The Tor Browser: layout/generic/nsInlineFrame.cpp@6474c204b198 (annotated)

layout/generic/nsInlineFrame.cpp@6474c204b198 (annotated)

layout/generic/nsInlineFrame.cpp

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 /* rendering object for CSS display:inline objects */
 #include "nsInlineFrame.h"
 #include "nsLineLayout.h"
 #include "nsBlockFrame.h"
 #include "nsPlaceholderFrame.h"
 #include "nsGkAtoms.h"
 #include "nsStyleContext.h"
 #include "nsPresContext.h"
 #include "nsRenderingContext.h"
 #include "nsCSSAnonBoxes.h"
 #include "nsAutoPtr.h"
 #include "RestyleManager.h"
 #include "nsDisplayList.h"
 #include "mozilla/Likely.h"
 #ifdef DEBUG
 #undef NOISY_PUSHING
 #endif
 using namespace mozilla;
 using namespace mozilla::layout;
 //////////////////////////////////////////////////////////////////////
 // Basic nsInlineFrame methods
 nsIFrame*
 NS_NewInlineFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
 {
   return new (aPresShell) nsInlineFrame(aContext);
 }
 NS_IMPL_FRAMEARENA_HELPERS(nsInlineFrame)
 NS_QUERYFRAME_HEAD(nsInlineFrame)
   NS_QUERYFRAME_ENTRY(nsInlineFrame)
 NS_QUERYFRAME_TAIL_INHERITING(nsContainerFrame)
 #ifdef DEBUG_FRAME_DUMP
 nsresult
 nsInlineFrame::GetFrameName(nsAString& aResult) const
 {
   return MakeFrameName(NS_LITERAL_STRING("Inline"), aResult);
 }
 #endif
 nsIAtom*
 nsInlineFrame::GetType() const
 {
   return nsGkAtoms::inlineFrame;
 }
 void
 nsInlineFrame::InvalidateFrame(uint32_t aDisplayItemKey)
 {
   if (IsSVGText()) {
     nsIFrame* svgTextFrame =
       nsLayoutUtils::GetClosestFrameOfType(GetParent(),
                                            nsGkAtoms::svgTextFrame);
     svgTextFrame->InvalidateFrame();
     return;
   }
   nsInlineFrameBase::InvalidateFrame(aDisplayItemKey);
 }
 void
 nsInlineFrame::InvalidateFrameWithRect(const nsRect& aRect, uint32_t aDisplayItemKey)
 {
   if (IsSVGText()) {
     nsIFrame* svgTextFrame =
       nsLayoutUtils::GetClosestFrameOfType(GetParent(),
                                            nsGkAtoms::svgTextFrame);
     svgTextFrame->InvalidateFrame();
     return;
   }
   nsInlineFrameBase::InvalidateFrameWithRect(aRect, aDisplayItemKey);
 }
 static inline bool
 IsMarginZero(const nsStyleCoord &aCoord)
 {
   return aCoord.GetUnit() == eStyleUnit_Auto ||
          nsLayoutUtils::IsMarginZero(aCoord);
 }
 /* virtual */ bool
 nsInlineFrame::IsSelfEmpty()
 {
 #if 0
   // I used to think inline frames worked this way, but it seems they
   // don't.  At least not in our codebase.
   if (GetPresContext()->CompatibilityMode() == eCompatibility_FullStandards) {
     return false;
   }
 #endif
   const nsStyleMargin* margin = StyleMargin();
   const nsStyleBorder* border = StyleBorder();
   const nsStylePadding* padding = StylePadding();
   // XXX Top and bottom removed, since they shouldn't affect things, but this
   // doesn't really match with nsLineLayout.cpp's setting of
   // ZeroEffectiveSpanBox, anymore, so what should this really be?
   bool haveRight =
     border->GetComputedBorderWidth(NS_SIDE_RIGHT) != 0 ||
     !nsLayoutUtils::IsPaddingZero(padding->mPadding.GetRight()) ||
     !IsMarginZero(margin->mMargin.GetRight());
   bool haveLeft =
     border->GetComputedBorderWidth(NS_SIDE_LEFT) != 0 ||
     !nsLayoutUtils::IsPaddingZero(padding->mPadding.GetLeft()) ||
     !IsMarginZero(margin->mMargin.GetLeft());
   if (haveLeft || haveRight) {
     if (GetStateBits() & NS_FRAME_PART_OF_IBSPLIT) {
       bool haveStart, haveEnd;
       if (NS_STYLE_DIRECTION_LTR == StyleVisibility()->mDirection) {
         haveStart = haveLeft;
         haveEnd = haveRight;
       } else {
         haveStart = haveRight;
         haveEnd = haveLeft;
       }
       // For ib-split frames, ignore things we know we'll skip in GetSkipSides.
       // XXXbz should we be doing this for non-ib-split frames too, in a more
       // general way?
       // Get the first continuation eagerly, as a performance optimization, to
       // avoid having to get it twice..
       nsIFrame* firstCont = FirstContinuation();
       return
         (!haveStart || firstCont->FrameIsNonFirstInIBSplit()) &&
         (!haveEnd || firstCont->FrameIsNonLastInIBSplit());
     }
     return false;
   }
   return true;
 }
 bool
 nsInlineFrame::IsEmpty()
 {
   if (!IsSelfEmpty()) {
     return false;
   }
   for (nsIFrame *kid = mFrames.FirstChild(); kid; kid = kid->GetNextSibling()) {
     if (!kid->IsEmpty())
       return false;
   }
   return true;
 }
 nsIFrame::FrameSearchResult
 nsInlineFrame::PeekOffsetCharacter(bool aForward, int32_t* aOffset,
                                    bool aRespectClusters)
 {
   // Override the implementation in nsFrame, to skip empty inline frames
   NS_ASSERTION (aOffset && *aOffset <= 1, "aOffset out of range");
   int32_t startOffset = *aOffset;
   if (startOffset < 0)
     startOffset = 1;
   if (aForward == (startOffset == 0)) {
     // We're before the frame and moving forward, or after it and moving backwards:
     // skip to the other side, but keep going.
     *aOffset = 1 - startOffset;
   }
   return CONTINUE;
 }
 void
 nsInlineFrame::BuildDisplayList(nsDisplayListBuilder*   aBuilder,
                                 const nsRect&           aDirtyRect,
                                 const nsDisplayListSet& aLists)
 {
   BuildDisplayListForInline(aBuilder, aDirtyRect, aLists);
   // The sole purpose of this is to trigger display of the selection
   // window for Named Anchors, which don't have any children and
   // normally don't have any size, but in Editor we use CSS to display
   // an image to represent this "hidden" element.
   if (!mFrames.FirstChild()) {
     DisplaySelectionOverlay(aBuilder, aLists.Content());
   }
 }
 //////////////////////////////////////////////////////////////////////
 // Reflow methods
 /* virtual */ void
 nsInlineFrame::AddInlineMinWidth(nsRenderingContext *aRenderingContext,
                                  nsIFrame::InlineMinWidthData *aData)
 {
   DoInlineIntrinsicWidth(aRenderingContext, aData, nsLayoutUtils::MIN_WIDTH);
 }
 /* virtual */ void
 nsInlineFrame::AddInlinePrefWidth(nsRenderingContext *aRenderingContext,
                                   nsIFrame::InlinePrefWidthData *aData)
 {
   DoInlineIntrinsicWidth(aRenderingContext, aData, nsLayoutUtils::PREF_WIDTH);
 }
 /* virtual */ nsSize
 nsInlineFrame::ComputeSize(nsRenderingContext *aRenderingContext,
                            nsSize aCBSize, nscoord aAvailableWidth,
                            nsSize aMargin, nsSize aBorder, nsSize aPadding,
                            uint32_t aFlags)
 {
   // Inlines and text don't compute size before reflow.
   return nsSize(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
 }
 nsRect
 nsInlineFrame::ComputeTightBounds(gfxContext* aContext) const
 {
   // be conservative
   if (StyleContext()->HasTextDecorationLines()) {
     return GetVisualOverflowRect();
   }
   return ComputeSimpleTightBounds(aContext);
 }
 void
 nsInlineFrame::ReparentFloatsForInlineChild(nsIFrame* aOurLineContainer,
                                             nsIFrame* aFrame,
                                             bool aReparentSiblings)
 {
   // XXXbz this would be better if it took a nsFrameList or a frame
   // list slice....
   NS_ASSERTION(aOurLineContainer->GetNextContinuation() ||
                aOurLineContainer->GetPrevContinuation(),
                "Don't call this when we have no continuation, it's a waste");
   if (!aFrame) {
     NS_ASSERTION(aReparentSiblings, "Why did we get called?");
     return;
   }
   nsIFrame* ancestor = aFrame;
   do {
     ancestor = ancestor->GetParent();
     if (!ancestor)
       return;
   } while (!ancestor->IsFloatContainingBlock());
   if (ancestor == aOurLineContainer)
     return;
   nsBlockFrame* ourBlock = nsLayoutUtils::GetAsBlock(aOurLineContainer);
   NS_ASSERTION(ourBlock, "Not a block, but broke vertically?");
   nsBlockFrame* frameBlock = nsLayoutUtils::GetAsBlock(ancestor);
   NS_ASSERTION(frameBlock, "ancestor not a block");
   while (true) {
     ourBlock->ReparentFloats(aFrame, frameBlock, false);
     if (!aReparentSiblings)
       return;
     nsIFrame* next = aFrame->GetNextSibling();
     if (!next)
       return;
     if (next->GetParent() == aFrame->GetParent()) {
       aFrame = next;
       continue;
     }
     // This is paranoid and will hardly ever get hit ... but we can't actually
     // trust that the frames in the sibling chain all have the same parent,
     // because lazy reparenting may be going on. If we find a different
     // parent we need to redo our analysis.
     ReparentFloatsForInlineChild(aOurLineContainer, next, aReparentSiblings);
     return;
   }
 }
 static void
 ReparentChildListStyle(nsPresContext* aPresContext,
                        const nsFrameList::Slice& aFrames,
                        nsIFrame* aParentFrame)
 {
   RestyleManager* restyleManager = aPresContext->RestyleManager();
   for (nsFrameList::Enumerator e(aFrames); !e.AtEnd(); e.Next()) {
     NS_ASSERTION(e.get()->GetParent() == aParentFrame, "Bogus parentage");
     restyleManager->ReparentStyleContext(e.get());
     nsLayoutUtils::MarkDescendantsDirty(e.get());
   }
 }
 nsresult
 nsInlineFrame::Reflow(nsPresContext*          aPresContext,
                       nsHTMLReflowMetrics&     aMetrics,
                       const nsHTMLReflowState& aReflowState,
                       nsReflowStatus&          aStatus)
 {
   DO_GLOBAL_REFLOW_COUNT("nsInlineFrame");
   DISPLAY_REFLOW(aPresContext, this, aReflowState, aMetrics, aStatus);
   if (nullptr == aReflowState.mLineLayout) {
     return NS_ERROR_INVALID_ARG;
   }
   if (IsFrameTreeTooDeep(aReflowState, aMetrics, aStatus)) {
     return NS_OK;
   }
   bool    lazilySetParentPointer = false;
   nsIFrame* lineContainer = aReflowState.mLineLayout->LineContainerFrame();
    // Check for an overflow list with our prev-in-flow
   nsInlineFrame* prevInFlow = (nsInlineFrame*)GetPrevInFlow();
   if (prevInFlow) {
     AutoFrameListPtr prevOverflowFrames(aPresContext,
                                         prevInFlow->StealOverflowFrames());
     if (prevOverflowFrames) {
       // When pushing and pulling frames we need to check for whether any
       // views need to be reparented.
       nsContainerFrame::ReparentFrameViewList(*prevOverflowFrames, prevInFlow,
                                               this);
       // Check if we should do the lazilySetParentPointer optimization.
       // Only do it in simple cases where we're being reflowed for the
       // first time, nothing (e.g. bidi resolution) has already given
       // us children, and there's no next-in-flow, so all our frames
       // will be taken from prevOverflowFrames.
       if ((GetStateBits() & NS_FRAME_FIRST_REFLOW) && mFrames.IsEmpty() &&
           !GetNextInFlow()) {
         // If our child list is empty, just put the new frames into it.
         // Note that we don't set the parent pointer for the new frames. Instead wait
         // to do this until we actually reflow the frame. If the overflow list contains
         // thousands of frames this is a big performance issue (see bug #5588)
         mFrames.SetFrames(*prevOverflowFrames);
         lazilySetParentPointer = true;
       } else {
         // Assign all floats to our block if necessary
         if (lineContainer && lineContainer->GetPrevContinuation()) {
           ReparentFloatsForInlineChild(lineContainer,
                                        prevOverflowFrames->FirstChild(),
                                        true);
         }
         // Insert the new frames at the beginning of the child list
         // and set their parent pointer
         const nsFrameList::Slice& newFrames =
           mFrames.InsertFrames(this, nullptr, *prevOverflowFrames);
         // If our prev in flow was under the first continuation of a first-line
         // frame then we need to reparent the style contexts to remove the
         // the special first-line styling. In the lazilySetParentPointer case
         // we reparent the style contexts when we set their parents in
         // nsInlineFrame::ReflowFrames and nsInlineFrame::ReflowInlineFrame.
         if (aReflowState.mLineLayout->GetInFirstLine()) {
           ReparentChildListStyle(aPresContext, newFrames, this);
         }
       }
     }
   }
   // It's also possible that we have an overflow list for ourselves
 #ifdef DEBUG
   if (GetStateBits() & NS_FRAME_FIRST_REFLOW) {
     // If it's our initial reflow, then we should not have an overflow list.
     // However, add an assertion in case we get reflowed more than once with
     // the initial reflow reason
     nsFrameList* overflowFrames = GetOverflowFrames();
     NS_ASSERTION(!overflowFrames || overflowFrames->IsEmpty(),
                  "overflow list is not empty for initial reflow");
   }
 #endif
   if (!(GetStateBits() & NS_FRAME_FIRST_REFLOW)) {
     DrainFlags flags =
       lazilySetParentPointer ? eDontReparentFrames : DrainFlags(0);
     if (aReflowState.mLineLayout->GetInFirstLine()) {
       flags = DrainFlags(flags | eInFirstLine);
     }
     DrainSelfOverflowListInternal(flags, lineContainer);
   }
   // Set our own reflow state (additional state above and beyond
   // aReflowState)
   InlineReflowState irs;
   irs.mPrevFrame = nullptr;
   irs.mLineContainer = lineContainer;
   irs.mLineLayout = aReflowState.mLineLayout;
   irs.mNextInFlow = (nsInlineFrame*) GetNextInFlow();
   irs.mSetParentPointer = lazilySetParentPointer;
   nsresult rv;
   if (mFrames.IsEmpty()) {
     // Try to pull over one frame before starting so that we know
     // whether we have an anonymous block or not.
     bool complete;
     (void) PullOneFrame(aPresContext, irs, &complete);
   }
   rv = ReflowFrames(aPresContext, aReflowState, irs, aMetrics, aStatus);
   ReflowAbsoluteFrames(aPresContext, aMetrics, aReflowState, aStatus);
   // Note: the line layout code will properly compute our
   // overflow-rect state for us.
   NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aMetrics);
   return rv;
 }
 bool
 nsInlineFrame::DrainSelfOverflowListInternal(DrainFlags aFlags,
                                              nsIFrame* aLineContainer)
 {
   AutoFrameListPtr overflowFrames(PresContext(), StealOverflowFrames());
   if (overflowFrames) {
     NS_ASSERTION(mFrames.NotEmpty(), "overflow list w/o frames");
     // The frames on our own overflowlist may have been pushed by a
     // previous lazilySetParentPointer Reflow so we need to ensure the
     // correct parent pointer.  This is sometimes skipped by Reflow.
     if (!(aFlags & eDontReparentFrames)) {
       nsIFrame* firstChild = overflowFrames->FirstChild();
       if (aLineContainer && aLineContainer->GetPrevContinuation()) {
         ReparentFloatsForInlineChild(aLineContainer, firstChild, true);
       }
       const bool inFirstLine = (aFlags & eInFirstLine);
       RestyleManager* restyleManager = PresContext()->RestyleManager();
       for (nsIFrame* f = firstChild; f; f = f->GetNextSibling()) {
         f->SetParent(this);
         if (inFirstLine) {
           restyleManager->ReparentStyleContext(f);
           nsLayoutUtils::MarkDescendantsDirty(f);
         }
       }
     }
     bool result = !overflowFrames->IsEmpty();
     mFrames.AppendFrames(nullptr, *overflowFrames);
     return result;
   }
   return false;
 }
 /* virtual */ bool
 nsInlineFrame::DrainSelfOverflowList()
 {
   nsIFrame* lineContainer = nsLayoutUtils::FindNearestBlockAncestor(this);
   // Add the eInFirstLine flag if we have a ::first-line ancestor frame.
   // No need to look further than the nearest line container though.
   DrainFlags flags = DrainFlags(0);
   for (nsIFrame* p = GetParent(); p != lineContainer; p = p->GetParent()) {
     if (p->GetType() == nsGkAtoms::lineFrame) {
       flags = DrainFlags(flags | eInFirstLine);
       break;
     }
   }
   return DrainSelfOverflowListInternal(flags, lineContainer);
 }
 /* virtual */ bool
 nsInlineFrame::CanContinueTextRun() const
 {
   // We can continue a text run through an inline frame
   return true;
 }
 /* virtual */ void
 nsInlineFrame::PullOverflowsFromPrevInFlow()
 {
   nsInlineFrame* prevInFlow = static_cast<nsInlineFrame*>(GetPrevInFlow());
   if (prevInFlow) {
     nsPresContext* presContext = PresContext();
     AutoFrameListPtr prevOverflowFrames(presContext,
                                         prevInFlow->StealOverflowFrames());
     if (prevOverflowFrames) {
       // Assume that our prev-in-flow has the same line container that we do.
       nsContainerFrame::ReparentFrameViewList(*prevOverflowFrames, prevInFlow,
                                               this);
       mFrames.InsertFrames(this, nullptr, *prevOverflowFrames);
     }
   }
 }
 nsresult
 nsInlineFrame::ReflowFrames(nsPresContext* aPresContext,
                             const nsHTMLReflowState& aReflowState,
                             InlineReflowState& irs,
                             nsHTMLReflowMetrics& aMetrics,
                             nsReflowStatus& aStatus)
 {
   nsresult rv = NS_OK;
   aStatus = NS_FRAME_COMPLETE;
   nsLineLayout* lineLayout = aReflowState.mLineLayout;
   bool inFirstLine = aReflowState.mLineLayout->GetInFirstLine();
   RestyleManager* restyleManager = aPresContext->RestyleManager();
   WritingMode wm = aReflowState.GetWritingMode();
   nscoord startEdge = 0;
   // Don't offset by our start borderpadding if we have a prev continuation or
   // if we're in a part of an {ib} split other than the first one.
   if (!GetPrevContinuation() && !FrameIsNonFirstInIBSplit()) {
     startEdge = aReflowState.ComputedLogicalBorderPadding().IStart(wm);
   }
   nscoord availableISize = aReflowState.AvailableISize();
   NS_ASSERTION(availableISize != NS_UNCONSTRAINEDSIZE,
                "should no longer use available widths");
   // Subtract off inline axis border+padding from availableISize
   availableISize -= startEdge;
   availableISize -= aReflowState.ComputedLogicalBorderPadding().IEnd(wm);
   lineLayout->BeginSpan(this, &aReflowState, startEdge,
                         startEdge + availableISize, &mBaseline);
   // First reflow our principal children.
   nsIFrame* frame = mFrames.FirstChild();
   bool done = false;
   while (frame) {
     // Check if we should lazily set the child frame's parent pointer.
     if (irs.mSetParentPointer) {
       bool havePrevBlock =
         irs.mLineContainer && irs.mLineContainer->GetPrevContinuation();
       nsIFrame* child = frame;
       do {
         // If our block is the first in flow, then any floats under the pulled
         // frame must already belong to our block.
         if (havePrevBlock) {
           // This has to happen before we update frame's parent; we need to
           // know frame's ancestry under its old block.
           // The blockChildren.ContainsFrame check performed by
           // ReparentFloatsForInlineChild here may be slow, but we can't
           // easily avoid it because we don't know where 'frame' originally
           // came from. If we really really have to optimize this we could
           // cache whether frame->GetParent() is under its containing blocks
           // overflowList or not.
           ReparentFloatsForInlineChild(irs.mLineContainer, child, false);
         }
         child->SetParent(this);
         if (inFirstLine) {
           restyleManager->ReparentStyleContext(child);
           nsLayoutUtils::MarkDescendantsDirty(child);
         }
         // We also need to do the same for |frame|'s next-in-flows that are in
         // the sibling list. Otherwise, if we reflow |frame| and it's complete
         // we'll crash when trying to delete its next-in-flow.
         // This scenario doesn't happen often, but it can happen.
         nsIFrame* nextSibling = child->GetNextSibling();
         child = child->GetNextInFlow();
         if (MOZ_UNLIKELY(child)) {
           while (child != nextSibling && nextSibling) {
             nextSibling = nextSibling->GetNextSibling();
           }
           if (!nextSibling) {
             child = nullptr;
           }
         }
         MOZ_ASSERT(!child || mFrames.ContainsFrame(child));
       } while (child);
       // Fix the parent pointer for ::first-letter child frame next-in-flows,
       // so nsFirstLetterFrame::Reflow can destroy them safely (bug 401042).
       nsIFrame* realFrame = nsPlaceholderFrame::GetRealFrameFor(frame);
       if (realFrame->GetType() == nsGkAtoms::letterFrame) {
         nsIFrame* child = realFrame->GetFirstPrincipalChild();
         if (child) {
           NS_ASSERTION(child->GetType() == nsGkAtoms::textFrame,
                        "unexpected frame type");
           nsIFrame* nextInFlow = child->GetNextInFlow();
           for ( ; nextInFlow; nextInFlow = nextInFlow->GetNextInFlow()) {
             NS_ASSERTION(nextInFlow->GetType() == nsGkAtoms::textFrame,
                          "unexpected frame type");
             if (mFrames.ContainsFrame(nextInFlow)) {
               nextInFlow->SetParent(this);
               if (inFirstLine) {
                 restyleManager->ReparentStyleContext(nextInFlow);
                 nsLayoutUtils::MarkDescendantsDirty(nextInFlow);
               }
             }
             else {
 #ifdef DEBUG
               // Once we find a next-in-flow that isn't ours none of the
               // remaining next-in-flows should be either.
               for ( ; nextInFlow; nextInFlow = nextInFlow->GetNextInFlow()) {
                 NS_ASSERTION(!mFrames.ContainsFrame(nextInFlow),
                              "unexpected letter frame flow");
               }
 #endif
               break;
             }
           }
         }
       }
     }
     MOZ_ASSERT(frame->GetParent() == this);
     if (!done) {
       bool reflowingFirstLetter = lineLayout->GetFirstLetterStyleOK();
       rv = ReflowInlineFrame(aPresContext, aReflowState, irs, frame, aStatus);
       done = NS_FAILED(rv) ||
              NS_INLINE_IS_BREAK(aStatus) ||
              (!reflowingFirstLetter && NS_FRAME_IS_NOT_COMPLETE(aStatus));
       if (done) {
         if (!irs.mSetParentPointer) {
           break;
         }
         // Keep reparenting the remaining siblings, but don't reflow them.
         nsFrameList* pushedFrames = GetOverflowFrames();
         if (pushedFrames && pushedFrames->FirstChild() == frame) {
           // Don't bother if |frame| was pushed to our overflow list.
           break;
         }
       } else {
         irs.mPrevFrame = frame;
       }
     }
     frame = frame->GetNextSibling();
   }
   // Attempt to pull frames from our next-in-flow until we can't
   if (!done && GetNextInFlow()) {
     while (true) {
       bool reflowingFirstLetter = lineLayout->GetFirstLetterStyleOK();
       bool isComplete;
       if (!frame) { // Could be non-null if we pulled a first-letter frame and
                     // it created a continuation, since we don't push those.
         frame = PullOneFrame(aPresContext, irs, &isComplete);
       }
 #ifdef NOISY_PUSHING
       printf("%p pulled up %p\n", this, frame);
 #endif
       if (nullptr == frame) {
         if (!isComplete) {
           aStatus = NS_FRAME_NOT_COMPLETE;
         }
         break;
       }
       rv = ReflowInlineFrame(aPresContext, aReflowState, irs, frame, aStatus);
       if (NS_FAILED(rv) ||
           NS_INLINE_IS_BREAK(aStatus) ||
           (!reflowingFirstLetter && NS_FRAME_IS_NOT_COMPLETE(aStatus))) {
         break;
       }
       irs.mPrevFrame = frame;
       frame = frame->GetNextSibling();
     }
   }
   NS_ASSERTION(!NS_FRAME_IS_COMPLETE(aStatus) || !GetOverflowFrames(),
                "We can't be complete AND have overflow frames!");
   // If after reflowing our children they take up no area then make
   // sure that we don't either.
   //
   // Note: CSS demands that empty inline elements still affect the
   // line-height calculations. However, continuations of an inline
   // that are empty we force to empty so that things like collapsed
   // whitespace in an inline element don't affect the line-height.
   aMetrics.ISize() = lineLayout->EndSpan(this);
   // Compute final width.
   // Make sure to not include our start border and padding if we have a prev
   // continuation or if we're in a part of an {ib} split other than the first
   // one.
   if (!GetPrevContinuation() && !FrameIsNonFirstInIBSplit()) {
     aMetrics.ISize() += aReflowState.ComputedLogicalBorderPadding().IStart(wm);
   }
   /*
    * We want to only apply the end border and padding if we're the last
    * continuation and either not in an {ib} split or the last part of it.  To
    * be the last continuation we have to be complete (so that we won't get a
    * next-in-flow) and have no non-fluid continuations on our continuation
    * chain.
    */
   if (NS_FRAME_IS_COMPLETE(aStatus) &&
       !LastInFlow()->GetNextContinuation() &&
       !FrameIsNonLastInIBSplit()) {
     aMetrics.Width() += aReflowState.ComputedLogicalBorderPadding().IEnd(wm);
   }
   nsRefPtr<nsFontMetrics> fm;
   float inflation = nsLayoutUtils::FontSizeInflationFor(this);
   nsLayoutUtils::GetFontMetricsForFrame(this, getter_AddRefs(fm), inflation);
   aReflowState.rendContext->SetFont(fm);
   if (fm) {
     // Compute final height of the frame.
     //
     // Do things the standard css2 way -- though it's hard to find it
     // in the css2 spec! It's actually found in the css1 spec section
     // 4.4 (you will have to read between the lines to really see
     // it).
     //
     // The height of our box is the sum of our font size plus the top
     // and bottom border and padding. The height of children do not
     // affect our height.
     aMetrics.SetTopAscent(fm->MaxAscent());
     aMetrics.Height() = fm->MaxHeight();
   } else {
     NS_WARNING("Cannot get font metrics - defaulting sizes to 0");
     aMetrics.SetTopAscent(aMetrics.Height() = 0);
   }
   aMetrics.SetTopAscent(aMetrics.TopAscent() + aReflowState.ComputedPhysicalBorderPadding().top);
   aMetrics.Height() += aReflowState.ComputedPhysicalBorderPadding().top +
     aReflowState.ComputedPhysicalBorderPadding().bottom;
   // For now our overflow area is zero. The real value will be
   // computed in |nsLineLayout::RelativePositionFrames|.
   aMetrics.mOverflowAreas.Clear();
 #ifdef NOISY_FINAL_SIZE
   ListTag(stdout);
   printf(": metrics=%d,%d ascent=%d\n",
          aMetrics.Width(), aMetrics.Height(), aMetrics.TopAscent());
 #endif
   return rv;
 }
 nsresult
 nsInlineFrame::ReflowInlineFrame(nsPresContext* aPresContext,
                                  const nsHTMLReflowState& aReflowState,
                                  InlineReflowState& irs,
                                  nsIFrame* aFrame,
                                  nsReflowStatus& aStatus)
 {
   nsLineLayout* lineLayout = aReflowState.mLineLayout;
   bool reflowingFirstLetter = lineLayout->GetFirstLetterStyleOK();
   bool pushedFrame;
   nsresult rv =
     lineLayout->ReflowFrame(aFrame, aStatus, nullptr, pushedFrame);
   if (NS_FAILED(rv)) {
     return rv;
   }
   if (NS_INLINE_IS_BREAK_BEFORE(aStatus)) {
     if (aFrame != mFrames.FirstChild()) {
       // Change break-before status into break-after since we have
       // already placed at least one child frame. This preserves the
       // break-type so that it can be propagated upward.
       aStatus = NS_FRAME_NOT_COMPLETE |
         NS_INLINE_BREAK | NS_INLINE_BREAK_AFTER |
         (aStatus & NS_INLINE_BREAK_TYPE_MASK);
       PushFrames(aPresContext, aFrame, irs.mPrevFrame, irs);
     }
     else {
       // Preserve reflow status when breaking-before our first child
       // and propagate it upward without modification.
     }
     return NS_OK;
   }
   // Create a next-in-flow if needed.
   if (!NS_FRAME_IS_FULLY_COMPLETE(aStatus)) {
     nsIFrame* newFrame;
     rv = CreateNextInFlow(aFrame, newFrame);
     if (NS_FAILED(rv)) {
       return rv;
     }
   }
   if (NS_INLINE_IS_BREAK_AFTER(aStatus)) {
     nsIFrame* nextFrame = aFrame->GetNextSibling();
     if (nextFrame) {
       NS_FRAME_SET_INCOMPLETE(aStatus);
       PushFrames(aPresContext, nextFrame, aFrame, irs);
     }
     else {
       // We must return an incomplete status if there are more child
       // frames remaining in a next-in-flow that follows this frame.
       nsInlineFrame* nextInFlow = static_cast<nsInlineFrame*>(GetNextInFlow());
       while (nextInFlow) {
         if (nextInFlow->mFrames.NotEmpty()) {
           NS_FRAME_SET_INCOMPLETE(aStatus);
           break;
         }
         nextInFlow = static_cast<nsInlineFrame*>(nextInFlow->GetNextInFlow());
       }
     }
     return NS_OK;
   }
   if (!NS_FRAME_IS_FULLY_COMPLETE(aStatus) && !reflowingFirstLetter) {
     nsIFrame* nextFrame = aFrame->GetNextSibling();
     if (nextFrame) {
       PushFrames(aPresContext, nextFrame, aFrame, irs);
     }
   }
   return NS_OK;
 }
 nsIFrame*
 nsInlineFrame::PullOneFrame(nsPresContext* aPresContext,
                             InlineReflowState& irs,
                             bool* aIsComplete)
 {
   bool isComplete = true;
   nsIFrame* frame = nullptr;
   nsInlineFrame* nextInFlow = irs.mNextInFlow;
   while (nextInFlow) {
     frame = nextInFlow->mFrames.FirstChild();
     if (!frame) {
       // The nextInFlow's principal list has no frames, try its overflow list.
       nsFrameList* overflowFrames = nextInFlow->GetOverflowFrames();
       if (overflowFrames) {
         frame = overflowFrames->RemoveFirstChild();
         if (overflowFrames->IsEmpty()) {
           // We're stealing the only frame - delete the overflow list.
           nextInFlow->DestroyOverflowList();
         } else {
           // We leave the remaining frames on the overflow list (rather than
           // putting them on nextInFlow's principal list) so we don't have to
           // set up the parent for them.
         }
         // ReparentFloatsForInlineChild needs it to be on a child list -
         // we remove it again below.
         nextInFlow->mFrames.SetFrames(frame);
       }
     }
     if (frame) {
       // If our block has no next continuation, then any floats belonging to
       // the pulled frame must belong to our block already. This check ensures
       // we do no extra work in the common non-vertical-breaking case.
       if (irs.mLineContainer && irs.mLineContainer->GetNextContinuation()) {
         // The blockChildren.ContainsFrame check performed by
         // ReparentFloatsForInlineChild will be fast because frame's ancestor
         // will be the first child of its containing block.
         ReparentFloatsForInlineChild(irs.mLineContainer, frame, false);
       }
       nextInFlow->mFrames.RemoveFirstChild();
       // nsFirstLineFrame::PullOneFrame calls ReparentStyleContext.
       mFrames.InsertFrame(this, irs.mPrevFrame, frame);
       isComplete = false;
       if (irs.mLineLayout) {
         irs.mLineLayout->SetDirtyNextLine();
       }
       nsContainerFrame::ReparentFrameView(frame, nextInFlow, this);
       break;
     }
     nextInFlow = static_cast<nsInlineFrame*>(nextInFlow->GetNextInFlow());
     irs.mNextInFlow = nextInFlow;
   }
   *aIsComplete = isComplete;
   return frame;
 }
 void
 nsInlineFrame::PushFrames(nsPresContext* aPresContext,
                           nsIFrame* aFromChild,
                           nsIFrame* aPrevSibling,
                           InlineReflowState& aState)
 {
   NS_PRECONDITION(aFromChild, "null pointer");
   NS_PRECONDITION(aPrevSibling, "pushing first child");
   NS_PRECONDITION(aPrevSibling->GetNextSibling() == aFromChild, "bad prev sibling");
 #ifdef NOISY_PUSHING
   printf("%p pushing aFromChild %p, disconnecting from prev sib %p\n",
          this, aFromChild, aPrevSibling);
 #endif
   // Add the frames to our overflow list (let our next in flow drain
   // our overflow list when it is ready)
   SetOverflowFrames(mFrames.RemoveFramesAfter(aPrevSibling));
   if (aState.mLineLayout) {
     aState.mLineLayout->SetDirtyNextLine();
   }
 }
 //////////////////////////////////////////////////////////////////////
 int
 nsInlineFrame::GetLogicalSkipSides(const nsHTMLReflowState* aReflowState) const
 {
   int skip = 0;
   if (!IsFirst()) {
     nsInlineFrame* prev = (nsInlineFrame*) GetPrevContinuation();
     if ((GetStateBits() & NS_INLINE_FRAME_BIDI_VISUAL_STATE_IS_SET) ||
         (prev && (prev->mRect.height || prev->mRect.width))) {
       // Prev continuation is not empty therefore we don't render our start
       // border edge.
       skip |= LOGICAL_SIDE_I_START;
     }
     else {
       // If the prev continuation is empty, then go ahead and let our start
       // edge border render.
     }
   }
   if (!IsLast()) {
     nsInlineFrame* next = (nsInlineFrame*) GetNextContinuation();
     if ((GetStateBits() & NS_INLINE_FRAME_BIDI_VISUAL_STATE_IS_SET) ||
         (next && (next->mRect.height || next->mRect.width))) {
       // Next continuation is not empty therefore we don't render our end
       // border edge.
       skip |= LOGICAL_SIDE_I_END;
     }
     else {
       // If the next continuation is empty, then go ahead and let our end
       // edge border render.
     }
   }
   if (GetStateBits() & NS_FRAME_PART_OF_IBSPLIT) {
     // All but the last part of an {ib} split should skip the "end" side (as
     // determined by this frame's direction) and all but the first part of such
     // a split should skip the "start" side.  But figuring out which part of
     // the split we are involves getting our first continuation, which might be
     // expensive.  So don't bother if we already have the relevant bits set.
     if (skip != LOGICAL_SIDES_I_BOTH) {
       // We're missing one of the skip bits, so check whether we need to set it.
       // Only get the first continuation once, as an optimization.
       nsIFrame* firstContinuation = FirstContinuation();
       if (firstContinuation->FrameIsNonLastInIBSplit()) {
         skip |= LOGICAL_SIDE_I_END;
       }
       if (firstContinuation->FrameIsNonFirstInIBSplit()) {
         skip |= LOGICAL_SIDE_I_START;
       }
     }
   }
   return skip;
 }
 nscoord
 nsInlineFrame::GetBaseline() const
 {
   return mBaseline;
 }
 #ifdef ACCESSIBILITY
 a11y::AccType
 nsInlineFrame::AccessibleType()
 {
   // Broken image accessibles are created here, because layout
   // replaces the image or image control frame with an inline frame
   nsIAtom *tagAtom = mContent->Tag();
   if (tagAtom == nsGkAtoms::input)  // Broken <input type=image ... />
     return a11y::eHTMLButtonType;
   if (tagAtom == nsGkAtoms::img)  // Create accessible for broken <img>
     return a11y::eHyperTextType;
   return a11y::eNoType;
 }
 #endif
 //////////////////////////////////////////////////////////////////////
 // nsLineFrame implementation
 nsIFrame*
 NS_NewFirstLineFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
 {
   return new (aPresShell) nsFirstLineFrame(aContext);
 }
 NS_IMPL_FRAMEARENA_HELPERS(nsFirstLineFrame)
 void
 nsFirstLineFrame::Init(nsIContent* aContent, nsIFrame* aParent,
                        nsIFrame* aPrevInFlow)
 {
   nsInlineFrame::Init(aContent, aParent, aPrevInFlow);
   if (!aPrevInFlow) {
     MOZ_ASSERT(StyleContext()->GetPseudo() == nsCSSPseudoElements::firstLine);
     return;
   }
   // This frame is a continuation - fixup the style context if aPrevInFlow
   // is the first-in-flow (the only one with a ::first-line pseudo).
   if (aPrevInFlow->StyleContext()->GetPseudo() == nsCSSPseudoElements::firstLine) {
     MOZ_ASSERT(FirstInFlow() == aPrevInFlow);
     // Create a new style context that is a child of the parent
     // style context thus removing the ::first-line style. This way
     // we behave as if an anonymous (unstyled) span was the child
     // of the parent frame.
     nsStyleContext* parentContext = aParent->StyleContext();
     nsRefPtr<nsStyleContext> newSC = PresContext()->StyleSet()->
       ResolveAnonymousBoxStyle(nsCSSAnonBoxes::mozLineFrame, parentContext);
     SetStyleContext(newSC);
   } else {
     MOZ_ASSERT(FirstInFlow() != aPrevInFlow);
     MOZ_ASSERT(aPrevInFlow->StyleContext()->GetPseudo() ==
                  nsCSSAnonBoxes::mozLineFrame);
   }
 }
 #ifdef DEBUG_FRAME_DUMP
 nsresult
 nsFirstLineFrame::GetFrameName(nsAString& aResult) const
 {
   return MakeFrameName(NS_LITERAL_STRING("Line"), aResult);
 }
 #endif
 nsIAtom*
 nsFirstLineFrame::GetType() const
 {
   return nsGkAtoms::lineFrame;
 }
 nsIFrame*
 nsFirstLineFrame::PullOneFrame(nsPresContext* aPresContext, InlineReflowState& irs,
                                bool* aIsComplete)
 {
   nsIFrame* frame = nsInlineFrame::PullOneFrame(aPresContext, irs, aIsComplete);
   if (frame && !GetPrevInFlow()) {
     // We are a first-line frame. Fixup the child frames
     // style-context that we just pulled.
     NS_ASSERTION(frame->GetParent() == this, "Incorrect parent?");
     aPresContext->RestyleManager()->ReparentStyleContext(frame);
     nsLayoutUtils::MarkDescendantsDirty(frame);
   }
   return frame;
 }
 nsresult
 nsFirstLineFrame::Reflow(nsPresContext* aPresContext,
                          nsHTMLReflowMetrics& aMetrics,
                          const nsHTMLReflowState& aReflowState,
                          nsReflowStatus& aStatus)
 {
   if (nullptr == aReflowState.mLineLayout) {
     return NS_ERROR_INVALID_ARG;
   }
   nsIFrame* lineContainer = aReflowState.mLineLayout->LineContainerFrame();
   // Check for an overflow list with our prev-in-flow
   nsFirstLineFrame* prevInFlow = (nsFirstLineFrame*)GetPrevInFlow();
   if (prevInFlow) {
     AutoFrameListPtr prevOverflowFrames(aPresContext,
                                         prevInFlow->StealOverflowFrames());
     if (prevOverflowFrames) {
       // Assign all floats to our block if necessary
       if (lineContainer && lineContainer->GetPrevContinuation()) {
         ReparentFloatsForInlineChild(lineContainer,
                                      prevOverflowFrames->FirstChild(),
                                      true);
       }
       const nsFrameList::Slice& newFrames =
         mFrames.InsertFrames(this, nullptr, *prevOverflowFrames);
       ReparentChildListStyle(aPresContext, newFrames, this);
     }
   }
   // It's also possible that we have an overflow list for ourselves.
   DrainSelfOverflowList();
   // Set our own reflow state (additional state above and beyond
   // aReflowState)
   InlineReflowState irs;
   irs.mPrevFrame = nullptr;
   irs.mLineContainer = lineContainer;
   irs.mLineLayout = aReflowState.mLineLayout;
   irs.mNextInFlow = (nsInlineFrame*) GetNextInFlow();
   nsresult rv;
   bool wasEmpty = mFrames.IsEmpty();
   if (wasEmpty) {
     // Try to pull over one frame before starting so that we know
     // whether we have an anonymous block or not.
     bool complete;
     PullOneFrame(aPresContext, irs, &complete);
   }
   if (nullptr == GetPrevInFlow()) {
     // XXX This is pretty sick, but what we do here is to pull-up, in
     // advance, all of the next-in-flows children. We re-resolve their
     // style while we are at at it so that when we reflow they have
     // the right style.
     //
     // All of this is so that text-runs reflow properly.
     irs.mPrevFrame = mFrames.LastChild();
     for (;;) {
       bool complete;
       nsIFrame* frame = PullOneFrame(aPresContext, irs, &complete);
       if (!frame) {
         break;
       }
       irs.mPrevFrame = frame;
     }
     irs.mPrevFrame = nullptr;
   }
   NS_ASSERTION(!aReflowState.mLineLayout->GetInFirstLine(),
                "Nested first-line frames? BOGUS");
   aReflowState.mLineLayout->SetInFirstLine(true);
   rv = ReflowFrames(aPresContext, aReflowState, irs, aMetrics, aStatus);
   aReflowState.mLineLayout->SetInFirstLine(false);
   ReflowAbsoluteFrames(aPresContext, aMetrics, aReflowState, aStatus);
   // Note: the line layout code will properly compute our overflow state for us
   return rv;
 }
 /* virtual */ void
 nsFirstLineFrame::PullOverflowsFromPrevInFlow()
 {
   nsFirstLineFrame* prevInFlow = static_cast<nsFirstLineFrame*>(GetPrevInFlow());
   if (prevInFlow) {
     nsPresContext* presContext = PresContext();
     AutoFrameListPtr prevOverflowFrames(presContext,
                                         prevInFlow->StealOverflowFrames());
     if (prevOverflowFrames) {
       // Assume that our prev-in-flow has the same line container that we do.
       const nsFrameList::Slice& newFrames =
         mFrames.InsertFrames(this, nullptr, *prevOverflowFrames);
       ReparentChildListStyle(presContext, newFrames, this);
     }
   }
 }
 /* virtual */ bool
 nsFirstLineFrame::DrainSelfOverflowList()
 {
   AutoFrameListPtr overflowFrames(PresContext(), StealOverflowFrames());
   if (overflowFrames) {
     NS_ASSERTION(mFrames.NotEmpty(), "overflow list w/o frames");
     bool result = !overflowFrames->IsEmpty();
     const nsFrameList::Slice& newFrames =
       mFrames.AppendFrames(nullptr, *overflowFrames);
     ReparentChildListStyle(PresContext(), newFrames, this);
     return result;
   }
   return false;
 }

The Tor Browser / annotate

layout/generic/nsInlineFrame.cpp@6474c204b198 (annotated)

layout/generic/nsInlineFrame.cpp