/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ /* 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/. */ /* state and methods used while laying out a single line of a block frame */ // This has to be defined before nsLineLayout.h is included, because // nsLineLayout.h has a #include for plarena.h, which needs this defined: #define PL_ARENA_CONST_ALIGN_MASK (sizeof(void*)-1) #include "nsLineLayout.h" #include "SVGTextFrame.h" #include "nsBlockFrame.h" #include "nsStyleConsts.h" #include "nsContainerFrame.h" #include "nsFloatManager.h" #include "nsStyleContext.h" #include "nsPresContext.h" #include "nsRenderingContext.h" #include "nsGkAtoms.h" #include "nsIContent.h" #include "nsLayoutUtils.h" #include "nsTextFrame.h" #include "nsStyleStructInlines.h" #include "nsBidiPresUtils.h" #include #ifdef DEBUG #undef NOISY_INLINEDIR_ALIGN #undef NOISY_BLOCKDIR_ALIGN #undef REALLY_NOISY_BLOCKDIR_ALIGN #undef NOISY_REFLOW #undef REALLY_NOISY_REFLOW #undef NOISY_PUSHING #undef REALLY_NOISY_PUSHING #undef DEBUG_ADD_TEXT #undef NOISY_MAX_ELEMENT_SIZE #undef REALLY_NOISY_MAX_ELEMENT_SIZE #undef NOISY_CAN_PLACE_FRAME #undef NOISY_TRIM #undef REALLY_NOISY_TRIM #endif using namespace mozilla; //---------------------------------------------------------------------- #define FIX_BUG_50257 nsLineLayout::nsLineLayout(nsPresContext* aPresContext, nsFloatManager* aFloatManager, const nsHTMLReflowState* aOuterReflowState, const nsLineList::iterator* aLine) : mPresContext(aPresContext), mFloatManager(aFloatManager), mBlockReflowState(aOuterReflowState), mLastOptionalBreakContent(nullptr), mForceBreakContent(nullptr), mBlockRS(nullptr),/* XXX temporary */ mLastOptionalBreakPriority(gfxBreakPriority::eNoBreak), mLastOptionalBreakContentOffset(-1), mForceBreakContentOffset(-1), mMinLineBSize(0), mTextIndent(0), mFirstLetterStyleOK(false), mIsTopOfPage(false), mImpactedByFloats(false), mLastFloatWasLetterFrame(false), mLineIsEmpty(false), mLineEndsInBR(false), mNeedBackup(false), mInFirstLine(false), mGotLineBox(false), mInFirstLetter(false), mHasBullet(false), mDirtyNextLine(false), mLineAtStart(false) { MOZ_ASSERT(aOuterReflowState, "aOuterReflowState must not be null"); NS_ASSERTION(aFloatManager || aOuterReflowState->frame->GetType() == nsGkAtoms::letterFrame, "float manager should be present"); MOZ_COUNT_CTOR(nsLineLayout); // Stash away some style data that we need nsBlockFrame* blockFrame = do_QueryFrame(aOuterReflowState->frame); if (blockFrame) mStyleText = blockFrame->StyleTextForLineLayout(); else mStyleText = aOuterReflowState->frame->StyleText(); mLineNumber = 0; mTotalPlacedFrames = 0; mBStartEdge = 0; mTrimmableWidth = 0; mInflationMinFontSize = nsLayoutUtils::InflationMinFontSizeFor(aOuterReflowState->frame); // Instead of always pre-initializing the free-lists for frames and // spans, we do it on demand so that situations that only use a few // frames and spans won't waste a lot of time in unneeded // initialization. PL_INIT_ARENA_POOL(&mArena, "nsLineLayout", 1024); mFrameFreeList = nullptr; mSpanFreeList = nullptr; mCurrentSpan = mRootSpan = nullptr; mSpanDepth = 0; if (aLine) { mGotLineBox = true; mLineBox = *aLine; } } nsLineLayout::~nsLineLayout() { MOZ_COUNT_DTOR(nsLineLayout); NS_ASSERTION(nullptr == mRootSpan, "bad line-layout user"); PL_FinishArenaPool(&mArena); } // Find out if the frame has a non-null prev-in-flow, i.e., whether it // is a continuation. inline bool HasPrevInFlow(nsIFrame *aFrame) { nsIFrame *prevInFlow = aFrame->GetPrevInFlow(); return prevInFlow != nullptr; } void nsLineLayout::BeginLineReflow(nscoord aICoord, nscoord aBCoord, nscoord aISize, nscoord aBSize, bool aImpactedByFloats, bool aIsTopOfPage, WritingMode aWritingMode, nscoord aContainerWidth) { NS_ASSERTION(nullptr == mRootSpan, "bad linelayout user"); NS_WARN_IF_FALSE(aISize != NS_UNCONSTRAINEDSIZE, "have unconstrained width; this should only result from " "very large sizes, not attempts at intrinsic width " "calculation"); #ifdef DEBUG if ((aISize != NS_UNCONSTRAINEDSIZE) && CRAZY_SIZE(aISize)) { nsFrame::ListTag(stdout, mBlockReflowState->frame); printf(": Init: bad caller: width WAS %d(0x%x)\n", aISize, aISize); } if ((aBSize != NS_UNCONSTRAINEDSIZE) && CRAZY_SIZE(aBSize)) { nsFrame::ListTag(stdout, mBlockReflowState->frame); printf(": Init: bad caller: height WAS %d(0x%x)\n", aBSize, aBSize); } #endif #ifdef NOISY_REFLOW nsFrame::ListTag(stdout, mBlockReflowState->frame); printf(": BeginLineReflow: %d,%d,%d,%d impacted=%s %s\n", aICoord, aBCoord, aISize, aBSize, aImpactedByFloats?"true":"false", aIsTopOfPage ? "top-of-page" : ""); #endif #ifdef DEBUG mSpansAllocated = mSpansFreed = mFramesAllocated = mFramesFreed = 0; #endif mFirstLetterStyleOK = false; mIsTopOfPage = aIsTopOfPage; mImpactedByFloats = aImpactedByFloats; mTotalPlacedFrames = 0; mLineIsEmpty = true; mLineAtStart = true; mLineEndsInBR = false; mSpanDepth = 0; mMaxStartBoxBSize = mMaxEndBoxBSize = 0; if (mGotLineBox) { mLineBox->ClearHasBullet(); } PerSpanData* psd = NewPerSpanData(); mCurrentSpan = mRootSpan = psd; psd->mReflowState = mBlockReflowState; psd->mIStart = aICoord; psd->mICoord = aICoord; psd->mIEnd = aICoord + aISize; mContainerWidth = aContainerWidth; // If we're in a constrained height frame, then we don't allow a // max line box width to take effect. if (!(LineContainerFrame()->GetStateBits() & NS_FRAME_IN_CONSTRAINED_HEIGHT)) { // If the available size is greater than the maximum line box width (if // specified), then we need to adjust the line box width to be at the max // possible width. nscoord maxLineBoxWidth = LineContainerFrame()->PresContext()->PresShell()->MaxLineBoxWidth(); if (maxLineBoxWidth > 0 && psd->mIEnd - psd->mIStart > maxLineBoxWidth) { psd->mIEnd = psd->mIStart + maxLineBoxWidth; } } mBStartEdge = aBCoord; psd->mNoWrap = !mStyleText->WhiteSpaceCanWrapStyle() || LineContainerFrame()->IsSVGText(); psd->mWritingMode = aWritingMode; // If this is the first line of a block then see if the text-indent // property amounts to anything. if (0 == mLineNumber && !HasPrevInFlow(mBlockReflowState->frame)) { const nsStyleCoord &textIndent = mStyleText->mTextIndent; nscoord pctBasis = 0; if (textIndent.HasPercent()) { pctBasis = nsHTMLReflowState::GetContainingBlockContentWidth(mBlockReflowState); if (mGotLineBox) { mLineBox->DisableResizeReflowOptimization(); } } nscoord indent = nsRuleNode::ComputeCoordPercentCalc(textIndent, pctBasis); mTextIndent = indent; psd->mICoord += indent; } } void nsLineLayout::EndLineReflow() { #ifdef NOISY_REFLOW nsFrame::ListTag(stdout, mBlockReflowState->frame); printf(": EndLineReflow: width=%d\n", mRootSpan->mICoord - mRootSpan->mIStart); #endif FreeSpan(mRootSpan); mCurrentSpan = mRootSpan = nullptr; NS_ASSERTION(mSpansAllocated == mSpansFreed, "leak"); NS_ASSERTION(mFramesAllocated == mFramesFreed, "leak"); #if 0 static int32_t maxSpansAllocated = NS_LINELAYOUT_NUM_SPANS; static int32_t maxFramesAllocated = NS_LINELAYOUT_NUM_FRAMES; if (mSpansAllocated > maxSpansAllocated) { printf("XXX: saw a line with %d spans\n", mSpansAllocated); maxSpansAllocated = mSpansAllocated; } if (mFramesAllocated > maxFramesAllocated) { printf("XXX: saw a line with %d frames\n", mFramesAllocated); maxFramesAllocated = mFramesAllocated; } #endif } // XXX swtich to a single mAvailLineWidth that we adjust as each frame // on the line is placed. Each span can still have a per-span mICoord that // tracks where a child frame is going in its span; they don't need a // per-span mIStart? void nsLineLayout::UpdateBand(const nsRect& aNewAvailSpace, nsIFrame* aFloatFrame) { WritingMode lineWM = mRootSpan->mWritingMode; LogicalRect availSpace(lineWM, aNewAvailSpace, mContainerWidth); #ifdef REALLY_NOISY_REFLOW printf("nsLL::UpdateBand %d, %d, %d, %d, (logical %d, %d, %d, %d); frame=%p\n will set mImpacted to true\n", aNewAvailSpace.x, aNewAvailSpace.y, aNewAvailSpace.width, aNewAvailSpace.height, availSpace.IStart(lineWM), availSpace.BStart(lineWM), availSpace.ISize(lineWM), availSpace.BSize(lineWM), aFloatFrame); #endif #ifdef DEBUG if ((availSpace.ISize(lineWM) != NS_UNCONSTRAINEDSIZE) && CRAZY_SIZE(availSpace.ISize(lineWM))) { nsFrame::ListTag(stdout, mBlockReflowState->frame); printf(": UpdateBand: bad caller: ISize WAS %d(0x%x)\n", availSpace.ISize(lineWM), availSpace.ISize(lineWM)); } if ((availSpace.BSize(lineWM) != NS_UNCONSTRAINEDSIZE) && CRAZY_SIZE(availSpace.BSize(lineWM))) { nsFrame::ListTag(stdout, mBlockReflowState->frame); printf(": UpdateBand: bad caller: BSize WAS %d(0x%x)\n", availSpace.BSize(lineWM), availSpace.BSize(lineWM)); } #endif // Compute the difference between last times width and the new width NS_WARN_IF_FALSE(mRootSpan->mIEnd != NS_UNCONSTRAINEDSIZE && aNewAvailSpace.width != NS_UNCONSTRAINEDSIZE, "have unconstrained width; this should only result from " "very large sizes, not attempts at intrinsic width " "calculation"); // The root span's mIStart moves to aICoord nscoord deltaICoord = availSpace.IStart(lineWM) - mRootSpan->mIStart; // The width of all spans changes by this much (the root span's // mIEnd moves to aICoord + aISize, its new width is aISize) nscoord deltaISize = availSpace.ISize(lineWM) - (mRootSpan->mIEnd - mRootSpan->mIStart); #ifdef NOISY_REFLOW nsFrame::ListTag(stdout, mBlockReflowState->frame); printf(": UpdateBand: %d,%d,%d,%d deltaISize=%d deltaICoord=%d\n", aNewAvailSpace.x, aNewAvailSpace.y, aNewAvailSpace.width, aNewAvailSpace.height, deltaISize, deltaICoord); #endif // Update the root span position mRootSpan->mIStart += deltaICoord; mRootSpan->mIEnd += deltaICoord; mRootSpan->mICoord += deltaICoord; // Now update the right edges of the open spans to account for any // change in available space width for (PerSpanData* psd = mCurrentSpan; psd; psd = psd->mParent) { psd->mIEnd += deltaISize; psd->mContainsFloat = true; #ifdef NOISY_REFLOW printf(" span %p: oldIEnd=%d newIEnd=%d\n", psd, psd->mIEnd - deltaISize, psd->mIEnd); #endif } NS_ASSERTION(mRootSpan->mContainsFloat && mRootSpan->mIStart == availSpace.IStart(lineWM) && mRootSpan->mIEnd == availSpace.IEnd(lineWM), "root span was updated incorrectly?"); // Update frame bounds // Note: Only adjust the outermost frames (the ones that are direct // children of the block), not the ones in the child spans. The reason // is simple: the frames in the spans have coordinates local to their // parent therefore they are moved when their parent span is moved. if (deltaICoord != 0) { for (PerFrameData* pfd = mRootSpan->mFirstFrame; pfd; pfd = pfd->mNext) { pfd->mBounds.IStart(lineWM) += deltaICoord; } } mBStartEdge = availSpace.BStart(lineWM); mImpactedByFloats = true; mLastFloatWasLetterFrame = nsGkAtoms::letterFrame == aFloatFrame->GetType(); } nsLineLayout::PerSpanData* nsLineLayout::NewPerSpanData() { PerSpanData* psd = mSpanFreeList; if (!psd) { void *mem; PL_ARENA_ALLOCATE(mem, &mArena, sizeof(PerSpanData)); if (!mem) { NS_RUNTIMEABORT("OOM"); } psd = reinterpret_cast(mem); } else { mSpanFreeList = psd->mNextFreeSpan; } psd->mParent = nullptr; psd->mFrame = nullptr; psd->mFirstFrame = nullptr; psd->mLastFrame = nullptr; psd->mContainsFloat = false; psd->mZeroEffectiveSpanBox = false; psd->mHasNonemptyContent = false; #ifdef DEBUG mSpansAllocated++; #endif return psd; } void nsLineLayout::BeginSpan(nsIFrame* aFrame, const nsHTMLReflowState* aSpanReflowState, nscoord aIStart, nscoord aIEnd, nscoord* aBaseline) { NS_ASSERTION(aIEnd != NS_UNCONSTRAINEDSIZE, "should no longer be using unconstrained sizes"); #ifdef NOISY_REFLOW nsFrame::IndentBy(stdout, mSpanDepth+1); nsFrame::ListTag(stdout, aFrame); printf(": BeginSpan leftEdge=%d rightEdge=%d\n", aIStart, aIEnd); #endif PerSpanData* psd = NewPerSpanData(); // Link up span frame's pfd to point to its child span data PerFrameData* pfd = mCurrentSpan->mLastFrame; NS_ASSERTION(pfd->mFrame == aFrame, "huh?"); pfd->mSpan = psd; // Init new span psd->mFrame = pfd; psd->mParent = mCurrentSpan; psd->mReflowState = aSpanReflowState; psd->mIStart = aIStart; psd->mICoord = aIStart; psd->mIEnd = aIEnd; psd->mBaseline = aBaseline; nsIFrame* frame = aSpanReflowState->frame; psd->mNoWrap = !frame->StyleText()->WhiteSpaceCanWrap(frame); psd->mWritingMode = aSpanReflowState->GetWritingMode(); // Switch to new span mCurrentSpan = psd; mSpanDepth++; } nscoord nsLineLayout::EndSpan(nsIFrame* aFrame) { NS_ASSERTION(mSpanDepth > 0, "end-span without begin-span"); #ifdef NOISY_REFLOW nsFrame::IndentBy(stdout, mSpanDepth); nsFrame::ListTag(stdout, aFrame); printf(": EndSpan width=%d\n", mCurrentSpan->mICoord - mCurrentSpan->mIStart); #endif PerSpanData* psd = mCurrentSpan; nscoord iSizeResult = psd->mLastFrame ? (psd->mICoord - psd->mIStart) : 0; mSpanDepth--; mCurrentSpan->mReflowState = nullptr; // no longer valid so null it out! mCurrentSpan = mCurrentSpan->mParent; return iSizeResult; } int32_t nsLineLayout::GetCurrentSpanCount() const { NS_ASSERTION(mCurrentSpan == mRootSpan, "bad linelayout user"); int32_t count = 0; PerFrameData* pfd = mRootSpan->mFirstFrame; while (nullptr != pfd) { count++; pfd = pfd->mNext; } return count; } void nsLineLayout::SplitLineTo(int32_t aNewCount) { NS_ASSERTION(mCurrentSpan == mRootSpan, "bad linelayout user"); #ifdef REALLY_NOISY_PUSHING printf("SplitLineTo %d (current count=%d); before:\n", aNewCount, GetCurrentSpanCount()); DumpPerSpanData(mRootSpan, 1); #endif PerSpanData* psd = mRootSpan; PerFrameData* pfd = psd->mFirstFrame; while (nullptr != pfd) { if (--aNewCount == 0) { // Truncate list at pfd (we keep pfd, but anything following is freed) PerFrameData* next = pfd->mNext; pfd->mNext = nullptr; psd->mLastFrame = pfd; // Now release all of the frames following pfd pfd = next; while (nullptr != pfd) { next = pfd->mNext; pfd->mNext = mFrameFreeList; mFrameFreeList = pfd; #ifdef DEBUG mFramesFreed++; #endif if (nullptr != pfd->mSpan) { FreeSpan(pfd->mSpan); } pfd = next; } break; } pfd = pfd->mNext; } #ifdef NOISY_PUSHING printf("SplitLineTo %d (current count=%d); after:\n", aNewCount, GetCurrentSpanCount()); DumpPerSpanData(mRootSpan, 1); #endif } void nsLineLayout::PushFrame(nsIFrame* aFrame) { PerSpanData* psd = mCurrentSpan; NS_ASSERTION(psd->mLastFrame->mFrame == aFrame, "pushing non-last frame"); #ifdef REALLY_NOISY_PUSHING nsFrame::IndentBy(stdout, mSpanDepth); printf("PushFrame %p, before:\n", psd); DumpPerSpanData(psd, 1); #endif // Take the last frame off of the span's frame list PerFrameData* pfd = psd->mLastFrame; if (pfd == psd->mFirstFrame) { // We are pushing away the only frame...empty the list psd->mFirstFrame = nullptr; psd->mLastFrame = nullptr; } else { PerFrameData* prevFrame = pfd->mPrev; prevFrame->mNext = nullptr; psd->mLastFrame = prevFrame; } // Now free it, and if it has a span, free that too pfd->mNext = mFrameFreeList; mFrameFreeList = pfd; #ifdef DEBUG mFramesFreed++; #endif if (nullptr != pfd->mSpan) { FreeSpan(pfd->mSpan); } #ifdef NOISY_PUSHING nsFrame::IndentBy(stdout, mSpanDepth); printf("PushFrame: %p after:\n", psd); DumpPerSpanData(psd, 1); #endif } void nsLineLayout::FreeSpan(PerSpanData* psd) { // Free its frames PerFrameData* pfd = psd->mFirstFrame; while (nullptr != pfd) { if (nullptr != pfd->mSpan) { FreeSpan(pfd->mSpan); } PerFrameData* next = pfd->mNext; pfd->mNext = mFrameFreeList; mFrameFreeList = pfd; #ifdef DEBUG mFramesFreed++; #endif pfd = next; } // Now put the span on the free list since it's free too psd->mNextFreeSpan = mSpanFreeList; mSpanFreeList = psd; #ifdef DEBUG mSpansFreed++; #endif } bool nsLineLayout::IsZeroBSize() { PerSpanData* psd = mCurrentSpan; PerFrameData* pfd = psd->mFirstFrame; while (nullptr != pfd) { if (0 != pfd->mBounds.BSize(psd->mWritingMode)) { return false; } pfd = pfd->mNext; } return true; } nsLineLayout::PerFrameData* nsLineLayout::NewPerFrameData(nsIFrame* aFrame) { PerFrameData* pfd = mFrameFreeList; if (!pfd) { void *mem; PL_ARENA_ALLOCATE(mem, &mArena, sizeof(PerFrameData)); if (!mem) { NS_RUNTIMEABORT("OOM"); } pfd = reinterpret_cast(mem); } else { mFrameFreeList = pfd->mNext; } pfd->mSpan = nullptr; pfd->mNext = nullptr; pfd->mPrev = nullptr; pfd->mFlags = 0; // all flags default to false pfd->mFrame = aFrame; WritingMode frameWM = aFrame->GetWritingMode(); WritingMode lineWM = mRootSpan->mWritingMode; pfd->mBounds = LogicalRect(lineWM); pfd->mMargin = LogicalMargin(frameWM); pfd->mBorderPadding = LogicalMargin(frameWM); pfd->mOffsets = LogicalMargin(frameWM); #ifdef DEBUG pfd->mBlockDirAlign = 0xFF; mFramesAllocated++; #endif return pfd; } bool nsLineLayout::LineIsBreakable() const { // XXX mTotalPlacedFrames should go away and we should just use // mLineIsEmpty here instead if ((0 != mTotalPlacedFrames) || mImpactedByFloats) { return true; } return false; } // Checks all four sides for percentage units. This means it should // only be used for things (margin, padding) where percentages on top // and bottom depend on the *width* just like percentages on left and // right. static bool HasPercentageUnitSide(const nsStyleSides& aSides) { NS_FOR_CSS_SIDES(side) { if (aSides.Get(side).HasPercent()) return true; } return false; } static bool IsPercentageAware(const nsIFrame* aFrame) { NS_ASSERTION(aFrame, "null frame is not allowed"); nsIAtom *fType = aFrame->GetType(); if (fType == nsGkAtoms::textFrame) { // None of these things can ever be true for text frames. return false; } // Some of these things don't apply to non-replaced inline frames // (that is, fType == nsGkAtoms::inlineFrame), but we won't bother making // things unnecessarily complicated, since they'll probably be set // quite rarely. const nsStyleMargin* margin = aFrame->StyleMargin(); if (HasPercentageUnitSide(margin->mMargin)) { return true; } const nsStylePadding* padding = aFrame->StylePadding(); if (HasPercentageUnitSide(padding->mPadding)) { return true; } // Note that borders can't be aware of percentages const nsStylePosition* pos = aFrame->StylePosition(); if ((pos->WidthDependsOnContainer() && pos->mWidth.GetUnit() != eStyleUnit_Auto) || pos->MaxWidthDependsOnContainer() || pos->MinWidthDependsOnContainer() || pos->OffsetHasPercent(NS_SIDE_RIGHT) || pos->OffsetHasPercent(NS_SIDE_LEFT)) { return true; } if (eStyleUnit_Auto == pos->mWidth.GetUnit()) { // We need to check for frames that shrink-wrap when they're auto // width. const nsStyleDisplay* disp = aFrame->StyleDisplay(); if (disp->mDisplay == NS_STYLE_DISPLAY_INLINE_BLOCK || disp->mDisplay == NS_STYLE_DISPLAY_INLINE_TABLE || fType == nsGkAtoms::HTMLButtonControlFrame || fType == nsGkAtoms::gfxButtonControlFrame || fType == nsGkAtoms::fieldSetFrame || fType == nsGkAtoms::comboboxDisplayFrame) { return true; } // Per CSS 2.1, section 10.3.2: // If 'height' and 'width' both have computed values of 'auto' and // the element has an intrinsic ratio but no intrinsic height or // width and the containing block's width does not itself depend // on the replaced element's width, then the used value of 'width' // is calculated from the constraint equation used for // block-level, non-replaced elements in normal flow. nsIFrame *f = const_cast(aFrame); if (f->GetIntrinsicRatio() != nsSize(0, 0) && // Some percents are treated like 'auto', so check != coord pos->mHeight.GetUnit() != eStyleUnit_Coord) { const IntrinsicSize &intrinsicSize = f->GetIntrinsicSize(); if (intrinsicSize.width.GetUnit() == eStyleUnit_None && intrinsicSize.height.GetUnit() == eStyleUnit_None) { return true; } } } return false; } void nsLineLayout::ReflowFrame(nsIFrame* aFrame, nsReflowStatus& aReflowStatus, nsHTMLReflowMetrics* aMetrics, bool& aPushedFrame) { // Initialize OUT parameter aPushedFrame = false; PerFrameData* pfd = NewPerFrameData(aFrame); PerSpanData* psd = mCurrentSpan; psd->AppendFrame(pfd); #ifdef REALLY_NOISY_REFLOW nsFrame::IndentBy(stdout, mSpanDepth); printf("%p: Begin ReflowFrame pfd=%p ", psd, pfd); nsFrame::ListTag(stdout, aFrame); printf("\n"); #endif if (mCurrentSpan == mRootSpan) { pfd->mFrame->Properties().Remove(nsIFrame::LineBaselineOffset()); } else { #ifdef DEBUG bool hasLineOffset; pfd->mFrame->Properties().Get(nsIFrame::LineBaselineOffset(), &hasLineOffset); NS_ASSERTION(!hasLineOffset, "LineBaselineOffset was set but was not expected"); #endif } mTextJustificationNumSpaces = 0; mTextJustificationNumLetters = 0; // Stash copies of some of the computed state away for later // (block-direction alignment, for example) WritingMode frameWM = aFrame->GetWritingMode(); WritingMode lineWM = mRootSpan->mWritingMode; // NOTE: While the inline direction coordinate remains relative to the // parent span, the block direction coordinate is fixed at the top // edge for the line. During VerticalAlignFrames we will repair this // so that the block direction coordinate is properly set and relative // to the appropriate span. pfd->mBounds.IStart(lineWM) = psd->mICoord; pfd->mBounds.BStart(lineWM) = mBStartEdge; // We want to guarantee that we always make progress when // formatting. Therefore, if the object being placed on the line is // too big for the line, but it is the only thing on the line and is not // impacted by a float, then we go ahead and place it anyway. (If the line // is impacted by one or more floats, then it is safe to break because // we can move the line down below float(s).) // // Capture this state *before* we reflow the frame in case it clears // the state out. We need to know how to treat the current frame // when breaking. bool notSafeToBreak = LineIsEmpty() && !mImpactedByFloats; // Figure out whether we're talking about a textframe here nsIAtom* frameType = aFrame->GetType(); bool isText = frameType == nsGkAtoms::textFrame; // Compute the available size for the frame. This available width // includes room for the side margins. // For now, set the available height to unconstrained always. nsSize availSize(mBlockReflowState->ComputedWidth(), NS_UNCONSTRAINEDSIZE); // Inline-ish and text-ish things don't compute their width; // everything else does. We need to give them an available width that // reflects the space left on the line. NS_WARN_IF_FALSE(psd->mIEnd != NS_UNCONSTRAINEDSIZE, "have unconstrained width; this should only result from " "very large sizes, not attempts at intrinsic width " "calculation"); nscoord availableSpaceOnLine = psd->mIEnd - psd->mICoord; // Setup reflow state for reflowing the frame Maybe reflowStateHolder; if (!isText) { reflowStateHolder.construct(mPresContext, *psd->mReflowState, aFrame, availSize); nsHTMLReflowState& reflowState = reflowStateHolder.ref(); reflowState.mLineLayout = this; reflowState.mFlags.mIsTopOfPage = mIsTopOfPage; if (reflowState.ComputedWidth() == NS_UNCONSTRAINEDSIZE) reflowState.AvailableWidth() = availableSpaceOnLine; WritingMode stateWM = reflowState.GetWritingMode(); pfd->mMargin = reflowState.ComputedLogicalMargin().ConvertTo(frameWM, stateWM); pfd->mBorderPadding = reflowState.ComputedLogicalBorderPadding().ConvertTo(frameWM, stateWM); pfd->SetFlag(PFD_RELATIVEPOS, reflowState.mStyleDisplay->IsRelativelyPositionedStyle()); if (pfd->GetFlag(PFD_RELATIVEPOS)) { pfd->mOffsets = reflowState.ComputedLogicalOffsets().ConvertTo(frameWM, stateWM); } // Calculate whether the the frame should have a start margin and // subtract the margin from the available width if necessary. // The margin will be applied to the starting inline coordinates of // the frame in CanPlaceFrame() after reflowing the frame. AllowForStartMargin(pfd, reflowState); } // if isText(), no need to propagate NS_FRAME_IS_DIRTY from the parent, // because reflow doesn't look at the dirty bits on the frame being reflowed. // See if this frame depends on the width of its containing block. If // so, disable resize reflow optimizations for the line. (Note that, // to be conservative, we do this if we *try* to fit a frame on a // line, even if we don't succeed.) (Note also that we can only make // this IsPercentageAware check *after* we've constructed our // nsHTMLReflowState, because that construction may be what forces aFrame // to lazily initialize its (possibly-percent-valued) intrinsic size.) if (mGotLineBox && IsPercentageAware(aFrame)) { mLineBox->DisableResizeReflowOptimization(); } // Let frame know that are reflowing it. Note that we don't bother // positioning the frame yet, because we're probably going to end up // moving it when we do the block-direction alignment aFrame->WillReflow(mPresContext); // Adjust spacemanager coordinate system for the frame. nsHTMLReflowMetrics metrics(lineWM); #ifdef DEBUG metrics.Width() = nscoord(0xdeadbeef); metrics.Height() = nscoord(0xdeadbeef); #endif nsRect physicalBounds = pfd->mBounds.GetPhysicalRect(lineWM, mContainerWidth); nscoord tx = physicalBounds.x; nscoord ty = physicalBounds.y; mFloatManager->Translate(tx, ty); int32_t savedOptionalBreakOffset; gfxBreakPriority savedOptionalBreakPriority; nsIContent* savedOptionalBreakContent = GetLastOptionalBreakPosition(&savedOptionalBreakOffset, &savedOptionalBreakPriority); if (!isText) { aFrame->Reflow(mPresContext, metrics, reflowStateHolder.ref(), aReflowStatus); } else { static_cast(aFrame)-> ReflowText(*this, availableSpaceOnLine, psd->mReflowState->rendContext, metrics, aReflowStatus); } pfd->mJustificationNumSpaces = mTextJustificationNumSpaces; pfd->mJustificationNumLetters = mTextJustificationNumLetters; // See if the frame is a placeholderFrame and if it is process // the float. At the same time, check if the frame has any non-collapsed-away // content. bool placedFloat = false; bool isEmpty; if (!frameType) { isEmpty = pfd->mFrame->IsEmpty(); } else { if (nsGkAtoms::placeholderFrame == frameType) { isEmpty = true; pfd->SetFlag(PFD_SKIPWHENTRIMMINGWHITESPACE, true); nsIFrame* outOfFlowFrame = nsLayoutUtils::GetFloatFromPlaceholder(aFrame); if (outOfFlowFrame) { // Add mTrimmableWidth to the available width since if the line ends // here, the width of the inline content will be reduced by // mTrimmableWidth. nscoord availableWidth = psd->mIEnd - (psd->mICoord - mTrimmableWidth); if (psd->mNoWrap) { // If we place floats after inline content where there's // no break opportunity, we don't know how much additional // width is required for the non-breaking content after the float, // so we can't know whether the float plus that content will fit // on the line. So for now, don't place floats after inline // content where there's no break opportunity. This is incorrect // but hopefully rare. Fixing it will require significant // restructuring of line layout. // We might as well allow zero-width floats to be placed, though. availableWidth = 0; } placedFloat = AddFloat(outOfFlowFrame, availableWidth); NS_ASSERTION(!(outOfFlowFrame->GetType() == nsGkAtoms::letterFrame && GetFirstLetterStyleOK()), "FirstLetterStyle set on line with floating first letter"); } } else if (isText) { // Note non-empty text-frames for inline frame compatibility hackery pfd->SetFlag(PFD_ISTEXTFRAME, true); nsTextFrame* textFrame = static_cast(pfd->mFrame); isEmpty = !textFrame->HasNoncollapsedCharacters(); if (!isEmpty) { pfd->SetFlag(PFD_ISNONEMPTYTEXTFRAME, true); nsIContent* content = textFrame->GetContent(); const nsTextFragment* frag = content->GetText(); if (frag) { pfd->SetFlag(PFD_ISNONWHITESPACETEXTFRAME, !content->TextIsOnlyWhitespace()); } } } else if (nsGkAtoms::brFrame == frameType) { pfd->SetFlag(PFD_SKIPWHENTRIMMINGWHITESPACE, true); isEmpty = false; } else { if (nsGkAtoms::letterFrame==frameType) { pfd->SetFlag(PFD_ISLETTERFRAME, true); } if (pfd->mSpan) { isEmpty = !pfd->mSpan->mHasNonemptyContent && pfd->mFrame->IsSelfEmpty(); } else { isEmpty = pfd->mFrame->IsEmpty(); } } } mFloatManager->Translate(-tx, -ty); NS_ASSERTION(metrics.Width() >= 0, "bad width"); NS_ASSERTION(metrics.Height() >= 0,"bad height"); if (metrics.Width() < 0) metrics.Width() = 0; if (metrics.Height() < 0) metrics.Height() = 0; #ifdef DEBUG // Note: break-before means ignore the reflow metrics since the // frame will be reflowed another time. if (!NS_INLINE_IS_BREAK_BEFORE(aReflowStatus)) { if (CRAZY_SIZE(metrics.Width()) || CRAZY_SIZE(metrics.Height())) { printf("nsLineLayout: "); nsFrame::ListTag(stdout, aFrame); printf(" metrics=%d,%d!\n", metrics.Width(), metrics.Height()); } if ((metrics.Width() == nscoord(0xdeadbeef)) || (metrics.Height() == nscoord(0xdeadbeef))) { printf("nsLineLayout: "); nsFrame::ListTag(stdout, aFrame); printf(" didn't set w/h %d,%d!\n", metrics.Width(), metrics.Height()); } } #endif // Unlike with non-inline reflow, the overflow area here does *not* // include the accumulation of the frame's bounds and its inline // descendants' bounds. Nor does it include the outline area; it's // just the union of the bounds of any absolute children. That is // added in later by nsLineLayout::ReflowInlineFrames. pfd->mOverflowAreas = metrics.mOverflowAreas; pfd->mBounds.ISize(lineWM) = metrics.ISize(lineWM); pfd->mBounds.BSize(lineWM) = metrics.BSize(lineWM); // Size the frame, but |RelativePositionFrames| will size the view. aFrame->SetSize(nsSize(metrics.Width(), metrics.Height())); // Tell the frame that we're done reflowing it aFrame->DidReflow(mPresContext, isText ? nullptr : reflowStateHolder.addr(), nsDidReflowStatus::FINISHED); if (aMetrics) { *aMetrics = metrics; } if (!NS_INLINE_IS_BREAK_BEFORE(aReflowStatus)) { // If frame is complete and has a next-in-flow, we need to delete // them now. Do not do this when a break-before is signaled because // the frame is going to get reflowed again (and may end up wanting // a next-in-flow where it ends up). if (NS_FRAME_IS_COMPLETE(aReflowStatus)) { nsIFrame* kidNextInFlow = aFrame->GetNextInFlow(); if (nullptr != kidNextInFlow) { // Remove all of the childs next-in-flows. Make sure that we ask // the right parent to do the removal (it's possible that the // parent is not this because we are executing pullup code) kidNextInFlow->GetParent()-> DeleteNextInFlowChild(kidNextInFlow, true); } } // Check whether this frame breaks up text runs. All frames break up text // runs (hence return false here) except for text frames and inline containers. bool continuingTextRun = aFrame->CanContinueTextRun(); // Clear any residual mTrimmableWidth if this isn't a text frame if (!continuingTextRun && !pfd->GetFlag(PFD_SKIPWHENTRIMMINGWHITESPACE)) { mTrimmableWidth = 0; } // See if we can place the frame. If we can't fit it, then we // return now. bool optionalBreakAfterFits; NS_ASSERTION(isText || !reflowStateHolder.ref().IsFloating(), "How'd we get a floated inline frame? " "The frame ctor should've dealt with this."); if (CanPlaceFrame(pfd, notSafeToBreak, continuingTextRun, savedOptionalBreakContent != nullptr, metrics, aReflowStatus, &optionalBreakAfterFits)) { if (!isEmpty) { psd->mHasNonemptyContent = true; mLineIsEmpty = false; if (!pfd->mSpan) { // nonempty leaf content has been placed mLineAtStart = false; } } // Place the frame, updating aBounds with the final size and // location. Then apply the bottom+right margins (as // appropriate) to the frame. PlaceFrame(pfd, metrics); PerSpanData* span = pfd->mSpan; if (span) { // The frame we just finished reflowing is an inline // container. It needs its child frames aligned in the block direction, // so do most of it now. VerticalAlignFrames(span); } if (!continuingTextRun) { if (!psd->mNoWrap && (!LineIsEmpty() || placedFloat)) { // record soft break opportunity after this content that can't be // part of a text run. This is not a text frame so we know // that offset INT32_MAX means "after the content". if (NotifyOptionalBreakPosition(aFrame->GetContent(), INT32_MAX, optionalBreakAfterFits, gfxBreakPriority::eNormalBreak)) { // If this returns true then we are being told to actually break here. aReflowStatus = NS_INLINE_LINE_BREAK_AFTER(aReflowStatus); } } } } else { PushFrame(aFrame); aPushedFrame = true; // Undo any saved break positions that the frame might have told us about, // since we didn't end up placing it RestoreSavedBreakPosition(savedOptionalBreakContent, savedOptionalBreakOffset, savedOptionalBreakPriority); } } else { PushFrame(aFrame); } #ifdef REALLY_NOISY_REFLOW nsFrame::IndentBy(stdout, mSpanDepth); printf("End ReflowFrame "); nsFrame::ListTag(stdout, aFrame); printf(" status=%x\n", aReflowStatus); #endif } void nsLineLayout::AllowForStartMargin(PerFrameData* pfd, nsHTMLReflowState& aReflowState) { NS_ASSERTION(!aReflowState.IsFloating(), "How'd we get a floated inline frame? " "The frame ctor should've dealt with this."); WritingMode frameWM = pfd->mFrame->GetWritingMode(); // Only apply start-margin on the first-in flow for inline frames, // and make sure to not apply it to any inline other than the first // in an ib split. Note that the ib sibling (block-in-inline // sibling) annotations only live on the first continuation, but we // don't want to apply the start margin for later continuations // anyway. For box-decoration-break:clone we apply the start-margin // on all continuations. if ((pfd->mFrame->GetPrevContinuation() || pfd->mFrame->FrameIsNonFirstInIBSplit()) && aReflowState.mStyleBorder->mBoxDecorationBreak == NS_STYLE_BOX_DECORATION_BREAK_SLICE) { // Zero this out so that when we compute the max-element-width of // the frame we will properly avoid adding in the starting margin. pfd->mMargin.IStart(frameWM) = 0; } else { NS_WARN_IF_FALSE(NS_UNCONSTRAINEDSIZE != aReflowState.AvailableWidth(), "have unconstrained width; this should only result from " "very large sizes, not attempts at intrinsic width " "calculation"); if (NS_UNCONSTRAINEDSIZE == aReflowState.ComputedWidth()) { // For inline-ish and text-ish things (which don't compute widths // in the reflow state), adjust available width to account for the // start margin. The end margin will be accounted for when we // finish flowing the frame. aReflowState.AvailableWidth() -= pfd->mMargin.IStart(frameWM); } } } nscoord nsLineLayout::GetCurrentFrameInlineDistanceFromBlock() { PerSpanData* psd; nscoord x = 0; for (psd = mCurrentSpan; psd; psd = psd->mParent) { x += psd->mICoord; } return x; } /** * See if the frame can be placed now that we know it's desired size. * We can always place the frame if the line is empty. Note that we * know that the reflow-status is not a break-before because if it was * ReflowFrame above would have returned false, preventing this method * from being called. The logic in this method assumes that. * * Note that there is no check against the Y coordinate because we * assume that the caller will take care of that. */ bool nsLineLayout::CanPlaceFrame(PerFrameData* pfd, bool aNotSafeToBreak, bool aFrameCanContinueTextRun, bool aCanRollBackBeforeFrame, nsHTMLReflowMetrics& aMetrics, nsReflowStatus& aStatus, bool* aOptionalBreakAfterFits) { NS_PRECONDITION(pfd && pfd->mFrame, "bad args, null pointers for frame data"); *aOptionalBreakAfterFits = true; WritingMode frameWM = pfd->mFrame->GetWritingMode(); WritingMode lineWM = mRootSpan->mWritingMode; /* * We want to only apply the end margin if we're the last continuation and * either not in an {ib} split or the last inline in it. In all other * cases we want to zero it out. That means zeroing it out if any of these * conditions hold: * 1) The frame is not complete (in this case it will get a next-in-flow) * 2) The frame is complete but has a non-fluid continuation on its * continuation chain. Note that if it has a fluid continuation, that * continuation will get destroyed later, so we don't want to drop the * end-margin in that case. * 3) The frame is in an {ib} split and is not the last part. * * However, none of that applies if this is a letter frame (XXXbz why?) * * For box-decoration-break:clone we apply the end margin on all * continuations (that are not letter frames). */ if ((NS_FRAME_IS_NOT_COMPLETE(aStatus) || pfd->mFrame->LastInFlow()->GetNextContinuation() || pfd->mFrame->FrameIsNonLastInIBSplit()) && !pfd->GetFlag(PFD_ISLETTERFRAME) && pfd->mFrame->StyleBorder()->mBoxDecorationBreak == NS_STYLE_BOX_DECORATION_BREAK_SLICE) { pfd->mMargin.IEnd(frameWM) = 0; } // Convert the frame's margins to the line's writing mode and apply // the start margin to the frame bounds. LogicalMargin usedMargins = pfd->mMargin.ConvertTo(lineWM, frameWM); nscoord startMargin = usedMargins.IStart(lineWM); nscoord endMargin = usedMargins.IEnd(lineWM); pfd->mBounds.IStart(lineWM) += startMargin; PerSpanData* psd = mCurrentSpan; if (psd->mNoWrap) { // When wrapping is off, everything fits. return true; } #ifdef NOISY_CAN_PLACE_FRAME if (nullptr != psd->mFrame) { nsFrame::ListTag(stdout, psd->mFrame->mFrame); } else { nsFrame::ListTag(stdout, mBlockReflowState->frame); } printf(": aNotSafeToBreak=%s frame=", aNotSafeToBreak ? "true" : "false"); nsFrame::ListTag(stdout, pfd->mFrame); printf(" frameWidth=%d, margins=%d,%d\n", pfd->mBounds.IEnd(lineWM) + endMargin - psd->mICoord, startMargin, endMargin); #endif // Set outside to true if the result of the reflow leads to the // frame sticking outside of our available area. bool outside = pfd->mBounds.IEnd(lineWM) - mTrimmableWidth + endMargin > psd->mIEnd; if (!outside) { // If it fits, it fits #ifdef NOISY_CAN_PLACE_FRAME printf(" ==> inside\n"); #endif return true; } *aOptionalBreakAfterFits = false; // When it doesn't fit, check for a few special conditions where we // allow it to fit anyway. if (0 == startMargin + pfd->mBounds.ISize(lineWM) + endMargin) { // Empty frames always fit right where they are #ifdef NOISY_CAN_PLACE_FRAME printf(" ==> empty frame fits\n"); #endif return true; } #ifdef FIX_BUG_50257 // another special case: always place a BR if (nsGkAtoms::brFrame == pfd->mFrame->GetType()) { #ifdef NOISY_CAN_PLACE_FRAME printf(" ==> BR frame fits\n"); #endif return true; } #endif if (aNotSafeToBreak) { // There are no frames on the line that take up width and the line is // not impacted by floats, so we must allow the current frame to be // placed on the line #ifdef NOISY_CAN_PLACE_FRAME printf(" ==> not-safe and not-impacted fits: "); while (nullptr != psd) { printf(" ", psd, psd->mICoord, psd->mIStart); psd = psd->mParent; } printf("\n"); #endif return true; } // Special check for span frames if (pfd->mSpan && pfd->mSpan->mContainsFloat) { // If the span either directly or indirectly contains a float then // it fits. Why? It's kind of complicated, but here goes: // // 1. CanPlaceFrame is used for all frame placements on a line, // and in a span. This includes recursively placement of frames // inside of spans, and the span itself. Because the logic always // checks for room before proceeding (the code above here), the // only things on a line will be those things that "fit". // // 2. Before a float is placed on a line, the line has to be empty // (otherwise it's a "below current line" float and will be placed // after the line). // // Therefore, if the span directly or indirectly has a float // then it means that at the time of the placement of the float // the line was empty. Because of #1, only the frames that fit can // be added after that point, therefore we can assume that the // current span being placed has fit. // // So how do we get here and have a span that should already fit // and yet doesn't: Simple: span's that have the no-wrap attribute // set on them and contain a float and are placed where they // don't naturally fit. return true; } if (aFrameCanContinueTextRun) { // Let it fit, but we reserve the right to roll back. // Note that we usually won't get here because a text frame will break // itself to avoid exceeding the available width. // We'll only get here for text frames that couldn't break early enough. #ifdef NOISY_CAN_PLACE_FRAME printf(" ==> placing overflowing textrun, requesting backup\n"); #endif // We will want to try backup. mNeedBackup = true; return true; } #ifdef NOISY_CAN_PLACE_FRAME printf(" ==> didn't fit\n"); #endif aStatus = NS_INLINE_LINE_BREAK_BEFORE(); return false; } /** * Place the frame. Update running counters. */ void nsLineLayout::PlaceFrame(PerFrameData* pfd, nsHTMLReflowMetrics& aMetrics) { WritingMode frameWM = pfd->mFrame->GetWritingMode(); WritingMode lineWM = mRootSpan->mWritingMode; // Record ascent and update max-ascent and max-descent values if (aMetrics.BlockStartAscent() == nsHTMLReflowMetrics::ASK_FOR_BASELINE) { pfd->mAscent = pfd->mFrame->GetLogicalBaseline(lineWM); } else { pfd->mAscent = aMetrics.BlockStartAscent(); } // Advance to next inline coordinate mCurrentSpan->mICoord = pfd->mBounds.IEnd(lineWM) + pfd->mMargin.ConvertTo(lineWM, frameWM).IEnd(lineWM); // Count the number of non-placeholder frames on the line... if (pfd->mFrame->GetType() == nsGkAtoms::placeholderFrame) { NS_ASSERTION(pfd->mBounds.ISize(lineWM) == 0 && pfd->mBounds.BSize(lineWM) == 0, "placeholders should have 0 width/height (checking " "placeholders were never counted by the old code in " "this function)"); } else { mTotalPlacedFrames++; } } void nsLineLayout::AddBulletFrame(nsIFrame* aFrame, const nsHTMLReflowMetrics& aMetrics) { NS_ASSERTION(mCurrentSpan == mRootSpan, "bad linelayout user"); NS_ASSERTION(mGotLineBox, "must have line box"); nsIFrame *blockFrame = mBlockReflowState->frame; NS_ASSERTION(blockFrame->IsFrameOfType(nsIFrame::eBlockFrame), "must be for block"); if (!static_cast(blockFrame)->BulletIsEmpty()) { mHasBullet = true; mLineBox->SetHasBullet(); } WritingMode lineWM = mRootSpan->mWritingMode; PerFrameData* pfd = NewPerFrameData(aFrame); mRootSpan->AppendFrame(pfd); pfd->SetFlag(PFD_ISBULLET, true); if (aMetrics.BlockStartAscent() == nsHTMLReflowMetrics::ASK_FOR_BASELINE) { pfd->mAscent = aFrame->GetLogicalBaseline(lineWM); } else { pfd->mAscent = aMetrics.BlockStartAscent(); } // Note: block-coord value will be updated during block-direction alignment pfd->mBounds = LogicalRect(lineWM, aFrame->GetRect(), mContainerWidth); pfd->mOverflowAreas = aMetrics.mOverflowAreas; } #ifdef DEBUG void nsLineLayout::DumpPerSpanData(PerSpanData* psd, int32_t aIndent) { nsFrame::IndentBy(stdout, aIndent); printf("%p: left=%d x=%d right=%d\n", static_cast(psd), psd->mIStart, psd->mICoord, psd->mIEnd); PerFrameData* pfd = psd->mFirstFrame; while (nullptr != pfd) { nsFrame::IndentBy(stdout, aIndent+1); nsFrame::ListTag(stdout, pfd->mFrame); nsRect rect = pfd->mBounds.GetPhysicalRect(psd->mWritingMode, mContainerWidth); printf(" %d,%d,%d,%d\n", rect.x, rect.y, rect.width, rect.height); if (pfd->mSpan) { DumpPerSpanData(pfd->mSpan, aIndent + 1); } pfd = pfd->mNext; } } #endif #define VALIGN_OTHER 0 #define VALIGN_TOP 1 #define VALIGN_BOTTOM 2 void nsLineLayout::VerticalAlignLine() { // Synthesize a PerFrameData for the block frame PerFrameData rootPFD(mBlockReflowState->frame->GetWritingMode()); rootPFD.mFrame = mBlockReflowState->frame; rootPFD.mAscent = 0; mRootSpan->mFrame = &rootPFD; // Partially place the children of the block frame. The baseline for // this operation is set to zero so that the y coordinates for all // of the placed children will be relative to there. PerSpanData* psd = mRootSpan; VerticalAlignFrames(psd); // *** Note that comments here still use the anachronistic term // "line-height" when we really mean "size of the line in the block // direction", "vertical-align" when we really mean "alignment in // the block direction", and "top" and "bottom" when we really mean // "block start" and "block end". This is partly for brevity and // partly to retain the association with the CSS line-height and // vertical-align properties. // // Compute the line-height. The line-height will be the larger of: // // [1] maxBCoord - minBCoord (the distance between the first child's // block-start edge and the last child's block-end edge) // // [2] the maximum logical box block size (since not every frame may have // participated in #1; for example: "top" and "botttom" aligned frames) // // [3] the minimum line height ("line-height" property set on the // block frame) nscoord lineBSize = psd->mMaxBCoord - psd->mMinBCoord; // Now that the line-height is computed, we need to know where the // baseline is in the line. Position baseline so that mMinBCoord is just // inside the start of the line box. nscoord baselineBCoord; if (psd->mMinBCoord < 0) { baselineBCoord = mBStartEdge - psd->mMinBCoord; } else { baselineBCoord = mBStartEdge; } // It's also possible that the line block-size isn't tall enough because // of "top" and "bottom" aligned elements that were not accounted for in // min/max BCoord. // // The CSS2 spec doesn't really say what happens when to the // baseline in this situations. What we do is if the largest start // aligned box block size is greater than the line block-size then we leave // the baseline alone. If the largest end aligned box is greater // than the line block-size then we slide the baseline forward by the extra // amount. // // Navigator 4 gives precedence to the first top/bottom aligned // object. We just let block end aligned objects win. if (lineBSize < mMaxEndBoxBSize) { // When the line is shorter than the maximum block start aligned box nscoord extra = mMaxEndBoxBSize - lineBSize; baselineBCoord += extra; lineBSize = mMaxEndBoxBSize; } if (lineBSize < mMaxStartBoxBSize) { lineBSize = mMaxStartBoxBSize; } #ifdef NOISY_BLOCKDIR_ALIGN printf(" [line]==> lineBSize=%d baselineBCoord=%d\n", lineBSize, baselineBCoord); #endif // Now position all of the frames in the root span. We will also // recurse over the child spans and place any frames we find with // vertical-align: top or bottom. // XXX PERFORMANCE: set a bit per-span to avoid the extra work // (propagate it upward too) WritingMode lineWM = psd->mWritingMode; for (PerFrameData* pfd = psd->mFirstFrame; pfd; pfd = pfd->mNext) { if (pfd->mBlockDirAlign == VALIGN_OTHER) { pfd->mBounds.BStart(lineWM) += baselineBCoord; pfd->mFrame->SetRect(lineWM, pfd->mBounds, mContainerWidth); } } PlaceTopBottomFrames(psd, -mBStartEdge, lineBSize); // Fill in returned line-box and max-element-width data mLineBox->SetBounds(lineWM, psd->mIStart, mBStartEdge, psd->mICoord - psd->mIStart, lineBSize, mContainerWidth); mFinalLineBSize = lineBSize; mLineBox->SetLogicalAscent(baselineBCoord - mBStartEdge); #ifdef NOISY_BLOCKDIR_ALIGN printf( " [line]==> bounds{x,y,w,h}={%d,%d,%d,%d} lh=%d a=%d\n", mLineBox->GetBounds().IStart(lineWM), mLineBox->GetBounds().BStart(lineWM), mLineBox->GetBounds().ISize(lineWM), mLineBox->GetBounds().BSize(lineWM), mFinalLineBSize, mLineBox->GetLogicalAscent()); #endif // Undo root-span mFrame pointer to prevent brane damage later on... mRootSpan->mFrame = nullptr; } // Place frames with CSS property vertical-align: top or bottom. void nsLineLayout::PlaceTopBottomFrames(PerSpanData* psd, nscoord aDistanceFromStart, nscoord aLineBSize) { for (PerFrameData* pfd = psd->mFirstFrame; pfd; pfd = pfd->mNext) { PerSpanData* span = pfd->mSpan; #ifdef DEBUG NS_ASSERTION(0xFF != pfd->mBlockDirAlign, "umr"); #endif WritingMode frameWM = pfd->mFrame->GetWritingMode(); WritingMode lineWM = mRootSpan->mWritingMode; switch (pfd->mBlockDirAlign) { case VALIGN_TOP: if (span) { pfd->mBounds.BStart(lineWM) = -aDistanceFromStart - span->mMinBCoord; } else { pfd->mBounds.BStart(lineWM) = -aDistanceFromStart + pfd->mMargin.BStart(frameWM); } pfd->mFrame->SetRect(lineWM, pfd->mBounds, mContainerWidth); #ifdef NOISY_BLOCKDIR_ALIGN printf(" "); nsFrame::ListTag(stdout, pfd->mFrame); printf(": y=%d dTop=%d [bp.top=%d topLeading=%d]\n", pfd->mBounds.BStart(lineWM), aDistanceFromStart, span ? pfd->mBorderPadding.BStart(frameWM) : 0, span ? span->mBStartLeading : 0); #endif break; case VALIGN_BOTTOM: if (span) { // Compute bottom leading pfd->mBounds.BStart(lineWM) = -aDistanceFromStart + aLineBSize - span->mMaxBCoord; } else { pfd->mBounds.BStart(lineWM) = -aDistanceFromStart + aLineBSize - pfd->mMargin.BEnd(frameWM) - pfd->mBounds.BSize(lineWM); } pfd->mFrame->SetRect(lineWM, pfd->mBounds, mContainerWidth); #ifdef NOISY_BLOCKDIR_ALIGN printf(" "); nsFrame::ListTag(stdout, pfd->mFrame); printf(": y=%d\n", pfd->mBounds.BStart(lineWM)); #endif break; } if (span) { nscoord fromStart = aDistanceFromStart + pfd->mBounds.BStart(lineWM); PlaceTopBottomFrames(span, fromStart, aLineBSize); } } } static float GetInflationForBlockDirAlignment(nsIFrame* aFrame, nscoord aInflationMinFontSize) { if (aFrame->IsSVGText()) { const nsIFrame* container = nsLayoutUtils::GetClosestFrameOfType(aFrame, nsGkAtoms::svgTextFrame); NS_ASSERTION(container, "expected to find an ancestor SVGTextFrame"); return static_cast(container)->GetFontSizeScaleFactor(); } return nsLayoutUtils::FontSizeInflationInner(aFrame, aInflationMinFontSize); } #define BLOCKDIR_ALIGN_FRAMES_NO_MINIMUM nscoord_MAX #define BLOCKDIR_ALIGN_FRAMES_NO_MAXIMUM nscoord_MIN // Place frames in the block direction within a given span (CSS property // vertical-align) Note: this doesn't place frames with vertical-align: // top or bottom as those have to wait until the entire line box block // size is known. This is called after the span frame has finished being // reflowed so that we know its block size. void nsLineLayout::VerticalAlignFrames(PerSpanData* psd) { // Get parent frame info PerFrameData* spanFramePFD = psd->mFrame; nsIFrame* spanFrame = spanFramePFD->mFrame; // Get the parent frame's font for all of the frames in this span nsRefPtr fm; float inflation = GetInflationForBlockDirAlignment(spanFrame, mInflationMinFontSize); nsLayoutUtils::GetFontMetricsForFrame(spanFrame, getter_AddRefs(fm), inflation); mBlockReflowState->rendContext->SetFont(fm); bool preMode = mStyleText->WhiteSpaceIsSignificant(); // See if the span is an empty continuation. It's an empty continuation iff: // - it has a prev-in-flow // - it has no next in flow // - it's zero sized WritingMode frameWM = spanFramePFD->mFrame->GetWritingMode(); WritingMode lineWM = mRootSpan->mWritingMode; bool emptyContinuation = psd != mRootSpan && spanFrame->GetPrevInFlow() && !spanFrame->GetNextInFlow() && spanFramePFD->mBounds.IsZeroSize(); #ifdef NOISY_BLOCKDIR_ALIGN printf("[%sSpan]", (psd == mRootSpan)?"Root":""); nsFrame::ListTag(stdout, spanFrame); printf(": preMode=%s strictMode=%s w/h=%d,%d emptyContinuation=%s", preMode ? "yes" : "no", mPresContext->CompatibilityMode() != eCompatibility_NavQuirks ? "yes" : "no", spanFramePFD->mBounds.ISize(lineWM), spanFramePFD->mBounds.BSize(lineWM), emptyContinuation ? "yes" : "no"); if (psd != mRootSpan) { WritingMode frameWM = spanFramePFD->mFrame->GetWritingMode(); printf(" bp=%d,%d,%d,%d margin=%d,%d,%d,%d", spanFramePFD->mBorderPadding.Top(frameWM), spanFramePFD->mBorderPadding.Right(frameWM), spanFramePFD->mBorderPadding.Bottom(frameWM), spanFramePFD->mBorderPadding.Left(frameWM), spanFramePFD->mMargin.Top(frameWM), spanFramePFD->mMargin.Right(frameWM), spanFramePFD->mMargin.Bottom(frameWM), spanFramePFD->mMargin.Left(frameWM)); } printf("\n"); #endif // Compute the span's mZeroEffectiveSpanBox flag. What we are trying // to determine is how we should treat the span: should it act // "normally" according to css2 or should it effectively // "disappear". // // In general, if the document being processed is in full standards // mode then it should act normally (with one exception). The // exception case is when a span is continued and yet the span is // empty (e.g. compressed whitespace). For this kind of span we treat // it as if it were not there so that it doesn't impact the // line block-size. // // In almost standards mode or quirks mode, we should sometimes make // it disappear. The cases that matter are those where the span // contains no real text elements that would provide an ascent and // descent and height. However, if css style elements have been // applied to the span (border/padding/margin) so that it's clear the // document author is intending css2 behavior then we act as if strict // mode is set. // // This code works correctly for preMode, because a blank line // in PRE mode is encoded as a text node with a LF in it, since // text nodes with only whitespace are considered in preMode. // // Much of this logic is shared with the various implementations of // nsIFrame::IsEmpty since they need to duplicate the way it makes // some lines empty. However, nsIFrame::IsEmpty can't be reused here // since this code sets zeroEffectiveSpanBox even when there are // non-empty children. bool zeroEffectiveSpanBox = false; // XXXldb If we really have empty continuations, then all these other // checks don't make sense for them. // XXXldb This should probably just use nsIFrame::IsSelfEmpty, assuming that // it agrees with this code. (If it doesn't agree, it probably should.) if ((emptyContinuation || mPresContext->CompatibilityMode() != eCompatibility_FullStandards) && ((psd == mRootSpan) || (spanFramePFD->mBorderPadding.IsEmpty() && spanFramePFD->mMargin.IsEmpty()))) { // This code handles an issue with compatibility with non-css // conformant browsers. In particular, there are some cases // where the font-size and line-height for a span must be // ignored and instead the span must *act* as if it were zero // sized. In general, if the span contains any non-compressed // text then we don't use this logic. // However, this is not propagated outwards, since (in compatibility // mode) we don't want big line heights for things like //

Text

// We shouldn't include any whitespace that collapses, unless we're // preformatted (in which case it shouldn't, but the width=0 test is // perhaps incorrect). This includes whitespace at the beginning of // a line and whitespace preceded (?) by other whitespace. // See bug 134580 and bug 155333. zeroEffectiveSpanBox = true; for (PerFrameData* pfd = psd->mFirstFrame; pfd; pfd = pfd->mNext) { if (pfd->GetFlag(PFD_ISTEXTFRAME) && (pfd->GetFlag(PFD_ISNONWHITESPACETEXTFRAME) || preMode || pfd->mBounds.ISize(mRootSpan->mWritingMode) != 0)) { zeroEffectiveSpanBox = false; break; } } } psd->mZeroEffectiveSpanBox = zeroEffectiveSpanBox; // Setup baselineBCoord, minBCoord, and maxBCoord nscoord baselineBCoord, minBCoord, maxBCoord; if (psd == mRootSpan) { // Use a zero baselineBCoord since we don't yet know where the baseline // will be (until we know how tall the line is; then we will // know). In addition, use extreme values for the minBCoord and maxBCoord // values so that only the child frames will impact their values // (since these are children of the block, there is no span box to // provide initial values). baselineBCoord = 0; minBCoord = BLOCKDIR_ALIGN_FRAMES_NO_MINIMUM; maxBCoord = BLOCKDIR_ALIGN_FRAMES_NO_MAXIMUM; #ifdef NOISY_BLOCKDIR_ALIGN printf("[RootSpan]"); nsFrame::ListTag(stdout, spanFrame); printf(": pass1 valign frames: topEdge=%d minLineBSize=%d zeroEffectiveSpanBox=%s\n", mBStartEdge, mMinLineBSize, zeroEffectiveSpanBox ? "yes" : "no"); #endif } else { // Compute the logical block size for this span. The logical block size // is based on the "line-height" value, not the font-size. Also // compute the top leading. float inflation = GetInflationForBlockDirAlignment(spanFrame, mInflationMinFontSize); nscoord logicalBSize = nsHTMLReflowState:: CalcLineHeight(spanFrame->GetContent(), spanFrame->StyleContext(), mBlockReflowState->ComputedHeight(), inflation); nscoord contentBSize = spanFramePFD->mBounds.BSize(lineWM) - spanFramePFD->mBorderPadding.BStart(frameWM) - spanFramePFD->mBorderPadding.BEnd(frameWM); // Special-case for a ::first-letter frame, set the line height to // the frame block size if the user has left line-height == normal if (spanFramePFD->GetFlag(PFD_ISLETTERFRAME) && !spanFrame->GetPrevInFlow() && spanFrame->StyleText()->mLineHeight.GetUnit() == eStyleUnit_Normal) { logicalBSize = spanFramePFD->mBounds.BSize(lineWM); } nscoord leading = logicalBSize - contentBSize; psd->mBStartLeading = leading / 2; psd->mBEndLeading = leading - psd->mBStartLeading; psd->mLogicalBSize = logicalBSize; if (zeroEffectiveSpanBox) { // When the span-box is to be ignored, zero out the initial // values so that the span doesn't impact the final line // height. The contents of the span can impact the final line // height. // Note that things are readjusted for this span after its children // are reflowed minBCoord = BLOCKDIR_ALIGN_FRAMES_NO_MINIMUM; maxBCoord = BLOCKDIR_ALIGN_FRAMES_NO_MAXIMUM; } else { // The initial values for the min and max block coord values are in the // span's coordinate space, and cover the logical block size of the span. // If there are child frames in this span that stick out of this area // then the minBCoord and maxBCoord are updated by the amount of logical // blockSize that is outside this range. minBCoord = spanFramePFD->mBorderPadding.BStart(frameWM) - psd->mBStartLeading; maxBCoord = minBCoord + psd->mLogicalBSize; } // This is the distance from the top edge of the parents visual // box to the baseline. The span already computed this for us, // so just use it. *psd->mBaseline = baselineBCoord = spanFramePFD->mAscent; #ifdef NOISY_BLOCKDIR_ALIGN printf("[%sSpan]", (psd == mRootSpan)?"Root":""); nsFrame::ListTag(stdout, spanFrame); printf(": baseLine=%d logicalBSize=%d topLeading=%d h=%d bp=%d,%d zeroEffectiveSpanBox=%s\n", baselineBCoord, psd->mLogicalBSize, psd->mBStartLeading, spanFramePFD->mBounds.BSize(lineWM), spanFramePFD->mBorderPadding.Top(frameWM), spanFramePFD->mBorderPadding.Bottom(frameWM), zeroEffectiveSpanBox ? "yes" : "no"); #endif } nscoord maxStartBoxBSize = 0; nscoord maxEndBoxBSize = 0; PerFrameData* pfd = psd->mFirstFrame; while (nullptr != pfd) { nsIFrame* frame = pfd->mFrame; WritingMode frameWM = frame->GetWritingMode(); // sanity check (see bug 105168, non-reproducible crashes from null frame) NS_ASSERTION(frame, "null frame in PerFrameData - something is very very bad"); if (!frame) { return; } // Compute the logical block size of the frame nscoord logicalBSize; PerSpanData* frameSpan = pfd->mSpan; if (frameSpan) { // For span frames the logical-block-size and start-leading were // pre-computed when the span was reflowed. logicalBSize = frameSpan->mLogicalBSize; } else { // For other elements the logical block size is the same as the // frame's block size plus its margins. logicalBSize = pfd->mBounds.BSize(lineWM) + pfd->mMargin.BStartEnd(frameWM); if (logicalBSize < 0 && mPresContext->CompatibilityMode() == eCompatibility_NavQuirks) { pfd->mAscent -= logicalBSize; logicalBSize = 0; } } // Get vertical-align property ("vertical-align" is the CSS name for // block-direction align) const nsStyleCoord& verticalAlign = frame->StyleTextReset()->mVerticalAlign; uint8_t verticalAlignEnum = frame->VerticalAlignEnum(); #ifdef NOISY_BLOCKDIR_ALIGN printf(" [frame]"); nsFrame::ListTag(stdout, frame); printf(": verticalAlignUnit=%d (enum == %d", verticalAlign.GetUnit(), ((eStyleUnit_Enumerated == verticalAlign.GetUnit()) ? verticalAlign.GetIntValue() : -1)); if (verticalAlignEnum != nsIFrame::eInvalidVerticalAlign) { printf(", after SVG dominant-baseline conversion == %d", verticalAlignEnum); } printf(")\n"); #endif if (verticalAlignEnum != nsIFrame::eInvalidVerticalAlign) { switch (verticalAlignEnum) { default: case NS_STYLE_VERTICAL_ALIGN_BASELINE: { // The element's baseline is aligned with the baseline of // the parent. pfd->mBounds.BStart(lineWM) = baselineBCoord - pfd->mAscent; pfd->mBlockDirAlign = VALIGN_OTHER; break; } case NS_STYLE_VERTICAL_ALIGN_SUB: { // Lower the baseline of the box to the subscript offset // of the parent's box. This is identical to the baseline // alignment except for the addition of the subscript // offset to the baseline BCoord. nscoord parentSubscript = fm->SubscriptOffset(); nscoord revisedBaselineBCoord = baselineBCoord + parentSubscript; pfd->mBounds.BStart(lineWM) = revisedBaselineBCoord - pfd->mAscent; pfd->mBlockDirAlign = VALIGN_OTHER; break; } case NS_STYLE_VERTICAL_ALIGN_SUPER: { // Raise the baseline of the box to the superscript offset // of the parent's box. This is identical to the baseline // alignment except for the subtraction of the superscript // offset to the baseline BCoord. nscoord parentSuperscript = fm->SuperscriptOffset(); nscoord revisedBaselineBCoord = baselineBCoord - parentSuperscript; pfd->mBounds.BStart(lineWM) = revisedBaselineBCoord - pfd->mAscent; pfd->mBlockDirAlign = VALIGN_OTHER; break; } case NS_STYLE_VERTICAL_ALIGN_TOP: { pfd->mBlockDirAlign = VALIGN_TOP; nscoord subtreeBSize = logicalBSize; if (frameSpan) { subtreeBSize = frameSpan->mMaxBCoord - frameSpan->mMinBCoord; NS_ASSERTION(subtreeBSize >= logicalBSize, "unexpected subtree block size"); } if (subtreeBSize > maxStartBoxBSize) { maxStartBoxBSize = subtreeBSize; } break; } case NS_STYLE_VERTICAL_ALIGN_BOTTOM: { pfd->mBlockDirAlign = VALIGN_BOTTOM; nscoord subtreeBSize = logicalBSize; if (frameSpan) { subtreeBSize = frameSpan->mMaxBCoord - frameSpan->mMinBCoord; NS_ASSERTION(subtreeBSize >= logicalBSize, "unexpected subtree block size"); } if (subtreeBSize > maxEndBoxBSize) { maxEndBoxBSize = subtreeBSize; } break; } case NS_STYLE_VERTICAL_ALIGN_MIDDLE: { // Align the midpoint of the frame with 1/2 the parents // x-height above the baseline. nscoord parentXHeight = fm->XHeight(); if (frameSpan) { pfd->mBounds.BStart(lineWM) = baselineBCoord - (parentXHeight + pfd->mBounds.BSize(lineWM))/2; } else { pfd->mBounds.BStart(lineWM) = baselineBCoord - (parentXHeight + logicalBSize)/2 + pfd->mMargin.BStart(frameWM); } pfd->mBlockDirAlign = VALIGN_OTHER; break; } case NS_STYLE_VERTICAL_ALIGN_TEXT_TOP: { // The top of the logical box is aligned with the top of // the parent element's text. // XXX For vertical text we will need a new API to get the logical // max-ascent here nscoord parentAscent = fm->MaxAscent(); if (frameSpan) { pfd->mBounds.BStart(lineWM) = baselineBCoord - parentAscent - pfd->mBorderPadding.BStart(frameWM) + frameSpan->mBStartLeading; } else { pfd->mBounds.BStart(lineWM) = baselineBCoord - parentAscent + pfd->mMargin.BStart(frameWM); } pfd->mBlockDirAlign = VALIGN_OTHER; break; } case NS_STYLE_VERTICAL_ALIGN_TEXT_BOTTOM: { // The bottom of the logical box is aligned with the // bottom of the parent elements text. nscoord parentDescent = fm->MaxDescent(); if (frameSpan) { pfd->mBounds.BStart(lineWM) = baselineBCoord + parentDescent - pfd->mBounds.BSize(lineWM) + pfd->mBorderPadding.BEnd(frameWM) - frameSpan->mBEndLeading; } else { pfd->mBounds.BStart(lineWM) = baselineBCoord + parentDescent - pfd->mBounds.BSize(lineWM) - pfd->mMargin.BEnd(frameWM); } pfd->mBlockDirAlign = VALIGN_OTHER; break; } case NS_STYLE_VERTICAL_ALIGN_MIDDLE_WITH_BASELINE: { // Align the midpoint of the frame with the baseline of the parent. if (frameSpan) { pfd->mBounds.BStart(lineWM) = baselineBCoord - pfd->mBounds.BSize(lineWM)/2; } else { pfd->mBounds.BStart(lineWM) = baselineBCoord - logicalBSize/2 + pfd->mMargin.BStart(frameWM); } pfd->mBlockDirAlign = VALIGN_OTHER; break; } } } else { // We have either a coord, a percent, or a calc(). nscoord pctBasis = 0; if (verticalAlign.HasPercent()) { // Percentages are like lengths, except treated as a percentage // of the elements line block size value. float inflation = GetInflationForBlockDirAlignment(frame, mInflationMinFontSize); pctBasis = nsHTMLReflowState::CalcLineHeight(frame->GetContent(), frame->StyleContext(), mBlockReflowState->ComputedBSize(), inflation); } nscoord offset = nsRuleNode::ComputeCoordPercentCalc(verticalAlign, pctBasis); // According to the CSS2 spec (10.8.1), a positive value // "raises" the box by the given distance while a negative value // "lowers" the box by the given distance (with zero being the // baseline). Since Y coordinates increase towards the bottom of // the screen we reverse the sign. nscoord revisedBaselineBCoord = baselineBCoord - offset; pfd->mBounds.BStart(lineWM) = revisedBaselineBCoord - pfd->mAscent; pfd->mBlockDirAlign = VALIGN_OTHER; } // Update minBCoord/maxBCoord for frames that we just placed. Do not factor // text into the equation. if (pfd->mBlockDirAlign == VALIGN_OTHER) { // Text frames do not contribute to the min/max Y values for the // line (instead their parent frame's font-size contributes). // XXXrbs -- relax this restriction because it causes text frames // to jam together when 'font-size-adjust' is enabled // and layout is using dynamic font heights (bug 20394) // -- Note #1: With this code enabled and with the fact that we are not // using Em[Ascent|Descent] as nsDimensions for text metrics in // GFX mean that the discussion in bug 13072 cannot hold. // -- Note #2: We still don't want empty-text frames to interfere. // For example in quirks mode, avoiding empty text frames prevents // "tall" lines around elements like
since the rules of
// in quirks.css have pseudo text contents with LF in them. #if 0 if (!pfd->GetFlag(PFD_ISTEXTFRAME)) { #else // Only consider non empty text frames when line-height=normal bool canUpdate = !pfd->GetFlag(PFD_ISTEXTFRAME); if (!canUpdate && pfd->GetFlag(PFD_ISNONWHITESPACETEXTFRAME)) { canUpdate = frame->StyleText()->mLineHeight.GetUnit() == eStyleUnit_Normal; } if (canUpdate) { #endif nscoord blockStart, blockEnd; if (frameSpan) { // For spans that were are now placing, use their position // plus their already computed min-Y and max-Y values for // computing blockStart and blockEnd. blockStart = pfd->mBounds.BStart(lineWM) + frameSpan->mMinBCoord; blockEnd = pfd->mBounds.BStart(lineWM) + frameSpan->mMaxBCoord; } else { blockStart = pfd->mBounds.BStart(lineWM) - pfd->mMargin.BStart(frameWM); blockEnd = blockStart + logicalBSize; } if (!preMode && mPresContext->CompatibilityMode() != eCompatibility_FullStandards && !logicalBSize) { // Check if it's a BR frame that is not alone on its line (it // is given a block size of zero to indicate this), and if so reset // blockStart and blockEnd so that BR frames don't influence the line. if (nsGkAtoms::brFrame == frame->GetType()) { blockStart = BLOCKDIR_ALIGN_FRAMES_NO_MINIMUM; blockEnd = BLOCKDIR_ALIGN_FRAMES_NO_MAXIMUM; } } if (blockStart < minBCoord) minBCoord = blockStart; if (blockEnd > maxBCoord) maxBCoord = blockEnd; #ifdef NOISY_BLOCKDIR_ALIGN printf(" [frame]raw: a=%d h=%d bp=%d,%d logical: h=%d leading=%d y=%d minBCoord=%d maxBCoord=%d\n", pfd->mAscent, pfd->mBounds.BSize(lineWM), pfd->mBorderPadding.Top(frameWM), pfd->mBorderPadding.Bottom(frameWM), logicalBSize, frameSpan ? frameSpan->mBStartLeading : 0, pfd->mBounds.BStart(lineWM), minBCoord, maxBCoord); #endif } if (psd != mRootSpan) { frame->SetRect(lineWM, pfd->mBounds, mContainerWidth); } } pfd = pfd->mNext; } // Factor in the minimum line block-size when handling the root-span for // the block. if (psd == mRootSpan) { // We should factor in the block element's minimum line-height (as // defined in section 10.8.1 of the css2 spec) assuming that // mZeroEffectiveSpanBox is not set on the root span. This only happens // in some cases in quirks mode: // (1) if the root span contains non-whitespace text directly (this // is handled by mZeroEffectiveSpanBox // (2) if this line has a bullet // (3) if this is the last line of an LI, DT, or DD element // (The last line before a block also counts, but not before a // BR) (NN4/IE5 quirk) // (1) and (2) above bool applyMinLH = !psd->mZeroEffectiveSpanBox || mHasBullet; bool isLastLine = (!mLineBox->IsLineWrapped() && !mLineEndsInBR); if (!applyMinLH && isLastLine) { nsIContent* blockContent = mRootSpan->mFrame->mFrame->GetContent(); if (blockContent) { nsIAtom *blockTagAtom = blockContent->Tag(); // (3) above, if the last line of LI, DT, or DD if (blockTagAtom == nsGkAtoms::li || blockTagAtom == nsGkAtoms::dt || blockTagAtom == nsGkAtoms::dd) { applyMinLH = true; } } } if (applyMinLH) { if (psd->mHasNonemptyContent || preMode || mHasBullet) { #ifdef NOISY_BLOCKDIR_ALIGN printf(" [span]==> adjusting min/maxBCoord: currentValues: %d,%d", minBCoord, maxBCoord); #endif nscoord minimumLineBSize = mMinLineBSize; nscoord blockStart = -nsLayoutUtils::GetCenteredFontBaseline(fm, minimumLineBSize); nscoord blockEnd = blockStart + minimumLineBSize; if (blockStart < minBCoord) minBCoord = blockStart; if (blockEnd > maxBCoord) maxBCoord = blockEnd; #ifdef NOISY_BLOCKDIR_ALIGN printf(" new values: %d,%d\n", minBCoord, maxBCoord); #endif #ifdef NOISY_BLOCKDIR_ALIGN printf(" Used mMinLineBSize: %d, blockStart: %d, blockEnd: %d\n", mMinLineBSize, blockStart, blockEnd); #endif } else { // XXX issues: // [1] BR's on empty lines stop working // [2] May not honor css2's notion of handling empty elements // [3] blank lines in a pre-section ("\n") (handled with preMode) // XXX Are there other problems with this? #ifdef NOISY_BLOCKDIR_ALIGN printf(" [span]==> zapping min/maxBCoord: currentValues: %d,%d newValues: 0,0\n", minBCoord, maxBCoord); #endif minBCoord = maxBCoord = 0; } } } if ((minBCoord == BLOCKDIR_ALIGN_FRAMES_NO_MINIMUM) || (maxBCoord == BLOCKDIR_ALIGN_FRAMES_NO_MAXIMUM)) { minBCoord = maxBCoord = baselineBCoord; } if ((psd != mRootSpan) && (psd->mZeroEffectiveSpanBox)) { #ifdef NOISY_BLOCKDIR_ALIGN printf(" [span]adjusting for zeroEffectiveSpanBox\n"); printf(" Original: minBCoord=%d, maxBCoord=%d, bSize=%d, ascent=%d, logicalBSize=%d, topLeading=%d, bottomLeading=%d\n", minBCoord, maxBCoord, spanFramePFD->mBounds.BSize(frameWM), spanFramePFD->mAscent, psd->mLogicalBSize, psd->mBStartLeading, psd->mBEndLeading); #endif nscoord goodMinBCoord = spanFramePFD->mBorderPadding.BStart(frameWM) - psd->mBStartLeading; nscoord goodMaxBCoord = goodMinBCoord + psd->mLogicalBSize; // For cases like the one in bug 714519 (text-decoration placement // or making nsLineLayout::IsZeroBSize() handle // vertical-align:top/bottom on a descendant of the line that's not // a child of it), we want to treat elements that are // vertical-align: top or bottom somewhat like children for the // purposes of this quirk. To some extent, this is guessing, since // they might end up being aligned anywhere. However, we'll guess // that they'll be placed aligned with the top or bottom of this // frame (as though this frame is the only thing in the line). // (Guessing isn't crazy, since all we're doing is reducing the // scope of a quirk and making the behavior more standards-like.) if (maxStartBoxBSize > maxBCoord - minBCoord) { // Distribute maxStartBoxBSize to ascent (baselineBCoord - minBCoord), and // then to descent (maxBCoord - baselineBCoord) by adjusting minBCoord or // maxBCoord, but not to exceed goodMinBCoord and goodMaxBCoord. nscoord distribute = maxStartBoxBSize - (maxBCoord - minBCoord); nscoord ascentSpace = std::max(minBCoord - goodMinBCoord, 0); if (distribute > ascentSpace) { distribute -= ascentSpace; minBCoord -= ascentSpace; nscoord descentSpace = std::max(goodMaxBCoord - maxBCoord, 0); if (distribute > descentSpace) { maxBCoord += descentSpace; } else { maxBCoord += distribute; } } else { minBCoord -= distribute; } } if (maxEndBoxBSize > maxBCoord - minBCoord) { // Likewise, but preferring descent to ascent. nscoord distribute = maxEndBoxBSize - (maxBCoord - minBCoord); nscoord descentSpace = std::max(goodMaxBCoord - maxBCoord, 0); if (distribute > descentSpace) { distribute -= descentSpace; maxBCoord += descentSpace; nscoord ascentSpace = std::max(minBCoord - goodMinBCoord, 0); if (distribute > ascentSpace) { minBCoord -= ascentSpace; } else { minBCoord -= distribute; } } else { maxBCoord += distribute; } } if (minBCoord > goodMinBCoord) { nscoord adjust = minBCoord - goodMinBCoord; // positive // shrink the logical extents psd->mLogicalBSize -= adjust; psd->mBStartLeading -= adjust; } if (maxBCoord < goodMaxBCoord) { nscoord adjust = goodMaxBCoord - maxBCoord; psd->mLogicalBSize -= adjust; psd->mBEndLeading -= adjust; } if (minBCoord > 0) { // shrink the content by moving its block start down. This is tricky, // since the block start is the 0 for many coordinates, so what we do is // move everything else up. spanFramePFD->mAscent -= minBCoord; // move the baseline up spanFramePFD->mBounds.BSize(lineWM) -= minBCoord; // move the block end up psd->mBStartLeading += minBCoord; *psd->mBaseline -= minBCoord; pfd = psd->mFirstFrame; while (nullptr != pfd) { pfd->mBounds.BStart(lineWM) -= minBCoord; // move all the children // back up pfd->mFrame->SetRect(lineWM, pfd->mBounds, mContainerWidth); pfd = pfd->mNext; } maxBCoord -= minBCoord; // since minBCoord is in the frame's own // coordinate system minBCoord = 0; } if (maxBCoord < spanFramePFD->mBounds.BSize(lineWM)) { nscoord adjust = spanFramePFD->mBounds.BSize(lineWM) - maxBCoord; spanFramePFD->mBounds.BSize(lineWM) -= adjust; // move the bottom up psd->mBEndLeading += adjust; } #ifdef NOISY_BLOCKDIR_ALIGN printf(" New: minBCoord=%d, maxBCoord=%d, bSize=%d, ascent=%d, logicalBSize=%d, topLeading=%d, bottomLeading=%d\n", minBCoord, maxBCoord, spanFramePFD->mBounds.BSize(lineWM), spanFramePFD->mAscent, psd->mLogicalBSize, psd->mBStartLeading, psd->mBEndLeading); #endif } psd->mMinBCoord = minBCoord; psd->mMaxBCoord = maxBCoord; #ifdef NOISY_BLOCKDIR_ALIGN printf(" [span]==> minBCoord=%d maxBCoord=%d delta=%d maxStartBoxBSize=%d maxEndBoxBSize=%d\n", minBCoord, maxBCoord, maxBCoord - minBCoord, maxStartBoxBSize, maxEndBoxBSize); #endif if (maxStartBoxBSize > mMaxStartBoxBSize) { mMaxStartBoxBSize = maxStartBoxBSize; } if (maxEndBoxBSize > mMaxEndBoxBSize) { mMaxEndBoxBSize = maxEndBoxBSize; } } static void SlideSpanFrameRect(nsIFrame* aFrame, nscoord aDeltaWidth) { // This should not use nsIFrame::MovePositionBy because it happens // prior to relative positioning. In particular, because // nsBlockFrame::PlaceLine calls aLineLayout.TrimTrailingWhiteSpace() // prior to calling aLineLayout.RelativePositionFrames(). nsPoint p = aFrame->GetPosition(); p.x -= aDeltaWidth; aFrame->SetPosition(p); } bool nsLineLayout::TrimTrailingWhiteSpaceIn(PerSpanData* psd, nscoord* aDeltaISize) { PerFrameData* pfd = psd->mFirstFrame; if (!pfd) { *aDeltaISize = 0; return false; } pfd = pfd->Last(); while (nullptr != pfd) { #ifdef REALLY_NOISY_TRIM nsFrame::ListTag(stdout, (psd == mRootSpan ? mBlockReflowState->frame : psd->mFrame->mFrame)); printf(": attempting trim of "); nsFrame::ListTag(stdout, pfd->mFrame); printf("\n"); #endif PerSpanData* childSpan = pfd->mSpan; WritingMode lineWM = mRootSpan->mWritingMode; if (childSpan) { // Maybe the child span has the trailing white-space in it? if (TrimTrailingWhiteSpaceIn(childSpan, aDeltaISize)) { nscoord deltaISize = *aDeltaISize; if (deltaISize) { // Adjust the child spans frame size pfd->mBounds.ISize(lineWM) -= deltaISize; if (psd != mRootSpan) { // When the child span is not a direct child of the block // we need to update the child spans frame rectangle // because it most likely will not be done again. Spans // that are direct children of the block will be updated // later, however, because the VerticalAlignFrames method // will be run after this method. nsIFrame* f = pfd->mFrame; LogicalRect r(lineWM, f->GetRect(), mContainerWidth); r.ISize(lineWM) -= deltaISize; f->SetRect(lineWM, r, mContainerWidth); } // Adjust the inline end edge of the span that contains the child span psd->mICoord -= deltaISize; // Slide any frames that follow the child span over by the // correct amount. The only thing that can follow the child // span is empty stuff, so we are just making things // sensible (keeping the combined area honest). while (pfd->mNext) { pfd = pfd->mNext; pfd->mBounds.IStart(lineWM) -= deltaISize; if (psd != mRootSpan) { // When the child span is not a direct child of the block // we need to update the child span's frame rectangle // because it most likely will not be done again. Spans // that are direct children of the block will be updated // later, however, because the VerticalAlignFrames method // will be run after this method. SlideSpanFrameRect(pfd->mFrame, deltaISize); } } } return true; } } else if (!pfd->GetFlag(PFD_ISTEXTFRAME) && !pfd->GetFlag(PFD_SKIPWHENTRIMMINGWHITESPACE)) { // If we hit a frame on the end that's not text and not a placeholder, // then there is no trailing whitespace to trim. Stop the search. *aDeltaISize = 0; return true; } else if (pfd->GetFlag(PFD_ISTEXTFRAME)) { // Call TrimTrailingWhiteSpace even on empty textframes because they // might have a soft hyphen which should now appear, changing the frame's // width nsTextFrame::TrimOutput trimOutput = static_cast(pfd->mFrame)-> TrimTrailingWhiteSpace(mBlockReflowState->rendContext); #ifdef NOISY_TRIM nsFrame::ListTag(stdout, (psd == mRootSpan ? mBlockReflowState->frame : psd->mFrame->mFrame)); printf(": trim of "); nsFrame::ListTag(stdout, pfd->mFrame); printf(" returned %d\n", trimOutput.mDeltaWidth); #endif if (trimOutput.mLastCharIsJustifiable && pfd->mJustificationNumSpaces > 0) { pfd->mJustificationNumSpaces--; } if (trimOutput.mChanged) { pfd->SetFlag(PFD_RECOMPUTEOVERFLOW, true); } if (trimOutput.mDeltaWidth) { pfd->mBounds.ISize(lineWM) -= trimOutput.mDeltaWidth; // See if the text frame has already been placed in its parent if (psd != mRootSpan) { // The frame was already placed during psd's // reflow. Update the frames rectangle now. pfd->mFrame->SetRect(lineWM, pfd->mBounds, mContainerWidth); } // Adjust containing span's right edge psd->mICoord -= trimOutput.mDeltaWidth; // Slide any frames that follow the text frame over by the // right amount. The only thing that can follow the text // frame is empty stuff, so we are just making things // sensible (keeping the combined area honest). while (pfd->mNext) { pfd = pfd->mNext; pfd->mBounds.IStart(lineWM) -= trimOutput.mDeltaWidth; if (psd != mRootSpan) { // When the child span is not a direct child of the block // we need to update the child spans frame rectangle // because it most likely will not be done again. Spans // that are direct children of the block will be updated // later, however, because the VerticalAlignFrames method // will be run after this method. SlideSpanFrameRect(pfd->mFrame, trimOutput.mDeltaWidth); } } } if (pfd->GetFlag(PFD_ISNONEMPTYTEXTFRAME) || trimOutput.mChanged) { // Pass up to caller so they can shrink their span *aDeltaISize = trimOutput.mDeltaWidth; return true; } } pfd = pfd->mPrev; } *aDeltaISize = 0; return false; } bool nsLineLayout::TrimTrailingWhiteSpace() { PerSpanData* psd = mRootSpan; nscoord deltaISize; TrimTrailingWhiteSpaceIn(psd, &deltaISize); return 0 != deltaISize; } void nsLineLayout::ComputeJustificationWeights(PerSpanData* aPSD, int32_t* aNumSpaces, int32_t* aNumLetters) { NS_ASSERTION(aPSD, "null arg"); NS_ASSERTION(aNumSpaces, "null arg"); NS_ASSERTION(aNumLetters, "null arg"); int32_t numSpaces = 0; int32_t numLetters = 0; for (PerFrameData* pfd = aPSD->mFirstFrame; pfd != nullptr; pfd = pfd->mNext) { if (true == pfd->GetFlag(PFD_ISTEXTFRAME)) { numSpaces += pfd->mJustificationNumSpaces; numLetters += pfd->mJustificationNumLetters; } else if (pfd->mSpan != nullptr) { int32_t spanSpaces; int32_t spanLetters; ComputeJustificationWeights(pfd->mSpan, &spanSpaces, &spanLetters); numSpaces += spanSpaces; numLetters += spanLetters; } } *aNumSpaces = numSpaces; *aNumLetters = numLetters; } nscoord nsLineLayout::ApplyFrameJustification(PerSpanData* aPSD, FrameJustificationState* aState) { NS_ASSERTION(aPSD, "null arg"); NS_ASSERTION(aState, "null arg"); nscoord deltaICoord = 0; for (PerFrameData* pfd = aPSD->mFirstFrame; pfd != nullptr; pfd = pfd->mNext) { // Don't reposition bullets (and other frames that occur out of X-order?) if (!pfd->GetFlag(PFD_ISBULLET)) { nscoord dw = 0; WritingMode lineWM = mRootSpan->mWritingMode; pfd->mBounds.IStart(lineWM) += deltaICoord; if (true == pfd->GetFlag(PFD_ISTEXTFRAME)) { if (aState->mTotalWidthForSpaces > 0 && aState->mTotalNumSpaces > 0) { aState->mNumSpacesProcessed += pfd->mJustificationNumSpaces; nscoord newAllocatedWidthForSpaces = (aState->mTotalWidthForSpaces*aState->mNumSpacesProcessed) /aState->mTotalNumSpaces; dw += newAllocatedWidthForSpaces - aState->mWidthForSpacesProcessed; aState->mWidthForSpacesProcessed = newAllocatedWidthForSpaces; } if (aState->mTotalWidthForLetters > 0 && aState->mTotalNumLetters > 0) { aState->mNumLettersProcessed += pfd->mJustificationNumLetters; nscoord newAllocatedWidthForLetters = (aState->mTotalWidthForLetters*aState->mNumLettersProcessed) /aState->mTotalNumLetters; dw += newAllocatedWidthForLetters - aState->mWidthForLettersProcessed; aState->mWidthForLettersProcessed = newAllocatedWidthForLetters; } if (dw) { pfd->SetFlag(PFD_RECOMPUTEOVERFLOW, true); } } else { if (nullptr != pfd->mSpan) { dw += ApplyFrameJustification(pfd->mSpan, aState); } } pfd->mBounds.ISize(lineWM) += dw; deltaICoord += dw; pfd->mFrame->SetRect(lineWM, pfd->mBounds, mContainerWidth); } } return deltaICoord; } // Align inline frames within the line according to the CSS text-align // property. void nsLineLayout::TextAlignLine(nsLineBox* aLine, bool aIsLastLine) { /** * NOTE: aIsLastLine ain't necessarily so: it is correctly set by caller * only in cases where the last line needs special handling. */ PerSpanData* psd = mRootSpan; WritingMode lineWM = psd->mWritingMode; NS_WARN_IF_FALSE(psd->mIEnd != NS_UNCONSTRAINEDSIZE, "have unconstrained width; this should only result from " "very large sizes, not attempts at intrinsic width " "calculation"); nscoord availISize = psd->mIEnd - psd->mIStart; nscoord remainingISize = availISize - aLine->ISize(); #ifdef NOISY_INLINEDIR_ALIGN nsFrame::ListTag(stdout, mBlockReflowState->frame); printf(": availISize=%d lineBounds.IStart=%d lineISize=%d delta=%d\n", availISize, aLine->IStart(), aLine->ISize(), remainingISize); #endif // 'text-align-last: auto' is equivalent to the value of the 'text-align' // property except when 'text-align' is set to 'justify', in which case it // is 'justify' when 'text-justify' is 'distribute' and 'start' otherwise. // // XXX: the code below will have to change when we implement text-justify // nscoord dx = 0; uint8_t textAlign = mStyleText->mTextAlign; bool textAlignTrue = mStyleText->mTextAlignTrue; if (aIsLastLine) { textAlignTrue = mStyleText->mTextAlignLastTrue; if (mStyleText->mTextAlignLast == NS_STYLE_TEXT_ALIGN_AUTO) { if (textAlign == NS_STYLE_TEXT_ALIGN_JUSTIFY) { textAlign = NS_STYLE_TEXT_ALIGN_DEFAULT; } } else { textAlign = mStyleText->mTextAlignLast; } } if ((remainingISize > 0 || textAlignTrue) && !(mBlockReflowState->frame->IsSVGText())) { switch (textAlign) { case NS_STYLE_TEXT_ALIGN_JUSTIFY: int32_t numSpaces; int32_t numLetters; ComputeJustificationWeights(psd, &numSpaces, &numLetters); if (numSpaces > 0) { FrameJustificationState state = { numSpaces, numLetters, remainingISize, 0, 0, 0, 0, 0 }; // Apply the justification, and make sure to update our linebox // width to account for it. aLine->ExpandBy(ApplyFrameJustification(psd, &state), mContainerWidth); break; } // Fall through to the default case if we could not justify to fill // the space. case NS_STYLE_TEXT_ALIGN_DEFAULT: // default alignment is to start edge so do nothing break; case NS_STYLE_TEXT_ALIGN_LEFT: case NS_STYLE_TEXT_ALIGN_MOZ_LEFT: if (!lineWM.IsBidiLTR()) { dx = remainingISize; } break; case NS_STYLE_TEXT_ALIGN_RIGHT: case NS_STYLE_TEXT_ALIGN_MOZ_RIGHT: if (lineWM.IsBidiLTR()) { dx = remainingISize; } break; case NS_STYLE_TEXT_ALIGN_END: dx = remainingISize; break; case NS_STYLE_TEXT_ALIGN_CENTER: case NS_STYLE_TEXT_ALIGN_MOZ_CENTER: dx = remainingISize / 2; break; } } if (dx) { for (PerFrameData* pfd = psd->mFirstFrame; pfd; pfd = pfd->mNext) { pfd->mBounds.IStart(lineWM) += dx; pfd->mFrame->SetRect(lineWM, pfd->mBounds, mContainerWidth); } aLine->IndentBy(dx, mContainerWidth); } if (mPresContext->BidiEnabled() && (!mPresContext->IsVisualMode() || !lineWM.IsBidiLTR())) { nsBidiPresUtils::ReorderFrames(psd->mFirstFrame->mFrame, aLine->GetChildCount(), lineWM, mContainerWidth); } } void nsLineLayout::RelativePositionFrames(nsOverflowAreas& aOverflowAreas) { RelativePositionFrames(mRootSpan, aOverflowAreas); } void nsLineLayout::RelativePositionFrames(PerSpanData* psd, nsOverflowAreas& aOverflowAreas) { nsOverflowAreas overflowAreas; WritingMode wm = psd->mWritingMode; if (nullptr != psd->mFrame) { // The span's overflow areas come in three parts: // -- this frame's width and height // -- pfd->mOverflowAreas, which is the area of a bullet or the union // of a relatively positioned frame's absolute children // -- the bounds of all inline descendants // The former two parts are computed right here, we gather the descendants // below. // At this point psd->mFrame->mBounds might be out of date since // bidi reordering can move and resize the frames. So use the frame's // rect instead of mBounds. nsRect adjustedBounds(nsPoint(0, 0), psd->mFrame->mFrame->GetSize()); overflowAreas.ScrollableOverflow().UnionRect( psd->mFrame->mOverflowAreas.ScrollableOverflow(), adjustedBounds); overflowAreas.VisualOverflow().UnionRect( psd->mFrame->mOverflowAreas.VisualOverflow(), adjustedBounds); } else { LogicalRect rect(wm, psd->mIStart, mBStartEdge, psd->mICoord - psd->mIStart, mFinalLineBSize); // The minimum combined area for the frames that are direct // children of the block starts at the upper left corner of the // line and is sized to match the size of the line's bounding box // (the same size as the values returned from VerticalAlignFrames) overflowAreas.VisualOverflow() = rect.GetPhysicalRect(wm, mContainerWidth); overflowAreas.ScrollableOverflow() = overflowAreas.VisualOverflow(); } for (PerFrameData* pfd = psd->mFirstFrame; pfd; pfd = pfd->mNext) { nsIFrame* frame = pfd->mFrame; nsPoint origin = frame->GetPosition(); // Adjust the origin of the frame if (pfd->GetFlag(PFD_RELATIVEPOS)) { //XXX temporary until ApplyRelativePositioning can handle logical offsets nsMargin physicalOffsets = pfd->mOffsets.GetPhysicalMargin(pfd->mFrame->GetWritingMode()); // right and bottom are handled by // nsHTMLReflowState::ComputeRelativeOffsets nsHTMLReflowState::ApplyRelativePositioning(pfd->mFrame, physicalOffsets, &origin); frame->SetPosition(origin); } // We must position the view correctly before positioning its // descendants so that widgets are positioned properly (since only // some views have widgets). if (frame->HasView()) nsContainerFrame::SyncFrameViewAfterReflow(mPresContext, frame, frame->GetView(), pfd->mOverflowAreas.VisualOverflow(), NS_FRAME_NO_SIZE_VIEW); // Note: the combined area of a child is in its coordinate // system. We adjust the childs combined area into our coordinate // system before computing the aggregated value by adding in // x and y which were computed above. nsOverflowAreas r; if (pfd->mSpan) { // Compute a new combined area for the child span before // aggregating it into our combined area. RelativePositionFrames(pfd->mSpan, r); } else { r = pfd->mOverflowAreas; if (pfd->GetFlag(PFD_ISTEXTFRAME)) { // We need to recompute overflow areas in two cases: // (1) When PFD_RECOMPUTEOVERFLOW is set due to trimming // (2) When there are text decorations, since we can't recompute the // overflow area until Reflow and VerticalAlignLine have finished if (pfd->GetFlag(PFD_RECOMPUTEOVERFLOW) || frame->StyleContext()->HasTextDecorationLines()) { nsTextFrame* f = static_cast(frame); r = f->RecomputeOverflow(*mBlockReflowState); } frame->FinishAndStoreOverflow(r, frame->GetSize()); } // If we have something that's not an inline but with a complex frame // hierarchy inside that contains views, they need to be // positioned. // All descendant views must be repositioned even if this frame // does have a view in case this frame's view does not have a // widget and some of the descendant views do have widgets -- // otherwise the widgets won't be repositioned. nsContainerFrame::PositionChildViews(frame); } // Do this here (rather than along with setting the overflow rect // below) so we get leaf frames as well. No need to worry // about the root span, since it doesn't have a frame. if (frame->HasView()) nsContainerFrame::SyncFrameViewAfterReflow(mPresContext, frame, frame->GetView(), r.VisualOverflow(), NS_FRAME_NO_MOVE_VIEW); overflowAreas.UnionWith(r + origin); } // If we just computed a spans combined area, we need to update its // overflow rect... if (psd->mFrame) { PerFrameData* spanPFD = psd->mFrame; nsIFrame* frame = spanPFD->mFrame; frame->FinishAndStoreOverflow(overflowAreas, frame->GetSize()); } aOverflowAreas = overflowAreas; }