/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ // vim:cindent:ts=2:et:sw=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/. */ /* * rendering object for CSS display:block, inline-block, and list-item * boxes, also used for various anonymous boxes */ #include "nsBlockFrame.h" #include "mozilla/DebugOnly.h" #include "mozilla/Maybe.h" #include "mozilla/UniquePtr.h" #include "nsCOMPtr.h" #include "nsAbsoluteContainingBlock.h" #include "nsBlockReflowContext.h" #include "BlockReflowInput.h" #include "nsBulletFrame.h" #include "nsFontMetrics.h" #include "nsLineBox.h" #include "nsLineLayout.h" #include "nsPlaceholderFrame.h" #include "nsStyleConsts.h" #include "nsFrameManager.h" #include "nsPresContext.h" #include "nsIPresShell.h" #include "nsStyleContext.h" #include "nsHTMLParts.h" #include "nsGkAtoms.h" #include "nsGenericHTMLElement.h" #include "nsAttrValueInlines.h" #include "mozilla/Sprintf.h" #include "nsFloatManager.h" #include "prenv.h" #include "plstr.h" #include "nsError.h" #include "nsIScrollableFrame.h" #include #ifdef ACCESSIBILITY #include "nsIDOMHTMLDocument.h" #endif #include "nsLayoutUtils.h" #include "nsDisplayList.h" #include "nsCSSAnonBoxes.h" #include "nsCSSFrameConstructor.h" #include "nsRenderingContext.h" #include "TextOverflow.h" #include "nsIFrameInlines.h" #include "CounterStyleManager.h" #include "nsISelection.h" #include "mozilla/dom/HTMLDetailsElement.h" #include "mozilla/dom/HTMLSummaryElement.h" #include "mozilla/StyleSetHandle.h" #include "mozilla/StyleSetHandleInlines.h" #include "nsBidiPresUtils.h" #include static const int MIN_LINES_NEEDING_CURSOR = 20; static const char16_t kDiscCharacter = 0x2022; using namespace mozilla; using namespace mozilla::css; using namespace mozilla::dom; using namespace mozilla::layout; typedef nsAbsoluteContainingBlock::AbsPosReflowFlags AbsPosReflowFlags; static void MarkAllDescendantLinesDirty(nsBlockFrame* aBlock) { nsLineList::iterator line = aBlock->LinesBegin(); nsLineList::iterator endLine = aBlock->LinesEnd(); while (line != endLine) { if (line->IsBlock()) { nsIFrame* f = line->mFirstChild; nsBlockFrame* bf = nsLayoutUtils::GetAsBlock(f); if (bf) { MarkAllDescendantLinesDirty(bf); } } line->MarkDirty(); ++line; } } static void MarkSameFloatManagerLinesDirty(nsBlockFrame* aBlock) { nsBlockFrame* blockWithFloatMgr = aBlock; while (!(blockWithFloatMgr->GetStateBits() & NS_BLOCK_FLOAT_MGR)) { nsBlockFrame* bf = nsLayoutUtils::GetAsBlock(blockWithFloatMgr->GetParent()); if (!bf) { break; } blockWithFloatMgr = bf; } // Mark every line at and below the line where the float was // dirty, and mark their lines dirty too. We could probably do // something more efficient --- e.g., just dirty the lines that intersect // the float vertically. MarkAllDescendantLinesDirty(blockWithFloatMgr); } /** * Returns true if aFrame is a block that has one or more float children. */ static bool BlockHasAnyFloats(nsIFrame* aFrame) { nsBlockFrame* block = nsLayoutUtils::GetAsBlock(aFrame); if (!block) return false; if (block->GetChildList(nsIFrame::kFloatList).FirstChild()) return true; nsLineList::iterator line = block->LinesBegin(); nsLineList::iterator endLine = block->LinesEnd(); while (line != endLine) { if (line->IsBlock() && BlockHasAnyFloats(line->mFirstChild)) return true; ++line; } return false; } #ifdef DEBUG #include "nsBlockDebugFlags.h" bool nsBlockFrame::gLamePaintMetrics; bool nsBlockFrame::gLameReflowMetrics; bool nsBlockFrame::gNoisy; bool nsBlockFrame::gNoisyDamageRepair; bool nsBlockFrame::gNoisyIntrinsic; bool nsBlockFrame::gNoisyReflow; bool nsBlockFrame::gReallyNoisyReflow; bool nsBlockFrame::gNoisyFloatManager; bool nsBlockFrame::gVerifyLines; bool nsBlockFrame::gDisableResizeOpt; int32_t nsBlockFrame::gNoiseIndent; struct BlockDebugFlags { const char* name; bool* on; }; static const BlockDebugFlags gFlags[] = { { "reflow", &nsBlockFrame::gNoisyReflow }, { "really-noisy-reflow", &nsBlockFrame::gReallyNoisyReflow }, { "intrinsic", &nsBlockFrame::gNoisyIntrinsic }, { "float-manager", &nsBlockFrame::gNoisyFloatManager }, { "verify-lines", &nsBlockFrame::gVerifyLines }, { "damage-repair", &nsBlockFrame::gNoisyDamageRepair }, { "lame-paint-metrics", &nsBlockFrame::gLamePaintMetrics }, { "lame-reflow-metrics", &nsBlockFrame::gLameReflowMetrics }, { "disable-resize-opt", &nsBlockFrame::gDisableResizeOpt }, }; #define NUM_DEBUG_FLAGS (sizeof(gFlags) / sizeof(gFlags[0])) static void ShowDebugFlags() { printf("Here are the available GECKO_BLOCK_DEBUG_FLAGS:\n"); const BlockDebugFlags* bdf = gFlags; const BlockDebugFlags* end = gFlags + NUM_DEBUG_FLAGS; for (; bdf < end; bdf++) { printf(" %s\n", bdf->name); } printf("Note: GECKO_BLOCK_DEBUG_FLAGS is a comma separated list of flag\n"); printf("names (no whitespace)\n"); } void nsBlockFrame::InitDebugFlags() { static bool firstTime = true; if (firstTime) { firstTime = false; char* flags = PR_GetEnv("GECKO_BLOCK_DEBUG_FLAGS"); if (flags) { bool error = false; for (;;) { char* cm = PL_strchr(flags, ','); if (cm) *cm = '\0'; bool found = false; const BlockDebugFlags* bdf = gFlags; const BlockDebugFlags* end = gFlags + NUM_DEBUG_FLAGS; for (; bdf < end; bdf++) { if (PL_strcasecmp(bdf->name, flags) == 0) { *(bdf->on) = true; printf("nsBlockFrame: setting %s debug flag on\n", bdf->name); gNoisy = true; found = true; break; } } if (!found) { error = true; } if (!cm) break; *cm = ','; flags = cm + 1; } if (error) { ShowDebugFlags(); } } } } #endif //---------------------------------------------------------------------- // Debugging support code #ifdef DEBUG const char* nsBlockFrame::kReflowCommandType[] = { "ContentChanged", "StyleChanged", "ReflowDirty", "Timeout", "UserDefined", }; const char* nsBlockFrame::LineReflowStatusToString(LineReflowStatus aLineReflowStatus) const { switch (aLineReflowStatus) { case LineReflowStatus::OK: return "LINE_REFLOW_OK"; case LineReflowStatus::Stop: return "LINE_REFLOW_STOP"; case LineReflowStatus::RedoNoPull: return "LINE_REFLOW_REDO_NO_PULL"; case LineReflowStatus::RedoMoreFloats: return "LINE_REFLOW_REDO_MORE_FLOATS"; case LineReflowStatus::RedoNextBand: return "LINE_REFLOW_REDO_NEXT_BAND"; case LineReflowStatus::Truncated: return "LINE_REFLOW_TRUNCATED"; } return "unknown"; } #endif #ifdef REFLOW_STATUS_COVERAGE static void RecordReflowStatus(bool aChildIsBlock, nsReflowStatus aFrameReflowStatus) { static uint32_t record[2]; // 0: child-is-block // 1: child-is-inline int index = 0; if (!aChildIsBlock) index |= 1; // Compute new status uint32_t newS = record[index]; if (NS_INLINE_IS_BREAK(aFrameReflowStatus)) { if (NS_INLINE_IS_BREAK_BEFORE(aFrameReflowStatus)) { newS |= 1; } else if (NS_FRAME_IS_NOT_COMPLETE(aFrameReflowStatus)) { newS |= 2; } else { newS |= 4; } } else if (NS_FRAME_IS_NOT_COMPLETE(aFrameReflowStatus)) { newS |= 8; } else { newS |= 16; } // Log updates to the status that yield different values if (record[index] != newS) { record[index] = newS; printf("record(%d): %02x %02x\n", index, record[0], record[1]); } } #endif NS_DECLARE_FRAME_PROPERTY_WITH_DTOR_NEVER_CALLED(OverflowLinesProperty, nsBlockFrame::FrameLines) NS_DECLARE_FRAME_PROPERTY_FRAMELIST(OverflowOutOfFlowsProperty) NS_DECLARE_FRAME_PROPERTY_FRAMELIST(PushedFloatProperty) NS_DECLARE_FRAME_PROPERTY_FRAMELIST(OutsideBulletProperty) NS_DECLARE_FRAME_PROPERTY_WITHOUT_DTOR(InsideBulletProperty, nsBulletFrame) NS_DECLARE_FRAME_PROPERTY_SMALL_VALUE(BlockEndEdgeOfChildrenProperty, nscoord) //---------------------------------------------------------------------- nsBlockFrame* NS_NewBlockFrame(nsIPresShell* aPresShell, nsStyleContext* aContext) { return new (aPresShell) nsBlockFrame(aContext); } nsBlockFrame* NS_NewBlockFormattingContext(nsIPresShell* aPresShell, nsStyleContext* aStyleContext) { nsBlockFrame* blockFrame = NS_NewBlockFrame(aPresShell, aStyleContext); blockFrame->AddStateBits(NS_BLOCK_FLOAT_MGR | NS_BLOCK_MARGIN_ROOT); return blockFrame; } NS_IMPL_FRAMEARENA_HELPERS(nsBlockFrame) nsBlockFrame::~nsBlockFrame() { } void nsBlockFrame::DestroyFrom(nsIFrame* aDestructRoot) { ClearLineCursor(); DestroyAbsoluteFrames(aDestructRoot); mFloats.DestroyFramesFrom(aDestructRoot); nsPresContext* presContext = PresContext(); nsIPresShell* shell = presContext->PresShell(); nsLineBox::DeleteLineList(presContext, mLines, aDestructRoot, &mFrames); if (HasPushedFloats()) { SafelyDestroyFrameListProp(aDestructRoot, shell, PushedFloatProperty()); RemoveStateBits(NS_BLOCK_HAS_PUSHED_FLOATS); } // destroy overflow lines now FrameLines* overflowLines = RemoveOverflowLines(); if (overflowLines) { nsLineBox::DeleteLineList(presContext, overflowLines->mLines, aDestructRoot, &overflowLines->mFrames); delete overflowLines; } if (GetStateBits() & NS_BLOCK_HAS_OVERFLOW_OUT_OF_FLOWS) { SafelyDestroyFrameListProp(aDestructRoot, shell, OverflowOutOfFlowsProperty()); RemoveStateBits(NS_BLOCK_HAS_OVERFLOW_OUT_OF_FLOWS); } if (HasOutsideBullet()) { SafelyDestroyFrameListProp(aDestructRoot, shell, OutsideBulletProperty()); RemoveStateBits(NS_BLOCK_FRAME_HAS_OUTSIDE_BULLET); } nsContainerFrame::DestroyFrom(aDestructRoot); } /* virtual */ nsILineIterator* nsBlockFrame::GetLineIterator() { nsLineIterator* it = new nsLineIterator; if (!it) return nullptr; const nsStyleVisibility* visibility = StyleVisibility(); nsresult rv = it->Init(mLines, visibility->mDirection == NS_STYLE_DIRECTION_RTL); if (NS_FAILED(rv)) { delete it; return nullptr; } return it; } NS_QUERYFRAME_HEAD(nsBlockFrame) NS_QUERYFRAME_ENTRY(nsBlockFrame) NS_QUERYFRAME_TAIL_INHERITING(nsContainerFrame) nsSplittableType nsBlockFrame::GetSplittableType() const { return NS_FRAME_SPLITTABLE_NON_RECTANGULAR; } #ifdef DEBUG_FRAME_DUMP void nsBlockFrame::List(FILE* out, const char* aPrefix, uint32_t aFlags) const { nsCString str; ListGeneric(str, aPrefix, aFlags); fprintf_stderr(out, "%s<\n", str.get()); nsCString pfx(aPrefix); pfx += " "; // Output the lines if (!mLines.empty()) { ConstLineIterator line = LinesBegin(), line_end = LinesEnd(); for ( ; line != line_end; ++line) { line->List(out, pfx.get(), aFlags); } } // Output the overflow lines. const FrameLines* overflowLines = GetOverflowLines(); if (overflowLines && !overflowLines->mLines.empty()) { fprintf_stderr(out, "%sOverflow-lines %p/%p <\n", pfx.get(), overflowLines, &overflowLines->mFrames); nsCString nestedPfx(pfx); nestedPfx += " "; ConstLineIterator line = overflowLines->mLines.begin(), line_end = overflowLines->mLines.end(); for ( ; line != line_end; ++line) { line->List(out, nestedPfx.get(), aFlags); } fprintf_stderr(out, "%s>\n", pfx.get()); } // skip the principal list - we printed the lines above // skip the overflow list - we printed the overflow lines above ChildListIterator lists(this); ChildListIDs skip(kPrincipalList | kOverflowList); for (; !lists.IsDone(); lists.Next()) { if (skip.Contains(lists.CurrentID())) { continue; } fprintf_stderr(out, "%s%s %p <\n", pfx.get(), mozilla::layout::ChildListName(lists.CurrentID()), &GetChildList(lists.CurrentID())); nsCString nestedPfx(pfx); nestedPfx += " "; nsFrameList::Enumerator childFrames(lists.CurrentList()); for (; !childFrames.AtEnd(); childFrames.Next()) { nsIFrame* kid = childFrames.get(); kid->List(out, nestedPfx.get(), aFlags); } fprintf_stderr(out, "%s>\n", pfx.get()); } fprintf_stderr(out, "%s>\n", aPrefix); } nsresult nsBlockFrame::GetFrameName(nsAString& aResult) const { return MakeFrameName(NS_LITERAL_STRING("Block"), aResult); } #endif #ifdef DEBUG nsFrameState nsBlockFrame::GetDebugStateBits() const { // We don't want to include our cursor flag in the bits the // regression tester looks at return nsContainerFrame::GetDebugStateBits() & ~NS_BLOCK_HAS_LINE_CURSOR; } #endif nsIAtom* nsBlockFrame::GetType() const { return nsGkAtoms::blockFrame; } void nsBlockFrame::InvalidateFrame(uint32_t aDisplayItemKey) { if (IsSVGText()) { NS_ASSERTION(GetParent()->GetType() == nsGkAtoms::svgTextFrame, "unexpected block frame in SVG text"); GetParent()->InvalidateFrame(); return; } nsContainerFrame::InvalidateFrame(aDisplayItemKey); } void nsBlockFrame::InvalidateFrameWithRect(const nsRect& aRect, uint32_t aDisplayItemKey) { if (IsSVGText()) { NS_ASSERTION(GetParent()->GetType() == nsGkAtoms::svgTextFrame, "unexpected block frame in SVG text"); GetParent()->InvalidateFrame(); return; } nsContainerFrame::InvalidateFrameWithRect(aRect, aDisplayItemKey); } nscoord nsBlockFrame::GetLogicalBaseline(WritingMode aWM) const { auto lastBaseline = BaselineBOffset(aWM, BaselineSharingGroup::eLast, AlignmentContext::eInline); return BSize(aWM) - lastBaseline; } bool nsBlockFrame::GetNaturalBaselineBOffset(mozilla::WritingMode aWM, BaselineSharingGroup aBaselineGroup, nscoord* aBaseline) const { if (aBaselineGroup == BaselineSharingGroup::eFirst) { return nsLayoutUtils::GetFirstLineBaseline(aWM, this, aBaseline); } for (ConstReverseLineIterator line = LinesRBegin(), line_end = LinesREnd(); line != line_end; ++line) { if (line->IsBlock()) { nscoord offset; nsIFrame* kid = line->mFirstChild; if (kid->GetVerticalAlignBaseline(aWM, &offset)) { // Ignore relative positioning for baseline calculations. const nsSize& sz = line->mContainerSize; offset += kid->GetLogicalNormalPosition(aWM, sz).B(aWM); *aBaseline = BSize(aWM) - offset; return true; } } else { // XXX Is this the right test? We have some bogus empty lines // floating around, but IsEmpty is perhaps too weak. if (line->BSize() != 0 || !line->IsEmpty()) { *aBaseline = BSize(aWM) - (line->BStart() + line->GetLogicalAscent()); return true; } } } return false; } nscoord nsBlockFrame::GetCaretBaseline() const { nsRect contentRect = GetContentRect(); nsMargin bp = GetUsedBorderAndPadding(); if (!mLines.empty()) { ConstLineIterator line = LinesBegin(); const nsLineBox* firstLine = line; if (firstLine->GetChildCount()) { return bp.top + firstLine->mFirstChild->GetCaretBaseline(); } } float inflation = nsLayoutUtils::FontSizeInflationFor(this); RefPtr fm = nsLayoutUtils::GetFontMetricsForFrame(this, inflation); nscoord lineHeight = ReflowInput::CalcLineHeight(GetContent(), StyleContext(), contentRect.height, inflation); const WritingMode wm = GetWritingMode(); return nsLayoutUtils::GetCenteredFontBaseline(fm, lineHeight, wm.IsLineInverted()) + bp.top; } ///////////////////////////////////////////////////////////////////////////// // Child frame enumeration const nsFrameList& nsBlockFrame::GetChildList(ChildListID aListID) const { switch (aListID) { case kPrincipalList: return mFrames; case kOverflowList: { FrameLines* overflowLines = GetOverflowLines(); return overflowLines ? overflowLines->mFrames : nsFrameList::EmptyList(); } case kFloatList: return mFloats; case kOverflowOutOfFlowList: { const nsFrameList* list = GetOverflowOutOfFlows(); return list ? *list : nsFrameList::EmptyList(); } case kPushedFloatsList: { const nsFrameList* list = GetPushedFloats(); return list ? *list : nsFrameList::EmptyList(); } case kBulletList: { const nsFrameList* list = GetOutsideBulletList(); return list ? *list : nsFrameList::EmptyList(); } default: return nsContainerFrame::GetChildList(aListID); } } void nsBlockFrame::GetChildLists(nsTArray* aLists) const { nsContainerFrame::GetChildLists(aLists); FrameLines* overflowLines = GetOverflowLines(); if (overflowLines) { overflowLines->mFrames.AppendIfNonempty(aLists, kOverflowList); } const nsFrameList* list = GetOverflowOutOfFlows(); if (list) { list->AppendIfNonempty(aLists, kOverflowOutOfFlowList); } mFloats.AppendIfNonempty(aLists, kFloatList); list = GetOutsideBulletList(); if (list) { list->AppendIfNonempty(aLists, kBulletList); } list = GetPushedFloats(); if (list) { list->AppendIfNonempty(aLists, kPushedFloatsList); } } /* virtual */ bool nsBlockFrame::IsFloatContainingBlock() const { return true; } static void ReparentFrame(nsIFrame* aFrame, nsContainerFrame* aOldParent, nsContainerFrame* aNewParent) { NS_ASSERTION(aOldParent == aFrame->GetParent(), "Parent not consistent with expectations"); aFrame->SetParent(aNewParent); // When pushing and pulling frames we need to check for whether any // views need to be reparented nsContainerFrame::ReparentFrameView(aFrame, aOldParent, aNewParent); } static void ReparentFrames(nsFrameList& aFrameList, nsContainerFrame* aOldParent, nsContainerFrame* aNewParent) { for (nsFrameList::Enumerator e(aFrameList); !e.AtEnd(); e.Next()) { ReparentFrame(e.get(), aOldParent, aNewParent); } } /** * Remove the first line from aFromLines and adjust the associated frame list * aFromFrames accordingly. The removed line is assigned to *aOutLine and * a frame list with its frames is assigned to *aOutFrames, i.e. the frames * that were extracted from the head of aFromFrames. * aFromLines must contain at least one line, the line may be empty. * @return true if aFromLines becomes empty */ static bool RemoveFirstLine(nsLineList& aFromLines, nsFrameList& aFromFrames, nsLineBox** aOutLine, nsFrameList* aOutFrames) { nsLineList_iterator removedLine = aFromLines.begin(); *aOutLine = removedLine; nsLineList_iterator next = aFromLines.erase(removedLine); bool isLastLine = next == aFromLines.end(); nsIFrame* lastFrame = isLastLine ? aFromFrames.LastChild() : next->mFirstChild->GetPrevSibling(); nsFrameList::FrameLinkEnumerator linkToBreak(aFromFrames, lastFrame); *aOutFrames = aFromFrames.ExtractHead(linkToBreak); return isLastLine; } ////////////////////////////////////////////////////////////////////// // Reflow methods /* virtual */ void nsBlockFrame::MarkIntrinsicISizesDirty() { nsBlockFrame* dirtyBlock = static_cast(FirstContinuation()); dirtyBlock->mMinWidth = NS_INTRINSIC_WIDTH_UNKNOWN; dirtyBlock->mPrefWidth = NS_INTRINSIC_WIDTH_UNKNOWN; if (!(GetStateBits() & NS_BLOCK_NEEDS_BIDI_RESOLUTION)) { for (nsIFrame* frame = dirtyBlock; frame; frame = frame->GetNextContinuation()) { frame->AddStateBits(NS_BLOCK_NEEDS_BIDI_RESOLUTION); } } nsContainerFrame::MarkIntrinsicISizesDirty(); } void nsBlockFrame::CheckIntrinsicCacheAgainstShrinkWrapState() { nsPresContext *presContext = PresContext(); if (!nsLayoutUtils::FontSizeInflationEnabled(presContext)) { return; } bool inflationEnabled = !presContext->mInflationDisabledForShrinkWrap; if (inflationEnabled != !!(GetStateBits() & NS_BLOCK_FRAME_INTRINSICS_INFLATED)) { mMinWidth = NS_INTRINSIC_WIDTH_UNKNOWN; mPrefWidth = NS_INTRINSIC_WIDTH_UNKNOWN; if (inflationEnabled) { AddStateBits(NS_BLOCK_FRAME_INTRINSICS_INFLATED); } else { RemoveStateBits(NS_BLOCK_FRAME_INTRINSICS_INFLATED); } } } /* virtual */ nscoord nsBlockFrame::GetMinISize(nsRenderingContext *aRenderingContext) { nsIFrame* firstInFlow = FirstContinuation(); if (firstInFlow != this) return firstInFlow->GetMinISize(aRenderingContext); DISPLAY_MIN_WIDTH(this, mMinWidth); CheckIntrinsicCacheAgainstShrinkWrapState(); if (mMinWidth != NS_INTRINSIC_WIDTH_UNKNOWN) return mMinWidth; #ifdef DEBUG if (gNoisyIntrinsic) { IndentBy(stdout, gNoiseIndent); ListTag(stdout); printf(": GetMinISize\n"); } AutoNoisyIndenter indenter(gNoisyIntrinsic); #endif for (nsBlockFrame* curFrame = this; curFrame; curFrame = static_cast(curFrame->GetNextContinuation())) { curFrame->LazyMarkLinesDirty(); } if (RenumberList()) { AddStateBits(NS_FRAME_HAS_DIRTY_CHILDREN); } if (GetStateBits() & NS_BLOCK_NEEDS_BIDI_RESOLUTION) ResolveBidi(); InlineMinISizeData data; for (nsBlockFrame* curFrame = this; curFrame; curFrame = static_cast(curFrame->GetNextContinuation())) { for (LineIterator line = curFrame->LinesBegin(), line_end = curFrame->LinesEnd(); line != line_end; ++line) { #ifdef DEBUG if (gNoisyIntrinsic) { IndentBy(stdout, gNoiseIndent); printf("line (%s%s)\n", line->IsBlock() ? "block" : "inline", line->IsEmpty() ? ", empty" : ""); } AutoNoisyIndenter lineindent(gNoisyIntrinsic); #endif if (line->IsBlock()) { data.ForceBreak(); data.mCurrentLine = nsLayoutUtils::IntrinsicForContainer(aRenderingContext, line->mFirstChild, nsLayoutUtils::MIN_ISIZE); data.ForceBreak(); } else { if (!curFrame->GetPrevContinuation() && line == curFrame->LinesBegin()) { // Only add text-indent if it has no percentages; using a // percentage basis of 0 unconditionally would give strange // behavior for calc(10%-3px). const nsStyleCoord &indent = StyleText()->mTextIndent; if (indent.ConvertsToLength()) data.mCurrentLine += nsRuleNode::ComputeCoordPercentCalc(indent, 0); } // XXX Bug NNNNNN Should probably handle percentage text-indent. data.mLine = &line; data.SetLineContainer(curFrame); nsIFrame *kid = line->mFirstChild; for (int32_t i = 0, i_end = line->GetChildCount(); i != i_end; ++i, kid = kid->GetNextSibling()) { kid->AddInlineMinISize(aRenderingContext, &data); } } #ifdef DEBUG if (gNoisyIntrinsic) { IndentBy(stdout, gNoiseIndent); printf("min: [prevLines=%d currentLine=%d]\n", data.mPrevLines, data.mCurrentLine); } #endif } } data.ForceBreak(); mMinWidth = data.mPrevLines; return mMinWidth; } /* virtual */ nscoord nsBlockFrame::GetPrefISize(nsRenderingContext *aRenderingContext) { nsIFrame* firstInFlow = FirstContinuation(); if (firstInFlow != this) return firstInFlow->GetPrefISize(aRenderingContext); DISPLAY_PREF_WIDTH(this, mPrefWidth); CheckIntrinsicCacheAgainstShrinkWrapState(); if (mPrefWidth != NS_INTRINSIC_WIDTH_UNKNOWN) return mPrefWidth; #ifdef DEBUG if (gNoisyIntrinsic) { IndentBy(stdout, gNoiseIndent); ListTag(stdout); printf(": GetPrefISize\n"); } AutoNoisyIndenter indenter(gNoisyIntrinsic); #endif for (nsBlockFrame* curFrame = this; curFrame; curFrame = static_cast(curFrame->GetNextContinuation())) { curFrame->LazyMarkLinesDirty(); } if (RenumberList()) { AddStateBits(NS_FRAME_HAS_DIRTY_CHILDREN); } if (GetStateBits() & NS_BLOCK_NEEDS_BIDI_RESOLUTION) ResolveBidi(); InlinePrefISizeData data; for (nsBlockFrame* curFrame = this; curFrame; curFrame = static_cast(curFrame->GetNextContinuation())) { for (LineIterator line = curFrame->LinesBegin(), line_end = curFrame->LinesEnd(); line != line_end; ++line) { #ifdef DEBUG if (gNoisyIntrinsic) { IndentBy(stdout, gNoiseIndent); printf("line (%s%s)\n", line->IsBlock() ? "block" : "inline", line->IsEmpty() ? ", empty" : ""); } AutoNoisyIndenter lineindent(gNoisyIntrinsic); #endif if (line->IsBlock()) { data.ForceBreak(); data.mCurrentLine = nsLayoutUtils::IntrinsicForContainer(aRenderingContext, line->mFirstChild, nsLayoutUtils::PREF_ISIZE); data.ForceBreak(); } else { if (!curFrame->GetPrevContinuation() && line == curFrame->LinesBegin()) { // Only add text-indent if it has no percentages; using a // percentage basis of 0 unconditionally would give strange // behavior for calc(10%-3px). const nsStyleCoord &indent = StyleText()->mTextIndent; if (indent.ConvertsToLength()) data.mCurrentLine += nsRuleNode::ComputeCoordPercentCalc(indent, 0); } // XXX Bug NNNNNN Should probably handle percentage text-indent. data.mLine = &line; data.SetLineContainer(curFrame); nsIFrame *kid = line->mFirstChild; for (int32_t i = 0, i_end = line->GetChildCount(); i != i_end; ++i, kid = kid->GetNextSibling()) { kid->AddInlinePrefISize(aRenderingContext, &data); } } #ifdef DEBUG if (gNoisyIntrinsic) { IndentBy(stdout, gNoiseIndent); printf("pref: [prevLines=%d currentLine=%d]\n", data.mPrevLines, data.mCurrentLine); } #endif } } data.ForceBreak(); mPrefWidth = data.mPrevLines; return mPrefWidth; } nsRect nsBlockFrame::ComputeTightBounds(DrawTarget* aDrawTarget) const { // be conservative if (StyleContext()->HasTextDecorationLines()) { return GetVisualOverflowRect(); } return ComputeSimpleTightBounds(aDrawTarget); } /* virtual */ nsresult nsBlockFrame::GetPrefWidthTightBounds(nsRenderingContext* aRenderingContext, nscoord* aX, nscoord* aXMost) { nsIFrame* firstInFlow = FirstContinuation(); if (firstInFlow != this) { return firstInFlow->GetPrefWidthTightBounds(aRenderingContext, aX, aXMost); } *aX = 0; *aXMost = 0; nsresult rv; InlinePrefISizeData data; for (nsBlockFrame* curFrame = this; curFrame; curFrame = static_cast(curFrame->GetNextContinuation())) { for (LineIterator line = curFrame->LinesBegin(), line_end = curFrame->LinesEnd(); line != line_end; ++line) { nscoord childX, childXMost; if (line->IsBlock()) { data.ForceBreak(); rv = line->mFirstChild->GetPrefWidthTightBounds(aRenderingContext, &childX, &childXMost); NS_ENSURE_SUCCESS(rv, rv); *aX = std::min(*aX, childX); *aXMost = std::max(*aXMost, childXMost); } else { if (!curFrame->GetPrevContinuation() && line == curFrame->LinesBegin()) { // Only add text-indent if it has no percentages; using a // percentage basis of 0 unconditionally would give strange // behavior for calc(10%-3px). const nsStyleCoord &indent = StyleText()->mTextIndent; if (indent.ConvertsToLength()) { data.mCurrentLine += nsRuleNode::ComputeCoordPercentCalc(indent, 0); } } // XXX Bug NNNNNN Should probably handle percentage text-indent. data.mLine = &line; data.SetLineContainer(curFrame); nsIFrame *kid = line->mFirstChild; for (int32_t i = 0, i_end = line->GetChildCount(); i != i_end; ++i, kid = kid->GetNextSibling()) { rv = kid->GetPrefWidthTightBounds(aRenderingContext, &childX, &childXMost); NS_ENSURE_SUCCESS(rv, rv); *aX = std::min(*aX, data.mCurrentLine + childX); *aXMost = std::max(*aXMost, data.mCurrentLine + childXMost); kid->AddInlinePrefISize(aRenderingContext, &data); } } } } data.ForceBreak(); return NS_OK; } /** * Return whether aNewAvailableSpace is smaller *on either side* * (inline-start or inline-end) than aOldAvailableSpace, so that we know * if we need to redo layout on an line, replaced block, or block * formatting context, because its height (which we used to compute * aNewAvailableSpace) caused it to intersect additional floats. */ static bool AvailableSpaceShrunk(WritingMode aWM, const LogicalRect& aOldAvailableSpace, const LogicalRect& aNewAvailableSpace, bool aCanGrow /* debug-only */) { if (aNewAvailableSpace.ISize(aWM) == 0) { // Positions are not significant if the inline size is zero. return aOldAvailableSpace.ISize(aWM) != 0; } if (aCanGrow) { NS_ASSERTION(aNewAvailableSpace.IStart(aWM) <= aOldAvailableSpace.IStart(aWM) || aNewAvailableSpace.IEnd(aWM) <= aOldAvailableSpace.IEnd(aWM), "available space should not shrink on the start side and " "grow on the end side"); NS_ASSERTION(aNewAvailableSpace.IStart(aWM) >= aOldAvailableSpace.IStart(aWM) || aNewAvailableSpace.IEnd(aWM) >= aOldAvailableSpace.IEnd(aWM), "available space should not grow on the start side and " "shrink on the end side"); } else { NS_ASSERTION(aOldAvailableSpace.IStart(aWM) <= aNewAvailableSpace.IStart(aWM) && aOldAvailableSpace.IEnd(aWM) >= aNewAvailableSpace.IEnd(aWM), "available space should never grow"); } // Have we shrunk on either side? return aNewAvailableSpace.IStart(aWM) > aOldAvailableSpace.IStart(aWM) || aNewAvailableSpace.IEnd(aWM) < aOldAvailableSpace.IEnd(aWM); } static LogicalSize CalculateContainingBlockSizeForAbsolutes(WritingMode aWM, const ReflowInput& aReflowInput, LogicalSize aFrameSize) { // The issue here is that for a 'height' of 'auto' the reflow state // code won't know how to calculate the containing block height // because it's calculated bottom up. So we use our own computed // size as the dimensions. nsIFrame* frame = aReflowInput.mFrame; LogicalSize cbSize(aFrameSize); // Containing block is relative to the padding edge const LogicalMargin& border = LogicalMargin(aWM, aReflowInput.ComputedPhysicalBorderPadding() - aReflowInput.ComputedPhysicalPadding()); cbSize.ISize(aWM) -= border.IStartEnd(aWM); cbSize.BSize(aWM) -= border.BStartEnd(aWM); if (frame->GetParent()->GetContent() == frame->GetContent() && frame->GetParent()->GetType() != nsGkAtoms::canvasFrame) { // We are a wrapped frame for the content (and the wrapper is not the // canvas frame, whose size is not meaningful here). // Use the container's dimensions, if they have been precomputed. // XXX This is a hack! We really should be waiting until the outermost // frame is fully reflowed and using the resulting dimensions, even // if they're intrinsic. // In fact we should be attaching absolute children to the outermost // frame and not always sticking them in block frames. // First, find the reflow state for the outermost frame for this // content, except for fieldsets where the inner anonymous frame has // the correct padding area with the legend taken into account. const ReflowInput* aLastRI = &aReflowInput; const ReflowInput* lastButOneRI = &aReflowInput; while (aLastRI->mParentReflowInput && aLastRI->mParentReflowInput->mFrame->GetContent() == frame->GetContent() && aLastRI->mParentReflowInput->mFrame->GetType() != nsGkAtoms::fieldSetFrame) { lastButOneRI = aLastRI; aLastRI = aLastRI->mParentReflowInput; } if (aLastRI != &aReflowInput) { // Scrollbars need to be specifically excluded, if present, because they are outside the // padding-edge. We need better APIs for getting the various boxes from a frame. nsIScrollableFrame* scrollFrame = do_QueryFrame(aLastRI->mFrame); nsMargin scrollbars(0,0,0,0); if (scrollFrame) { scrollbars = scrollFrame->GetDesiredScrollbarSizes(aLastRI->mFrame->PresContext(), aLastRI->mRenderingContext); if (!lastButOneRI->mFlags.mAssumingHScrollbar) { scrollbars.top = scrollbars.bottom = 0; } if (!lastButOneRI->mFlags.mAssumingVScrollbar) { scrollbars.left = scrollbars.right = 0; } } // We found a reflow state for the outermost wrapping frame, so use // its computed metrics if available, converted to our writing mode WritingMode lastWM = aLastRI->GetWritingMode(); LogicalSize lastRISize = LogicalSize(lastWM, aLastRI->ComputedISize(), aLastRI->ComputedBSize()).ConvertTo(aWM, lastWM); LogicalMargin lastRIPadding = aLastRI->ComputedLogicalPadding().ConvertTo(aWM, lastWM); LogicalMargin logicalScrollbars(aWM, scrollbars); if (lastRISize.ISize(aWM) != NS_UNCONSTRAINEDSIZE) { cbSize.ISize(aWM) = std::max(0, lastRISize.ISize(aWM) + lastRIPadding.IStartEnd(aWM) - logicalScrollbars.IStartEnd(aWM)); } if (lastRISize.BSize(aWM) != NS_UNCONSTRAINEDSIZE) { cbSize.BSize(aWM) = std::max(0, lastRISize.BSize(aWM) + lastRIPadding.BStartEnd(aWM) - logicalScrollbars.BStartEnd(aWM)); } } } return cbSize; } void nsBlockFrame::Reflow(nsPresContext* aPresContext, ReflowOutput& aMetrics, const ReflowInput& aReflowInput, nsReflowStatus& aStatus) { MarkInReflow(); DO_GLOBAL_REFLOW_COUNT("nsBlockFrame"); DISPLAY_REFLOW(aPresContext, this, aReflowInput, aMetrics, aStatus); #ifdef DEBUG if (gNoisyReflow) { IndentBy(stdout, gNoiseIndent); ListTag(stdout); printf(": begin reflow availSize=%d,%d computedSize=%d,%d\n", aReflowInput.AvailableISize(), aReflowInput.AvailableBSize(), aReflowInput.ComputedISize(), aReflowInput.ComputedBSize()); } AutoNoisyIndenter indent(gNoisy); PRTime start = 0; // Initialize these variablies to silence the compiler. int32_t ctc = 0; // We only use these if they are set (gLameReflowMetrics). if (gLameReflowMetrics) { start = PR_Now(); ctc = nsLineBox::GetCtorCount(); } #endif const ReflowInput *reflowInput = &aReflowInput; WritingMode wm = aReflowInput.GetWritingMode(); nscoord consumedBSize = GetConsumedBSize(); nscoord effectiveComputedBSize = GetEffectiveComputedBSize(aReflowInput, consumedBSize); Maybe mutableReflowInput; // If we have non-auto block size, we're clipping our kids and we fit, // make sure our kids fit too. if (aReflowInput.AvailableBSize() != NS_UNCONSTRAINEDSIZE && aReflowInput.ComputedBSize() != NS_AUTOHEIGHT && ShouldApplyOverflowClipping(this, aReflowInput.mStyleDisplay)) { LogicalMargin blockDirExtras = aReflowInput.ComputedLogicalBorderPadding(); if (GetLogicalSkipSides().BStart()) { blockDirExtras.BStart(wm) = 0; } else { // Block-end margin never causes us to create continuations, so we // don't need to worry about whether it fits in its entirety. blockDirExtras.BStart(wm) += aReflowInput.ComputedLogicalMargin().BStart(wm); } if (effectiveComputedBSize + blockDirExtras.BStartEnd(wm) <= aReflowInput.AvailableBSize()) { mutableReflowInput.emplace(aReflowInput); mutableReflowInput->AvailableBSize() = NS_UNCONSTRAINEDSIZE; reflowInput = mutableReflowInput.ptr(); } } // 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(*reflowInput)); // 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(*reflowInput, aMetrics, aStatus)) { return; } #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); #endif // 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(); bool blockStartMarginRoot, blockEndMarginRoot; IsMarginRoot(&blockStartMarginRoot, &blockEndMarginRoot); // Cache the consumed height in the block reflow state so that we don't have // to continually recompute it. BlockReflowInput state(*reflowInput, aPresContext, this, blockStartMarginRoot, blockEndMarginRoot, needFloatManager, consumedBSize); if (GetStateBits() & NS_BLOCK_NEEDS_BIDI_RESOLUTION) static_cast(FirstContinuation())->ResolveBidi(); if (RenumberList()) { AddStateBits(NS_FRAME_HAS_DIRTY_CHILDREN); } // Handle paginated overflow (see nsContainerFrame.h) nsOverflowAreas ocBounds; nsReflowStatus ocStatus = NS_FRAME_COMPLETE; if (GetPrevInFlow()) { ReflowOverflowContainerChildren(aPresContext, *reflowInput, ocBounds, 0, ocStatus); } // Now that we're done cleaning up our overflow container lists, we can // give |state| its nsOverflowContinuationTracker. nsOverflowContinuationTracker tracker(this, false); state.mOverflowTracker = &tracker; // Drain & handle pushed floats DrainPushedFloats(); nsOverflowAreas fcBounds; nsReflowStatus fcStatus = NS_FRAME_COMPLETE; ReflowPushedFloats(state, fcBounds, fcStatus); // If we're not dirty (which means we'll mark everything dirty later) // and our inline-size has changed, mark the lines dirty that we need to // mark dirty for a resize reflow. if (!(GetStateBits() & NS_FRAME_IS_DIRTY) && reflowInput->IsIResize()) { PrepareResizeReflow(state); } // The same for percentage text-indent, except conditioned on the // parent resizing. if (!(GetStateBits() & NS_FRAME_IS_DIRTY) && reflowInput->mCBReflowInput && reflowInput->mCBReflowInput->IsIResize() && reflowInput->mStyleText->mTextIndent.HasPercent() && !mLines.empty()) { mLines.front()->MarkDirty(); } LazyMarkLinesDirty(); mState &= ~NS_FRAME_FIRST_REFLOW; // Now reflow... ReflowDirtyLines(state); // If we have a next-in-flow, and that next-in-flow has pushed floats from // this frame from a previous iteration of reflow, then we should not return // a status of NS_FRAME_IS_FULLY_COMPLETE, since we actually have overflow, // it's just already been handled. // NOTE: This really shouldn't happen, since we _should_ pull back our floats // and reflow them, but just in case it does, this is a safety precaution so // we don't end up with a placeholder pointing to frames that have already // been deleted as part of removing our next-in-flow. // XXXmats maybe this code isn't needed anymore? // XXXmats (layout/generic/crashtests/600100.xhtml doesn't crash without it) if (NS_FRAME_IS_FULLY_COMPLETE(state.mReflowStatus)) { nsBlockFrame* nif = static_cast(GetNextInFlow()); while (nif) { if (nif->HasPushedFloatsFromPrevContinuation()) { bool oc = nif->GetStateBits() & NS_FRAME_IS_OVERFLOW_CONTAINER; NS_MergeReflowStatusInto(&state.mReflowStatus, oc ? NS_FRAME_OVERFLOW_INCOMPLETE : NS_FRAME_NOT_COMPLETE); break; } nif = static_cast(nif->GetNextInFlow()); } } 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 != reflowInput->AvailableBSize() && 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 (HasOverflowLines() || HasPushedFloats()) { state.mReflowStatus |= NS_FRAME_REFLOW_NEXTINFLOW; } #ifdef DEBUG_kipp ListTag(stdout); printf(": block is not fully complete\n"); #endif } // 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:
  • \n

    ... ). This is where // the second case can happen. if (HasOutsideBullet() && !mLines.empty() && (mLines.front()->IsBlock() || (0 == mLines.front()->BSize() && mLines.front() != mLines.back() && mLines.begin().next()->IsBlock()))) { // Reflow the bullet ReflowOutput reflowOutput(aReflowInput); // XXX Use the entire line when we fix bug 25888. nsLayoutUtils::LinePosition position; WritingMode wm = aReflowInput.GetWritingMode(); bool havePosition = nsLayoutUtils::GetFirstLinePosition(wm, this, &position); nscoord lineBStart = havePosition ? position.mBStart : reflowInput->ComputedLogicalBorderPadding().BStart(wm); nsIFrame* bullet = GetOutsideBullet(); ReflowBullet(bullet, state, reflowOutput, lineBStart); NS_ASSERTION(!BulletIsEmpty() || reflowOutput.BSize(wm) == 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... LogicalRect bbox = bullet->GetLogicalRect(wm, reflowOutput.PhysicalSize()); bbox.BStart(wm) = position.mBaseline - reflowOutput.BlockStartAscent(); bullet->SetRect(wm, bbox, reflowOutput.PhysicalSize()); } // Otherwise just leave the bullet where it is, up against our // block-start padding. } CheckFloats(state); // Compute our final size nscoord blockEndEdgeOfChildren; ComputeFinalSize(*reflowInput, state, aMetrics, &blockEndEdgeOfChildren); // If the block direction is right-to-left, we need to update the bounds of // lines that were placed relative to mContainerSize during reflow, as // we typically do not know the true container size until we've reflowed all // its children. So we use a dummy mContainerSize during reflow (see // BlockReflowInput's constructor) and then fix up the positions of the // lines here, once the final block size is known. // // Note that writing-mode:vertical-rl is the only case where the block // logical direction progresses in a negative physical direction, and // therefore block-dir coordinate conversion depends on knowing the width // of the coordinate space in order to translate between the logical and // physical origins. if (wm.IsVerticalRL()) { nsSize containerSize = aMetrics.PhysicalSize(); nscoord deltaX = containerSize.width - state.ContainerSize().width; if (deltaX != 0) { for (LineIterator line = LinesBegin(), end = LinesEnd(); line != end; line++) { UpdateLineContainerSize(line, containerSize); } for (nsIFrame* f : mFloats) { nsPoint physicalDelta(deltaX, 0); f->MovePositionBy(physicalDelta); } nsFrameList* bulletList = GetOutsideBulletList(); if (bulletList) { nsPoint physicalDelta(deltaX, 0); for (nsIFrame* f : *bulletList) { f->MovePositionBy(physicalDelta); } } } } nsRect areaBounds = nsRect(0, 0, aMetrics.Width(), aMetrics.Height()); ComputeOverflowAreas(areaBounds, reflowInput->mStyleDisplay, blockEndEdgeOfChildren, 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. WritingMode parentWM = aMetrics.GetWritingMode(); if (HasAbsolutelyPositionedChildren()) { nsAbsoluteContainingBlock* absoluteContainer = GetAbsoluteContainingBlock(); bool haveInterrupt = aPresContext->HasPendingInterrupt(); if (reflowInput->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 { LogicalSize containingBlockSize = CalculateContainingBlockSizeForAbsolutes(parentWM, *reflowInput, aMetrics.Size(parentWM)); // 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. // XXX "width" and "height" in this block will become ISize and BSize // when nsAbsoluteContainingBlock is logicalized 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 == reflowInput->ComputedHeight()) && aMetrics.Height() != oldSize.height; nsRect containingBlock(nsPoint(0, 0), containingBlockSize.GetPhysicalSize(parentWM)); AbsPosReflowFlags flags = AbsPosReflowFlags::eConstrainHeight; if (cbWidthChanged) { flags |= AbsPosReflowFlags::eCBWidthChanged; } if (cbHeightChanged) { flags |= AbsPosReflowFlags::eCBHeightChanged; } // Setup the line cursor here to optimize line searching for // calculating hypothetical position of absolutely-positioned // frames. The line cursor is immediately cleared afterward to // avoid affecting the display list generation. AutoLineCursorSetup autoLineCursor(this); absoluteContainer->Reflow(this, aPresContext, *reflowInput, state.mReflowStatus, containingBlock, flags, &aMetrics.mOverflowAreas); } } 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 = nullptr; 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.ISize(parentWM), aMetrics.BSize(parentWM), aMetrics.mCarriedOutBEndMargin.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(); int32_t ectc = nsLineBox::GetCtorCount(); int32_t numLines = mLines.size(); if (!numLines) numLines = 1; PRTime delta, perLineDelta, lines; lines = int64_t(numLines); delta = end - start; perLineDelta = delta / lines; ListTag(stdout); char buf[400]; SprintfLiteral(buf, ": %" PRId64 " elapsed (%" PRId64 " per line) (%d lines; %d new lines)", delta, perLineDelta, numLines, ectc - ctc); printf("%s\n", buf); } #endif NS_FRAME_SET_TRUNCATION(aStatus, (*reflowInput), aMetrics); } bool nsBlockFrame::CheckForCollapsedBEndMarginFromClearanceLine() { LineIterator begin = LinesBegin(); LineIterator line = LinesEnd(); while (true) { if (begin == line) { return false; } --line; if (line->BSize() != 0 || !line->CachedIsEmpty()) { return false; } if (line->HasClearance()) { return true; } } // not reached } void nsBlockFrame::ComputeFinalSize(const ReflowInput& aReflowInput, BlockReflowInput& aState, ReflowOutput& aMetrics, nscoord* aBEndEdgeOfChildren) { WritingMode wm = aState.mReflowInput.GetWritingMode(); const LogicalMargin& borderPadding = aState.BorderPadding(); #ifdef NOISY_FINAL_SIZE ListTag(stdout); printf(": mBCoord=%d mIsBEndMarginRoot=%s mPrevBEndMargin=%d bp=%d,%d\n", aState.mBCoord, aState.mFlags.mIsBEndMarginRoot ? "yes" : "no", aState.mPrevBEndMargin.get(), borderPadding.BStart(wm), borderPadding.BEnd(wm)); #endif // Compute final inline size LogicalSize finalSize(wm); finalSize.ISize(wm) = NSCoordSaturatingAdd(NSCoordSaturatingAdd(borderPadding.IStart(wm), aReflowInput.ComputedISize()), borderPadding.IEnd(wm)); // Return block-end margin information // rbs says he hit this assertion occasionally (see bug 86947), so // just set the margin to zero and we'll figure out why later //NS_ASSERTION(aMetrics.mCarriedOutBEndMargin.IsZero(), // "someone else set the margin"); nscoord nonCarriedOutBDirMargin = 0; if (!aState.mFlags.mIsBEndMarginRoot) { // Apply rule from CSS 2.1 section 8.3.1. If we have some empty // line with clearance and a non-zero block-start margin and all // subsequent lines are empty, then we do not allow our children's // carried out block-end margin to be carried out of us and collapse // with our own block-end margin. if (CheckForCollapsedBEndMarginFromClearanceLine()) { // Convert the children's carried out margin to something that // we will include in our height nonCarriedOutBDirMargin = aState.mPrevBEndMargin.get(); aState.mPrevBEndMargin.Zero(); } aMetrics.mCarriedOutBEndMargin = aState.mPrevBEndMargin; } else { aMetrics.mCarriedOutBEndMargin.Zero(); } nscoord blockEndEdgeOfChildren = aState.mBCoord + nonCarriedOutBDirMargin; // Shrink wrap our height around our contents. if (aState.mFlags.mIsBEndMarginRoot || NS_UNCONSTRAINEDSIZE != aReflowInput.ComputedBSize()) { // When we are a block-end-margin root make sure that our last // childs block-end margin is fully applied. We also do this when // we have a computed height, since in that case the carried out // margin is not going to be applied anywhere, so we should note it // here to be included in the overflow area. // Apply the margin only if there's space for it. if (blockEndEdgeOfChildren < aState.mReflowInput.AvailableBSize()) { // Truncate block-end margin if it doesn't fit to our available BSize. blockEndEdgeOfChildren = std::min(blockEndEdgeOfChildren + aState.mPrevBEndMargin.get(), aState.mReflowInput.AvailableBSize()); } } if (aState.mFlags.mBlockNeedsFloatManager) { // Include the float manager's state to properly account for the // block-end margin of any floated elements; e.g., inside a table cell. nscoord floatHeight = aState.ClearFloats(blockEndEdgeOfChildren, StyleClear::Both, nullptr, nsFloatManager::DONT_CLEAR_PUSHED_FLOATS); blockEndEdgeOfChildren = std::max(blockEndEdgeOfChildren, floatHeight); } if (NS_UNCONSTRAINEDSIZE != aReflowInput.ComputedBSize() && (GetParent()->GetType() != nsGkAtoms::columnSetFrame || aReflowInput.mParentReflowInput->AvailableBSize() == NS_UNCONSTRAINEDSIZE)) { ComputeFinalBSize(aReflowInput, &aState.mReflowStatus, aState.mBCoord + nonCarriedOutBDirMargin, borderPadding, finalSize, aState.mConsumedBSize); if (!NS_FRAME_IS_COMPLETE(aState.mReflowStatus)) { // Use the current height; continuations will take up the rest. // Do extend the height to at least consume the available // height, otherwise our left/right borders (for example) won't // extend all the way to the break. finalSize.BSize(wm) = std::max(aReflowInput.AvailableBSize(), aState.mBCoord + nonCarriedOutBDirMargin); // ... but don't take up more block size than is available nscoord effectiveComputedBSize = GetEffectiveComputedBSize(aReflowInput, aState.GetConsumedBSize()); finalSize.BSize(wm) = std::min(finalSize.BSize(wm), borderPadding.BStart(wm) + effectiveComputedBSize); // XXX It's pretty wrong that our bottom border still gets drawn on // on its own on the last-in-flow, even if we ran out of height // here. We need GetSkipSides to check whether we ran out of content // height in the current frame, not whether it's last-in-flow. } // Don't carry out a block-end margin when our BSize is fixed. aMetrics.mCarriedOutBEndMargin.Zero(); } else if (NS_FRAME_IS_COMPLETE(aState.mReflowStatus)) { nscoord contentBSize = blockEndEdgeOfChildren - borderPadding.BStart(wm); nscoord autoBSize = aReflowInput.ApplyMinMaxBSize(contentBSize); if (autoBSize != contentBSize) { // Our min- or max-bsize value made our bsize change. Don't carry out // our kids' block-end margins. aMetrics.mCarriedOutBEndMargin.Zero(); } autoBSize += borderPadding.BStart(wm) + borderPadding.BEnd(wm); finalSize.BSize(wm) = autoBSize; } else { NS_ASSERTION(aReflowInput.AvailableBSize() != NS_UNCONSTRAINEDSIZE, "Shouldn't be incomplete if availableBSize is UNCONSTRAINED."); finalSize.BSize(wm) = std::max(aState.mBCoord, aReflowInput.AvailableBSize()); if (aReflowInput.AvailableBSize() == NS_UNCONSTRAINEDSIZE) { // This should never happen, but it does. See bug 414255 finalSize.BSize(wm) = aState.mBCoord; } } if (IS_TRUE_OVERFLOW_CONTAINER(this)) { if (NS_FRAME_IS_NOT_COMPLETE(aState.mReflowStatus)) { // Overflow containers can only be overflow complete. // Note that auto height overflow containers have no normal children NS_ASSERTION(finalSize.BSize(wm) == 0, "overflow containers must be zero-block-size"); NS_FRAME_SET_OVERFLOW_INCOMPLETE(aState.mReflowStatus); } } else if (aReflowInput.AvailableBSize() != NS_UNCONSTRAINEDSIZE && !NS_INLINE_IS_BREAK_BEFORE(aState.mReflowStatus) && NS_FRAME_IS_COMPLETE(aState.mReflowStatus)) { // Currently only used for grid items, but could be used in other contexts. // The FragStretchBSizeProperty is our expected non-fragmented block-size // we should stretch to (for align-self:stretch etc). In some fragmentation // cases though, the last fragment (this frame since we're complete), needs // to have extra size applied because earlier fragments consumed too much of // our computed size due to overflowing their containing block. (E.g. this // ensures we fill the last row when a multi-row grid item is fragmented). bool found; nscoord bSize = GetProperty(FragStretchBSizeProperty(), &found); if (found) { finalSize.BSize(wm) = std::max(bSize, finalSize.BSize(wm)); } } // Clamp the content size to fit within the margin-box clamp size, if any. if (MOZ_UNLIKELY(aReflowInput.mFlags.mBClampMarginBoxMinSize) && NS_FRAME_IS_COMPLETE(aState.mReflowStatus)) { bool found; nscoord cbSize = GetProperty(BClampMarginBoxMinSizeProperty(), &found); if (found) { auto marginBoxBSize = finalSize.BSize(wm) + aReflowInput.ComputedLogicalMargin().BStartEnd(wm); auto overflow = marginBoxBSize - cbSize; if (overflow > 0) { auto contentBSize = finalSize.BSize(wm) - borderPadding.BStartEnd(wm); auto newContentBSize = std::max(nscoord(0), contentBSize - overflow); // XXXmats deal with percentages better somehow? finalSize.BSize(wm) -= contentBSize - newContentBSize; } } } // Screen out negative block sizes --- can happen due to integer overflows :-( finalSize.BSize(wm) = std::max(0, finalSize.BSize(wm)); *aBEndEdgeOfChildren = blockEndEdgeOfChildren; if (blockEndEdgeOfChildren != finalSize.BSize(wm) - borderPadding.BEnd(wm)) { SetProperty(BlockEndEdgeOfChildrenProperty(), blockEndEdgeOfChildren); } else { DeleteProperty(BlockEndEdgeOfChildrenProperty()); } aMetrics.SetSize(wm, finalSize); #ifdef DEBUG_blocks if ((CRAZY_SIZE(aMetrics.Width()) || CRAZY_SIZE(aMetrics.Height())) && !GetParent()->IsCrazySizeAssertSuppressed()) { ListTag(stdout); printf(": WARNING: desired:%d,%d\n", aMetrics.Width(), aMetrics.Height()); } #endif } static void ConsiderBlockEndEdgeOfChildren(const WritingMode aWritingMode, nscoord aBEndEdgeOfChildren, nsOverflowAreas& aOverflowAreas) { // Factor in the block-end edge of the children. Child frames will be added // to the overflow area as we iterate through the lines, but their margins // won't, so we need to account for block-end margins here. // REVIEW: For now, we do this for both visual and scrollable area, // although when we make scrollable overflow area not be a subset of // visual, we can change this. // XXX Currently, overflow areas are stored as physical rects, so we have // to handle writing modes explicitly here. If we change overflow rects // to be stored logically, this can be simplified again. if (aWritingMode.IsVertical()) { if (aWritingMode.IsVerticalLR()) { NS_FOR_FRAME_OVERFLOW_TYPES(otype) { nsRect& o = aOverflowAreas.Overflow(otype); o.width = std::max(o.XMost(), aBEndEdgeOfChildren) - o.x; } } else { NS_FOR_FRAME_OVERFLOW_TYPES(otype) { nsRect& o = aOverflowAreas.Overflow(otype); nscoord xmost = o.XMost(); o.x = std::min(o.x, xmost - aBEndEdgeOfChildren); o.width = xmost - o.x; } } } else { NS_FOR_FRAME_OVERFLOW_TYPES(otype) { nsRect& o = aOverflowAreas.Overflow(otype); o.height = std::max(o.YMost(), aBEndEdgeOfChildren) - o.y; } } } void nsBlockFrame::ComputeOverflowAreas(const nsRect& aBounds, const nsStyleDisplay* aDisplay, nscoord aBEndEdgeOfChildren, nsOverflowAreas& aOverflowAreas) { // Compute the overflow areas of our children // XXX_perf: This can be done incrementally. It is currently one of // the things that makes incremental reflow O(N^2). nsOverflowAreas areas(aBounds, aBounds); if (!ShouldApplyOverflowClipping(this, aDisplay)) { for (LineIterator line = LinesBegin(), line_end = LinesEnd(); line != line_end; ++line) { areas.UnionWith(line->GetOverflowAreas()); } // Factor an outside bullet in; normally the bullet will be factored into // the line-box's overflow areas. However, if the line is a block // line then it won't; if there are no lines, it won't. So just // factor it in anyway (it can't hurt if it was already done). // XXXldb Can we just fix GetOverflowArea instead? nsIFrame* outsideBullet = GetOutsideBullet(); if (outsideBullet) { areas.UnionAllWith(outsideBullet->GetRect()); } ConsiderBlockEndEdgeOfChildren(GetWritingMode(), aBEndEdgeOfChildren, areas); } #ifdef NOISY_COMBINED_AREA ListTag(stdout); const nsRect& vis = areas.VisualOverflow(); printf(": VisualOverflowArea CA=%d,%d,%d,%d\n", vis.x, vis.y, vis.width, vis.height); const nsRect& scr = areas.ScrollableOverflow(); printf(": ScrollableOverflowArea CA=%d,%d,%d,%d\n", scr.x, scr.y, scr.width, scr.height); #endif aOverflowAreas = areas; } void nsBlockFrame::UnionChildOverflow(nsOverflowAreas& aOverflowAreas) { // We need to update the overflow areas of lines manually, as they // get cached and re-used otherwise. Lines aren't exposed as normal // frame children, so calling UnionChildOverflow alone will end up // using the old cached values. for (LineIterator line = LinesBegin(), line_end = LinesEnd(); line != line_end; ++line) { nsRect bounds = line->GetPhysicalBounds(); nsOverflowAreas lineAreas(bounds, bounds); int32_t n = line->GetChildCount(); for (nsIFrame* lineFrame = line->mFirstChild; n > 0; lineFrame = lineFrame->GetNextSibling(), --n) { ConsiderChildOverflow(lineAreas, lineFrame); } // Consider the overflow areas of the floats attached to the line as well if (line->HasFloats()) { for (nsFloatCache* fc = line->GetFirstFloat(); fc; fc = fc->Next()) { ConsiderChildOverflow(lineAreas, fc->mFloat); } } line->SetOverflowAreas(lineAreas); aOverflowAreas.UnionWith(lineAreas); } // Union with child frames, skipping the principal and float lists // since we already handled those using the line boxes. nsLayoutUtils::UnionChildOverflow(this, aOverflowAreas, kPrincipalList | kFloatList); } bool nsBlockFrame::ComputeCustomOverflow(nsOverflowAreas& aOverflowAreas) { bool found; nscoord blockEndEdgeOfChildren = GetProperty(BlockEndEdgeOfChildrenProperty(), &found); if (found) { ConsiderBlockEndEdgeOfChildren(GetWritingMode(), blockEndEdgeOfChildren, aOverflowAreas); } // Line cursor invariants depend on the overflow areas of the lines, so // we must clear the line cursor since those areas may have changed. ClearLineCursor(); return nsContainerFrame::ComputeCustomOverflow(aOverflowAreas); } void nsBlockFrame::LazyMarkLinesDirty() { if (GetStateBits() & NS_BLOCK_LOOK_FOR_DIRTY_FRAMES) { for (LineIterator line = LinesBegin(), line_end = LinesEnd(); line != line_end; ++line) { int32_t n = line->GetChildCount(); for (nsIFrame* lineFrame = line->mFirstChild; n > 0; lineFrame = lineFrame->GetNextSibling(), --n) { if (NS_SUBTREE_DIRTY(lineFrame)) { // NOTE: MarkLineDirty does more than just marking the line dirty. MarkLineDirty(line, &mLines); break; } } } RemoveStateBits(NS_BLOCK_LOOK_FOR_DIRTY_FRAMES); } } void nsBlockFrame::MarkLineDirty(LineIterator aLine, const nsLineList* aLineList) { // Mark aLine dirty aLine->MarkDirty(); aLine->SetInvalidateTextRuns(true); #ifdef DEBUG if (gNoisyReflow) { IndentBy(stdout, gNoiseIndent); ListTag(stdout); printf(": mark line %p dirty\n", static_cast(aLine.get())); } #endif // Mark previous line dirty if it's an inline line so that it can // maybe pullup something from the line just affected. // XXX We don't need to do this if aPrevLine ends in a break-after... if (aLine != aLineList->front() && aLine->IsInline() && aLine.prev()->IsInline()) { aLine.prev()->MarkDirty(); aLine.prev()->SetInvalidateTextRuns(true); #ifdef DEBUG if (gNoisyReflow) { IndentBy(stdout, gNoiseIndent); ListTag(stdout); printf(": mark prev-line %p dirty\n", static_cast(aLine.prev().get())); } #endif } } /** * Test whether lines are certain to be aligned left so that we can make * resizing optimizations */ static inline bool IsAlignedLeft(uint8_t aAlignment, uint8_t aDirection, uint8_t aUnicodeBidi, nsIFrame* aFrame) { return aFrame->IsSVGText() || NS_STYLE_TEXT_ALIGN_LEFT == aAlignment || (((NS_STYLE_TEXT_ALIGN_START == aAlignment && NS_STYLE_DIRECTION_LTR == aDirection) || (NS_STYLE_TEXT_ALIGN_END == aAlignment && NS_STYLE_DIRECTION_RTL == aDirection)) && !(NS_STYLE_UNICODE_BIDI_PLAINTEXT & aUnicodeBidi)); } void nsBlockFrame::PrepareResizeReflow(BlockReflowInput& aState) { // See if we can try and avoid marking all the lines as dirty bool tryAndSkipLines = // The left content-edge must be a constant distance from the left // border-edge. !StylePadding()->mPadding.GetLeft().HasPercent(); #ifdef DEBUG if (gDisableResizeOpt) { tryAndSkipLines = false; } if (gNoisyReflow) { if (!tryAndSkipLines) { IndentBy(stdout, gNoiseIndent); ListTag(stdout); printf(": marking all lines dirty: availISize=%d\n", aState.mReflowInput.AvailableISize()); } } #endif if (tryAndSkipLines) { WritingMode wm = aState.mReflowInput.GetWritingMode(); nscoord newAvailISize = aState.mReflowInput.ComputedLogicalBorderPadding().IStart(wm) + aState.mReflowInput.ComputedISize(); NS_ASSERTION(NS_UNCONSTRAINEDSIZE != aState.mReflowInput.ComputedLogicalBorderPadding().IStart(wm) && NS_UNCONSTRAINEDSIZE != aState.mReflowInput.ComputedISize(), "math on NS_UNCONSTRAINEDSIZE"); #ifdef DEBUG if (gNoisyReflow) { IndentBy(stdout, gNoiseIndent); ListTag(stdout); printf(": trying to avoid marking all lines dirty\n"); } #endif for (LineIterator line = LinesBegin(), line_end = LinesEnd(); line != line_end; ++line) { // We let child blocks make their own decisions the same // way we are here. bool isLastLine = line == mLines.back() && !GetNextInFlow(); if (line->IsBlock() || line->HasFloats() || (!isLastLine && !line->HasBreakAfter()) || ((isLastLine || !line->IsLineWrapped())) || line->ResizeReflowOptimizationDisabled() || line->IsImpactedByFloat() || (line->IEnd() > newAvailISize)) { line->MarkDirty(); } #ifdef REALLY_NOISY_REFLOW if (!line->IsBlock()) { printf("PrepareResizeReflow thinks line %p is %simpacted by floats\n", line.get(), line->IsImpactedByFloat() ? "" : "not "); } #endif #ifdef DEBUG if (gNoisyReflow && !line->IsDirty()) { IndentBy(stdout, gNoiseIndent + 1); printf("skipped: line=%p next=%p %s %s%s%s breakTypeBefore/After=%s/%s xmost=%d\n", static_cast(line.get()), static_cast((line.next() != LinesEnd() ? line.next().get() : nullptr)), line->IsBlock() ? "block" : "inline", line->HasBreakAfter() ? "has-break-after " : "", line->HasFloats() ? "has-floats " : "", line->IsImpactedByFloat() ? "impacted " : "", line->BreakTypeToString(line->GetBreakTypeBefore()), line->BreakTypeToString(line->GetBreakTypeAfter()), line->IEnd()); } #endif } } else { // Mark everything dirty for (LineIterator line = LinesBegin(), line_end = LinesEnd(); line != line_end; ++line) { line->MarkDirty(); } } } //---------------------------------------- /** * Propagate reflow "damage" from from earlier lines to the current * line. The reflow damage comes from the following sources: * 1. The regions of float damage remembered during reflow. * 2. The combination of nonzero |aDeltaBCoord| and any impact by a * float, either the previous reflow or now. * * When entering this function, |aLine| is still at its old position and * |aDeltaBCoord| indicates how much it will later be slid (assuming it * doesn't get marked dirty and reflowed entirely). */ void nsBlockFrame::PropagateFloatDamage(BlockReflowInput& aState, nsLineBox* aLine, nscoord aDeltaBCoord) { nsFloatManager *floatManager = aState.mReflowInput.mFloatManager; NS_ASSERTION((aState.mReflowInput.mParentReflowInput && aState.mReflowInput.mParentReflowInput->mFloatManager == floatManager) || aState.mReflowInput.mBlockDelta == 0, "Bad block delta passed in"); // Check to see if there are any floats; if there aren't, there can't // be any float damage if (!floatManager->HasAnyFloats()) return; // Check the damage region recorded in the float damage. if (floatManager->HasFloatDamage()) { // Need to check mBounds *and* mCombinedArea to find intersections // with aLine's floats nscoord lineBCoordBefore = aLine->BStart() + aDeltaBCoord; nscoord lineBCoordAfter = lineBCoordBefore + aLine->BSize(); // Scrollable overflow should be sufficient for things that affect // layout. WritingMode wm = aState.mReflowInput.GetWritingMode(); nsSize containerSize = aState.ContainerSize(); LogicalRect overflow = aLine->GetOverflowArea(eScrollableOverflow, wm, containerSize); nscoord lineBCoordCombinedBefore = overflow.BStart(wm) + aDeltaBCoord; nscoord lineBCoordCombinedAfter = lineBCoordCombinedBefore + overflow.BSize(wm); bool isDirty = floatManager->IntersectsDamage(lineBCoordBefore, lineBCoordAfter) || floatManager->IntersectsDamage(lineBCoordCombinedBefore, lineBCoordCombinedAfter); if (isDirty) { aLine->MarkDirty(); return; } } // Check if the line is moving relative to the float manager if (aDeltaBCoord + aState.mReflowInput.mBlockDelta != 0) { if (aLine->IsBlock()) { // Unconditionally reflow sliding blocks; we only really need to reflow // if there's a float impacting this block, but the current float manager // makes it difficult to check that. Therefore, we let the child block // decide what it needs to reflow. aLine->MarkDirty(); } else { bool wasImpactedByFloat = aLine->IsImpactedByFloat(); nsFlowAreaRect floatAvailableSpace = aState.GetFloatAvailableSpaceForBSize(aLine->BStart() + aDeltaBCoord, aLine->BSize(), nullptr); #ifdef REALLY_NOISY_REFLOW printf("nsBlockFrame::PropagateFloatDamage %p was = %d, is=%d\n", this, wasImpactedByFloat, floatAvailableSpace.mHasFloats); #endif // Mark the line dirty if it was or is affected by a float // We actually only really need to reflow if the amount of impact // changes, but that's not straightforward to check if (wasImpactedByFloat || floatAvailableSpace.mHasFloats) { aLine->MarkDirty(); } } } } static bool LineHasClear(nsLineBox* aLine) { return aLine->IsBlock() ? (aLine->GetBreakTypeBefore() != StyleClear::None || (aLine->mFirstChild->GetStateBits() & NS_BLOCK_HAS_CLEAR_CHILDREN) || !nsBlockFrame::BlockCanIntersectFloats(aLine->mFirstChild)) : aLine->HasFloatBreakAfter(); } /** * Reparent a whole list of floats from aOldParent to this block. The * floats might be taken from aOldParent's overflow list. They will be * removed from the list. They end up appended to our mFloats list. */ void nsBlockFrame::ReparentFloats(nsIFrame* aFirstFrame, nsBlockFrame* aOldParent, bool aReparentSiblings) { nsFrameList list; aOldParent->CollectFloats(aFirstFrame, list, aReparentSiblings); if (list.NotEmpty()) { for (nsIFrame* f : list) { MOZ_ASSERT(!(f->GetStateBits() & NS_FRAME_IS_PUSHED_FLOAT), "CollectFloats should've removed that bit"); ReparentFrame(f, aOldParent, this); } mFloats.AppendFrames(nullptr, list); } } static void DumpLine(const BlockReflowInput& aState, nsLineBox* aLine, nscoord aDeltaBCoord, int32_t aDeltaIndent) { #ifdef DEBUG if (nsBlockFrame::gNoisyReflow) { nsRect ovis(aLine->GetVisualOverflowArea()); nsRect oscr(aLine->GetScrollableOverflowArea()); nsBlockFrame::IndentBy(stdout, nsBlockFrame::gNoiseIndent + aDeltaIndent); printf("line=%p mBCoord=%d dirty=%s oldBounds={%d,%d,%d,%d} oldoverflow-vis={%d,%d,%d,%d} oldoverflow-scr={%d,%d,%d,%d} deltaBCoord=%d mPrevBEndMargin=%d childCount=%d\n", static_cast(aLine), aState.mBCoord, aLine->IsDirty() ? "yes" : "no", aLine->IStart(), aLine->BStart(), aLine->ISize(), aLine->BSize(), ovis.x, ovis.y, ovis.width, ovis.height, oscr.x, oscr.y, oscr.width, oscr.height, aDeltaBCoord, aState.mPrevBEndMargin.get(), aLine->GetChildCount()); } #endif } void nsBlockFrame::ReflowDirtyLines(BlockReflowInput& aState) { bool keepGoing = true; bool repositionViews = false; // should we really need this? bool foundAnyClears = aState.mFloatBreakType != StyleClear::None; bool willReflowAgain = false; #ifdef DEBUG if (gNoisyReflow) { IndentBy(stdout, gNoiseIndent); ListTag(stdout); printf(": reflowing dirty lines"); printf(" computedISize=%d\n", aState.mReflowInput.ComputedISize()); } AutoNoisyIndenter indent(gNoisyReflow); #endif bool selfDirty = (GetStateBits() & NS_FRAME_IS_DIRTY) || (aState.mReflowInput.IsBResize() && (GetStateBits() & NS_FRAME_CONTAINS_RELATIVE_BSIZE)); // Reflow our last line if our availableBSize has increased // so that we (and our last child) pull up content as necessary if (aState.mReflowInput.AvailableBSize() != NS_UNCONSTRAINEDSIZE && GetNextInFlow() && aState.mReflowInput.AvailableBSize() > GetLogicalSize().BSize(aState.mReflowInput.GetWritingMode())) { LineIterator lastLine = LinesEnd(); if (lastLine != LinesBegin()) { --lastLine; lastLine->MarkDirty(); } } // the amount by which we will slide the current line if it is not // dirty nscoord deltaBCoord = 0; // whether we did NOT reflow the previous line and thus we need to // recompute the carried out margin before the line if we want to // reflow it or if its previous margin is dirty bool needToRecoverState = false; // Float continuations were reflowed in ReflowPushedFloats bool reflowedFloat = mFloats.NotEmpty() && (mFloats.FirstChild()->GetStateBits() & NS_FRAME_IS_PUSHED_FLOAT); bool lastLineMovedUp = false; // We save up information about BR-clearance here StyleClear inlineFloatBreakType = aState.mFloatBreakType; LineIterator line = LinesBegin(), line_end = LinesEnd(); // Reflow the lines that are already ours for ( ; line != line_end; ++line, aState.AdvanceToNextLine()) { DumpLine(aState, line, deltaBCoord, 0); #ifdef DEBUG AutoNoisyIndenter indent2(gNoisyReflow); #endif if (selfDirty) line->MarkDirty(); // This really sucks, but we have to look inside any blocks that have clear // elements inside them. // XXX what can we do smarter here? if (!line->IsDirty() && line->IsBlock() && (line->mFirstChild->GetStateBits() & NS_BLOCK_HAS_CLEAR_CHILDREN)) { line->MarkDirty(); } nsIFrame *replacedBlock = nullptr; if (line->IsBlock() && !nsBlockFrame::BlockCanIntersectFloats(line->mFirstChild)) { replacedBlock = line->mFirstChild; } // We have to reflow the line if it's a block whose clearance // might have changed, so detect that. if (!line->IsDirty() && (line->GetBreakTypeBefore() != StyleClear::None || replacedBlock)) { nscoord curBCoord = aState.mBCoord; // See where we would be after applying any clearance due to // BRs. if (inlineFloatBreakType != StyleClear::None) { curBCoord = aState.ClearFloats(curBCoord, inlineFloatBreakType); } nscoord newBCoord = aState.ClearFloats(curBCoord, line->GetBreakTypeBefore(), replacedBlock); if (line->HasClearance()) { // Reflow the line if it might not have clearance anymore. if (newBCoord == curBCoord // aState.mBCoord is the clearance point which should be the // block-start border-edge of the block frame. If sliding the // block by deltaBCoord isn't going to put it in the predicted // position, then we'd better reflow the line. || newBCoord != line->BStart() + deltaBCoord) { line->MarkDirty(); } } else { // Reflow the line if the line might have clearance now. if (curBCoord != newBCoord) { line->MarkDirty(); } } } // We might have to reflow a line that is after a clearing BR. if (inlineFloatBreakType != StyleClear::None) { aState.mBCoord = aState.ClearFloats(aState.mBCoord, inlineFloatBreakType); if (aState.mBCoord != line->BStart() + deltaBCoord) { // SlideLine is not going to put the line where the clearance // put it. Reflow the line to be sure. line->MarkDirty(); } inlineFloatBreakType = StyleClear::None; } bool previousMarginWasDirty = line->IsPreviousMarginDirty(); if (previousMarginWasDirty) { // If the previous margin is dirty, reflow the current line line->MarkDirty(); line->ClearPreviousMarginDirty(); } else if (line->BEnd() + deltaBCoord > aState.mBEndEdge) { // Lines that aren't dirty but get slid past our height constraint must // be reflowed. line->MarkDirty(); } // If we have a constrained height (i.e., breaking columns/pages), // and the distance to the bottom might have changed, then we need // to reflow any line that might have floats in it, both because the // breakpoints within those floats may have changed and because we // might have to push/pull the floats in their entirety. // FIXME: What about a deltaBCoord or block-size change that forces us to // push lines? Why does that work? if (!line->IsDirty() && aState.mReflowInput.AvailableBSize() != NS_UNCONSTRAINEDSIZE && (deltaBCoord != 0 || aState.mReflowInput.IsBResize() || aState.mReflowInput.mFlags.mMustReflowPlaceholders) && (line->IsBlock() || line->HasFloats() || line->HadFloatPushed())) { line->MarkDirty(); } if (!line->IsDirty()) { // See if there's any reflow damage that requires that we mark the // line dirty. PropagateFloatDamage(aState, line, deltaBCoord); } // If the container size has changed, reset mContainerSize. If the // line's writing mode is not ltr, or if the line is not left-aligned, also // mark the line dirty. if (aState.ContainerSize() != line->mContainerSize) { line->mContainerSize = aState.ContainerSize(); bool isLastLine = line == mLines.back() && !GetNextInFlow() && NS_STYLE_TEXT_ALIGN_AUTO == StyleText()->mTextAlignLast; uint8_t align = isLastLine ? StyleText()->mTextAlign : StyleText()->mTextAlignLast; if (line->mWritingMode.IsVertical() || !line->mWritingMode.IsBidiLTR() || !IsAlignedLeft(align, aState.mReflowInput.mStyleVisibility->mDirection, StyleTextReset()->mUnicodeBidi, this)) { line->MarkDirty(); } } if (needToRecoverState && line->IsDirty()) { // We need to reconstruct the block-end margin only if we didn't // reflow the previous line and we do need to reflow (or repair // the block-start position of) the next line. aState.ReconstructMarginBefore(line); } bool reflowedPrevLine = !needToRecoverState; if (needToRecoverState) { needToRecoverState = false; // Update aState.mPrevChild as if we had reflowed all of the frames in // this line. if (line->IsDirty()) { NS_ASSERTION(line->mFirstChild->GetPrevSibling() == line.prev()->LastChild(), "unexpected line frames"); aState.mPrevChild = line->mFirstChild->GetPrevSibling(); } } // Now repair the line and update |aState.mBCoord| by calling // |ReflowLine| or |SlideLine|. // If we're going to reflow everything again, then no need to reflow // the dirty line ... unless the line has floats, in which case we'd // better reflow it now to refresh its float cache, which may contain // dangling frame pointers! Ugh! This reflow of the line may be // incorrect because we skipped reflowing previous lines (e.g., floats // may be placed incorrectly), but that's OK because we'll mark the // line dirty below under "if (aState.mReflowInput.mDiscoveredClearance..." if (line->IsDirty() && (line->HasFloats() || !willReflowAgain)) { lastLineMovedUp = true; bool maybeReflowingForFirstTime = line->IStart() == 0 && line->BStart() == 0 && line->ISize() == 0 && line->BSize() == 0; // Compute the dirty lines "before" BEnd, after factoring in // the running deltaBCoord value - the running value is implicit in // aState.mBCoord. nscoord oldB = line->BStart(); nscoord oldBMost = line->BEnd(); NS_ASSERTION(!willReflowAgain || !line->IsBlock(), "Don't reflow blocks while willReflowAgain is true, reflow of block abs-pos children depends on this"); // Reflow the dirty line. If it's an incremental reflow, then force // it to invalidate the dirty area if necessary ReflowLine(aState, line, &keepGoing); if (aState.mReflowInput.WillReflowAgainForClearance()) { line->MarkDirty(); willReflowAgain = true; // Note that once we've entered this state, every line that gets here // (e.g. because it has floats) gets marked dirty and reflowed again. // in the next pass. This is important, see above. } if (line->HasFloats()) { reflowedFloat = true; } if (!keepGoing) { DumpLine(aState, line, deltaBCoord, -1); if (0 == line->GetChildCount()) { DeleteLine(aState, line, line_end); } break; } // Test to see whether the margin that should be carried out // to the next line (NL) might have changed. In ReflowBlockFrame // we call nextLine->MarkPreviousMarginDirty if the block's // actual carried-out block-end margin changed. So here we only // need to worry about the following effects: // 1) the line was just created, and it might now be blocking // a carried-out block-end margin from previous lines that // used to reach NL from reaching NL // 2) the line used to be empty, and is now not empty, // thus blocking a carried-out block-end margin from previous lines // that used to reach NL from reaching NL // 3) the line wasn't empty, but now is, so a carried-out // block-end margin from previous lines that didn't used to reach NL // now does // 4) the line might have changed in a way that affects NL's // ShouldApplyBStartMargin decision. The three things that matter // are the line's emptiness, its adjacency to the block-start edge of the // block, and whether it has clearance (the latter only matters if the // block was and is adjacent to the block-start and empty). // // If the line is empty now, we can't reliably tell if the line was empty // before, so we just assume it was and do nextLine->MarkPreviousMarginDirty. // This means the checks in 4) are redundant; if the line is empty now // we don't need to check 4), but if the line is not empty now and we're sure // it wasn't empty before, any adjacency and clearance changes are irrelevant // to the result of nextLine->ShouldApplyBStartMargin. if (line.next() != LinesEnd()) { bool maybeWasEmpty = oldB == line.next()->BStart(); bool isEmpty = line->CachedIsEmpty(); if (maybeReflowingForFirstTime /*1*/ || (isEmpty || maybeWasEmpty) /*2/3/4*/) { line.next()->MarkPreviousMarginDirty(); // since it's marked dirty, nobody will care about |deltaBCoord| } } // If the line was just reflowed for the first time, then its // old mBounds cannot be trusted so this deltaBCoord computation is // bogus. But that's OK because we just did // MarkPreviousMarginDirty on the next line which will force it // to be reflowed, so this computation of deltaBCoord will not be // used. deltaBCoord = line->BEnd() - oldBMost; // Now do an interrupt check. We want to do this only in the case when we // actually reflow the line, so that if we get back in here we'll get // further on the reflow before interrupting. aState.mPresContext->CheckForInterrupt(this); } else { aState.mOverflowTracker->Skip(line->mFirstChild, aState.mReflowStatus); // Nop except for blocks (we don't create overflow container // continuations for any inlines atm), so only checking mFirstChild // is enough lastLineMovedUp = deltaBCoord < 0; if (deltaBCoord != 0) SlideLine(aState, line, deltaBCoord); else repositionViews = true; NS_ASSERTION(!line->IsDirty() || !line->HasFloats(), "Possibly stale float cache here!"); if (willReflowAgain && line->IsBlock()) { // If we're going to reflow everything again, and this line is a block, // then there is no need to recover float state. The line may contain // other lines with floats, but in that case RecoverStateFrom would only // add floats to the float manager. We don't need to do that because // everything's going to get reflowed again "for real". Calling // RecoverStateFrom in this situation could be lethal because the // block's descendant lines may have float caches containing dangling // frame pointers. Ugh! // If this line is inline, then we need to recover its state now // to make sure that we don't forget to move its floats by deltaBCoord. } else { // XXX EVIL O(N^2) EVIL aState.RecoverStateFrom(line, deltaBCoord); } // Keep mBCoord up to date in case we're propagating reflow damage // and also because our final height may depend on it. If the // line is inlines, then only update mBCoord if the line is not // empty, because that's what PlaceLine does. (Empty blocks may // want to update mBCoord, e.g. if they have clearance.) if (line->IsBlock() || !line->CachedIsEmpty()) { aState.mBCoord = line->BEnd(); } needToRecoverState = true; if (reflowedPrevLine && !line->IsBlock() && aState.mPresContext->HasPendingInterrupt()) { // Need to make sure to pull overflows from any prev-in-flows for (nsIFrame* inlineKid = line->mFirstChild; inlineKid; inlineKid = inlineKid->PrincipalChildList().FirstChild()) { inlineKid->PullOverflowsFromPrevInFlow(); } } } // Record if we need to clear floats before reflowing the next // line. Note that inlineFloatBreakType will be handled and // cleared before the next line is processed, so there is no // need to combine break types here. if (line->HasFloatBreakAfter()) { inlineFloatBreakType = line->GetBreakTypeAfter(); } if (LineHasClear(line.get())) { foundAnyClears = true; } DumpLine(aState, line, deltaBCoord, -1); if (aState.mPresContext->HasPendingInterrupt()) { willReflowAgain = true; // Another option here might be to leave |line| clean if // !HasPendingInterrupt() before the CheckForInterrupt() call, since in // that case the line really did reflow as it should have. Not sure // whether that would be safe, so doing this for now instead. Also not // sure whether we really want to mark all lines dirty after an // interrupt, but until we get better at propagating float damage we // really do need to do it this way; see comments inside MarkLineDirty. MarkLineDirtyForInterrupt(line); } } // Handle BR-clearance from the last line of the block if (inlineFloatBreakType != StyleClear::None) { aState.mBCoord = aState.ClearFloats(aState.mBCoord, inlineFloatBreakType); } if (needToRecoverState) { // Is this expensive? aState.ReconstructMarginBefore(line); // Update aState.mPrevChild as if we had reflowed all of the frames in // the last line. NS_ASSERTION(line == line_end || line->mFirstChild->GetPrevSibling() == line.prev()->LastChild(), "unexpected line frames"); aState.mPrevChild = line == line_end ? mFrames.LastChild() : line->mFirstChild->GetPrevSibling(); } // Should we really have to do this? if (repositionViews) nsContainerFrame::PlaceFrameView(this); // We can skip trying to pull up the next line if our height is constrained // (so we can report being incomplete) and there is no next in flow or we // were told not to or we know it will be futile, i.e., // -- the next in flow is not changing // -- and we cannot have added more space for its first line to be // pulled up into, // -- it's an incremental reflow of a descendant // -- and we didn't reflow any floats (so the available space // didn't change) // -- my chain of next-in-flows either has no first line, or its first // line isn't dirty. bool heightConstrained = aState.mReflowInput.AvailableBSize() != NS_UNCONSTRAINEDSIZE; bool skipPull = willReflowAgain && heightConstrained; if (!skipPull && heightConstrained && aState.mNextInFlow && (aState.mReflowInput.mFlags.mNextInFlowUntouched && !lastLineMovedUp && !(GetStateBits() & NS_FRAME_IS_DIRTY) && !reflowedFloat)) { // We'll place lineIter at the last line of this block, so that // nsBlockInFlowLineIterator::Next() will take us to the first // line of my next-in-flow-chain. (But first, check that I // have any lines -- if I don't, just bail out of this // optimization.) LineIterator lineIter = this->LinesEnd(); if (lineIter != this->LinesBegin()) { lineIter--; // I have lines; step back from dummy iterator to last line. nsBlockInFlowLineIterator bifLineIter(this, lineIter); // Check for next-in-flow-chain's first line. // (First, see if there is such a line, and second, see if it's clean) if (!bifLineIter.Next() || !bifLineIter.GetLine()->IsDirty()) { skipPull=true; } } } if (skipPull && aState.mNextInFlow) { NS_ASSERTION(heightConstrained, "Height should be constrained here\n"); if (IS_TRUE_OVERFLOW_CONTAINER(aState.mNextInFlow)) NS_FRAME_SET_OVERFLOW_INCOMPLETE(aState.mReflowStatus); else NS_FRAME_SET_INCOMPLETE(aState.mReflowStatus); } if (!skipPull && aState.mNextInFlow) { // Pull data from a next-in-flow if there's still room for more // content here. while (keepGoing && aState.mNextInFlow) { // Grab first line from our next-in-flow nsBlockFrame* nextInFlow = aState.mNextInFlow; nsLineBox* pulledLine; nsFrameList pulledFrames; if (!nextInFlow->mLines.empty()) { RemoveFirstLine(nextInFlow->mLines, nextInFlow->mFrames, &pulledLine, &pulledFrames); } else { // Grab an overflow line if there are any FrameLines* overflowLines = nextInFlow->GetOverflowLines(); if (!overflowLines) { aState.mNextInFlow = static_cast(nextInFlow->GetNextInFlow()); continue; } bool last = RemoveFirstLine(overflowLines->mLines, overflowLines->mFrames, &pulledLine, &pulledFrames); if (last) { nextInFlow->DestroyOverflowLines(); } } if (pulledFrames.IsEmpty()) { // The line is empty. Try the next one. NS_ASSERTION(pulledLine->GetChildCount() == 0 && !pulledLine->mFirstChild, "bad empty line"); nextInFlow->FreeLineBox(pulledLine); continue; } if (pulledLine == nextInFlow->GetLineCursor()) { nextInFlow->ClearLineCursor(); } ReparentFrames(pulledFrames, nextInFlow, this); NS_ASSERTION(pulledFrames.LastChild() == pulledLine->LastChild(), "Unexpected last frame"); NS_ASSERTION(aState.mPrevChild || mLines.empty(), "should have a prevchild here"); NS_ASSERTION(aState.mPrevChild == mFrames.LastChild(), "Incorrect aState.mPrevChild before inserting line at end"); // Shift pulledLine's frames into our mFrames list. mFrames.AppendFrames(nullptr, pulledFrames); // Add line to our line list, and set its last child as our new prev-child line = mLines.before_insert(LinesEnd(), pulledLine); aState.mPrevChild = mFrames.LastChild(); // Reparent floats whose placeholders are in the line. ReparentFloats(pulledLine->mFirstChild, nextInFlow, true); DumpLine(aState, pulledLine, deltaBCoord, 0); #ifdef DEBUG AutoNoisyIndenter indent2(gNoisyReflow); #endif if (aState.mPresContext->HasPendingInterrupt()) { MarkLineDirtyForInterrupt(line); } else { // Now reflow it and any lines that it makes during it's reflow // (we have to loop here because reflowing the line may cause a new // line to be created; see SplitLine's callers for examples of // when this happens). while (line != LinesEnd()) { ReflowLine(aState, line, &keepGoing); if (aState.mReflowInput.WillReflowAgainForClearance()) { line->MarkDirty(); keepGoing = false; NS_FRAME_SET_INCOMPLETE(aState.mReflowStatus); break; } DumpLine(aState, line, deltaBCoord, -1); if (!keepGoing) { if (0 == line->GetChildCount()) { DeleteLine(aState, line, line_end); } break; } if (LineHasClear(line.get())) { foundAnyClears = true; } if (aState.mPresContext->CheckForInterrupt(this)) { MarkLineDirtyForInterrupt(line); break; } // If this is an inline frame then its time to stop ++line; aState.AdvanceToNextLine(); } } } if (NS_FRAME_IS_NOT_COMPLETE(aState.mReflowStatus)) { aState.mReflowStatus |= NS_FRAME_REFLOW_NEXTINFLOW; } //XXXfr shouldn't set this flag when nextinflow has no lines } // Handle an odd-ball case: a list-item with no lines if (HasOutsideBullet() && mLines.empty()) { ReflowOutput metrics(aState.mReflowInput); nsIFrame* bullet = GetOutsideBullet(); WritingMode wm = aState.mReflowInput.GetWritingMode(); ReflowBullet(bullet, aState, metrics, aState.mReflowInput.ComputedPhysicalBorderPadding().top); NS_ASSERTION(!BulletIsEmpty() || metrics.BSize(wm) == 0, "empty bullet took up space"); if (!BulletIsEmpty()) { // There are no lines so we have to fake up some y motion so that // we end up with *some* height. if (metrics.BlockStartAscent() == ReflowOutput::ASK_FOR_BASELINE) { nscoord ascent; WritingMode wm = aState.mReflowInput.GetWritingMode(); if (nsLayoutUtils::GetFirstLineBaseline(wm, bullet, &ascent)) { metrics.SetBlockStartAscent(ascent); } else { metrics.SetBlockStartAscent(metrics.BSize(wm)); } } RefPtr fm = nsLayoutUtils::GetInflatedFontMetricsForFrame(this); nscoord minAscent = nsLayoutUtils::GetCenteredFontBaseline(fm, aState.mMinLineHeight, wm.IsLineInverted()); nscoord minDescent = aState.mMinLineHeight - minAscent; aState.mBCoord += std::max(minAscent, metrics.BlockStartAscent()) + std::max(minDescent, metrics.BSize(wm) - metrics.BlockStartAscent()); nscoord offset = minAscent - metrics.BlockStartAscent(); if (offset > 0) { bullet->SetRect(bullet->GetRect() + nsPoint(0, offset)); } } } if (foundAnyClears) { AddStateBits(NS_BLOCK_HAS_CLEAR_CHILDREN); } else { RemoveStateBits(NS_BLOCK_HAS_CLEAR_CHILDREN); } #ifdef DEBUG VerifyLines(true); VerifyOverflowSituation(); if (gNoisyReflow) { IndentBy(stdout, gNoiseIndent - 1); ListTag(stdout); printf(": done reflowing dirty lines (status=%x)\n", aState.mReflowStatus); } #endif } void nsBlockFrame::MarkLineDirtyForInterrupt(nsLineBox* aLine) { aLine->MarkDirty(); // Just checking NS_FRAME_IS_DIRTY is ok, because we've already // marked the lines that need to be marked dirty based on our // vertical resize stuff. So we'll definitely reflow all those kids; // the only question is how they should behave. if (GetStateBits() & NS_FRAME_IS_DIRTY) { // Mark all our child frames dirty so we make sure to reflow them // later. int32_t n = aLine->GetChildCount(); for (nsIFrame* f = aLine->mFirstChild; n > 0; f = f->GetNextSibling(), --n) { f->AddStateBits(NS_FRAME_IS_DIRTY); } // And mark all the floats whose reflows we might be skipping dirty too. if (aLine->HasFloats()) { for (nsFloatCache* fc = aLine->GetFirstFloat(); fc; fc = fc->Next()) { fc->mFloat->AddStateBits(NS_FRAME_IS_DIRTY); } } } else { // Dirty all the descendant lines of block kids to handle float damage, // since our nsFloatManager will go away by the next time we're reflowing. // XXXbz Can we do something more like what PropagateFloatDamage does? // Would need to sort out the exact business with mBlockDelta for that.... // This marks way too much dirty. If we ever make this better, revisit // which lines we mark dirty in the interrupt case in ReflowDirtyLines. nsBlockFrame* bf = nsLayoutUtils::GetAsBlock(aLine->mFirstChild); if (bf) { MarkAllDescendantLinesDirty(bf); } } } void nsBlockFrame::DeleteLine(BlockReflowInput& aState, nsLineList::iterator aLine, nsLineList::iterator aLineEnd) { NS_PRECONDITION(0 == aLine->GetChildCount(), "can't delete !empty line"); if (0 == aLine->GetChildCount()) { NS_ASSERTION(aState.mCurrentLine == aLine, "using function more generally than designed, " "but perhaps OK now"); nsLineBox* line = aLine; aLine = mLines.erase(aLine); FreeLineBox(line); // Mark the previous margin of the next line dirty since we need to // recompute its top position. if (aLine != aLineEnd) aLine->MarkPreviousMarginDirty(); } } /** * Reflow a line. The line will either contain a single block frame * or contain 1 or more inline frames. aKeepReflowGoing indicates * whether or not the caller should continue to reflow more lines. */ void nsBlockFrame::ReflowLine(BlockReflowInput& aState, LineIterator aLine, bool* aKeepReflowGoing) { MOZ_ASSERT(aLine->GetChildCount(), "reflowing empty line"); // Setup the line-layout for the new line aState.mCurrentLine = aLine; aLine->ClearDirty(); aLine->InvalidateCachedIsEmpty(); aLine->ClearHadFloatPushed(); // Now that we know what kind of line we have, reflow it if (aLine->IsBlock()) { ReflowBlockFrame(aState, aLine, aKeepReflowGoing); } else { aLine->SetLineWrapped(false); ReflowInlineFrames(aState, aLine, aKeepReflowGoing); } } nsIFrame* nsBlockFrame::PullFrame(BlockReflowInput& aState, LineIterator aLine) { // First check our remaining lines. if (LinesEnd() != aLine.next()) { return PullFrameFrom(aLine, this, aLine.next()); } NS_ASSERTION(!GetOverflowLines(), "Our overflow lines should have been removed at the start of reflow"); // Try each next-in-flow. nsBlockFrame* nextInFlow = aState.mNextInFlow; while (nextInFlow) { if (nextInFlow->mLines.empty()) { nextInFlow->DrainSelfOverflowList(); } if (!nextInFlow->mLines.empty()) { return PullFrameFrom(aLine, nextInFlow, nextInFlow->mLines.begin()); } nextInFlow = static_cast(nextInFlow->GetNextInFlow()); aState.mNextInFlow = nextInFlow; } return nullptr; } nsIFrame* nsBlockFrame::PullFrameFrom(nsLineBox* aLine, nsBlockFrame* aFromContainer, nsLineList::iterator aFromLine) { nsLineBox* fromLine = aFromLine; MOZ_ASSERT(fromLine, "bad line to pull from"); MOZ_ASSERT(fromLine->GetChildCount(), "empty line"); MOZ_ASSERT(aLine->GetChildCount(), "empty line"); NS_ASSERTION(fromLine->IsBlock() == fromLine->mFirstChild->IsBlockOutside(), "Disagreement about whether it's a block or not"); if (fromLine->IsBlock()) { // If our line is not empty and the child in aFromLine is a block // then we cannot pull up the frame into this line. In this case // we stop pulling. return nullptr; } // Take frame from fromLine nsIFrame* frame = fromLine->mFirstChild; nsIFrame* newFirstChild = frame->GetNextSibling(); if (aFromContainer != this) { // The frame is being pulled from a next-in-flow; therefore we // need to add it to our sibling list. MOZ_ASSERT(aLine == mLines.back()); MOZ_ASSERT(aFromLine == aFromContainer->mLines.begin(), "should only pull from first line"); aFromContainer->mFrames.RemoveFrame(frame); // When pushing and pulling frames we need to check for whether any // views need to be reparented. ReparentFrame(frame, aFromContainer, this); mFrames.AppendFrame(nullptr, frame); // The frame might have (or contain) floats that need to be brought // over too. (pass 'false' since there are no siblings to check) ReparentFloats(frame, aFromContainer, false); } else { MOZ_ASSERT(aLine == aFromLine.prev()); } aLine->NoteFrameAdded(frame); fromLine->NoteFrameRemoved(frame); if (fromLine->GetChildCount() > 0) { // Mark line dirty now that we pulled a child fromLine->MarkDirty(); fromLine->mFirstChild = newFirstChild; } else { // Free up the fromLine now that it's empty. // Its bounds might need to be redrawn, though. if (aFromLine.next() != aFromContainer->mLines.end()) { aFromLine.next()->MarkPreviousMarginDirty(); } aFromContainer->mLines.erase(aFromLine); // aFromLine is now invalid aFromContainer->FreeLineBox(fromLine); } #ifdef DEBUG VerifyLines(true); VerifyOverflowSituation(); #endif return frame; } void nsBlockFrame::SlideLine(BlockReflowInput& aState, nsLineBox* aLine, nscoord aDeltaBCoord) { NS_PRECONDITION(aDeltaBCoord != 0, "why slide a line nowhere?"); // Adjust line state aLine->SlideBy(aDeltaBCoord, aState.ContainerSize()); // Adjust the frames in the line MoveChildFramesOfLine(aLine, aDeltaBCoord); } void nsBlockFrame::UpdateLineContainerSize(nsLineBox* aLine, const nsSize& aNewContainerSize) { if (aNewContainerSize == aLine->mContainerSize) { return; } // Adjust line state nsSize sizeDelta = aLine->UpdateContainerSize(aNewContainerSize); // Changing container width only matters if writing mode is vertical-rl if (GetWritingMode().IsVerticalRL()) { MoveChildFramesOfLine(aLine, sizeDelta.width); } } void nsBlockFrame::MoveChildFramesOfLine(nsLineBox* aLine, nscoord aDeltaBCoord) { // Adjust the frames in the line nsIFrame* kid = aLine->mFirstChild; if (!kid) { return; } WritingMode wm = GetWritingMode(); LogicalPoint translation(wm, 0, aDeltaBCoord); if (aLine->IsBlock()) { if (aDeltaBCoord) { kid->MovePositionBy(wm, translation); } // Make sure the frame's view and any child views are updated nsContainerFrame::PlaceFrameView(kid); } else { // Adjust the block-dir coordinate of the frames in the line. // Note: we need to re-position views even if aDeltaBCoord is 0, because // one of our parent frames may have moved and so the view's position // relative to its parent may have changed. int32_t n = aLine->GetChildCount(); while (--n >= 0) { if (aDeltaBCoord) { kid->MovePositionBy(wm, translation); } // Make sure the frame's view and any child views are updated nsContainerFrame::PlaceFrameView(kid); kid = kid->GetNextSibling(); } } } nsresult nsBlockFrame::AttributeChanged(int32_t aNameSpaceID, nsIAtom* aAttribute, int32_t aModType) { nsresult rv = nsContainerFrame::AttributeChanged(aNameSpaceID, aAttribute, aModType); if (NS_FAILED(rv)) { return rv; } if (nsGkAtoms::value == aAttribute) { const nsStyleDisplay* styleDisplay = StyleDisplay(); if (mozilla::StyleDisplay::ListItem == styleDisplay->mDisplay) { // Search for the closest ancestor that's a block frame. We // make the assumption that all related list items share a // common block/grid/flex ancestor. // XXXldb I think that's a bad assumption. nsContainerFrame* ancestor = GetParent(); for (; ancestor; ancestor = ancestor->GetParent()) { auto frameType = ancestor->GetType(); if (frameType == nsGkAtoms::blockFrame || frameType == nsGkAtoms::flexContainerFrame || frameType == nsGkAtoms::gridContainerFrame) { break; } } // Tell the ancestor to renumber list items within itself. if (ancestor) { // XXX Not sure if this is necessary anymore if (ancestor->RenumberList()) { PresContext()->PresShell()-> FrameNeedsReflow(ancestor, nsIPresShell::eStyleChange, NS_FRAME_HAS_DIRTY_CHILDREN); } } } } return rv; } static inline bool IsNonAutoNonZeroBSize(const nsStyleCoord& aCoord) { nsStyleUnit unit = aCoord.GetUnit(); if (unit == eStyleUnit_Auto || // The enumerated values were originally aimed at inline-size // (or width, as it was before logicalization). For now, let them // return false here, so we treat them like 'auto' pending a // real implementation. (See bug 1126420.) // // FIXME (bug 567039, bug 527285) // This isn't correct for the 'fill' value, which should more // likely (but not necessarily, depending on the available space) // be returning true. unit == eStyleUnit_Enumerated) { return false; } if (aCoord.IsCoordPercentCalcUnit()) { // If we evaluate the length/percent/calc at a percentage basis of // both nscoord_MAX and 0, and it's zero both ways, then it's a zero // length, percent, or combination thereof. Test > 0 so we clamp // negative calc() results to 0. return nsRuleNode::ComputeCoordPercentCalc(aCoord, nscoord_MAX) > 0 || nsRuleNode::ComputeCoordPercentCalc(aCoord, 0) > 0; } MOZ_ASSERT(false, "unexpected unit for height or min-height"); return true; } /* virtual */ bool nsBlockFrame::IsSelfEmpty() { // Blocks which are margin-roots (including inline-blocks) cannot be treated // as empty for margin-collapsing and other purposes. They're more like // replaced elements. if (GetStateBits() & NS_BLOCK_MARGIN_ROOT) { return false; } WritingMode wm = GetWritingMode(); const nsStylePosition* position = StylePosition(); if (IsNonAutoNonZeroBSize(position->MinBSize(wm)) || IsNonAutoNonZeroBSize(position->BSize(wm))) { return false; } const nsStyleBorder* border = StyleBorder(); const nsStylePadding* padding = StylePadding(); if (border->GetComputedBorderWidth(wm.PhysicalSide(eLogicalSideBStart)) != 0 || border->GetComputedBorderWidth(wm.PhysicalSide(eLogicalSideBEnd)) != 0 || !nsLayoutUtils::IsPaddingZero(padding->mPadding.GetBStart(wm)) || !nsLayoutUtils::IsPaddingZero(padding->mPadding.GetBEnd(wm))) { return false; } if (HasOutsideBullet() && !BulletIsEmpty()) { return false; } return true; } bool nsBlockFrame::CachedIsEmpty() { if (!IsSelfEmpty()) { return false; } for (LineIterator line = LinesBegin(), line_end = LinesEnd(); line != line_end; ++line) { if (!line->CachedIsEmpty()) return false; } return true; } bool nsBlockFrame::IsEmpty() { if (!IsSelfEmpty()) { return false; } for (LineIterator line = LinesBegin(), line_end = LinesEnd(); line != line_end; ++line) { if (!line->IsEmpty()) return false; } return true; } bool nsBlockFrame::ShouldApplyBStartMargin(BlockReflowInput& aState, nsLineBox* aLine, nsIFrame* aChildFrame) { if (aState.mFlags.mShouldApplyBStartMargin) { // Apply short-circuit check to avoid searching the line list return true; } if (!aState.IsAdjacentWithTop() || aChildFrame->StyleBorder()->mBoxDecorationBreak == StyleBoxDecorationBreak::Clone) { // If we aren't at the start block-coordinate then something of non-zero // height must have been placed. Therefore the childs block-start margin // applies. aState.mFlags.mShouldApplyBStartMargin = true; return true; } // Determine if this line is "essentially" the first line LineIterator line = LinesBegin(); if (aState.mFlags.mHasLineAdjacentToTop) { line = aState.mLineAdjacentToTop; } while (line != aLine) { if (!line->CachedIsEmpty() || line->HasClearance()) { // A line which precedes aLine is non-empty, or has clearance, // so therefore the block-start margin applies. aState.mFlags.mShouldApplyBStartMargin = true; return true; } // No need to apply the block-start margin if the line has floats. We // should collapse anyway (bug 44419) ++line; aState.mFlags.mHasLineAdjacentToTop = true; aState.mLineAdjacentToTop = line; } // The line being reflowed is "essentially" the first line in the // block. Therefore its block-start margin will be collapsed by the // generational collapsing logic with its parent (us). return false; } void nsBlockFrame::ReflowBlockFrame(BlockReflowInput& aState, LineIterator aLine, bool* aKeepReflowGoing) { NS_PRECONDITION(*aKeepReflowGoing, "bad caller"); nsIFrame* frame = aLine->mFirstChild; if (!frame) { NS_ASSERTION(false, "program error - unexpected empty line"); return; } // Prepare the block reflow engine nsBlockReflowContext brc(aState.mPresContext, aState.mReflowInput); StyleClear breakType = frame->StyleDisplay()-> PhysicalBreakType(aState.mReflowInput.GetWritingMode()); if (StyleClear::None != aState.mFloatBreakType) { breakType = nsLayoutUtils::CombineBreakType(breakType, aState.mFloatBreakType); aState.mFloatBreakType = StyleClear::None; } // Clear past floats before the block if the clear style is not none aLine->SetBreakTypeBefore(breakType); // See if we should apply the block-start margin. If the block frame being // reflowed is a continuation (non-null prev-in-flow) then we don't // apply its block-start margin because it's not significant unless it has // 'box-decoration-break:clone'. Otherwise, dig deeper. bool applyBStartMargin = (frame->StyleBorder()->mBoxDecorationBreak == StyleBoxDecorationBreak::Clone || !frame->GetPrevInFlow()) && ShouldApplyBStartMargin(aState, aLine, frame); if (applyBStartMargin) { // The HasClearance setting is only valid if ShouldApplyBStartMargin // returned false (in which case the block-start margin-root set our // clearance flag). Otherwise clear it now. We'll set it later on // ourselves if necessary. aLine->ClearHasClearance(); } bool treatWithClearance = aLine->HasClearance(); bool mightClearFloats = breakType != StyleClear::None; nsIFrame *replacedBlock = nullptr; if (!nsBlockFrame::BlockCanIntersectFloats(frame)) { mightClearFloats = true; replacedBlock = frame; } // If our block-start margin was counted as part of some parent's block-start // margin collapse, and we are being speculatively reflowed assuming this // frame DID NOT need clearance, then we need to check that // assumption. if (!treatWithClearance && !applyBStartMargin && mightClearFloats && aState.mReflowInput.mDiscoveredClearance) { nscoord curBCoord = aState.mBCoord + aState.mPrevBEndMargin.get(); nscoord clearBCoord = aState.ClearFloats(curBCoord, breakType, replacedBlock); if (clearBCoord != curBCoord) { // Only record the first frame that requires clearance if (!*aState.mReflowInput.mDiscoveredClearance) { *aState.mReflowInput.mDiscoveredClearance = frame; } aState.mPrevChild = frame; // Exactly what we do now is flexible since we'll definitely be // reflowed. return; } } if (treatWithClearance) { applyBStartMargin = true; } nsIFrame* clearanceFrame = nullptr; nscoord startingBCoord = aState.mBCoord; nsCollapsingMargin incomingMargin = aState.mPrevBEndMargin; nscoord clearance; // Save the original position of the frame so that we can reposition // its view as needed. nsPoint originalPosition = frame->GetPosition(); while (true) { clearance = 0; nscoord bStartMargin = 0; bool mayNeedRetry = false; bool clearedFloats = false; if (applyBStartMargin) { // Precompute the blocks block-start margin value so that we can get the // correct available space (there might be a float that's // already been placed below the aState.mPrevBEndMargin // Setup a reflowInput to get the style computed block-start margin // value. We'll use a reason of `resize' so that we don't fudge // any incremental reflow state. // The availSpace here is irrelevant to our needs - all we want // out if this setup is the block-start margin value which doesn't depend // on the childs available space. // XXX building a complete ReflowInput just to get the block-start // margin seems like a waste. And we do this for almost every block! WritingMode wm = frame->GetWritingMode(); LogicalSize availSpace = aState.ContentSize(wm); ReflowInput reflowInput(aState.mPresContext, aState.mReflowInput, frame, availSpace); if (treatWithClearance) { aState.mBCoord += aState.mPrevBEndMargin.get(); aState.mPrevBEndMargin.Zero(); } // Now compute the collapsed margin-block-start value into // aState.mPrevBEndMargin, assuming that all child margins // collapse down to clearanceFrame. brc.ComputeCollapsedBStartMargin(reflowInput, &aState.mPrevBEndMargin, clearanceFrame, &mayNeedRetry); // XXX optimization; we could check the collapsing children to see if they are sure // to require clearance, and so avoid retrying them if (clearanceFrame) { // Don't allow retries on the second pass. The clearance decisions for the // blocks whose block-start margins collapse with ours are now fixed. mayNeedRetry = false; } if (!treatWithClearance && !clearanceFrame && mightClearFloats) { // We don't know if we need clearance and this is the first, // optimistic pass. So determine whether *this block* needs // clearance. Note that we do not allow the decision for whether // this block has clearance to change on the second pass; that // decision is only allowed to be made under the optimistic // first pass. nscoord curBCoord = aState.mBCoord + aState.mPrevBEndMargin.get(); nscoord clearBCoord = aState.ClearFloats(curBCoord, breakType, replacedBlock); if (clearBCoord != curBCoord) { // Looks like we need clearance and we didn't know about it already. So // recompute collapsed margin treatWithClearance = true; // Remember this decision, needed for incremental reflow aLine->SetHasClearance(); // Apply incoming margins aState.mBCoord += aState.mPrevBEndMargin.get(); aState.mPrevBEndMargin.Zero(); // Compute the collapsed margin again, ignoring the incoming margin this time mayNeedRetry = false; brc.ComputeCollapsedBStartMargin(reflowInput, &aState.mPrevBEndMargin, clearanceFrame, &mayNeedRetry); } } // Temporarily advance the running Y value so that the // GetAvailableSpace method will return the right available // space. This undone as soon as the horizontal margins are // computed. bStartMargin = aState.mPrevBEndMargin.get(); if (treatWithClearance) { nscoord currentBCoord = aState.mBCoord; // advance mBCoord to the clear position. aState.mBCoord = aState.ClearFloats(aState.mBCoord, breakType, replacedBlock); clearedFloats = aState.mBCoord != currentBCoord; // Compute clearance. It's the amount we need to add to the block-start // border-edge of the frame, after applying collapsed margins // from the frame and its children, to get it to line up with // the block-end of the floats. The former is // currentBCoord + bStartMargin, the latter is the current // aState.mBCoord. // Note that negative clearance is possible clearance = aState.mBCoord - (currentBCoord + bStartMargin); // Add clearance to our block-start margin while we compute available // space for the frame bStartMargin += clearance; // Note that aState.mBCoord should stay where it is: at the block-start // border-edge of the frame } else { // Advance aState.mBCoord to the block-start border-edge of the frame. aState.mBCoord += bStartMargin; } } aLine->SetLineIsImpactedByFloat(false); // Here aState.mBCoord is the block-start border-edge of the block. // Compute the available space for the block nsFlowAreaRect floatAvailableSpace = aState.GetFloatAvailableSpace(); WritingMode wm = aState.mReflowInput.GetWritingMode(); LogicalRect availSpace(wm); aState.ComputeBlockAvailSpace(frame, floatAvailableSpace, replacedBlock != nullptr, availSpace); // The check for // (!aState.mReflowInput.mFlags.mIsTopOfPage || clearedFloats) // is to some degree out of paranoia: if we reliably eat up block-start // margins at the top of the page as we ought to, it wouldn't be // needed. if ((!aState.mReflowInput.mFlags.mIsTopOfPage || clearedFloats) && availSpace.BSize(wm) < 0) { // We know already that this child block won't fit on this // page/column due to the block-start margin or the clearance. So we // need to get out of here now. (If we don't, most blocks will handle // things fine, and report break-before, but zero-height blocks // won't, and will thus make their parent overly-large and force // *it* to be pushed in its entirety.) // Doing this means that we also don't need to worry about the // |availSpace.BSize(wm) += bStartMargin| below interacting with // pushed floats (which force nscoord_MAX clearance) to cause a // constrained block size to turn into an unconstrained one. aState.mBCoord = startingBCoord; aState.mPrevBEndMargin = incomingMargin; *aKeepReflowGoing = false; if (ShouldAvoidBreakInside(aState.mReflowInput)) { aState.mReflowStatus = NS_INLINE_LINE_BREAK_BEFORE(); } else { PushLines(aState, aLine.prev()); NS_FRAME_SET_INCOMPLETE(aState.mReflowStatus); } return; } // Now put the block-dir coordinate back to the start of the // block-start-margin + clearance. aState.mBCoord -= bStartMargin; availSpace.BStart(wm) -= bStartMargin; if (NS_UNCONSTRAINEDSIZE != availSpace.BSize(wm)) { availSpace.BSize(wm) += bStartMargin; } // construct the html reflow state for the block. ReflowBlock // will initialize it. Maybe blockHtmlRI; blockHtmlRI.emplace( aState.mPresContext, aState.mReflowInput, frame, availSpace.Size(wm).ConvertTo(frame->GetWritingMode(), wm)); nsFloatManager::SavedState floatManagerState; nsReflowStatus frameReflowStatus; do { if (floatAvailableSpace.mHasFloats) { // Set if floatAvailableSpace.mHasFloats is true for any // iteration of the loop. aLine->SetLineIsImpactedByFloat(true); } // We might need to store into mDiscoveredClearance later if it's // currently null; we want to overwrite any writes that // brc.ReflowBlock() below does, so we need to remember now // whether it's empty. const bool shouldStoreClearance = aState.mReflowInput.mDiscoveredClearance && !*aState.mReflowInput.mDiscoveredClearance; // Reflow the block into the available space if (mayNeedRetry || replacedBlock) { aState.mFloatManager->PushState(&floatManagerState); } if (mayNeedRetry) { blockHtmlRI->mDiscoveredClearance = &clearanceFrame; } else if (!applyBStartMargin) { blockHtmlRI->mDiscoveredClearance = aState.mReflowInput.mDiscoveredClearance; } frameReflowStatus = NS_FRAME_COMPLETE; brc.ReflowBlock(availSpace, applyBStartMargin, aState.mPrevBEndMargin, clearance, aState.IsAdjacentWithTop(), aLine.get(), *blockHtmlRI, frameReflowStatus, aState); // Now the block has a height. Using that height, get the // available space again and call ComputeBlockAvailSpace again. // If ComputeBlockAvailSpace gives a different result, we need to // reflow again. if (!replacedBlock) { break; } LogicalRect oldFloatAvailableSpaceRect(floatAvailableSpace.mRect); floatAvailableSpace = aState.GetFloatAvailableSpaceForBSize( aState.mBCoord + bStartMargin, brc.GetMetrics().BSize(wm), &floatManagerState); NS_ASSERTION(floatAvailableSpace.mRect.BStart(wm) == oldFloatAvailableSpaceRect.BStart(wm), "yikes"); // Restore the height to the position of the next band. floatAvailableSpace.mRect.BSize(wm) = oldFloatAvailableSpaceRect.BSize(wm); // Determine whether the available space shrunk on either side, // because (the first time round) we now know the block's height, // and it may intersect additional floats, or (on later // iterations) because narrowing the width relative to the // previous time may cause the block to become taller. Note that // since we're reflowing the block, narrowing the width might also // make it shorter, so we must pass aCanGrow as true. if (!AvailableSpaceShrunk(wm, oldFloatAvailableSpaceRect, floatAvailableSpace.mRect, true)) { // The size and position we chose before are fine (i.e., they // don't cause intersecting with floats that requires a change // in size or position), so we're done. break; } bool advanced = false; if (!aState.ReplacedBlockFitsInAvailSpace(replacedBlock, floatAvailableSpace)) { // Advance to the next band. nscoord newBCoord = aState.mBCoord; if (aState.AdvanceToNextBand(floatAvailableSpace.mRect, &newBCoord)) { advanced = true; } // ClearFloats might be able to advance us further once we're there. aState.mBCoord = aState.ClearFloats(newBCoord, StyleClear::None, replacedBlock); // Start over with a new available space rect at the new height. floatAvailableSpace = aState.GetFloatAvailableSpaceWithState(aState.mBCoord, &floatManagerState); } LogicalRect oldAvailSpace(availSpace); aState.ComputeBlockAvailSpace(frame, floatAvailableSpace, replacedBlock != nullptr, availSpace); if (!advanced && availSpace.IsEqualEdges(oldAvailSpace)) { break; } // We need another reflow. aState.mFloatManager->PopState(&floatManagerState); if (!treatWithClearance && !applyBStartMargin && aState.mReflowInput.mDiscoveredClearance) { // We set shouldStoreClearance above to record only the first // frame that requires clearance. if (shouldStoreClearance) { *aState.mReflowInput.mDiscoveredClearance = frame; } aState.mPrevChild = frame; // Exactly what we do now is flexible since we'll definitely be // reflowed. return; } if (advanced) { // We're pushing down the border-box, so we don't apply margin anymore. // This should never cause us to move up since the call to // GetFloatAvailableSpaceForBSize above included the margin. applyBStartMargin = false; bStartMargin = 0; treatWithClearance = true; // avoid hitting test above clearance = 0; } blockHtmlRI.reset(); blockHtmlRI.emplace( aState.mPresContext, aState.mReflowInput, frame, availSpace.Size(wm).ConvertTo(frame->GetWritingMode(), wm)); } while (true); if (mayNeedRetry && clearanceFrame) { aState.mFloatManager->PopState(&floatManagerState); aState.mBCoord = startingBCoord; aState.mPrevBEndMargin = incomingMargin; continue; } aState.mPrevChild = frame; if (blockHtmlRI->WillReflowAgainForClearance()) { // If an ancestor of ours is going to reflow for clearance, we // need to avoid calling PlaceBlock, because it unsets dirty bits // on the child block (both itself, and through its call to // nsFrame::DidReflow), and those dirty bits imply dirtiness for // all of the child block, including the lines it didn't reflow. NS_ASSERTION(originalPosition == frame->GetPosition(), "we need to call PositionChildViews"); return; } #if defined(REFLOW_STATUS_COVERAGE) RecordReflowStatus(true, frameReflowStatus); #endif if (NS_INLINE_IS_BREAK_BEFORE(frameReflowStatus)) { // None of the child block fits. *aKeepReflowGoing = false; if (ShouldAvoidBreakInside(aState.mReflowInput)) { aState.mReflowStatus = NS_INLINE_LINE_BREAK_BEFORE(); } else { PushLines(aState, aLine.prev()); NS_FRAME_SET_INCOMPLETE(aState.mReflowStatus); } } else { // Note: line-break-after a block is a nop // Try to place the child block. // Don't force the block to fit if we have positive clearance, because // pushing it to the next page would give it more room. // Don't force the block to fit if it's impacted by a float. If it is, // then pushing it to the next page would give it more room. Note that // isImpacted doesn't include impact from the block's own floats. bool forceFit = aState.IsAdjacentWithTop() && clearance <= 0 && !floatAvailableSpace.mHasFloats; nsCollapsingMargin collapsedBEndMargin; nsOverflowAreas overflowAreas; *aKeepReflowGoing = brc.PlaceBlock(*blockHtmlRI, forceFit, aLine.get(), collapsedBEndMargin, overflowAreas, frameReflowStatus); if (!NS_FRAME_IS_FULLY_COMPLETE(frameReflowStatus) && ShouldAvoidBreakInside(aState.mReflowInput)) { *aKeepReflowGoing = false; } if (aLine->SetCarriedOutBEndMargin(collapsedBEndMargin)) { LineIterator nextLine = aLine; ++nextLine; if (nextLine != LinesEnd()) { nextLine->MarkPreviousMarginDirty(); } } aLine->SetOverflowAreas(overflowAreas); if (*aKeepReflowGoing) { // Some of the child block fit // Advance to new Y position nscoord newBCoord = aLine->BEnd(); aState.mBCoord = newBCoord; // Continue the block frame now if it didn't completely fit in // the available space. if (!NS_FRAME_IS_FULLY_COMPLETE(frameReflowStatus)) { bool madeContinuation = CreateContinuationFor(aState, nullptr, frame); nsIFrame* nextFrame = frame->GetNextInFlow(); NS_ASSERTION(nextFrame, "We're supposed to have a next-in-flow by now"); if (NS_FRAME_IS_NOT_COMPLETE(frameReflowStatus)) { // If nextFrame used to be an overflow container, make it a normal block if (!madeContinuation && (NS_FRAME_IS_OVERFLOW_CONTAINER & nextFrame->GetStateBits())) { nsOverflowContinuationTracker::AutoFinish fini(aState.mOverflowTracker, frame); nsContainerFrame* parent = nextFrame->GetParent(); nsresult rv = parent->StealFrame(nextFrame); if (NS_FAILED(rv)) { return; } if (parent != this) ReparentFrame(nextFrame, parent, this); mFrames.InsertFrame(nullptr, frame, nextFrame); madeContinuation = true; // needs to be added to mLines nextFrame->RemoveStateBits(NS_FRAME_IS_OVERFLOW_CONTAINER); frameReflowStatus |= NS_FRAME_REFLOW_NEXTINFLOW; } // Push continuation to a new line, but only if we actually made one. if (madeContinuation) { nsLineBox* line = NewLineBox(nextFrame, true); mLines.after_insert(aLine, line); } PushLines(aState, aLine); NS_FRAME_SET_INCOMPLETE(aState.mReflowStatus); // If we need to reflow the continuation of the block child, // then we'd better reflow our continuation if (frameReflowStatus & NS_FRAME_REFLOW_NEXTINFLOW) { aState.mReflowStatus |= NS_FRAME_REFLOW_NEXTINFLOW; // We also need to make that continuation's line dirty so // it gets reflowed when we reflow our next in flow. The // nif's line must always be either a line of the nif's // parent block (only if we didn't make a continuation) or // else one of our own overflow lines. In the latter case // the line is already marked dirty, so just handle the // first case. if (!madeContinuation) { nsBlockFrame* nifBlock = nsLayoutUtils::GetAsBlock(nextFrame->GetParent()); NS_ASSERTION(nifBlock, "A block's child's next in flow's parent must be a block!"); for (LineIterator line = nifBlock->LinesBegin(), line_end = nifBlock->LinesEnd(); line != line_end; ++line) { if (line->Contains(nextFrame)) { line->MarkDirty(); break; } } } } *aKeepReflowGoing = false; // The block-end margin for a block is only applied on the last // flow block. Since we just continued the child block frame, // we know that line->mFirstChild is not the last flow block // therefore zero out the running margin value. #ifdef NOISY_BLOCK_DIR_MARGINS ListTag(stdout); printf(": reflow incomplete, frame="); nsFrame::ListTag(stdout, mFrame); printf(" prevBEndMargin=%d, setting to zero\n", aState.mPrevBEndMargin.get()); #endif aState.mPrevBEndMargin.Zero(); } else { // frame is complete but its overflow is not complete // Disconnect the next-in-flow and put it in our overflow tracker if (!madeContinuation && !(NS_FRAME_IS_OVERFLOW_CONTAINER & nextFrame->GetStateBits())) { // It already exists, but as a normal next-in-flow, so we need // to dig it out of the child lists. nsresult rv = nextFrame->GetParent()->StealFrame(nextFrame); if (NS_FAILED(rv)) { return; } } else if (madeContinuation) { mFrames.RemoveFrame(nextFrame); } // Put it in our overflow list aState.mOverflowTracker->Insert(nextFrame, frameReflowStatus); NS_MergeReflowStatusInto(&aState.mReflowStatus, frameReflowStatus); #ifdef NOISY_BLOCK_DIR_MARGINS ListTag(stdout); printf(": reflow complete but overflow incomplete for "); nsFrame::ListTag(stdout, mFrame); printf(" prevBEndMargin=%d collapsedBEndMargin=%d\n", aState.mPrevBEndMargin.get(), collapsedBEndMargin.get()); #endif aState.mPrevBEndMargin = collapsedBEndMargin; } } else { // frame is fully complete #ifdef NOISY_BLOCK_DIR_MARGINS ListTag(stdout); printf(": reflow complete for "); nsFrame::ListTag(stdout, mFrame); printf(" prevBEndMargin=%d collapsedBEndMargin=%d\n", aState.mPrevBEndMargin.get(), collapsedBEndMargin.get()); #endif aState.mPrevBEndMargin = collapsedBEndMargin; } #ifdef NOISY_BLOCK_DIR_MARGINS ListTag(stdout); printf(": frame="); nsFrame::ListTag(stdout, mFrame); printf(" carriedOutBEndMargin=%d collapsedBEndMargin=%d => %d\n", brc.GetCarriedOutBEndMargin().get(), collapsedBEndMargin.get(), aState.mPrevBEndMargin.get()); #endif } else { if ((aLine == mLines.front() && !GetPrevInFlow()) || ShouldAvoidBreakInside(aState.mReflowInput)) { // If it's our very first line *or* we're not at the top of the page // and we have page-break-inside:avoid, then we need to be pushed to // our parent's next-in-flow. aState.mReflowStatus = NS_INLINE_LINE_BREAK_BEFORE(); } else { // Push the line that didn't fit and any lines that follow it // to our next-in-flow. PushLines(aState, aLine.prev()); NS_FRAME_SET_INCOMPLETE(aState.mReflowStatus); } } } break; // out of the reflow retry loop } // Now that we've got its final position all figured out, position any child // views it may have. Note that the case when frame has a view got handled // by FinishReflowChild, but that function didn't have the coordinates needed // to correctly decide whether to reposition child views. if (originalPosition != frame->GetPosition() && !frame->HasView()) { nsContainerFrame::PositionChildViews(frame); } #ifdef DEBUG VerifyLines(true); #endif } void nsBlockFrame::ReflowInlineFrames(BlockReflowInput& aState, LineIterator aLine, bool* aKeepReflowGoing) { *aKeepReflowGoing = true; aLine->SetLineIsImpactedByFloat(false); // Setup initial coordinate system for reflowing the inline frames // into. Apply a previous block frame's block-end margin first. if (ShouldApplyBStartMargin(aState, aLine, aLine->mFirstChild)) { aState.mBCoord += aState.mPrevBEndMargin.get(); } nsFlowAreaRect floatAvailableSpace = aState.GetFloatAvailableSpace(); LineReflowStatus lineReflowStatus; do { nscoord availableSpaceBSize = 0; aState.mLineBSize.reset(); do { bool allowPullUp = true; nsIFrame* forceBreakInFrame = nullptr; int32_t forceBreakOffset = -1; gfxBreakPriority forceBreakPriority = gfxBreakPriority::eNoBreak; do { nsFloatManager::SavedState floatManagerState; aState.mReflowInput.mFloatManager->PushState(&floatManagerState); // Once upon a time we allocated the first 30 nsLineLayout objects // on the stack, and then we switched to the heap. At that time // these objects were large (1100 bytes on a 32 bit system). // Then the nsLineLayout object was shrunk to 156 bytes by // removing some internal buffers. Given that it is so much // smaller, the complexity of 2 different ways of allocating // no longer makes sense. Now we always allocate on the stack. nsLineLayout lineLayout(aState.mPresContext, aState.mReflowInput.mFloatManager, &aState.mReflowInput, &aLine, nullptr); lineLayout.Init(&aState, aState.mMinLineHeight, aState.mLineNumber); if (forceBreakInFrame) { lineLayout.ForceBreakAtPosition(forceBreakInFrame, forceBreakOffset); } DoReflowInlineFrames(aState, lineLayout, aLine, floatAvailableSpace, availableSpaceBSize, &floatManagerState, aKeepReflowGoing, &lineReflowStatus, allowPullUp); lineLayout.EndLineReflow(); if (LineReflowStatus::RedoNoPull == lineReflowStatus || LineReflowStatus::RedoMoreFloats == lineReflowStatus || LineReflowStatus::RedoNextBand == lineReflowStatus) { if (lineLayout.NeedsBackup()) { NS_ASSERTION(!forceBreakInFrame, "Backing up twice; this should never be necessary"); // If there is no saved break position, then this will set // set forceBreakInFrame to null and we won't back up, which is // correct. forceBreakInFrame = lineLayout.GetLastOptionalBreakPosition(&forceBreakOffset, &forceBreakPriority); } else { forceBreakInFrame = nullptr; } // restore the float manager state aState.mReflowInput.mFloatManager->PopState(&floatManagerState); // Clear out float lists aState.mCurrentLineFloats.DeleteAll(); aState.mBelowCurrentLineFloats.DeleteAll(); } // Don't allow pullup on a subsequent LineReflowStatus::RedoNoPull pass allowPullUp = false; } while (LineReflowStatus::RedoNoPull == lineReflowStatus); } while (LineReflowStatus::RedoMoreFloats == lineReflowStatus); } while (LineReflowStatus::RedoNextBand == lineReflowStatus); } void nsBlockFrame::PushTruncatedLine(BlockReflowInput& aState, LineIterator aLine, bool* aKeepReflowGoing) { PushLines(aState, aLine.prev()); *aKeepReflowGoing = false; NS_FRAME_SET_INCOMPLETE(aState.mReflowStatus); } void nsBlockFrame::DoReflowInlineFrames(BlockReflowInput& aState, nsLineLayout& aLineLayout, LineIterator aLine, nsFlowAreaRect& aFloatAvailableSpace, nscoord& aAvailableSpaceBSize, nsFloatManager::SavedState* aFloatStateBeforeLine, bool* aKeepReflowGoing, LineReflowStatus* aLineReflowStatus, bool aAllowPullUp) { // Forget all of the floats on the line aLine->FreeFloats(aState.mFloatCacheFreeList); aState.mFloatOverflowAreas.Clear(); // We need to set this flag on the line if any of our reflow passes // are impacted by floats. if (aFloatAvailableSpace.mHasFloats) aLine->SetLineIsImpactedByFloat(true); #ifdef REALLY_NOISY_REFLOW printf("nsBlockFrame::DoReflowInlineFrames %p impacted = %d\n", this, aFloatAvailableSpace.mHasFloats); #endif WritingMode outerWM = aState.mReflowInput.GetWritingMode(); WritingMode lineWM = GetWritingMode(aLine->mFirstChild); LogicalRect lineRect = aFloatAvailableSpace.mRect.ConvertTo(lineWM, outerWM, aState.ContainerSize()); nscoord iStart = lineRect.IStart(lineWM); nscoord availISize = lineRect.ISize(lineWM); nscoord availBSize; if (aState.mFlags.mHasUnconstrainedBSize) { availBSize = NS_UNCONSTRAINEDSIZE; } else { /* XXX get the height right! */ availBSize = lineRect.BSize(lineWM); } // Make sure to enable resize optimization before we call BeginLineReflow // because it might get disabled there aLine->EnableResizeReflowOptimization(); aLineLayout.BeginLineReflow(iStart, aState.mBCoord, availISize, availBSize, aFloatAvailableSpace.mHasFloats, false, /*XXX isTopOfPage*/ lineWM, aState.mContainerSize); aState.mFlags.mIsLineLayoutEmpty = false; // XXX Unfortunately we need to know this before reflowing the first // inline frame in the line. FIX ME. if ((0 == aLineLayout.GetLineNumber()) && (NS_BLOCK_HAS_FIRST_LETTER_CHILD & mState) && (NS_BLOCK_HAS_FIRST_LETTER_STYLE & mState)) { aLineLayout.SetFirstLetterStyleOK(true); } NS_ASSERTION(!((NS_BLOCK_HAS_FIRST_LETTER_CHILD & mState) && GetPrevContinuation()), "first letter child bit should only be on first continuation"); // Reflow the frames that are already on the line first LineReflowStatus lineReflowStatus = LineReflowStatus::OK; int32_t i; nsIFrame* frame = aLine->mFirstChild; if (aFloatAvailableSpace.mHasFloats) { // There is a soft break opportunity at the start of the line, because // we can always move this line down below float(s). if (aLineLayout.NotifyOptionalBreakPosition( frame, 0, true, gfxBreakPriority::eNormalBreak)) { lineReflowStatus = LineReflowStatus::RedoNextBand; } } // need to repeatedly call GetChildCount here, because the child // count can change during the loop! for (i = 0; LineReflowStatus::OK == lineReflowStatus && i < aLine->GetChildCount(); i++, frame = frame->GetNextSibling()) { ReflowInlineFrame(aState, aLineLayout, aLine, frame, &lineReflowStatus); if (LineReflowStatus::OK != lineReflowStatus) { // It is possible that one or more of next lines are empty // (because of DeleteNextInFlowChild). If so, delete them now // in case we are finished. ++aLine; while ((aLine != LinesEnd()) && (0 == aLine->GetChildCount())) { // XXX Is this still necessary now that DeleteNextInFlowChild // uses DoRemoveFrame? nsLineBox *toremove = aLine; aLine = mLines.erase(aLine); NS_ASSERTION(nullptr == toremove->mFirstChild, "bad empty line"); FreeLineBox(toremove); } --aLine; NS_ASSERTION(lineReflowStatus != LineReflowStatus::Truncated, "ReflowInlineFrame should never determine that a line " "needs to go to the next page/column"); } } // Don't pull up new frames into lines with continuation placeholders if (aAllowPullUp) { // Pull frames and reflow them until we can't while (LineReflowStatus::OK == lineReflowStatus) { frame = PullFrame(aState, aLine); if (!frame) { break; } while (LineReflowStatus::OK == lineReflowStatus) { int32_t oldCount = aLine->GetChildCount(); ReflowInlineFrame(aState, aLineLayout, aLine, frame, &lineReflowStatus); if (aLine->GetChildCount() != oldCount) { // We just created a continuation for aFrame AND its going // to end up on this line (e.g. :first-letter // situation). Therefore we have to loop here before trying // to pull another frame. frame = frame->GetNextSibling(); } else { break; } } } } aState.mFlags.mIsLineLayoutEmpty = aLineLayout.LineIsEmpty(); // We only need to backup if the line isn't going to be reflowed again anyway bool needsBackup = aLineLayout.NeedsBackup() && (lineReflowStatus == LineReflowStatus::Stop || lineReflowStatus == LineReflowStatus::OK); if (needsBackup && aLineLayout.HaveForcedBreakPosition()) { NS_WARNING("We shouldn't be backing up more than once! " "Someone must have set a break opportunity beyond the available width, " "even though there were better break opportunities before it"); needsBackup = false; } if (needsBackup) { // We need to try backing up to before a text run // XXX It's possible, in fact not unusual, for the break opportunity to already // be the end of the line. We should detect that and optimize to not // re-do the line. if (aLineLayout.HasOptionalBreakPosition()) { // We can back up! lineReflowStatus = LineReflowStatus::RedoNoPull; } } else { // In case we reflow this line again, remember that we don't // need to force any breaking aLineLayout.ClearOptionalBreakPosition(); } if (LineReflowStatus::RedoNextBand == lineReflowStatus) { // This happens only when we have a line that is impacted by // floats and the first element in the line doesn't fit with // the floats. // // What we do is to advance past the first float we find and // then reflow the line all over again. NS_ASSERTION(NS_UNCONSTRAINEDSIZE != aFloatAvailableSpace.mRect.BSize(outerWM), "unconstrained block size on totally empty line"); // See the analogous code for blocks in BlockReflowInput::ClearFloats. if (aFloatAvailableSpace.mRect.BSize(outerWM) > 0) { NS_ASSERTION(aFloatAvailableSpace.mHasFloats, "redo line on totally empty line with non-empty band..."); // We should never hit this case if we've placed floats on the // line; if we have, then the GetFloatAvailableSpace call is wrong // and needs to happen after the caller pops the space manager // state. aState.mFloatManager->AssertStateMatches(aFloatStateBeforeLine); aState.mBCoord += aFloatAvailableSpace.mRect.BSize(outerWM); aFloatAvailableSpace = aState.GetFloatAvailableSpace(); } else { NS_ASSERTION(NS_UNCONSTRAINEDSIZE != aState.mReflowInput.AvailableBSize(), "We shouldn't be running out of height here"); if (NS_UNCONSTRAINEDSIZE == aState.mReflowInput.AvailableBSize()) { // just move it down a bit to try to get out of this mess aState.mBCoord += 1; // We should never hit this case if we've placed floats on the // line; if we have, then the GetFloatAvailableSpace call is wrong // and needs to happen after the caller pops the space manager // state. aState.mFloatManager->AssertStateMatches(aFloatStateBeforeLine); aFloatAvailableSpace = aState.GetFloatAvailableSpace(); } else { // There's nowhere to retry placing the line, so we want to push // it to the next page/column where its contents can fit not // next to a float. lineReflowStatus = LineReflowStatus::Truncated; PushTruncatedLine(aState, aLine, aKeepReflowGoing); } } // XXX: a small optimization can be done here when paginating: // if the new Y coordinate is past the end of the block then // push the line and return now instead of later on after we are // past the float. } else if (LineReflowStatus::Truncated != lineReflowStatus && LineReflowStatus::RedoNoPull != lineReflowStatus) { // If we are propagating out a break-before status then there is // no point in placing the line. if (!NS_INLINE_IS_BREAK_BEFORE(aState.mReflowStatus)) { if (!PlaceLine(aState, aLineLayout, aLine, aFloatStateBeforeLine, aFloatAvailableSpace.mRect, aAvailableSpaceBSize, aKeepReflowGoing)) { lineReflowStatus = LineReflowStatus::RedoMoreFloats; // PlaceLine already called GetAvailableSpaceForBSize for us. } } } #ifdef DEBUG if (gNoisyReflow) { printf("Line reflow status = %s\n", LineReflowStatusToString(lineReflowStatus)); } #endif if (aLineLayout.GetDirtyNextLine()) { // aLine may have been pushed to the overflow lines. FrameLines* overflowLines = GetOverflowLines(); // We can't just compare iterators front() to aLine here, since they may be in // different lists. bool pushedToOverflowLines = overflowLines && overflowLines->mLines.front() == aLine.get(); if (pushedToOverflowLines) { // aLine is stale, it's associated with the main line list but it should // be associated with the overflow line list now aLine = overflowLines->mLines.begin(); } nsBlockInFlowLineIterator iter(this, aLine, pushedToOverflowLines); if (iter.Next() && iter.GetLine()->IsInline()) { iter.GetLine()->MarkDirty(); if (iter.GetContainer() != this) { aState.mReflowStatus |= NS_FRAME_REFLOW_NEXTINFLOW; } } } *aLineReflowStatus = lineReflowStatus; } /** * Reflow an inline frame. The reflow status is mapped from the frames * reflow status to the lines reflow status (not to our reflow status). * The line reflow status is simple: true means keep placing frames * on the line; false means don't (the line is done). If the line * has some sort of breaking affect then aLine's break-type will be set * to something other than StyleClear::None. */ void nsBlockFrame::ReflowInlineFrame(BlockReflowInput& aState, nsLineLayout& aLineLayout, LineIterator aLine, nsIFrame* aFrame, LineReflowStatus* aLineReflowStatus) { if (!aFrame) { // XXX change to MOZ_ASSERT(aFrame) NS_ERROR("why call me?"); return; } *aLineReflowStatus = LineReflowStatus::OK; #ifdef NOISY_FIRST_LETTER ListTag(stdout); printf(": reflowing "); nsFrame::ListTag(stdout, aFrame); printf(" reflowingFirstLetter=%s\n", aLineLayout.GetFirstLetterStyleOK() ? "on" : "off"); #endif // Reflow the inline frame nsReflowStatus frameReflowStatus; bool pushedFrame; aLineLayout.ReflowFrame(aFrame, frameReflowStatus, nullptr, pushedFrame); if (frameReflowStatus & NS_FRAME_REFLOW_NEXTINFLOW) { aLineLayout.SetDirtyNextLine(); } #ifdef REALLY_NOISY_REFLOW nsFrame::ListTag(stdout, aFrame); printf(": status=%x\n", frameReflowStatus); #endif #if defined(REFLOW_STATUS_COVERAGE) RecordReflowStatus(false, frameReflowStatus); #endif // Send post-reflow notification aState.mPrevChild = aFrame; /* XXX This is where we need to add logic to handle some odd behavior. For one thing, we should usually place at least one thing next to a left float, even when that float takes up all the width on a line. see bug 22496 */ // Process the child frames reflow status. There are 5 cases: // complete, not-complete, break-before, break-after-complete, // break-after-not-complete. There are two situations: we are a // block or we are an inline. This makes a total of 10 cases // (fortunately, there is some overlap). aLine->SetBreakTypeAfter(StyleClear::None); if (NS_INLINE_IS_BREAK(frameReflowStatus) || StyleClear::None != aState.mFloatBreakType) { // Always abort the line reflow (because a line break is the // minimal amount of break we do). *aLineReflowStatus = LineReflowStatus::Stop; // XXX what should aLine's break-type be set to in all these cases? StyleClear breakType = NS_INLINE_GET_BREAK_TYPE(frameReflowStatus); MOZ_ASSERT(StyleClear::None != breakType || StyleClear::None != aState.mFloatBreakType, "bad break type"); if (NS_INLINE_IS_BREAK_BEFORE(frameReflowStatus)) { // Break-before cases. if (aFrame == aLine->mFirstChild) { // If we break before the first frame on the line then we must // be trying to place content where there's no room (e.g. on a // line with wide floats). Inform the caller to reflow the // line after skipping past a float. *aLineReflowStatus = LineReflowStatus::RedoNextBand; } else { // It's not the first child on this line so go ahead and split // the line. We will see the frame again on the next-line. SplitLine(aState, aLineLayout, aLine, aFrame, aLineReflowStatus); // If we're splitting the line because the frame didn't fit and it // was pushed, then mark the line as having word wrapped. We need to // know that if we're shrink wrapping our width if (pushedFrame) { aLine->SetLineWrapped(true); } } } else { // If a float split and its prev-in-flow was followed by a
    , then combine // the
    's break type with the inline's break type (the inline will be the very // next frame after the split float). if (StyleClear::None != aState.mFloatBreakType) { breakType = nsLayoutUtils::CombineBreakType(breakType, aState.mFloatBreakType); aState.mFloatBreakType = StyleClear::None; } // Break-after cases if (breakType == StyleClear::Line) { if (!aLineLayout.GetLineEndsInBR()) { breakType = StyleClear::None; } } aLine->SetBreakTypeAfter(breakType); if (NS_FRAME_IS_COMPLETE(frameReflowStatus)) { // Split line, but after the frame just reflowed SplitLine(aState, aLineLayout, aLine, aFrame->GetNextSibling(), aLineReflowStatus); if (NS_INLINE_IS_BREAK_AFTER(frameReflowStatus) && !aLineLayout.GetLineEndsInBR()) { aLineLayout.SetDirtyNextLine(); } } } } if (!NS_FRAME_IS_FULLY_COMPLETE(frameReflowStatus)) { // Create a continuation for the incomplete frame. Note that the // frame may already have a continuation. CreateContinuationFor(aState, aLine, aFrame); // Remember that the line has wrapped if (!aLineLayout.GetLineEndsInBR()) { aLine->SetLineWrapped(true); } // If we just ended a first-letter frame or reflowed a placeholder then // don't split the line and don't stop the line reflow... // But if we are going to stop anyways we'd better split the line. if ((!(frameReflowStatus & NS_INLINE_BREAK_FIRST_LETTER_COMPLETE) && nsGkAtoms::placeholderFrame != aFrame->GetType()) || *aLineReflowStatus == LineReflowStatus::Stop) { // Split line after the current frame *aLineReflowStatus = LineReflowStatus::Stop; SplitLine(aState, aLineLayout, aLine, aFrame->GetNextSibling(), aLineReflowStatus); } } } bool nsBlockFrame::CreateContinuationFor(BlockReflowInput& aState, nsLineBox* aLine, nsIFrame* aFrame) { nsIFrame* newFrame = nullptr; if (!aFrame->GetNextInFlow()) { newFrame = aState.mPresContext->PresShell()->FrameConstructor()-> CreateContinuingFrame(aState.mPresContext, aFrame, this); mFrames.InsertFrame(nullptr, aFrame, newFrame); if (aLine) { aLine->NoteFrameAdded(newFrame); } } #ifdef DEBUG VerifyLines(false); #endif return !!newFrame; } nsresult nsBlockFrame::SplitFloat(BlockReflowInput& aState, nsIFrame* aFloat, nsReflowStatus aFloatStatus) { MOZ_ASSERT(!NS_FRAME_IS_FULLY_COMPLETE(aFloatStatus), "why split the frame if it's fully complete?"); MOZ_ASSERT(aState.mBlock == this); nsIFrame* nextInFlow = aFloat->GetNextInFlow(); if (nextInFlow) { nsContainerFrame *oldParent = nextInFlow->GetParent(); DebugOnly rv = oldParent->StealFrame(nextInFlow); NS_ASSERTION(NS_SUCCEEDED(rv), "StealFrame failed"); if (oldParent != this) { ReparentFrame(nextInFlow, oldParent, this); } if (!NS_FRAME_OVERFLOW_IS_INCOMPLETE(aFloatStatus)) { nextInFlow->RemoveStateBits(NS_FRAME_IS_OVERFLOW_CONTAINER); } } else { nextInFlow = aState.mPresContext->PresShell()->FrameConstructor()-> CreateContinuingFrame(aState.mPresContext, aFloat, this); } if (NS_FRAME_OVERFLOW_IS_INCOMPLETE(aFloatStatus)) { nextInFlow->AddStateBits(NS_FRAME_IS_OVERFLOW_CONTAINER); } StyleFloat floatStyle = aFloat->StyleDisplay()->PhysicalFloats(aState.mReflowInput.GetWritingMode()); if (floatStyle == StyleFloat::Left) { aState.mFloatManager->SetSplitLeftFloatAcrossBreak(); } else { MOZ_ASSERT(floatStyle == StyleFloat::Right, "Unexpected float side!"); aState.mFloatManager->SetSplitRightFloatAcrossBreak(); } aState.AppendPushedFloatChain(nextInFlow); NS_FRAME_SET_OVERFLOW_INCOMPLETE(aState.mReflowStatus); return NS_OK; } static nsFloatCache* GetLastFloat(nsLineBox* aLine) { nsFloatCache* fc = aLine->GetFirstFloat(); while (fc && fc->Next()) { fc = fc->Next(); } return fc; } static bool CheckPlaceholderInLine(nsIFrame* aBlock, nsLineBox* aLine, nsFloatCache* aFC) { if (!aFC) return true; NS_ASSERTION(!aFC->mFloat->GetPrevContinuation(), "float in a line should never be a continuation"); NS_ASSERTION(!(aFC->mFloat->GetStateBits() & NS_FRAME_IS_PUSHED_FLOAT), "float in a line should never be a pushed float"); nsIFrame* ph = aFC->mFloat->FirstInFlow()->GetPlaceholderFrame(); for (nsIFrame* f = ph; f; f = f->GetParent()) { if (f->GetParent() == aBlock) return aLine->Contains(f); } NS_ASSERTION(false, "aBlock is not an ancestor of aFrame!"); return true; } void nsBlockFrame::SplitLine(BlockReflowInput& aState, nsLineLayout& aLineLayout, LineIterator aLine, nsIFrame* aFrame, LineReflowStatus* aLineReflowStatus) { MOZ_ASSERT(aLine->IsInline(), "illegal SplitLine on block line"); int32_t pushCount = aLine->GetChildCount() - aLineLayout.GetCurrentSpanCount(); MOZ_ASSERT(pushCount >= 0, "bad push count"); #ifdef DEBUG if (gNoisyReflow) { nsFrame::IndentBy(stdout, gNoiseIndent); printf("split line: from line=%p pushCount=%d aFrame=", static_cast(aLine.get()), pushCount); if (aFrame) { nsFrame::ListTag(stdout, aFrame); } else { printf("(null)"); } printf("\n"); if (gReallyNoisyReflow) { aLine->List(stdout, gNoiseIndent+1); } } #endif if (0 != pushCount) { MOZ_ASSERT(aLine->GetChildCount() > pushCount, "bad push"); MOZ_ASSERT(nullptr != aFrame, "whoops"); #ifdef DEBUG { nsIFrame *f = aFrame; int32_t count = pushCount; while (f && count > 0) { f = f->GetNextSibling(); --count; } NS_ASSERTION(count == 0, "Not enough frames to push"); } #endif // Put frames being split out into their own line nsLineBox* newLine = NewLineBox(aLine, aFrame, pushCount); mLines.after_insert(aLine, newLine); #ifdef DEBUG if (gReallyNoisyReflow) { newLine->List(stdout, gNoiseIndent+1); } #endif // Let line layout know that some frames are no longer part of its // state. aLineLayout.SplitLineTo(aLine->GetChildCount()); // If floats have been placed whose placeholders have been pushed to the new // line, we need to reflow the old line again. We don't want to look at the // frames in the new line, because as a large paragraph is laid out the // we'd get O(N^2) performance. So instead we just check that the last // float and the last below-current-line float are still in aLine. if (!CheckPlaceholderInLine(this, aLine, GetLastFloat(aLine)) || !CheckPlaceholderInLine(this, aLine, aState.mBelowCurrentLineFloats.Tail())) { *aLineReflowStatus = LineReflowStatus::RedoNoPull; } #ifdef DEBUG VerifyLines(true); #endif } } bool nsBlockFrame::IsLastLine(BlockReflowInput& aState, LineIterator aLine) { while (++aLine != LinesEnd()) { // There is another line if (0 != aLine->GetChildCount()) { // If the next line is a block line then this line is the last in a // group of inline lines. return aLine->IsBlock(); } // The next line is empty, try the next one } // XXX Not sure about this part // Try our next-in-flows lines to answer the question nsBlockFrame* nextInFlow = (nsBlockFrame*) GetNextInFlow(); while (nullptr != nextInFlow) { for (LineIterator line = nextInFlow->LinesBegin(), line_end = nextInFlow->LinesEnd(); line != line_end; ++line) { if (0 != line->GetChildCount()) return line->IsBlock(); } nextInFlow = (nsBlockFrame*) nextInFlow->GetNextInFlow(); } // This is the last line - so don't allow justification return true; } bool nsBlockFrame::PlaceLine(BlockReflowInput& aState, nsLineLayout& aLineLayout, LineIterator aLine, nsFloatManager::SavedState *aFloatStateBeforeLine, LogicalRect& aFloatAvailableSpace, nscoord& aAvailableSpaceBSize, bool* aKeepReflowGoing) { // Trim extra white-space from the line before placing the frames aLineLayout.TrimTrailingWhiteSpace(); // Vertically align the frames on this line. // // 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: when the first line is empty. WritingMode wm = aState.mReflowInput.GetWritingMode(); bool addedBullet = false; if (HasOutsideBullet() && ((aLine == mLines.front() && (!aLineLayout.IsZeroBSize() || (aLine == mLines.back()))) || (mLines.front() != mLines.back() && 0 == mLines.front()->BSize() && aLine == mLines.begin().next()))) { ReflowOutput metrics(aState.mReflowInput); nsIFrame* bullet = GetOutsideBullet(); ReflowBullet(bullet, aState, metrics, aState.mBCoord); NS_ASSERTION(!BulletIsEmpty() || metrics.BSize(wm) == 0, "empty bullet took up space"); aLineLayout.AddBulletFrame(bullet, metrics); addedBullet = true; } aLineLayout.VerticalAlignLine(); // We want to consider the floats in the current line when determining // whether the float available space is shrunk. If mLineBSize doesn't // exist, we are in the first pass trying to place the line. Calling // GetFloatAvailableSpace() like we did in BlockReflowInput::AddFloat() // for UpdateBand(). // floatAvailableSpaceWithOldLineBSize is the float available space with // the old BSize, but including the floats that were added in this line. LogicalRect floatAvailableSpaceWithOldLineBSize = aState.mLineBSize.isNothing() ? aState.GetFloatAvailableSpace(aLine->BStart()).mRect : aState.GetFloatAvailableSpaceForBSize(aLine->BStart(), aState.mLineBSize.value(), nullptr).mRect; // As we redo for floats, we can't reduce the amount of BSize we're // checking. aAvailableSpaceBSize = std::max(aAvailableSpaceBSize, aLine->BSize()); LogicalRect floatAvailableSpaceWithLineBSize = aState.GetFloatAvailableSpaceForBSize(aLine->BStart(), aAvailableSpaceBSize, nullptr).mRect; // If the available space between the floats is smaller now that we // know the BSize, return false (and cause another pass with // LineReflowStatus::RedoMoreFloats). We ensure aAvailableSpaceBSize // never decreases, which means that we can't reduce the set of floats // we intersect, which means that the available space cannot grow. if (AvailableSpaceShrunk(wm, floatAvailableSpaceWithOldLineBSize, floatAvailableSpaceWithLineBSize, false)) { // Prepare data for redoing the line. aState.mLineBSize = Some(aLine->BSize()); // Since we want to redo the line, we update aFloatAvailableSpace by // using the aFloatStateBeforeLine, which is the float manager's state // before the line is placed. LogicalRect oldFloatAvailableSpace(aFloatAvailableSpace); aFloatAvailableSpace = aState.GetFloatAvailableSpaceForBSize(aLine->BStart(), aAvailableSpaceBSize, aFloatStateBeforeLine).mRect; NS_ASSERTION(aFloatAvailableSpace.BStart(wm) == oldFloatAvailableSpace.BStart(wm), "yikes"); // Restore the BSize to the position of the next band. aFloatAvailableSpace.BSize(wm) = oldFloatAvailableSpace.BSize(wm); // Enforce both IStart() and IEnd() never move outwards to prevent // infinite grow-shrink loops. const nscoord iStartDiff = aFloatAvailableSpace.IStart(wm) - oldFloatAvailableSpace.IStart(wm); const nscoord iEndDiff = aFloatAvailableSpace.IEnd(wm) - oldFloatAvailableSpace.IEnd(wm); if (iStartDiff < 0) { aFloatAvailableSpace.IStart(wm) -= iStartDiff; aFloatAvailableSpace.ISize(wm) += iStartDiff; } if (iEndDiff > 0) { aFloatAvailableSpace.ISize(wm) -= iEndDiff; } return false; } #ifdef DEBUG if (!GetParent()->IsCrazySizeAssertSuppressed()) { static nscoord lastHeight = 0; if (CRAZY_SIZE(aLine->BStart())) { lastHeight = aLine->BStart(); if (abs(aLine->BStart() - lastHeight) > CRAZY_COORD/10) { nsFrame::ListTag(stdout); printf(": line=%p y=%d line.bounds.height=%d\n", static_cast(aLine.get()), aLine->BStart(), aLine->BSize()); } } else { lastHeight = 0; } } #endif // Only block frames horizontally align their children because // inline frames "shrink-wrap" around their children (therefore // there is no extra horizontal space). const nsStyleText* styleText = StyleText(); /** * text-align-last defaults to the same value as text-align when * text-align-last is set to auto (except when text-align is set to justify), * so in that case we don't need to set isLastLine. * * In other words, isLastLine really means isLastLineAndWeCare. */ bool isLastLine = !IsSVGText() && ((NS_STYLE_TEXT_ALIGN_AUTO != styleText->mTextAlignLast || NS_STYLE_TEXT_ALIGN_JUSTIFY == styleText->mTextAlign) && (aLineLayout.GetLineEndsInBR() || IsLastLine(aState, aLine))); aLineLayout.TextAlignLine(aLine, isLastLine); // From here on, pfd->mBounds rectangles are incorrect because bidi // might have moved frames around! nsOverflowAreas overflowAreas; aLineLayout.RelativePositionFrames(overflowAreas); aLine->SetOverflowAreas(overflowAreas); if (addedBullet) { aLineLayout.RemoveBulletFrame(GetOutsideBullet()); } // Inline lines do not have margins themselves; however they are // impacted by prior block margins. If this line ends up having some // height then we zero out the previous block-end margin value that was // already applied to the line's starting Y coordinate. Otherwise we // leave it be so that the previous blocks block-end margin can be // collapsed with a block that follows. nscoord newBCoord; if (!aLine->CachedIsEmpty()) { // This line has some height. Therefore the application of the // previous-bottom-margin should stick. aState.mPrevBEndMargin.Zero(); newBCoord = aLine->BEnd(); } else { // Don't let the previous-bottom-margin value affect the newBCoord // coordinate (it was applied in ReflowInlineFrames speculatively) // since the line is empty. // We already called |ShouldApplyBStartMargin|, and if we applied it // then mShouldApplyBStartMargin is set. nscoord dy = aState.mFlags.mShouldApplyBStartMargin ? -aState.mPrevBEndMargin.get() : 0; newBCoord = aState.mBCoord + dy; } if (!NS_FRAME_IS_FULLY_COMPLETE(aState.mReflowStatus) && ShouldAvoidBreakInside(aState.mReflowInput)) { aLine->AppendFloats(aState.mCurrentLineFloats); aState.mReflowStatus = NS_INLINE_LINE_BREAK_BEFORE(); return true; } // See if the line fit (our first line always does). if (mLines.front() != aLine && newBCoord > aState.mBEndEdge && aState.mBEndEdge != NS_UNCONSTRAINEDSIZE) { NS_ASSERTION(aState.mCurrentLine == aLine, "oops"); if (ShouldAvoidBreakInside(aState.mReflowInput)) { // All our content doesn't fit, start on the next page. aState.mReflowStatus = NS_INLINE_LINE_BREAK_BEFORE(); } else { // Push aLine and all of its children and anything else that // follows to our next-in-flow. PushTruncatedLine(aState, aLine, aKeepReflowGoing); } return true; } aState.mBCoord = newBCoord; // Add the already placed current-line floats to the line aLine->AppendFloats(aState.mCurrentLineFloats); // Any below current line floats to place? if (aState.mBelowCurrentLineFloats.NotEmpty()) { // Reflow the below-current-line floats, which places on the line's // float list. aState.PlaceBelowCurrentLineFloats(aState.mBelowCurrentLineFloats, aLine); aLine->AppendFloats(aState.mBelowCurrentLineFloats); } // When a line has floats, factor them into the combined-area // computations. if (aLine->HasFloats()) { // Combine the float combined area (stored in aState) and the // value computed by the line layout code. nsOverflowAreas lineOverflowAreas; NS_FOR_FRAME_OVERFLOW_TYPES(otype) { nsRect &o = lineOverflowAreas.Overflow(otype); o = aLine->GetOverflowArea(otype); #ifdef NOISY_COMBINED_AREA ListTag(stdout); printf(": overflow %d lineCA=%d,%d,%d,%d floatCA=%d,%d,%d,%d\n", otype, o.x, o.y, o.width, o.height, aState.mFloatOverflowAreas.Overflow(otype).x, aState.mFloatOverflowAreas.Overflow(otype).y, aState.mFloatOverflowAreas.Overflow(otype).width, aState.mFloatOverflowAreas.Overflow(otype).height); #endif o.UnionRect(aState.mFloatOverflowAreas.Overflow(otype), o); #ifdef NOISY_COMBINED_AREA printf(" ==> final lineCA=%d,%d,%d,%d\n", o.x, o.y, o.width, o.height); #endif } aLine->SetOverflowAreas(lineOverflowAreas); } // Apply break-after clearing if necessary // This must stay in sync with |ReflowDirtyLines|. if (aLine->HasFloatBreakAfter()) { aState.mBCoord = aState.ClearFloats(aState.mBCoord, aLine->GetBreakTypeAfter()); } return true; } void nsBlockFrame::PushLines(BlockReflowInput& aState, nsLineList::iterator aLineBefore) { // NOTE: aLineBefore is always a normal line, not an overflow line. // The following expression will assert otherwise. DebugOnly check = aLineBefore == mLines.begin(); nsLineList::iterator overBegin(aLineBefore.next()); // PushTruncatedPlaceholderLine sometimes pushes the first line. Ugh. bool firstLine = overBegin == LinesBegin(); if (overBegin != LinesEnd()) { // Remove floats in the lines from mFloats nsFrameList floats; CollectFloats(overBegin->mFirstChild, floats, true); if (floats.NotEmpty()) { #ifdef DEBUG for (nsIFrame* f : floats) { MOZ_ASSERT(!(f->GetStateBits() & NS_FRAME_IS_PUSHED_FLOAT), "CollectFloats should've removed that bit"); } #endif // Push the floats onto the front of the overflow out-of-flows list nsAutoOOFFrameList oofs(this); oofs.mList.InsertFrames(nullptr, nullptr, floats); } // overflow lines can already exist in some cases, in particular, // when shrinkwrapping and we discover that the shrinkwap causes // the height of some child block to grow which creates additional // overflowing content. In such cases we must prepend the new // overflow to the existing overflow. FrameLines* overflowLines = RemoveOverflowLines(); if (!overflowLines) { // XXXldb use presshell arena! overflowLines = new FrameLines(); } if (overflowLines) { nsIFrame* lineBeforeLastFrame; if (firstLine) { lineBeforeLastFrame = nullptr; // removes all frames } else { nsIFrame* f = overBegin->mFirstChild; lineBeforeLastFrame = f ? f->GetPrevSibling() : mFrames.LastChild(); NS_ASSERTION(!f || lineBeforeLastFrame == aLineBefore->LastChild(), "unexpected line frames"); } nsFrameList pushedFrames = mFrames.RemoveFramesAfter(lineBeforeLastFrame); overflowLines->mFrames.InsertFrames(nullptr, nullptr, pushedFrames); overflowLines->mLines.splice(overflowLines->mLines.begin(), mLines, overBegin, LinesEnd()); NS_ASSERTION(!overflowLines->mLines.empty(), "should not be empty"); // this takes ownership but it won't delete it immediately so we // can keep using it. SetOverflowLines(overflowLines); // Mark all the overflow lines dirty so that they get reflowed when // they are pulled up by our next-in-flow. // XXXldb Can this get called O(N) times making the whole thing O(N^2)? for (LineIterator line = overflowLines->mLines.begin(), line_end = overflowLines->mLines.end(); line != line_end; ++line) { line->MarkDirty(); line->MarkPreviousMarginDirty(); line->SetBoundsEmpty(); if (line->HasFloats()) { line->FreeFloats(aState.mFloatCacheFreeList); } } } } #ifdef DEBUG VerifyOverflowSituation(); #endif } // The overflowLines property is stored as a pointer to a line list, // which must be deleted. However, the following functions all maintain // the invariant that the property is never set if the list is empty. bool nsBlockFrame::DrainOverflowLines() { #ifdef DEBUG VerifyOverflowSituation(); #endif // Steal the prev-in-flow's overflow lines and prepend them. bool didFindOverflow = false; nsBlockFrame* prevBlock = static_cast(GetPrevInFlow()); if (prevBlock) { prevBlock->ClearLineCursor(); FrameLines* overflowLines = prevBlock->RemoveOverflowLines(); if (overflowLines) { // Make all the frames on the overflow line list mine. ReparentFrames(overflowLines->mFrames, prevBlock, this); // Make the overflow out-of-flow frames mine too. nsAutoOOFFrameList oofs(prevBlock); if (oofs.mList.NotEmpty()) { // In case we own a next-in-flow of any of the drained frames, then // those are now not PUSHED_FLOATs anymore. for (nsFrameList::Enumerator e(oofs.mList); !e.AtEnd(); e.Next()) { nsIFrame* nif = e.get()->GetNextInFlow(); for (; nif && nif->GetParent() == this; nif = nif->GetNextInFlow()) { MOZ_ASSERT(mFloats.ContainsFrame(nif)); nif->RemoveStateBits(NS_FRAME_IS_PUSHED_FLOAT); } } ReparentFrames(oofs.mList, prevBlock, this); mFloats.InsertFrames(nullptr, nullptr, oofs.mList); } if (!mLines.empty()) { // Remember to recompute the margins on the first line. This will // also recompute the correct deltaBCoord if necessary. mLines.front()->MarkPreviousMarginDirty(); } // The overflow lines have already been marked dirty and their previous // margins marked dirty also. // Prepend the overflow frames/lines to our principal list. mFrames.InsertFrames(nullptr, nullptr, overflowLines->mFrames); mLines.splice(mLines.begin(), overflowLines->mLines); NS_ASSERTION(overflowLines->mLines.empty(), "splice should empty list"); delete overflowLines; didFindOverflow = true; } } // Now append our own overflow lines. return DrainSelfOverflowList() || didFindOverflow; } bool nsBlockFrame::DrainSelfOverflowList() { UniquePtr ourOverflowLines(RemoveOverflowLines()); if (!ourOverflowLines) { return false; } // No need to reparent frames in our own overflow lines/oofs, because they're // already ours. But we should put overflow floats back in mFloats. // (explicit scope to remove the OOF list before VerifyOverflowSituation) { nsAutoOOFFrameList oofs(this); if (oofs.mList.NotEmpty()) { #ifdef DEBUG for (nsIFrame* f : oofs.mList) { MOZ_ASSERT(!(f->GetStateBits() & NS_FRAME_IS_PUSHED_FLOAT), "CollectFloats should've removed that bit"); } #endif // The overflow floats go after our regular floats. mFloats.AppendFrames(nullptr, oofs.mList); } } if (!ourOverflowLines->mLines.empty()) { mFrames.AppendFrames(nullptr, ourOverflowLines->mFrames); mLines.splice(mLines.end(), ourOverflowLines->mLines); } #ifdef DEBUG VerifyOverflowSituation(); #endif return true; } /** * Pushed floats are floats whose placeholders are in a previous * continuation. They might themselves be next-continuations of a float * that partially fit in an earlier continuation, or they might be the * first continuation of a float that couldn't be placed at all. * * Pushed floats live permanently at the beginning of a block's float * list, where they must live *before* any floats whose placeholders are * in that block. * * Temporarily, during reflow, they also live on the pushed floats list, * which only holds them between (a) when one continuation pushes them to * its pushed floats list because they don't fit and (b) when the next * continuation pulls them onto the beginning of its float list. * * DrainPushedFloats sets up pushed floats the way we need them at the * start of reflow; they are then reflowed by ReflowPushedFloats (which * might push some of them on). Floats with placeholders in this block * are reflowed by (BlockReflowInput/nsLineLayout)::AddFloat, which * also maintains these invariants. * * DrainSelfPushedFloats moves any pushed floats from this block's own * PushedFloats list back into mFloats. DrainPushedFloats additionally * moves frames from its prev-in-flow's PushedFloats list into mFloats. */ void nsBlockFrame::DrainSelfPushedFloats() { // If we're getting reflowed multiple times without our // next-continuation being reflowed, we might need to pull back floats // that we just put in the list to be pushed to our next-in-flow. // We don't want to pull back any next-in-flows of floats on our own // float list, and we only need to pull back first-in-flows whose // placeholders were in earlier blocks (since first-in-flows whose // placeholders are in this block will get pulled appropriately by // AddFloat, and will then be more likely to be in the correct order). // FIXME: What if there's a continuation in our pushed floats list // whose prev-in-flow is in a previous continuation of this block // rather than this block? Might we need to pull it back so we don't // report ourselves complete? // FIXME: Maybe we should just pull all of them back? nsPresContext* presContext = PresContext(); nsFrameList* ourPushedFloats = GetPushedFloats(); if (ourPushedFloats) { // When we pull back floats, we want to put them with the pushed // floats, which must live at the start of our float list, but we // want them at the end of those pushed floats. // FIXME: This isn't quite right! What if they're all pushed floats? nsIFrame *insertionPrevSibling = nullptr; /* beginning of list */ for (nsIFrame* f = mFloats.FirstChild(); f && (f->GetStateBits() & NS_FRAME_IS_PUSHED_FLOAT); f = f->GetNextSibling()) { insertionPrevSibling = f; } for (nsIFrame *f = ourPushedFloats->LastChild(), *next; f; f = next) { next = f->GetPrevSibling(); if (f->GetPrevContinuation()) { // FIXME } else { nsPlaceholderFrame* placeholder = f->GetPlaceholderFrame(); nsIFrame* floatOriginalParent = presContext->PresShell()-> FrameConstructor()->GetFloatContainingBlock(placeholder); if (floatOriginalParent != this) { // This is a first continuation that was pushed from one of our // previous continuations. Take it out of the pushed floats // list and put it in our floats list, before any of our // floats, but after other pushed floats. ourPushedFloats->RemoveFrame(f); mFloats.InsertFrame(nullptr, insertionPrevSibling, f); } } } if (ourPushedFloats->IsEmpty()) { RemovePushedFloats()->Delete(presContext->PresShell()); } } } void nsBlockFrame::DrainPushedFloats() { DrainSelfPushedFloats(); // After our prev-in-flow has completed reflow, it may have a pushed // floats list, containing floats that we need to own. Take these. nsBlockFrame* prevBlock = static_cast(GetPrevInFlow()); if (prevBlock) { AutoFrameListPtr list(PresContext(), prevBlock->RemovePushedFloats()); if (list && list->NotEmpty()) { mFloats.InsertFrames(this, nullptr, *list); } } } nsBlockFrame::FrameLines* nsBlockFrame::GetOverflowLines() const { if (!HasOverflowLines()) { return nullptr; } FrameLines* prop = GetProperty(OverflowLinesProperty()); NS_ASSERTION(prop && !prop->mLines.empty() && prop->mLines.front()->GetChildCount() == 0 ? prop->mFrames.IsEmpty() : prop->mLines.front()->mFirstChild == prop->mFrames.FirstChild(), "value should always be stored and non-empty when state set"); return prop; } nsBlockFrame::FrameLines* nsBlockFrame::RemoveOverflowLines() { if (!HasOverflowLines()) { return nullptr; } FrameLines* prop = RemoveProperty(OverflowLinesProperty()); NS_ASSERTION(prop && !prop->mLines.empty() && prop->mLines.front()->GetChildCount() == 0 ? prop->mFrames.IsEmpty() : prop->mLines.front()->mFirstChild == prop->mFrames.FirstChild(), "value should always be stored and non-empty when state set"); RemoveStateBits(NS_BLOCK_HAS_OVERFLOW_LINES); return prop; } void nsBlockFrame::DestroyOverflowLines() { NS_ASSERTION(HasOverflowLines(), "huh?"); FrameLines* prop = RemoveProperty(OverflowLinesProperty()); NS_ASSERTION(prop && prop->mLines.empty(), "value should always be stored but empty when destroying"); RemoveStateBits(NS_BLOCK_HAS_OVERFLOW_LINES); delete prop; } // This takes ownership of aOverflowLines. // XXX We should allocate overflowLines from presShell arena! void nsBlockFrame::SetOverflowLines(FrameLines* aOverflowLines) { NS_ASSERTION(aOverflowLines, "null lines"); NS_ASSERTION(!aOverflowLines->mLines.empty(), "empty lines"); NS_ASSERTION(aOverflowLines->mLines.front()->mFirstChild == aOverflowLines->mFrames.FirstChild(), "invalid overflow lines / frames"); NS_ASSERTION(!(GetStateBits() & NS_BLOCK_HAS_OVERFLOW_LINES), "Overwriting existing overflow lines"); // Verify that we won't overwrite an existing overflow list NS_ASSERTION(!GetProperty(OverflowLinesProperty()), "existing overflow list"); SetProperty(OverflowLinesProperty(), aOverflowLines); AddStateBits(NS_BLOCK_HAS_OVERFLOW_LINES); } nsFrameList* nsBlockFrame::GetOverflowOutOfFlows() const { if (!(GetStateBits() & NS_BLOCK_HAS_OVERFLOW_OUT_OF_FLOWS)) { return nullptr; } nsFrameList* result = GetPropTableFrames(OverflowOutOfFlowsProperty()); NS_ASSERTION(result, "value should always be non-empty when state set"); return result; } // This takes ownership of the frames void nsBlockFrame::SetOverflowOutOfFlows(const nsFrameList& aList, nsFrameList* aPropValue) { NS_PRECONDITION(!!(GetStateBits() & NS_BLOCK_HAS_OVERFLOW_OUT_OF_FLOWS) == !!aPropValue, "state does not match value"); if (aList.IsEmpty()) { if (!(GetStateBits() & NS_BLOCK_HAS_OVERFLOW_OUT_OF_FLOWS)) { return; } nsFrameList* list = RemovePropTableFrames(OverflowOutOfFlowsProperty()); NS_ASSERTION(aPropValue == list, "prop value mismatch"); list->Clear(); list->Delete(PresContext()->PresShell()); RemoveStateBits(NS_BLOCK_HAS_OVERFLOW_OUT_OF_FLOWS); } else if (GetStateBits() & NS_BLOCK_HAS_OVERFLOW_OUT_OF_FLOWS) { NS_ASSERTION(aPropValue == GetPropTableFrames(OverflowOutOfFlowsProperty()), "prop value mismatch"); *aPropValue = aList; } else { SetPropTableFrames(new (PresContext()->PresShell()) nsFrameList(aList), OverflowOutOfFlowsProperty()); AddStateBits(NS_BLOCK_HAS_OVERFLOW_OUT_OF_FLOWS); } } nsBulletFrame* nsBlockFrame::GetInsideBullet() const { if (!HasInsideBullet()) { return nullptr; } NS_ASSERTION(!HasOutsideBullet(), "invalid bullet state"); nsBulletFrame* frame = GetProperty(InsideBulletProperty()); NS_ASSERTION(frame && frame->GetType() == nsGkAtoms::bulletFrame, "bogus inside bullet frame"); return frame; } nsBulletFrame* nsBlockFrame::GetOutsideBullet() const { nsFrameList* list = GetOutsideBulletList(); return list ? static_cast(list->FirstChild()) : nullptr; } nsFrameList* nsBlockFrame::GetOutsideBulletList() const { if (!HasOutsideBullet()) { return nullptr; } NS_ASSERTION(!HasInsideBullet(), "invalid bullet state"); nsFrameList* list = GetProperty(OutsideBulletProperty()); NS_ASSERTION(list && list->GetLength() == 1 && list->FirstChild()->GetType() == nsGkAtoms::bulletFrame, "bogus outside bullet list"); return list; } nsFrameList* nsBlockFrame::GetPushedFloats() const { if (!HasPushedFloats()) { return nullptr; } nsFrameList* result = GetProperty(PushedFloatProperty()); NS_ASSERTION(result, "value should always be non-empty when state set"); return result; } nsFrameList* nsBlockFrame::EnsurePushedFloats() { nsFrameList *result = GetPushedFloats(); if (result) return result; result = new (PresContext()->PresShell()) nsFrameList; SetProperty(PushedFloatProperty(), result); AddStateBits(NS_BLOCK_HAS_PUSHED_FLOATS); return result; } nsFrameList* nsBlockFrame::RemovePushedFloats() { if (!HasPushedFloats()) { return nullptr; } nsFrameList *result = RemoveProperty(PushedFloatProperty()); RemoveStateBits(NS_BLOCK_HAS_PUSHED_FLOATS); NS_ASSERTION(result, "value should always be non-empty when state set"); return result; } ////////////////////////////////////////////////////////////////////// // Frame list manipulation routines void nsBlockFrame::AppendFrames(ChildListID aListID, nsFrameList& aFrameList) { if (aFrameList.IsEmpty()) { return; } if (aListID != kPrincipalList) { if (kFloatList == aListID) { DrainSelfPushedFloats(); // ensure the last frame is in mFloats mFloats.AppendFrames(nullptr, aFrameList); return; } MOZ_ASSERT(kNoReflowPrincipalList == aListID, "unexpected child list"); } // Find the proper last-child for where the append should go nsIFrame* lastKid = mFrames.LastChild(); NS_ASSERTION((mLines.empty() ? nullptr : mLines.back()->LastChild()) == lastKid, "out-of-sync mLines / mFrames"); #ifdef NOISY_REFLOW_REASON ListTag(stdout); printf(": append "); nsFrame::ListTag(stdout, aFrameList); if (lastKid) { printf(" after "); nsFrame::ListTag(stdout, lastKid); } printf("\n"); #endif AddFrames(aFrameList, lastKid); if (aListID != kNoReflowPrincipalList) { PresContext()->PresShell()-> FrameNeedsReflow(this, nsIPresShell::eTreeChange, NS_FRAME_HAS_DIRTY_CHILDREN); // XXX sufficient? } } void nsBlockFrame::InsertFrames(ChildListID aListID, nsIFrame* aPrevFrame, nsFrameList& aFrameList) { NS_ASSERTION(!aPrevFrame || aPrevFrame->GetParent() == this, "inserting after sibling frame with different parent"); if (aListID != kPrincipalList) { if (kFloatList == aListID) { DrainSelfPushedFloats(); // ensure aPrevFrame is in mFloats mFloats.InsertFrames(this, aPrevFrame, aFrameList); return; } MOZ_ASSERT(kNoReflowPrincipalList == aListID, "unexpected child list"); } #ifdef NOISY_REFLOW_REASON ListTag(stdout); printf(": insert "); nsFrame::ListTag(stdout, aFrameList); if (aPrevFrame) { printf(" after "); nsFrame::ListTag(stdout, aPrevFrame); } printf("\n"); #endif AddFrames(aFrameList, aPrevFrame); if (aListID != kNoReflowPrincipalList) { PresContext()->PresShell()-> FrameNeedsReflow(this, nsIPresShell::eTreeChange, NS_FRAME_HAS_DIRTY_CHILDREN); // XXX sufficient? } } void nsBlockFrame::RemoveFrame(ChildListID aListID, nsIFrame* aOldFrame) { #ifdef NOISY_REFLOW_REASON ListTag(stdout); printf(": remove "); nsFrame::ListTag(stdout, aOldFrame); printf("\n"); #endif if (aListID == kPrincipalList) { bool hasFloats = BlockHasAnyFloats(aOldFrame); DoRemoveFrame(aOldFrame, REMOVE_FIXED_CONTINUATIONS); if (hasFloats) { MarkSameFloatManagerLinesDirty(this); } } else if (kFloatList == aListID) { // Make sure to mark affected lines dirty for the float frame // we are removing; this way is a bit messy, but so is the rest of the code. // See bug 390762. NS_ASSERTION(!aOldFrame->GetPrevContinuation(), "RemoveFrame should not be called on pushed floats."); for (nsIFrame* f = aOldFrame; f && !(f->GetStateBits() & NS_FRAME_IS_OVERFLOW_CONTAINER); f = f->GetNextContinuation()) { MarkSameFloatManagerLinesDirty(static_cast(f->GetParent())); } DoRemoveOutOfFlowFrame(aOldFrame); } else if (kNoReflowPrincipalList == aListID) { // Skip the call to |FrameNeedsReflow| below by returning now. DoRemoveFrame(aOldFrame, REMOVE_FIXED_CONTINUATIONS); return; } else { MOZ_CRASH("unexpected child list"); } PresContext()->PresShell()-> FrameNeedsReflow(this, nsIPresShell::eTreeChange, NS_FRAME_HAS_DIRTY_CHILDREN); // XXX sufficient? } static bool ShouldPutNextSiblingOnNewLine(nsIFrame* aLastFrame) { nsIAtom* type = aLastFrame->GetType(); if (type == nsGkAtoms::brFrame) { return true; } // XXX the TEXT_OFFSETS_NEED_FIXING check is a wallpaper for bug 822910. if (type == nsGkAtoms::textFrame && !(aLastFrame->GetStateBits() & TEXT_OFFSETS_NEED_FIXING)) { return aLastFrame->HasSignificantTerminalNewline(); } return false; } void nsBlockFrame::AddFrames(nsFrameList& aFrameList, nsIFrame* aPrevSibling) { // Clear our line cursor, since our lines may change. ClearLineCursor(); if (aFrameList.IsEmpty()) { return; } // If we're inserting at the beginning of our list and we have an // inside bullet, insert after that bullet. if (!aPrevSibling && HasInsideBullet()) { aPrevSibling = GetInsideBullet(); } // Attempt to find the line that contains the previous sibling nsLineList* lineList = &mLines; nsFrameList* frames = &mFrames; nsLineList::iterator prevSibLine = lineList->end(); int32_t prevSiblingIndex = -1; if (aPrevSibling) { // XXX_perf This is technically O(N^2) in some cases, but by using // RFind instead of Find, we make it O(N) in the most common case, // which is appending content. // Find the line that contains the previous sibling if (!nsLineBox::RFindLineContaining(aPrevSibling, lineList->begin(), prevSibLine, mFrames.LastChild(), &prevSiblingIndex)) { // Not in mLines - try overflow lines. FrameLines* overflowLines = GetOverflowLines(); bool found = false; if (overflowLines) { prevSibLine = overflowLines->mLines.end(); prevSiblingIndex = -1; found = nsLineBox::RFindLineContaining(aPrevSibling, overflowLines->mLines.begin(), prevSibLine, overflowLines->mFrames.LastChild(), &prevSiblingIndex); } if (MOZ_LIKELY(found)) { lineList = &overflowLines->mLines; frames = &overflowLines->mFrames; } else { // Note: defensive code! RFindLineContaining must not return // false in this case, so if it does... MOZ_ASSERT_UNREACHABLE("prev sibling not in line list"); aPrevSibling = nullptr; prevSibLine = lineList->end(); } } } // Find the frame following aPrevSibling so that we can join up the // two lists of frames. if (aPrevSibling) { // Split line containing aPrevSibling in two if the insertion // point is somewhere in the middle of the line. int32_t rem = prevSibLine->GetChildCount() - prevSiblingIndex - 1; if (rem) { // Split the line in two where the frame(s) are being inserted. nsLineBox* line = NewLineBox(prevSibLine, aPrevSibling->GetNextSibling(), rem); lineList->after_insert(prevSibLine, line); // Mark prevSibLine dirty and as needing textrun invalidation, since // we may be breaking up text in the line. Its previous line may also // need to be invalidated because it may be able to pull some text up. MarkLineDirty(prevSibLine, lineList); // The new line will also need its textruns recomputed because of the // frame changes. line->MarkDirty(); line->SetInvalidateTextRuns(true); } } else if (! lineList->empty()) { lineList->front()->MarkDirty(); lineList->front()->SetInvalidateTextRuns(true); } const nsFrameList::Slice& newFrames = frames->InsertFrames(nullptr, aPrevSibling, aFrameList); // Walk through the new frames being added and update the line data // structures to fit. for (nsFrameList::Enumerator e(newFrames); !e.AtEnd(); e.Next()) { nsIFrame* newFrame = e.get(); NS_ASSERTION(!aPrevSibling || aPrevSibling->GetNextSibling() == newFrame, "Unexpected aPrevSibling"); NS_ASSERTION(newFrame->GetType() != nsGkAtoms::placeholderFrame || (!newFrame->IsAbsolutelyPositioned() && !newFrame->IsFloating()), "Placeholders should not float or be positioned"); bool isBlock = newFrame->IsBlockOutside(); // If the frame is a block frame, or if there is no previous line or if the // previous line is a block line we need to make a new line. We also make // a new line, as an optimization, in the two cases we know we'll need it: // if the previous line ended with a
    , or if it has significant whitespace // and ended in a newline. if (isBlock || prevSibLine == lineList->end() || prevSibLine->IsBlock() || (aPrevSibling && ShouldPutNextSiblingOnNewLine(aPrevSibling))) { // Create a new line for the frame and add its line to the line // list. nsLineBox* line = NewLineBox(newFrame, isBlock); if (prevSibLine != lineList->end()) { // Append new line after prevSibLine lineList->after_insert(prevSibLine, line); ++prevSibLine; } else { // New line is going before the other lines lineList->push_front(line); prevSibLine = lineList->begin(); } } else { prevSibLine->NoteFrameAdded(newFrame); // We're adding inline content to prevSibLine, so we need to mark it // dirty, ensure its textruns are recomputed, and possibly do the same // to its previous line since that line may be able to pull content up. MarkLineDirty(prevSibLine, lineList); } aPrevSibling = newFrame; } #ifdef DEBUG MOZ_ASSERT(aFrameList.IsEmpty()); VerifyLines(true); #endif } void nsBlockFrame::RemoveFloatFromFloatCache(nsIFrame* aFloat) { // Find which line contains the float, so we can update // the float cache. LineIterator line = LinesBegin(), line_end = LinesEnd(); for ( ; line != line_end; ++line) { if (line->IsInline() && line->RemoveFloat(aFloat)) { break; } } } void nsBlockFrame::RemoveFloat(nsIFrame* aFloat) { #ifdef DEBUG // Floats live in mFloats, or in the PushedFloat or OverflowOutOfFlows // frame list properties. if (!mFloats.ContainsFrame(aFloat)) { MOZ_ASSERT((GetOverflowOutOfFlows() && GetOverflowOutOfFlows()->ContainsFrame(aFloat)) || (GetPushedFloats() && GetPushedFloats()->ContainsFrame(aFloat)), "aFloat is not our child or on an unexpected frame list"); } #endif if (mFloats.StartRemoveFrame(aFloat)) { return; } nsFrameList* list = GetPushedFloats(); if (list && list->ContinueRemoveFrame(aFloat)) { #if 0 // XXXmats not yet - need to investigate BlockReflowInput::mPushedFloats // first so we don't leave it pointing to a deleted list. if (list->IsEmpty()) { delete RemovePushedFloats(); } #endif return; } { nsAutoOOFFrameList oofs(this); if (oofs.mList.ContinueRemoveFrame(aFloat)) { return; } } } void nsBlockFrame::DoRemoveOutOfFlowFrame(nsIFrame* aFrame) { // The containing block is always the parent of aFrame. nsBlockFrame* block = (nsBlockFrame*)aFrame->GetParent(); // Remove aFrame from the appropriate list. if (aFrame->IsAbsolutelyPositioned()) { // This also deletes the next-in-flows block->GetAbsoluteContainingBlock()->RemoveFrame(block, kAbsoluteList, aFrame); } else { // First remove aFrame's next-in-flows. nsIFrame* nif = aFrame->GetNextInFlow(); if (nif) { nif->GetParent()->DeleteNextInFlowChild(nif, false); } // Now remove aFrame from its child list and Destroy it. block->RemoveFloatFromFloatCache(aFrame); block->RemoveFloat(aFrame); aFrame->Destroy(); } } /** * This helps us iterate over the list of all normal + overflow lines */ void nsBlockFrame::TryAllLines(nsLineList::iterator* aIterator, nsLineList::iterator* aStartIterator, nsLineList::iterator* aEndIterator, bool* aInOverflowLines, FrameLines** aOverflowLines) { if (*aIterator == *aEndIterator) { if (!*aInOverflowLines) { // Try the overflow lines *aInOverflowLines = true; FrameLines* lines = GetOverflowLines(); if (lines) { *aStartIterator = lines->mLines.begin(); *aIterator = *aStartIterator; *aEndIterator = lines->mLines.end(); *aOverflowLines = lines; } } } } nsBlockInFlowLineIterator::nsBlockInFlowLineIterator(nsBlockFrame* aFrame, LineIterator aLine) : mFrame(aFrame), mLine(aLine), mLineList(&aFrame->mLines) { // This will assert if aLine isn't in mLines of aFrame: DebugOnly check = aLine == mFrame->LinesBegin(); } nsBlockInFlowLineIterator::nsBlockInFlowLineIterator(nsBlockFrame* aFrame, LineIterator aLine, bool aInOverflow) : mFrame(aFrame), mLine(aLine), mLineList(aInOverflow ? &aFrame->GetOverflowLines()->mLines : &aFrame->mLines) { } nsBlockInFlowLineIterator::nsBlockInFlowLineIterator(nsBlockFrame* aFrame, bool* aFoundValidLine) : mFrame(aFrame), mLineList(&aFrame->mLines) { mLine = aFrame->LinesBegin(); *aFoundValidLine = FindValidLine(); } static nsIFrame* FindChildContaining(nsBlockFrame* aFrame, nsIFrame* aFindFrame) { NS_ASSERTION(aFrame, "must have frame"); nsIFrame* child; while (true) { nsIFrame* block = aFrame; do { child = nsLayoutUtils::FindChildContainingDescendant(block, aFindFrame); if (child) break; block = block->GetNextContinuation(); } while (block); if (!child) return nullptr; if (!(child->GetStateBits() & NS_FRAME_OUT_OF_FLOW)) break; aFindFrame = child->GetPlaceholderFrame(); } return child; } nsBlockInFlowLineIterator::nsBlockInFlowLineIterator(nsBlockFrame* aFrame, nsIFrame* aFindFrame, bool* aFoundValidLine) : mFrame(aFrame), mLineList(&aFrame->mLines) { *aFoundValidLine = false; nsIFrame* child = FindChildContaining(aFrame, aFindFrame); if (!child) return; LineIterator line_end = aFrame->LinesEnd(); // Try to use the cursor if it exists, otherwise fall back to the first line if (nsLineBox* const cursor = aFrame->GetLineCursor()) { mLine = line_end; // Perform a simultaneous forward and reverse search starting from the // line cursor. nsBlockFrame::LineIterator line = aFrame->LinesBeginFrom(cursor); nsBlockFrame::ReverseLineIterator rline = aFrame->LinesRBeginFrom(cursor); nsBlockFrame::ReverseLineIterator rline_end = aFrame->LinesREnd(); // rline is positioned on the line containing 'cursor', so it's not // rline_end. So we can safely increment it (i.e. move it to one line // earlier) to start searching there. ++rline; while (line != line_end || rline != rline_end) { if (line != line_end) { if (line->Contains(child)) { mLine = line; break; } ++line; } if (rline != rline_end) { if (rline->Contains(child)) { mLine = rline; break; } ++rline; } } if (mLine != line_end) { *aFoundValidLine = true; if (mLine != cursor) { aFrame->SetProperty(nsBlockFrame::LineCursorProperty(), mLine); } return; } } else { for (mLine = aFrame->LinesBegin(); mLine != line_end; ++mLine) { if (mLine->Contains(child)) { *aFoundValidLine = true; return; } } } // Didn't find the line MOZ_ASSERT(mLine == line_end, "mLine should be line_end at this point"); // If we reach here, it means that we have not been able to find the // desired frame in our in-flow lines. So we should start looking at // our overflow lines. In order to do that, we set mLine to the end // iterator so that FindValidLine starts to look at overflow lines, // if any. if (!FindValidLine()) return; do { if (mLine->Contains(child)) { *aFoundValidLine = true; return; } } while (Next()); } nsBlockFrame::LineIterator nsBlockInFlowLineIterator::End() { return mLineList->end(); } bool nsBlockInFlowLineIterator::IsLastLineInList() { LineIterator end = End(); return mLine != end && mLine.next() == end; } bool nsBlockInFlowLineIterator::Next() { ++mLine; return FindValidLine(); } bool nsBlockInFlowLineIterator::Prev() { LineIterator begin = mLineList->begin(); if (mLine != begin) { --mLine; return true; } bool currentlyInOverflowLines = GetInOverflow(); while (true) { if (currentlyInOverflowLines) { mLineList = &mFrame->mLines; mLine = mLineList->end(); if (mLine != mLineList->begin()) { --mLine; return true; } } else { mFrame = static_cast(mFrame->GetPrevInFlow()); if (!mFrame) return false; nsBlockFrame::FrameLines* overflowLines = mFrame->GetOverflowLines(); if (overflowLines) { mLineList = &overflowLines->mLines; mLine = mLineList->end(); NS_ASSERTION(mLine != mLineList->begin(), "empty overflow line list?"); --mLine; return true; } } currentlyInOverflowLines = !currentlyInOverflowLines; } } bool nsBlockInFlowLineIterator::FindValidLine() { LineIterator end = mLineList->end(); if (mLine != end) return true; bool currentlyInOverflowLines = GetInOverflow(); while (true) { if (currentlyInOverflowLines) { mFrame = static_cast(mFrame->GetNextInFlow()); if (!mFrame) return false; mLineList = &mFrame->mLines; mLine = mLineList->begin(); if (mLine != mLineList->end()) return true; } else { nsBlockFrame::FrameLines* overflowLines = mFrame->GetOverflowLines(); if (overflowLines) { mLineList = &overflowLines->mLines; mLine = mLineList->begin(); NS_ASSERTION(mLine != mLineList->end(), "empty overflow line list?"); return true; } } currentlyInOverflowLines = !currentlyInOverflowLines; } } static void RemoveBlockChild(nsIFrame* aFrame, bool aRemoveOnlyFluidContinuations) { if (!aFrame) { return; } nsBlockFrame* nextBlock = nsLayoutUtils::GetAsBlock(aFrame->GetParent()); NS_ASSERTION(nextBlock, "Our child's continuation's parent is not a block?"); nextBlock->DoRemoveFrame(aFrame, (aRemoveOnlyFluidContinuations ? 0 : nsBlockFrame::REMOVE_FIXED_CONTINUATIONS)); } // This function removes aDeletedFrame and all its continuations. It // is optimized for deleting a whole series of frames. The easy // implementation would invoke itself recursively on // aDeletedFrame->GetNextContinuation, then locate the line containing // aDeletedFrame and remove aDeletedFrame from that line. But here we // start by locating aDeletedFrame and then scanning from that point // on looking for continuations. void nsBlockFrame::DoRemoveFrame(nsIFrame* aDeletedFrame, uint32_t aFlags) { // Clear our line cursor, since our lines may change. ClearLineCursor(); if (aDeletedFrame->GetStateBits() & (NS_FRAME_OUT_OF_FLOW | NS_FRAME_IS_OVERFLOW_CONTAINER)) { if (!aDeletedFrame->GetPrevInFlow()) { NS_ASSERTION(aDeletedFrame->GetStateBits() & NS_FRAME_OUT_OF_FLOW, "Expected out-of-flow frame"); DoRemoveOutOfFlowFrame(aDeletedFrame); } else { nsContainerFrame::DeleteNextInFlowChild(aDeletedFrame, (aFlags & FRAMES_ARE_EMPTY) != 0); } return; } // Find the line that contains deletedFrame nsLineList::iterator line_start = mLines.begin(), line_end = mLines.end(); nsLineList::iterator line = line_start; FrameLines* overflowLines = nullptr; bool searchingOverflowList = false; // Make sure we look in the overflow lines even if the normal line // list is empty TryAllLines(&line, &line_start, &line_end, &searchingOverflowList, &overflowLines); while (line != line_end) { if (line->Contains(aDeletedFrame)) { break; } ++line; TryAllLines(&line, &line_start, &line_end, &searchingOverflowList, &overflowLines); } if (line == line_end) { NS_ERROR("can't find deleted frame in lines"); return; } if (!(aFlags & FRAMES_ARE_EMPTY)) { if (line != line_start) { line.prev()->MarkDirty(); line.prev()->SetInvalidateTextRuns(true); } else if (searchingOverflowList && !mLines.empty()) { mLines.back()->MarkDirty(); mLines.back()->SetInvalidateTextRuns(true); } } while (line != line_end && aDeletedFrame) { NS_ASSERTION(this == aDeletedFrame->GetParent(), "messed up delete code"); NS_ASSERTION(line->Contains(aDeletedFrame), "frame not in line"); if (!(aFlags & FRAMES_ARE_EMPTY)) { line->MarkDirty(); line->SetInvalidateTextRuns(true); } // If the frame being deleted is the last one on the line then // optimize away the line->Contains(next-in-flow) call below. bool isLastFrameOnLine = 1 == line->GetChildCount(); if (!isLastFrameOnLine) { LineIterator next = line.next(); nsIFrame* lastFrame = next != line_end ? next->mFirstChild->GetPrevSibling() : (searchingOverflowList ? overflowLines->mFrames.LastChild() : mFrames.LastChild()); NS_ASSERTION(next == line_end || lastFrame == line->LastChild(), "unexpected line frames"); isLastFrameOnLine = lastFrame == aDeletedFrame; } // Remove aDeletedFrame from the line if (line->mFirstChild == aDeletedFrame) { // We should be setting this to null if aDeletedFrame // is the only frame on the line. HOWEVER in that case // we will be removing the line anyway, see below. line->mFirstChild = aDeletedFrame->GetNextSibling(); } // Hmm, this won't do anything if we're removing a frame in the first // overflow line... Hopefully doesn't matter --line; if (line != line_end && !line->IsBlock()) { // Since we just removed a frame that follows some inline // frames, we need to reflow the previous line. line->MarkDirty(); } ++line; // Take aDeletedFrame out of the sibling list. Note that // prevSibling will only be nullptr when we are deleting the very // first frame in the main or overflow list. if (searchingOverflowList) { overflowLines->mFrames.RemoveFrame(aDeletedFrame); } else { mFrames.RemoveFrame(aDeletedFrame); } // Update the child count of the line to be accurate line->NoteFrameRemoved(aDeletedFrame); // Destroy frame; capture its next continuation first in case we need // to destroy that too. nsIFrame* deletedNextContinuation = (aFlags & REMOVE_FIXED_CONTINUATIONS) ? aDeletedFrame->GetNextContinuation() : aDeletedFrame->GetNextInFlow(); #ifdef NOISY_REMOVE_FRAME printf("DoRemoveFrame: %s line=%p frame=", searchingOverflowList?"overflow":"normal", line.get()); nsFrame::ListTag(stdout, aDeletedFrame); printf(" prevSibling=%p deletedNextContinuation=%p\n", aDeletedFrame->GetPrevSibling(), deletedNextContinuation); #endif // If next-in-flow is an overflow container, must remove it first. if (deletedNextContinuation && deletedNextContinuation->GetStateBits() & NS_FRAME_IS_OVERFLOW_CONTAINER) { deletedNextContinuation->GetParent()-> DeleteNextInFlowChild(deletedNextContinuation, false); deletedNextContinuation = nullptr; } aDeletedFrame->Destroy(); aDeletedFrame = deletedNextContinuation; bool haveAdvancedToNextLine = false; // If line is empty, remove it now. if (0 == line->GetChildCount()) { #ifdef NOISY_REMOVE_FRAME printf("DoRemoveFrame: %s line=%p became empty so it will be removed\n", searchingOverflowList?"overflow":"normal", line.get()); #endif nsLineBox *cur = line; if (!searchingOverflowList) { line = mLines.erase(line); // Invalidate the space taken up by the line. // XXX We need to do this if we're removing a frame as a result of // a call to RemoveFrame(), but we may not need to do this in all // cases... #ifdef NOISY_BLOCK_INVALIDATE nsRect visOverflow(cur->GetVisualOverflowArea()); printf("%p invalidate 10 (%d, %d, %d, %d)\n", this, visOverflow.x, visOverflow.y, visOverflow.width, visOverflow.height); #endif } else { line = overflowLines->mLines.erase(line); if (overflowLines->mLines.empty()) { DestroyOverflowLines(); overflowLines = nullptr; // We just invalidated our iterators. Since we were in // the overflow lines list, which is now empty, set them // so we're at the end of the regular line list. line_start = mLines.begin(); line_end = mLines.end(); line = line_end; } } FreeLineBox(cur); // If we're removing a line, ReflowDirtyLines isn't going to // know that it needs to slide lines unless something is marked // dirty. So mark the previous margin of the next line dirty if // there is one. if (line != line_end) { line->MarkPreviousMarginDirty(); } haveAdvancedToNextLine = true; } else { // Make the line that just lost a frame dirty, and advance to // the next line. if (!deletedNextContinuation || isLastFrameOnLine || !line->Contains(deletedNextContinuation)) { line->MarkDirty(); ++line; haveAdvancedToNextLine = true; } } if (deletedNextContinuation) { // See if we should keep looking in the current flow's line list. if (deletedNextContinuation->GetParent() != this) { // The deceased frames continuation is not a child of the // current block. So break out of the loop so that we advance // to the next parent. // // If we have a continuation in a different block then all bets are // off regarding whether we are deleting frames without actual content, // so don't propagate FRAMES_ARE_EMPTY any further. aFlags &= ~FRAMES_ARE_EMPTY; break; } // If we advanced to the next line then check if we should switch to the // overflow line list. if (haveAdvancedToNextLine) { if (line != line_end && !searchingOverflowList && !line->Contains(deletedNextContinuation)) { // We have advanced to the next *normal* line but the next-in-flow // is not there - force a switch to the overflow line list. line = line_end; } TryAllLines(&line, &line_start, &line_end, &searchingOverflowList, &overflowLines); #ifdef NOISY_REMOVE_FRAME printf("DoRemoveFrame: now on %s line=%p\n", searchingOverflowList?"overflow":"normal", line.get()); #endif } } } if (!(aFlags & FRAMES_ARE_EMPTY) && line.next() != line_end) { line.next()->MarkDirty(); line.next()->SetInvalidateTextRuns(true); } #ifdef DEBUG VerifyLines(true); VerifyOverflowSituation(); #endif // Advance to next flow block if the frame has more continuations RemoveBlockChild(aDeletedFrame, !(aFlags & REMOVE_FIXED_CONTINUATIONS)); } static bool FindBlockLineFor(nsIFrame* aChild, nsLineList::iterator aBegin, nsLineList::iterator aEnd, nsLineList::iterator* aResult) { MOZ_ASSERT(aChild->IsBlockOutside()); for (nsLineList::iterator line = aBegin; line != aEnd; ++line) { MOZ_ASSERT(line->GetChildCount() > 0); if (line->IsBlock() && line->mFirstChild == aChild) { MOZ_ASSERT(line->GetChildCount() == 1); *aResult = line; return true; } } return false; } static bool FindInlineLineFor(nsIFrame* aChild, const nsFrameList& aFrameList, nsLineList::iterator aBegin, nsLineList::iterator aEnd, nsLineList::iterator* aResult) { MOZ_ASSERT(!aChild->IsBlockOutside()); for (nsLineList::iterator line = aBegin; line != aEnd; ++line) { MOZ_ASSERT(line->GetChildCount() > 0); if (!line->IsBlock()) { // Optimize by comparing the line's last child first. nsLineList::iterator next = line.next(); if (aChild == (next == aEnd ? aFrameList.LastChild() : next->mFirstChild->GetPrevSibling()) || line->Contains(aChild)) { *aResult = line; return true; } } } return false; } static bool FindLineFor(nsIFrame* aChild, const nsFrameList& aFrameList, nsLineList::iterator aBegin, nsLineList::iterator aEnd, nsLineList::iterator* aResult) { return aChild->IsBlockOutside() ? FindBlockLineFor(aChild, aBegin, aEnd, aResult) : FindInlineLineFor(aChild, aFrameList, aBegin, aEnd, aResult); } nsresult nsBlockFrame::StealFrame(nsIFrame* aChild) { MOZ_ASSERT(aChild->GetParent() == this); if ((aChild->GetStateBits() & NS_FRAME_OUT_OF_FLOW) && aChild->IsFloating()) { RemoveFloat(aChild); return NS_OK; } if (MaybeStealOverflowContainerFrame(aChild)) { return NS_OK; } MOZ_ASSERT(!(aChild->GetStateBits() & NS_FRAME_OUT_OF_FLOW)); nsLineList::iterator line; if (FindLineFor(aChild, mFrames, mLines.begin(), mLines.end(), &line)) { RemoveFrameFromLine(aChild, line, mFrames, mLines); } else { FrameLines* overflowLines = GetOverflowLines(); DebugOnly found; found = FindLineFor(aChild, overflowLines->mFrames, overflowLines->mLines.begin(), overflowLines->mLines.end(), &line); MOZ_ASSERT(found); RemoveFrameFromLine(aChild, line, overflowLines->mFrames, overflowLines->mLines); if (overflowLines->mLines.empty()) { DestroyOverflowLines(); } } return NS_OK; } void nsBlockFrame::RemoveFrameFromLine(nsIFrame* aChild, nsLineList::iterator aLine, nsFrameList& aFrameList, nsLineList& aLineList) { aFrameList.RemoveFrame(aChild); if (aChild == aLine->mFirstChild) { aLine->mFirstChild = aChild->GetNextSibling(); } aLine->NoteFrameRemoved(aChild); if (aLine->GetChildCount() > 0) { aLine->MarkDirty(); } else { // The line became empty - destroy it. nsLineBox* lineBox = aLine; aLine = aLineList.erase(aLine); if (aLine != aLineList.end()) { aLine->MarkPreviousMarginDirty(); } FreeLineBox(lineBox); } } void nsBlockFrame::DeleteNextInFlowChild(nsIFrame* aNextInFlow, bool aDeletingEmptyFrames) { NS_PRECONDITION(aNextInFlow->GetPrevInFlow(), "bad next-in-flow"); if (aNextInFlow->GetStateBits() & (NS_FRAME_OUT_OF_FLOW | NS_FRAME_IS_OVERFLOW_CONTAINER)) { nsContainerFrame::DeleteNextInFlowChild(aNextInFlow, aDeletingEmptyFrames); } else { #ifdef DEBUG if (aDeletingEmptyFrames) { nsLayoutUtils::AssertTreeOnlyEmptyNextInFlows(aNextInFlow); } #endif DoRemoveFrame(aNextInFlow, aDeletingEmptyFrames ? FRAMES_ARE_EMPTY : 0); } } const nsStyleText* nsBlockFrame::StyleTextForLineLayout() { // Return the pointer to an unmodified style text return StyleText(); } //////////////////////////////////////////////////////////////////////// // Float support LogicalRect nsBlockFrame::AdjustFloatAvailableSpace(BlockReflowInput& aState, const LogicalRect& aFloatAvailableSpace, nsIFrame* aFloatFrame) { // Compute the available inline size. By default, assume the inline // size of the containing block. nscoord availISize; const nsStyleDisplay* floatDisplay = aFloatFrame->StyleDisplay(); WritingMode wm = aState.mReflowInput.GetWritingMode(); if (mozilla::StyleDisplay::Table != floatDisplay->mDisplay || eCompatibility_NavQuirks != aState.mPresContext->CompatibilityMode() ) { availISize = aState.ContentISize(); } else { // This quirk matches the one in BlockReflowInput::FlowAndPlaceFloat // give tables only the available space // if they can shrink we may not be constrained to place // them in the next line availISize = aFloatAvailableSpace.ISize(wm); } nscoord availBSize = NS_UNCONSTRAINEDSIZE == aState.ContentBSize() ? NS_UNCONSTRAINEDSIZE : std::max(0, aState.ContentBEnd() - aState.mBCoord); if (availBSize != NS_UNCONSTRAINEDSIZE && !aState.mFlags.mFloatFragmentsInsideColumnEnabled && nsLayoutUtils::GetClosestFrameOfType(this, nsGkAtoms::columnSetFrame)) { // Tell the float it has unrestricted block-size, so it won't break. // If the float doesn't actually fit in the column it will fail to be // placed, and either move to the block-start of the next column or just // overflow. availBSize = NS_UNCONSTRAINEDSIZE; } return LogicalRect(wm, aState.ContentIStart(), aState.ContentBStart(), availISize, availBSize); } nscoord nsBlockFrame::ComputeFloatISize(BlockReflowInput& aState, const LogicalRect& aFloatAvailableSpace, nsIFrame* aFloat) { NS_PRECONDITION(aFloat->GetStateBits() & NS_FRAME_OUT_OF_FLOW, "aFloat must be an out-of-flow frame"); // Reflow the float. LogicalRect availSpace = AdjustFloatAvailableSpace(aState, aFloatAvailableSpace, aFloat); WritingMode blockWM = aState.mReflowInput.GetWritingMode(); WritingMode floatWM = aFloat->GetWritingMode(); ReflowInput floatRS(aState.mPresContext, aState.mReflowInput, aFloat, availSpace.Size(blockWM).ConvertTo(floatWM, blockWM)); return floatRS.ComputedSizeWithMarginBorderPadding(blockWM).ISize(blockWM); } void nsBlockFrame::ReflowFloat(BlockReflowInput& aState, const LogicalRect& aAdjustedAvailableSpace, nsIFrame* aFloat, LogicalMargin& aFloatMargin, LogicalMargin& aFloatOffsets, bool aFloatPushedDown, nsReflowStatus& aReflowStatus) { NS_PRECONDITION(aFloat->GetStateBits() & NS_FRAME_OUT_OF_FLOW, "aFloat must be an out-of-flow frame"); // Reflow the float. aReflowStatus = NS_FRAME_COMPLETE; WritingMode wm = aState.mReflowInput.GetWritingMode(); #ifdef NOISY_FLOAT printf("Reflow Float %p in parent %p, availSpace(%d,%d,%d,%d)\n", aFloat, this, aAdjustedAvailableSpace.IStart(wm), aAdjustedAvailableSpace.BStart(wm), aAdjustedAvailableSpace.ISize(wm), aAdjustedAvailableSpace.BSize(wm) ); #endif ReflowInput floatRS(aState.mPresContext, aState.mReflowInput, aFloat, aAdjustedAvailableSpace.Size(wm).ConvertTo(aFloat->GetWritingMode(), wm)); // Normally the mIsTopOfPage state is copied from the parent reflow // state. However, when reflowing a float, if we've placed other // floats that force this float *down* or *narrower*, we should unset // the mIsTopOfPage state. // FIXME: This is somewhat redundant with the |isAdjacentWithTop| // variable below, which has the exact same effect. Perhaps it should // be merged into that, except that the test for narrowing here is not // about adjacency with the top, so it seems misleading. if (floatRS.mFlags.mIsTopOfPage && (aFloatPushedDown || aAdjustedAvailableSpace.ISize(wm) != aState.ContentISize())) { floatRS.mFlags.mIsTopOfPage = false; } // Setup a block reflow context to reflow the float. nsBlockReflowContext brc(aState.mPresContext, aState.mReflowInput); // Reflow the float bool isAdjacentWithTop = aState.IsAdjacentWithTop(); nsIFrame* clearanceFrame = nullptr; do { nsCollapsingMargin margin; bool mayNeedRetry = false; floatRS.mDiscoveredClearance = nullptr; // Only first in flow gets a block-start margin. if (!aFloat->GetPrevInFlow()) { brc.ComputeCollapsedBStartMargin(floatRS, &margin, clearanceFrame, &mayNeedRetry); if (mayNeedRetry && !clearanceFrame) { floatRS.mDiscoveredClearance = &clearanceFrame; // We don't need to push the float manager state because the the block has its own // float manager that will be destroyed and recreated } } brc.ReflowBlock(aAdjustedAvailableSpace, true, margin, 0, isAdjacentWithTop, nullptr, floatRS, aReflowStatus, aState); } while (clearanceFrame); if (!NS_FRAME_IS_FULLY_COMPLETE(aReflowStatus) && ShouldAvoidBreakInside(floatRS)) { aReflowStatus = NS_INLINE_LINE_BREAK_BEFORE(); } else if (NS_FRAME_IS_NOT_COMPLETE(aReflowStatus) && (NS_UNCONSTRAINEDSIZE == aAdjustedAvailableSpace.BSize(wm))) { // An incomplete reflow status means we should split the float // if the height is constrained (bug 145305). aReflowStatus = NS_FRAME_COMPLETE; } if (aReflowStatus & NS_FRAME_REFLOW_NEXTINFLOW) { aState.mReflowStatus |= NS_FRAME_REFLOW_NEXTINFLOW; } if (aFloat->GetType() == nsGkAtoms::letterFrame) { // We never split floating first letters; an incomplete state for // such frames simply means that there is more content to be // reflowed on the line. if (NS_FRAME_IS_NOT_COMPLETE(aReflowStatus)) aReflowStatus = NS_FRAME_COMPLETE; } // Capture the margin and offsets information for the caller aFloatMargin = // float margins don't collapse floatRS.ComputedLogicalMargin().ConvertTo(wm, floatRS.GetWritingMode()); aFloatOffsets = floatRS.ComputedLogicalOffsets().ConvertTo(wm, floatRS.GetWritingMode()); const ReflowOutput& metrics = brc.GetMetrics(); // Set the rect, make sure the view is properly sized and positioned, // and tell the frame we're done reflowing it // XXXldb This seems like the wrong place to be doing this -- shouldn't // we be doing this in BlockReflowInput::FlowAndPlaceFloat after // we've positioned the float, and shouldn't we be doing the equivalent // of |PlaceFrameView| here? WritingMode metricsWM = metrics.GetWritingMode(); aFloat->SetSize(metricsWM, metrics.Size(metricsWM)); if (aFloat->HasView()) { nsContainerFrame::SyncFrameViewAfterReflow(aState.mPresContext, aFloat, aFloat->GetView(), metrics.VisualOverflow(), NS_FRAME_NO_MOVE_VIEW); } // Pass floatRS so the frame hierarchy can be used (redoFloatRS has the same hierarchy) aFloat->DidReflow(aState.mPresContext, &floatRS, nsDidReflowStatus::FINISHED); #ifdef NOISY_FLOAT printf("end ReflowFloat %p, sized to %d,%d\n", aFloat, metrics.Width(), metrics.Height()); #endif } StyleClear nsBlockFrame::FindTrailingClear() { // find the break type of the last line for (nsIFrame* b = this; b; b = b->GetPrevInFlow()) { nsBlockFrame* block = static_cast(b); LineIterator endLine = block->LinesEnd(); if (endLine != block->LinesBegin()) { --endLine; return endLine->GetBreakTypeAfter(); } } return StyleClear::None; } void nsBlockFrame::ReflowPushedFloats(BlockReflowInput& aState, nsOverflowAreas& aOverflowAreas, nsReflowStatus& aStatus) { // Pushed floats live at the start of our float list; see comment // above nsBlockFrame::DrainPushedFloats. nsIFrame* f = mFloats.FirstChild(); nsIFrame* prev = nullptr; while (f && (f->GetStateBits() & NS_FRAME_IS_PUSHED_FLOAT)) { MOZ_ASSERT(prev == f->GetPrevSibling()); // When we push a first-continuation float in a non-initial reflow, // it's possible that we end up with two continuations with the same // parent. This happens if, on the previous reflow of the block or // a previous reflow of the line containing the block, the float was // split between continuations A and B of the parent, but on the // current reflow, none of the float can fit in A. // // When this happens, we might even have the two continuations // out-of-order due to the management of the pushed floats. In // particular, if the float's placeholder was in a pushed line that // we reflowed before it was pushed, and we split the float during // that reflow, we might have the continuation of the float before // the float itself. (In the general case, however, it's correct // for floats in the pushed floats list to come before floats // anchored in pushed lines; however, in this case it's wrong. We // should probably find a way to fix it somehow, since it leads to // incorrect layout in some cases.) // // When we have these out-of-order continuations, we might hit the // next-continuation before the previous-continuation. When that // happens, just push it. When we reflow the next continuation, // we'll either pull all of its content back and destroy it (by // calling DeleteNextInFlowChild), or nsBlockFrame::SplitFloat will // pull it out of its current position and push it again (and // potentially repeat this cycle for the next continuation, although // hopefully then they'll be in the right order). // // We should also need this code for the in-order case if the first // continuation of a float gets moved across more than one // continuation of the containing block. In this case we'd manage // to push the second continuation without this check, but not the // third and later. nsIFrame *prevContinuation = f->GetPrevContinuation(); if (prevContinuation && prevContinuation->GetParent() == f->GetParent()) { mFloats.RemoveFrame(f); aState.AppendPushedFloatChain(f); f = !prev ? mFloats.FirstChild() : prev->GetNextSibling(); continue; } // Always call FlowAndPlaceFloat; we might need to place this float // if didn't belong to this block the last time it was reflowed. aState.FlowAndPlaceFloat(f); ConsiderChildOverflow(aOverflowAreas, f); nsIFrame* next = !prev ? mFloats.FirstChild() : prev->GetNextSibling(); if (next == f) { // We didn't push |f| so its next-sibling is next. next = f->GetNextSibling(); prev = f; } // else: we did push |f| so |prev|'s new next-sibling is next. f = next; } // If there are continued floats, then we may need to continue BR clearance if (0 != aState.ClearFloats(0, StyleClear::Both)) { nsBlockFrame* prevBlock = static_cast(GetPrevInFlow()); if (prevBlock) { aState.mFloatBreakType = prevBlock->FindTrailingClear(); } } } void nsBlockFrame::RecoverFloats(nsFloatManager& aFloatManager, WritingMode aWM, const nsSize& aContainerSize) { // Recover our own floats nsIFrame* stop = nullptr; // Stop before we reach pushed floats that // belong to our next-in-flow for (nsIFrame* f = mFloats.FirstChild(); f && f != stop; f = f->GetNextSibling()) { LogicalRect region = nsFloatManager::GetRegionFor(aWM, f, aContainerSize); aFloatManager.AddFloat(f, region, aWM, aContainerSize); if (!stop && f->GetNextInFlow()) stop = f->GetNextInFlow(); } // Recurse into our overflow container children for (nsIFrame* oc = GetChildList(kOverflowContainersList).FirstChild(); oc; oc = oc->GetNextSibling()) { RecoverFloatsFor(oc, aFloatManager, aWM, aContainerSize); } // Recurse into our normal children for (nsBlockFrame::LineIterator line = LinesBegin(); line != LinesEnd(); ++line) { if (line->IsBlock()) { RecoverFloatsFor(line->mFirstChild, aFloatManager, aWM, aContainerSize); } } } void nsBlockFrame::RecoverFloatsFor(nsIFrame* aFrame, nsFloatManager& aFloatManager, WritingMode aWM, const nsSize& aContainerSize) { NS_PRECONDITION(aFrame, "null frame"); // Only blocks have floats nsBlockFrame* block = nsLayoutUtils::GetAsBlock(aFrame); // Don't recover any state inside a block that has its own space manager // (we don't currently have any blocks like this, though, thanks to our // use of extra frames for 'overflow') if (block && !nsBlockFrame::BlockNeedsFloatManager(block)) { // If the element is relatively positioned, then adjust x and y // accordingly so that we consider relatively positioned frames // at their original position. LogicalRect rect(aWM, block->GetNormalRect(), aContainerSize); nscoord lineLeft = rect.LineLeft(aWM, aContainerSize); nscoord blockStart = rect.BStart(aWM); aFloatManager.Translate(lineLeft, blockStart); block->RecoverFloats(aFloatManager, aWM, aContainerSize); aFloatManager.Translate(-lineLeft, -blockStart); } } ////////////////////////////////////////////////////////////////////// // Painting, event handling #ifdef DEBUG static void ComputeVisualOverflowArea(nsLineList& aLines, nscoord aWidth, nscoord aHeight, nsRect& aResult) { nscoord xa = 0, ya = 0, xb = aWidth, yb = aHeight; for (nsLineList::iterator line = aLines.begin(), line_end = aLines.end(); line != line_end; ++line) { // Compute min and max x/y values for the reflowed frame's // combined areas nsRect visOverflow(line->GetVisualOverflowArea()); nscoord x = visOverflow.x; nscoord y = visOverflow.y; nscoord xmost = x + visOverflow.width; nscoord ymost = y + visOverflow.height; if (x < xa) { xa = x; } if (xmost > xb) { xb = xmost; } if (y < ya) { ya = y; } if (ymost > yb) { yb = ymost; } } aResult.x = xa; aResult.y = ya; aResult.width = xb - xa; aResult.height = yb - ya; } #endif bool nsBlockFrame::IsVisibleInSelection(nsISelection* aSelection) { if (mContent->IsAnyOfHTMLElements(nsGkAtoms::html, nsGkAtoms::body)) return true; nsCOMPtr node(do_QueryInterface(mContent)); bool visible; nsresult rv = aSelection->ContainsNode(node, true, &visible); return NS_SUCCEEDED(rv) && visible; } #ifdef DEBUG static void DebugOutputDrawLine(int32_t aDepth, nsLineBox* aLine, bool aDrawn) { if (nsBlockFrame::gNoisyDamageRepair) { nsFrame::IndentBy(stdout, aDepth+1); nsRect lineArea = aLine->GetVisualOverflowArea(); printf("%s line=%p bounds=%d,%d,%d,%d ca=%d,%d,%d,%d\n", aDrawn ? "draw" : "skip", static_cast(aLine), aLine->IStart(), aLine->BStart(), aLine->ISize(), aLine->BSize(), lineArea.x, lineArea.y, lineArea.width, lineArea.height); } } #endif static void DisplayLine(nsDisplayListBuilder* aBuilder, const nsRect& aLineArea, const nsRect& aDirtyRect, nsBlockFrame::LineIterator& aLine, int32_t aDepth, int32_t& aDrawnLines, const nsDisplayListSet& aLists, nsBlockFrame* aFrame, TextOverflow* aTextOverflow) { // If the line's combined area (which includes child frames that // stick outside of the line's bounding box or our bounding box) // intersects the dirty rect then paint the line. bool intersect = aLineArea.Intersects(aDirtyRect); #ifdef DEBUG if (nsBlockFrame::gLamePaintMetrics) { aDrawnLines++; } DebugOutputDrawLine(aDepth, aLine.get(), intersect); #endif // The line might contain a placeholder for a visible out-of-flow, in which // case we need to descend into it. If there is such a placeholder, we will // have NS_FRAME_FORCE_DISPLAY_LIST_DESCEND_INTO set. // In particular, we really want to check ShouldDescendIntoFrame() // on all the frames on the line, but that might be expensive. So // we approximate it by checking it on aFrame; if it's true for any // frame in the line, it's also true for aFrame. bool lineInline = aLine->IsInline(); bool lineMayHaveTextOverflow = aTextOverflow && lineInline; if (!intersect && !aBuilder->ShouldDescendIntoFrame(aFrame) && !lineMayHaveTextOverflow) return; // Collect our line's display items in a temporary nsDisplayListCollection, // so that we can apply any "text-overflow" clipping to the entire collection // without affecting previous lines. nsDisplayListCollection collection; // Block-level child backgrounds go on the blockBorderBackgrounds list ... // Inline-level child backgrounds go on the regular child content list. nsDisplayListSet childLists(collection, lineInline ? collection.Content() : collection.BlockBorderBackgrounds()); uint32_t flags = lineInline ? nsIFrame::DISPLAY_CHILD_INLINE : 0; nsIFrame* kid = aLine->mFirstChild; int32_t n = aLine->GetChildCount(); while (--n >= 0) { aFrame->BuildDisplayListForChild(aBuilder, kid, aDirtyRect, childLists, flags); kid = kid->GetNextSibling(); } if (lineMayHaveTextOverflow) { aTextOverflow->ProcessLine(collection, aLine.get()); } collection.MoveTo(aLists); } void nsBlockFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder, const nsRect& aDirtyRect, const nsDisplayListSet& aLists) { int32_t drawnLines; // Will only be used if set (gLamePaintMetrics). int32_t depth = 0; #ifdef DEBUG if (gNoisyDamageRepair) { depth = GetDepth(); nsRect ca; ::ComputeVisualOverflowArea(mLines, mRect.width, mRect.height, ca); nsFrame::IndentBy(stdout, depth); ListTag(stdout); printf(": bounds=%d,%d,%d,%d dirty(absolute)=%d,%d,%d,%d ca=%d,%d,%d,%d\n", mRect.x, mRect.y, mRect.width, mRect.height, aDirtyRect.x, aDirtyRect.y, aDirtyRect.width, aDirtyRect.height, ca.x, ca.y, ca.width, ca.height); } PRTime start = 0; // Initialize these variables to silence the compiler. if (gLamePaintMetrics) { start = PR_Now(); drawnLines = 0; } #endif DisplayBorderBackgroundOutline(aBuilder, aLists); if (GetPrevInFlow()) { DisplayOverflowContainers(aBuilder, aDirtyRect, aLists); for (nsIFrame* f : mFloats) { if (f->GetStateBits() & NS_FRAME_IS_PUSHED_FLOAT) BuildDisplayListForChild(aBuilder, f, aDirtyRect, aLists); } } aBuilder->MarkFramesForDisplayList(this, mFloats, aDirtyRect); // Prepare for text-overflow processing. UniquePtr textOverflow( TextOverflow::WillProcessLines(aBuilder, this)); // We'll collect our lines' display items here, & then append this to aLists. nsDisplayListCollection linesDisplayListCollection; // Don't use the line cursor if we might have a descendant placeholder ... // it might skip lines that contain placeholders but don't themselves // intersect with the dirty area. // In particular, we really want to check ShouldDescendIntoFrame() // on all our child frames, but that might be expensive. So we // approximate it by checking it on |this|; if it's true for any // frame in our child list, it's also true for |this|. nsLineBox* cursor = aBuilder->ShouldDescendIntoFrame(this) ? nullptr : GetFirstLineContaining(aDirtyRect.y); LineIterator line_end = LinesEnd(); if (cursor) { for (LineIterator line = mLines.begin(cursor); line != line_end; ++line) { nsRect lineArea = line->GetVisualOverflowArea(); if (!lineArea.IsEmpty()) { // Because we have a cursor, the combinedArea.ys are non-decreasing. // Once we've passed aDirtyRect.YMost(), we can never see it again. if (lineArea.y >= aDirtyRect.YMost()) { break; } DisplayLine(aBuilder, lineArea, aDirtyRect, line, depth, drawnLines, linesDisplayListCollection, this, textOverflow.get()); } } } else { bool nonDecreasingYs = true; int32_t lineCount = 0; nscoord lastY = INT32_MIN; nscoord lastYMost = INT32_MIN; for (LineIterator line = LinesBegin(); line != line_end; ++line) { nsRect lineArea = line->GetVisualOverflowArea(); DisplayLine(aBuilder, lineArea, aDirtyRect, line, depth, drawnLines, linesDisplayListCollection, this, textOverflow.get()); if (!lineArea.IsEmpty()) { if (lineArea.y < lastY || lineArea.YMost() < lastYMost) { nonDecreasingYs = false; } lastY = lineArea.y; lastYMost = lineArea.YMost(); } lineCount++; } if (nonDecreasingYs && lineCount >= MIN_LINES_NEEDING_CURSOR) { SetupLineCursor(); } } // Pick up the resulting text-overflow markers. We append them to // PositionedDescendants just before we append the lines' display items, // so that our text-overflow markers will appear on top of this block's // normal content but below any of its its' positioned children. if (textOverflow) { aLists.PositionedDescendants()->AppendToTop(&textOverflow->GetMarkers()); } linesDisplayListCollection.MoveTo(aLists); if (HasOutsideBullet()) { // Display outside bullets manually nsIFrame* bullet = GetOutsideBullet(); BuildDisplayListForChild(aBuilder, bullet, aDirtyRect, aLists); } #ifdef DEBUG if (gLamePaintMetrics) { PRTime end = PR_Now(); int32_t numLines = mLines.size(); if (!numLines) numLines = 1; PRTime lines, deltaPerLine, delta; lines = int64_t(numLines); delta = end - start; deltaPerLine = delta / lines; ListTag(stdout); char buf[400]; SprintfLiteral(buf, ": %" PRId64 " elapsed (%" PRId64 " per line) lines=%d drawn=%d skip=%d", delta, deltaPerLine, numLines, drawnLines, numLines - drawnLines); printf("%s\n", buf); } #endif } #ifdef ACCESSIBILITY a11y::AccType nsBlockFrame::AccessibleType() { if (IsTableCaption()) { return GetRect().IsEmpty() ? a11y::eNoType : a11y::eHTMLCaptionType; } // block frame may be for


    if (mContent->IsHTMLElement(nsGkAtoms::hr)) { return a11y::eHTMLHRType; } if (!HasBullet() || !PresContext()) { //XXXsmaug What if we're in the shadow dom? if (!mContent->GetParent()) { // Don't create accessible objects for the root content node, they are redundant with // the nsDocAccessible object created with the document node return a11y::eNoType; } nsCOMPtr htmlDoc = do_QueryInterface(mContent->GetComposedDoc()); if (htmlDoc) { nsCOMPtr body; htmlDoc->GetBody(getter_AddRefs(body)); if (SameCOMIdentity(body, mContent)) { // Don't create accessible objects for the body, they are redundant with // the nsDocAccessible object created with the document node return a11y::eNoType; } } // Not a bullet, treat as normal HTML container return a11y::eHyperTextType; } // Create special list bullet accessible return a11y::eHTMLLiType; } #endif void nsBlockFrame::ClearLineCursor() { if (!(GetStateBits() & NS_BLOCK_HAS_LINE_CURSOR)) { return; } DeleteProperty(LineCursorProperty()); RemoveStateBits(NS_BLOCK_HAS_LINE_CURSOR); } void nsBlockFrame::SetupLineCursor() { if (GetStateBits() & NS_BLOCK_HAS_LINE_CURSOR || mLines.empty()) { return; } SetProperty(LineCursorProperty(), mLines.front()); AddStateBits(NS_BLOCK_HAS_LINE_CURSOR); } nsLineBox* nsBlockFrame::GetFirstLineContaining(nscoord y) { if (!(GetStateBits() & NS_BLOCK_HAS_LINE_CURSOR)) { return nullptr; } nsLineBox* property = GetProperty(LineCursorProperty()); LineIterator cursor = mLines.begin(property); nsRect cursorArea = cursor->GetVisualOverflowArea(); while ((cursorArea.IsEmpty() || cursorArea.YMost() > y) && cursor != mLines.front()) { cursor = cursor.prev(); cursorArea = cursor->GetVisualOverflowArea(); } while ((cursorArea.IsEmpty() || cursorArea.YMost() <= y) && cursor != mLines.back()) { cursor = cursor.next(); cursorArea = cursor->GetVisualOverflowArea(); } if (cursor.get() != property) { SetProperty(LineCursorProperty(), cursor.get()); } return cursor.get(); } /* virtual */ void nsBlockFrame::ChildIsDirty(nsIFrame* aChild) { // See if the child is absolutely positioned if (aChild->GetStateBits() & NS_FRAME_OUT_OF_FLOW && aChild->IsAbsolutelyPositioned()) { // do nothing } else if (aChild == GetOutsideBullet()) { // The bullet lives in the first line, unless the first line has // height 0 and there is a second line, in which case it lives // in the second line. LineIterator bulletLine = LinesBegin(); if (bulletLine != LinesEnd() && bulletLine->BSize() == 0 && bulletLine != mLines.back()) { bulletLine = bulletLine.next(); } if (bulletLine != LinesEnd()) { MarkLineDirty(bulletLine, &mLines); } // otherwise we have an empty line list, and ReflowDirtyLines // will handle reflowing the bullet. } else { // Note that we should go through our children to mark lines dirty // before the next reflow. Doing it now could make things O(N^2) // since finding the right line is O(N). // We don't need to worry about marking lines on the overflow list // as dirty; we're guaranteed to reflow them if we take them off the // overflow list. // However, we might have gotten a float, in which case we need to // reflow the line containing its placeholder. So find the // ancestor-or-self of the placeholder that's a child of the block, // and mark it as NS_FRAME_HAS_DIRTY_CHILDREN too, so that we mark // its line dirty when we handle NS_BLOCK_LOOK_FOR_DIRTY_FRAMES. // We need to take some care to handle the case where a float is in // a different continuation than its placeholder, including marking // an extra block with NS_BLOCK_LOOK_FOR_DIRTY_FRAMES. if (!(aChild->GetStateBits() & NS_FRAME_OUT_OF_FLOW)) { AddStateBits(NS_BLOCK_LOOK_FOR_DIRTY_FRAMES); } else { NS_ASSERTION(aChild->IsFloating(), "should be a float"); nsIFrame* thisFC = FirstContinuation(); nsIFrame* placeholderPath = aChild->GetPlaceholderFrame(); // SVG code sometimes sends FrameNeedsReflow notifications during // frame destruction, leading to null placeholders, but we're safe // ignoring those. if (placeholderPath) { for (;;) { nsIFrame *parent = placeholderPath->GetParent(); if (parent->GetContent() == mContent && parent->FirstContinuation() == thisFC) { parent->AddStateBits(NS_BLOCK_LOOK_FOR_DIRTY_FRAMES); break; } placeholderPath = parent; } placeholderPath->AddStateBits(NS_FRAME_HAS_DIRTY_CHILDREN); } } } nsContainerFrame::ChildIsDirty(aChild); } void nsBlockFrame::Init(nsIContent* aContent, nsContainerFrame* aParent, nsIFrame* aPrevInFlow) { if (aPrevInFlow) { // Copy over the inherited block frame bits from the prev-in-flow. RemoveStateBits(NS_BLOCK_FLAGS_MASK); AddStateBits(aPrevInFlow->GetStateBits() & (NS_BLOCK_FLAGS_MASK & ~NS_BLOCK_FLAGS_NON_INHERITED_MASK)); } nsContainerFrame::Init(aContent, aParent, aPrevInFlow); if (!aPrevInFlow || aPrevInFlow->GetStateBits() & NS_BLOCK_NEEDS_BIDI_RESOLUTION) { AddStateBits(NS_BLOCK_NEEDS_BIDI_RESOLUTION); } // If a box has a different block flow direction than its containing block: // ... // If the box is a block container, then it establishes a new block // formatting context. // (http://dev.w3.org/csswg/css-writing-modes/#block-flow) // If the box has contain: paint (or contain: strict), then it should also // establish a formatting context. if ((GetParent() && StyleVisibility()->mWritingMode != GetParent()->StyleVisibility()->mWritingMode) || StyleDisplay()->IsContainPaint()) { AddStateBits(NS_BLOCK_FLOAT_MGR | NS_BLOCK_MARGIN_ROOT); } if ((GetStateBits() & (NS_FRAME_FONT_INFLATION_CONTAINER | NS_BLOCK_FLOAT_MGR)) == (NS_FRAME_FONT_INFLATION_CONTAINER | NS_BLOCK_FLOAT_MGR)) { AddStateBits(NS_FRAME_FONT_INFLATION_FLOW_ROOT); } } void nsBlockFrame::SetInitialChildList(ChildListID aListID, nsFrameList& aChildList) { if (kFloatList == aListID) { mFloats.SetFrames(aChildList); } else if (kPrincipalList == aListID) { NS_ASSERTION((GetStateBits() & (NS_BLOCK_FRAME_HAS_INSIDE_BULLET | NS_BLOCK_FRAME_HAS_OUTSIDE_BULLET)) == 0, "how can we have a bullet already?"); #ifdef DEBUG // The only times a block that is an anonymous box is allowed to have a // first-letter frame are when it's the block inside a non-anonymous cell, // the block inside a fieldset, button or column set, or a scrolled content // block, except for