpty()
{
#if 0
// I used to think inline frames worked this way, but it seems they
// don't. At least not in our codebase.
if (GetPresContext()->CompatibilityMode() == eCompatibility_FullStandards) {
return PR_FALSE;
}
#endif
const nsStyleMargin* margin = GetStyleMargin();
const nsStyleBorder* border = GetStyleBorder();
const nsStylePadding* padding = GetStylePadding();
// XXX Top and bottom removed, since they shouldn't affect things, but this
// doesn't really match with nsLineLayout.cpp's setting of
// ZeroEffectiveSpanBox, anymore, so what should this really be?
PRBool haveRight =
border->GetActualBorderWidth(NS_SIDE_RIGHT) != 0 ||
!IsPaddingZero(padding->mPadding.GetRightUnit(),
padding->mPadding.GetRight()) ||
!IsMarginZero(margin->mMargin.GetRightUnit(),
margin->mMargin.GetRight());
PRBool haveLeft =
border->GetActualBorderWidth(NS_SIDE_LEFT) != 0 ||
!IsPaddingZero(padding->mPadding.GetLeftUnit(),
padding->mPadding.GetLeft()) ||
!IsMarginZero(margin->mMargin.GetLeftUnit(),
margin->mMargin.GetLeft());
if (haveLeft || haveRight) {
if (GetStateBits() & NS_FRAME_IS_SPECIAL) {
PRBool haveStart, haveEnd;
if (NS_STYLE_DIRECTION_LTR == GetStyleVisibility()->mDirection) {
haveStart = haveLeft;
haveEnd = haveRight;
} else {
haveStart = haveRight;
haveEnd = haveLeft;
}
// For special frames, ignore things we know we'll skip in GetSkipSides.
// XXXbz should we be doing this for non-special frames too, in a more
// general way?
// Get the first continuation eagerly, as a performance optimization, to
// avoid having to get it twice..
nsIFrame* firstCont = GetFirstContinuation();
return
(!haveStart || nsLayoutUtils::FrameIsInLastPartOfIBSplit(firstCont)) &&
(!haveEnd || nsLayoutUtils::FrameIsInFirstPartOfIBSplit(firstCont));
}
return PR_FALSE;
}
return PR_TRUE;
}
NS_IMETHODIMP
CVE_2013_1732_firefox12_0_nsBlockFrame::Reflow(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aMetrics,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus)
{
DO_GLOBAL_REFLOW_COUNT("nsBlockFrame");
DISPLAY_REFLOW(aPresContext, this, aReflowState, aMetrics, aStatus);
#ifdef DEBUG
if (gNoisyReflow) {
IndentBy(stdout, gNoiseIndent);
ListTag(stdout);
printf(": begin reflow availSize=%d,%d computedSize=%d,%d\n",
aReflowState.availableWidth, aReflowState.availableHeight,
aReflowState.ComputedWidth(), aReflowState.ComputedHeight());
}
AutoNoisyIndenter indent(gNoisy);
PRTime start = LL_ZERO; // Initialize these variablies to silence the compiler.
PRInt32 ctc = 0; // We only use these if they are set (gLameReflowMetrics).
if (gLameReflowMetrics) {
start = PR_Now();
ctc = nsLineBox::GetCtorCount();
}
#endif
const nsHTMLReflowState *reflowState = &aReflowState;
nsAutoPtr<nsHTMLReflowState> mutableReflowState;
// If we have non-auto height, we're clipping our kids and we fit,
// make sure our kids fit too.
if (aReflowState.availableHeight != NS_UNCONSTRAINEDSIZE &&
aReflowState.ComputedHeight() != NS_AUTOHEIGHT &&
ApplyOverflowClipping(this, aReflowState.mStyleDisplay)) {
nsMargin heightExtras = aReflowState.mComputedBorderPadding;
if (GetSkipSides() & NS_SIDE_TOP) {
heightExtras.top = 0;
} else {
// Bottom margin never causes us to create continuations, so we
// don't need to worry about whether it fits in its entirety.
heightExtras.top += aReflowState.mComputedMargin.top;
}
if (GetEffectiveComputedHeight(aReflowState) + heightExtras.TopBottom() <=
aReflowState.availableHeight) {
mutableReflowState = new nsHTMLReflowState(aReflowState);
mutableReflowState->availableHeight = NS_UNCONSTRAINEDSIZE;
reflowState = mutableReflowState;
}
}
// See comment below about oldSize. Use *only* for the
// abs-pos-containing-block-size-change optimization!
nsSize oldSize = GetSize();
// Should we create a float manager?
nsAutoFloatManager autoFloatManager(const_cast<nsHTMLReflowState&>(*reflowState));
// XXXldb If we start storing the float manager in the frame rather
// than keeping it around only during reflow then we should create it
// only when there are actually floats to manage. Otherwise things
// like tables will gain significant bloat.
bool needFloatManager = nsBlockFrame::BlockNeedsFloatManager(this);
if (needFloatManager)
autoFloatManager.CreateFloatManager(aPresContext);
// OK, some lines may be reflowed. Blow away any saved line cursor
// because we may invalidate the nondecreasing
// overflowArea.VisualOverflow().y/yMost invariant, and we may even
// delete the line with the line cursor.
ClearLineCursor();
if (IsFrameTreeTooDeep(*reflowState, aMetrics, aStatus)) {
return NS_OK;
}
bool marginRoot = BlockIsMarginRoot(this);
nsBlockReflowState state(*reflowState, aPresContext, this, aMetrics,
marginRoot, marginRoot, needFloatManager);
#ifdef IBMBIDI
if (GetStateBits() & NS_BLOCK_NEEDS_BIDI_RESOLUTION)
static_cast<nsBlockFrame*>(GetFirstContinuation())->ResolveBidi();
#endif // IBMBIDI
if (RenumberLists(aPresContext)) {
AddStateBits(NS_FRAME_HAS_DIRTY_CHILDREN);
}
nsresult rv = NS_OK;
// ALWAYS drain overflow. We never want to leave the previnflow's
// overflow lines hanging around; block reflow depends on the
// overflow line lists being cleared out between reflow passes.
DrainOverflowLines();
// Handle paginated overflow (see nsContainerFrame.h)
nsOverflowAreas ocBounds;
nsReflowStatus ocStatus = NS_FRAME_COMPLETE;
if (GetPrevInFlow()) {
ReflowOverflowContainerChildren(aPresContext, *reflowState, ocBounds, 0,
ocStatus);
}
// Now that we're done cleaning up our overflow container lists, we can
// give |state| its nsOverflowContinuationTracker.
nsOverflowContinuationTracker tracker(aPresContext, this, false);
state.mOverflowTracker = &tracker;
// Drain & handle pushed floats
DrainPushedFloats(state);
nsOverflowAreas fcBounds;
nsReflowStatus fcStatus = NS_FRAME_COMPLETE;
rv = ReflowPushedFloats(state, fcBounds, fcStatus);
NS_ENSURE_SUCCESS(rv, rv);
// If we're not dirty (which means we'll mark everything dirty later)
// and our width has changed, mark the lines dirty that we need to
// mark dirty for a resize reflow.
if (reflowState->mFlags.mHResize)
PrepareResizeReflow(state);
mState &= ~NS_FRAME_FIRST_REFLOW;
// Now reflow...
rv = ReflowDirtyLines(state);
NS_ASSERTION(NS_SUCCEEDED(rv), "reflow dirty lines failed");
if (NS_FAILED(rv)) return rv;
NS_MergeReflowStatusInto(&state.mReflowStatus, ocStatus);
NS_MergeReflowStatusInto(&state.mReflowStatus, fcStatus);
// If we end in a BR with clear and affected floats continue,
// we need to continue, too.
if (NS_UNCONSTRAINEDSIZE != reflowState->availableHeight &&
NS_FRAME_IS_COMPLETE(state.mReflowStatus) &&
state.mFloatManager->ClearContinues(FindTrailingClear())) {
NS_FRAME_SET_INCOMPLETE(state.mReflowStatus);
}
if (!NS_FRAME_IS_FULLY_COMPLETE(state.mReflowStatus)) {
if (GetOverflowLines() || GetPushedFloats()) {
state.mReflowStatus |= NS_FRAME_REFLOW_NEXTINFLOW;
}
#ifdef DEBUG_kipp
ListTag(stdout); printf(": block is not fully complete\n");
#endif
}
CheckFloats(state);
// Place the "marker" (bullet) frame if it is placed next to a block
// child.
//
// According to the CSS2 spec, section 12.6.1, the "marker" box
// participates in the height calculation of the list-item box's
// first line box.
//
// There are exactly two places a bullet can be placed: near the
// first or second line. It's only placed on the second line in a
// rare case: an empty first line followed by a second line that
// contains a block (example: <LI>\n<P>... ). This is where
// the second case can happen.
if (mBullet && HaveOutsideBullet() && !mLines.empty() &&
(mLines.front()->IsBlock() ||
(0 == mLines.front()->mBounds.height &&
mLines.front() != mLines.back() &&
mLines.begin().next()->IsBlock()))) {
// Reflow the bullet
nsHTMLReflowMetrics metrics;
// XXX Use the entire line when we fix bug 25888.
nsLayoutUtils::LinePosition position;
bool havePosition = nsLayoutUtils::GetFirstLinePosition(this, &position);
nscoord lineTop = havePosition ? position.mTop
: reflowState->mComputedBorderPadding.top;
ReflowBullet(state, metrics, lineTop);
NS_ASSERTION(!BulletIsEmpty() || metrics.height == 0,
"empty bullet took up space");
if (havePosition && !BulletIsEmpty()) {
// We have some lines to align the bullet with.
// Doing the alignment using the baseline will also cater for
// bullets that are placed next to a child block (bug 92896)
// Tall bullets won't look particularly nice here...
nsRect bbox = mBullet->GetRect();
bbox.y = position.mBaseline - metrics.ascent;
mBullet->SetRect(bbox);
}
// Otherwise just leave the bullet where it is, up against our top padding.
}
// Compute our final size
nscoord bottomEdgeOfChildren;
ComputeFinalSize(*reflowState, state, aMetrics, &bottomEdgeOfChildren);
nsRect areaBounds = nsRect(0, 0, aMetrics.width, aMetrics.height);
ComputeOverflowAreas(areaBounds, reflowState->mStyleDisplay,
bottomEdgeOfChildren, aMetrics.mOverflowAreas);
// Factor overflow container child bounds into the overflow area
aMetrics.mOverflowAreas.UnionWith(ocBounds);
// Factor pushed float child bounds into the overflow area
aMetrics.mOverflowAreas.UnionWith(fcBounds);
// Let the absolutely positioned container reflow any absolutely positioned
// child frames that need to be reflowed, e.g., elements with a percentage
// based width/height
// We want to do this under either of two conditions:
// 1. If we didn't do the incremental reflow above.
// 2. If our size changed.
// Even though it's the padding edge that's the containing block, we
// can use our rect (the border edge) since if the border style
// changed, the reflow would have been targeted at us so we'd satisfy
// condition 1.
// XXX checking oldSize is bogus, there are various reasons we might have
// reflowed but our size might not have been changed to what we
// asked for (e.g., we ended up being pushed to a new page)
// When WillReflowAgainForClearance is true, we will reflow again without
// resetting the size. Because of this, we must not reflow our abs-pos children
// in that situation --- what we think is our "new size"
// will not be our real new size. This also happens to be more efficient.
if (HasAbsolutelyPositionedChildren()) {
nsAbsoluteContainingBlock* absoluteContainer = GetAbsoluteContainingBlock();
bool haveInterrupt = aPresContext->HasPendingInterrupt();
if (reflowState->WillReflowAgainForClearance() ||
haveInterrupt) {
// Make sure that when we reflow again we'll actually reflow all the abs
// pos frames that might conceivably depend on our size (or all of them,
// if we're dirty right now and interrupted; in that case we also need
// to mark them all with NS_FRAME_IS_DIRTY). Sadly, we can't do much
// better than that, because we don't really know what our size will be,
// and it might in fact not change on the followup reflow!
if (haveInterrupt && (GetStateBits() & NS_FRAME_IS_DIRTY)) {
absoluteContainer->MarkAllFramesDirty();
} else {
absoluteContainer->MarkSizeDependentFramesDirty();
}
} else {
nsSize containingBlockSize =
CalculateContainingBlockSizeForAbsolutes(*reflowState,
nsSize(aMetrics.width,
aMetrics.height));
// Mark frames that depend on changes we just made to this frame as dirty:
// Now we can assume that the padding edge hasn't moved.
// We need to reflow the absolutes if one of them depends on
// its placeholder position, or the containing block size in a
// direction in which the containing block size might have
// changed.
bool cbWidthChanged = aMetrics.width != oldSize.width;
bool isRoot = !GetContent()->GetParent();
// If isRoot and we have auto height, then we are the initial
// containing block and the containing block height is the
// viewport height, which can't change during incremental
// reflow.
bool cbHeightChanged =
!(isRoot && NS_UNCONSTRAINEDSIZE == reflowState->ComputedHeight()) &&
aMetrics.height != oldSize.height;
absoluteContainer->Reflow(this, aPresContext, *reflowState,
state.mReflowStatus,
containingBlockSize.width,
containingBlockSize.height, true,
cbWidthChanged, cbHeightChanged,
&aMetrics.mOverflowAreas);
//XXXfr Why isn't this rv (and others in this file) checked/returned?
}
}
// Determine if we need to repaint our border, background or outline
CheckInvalidateSizeChange(aMetrics);
FinishAndStoreOverflow(&aMetrics);
// Clear the float manager pointer in the block reflow state so we
// don't waste time translating the coordinate system back on a dead
// float manager.
if (needFloatManager)
state.mFloatManager = nsnull;
aStatus = state.mReflowStatus;
#ifdef DEBUG
// Between when we drain pushed floats and when we complete reflow,
// we're allowed to have multiple continuations of the same float on
// our floats list, since a first-in-flow might get pushed to a later
// continuation of its containing block. But it's not permitted
// outside that time.
nsLayoutUtils::AssertNoDuplicateContinuations(this, mFloats);
if (gNoisyReflow) {
IndentBy(stdout, gNoiseIndent);
ListTag(stdout);
printf(": status=%x (%scomplete) metrics=%d,%d carriedMargin=%d",
aStatus, NS_FRAME_IS_COMPLETE(aStatus) ? "" : "not ",
aMetrics.width, aMetrics.height,
aMetrics.mCarriedOutBottomMargin.get());
if (HasOverflowAreas()) {
printf(" overflow-vis={%d,%d,%d,%d}",
aMetrics.VisualOverflow().x,
aMetrics.VisualOverflow().y,
aMetrics.VisualOverflow().width,
aMetrics.VisualOverflow().height);
printf(" overflow-scr={%d,%d,%d,%d}",
aMetrics.ScrollableOverflow().x,
aMetrics.ScrollableOverflow().y,
aMetrics.ScrollableOverflow().width,
aMetrics.ScrollableOverflow().height);
}
printf("\n");
}
if (gLameReflowMetrics) {
PRTime end = PR_Now();
PRInt32 ectc = nsLineBox::GetCtorCount();
PRInt32 numLines = mLines.size();
if (!numLines) numLines = 1;
PRTime delta, perLineDelta, lines;
LL_I2L(lines, numLines);
LL_SUB(delta, end, start);
LL_DIV(perLineDelta, delta, lines);
ListTag(stdout);
char buf[400];
PR_snprintf(buf, sizeof(buf),
": %lld elapsed (%lld per line) (%d lines; %d new lines)",
delta, perLineDelta, numLines, ectc - ctc);
printf("%s\n", buf);
}
#endif
NS_FRAME_SET_TRUNCATION(aStatus, (*reflowState), aMetrics);
return rv;
}