The Tor Browser: layout/tables/nsTableCellFrame.cpp@97036ab72558 (annotated)

layout/tables/nsTableCellFrame.cpp@97036ab72558 (annotated)

layout/tables/nsTableCellFrame.cpp

Tue, 06 Jan 2015 21:39:09 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Tue, 06 Jan 2015 21:39:09 +0100
branch: TOR_BUG_9701
changeset 8: 97036ab72558
permissions: -rw-r--r--

Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

 /* -*- 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/. */
 #include "nsTableFrame.h"
 #include "nsTableColFrame.h"
 #include "nsTableCellFrame.h"
 #include "nsTableRowFrame.h"
 #include "nsTableRowGroupFrame.h"
 #include "nsTablePainter.h"
 #include "nsStyleContext.h"
 #include "nsStyleConsts.h"
 #include "nsPresContext.h"
 #include "nsRenderingContext.h"
 #include "nsCSSRendering.h"
 #include "nsIContent.h"
 #include "nsGenericHTMLElement.h"
 #include "nsAttrValueInlines.h"
 #include "nsHTMLParts.h"
 #include "nsGkAtoms.h"
 #include "nsIPresShell.h"
 #include "nsCOMPtr.h"
 #include "nsIServiceManager.h"
 #include "nsIDOMNode.h"
 #include "nsNameSpaceManager.h"
 #include "nsDisplayList.h"
 #include "nsLayoutUtils.h"
 #include "nsTextFrame.h"
 #include "FrameLayerBuilder.h"
 #include <algorithm>
 //TABLECELL SELECTION
 #include "nsFrameSelection.h"
 #include "mozilla/LookAndFeel.h"
 using namespace mozilla;
 nsTableCellFrame::nsTableCellFrame(nsStyleContext* aContext) :
   nsContainerFrame(aContext)
 {
   mColIndex = 0;
   mPriorAvailWidth = 0;
   SetContentEmpty(false);
   SetHasPctOverHeight(false);
 }
 nsTableCellFrame::~nsTableCellFrame()
 {
 }
 NS_IMPL_FRAMEARENA_HELPERS(nsTableCellFrame)
 nsTableCellFrame*
 nsTableCellFrame::GetNextCell() const
 {
   nsIFrame* childFrame = GetNextSibling();
   while (childFrame) {
     nsTableCellFrame *cellFrame = do_QueryFrame(childFrame);
     if (cellFrame) {
       return cellFrame;
     }
     childFrame = childFrame->GetNextSibling();
   }
   return nullptr;
 }
 void
 nsTableCellFrame::Init(nsIContent*      aContent,
                        nsIFrame*        aParent,
                        nsIFrame*        aPrevInFlow)
 {
   // Let the base class do its initialization
   nsContainerFrame::Init(aContent, aParent, aPrevInFlow);
   if (GetStateBits() & NS_FRAME_FONT_INFLATION_CONTAINER) {
     AddStateBits(NS_FRAME_FONT_INFLATION_FLOW_ROOT);
   }
   if (aPrevInFlow) {
     // Set the column index
     nsTableCellFrame* cellFrame = (nsTableCellFrame*)aPrevInFlow;
     int32_t           colIndex;
     cellFrame->GetColIndex(colIndex);
     SetColIndex(colIndex);
   }
 }
 void
 nsTableCellFrame::DestroyFrom(nsIFrame* aDestructRoot)
 {
   if (GetStateBits() & NS_FRAME_CAN_HAVE_ABSPOS_CHILDREN) {
     nsTableFrame::UnregisterPositionedTablePart(this, aDestructRoot);
   }
   nsContainerFrame::DestroyFrom(aDestructRoot);
 }
 // nsIPercentHeightObserver methods
 void
 nsTableCellFrame::NotifyPercentHeight(const nsHTMLReflowState& aReflowState)
 {
   // nsHTMLReflowState ensures the mCBReflowState of blocks inside a
   // cell is the cell frame, not the inner-cell block, and that the
   // containing block of an inner table is the containing block of its
   // outer table.
   // XXXldb Given the now-stricter |NeedsToObserve|, many if not all of
   // these tests are probably unnecessary.
   // Maybe the cell reflow state; we sure if we're inside the |if|.
   const nsHTMLReflowState *cellRS = aReflowState.mCBReflowState;
   if (cellRS && cellRS->frame == this &&
       (cellRS->ComputedHeight() == NS_UNCONSTRAINEDSIZE ||
        cellRS->ComputedHeight() == 0)) { // XXXldb Why 0?
     // This is a percentage height on a frame whose percentage heights
     // are based on the height of the cell, since its containing block
     // is the inner cell frame.
     // We'll only honor the percent height if sibling-cells/ancestors
     // have specified/pct height. (Also, siblings only count for this if
     // both this cell and the sibling cell span exactly 1 row.)
     if (nsTableFrame::AncestorsHaveStyleHeight(*cellRS) ||
         (nsTableFrame::GetTableFrame(this)->GetEffectiveRowSpan(*this) == 1 &&
          (cellRS->parentReflowState->frame->GetStateBits() &
           NS_ROW_HAS_CELL_WITH_STYLE_HEIGHT))) {
       for (const nsHTMLReflowState *rs = aReflowState.parentReflowState;
            rs != cellRS;
            rs = rs->parentReflowState) {
         rs->frame->AddStateBits(NS_FRAME_CONTAINS_RELATIVE_HEIGHT);
       }
       nsTableFrame::RequestSpecialHeightReflow(*cellRS);
     }
   }
 }
 // The cell needs to observe its block and things inside its block but nothing below that
 bool
 nsTableCellFrame::NeedsToObserve(const nsHTMLReflowState& aReflowState)
 {
   const nsHTMLReflowState *rs = aReflowState.parentReflowState;
   if (!rs)
     return false;
   if (rs->frame == this) {
     // We always observe the child block.  It will never send any
     // notifications, but we need this so that the observer gets
     // propagated to its kids.
     return true;
   }
   rs = rs->parentReflowState;
   if (!rs) {
     return false;
   }
   // We always need to let the percent height observer be propagated
   // from an outer table frame to an inner table frame.
   nsIAtom *fType = aReflowState.frame->GetType();
   if (fType == nsGkAtoms::tableFrame) {
     return true;
   }
   // We need the observer to be propagated to all children of the cell
   // (i.e., children of the child block) in quirks mode, but only to
   // tables in standards mode.
   return rs->frame == this &&
          (PresContext()->CompatibilityMode() == eCompatibility_NavQuirks ||
           fType == nsGkAtoms::tableOuterFrame);
 }
 nsresult
 nsTableCellFrame::GetRowIndex(int32_t &aRowIndex) const
 {
   nsresult result;
   nsTableRowFrame* row = static_cast<nsTableRowFrame*>(GetParent());
   if (row) {
     aRowIndex = row->GetRowIndex();
     result = NS_OK;
   }
   else {
     aRowIndex = 0;
     result = NS_ERROR_NOT_INITIALIZED;
   }
   return result;
 }
 nsresult
 nsTableCellFrame::GetColIndex(int32_t &aColIndex) const
 {
   if (GetPrevInFlow()) {
     return static_cast<nsTableCellFrame*>(FirstInFlow())->GetColIndex(aColIndex);
   }
   else {
     aColIndex = mColIndex;
     return  NS_OK;
   }
 }
 nsresult
 nsTableCellFrame::AttributeChanged(int32_t         aNameSpaceID,
                                    nsIAtom*        aAttribute,
                                    int32_t         aModType)
 {
   // We need to recalculate in this case because of the nowrap quirk in
   // BasicTableLayoutStrategy
   if (aNameSpaceID == kNameSpaceID_None && aAttribute == nsGkAtoms::nowrap &&
       PresContext()->CompatibilityMode() == eCompatibility_NavQuirks) {
     PresContext()->PresShell()->
       FrameNeedsReflow(this, nsIPresShell::eTreeChange, NS_FRAME_IS_DIRTY);
   }
   // let the table frame decide what to do
   nsTableFrame* tableFrame = nsTableFrame::GetTableFrame(this);
   tableFrame->AttributeChangedFor(this, mContent, aAttribute);
   return NS_OK;
 }
 /* virtual */ void
 nsTableCellFrame::DidSetStyleContext(nsStyleContext* aOldStyleContext)
 {
   nsContainerFrame::DidSetStyleContext(aOldStyleContext);
   if (!aOldStyleContext) //avoid this on init
     return;
   nsTableFrame* tableFrame = nsTableFrame::GetTableFrame(this);
   if (tableFrame->IsBorderCollapse() &&
       tableFrame->BCRecalcNeeded(aOldStyleContext, StyleContext())) {
     int32_t colIndex, rowIndex;
     GetColIndex(colIndex);
     GetRowIndex(rowIndex);
     // row span needs to be clamped as we do not create rows in the cellmap
     // which do not have cells originating in them
     nsIntRect damageArea(colIndex, rowIndex, GetColSpan(),
       std::min(GetRowSpan(), tableFrame->GetRowCount() - rowIndex));
     tableFrame->AddBCDamageArea(damageArea);
   }
 }
 nsresult
 nsTableCellFrame::AppendFrames(ChildListID     aListID,
                                nsFrameList&    aFrameList)
 {
   NS_PRECONDITION(false, "unsupported operation");
   return NS_ERROR_NOT_IMPLEMENTED;
 }
 nsresult
 nsTableCellFrame::InsertFrames(ChildListID     aListID,
                                nsIFrame*       aPrevFrame,
                                nsFrameList&    aFrameList)
 {
   NS_PRECONDITION(false, "unsupported operation");
   return NS_ERROR_NOT_IMPLEMENTED;
 }
 nsresult
 nsTableCellFrame::RemoveFrame(ChildListID     aListID,
                               nsIFrame*       aOldFrame)
 {
   NS_PRECONDITION(false, "unsupported operation");
   return NS_ERROR_NOT_IMPLEMENTED;
 }
 void nsTableCellFrame::SetColIndex(int32_t aColIndex)
 {
   mColIndex = aColIndex;
 }
 /* virtual */ nsMargin
 nsTableCellFrame::GetUsedMargin() const
 {
   return nsMargin(0,0,0,0);
 }
 //ASSURE DIFFERENT COLORS for selection
 inline nscolor EnsureDifferentColors(nscolor colorA, nscolor colorB)
 {
     if (colorA == colorB)
     {
       nscolor res;
       res = NS_RGB(NS_GET_R(colorA) ^ 0xff,
                    NS_GET_G(colorA) ^ 0xff,
                    NS_GET_B(colorA) ^ 0xff);
       return res;
     }
     return colorA;
 }
 void
 nsTableCellFrame::DecorateForSelection(nsRenderingContext& aRenderingContext,
                                        nsPoint aPt)
 {
   NS_ASSERTION(IsSelected(), "Should only be called for selected cells");
   int16_t displaySelection;
   nsPresContext* presContext = PresContext();
   displaySelection = DisplaySelection(presContext);
   if (displaySelection) {
     nsRefPtr<nsFrameSelection> frameSelection =
       presContext->PresShell()->FrameSelection();
     if (frameSelection->GetTableCellSelection()) {
       nscolor       bordercolor;
       if (displaySelection == nsISelectionController::SELECTION_DISABLED) {
         bordercolor = NS_RGB(176,176,176);// disabled color
       }
       else {
         bordercolor =
           LookAndFeel::GetColor(LookAndFeel::eColorID_TextSelectBackground);
       }
       nscoord threePx = nsPresContext::CSSPixelsToAppUnits(3);
       if ((mRect.width > threePx) && (mRect.height > threePx))
       {
         //compare bordercolor to ((nsStyleColor *)myColor)->mBackgroundColor)
         bordercolor = EnsureDifferentColors(bordercolor,
                                             StyleBackground()->mBackgroundColor);
         nsRenderingContext::AutoPushTranslation
             translate(&aRenderingContext, aPt);
         nscoord onePixel = nsPresContext::CSSPixelsToAppUnits(1);
         aRenderingContext.SetColor(bordercolor);
         aRenderingContext.DrawLine(onePixel, 0, mRect.width, 0);
         aRenderingContext.DrawLine(0, onePixel, 0, mRect.height);
         aRenderingContext.DrawLine(onePixel, mRect.height, mRect.width, mRect.height);
         aRenderingContext.DrawLine(mRect.width, onePixel, mRect.width, mRect.height);
         //middle
         aRenderingContext.DrawRect(onePixel, onePixel, mRect.width-onePixel,
                                    mRect.height-onePixel);
         //shading
         aRenderingContext.DrawLine(2*onePixel, mRect.height-2*onePixel,
                                    mRect.width-onePixel, mRect.height- (2*onePixel));
         aRenderingContext.DrawLine(mRect.width - (2*onePixel), 2*onePixel,
                                    mRect.width - (2*onePixel), mRect.height-onePixel);
       }
     }
   }
 }
 void
 nsTableCellFrame::PaintBackground(nsRenderingContext& aRenderingContext,
                                   const nsRect&        aDirtyRect,
                                   nsPoint              aPt,
                                   uint32_t             aFlags)
 {
   nsRect rect(aPt, GetSize());
   nsCSSRendering::PaintBackground(PresContext(), aRenderingContext, this,
                                   aDirtyRect, rect, aFlags);
 }
 // Called by nsTablePainter
 void
 nsTableCellFrame::PaintCellBackground(nsRenderingContext& aRenderingContext,
                                       const nsRect& aDirtyRect, nsPoint aPt,
                                       uint32_t aFlags)
 {
   if (!StyleVisibility()->IsVisible())
     return;
   PaintBackground(aRenderingContext, aDirtyRect, aPt, aFlags);
 }
 nsresult
 nsTableCellFrame::ProcessBorders(nsTableFrame* aFrame,
                                  nsDisplayListBuilder* aBuilder,
                                  const nsDisplayListSet& aLists)
 {
   const nsStyleBorder* borderStyle = StyleBorder();
   if (aFrame->IsBorderCollapse() || !borderStyle->HasBorder())
     return NS_OK;
   if (!GetContentEmpty() ||
       StyleTableBorder()->mEmptyCells == NS_STYLE_TABLE_EMPTY_CELLS_SHOW) {
     aLists.BorderBackground()->AppendNewToTop(new (aBuilder)
                                               nsDisplayBorder(aBuilder, this));
   }
   return NS_OK;
 }
 class nsDisplayTableCellBackground : public nsDisplayTableItem {
 public:
   nsDisplayTableCellBackground(nsDisplayListBuilder* aBuilder,
                                nsTableCellFrame* aFrame) :
     nsDisplayTableItem(aBuilder, aFrame) {
     MOZ_COUNT_CTOR(nsDisplayTableCellBackground);
   }
 #ifdef NS_BUILD_REFCNT_LOGGING
   virtual ~nsDisplayTableCellBackground() {
     MOZ_COUNT_DTOR(nsDisplayTableCellBackground);
   }
 #endif
   virtual void HitTest(nsDisplayListBuilder* aBuilder, const nsRect& aRect,
                        HitTestState* aState,
                        nsTArray<nsIFrame*> *aOutFrames) MOZ_OVERRIDE {
     aOutFrames->AppendElement(mFrame);
   }
   virtual void Paint(nsDisplayListBuilder* aBuilder,
                      nsRenderingContext* aCtx) MOZ_OVERRIDE;
   virtual nsRect GetBounds(nsDisplayListBuilder* aBuilder,
                            bool* aSnap) MOZ_OVERRIDE;
   virtual void ComputeInvalidationRegion(nsDisplayListBuilder* aBuilder,
                                          const nsDisplayItemGeometry* aGeometry,
                                          nsRegion *aInvalidRegion) MOZ_OVERRIDE;
   NS_DISPLAY_DECL_NAME("TableCellBackground", TYPE_TABLE_CELL_BACKGROUND)
 };
 void nsDisplayTableCellBackground::Paint(nsDisplayListBuilder* aBuilder,
                                          nsRenderingContext* aCtx)
 {
   static_cast<nsTableCellFrame*>(mFrame)->
     PaintBackground(*aCtx, mVisibleRect, ToReferenceFrame(),
                     aBuilder->GetBackgroundPaintFlags());
 }
 nsRect
 nsDisplayTableCellBackground::GetBounds(nsDisplayListBuilder* aBuilder,
                                         bool* aSnap)
 {
   // revert from nsDisplayTableItem's implementation ... cell backgrounds
   // don't overflow the cell
   return nsDisplayItem::GetBounds(aBuilder, aSnap);
 }
 void
 nsDisplayTableCellBackground::ComputeInvalidationRegion(nsDisplayListBuilder* aBuilder,
                                                         const nsDisplayItemGeometry* aGeometry,
                                                         nsRegion *aInvalidRegion)
 {
   if (aBuilder->ShouldSyncDecodeImages()) {
     if (!nsCSSRendering::AreAllBackgroundImagesDecodedForFrame(mFrame)) {
       bool snap;
       aInvalidRegion->Or(*aInvalidRegion, GetBounds(aBuilder, &snap));
     }
   }
   nsDisplayTableItem::ComputeInvalidationRegion(aBuilder, aGeometry, aInvalidRegion);
 }
 void nsTableCellFrame::InvalidateFrame(uint32_t aDisplayItemKey)
 {
   nsIFrame::InvalidateFrame(aDisplayItemKey);
   GetParent()->InvalidateFrameWithRect(GetVisualOverflowRect() + GetPosition(), aDisplayItemKey);
 }
 void nsTableCellFrame::InvalidateFrameWithRect(const nsRect& aRect, uint32_t aDisplayItemKey)
 {
   nsIFrame::InvalidateFrameWithRect(aRect, aDisplayItemKey);
   // If we have filters applied that would affects our bounds, then
   // we get an inactive layer created and this is computed
   // within FrameLayerBuilder
   GetParent()->InvalidateFrameWithRect(aRect + GetPosition(), aDisplayItemKey);
 }
 static void
 PaintTableCellSelection(nsIFrame* aFrame, nsRenderingContext* aCtx,
                         const nsRect& aRect, nsPoint aPt)
 {
   static_cast<nsTableCellFrame*>(aFrame)->DecorateForSelection(*aCtx, aPt);
 }
 void
 nsTableCellFrame::BuildDisplayList(nsDisplayListBuilder*   aBuilder,
                                    const nsRect&           aDirtyRect,
                                    const nsDisplayListSet& aLists)
 {
   DO_GLOBAL_REFLOW_COUNT_DSP("nsTableCellFrame");
   if (IsVisibleInSelection(aBuilder)) {
     nsTableFrame* tableFrame = nsTableFrame::GetTableFrame(this);
     int32_t emptyCellStyle = GetContentEmpty() && !tableFrame->IsBorderCollapse() ?
                                 StyleTableBorder()->mEmptyCells
                                 : NS_STYLE_TABLE_EMPTY_CELLS_SHOW;
     // take account of 'empty-cells'
     if (StyleVisibility()->IsVisible() &&
         (NS_STYLE_TABLE_EMPTY_CELLS_HIDE != emptyCellStyle)) {
       bool isRoot = aBuilder->IsAtRootOfPseudoStackingContext();
       if (!isRoot) {
         nsDisplayTableItem* currentItem = aBuilder->GetCurrentTableItem();
         if (currentItem) {
           currentItem->UpdateForFrameBackground(this);
         }
       }
       // display outset box-shadows if we need to.
       const nsStyleBorder* borderStyle = StyleBorder();
       bool hasBoxShadow = !!borderStyle->mBoxShadow;
       if (hasBoxShadow) {
         aLists.BorderBackground()->AppendNewToTop(
           new (aBuilder) nsDisplayBoxShadowOuter(aBuilder, this));
       }
       // display background if we need to.
       if (aBuilder->IsForEventDelivery() ||
           (((!tableFrame->IsBorderCollapse() || isRoot) &&
           (!StyleBackground()->IsTransparent() || StyleDisplay()->mAppearance)))) {
         // The cell background was not painted by the nsTablePainter,
         // so we need to do it. We have special background processing here
         // so we need to duplicate some code from nsFrame::DisplayBorderBackgroundOutline
         nsDisplayTableItem* item =
           new (aBuilder) nsDisplayTableCellBackground(aBuilder, this);
         aLists.BorderBackground()->AppendNewToTop(item);
         item->UpdateForFrameBackground(this);
       }
       // display inset box-shadows if we need to.
       if (hasBoxShadow) {
         aLists.BorderBackground()->AppendNewToTop(
           new (aBuilder) nsDisplayBoxShadowInner(aBuilder, this));
       }
       // display borders if we need to
       ProcessBorders(tableFrame, aBuilder, aLists);
       // and display the selection border if we need to
       if (IsSelected()) {
         aLists.BorderBackground()->AppendNewToTop(new (aBuilder)
           nsDisplayGeneric(aBuilder, this, ::PaintTableCellSelection,
                            "TableCellSelection",
                            nsDisplayItem::TYPE_TABLE_CELL_SELECTION));
       }
     }
     // the 'empty-cells' property has no effect on 'outline'
     DisplayOutline(aBuilder, aLists);
   }
   // Push a null 'current table item' so that descendant tables can't
   // accidentally mess with our table
   nsAutoPushCurrentTableItem pushTableItem;
   pushTableItem.Push(aBuilder, nullptr);
   nsIFrame* kid = mFrames.FirstChild();
   NS_ASSERTION(kid && !kid->GetNextSibling(), "Table cells should have just one child");
   // The child's background will go in our BorderBackground() list.
   // This isn't a problem since it won't have a real background except for
   // event handling. We do not call BuildDisplayListForNonBlockChildren
   // because that/ would put the child's background in the Content() list
   // which isn't right (e.g., would end up on top of our child floats for
   // event handling).
   BuildDisplayListForChild(aBuilder, kid, aDirtyRect, aLists);
 }
 int
 nsTableCellFrame::GetLogicalSkipSides(const nsHTMLReflowState* aReflowState) const
 {
   int skip = 0;
   if (nullptr != GetPrevInFlow()) {
     skip |= LOGICAL_SIDE_B_START;
   }
   if (nullptr != GetNextInFlow()) {
     skip |= LOGICAL_SIDE_B_END;
   }
   return skip;
 }
 /* virtual */ nsMargin
 nsTableCellFrame::GetBorderOverflow()
 {
   return nsMargin(0, 0, 0, 0);
 }
 // Align the cell's child frame within the cell
 void nsTableCellFrame::VerticallyAlignChild(nscoord aMaxAscent)
 {
   /* It's the 'border-collapse' on the table that matters */
   nsMargin borderPadding = GetUsedBorderAndPadding();
   nscoord topInset = borderPadding.top;
   nscoord bottomInset = borderPadding.bottom;
   uint8_t verticalAlignFlags = GetVerticalAlign();
   nscoord height = mRect.height;
   nsIFrame* firstKid = mFrames.FirstChild();
   NS_ASSERTION(firstKid, "Frame construction error, a table cell always has an inner cell frame");
   nsRect kidRect = firstKid->GetRect();
   nscoord childHeight = kidRect.height;
   // Vertically align the child
   nscoord kidYTop = 0;
   switch (verticalAlignFlags)
   {
     case NS_STYLE_VERTICAL_ALIGN_BASELINE:
       // Align the baselines of the child frame with the baselines of
       // other children in the same row which have 'vertical-align: baseline'
       kidYTop = topInset + aMaxAscent - GetCellBaseline();
     break;
     case NS_STYLE_VERTICAL_ALIGN_TOP:
       // Align the top of the child frame with the top of the content area,
       kidYTop = topInset;
     break;
     case NS_STYLE_VERTICAL_ALIGN_BOTTOM:
       // Align the bottom of the child frame with the bottom of the content area,
       kidYTop = height - childHeight - bottomInset;
     break;
     default:
     case NS_STYLE_VERTICAL_ALIGN_MIDDLE:
       // Align the middle of the child frame with the middle of the content area,
       kidYTop = (height - childHeight - bottomInset + topInset) / 2;
   }
   // if the content is larger than the cell height align from top
   kidYTop = std::max(0, kidYTop);
   if (kidYTop != kidRect.y) {
     // Invalidate at the old position first
     firstKid->InvalidateFrameSubtree();
   }
   firstKid->SetPosition(nsPoint(kidRect.x, kidYTop));
   nsHTMLReflowMetrics desiredSize(GetWritingMode()); // ???
   desiredSize.Width() = mRect.width;
   desiredSize.Height() = mRect.height;
   nsRect overflow(nsPoint(0,0), GetSize());
   overflow.Inflate(GetBorderOverflow());
   desiredSize.mOverflowAreas.SetAllTo(overflow);
   ConsiderChildOverflow(desiredSize.mOverflowAreas, firstKid);
   FinishAndStoreOverflow(&desiredSize);
   if (kidYTop != kidRect.y) {
     // Make sure any child views are correctly positioned. We know the inner table
     // cell won't have a view
     nsContainerFrame::PositionChildViews(firstKid);
     // Invalidate new overflow rect
     firstKid->InvalidateFrameSubtree();
   }
   if (HasView()) {
     nsContainerFrame::SyncFrameViewAfterReflow(PresContext(), this,
                                                GetView(),
                                                desiredSize.VisualOverflow(), 0);
   }
 }
 bool
 nsTableCellFrame::UpdateOverflow()
 {
   nsRect bounds(nsPoint(0,0), GetSize());
   bounds.Inflate(GetBorderOverflow());
   nsOverflowAreas overflowAreas(bounds, bounds);
   nsLayoutUtils::UnionChildOverflow(this, overflowAreas);
   return FinishAndStoreOverflow(overflowAreas, GetSize());
 }
 // Per CSS 2.1, we map 'sub', 'super', 'text-top', 'text-bottom',
 // length, percentage, and calc() values to 'baseline'.
 uint8_t
 nsTableCellFrame::GetVerticalAlign() const
 {
   const nsStyleCoord& verticalAlign = StyleTextReset()->mVerticalAlign;
   if (verticalAlign.GetUnit() == eStyleUnit_Enumerated) {
     uint8_t value = verticalAlign.GetIntValue();
     if (value == NS_STYLE_VERTICAL_ALIGN_TOP ||
         value == NS_STYLE_VERTICAL_ALIGN_MIDDLE ||
         value == NS_STYLE_VERTICAL_ALIGN_BOTTOM) {
       return value;
     }
   }
   return NS_STYLE_VERTICAL_ALIGN_BASELINE;
 }
 bool
 nsTableCellFrame::CellHasVisibleContent(nscoord       height,
                                         nsTableFrame* tableFrame,
                                         nsIFrame*     kidFrame)
 {
   // see  http://www.w3.org/TR/CSS21/tables.html#empty-cells
   if (height > 0)
     return true;
   if (tableFrame->IsBorderCollapse())
     return true;
   nsIFrame* innerFrame = kidFrame->GetFirstPrincipalChild();
   while(innerFrame) {
     nsIAtom* frameType = innerFrame->GetType();
     if (nsGkAtoms::textFrame == frameType) {
        nsTextFrame* textFrame = static_cast<nsTextFrame*>(innerFrame);
        if (textFrame->HasNoncollapsedCharacters())
          return true;
     }
     else if (nsGkAtoms::placeholderFrame != frameType) {
       return true;
     }
     else {
       nsIFrame *floatFrame = nsLayoutUtils::GetFloatFromPlaceholder(innerFrame);
       if (floatFrame)
         return true;
     }
     innerFrame = innerFrame->GetNextSibling();
   }
   return false;
 }
 nscoord
 nsTableCellFrame::GetCellBaseline() const
 {
   // Ignore the position of the inner frame relative to the cell frame
   // since we want the position as though the inner were top-aligned.
   nsIFrame *inner = mFrames.FirstChild();
   nscoord borderPadding = GetUsedBorderAndPadding().top;
   nscoord result;
   if (nsLayoutUtils::GetFirstLineBaseline(inner, &result))
     return result + borderPadding;
   return inner->GetContentRect().YMost() - inner->GetPosition().y +
          borderPadding;
 }
 int32_t nsTableCellFrame::GetRowSpan()
 {
   int32_t rowSpan=1;
   nsGenericHTMLElement *hc = nsGenericHTMLElement::FromContent(mContent);
   // Don't look at the content's rowspan if we're a pseudo cell
   if (hc && !StyleContext()->GetPseudo()) {
     const nsAttrValue* attr = hc->GetParsedAttr(nsGkAtoms::rowspan);
     // Note that we don't need to check the tag name, because only table cells
     // and table headers parse the "rowspan" attribute into an integer.
     if (attr && attr->Type() == nsAttrValue::eInteger) {
        rowSpan = attr->GetIntegerValue();
     }
   }
   return rowSpan;
 }
 int32_t nsTableCellFrame::GetColSpan()
 {
   int32_t colSpan=1;
   nsGenericHTMLElement *hc = nsGenericHTMLElement::FromContent(mContent);
   // Don't look at the content's colspan if we're a pseudo cell
   if (hc && !StyleContext()->GetPseudo()) {
     const nsAttrValue* attr = hc->GetParsedAttr(nsGkAtoms::colspan);
     // Note that we don't need to check the tag name, because only table cells
     // and table headers parse the "colspan" attribute into an integer.
     if (attr && attr->Type() == nsAttrValue::eInteger) {
        colSpan = attr->GetIntegerValue();
     }
   }
   return colSpan;
 }
 /* virtual */ nscoord
 nsTableCellFrame::GetMinWidth(nsRenderingContext *aRenderingContext)
 {
   nscoord result = 0;
   DISPLAY_MIN_WIDTH(this, result);
   nsIFrame *inner = mFrames.FirstChild();
   result = nsLayoutUtils::IntrinsicForContainer(aRenderingContext, inner,
                                                     nsLayoutUtils::MIN_WIDTH);
   return result;
 }
 /* virtual */ nscoord
 nsTableCellFrame::GetPrefWidth(nsRenderingContext *aRenderingContext)
 {
   nscoord result = 0;
   DISPLAY_PREF_WIDTH(this, result);
   nsIFrame *inner = mFrames.FirstChild();
   result = nsLayoutUtils::IntrinsicForContainer(aRenderingContext, inner,
                                                 nsLayoutUtils::PREF_WIDTH);
   return result;
 }
 /* virtual */ nsIFrame::IntrinsicWidthOffsetData
 nsTableCellFrame::IntrinsicWidthOffsets(nsRenderingContext* aRenderingContext)
 {
   IntrinsicWidthOffsetData result =
     nsContainerFrame::IntrinsicWidthOffsets(aRenderingContext);
   result.hMargin = 0;
   result.hPctMargin = 0;
   nsMargin border;
   GetBorderWidth(border);
   result.hBorder = border.LeftRight();
   return result;
 }
 #ifdef DEBUG
 #define PROBABLY_TOO_LARGE 1000000
 static
 void DebugCheckChildSize(nsIFrame*            aChild,
                          nsHTMLReflowMetrics& aMet,
                          nsSize&              aAvailSize)
 {
   if ((aMet.Width() < 0) || (aMet.Width() > PROBABLY_TOO_LARGE)) {
     printf("WARNING: cell content %p has large width %d \n",
            static_cast<void*>(aChild), int32_t(aMet.Width()));
   }
 }
 #endif
 // the computed height for the cell, which descendants use for percent height calculations
 // it is the height (minus border, padding) of the cell's first in flow during its final
 // reflow without an unconstrained height.
 static nscoord
 CalcUnpaginagedHeight(nsPresContext*        aPresContext,
                       nsTableCellFrame&     aCellFrame,
                       nsTableFrame&         aTableFrame,
                       nscoord               aVerticalBorderPadding)
 {
   const nsTableCellFrame* firstCellInFlow =
     static_cast<nsTableCellFrame*>(aCellFrame.FirstInFlow());
   nsTableFrame* firstTableInFlow  =
     static_cast<nsTableFrame*>(aTableFrame.FirstInFlow());
   nsTableRowFrame* row =
     static_cast<nsTableRowFrame*>(firstCellInFlow->GetParent());
   nsTableRowGroupFrame* firstRGInFlow =
     static_cast<nsTableRowGroupFrame*>(row->GetParent());
   int32_t rowIndex;
   firstCellInFlow->GetRowIndex(rowIndex);
   int32_t rowSpan = aTableFrame.GetEffectiveRowSpan(*firstCellInFlow);
   nscoord cellSpacing = firstTableInFlow->GetCellSpacingX();
   nscoord computedHeight = ((rowSpan - 1) * cellSpacing) - aVerticalBorderPadding;
   int32_t rowX;
   for (row = firstRGInFlow->GetFirstRow(), rowX = 0; row; row = row->GetNextRow(), rowX++) {
     if (rowX > rowIndex + rowSpan - 1) {
       break;
     }
     else if (rowX >= rowIndex) {
       computedHeight += row->GetUnpaginatedHeight(aPresContext);
     }
   }
   return computedHeight;
 }
 nsresult nsTableCellFrame::Reflow(nsPresContext*           aPresContext,
                                    nsHTMLReflowMetrics&     aDesiredSize,
                                    const nsHTMLReflowState& aReflowState,
                                    nsReflowStatus&          aStatus)
 {
   DO_GLOBAL_REFLOW_COUNT("nsTableCellFrame");
   DISPLAY_REFLOW(aPresContext, this, aReflowState, aDesiredSize, aStatus);
   if (aReflowState.mFlags.mSpecialHeightReflow) {
     FirstInFlow()->AddStateBits(NS_TABLE_CELL_HAD_SPECIAL_REFLOW);
   }
   // see if a special height reflow needs to occur due to having a pct height
   nsTableFrame::CheckRequestSpecialHeightReflow(aReflowState);
   aStatus = NS_FRAME_COMPLETE;
   nsSize availSize(aReflowState.AvailableWidth(), aReflowState.AvailableHeight());
   nsMargin borderPadding = aReflowState.ComputedPhysicalPadding();
   nsMargin border;
   GetBorderWidth(border);
   borderPadding += border;
   nscoord topInset    = borderPadding.top;
   nscoord rightInset  = borderPadding.right;
   nscoord bottomInset = borderPadding.bottom;
   nscoord leftInset   = borderPadding.left;
   // reduce available space by insets, if we're in a constrained situation
   availSize.width -= leftInset + rightInset;
   if (NS_UNCONSTRAINEDSIZE != availSize.height)
     availSize.height -= topInset + bottomInset;
   // Try to reflow the child into the available space. It might not
   // fit or might need continuing.
   if (availSize.height < 0)
     availSize.height = 1;
   nsHTMLReflowMetrics kidSize(aReflowState.GetWritingMode(), aDesiredSize.mFlags);
   kidSize.Width() = kidSize.Height() = 0;
   SetPriorAvailWidth(aReflowState.AvailableWidth());
   nsIFrame* firstKid = mFrames.FirstChild();
   NS_ASSERTION(firstKid, "Frame construction error, a table cell always has an inner cell frame");
   nsTableFrame* tableFrame = nsTableFrame::GetTableFrame(this);
   if (aReflowState.mFlags.mSpecialHeightReflow) {
     const_cast<nsHTMLReflowState&>(aReflowState).SetComputedHeight(mRect.height - topInset - bottomInset);
     DISPLAY_REFLOW_CHANGE();
   }
   else if (aPresContext->IsPaginated()) {
     nscoord computedUnpaginatedHeight =
       CalcUnpaginagedHeight(aPresContext, (nsTableCellFrame&)*this,
                             *tableFrame, topInset + bottomInset);
     if (computedUnpaginatedHeight > 0) {
       const_cast<nsHTMLReflowState&>(aReflowState).SetComputedHeight(computedUnpaginatedHeight);
       DISPLAY_REFLOW_CHANGE();
     }
   }
   else {
     SetHasPctOverHeight(false);
   }
   nsHTMLReflowState kidReflowState(aPresContext, aReflowState, firstKid,
                                    availSize);
   // Don't be a percent height observer if we're in the middle of
   // special-height reflow, in case we get an accidental NotifyPercentHeight()
   // call (which we shouldn't honor during special-height reflow)
   if (!aReflowState.mFlags.mSpecialHeightReflow) {
     // mPercentHeightObserver is for children of cells in quirks mode,
     // but only those than are tables in standards mode.  NeedsToObserve
     // will determine how far this is propagated to descendants.
     kidReflowState.mPercentHeightObserver = this;
   }
   // Don't propagate special height reflow state to our kids
   kidReflowState.mFlags.mSpecialHeightReflow = false;
   if (aReflowState.mFlags.mSpecialHeightReflow ||
       (FirstInFlow()->GetStateBits() & NS_TABLE_CELL_HAD_SPECIAL_REFLOW)) {
     // We need to force the kid to have mVResize set if we've had a
     // special reflow in the past, since the non-special reflow needs to
     // resize back to what it was without the special height reflow.
     kidReflowState.mFlags.mVResize = true;
   }
   nsPoint kidOrigin(leftInset, topInset);
   nsRect origRect = firstKid->GetRect();
   nsRect origVisualOverflow = firstKid->GetVisualOverflowRect();
   bool firstReflow = (firstKid->GetStateBits() & NS_FRAME_FIRST_REFLOW) != 0;
   ReflowChild(firstKid, aPresContext, kidSize, kidReflowState,
               kidOrigin.x, kidOrigin.y, 0, aStatus);
   if (NS_FRAME_OVERFLOW_IS_INCOMPLETE(aStatus)) {
     // Don't pass OVERFLOW_INCOMPLETE through tables until they can actually handle it
     //XXX should paginate overflow as overflow, but not in this patch (bug 379349)
     NS_FRAME_SET_INCOMPLETE(aStatus);
     printf("Set table cell incomplete %p\n", static_cast<void*>(this));
   }
   // XXXbz is this invalidate actually needed, really?
   if (GetStateBits() & NS_FRAME_IS_DIRTY) {
     InvalidateFrameSubtree();
   }
 #ifdef DEBUG
   DebugCheckChildSize(firstKid, kidSize, availSize);
 #endif
   // 0 dimensioned cells need to be treated specially in Standard/NavQuirks mode
   // see testcase "emptyCells.html"
   nsIFrame* prevInFlow = GetPrevInFlow();
   bool isEmpty;
   if (prevInFlow) {
     isEmpty = static_cast<nsTableCellFrame*>(prevInFlow)->GetContentEmpty();
   } else {
     isEmpty = !CellHasVisibleContent(kidSize.Height(), tableFrame, firstKid);
   }
   SetContentEmpty(isEmpty);
   // Place the child
   FinishReflowChild(firstKid, aPresContext, kidSize, &kidReflowState,
                     kidOrigin.x, kidOrigin.y, 0);
   nsTableFrame::InvalidateTableFrame(firstKid, origRect, origVisualOverflow,
                                      firstReflow);
   // first, compute the height which can be set w/o being restricted by aMaxSize.height
   nscoord cellHeight = kidSize.Height();
   if (NS_UNCONSTRAINEDSIZE != cellHeight) {
     cellHeight += topInset + bottomInset;
   }
   // next determine the cell's width
   nscoord cellWidth = kidSize.Width();      // at this point, we've factored in the cell's style attributes
   // factor in border and padding
   if (NS_UNCONSTRAINEDSIZE != cellWidth) {
     cellWidth += leftInset + rightInset;
   }
   // set the cell's desired size and max element size
   aDesiredSize.Width() = cellWidth;
   aDesiredSize.Height() = cellHeight;
   // the overflow area will be computed when the child will be vertically aligned
   if (aReflowState.mFlags.mSpecialHeightReflow) {
     if (aDesiredSize.Height() > mRect.height) {
       // set a bit indicating that the pct height contents exceeded
       // the height that they could honor in the pass 2 reflow
       SetHasPctOverHeight(true);
     }
     if (NS_UNCONSTRAINEDSIZE == aReflowState.AvailableHeight()) {
       aDesiredSize.Height() = mRect.height;
     }
   }
   // If our parent is in initial reflow, it'll handle invalidating our
   // entire overflow rect.
   if (!(GetParent()->GetStateBits() & NS_FRAME_FIRST_REFLOW) &&
       nsSize(aDesiredSize.Width(), aDesiredSize.Height()) != mRect.Size()) {
     InvalidateFrame();
   }
   // remember the desired size for this reflow
   SetDesiredSize(aDesiredSize);
   NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
   return NS_OK;
 }
 /* ----- global methods ----- */
 NS_QUERYFRAME_HEAD(nsTableCellFrame)
   NS_QUERYFRAME_ENTRY(nsTableCellFrame)
   NS_QUERYFRAME_ENTRY(nsITableCellLayout)
   NS_QUERYFRAME_ENTRY(nsIPercentHeightObserver)
 NS_QUERYFRAME_TAIL_INHERITING(nsContainerFrame)
 #ifdef ACCESSIBILITY
 a11y::AccType
 nsTableCellFrame::AccessibleType()
 {
   return a11y::eHTMLTableCellType;
 }
 #endif
 /* This is primarily for editor access via nsITableLayout */
 NS_IMETHODIMP
 nsTableCellFrame::GetCellIndexes(int32_t &aRowIndex, int32_t &aColIndex)
 {
   nsresult res = GetRowIndex(aRowIndex);
   if (NS_FAILED(res))
   {
     aColIndex = 0;
     return res;
   }
   aColIndex = mColIndex;
   return  NS_OK;
 }
 nsIFrame*
 NS_NewTableCellFrame(nsIPresShell*   aPresShell,
                      nsStyleContext* aContext,
                      bool            aIsBorderCollapse)
 {
   if (aIsBorderCollapse)
     return new (aPresShell) nsBCTableCellFrame(aContext);
   else
     return new (aPresShell) nsTableCellFrame(aContext);
 }
 NS_IMPL_FRAMEARENA_HELPERS(nsBCTableCellFrame)
 nsMargin*
 nsTableCellFrame::GetBorderWidth(nsMargin&  aBorder) const
 {
   aBorder = StyleBorder()->GetComputedBorder();
   return &aBorder;
 }
 nsIAtom*
 nsTableCellFrame::GetType() const
 {
   return nsGkAtoms::tableCellFrame;
 }
 #ifdef DEBUG_FRAME_DUMP
 nsresult
 nsTableCellFrame::GetFrameName(nsAString& aResult) const
 {
   return MakeFrameName(NS_LITERAL_STRING("TableCell"), aResult);
 }
 #endif
 // nsBCTableCellFrame
 nsBCTableCellFrame::nsBCTableCellFrame(nsStyleContext* aContext)
 :nsTableCellFrame(aContext)
 {
   mTopBorder = mRightBorder = mBottomBorder = mLeftBorder = 0;
 }
 nsBCTableCellFrame::~nsBCTableCellFrame()
 {
 }
 nsIAtom*
 nsBCTableCellFrame::GetType() const
 {
   return nsGkAtoms::bcTableCellFrame;
 }
 /* virtual */ nsMargin
 nsBCTableCellFrame::GetUsedBorder() const
 {
   nsMargin result;
   GetBorderWidth(result);
   return result;
 }
 /* virtual */ bool
 nsBCTableCellFrame::GetBorderRadii(nscoord aRadii[8]) const
 {
   NS_FOR_CSS_HALF_CORNERS(corner) {
     aRadii[corner] = 0;
   }
   return false;
 }
 #ifdef DEBUG_FRAME_DUMP
 nsresult
 nsBCTableCellFrame::GetFrameName(nsAString& aResult) const
 {
   return MakeFrameName(NS_LITERAL_STRING("BCTableCell"), aResult);
 }
 #endif
 nsMargin*
 nsBCTableCellFrame::GetBorderWidth(nsMargin&  aBorder) const
 {
   int32_t aPixelsToTwips = nsPresContext::AppUnitsPerCSSPixel();
   aBorder.top    = BC_BORDER_BOTTOM_HALF_COORD(aPixelsToTwips, mTopBorder);
   aBorder.right  = BC_BORDER_LEFT_HALF_COORD(aPixelsToTwips, mRightBorder);
   aBorder.bottom = BC_BORDER_TOP_HALF_COORD(aPixelsToTwips, mBottomBorder);
   aBorder.left   = BC_BORDER_RIGHT_HALF_COORD(aPixelsToTwips, mLeftBorder);
   return &aBorder;
 }
 BCPixelSize
 nsBCTableCellFrame::GetBorderWidth(mozilla::css::Side aSide) const
 {
   switch(aSide) {
   case NS_SIDE_TOP:
     return BC_BORDER_BOTTOM_HALF(mTopBorder);
   case NS_SIDE_RIGHT:
     return BC_BORDER_LEFT_HALF(mRightBorder);
   case NS_SIDE_BOTTOM:
     return BC_BORDER_TOP_HALF(mBottomBorder);
   default:
     return BC_BORDER_RIGHT_HALF(mLeftBorder);
   }
 }
 void
 nsBCTableCellFrame::SetBorderWidth(mozilla::css::Side aSide,
                                    BCPixelSize aValue)
 {
   switch(aSide) {
   case NS_SIDE_TOP:
     mTopBorder = aValue;
     break;
   case NS_SIDE_RIGHT:
     mRightBorder = aValue;
     break;
   case NS_SIDE_BOTTOM:
     mBottomBorder = aValue;
     break;
   default:
     mLeftBorder = aValue;
   }
 }
 /* virtual */ nsMargin
 nsBCTableCellFrame::GetBorderOverflow()
 {
   nsMargin halfBorder;
   int32_t p2t = nsPresContext::AppUnitsPerCSSPixel();
   halfBorder.top = BC_BORDER_TOP_HALF_COORD(p2t, mTopBorder);
   halfBorder.right = BC_BORDER_RIGHT_HALF_COORD(p2t, mRightBorder);
   halfBorder.bottom = BC_BORDER_BOTTOM_HALF_COORD(p2t, mBottomBorder);
   halfBorder.left = BC_BORDER_LEFT_HALF_COORD(p2t, mLeftBorder);
   return halfBorder;
 }
 void
 nsBCTableCellFrame::PaintBackground(nsRenderingContext& aRenderingContext,
                                     const nsRect&        aDirtyRect,
                                     nsPoint              aPt,
                                     uint32_t             aFlags)
 {
   // make border-width reflect the half of the border-collapse
   // assigned border that's inside the cell
   nsMargin borderWidth;
   GetBorderWidth(borderWidth);
   nsStyleBorder myBorder(*StyleBorder());
   NS_FOR_CSS_SIDES(side) {
     myBorder.SetBorderWidth(side, borderWidth.Side(side));
   }
   nsRect rect(aPt, GetSize());
   // bypassing nsCSSRendering::PaintBackground is safe because this kind
   // of frame cannot be used for the root element
   nsCSSRendering::PaintBackgroundWithSC(PresContext(), aRenderingContext, this,
                                         aDirtyRect, rect,
                                         StyleContext(), myBorder,
                                         aFlags, nullptr);
 }

The Tor Browser / annotate

layout/tables/nsTableCellFrame.cpp@97036ab72558 (annotated)

layout/tables/nsTableCellFrame.cpp