The Tor Browser: layout/tables/nsTableColFrame.h@97036ab72558 (annotated)

layout/tables/nsTableColFrame.h@97036ab72558 (annotated)

layout/tables/nsTableColFrame.h

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/. */
 #ifndef nsTableColFrame_h__
 #define nsTableColFrame_h__
 #include "mozilla/Attributes.h"
 #include "celldata.h"
 #include "nscore.h"
 #include "nsContainerFrame.h"
 #include "nsTArray.h"
 class nsTableCellFrame;
 enum nsTableColType {
   eColContent            = 0, // there is real col content associated
   eColAnonymousCol       = 1, // the result of a span on a col
   eColAnonymousColGroup  = 2, // the result of a span on a col group
   eColAnonymousCell      = 3  // the result of a cell alone
 };
 class nsTableColFrame : public nsSplittableFrame {
 public:
   NS_DECL_FRAMEARENA_HELPERS
   enum {eWIDTH_SOURCE_NONE          =0,   // no cell has contributed to the width style
         eWIDTH_SOURCE_CELL          =1,   // a cell specified a width
         eWIDTH_SOURCE_CELL_WITH_SPAN=2    // a cell implicitly specified a width via colspan
   };
   nsTableColType GetColType() const;
   void SetColType(nsTableColType aType);
   /** instantiate a new instance of nsTableRowFrame.
     * @param aPresShell the pres shell for this frame
     *
     * @return           the frame that was created
     */
   friend nsTableColFrame* NS_NewTableColFrame(nsIPresShell* aPresShell,
                                               nsStyleContext*  aContext);
   /** @see nsIFrame::DidSetStyleContext */
   virtual void DidSetStyleContext(nsStyleContext* aOldStyleContext) MOZ_OVERRIDE;
   int32_t GetColIndex() const;
   void SetColIndex (int32_t aColIndex);
   nsTableColFrame* GetNextCol() const;
   virtual nsresult Reflow(nsPresContext*          aPresContext,
                           nsHTMLReflowMetrics&     aDesiredSize,
                           const nsHTMLReflowState& aReflowState,
                           nsReflowStatus&          aStatus) MOZ_OVERRIDE;
   /**
    * Table columns never paint anything, nor receive events.
    */
   virtual void BuildDisplayList(nsDisplayListBuilder*   aBuilder,
                                 const nsRect&           aDirtyRect,
                                 const nsDisplayListSet& aLists) MOZ_OVERRIDE {}
   /**
    * Get the "type" of the frame
    *
    * @see nsGkAtoms::tableColFrame
    */
   virtual nsIAtom* GetType() const MOZ_OVERRIDE;
 #ifdef DEBUG_FRAME_DUMP
   virtual nsresult GetFrameName(nsAString& aResult) const MOZ_OVERRIDE;
 #endif
   virtual nsSplittableType GetSplittableType() const MOZ_OVERRIDE;
   /** return the number of the columns the col represents.  always >= 1 */
   int32_t GetSpan();
   /** convenience method, calls into cellmap */
   int32_t Count() const;
   nscoord GetLeftBorderWidth();
   void    SetLeftBorderWidth(BCPixelSize aWidth);
   nscoord GetRightBorderWidth();
   void    SetRightBorderWidth(BCPixelSize aWidth);
   /**
    * Gets inner border widths before collapsing with cell borders
    * Caller must get left border from previous column or from table
    * GetContinuousBCBorderWidth will not overwrite aBorder.left
    * see nsTablePainter about continuous borders
    *
    * @return outer right border width (left inner for next column)
    */
   nscoord GetContinuousBCBorderWidth(nsMargin& aBorder);
   /**
    * Set full border widths before collapsing with cell borders
    * @param aForSide - side to set; only valid for top, right, and bottom
    */
   void SetContinuousBCBorderWidth(uint8_t     aForSide,
                                   BCPixelSize aPixelValue);
 #ifdef DEBUG
   void Dump(int32_t aIndent);
 #endif
   /**
    * Restore the default values of the intrinsic widths, so that we can
    * re-accumulate intrinsic widths from the cells in the column.
    */
   void ResetIntrinsics() {
     mMinCoord = 0;
     mPrefCoord = 0;
     mPrefPercent = 0.0f;
     mHasSpecifiedCoord = false;
   }
   /**
    * Restore the default value of the preferred percentage width (the
    * only intrinsic width used by FixedTableLayoutStrategy.
    */
   void ResetPrefPercent() {
     mPrefPercent = 0.0f;
   }
   /**
    * Restore the default values of the temporary buffer for
    * spanning-cell intrinsic widths (as we process spanning cells).
    */
   void ResetSpanIntrinsics() {
     mSpanMinCoord = 0;
     mSpanPrefCoord = 0;
     mSpanPrefPercent = 0.0f;
   }
   /**
    * Add the widths for a cell or column element, or the contribution of
    * the widths from a column-spanning cell:
    * @param aMinCoord The minimum intrinsic width
    * @param aPrefCoord The preferred intrinsic width or, if there is a
    *   specified non-percentage width, max(specified width, minimum intrinsic
    *   width).
    * @param aHasSpecifiedCoord Whether there is a specified
    *   non-percentage width.
    *
    * Note that the implementation of this functions is a bit tricky
    * since mPrefCoord means different things depending on
    * whether mHasSpecifiedCoord is true (and likewise for aPrefCoord and
    * aHasSpecifiedCoord).  If mHasSpecifiedCoord is false, then
    * all widths added had aHasSpecifiedCoord false and mPrefCoord is the
    * largest of the pref widths.  But if mHasSpecifiedCoord is true,
    * then mPrefCoord is the largest of (1) the pref widths for cells
    * with aHasSpecifiedCoord true and (2) the min widths for cells with
    * aHasSpecifiedCoord false.
    */
   void AddCoords(nscoord aMinCoord, nscoord aPrefCoord,
                  bool aHasSpecifiedCoord) {
     NS_ASSERTION(aMinCoord <= aPrefCoord, "intrinsic widths out of order");
     if (aHasSpecifiedCoord && !mHasSpecifiedCoord) {
       mPrefCoord = mMinCoord;
       mHasSpecifiedCoord = true;
     }
     if (!aHasSpecifiedCoord && mHasSpecifiedCoord) {
       aPrefCoord = aMinCoord; // NOTE: modifying argument
     }
     if (aMinCoord > mMinCoord)
       mMinCoord = aMinCoord;
     if (aPrefCoord > mPrefCoord)
       mPrefCoord = aPrefCoord;
     NS_ASSERTION(mMinCoord <= mPrefCoord, "min larger than pref");
   }
   /**
    * Add a percentage width specified on a cell or column element or the
    * contribution to this column of a percentage width specified on a
    * column-spanning cell.
    */
   void AddPrefPercent(float aPrefPercent) {
     if (aPrefPercent > mPrefPercent)
       mPrefPercent = aPrefPercent;
   }
   /**
    * Get the largest minimum intrinsic width for this column.
    */
   nscoord GetMinCoord() const { return mMinCoord; }
   /**
    * Get the largest preferred width for this column, or, if there were
    * any specified non-percentage widths (see GetHasSpecifiedCoord), the
    * largest minimum intrinsic width or specified width.
    */
   nscoord GetPrefCoord() const { return mPrefCoord; }
   /**
    * Get whether there were any specified widths contributing to this
    * column.
    */
   bool GetHasSpecifiedCoord() const { return mHasSpecifiedCoord; }
   /**
    * Get the largest specified percentage width contributing to this
    * column (returns 0 if there were none).
    */
   float GetPrefPercent() const { return mPrefPercent; }
   /**
    * Like AddCoords, but into a temporary buffer used for groups of
    * column-spanning cells.
    */
   void AddSpanCoords(nscoord aSpanMinCoord, nscoord aSpanPrefCoord,
                      bool aSpanHasSpecifiedCoord) {
     NS_ASSERTION(aSpanMinCoord <= aSpanPrefCoord,
                  "intrinsic widths out of order");
     if (!aSpanHasSpecifiedCoord && mHasSpecifiedCoord) {
       aSpanPrefCoord = aSpanMinCoord; // NOTE: modifying argument
     }
     if (aSpanMinCoord > mSpanMinCoord)
       mSpanMinCoord = aSpanMinCoord;
     if (aSpanPrefCoord > mSpanPrefCoord)
       mSpanPrefCoord = aSpanPrefCoord;
     NS_ASSERTION(mSpanMinCoord <= mSpanPrefCoord, "min larger than pref");
   }
   /*
    * Accumulate percentage widths on column spanning cells into
    * temporary variables.
    */
   void AddSpanPrefPercent(float aSpanPrefPercent) {
     if (aSpanPrefPercent > mSpanPrefPercent)
       mSpanPrefPercent = aSpanPrefPercent;
   }
   /*
    * Accumulate the temporary variables for column spanning cells into
    * the primary variables.
    */
   void AccumulateSpanIntrinsics() {
     AddCoords(mSpanMinCoord, mSpanPrefCoord, mHasSpecifiedCoord);
     AddPrefPercent(mSpanPrefPercent);
   }
   // Used to adjust a column's pref percent so that the table's total
   // never exceeeds 100% (by only allowing percentages to be used,
   // starting at the first column, until they reach 100%).
   void AdjustPrefPercent(float *aTableTotalPercent) {
     float allowed = 1.0f - *aTableTotalPercent;
     if (mPrefPercent > allowed)
       mPrefPercent = allowed;
     *aTableTotalPercent += mPrefPercent;
   }
   // The final width of the column.
   void ResetFinalWidth() {
     mFinalWidth = nscoord_MIN; // so we detect that it changed
   }
   void SetFinalWidth(nscoord aFinalWidth) {
     mFinalWidth = aFinalWidth;
   }
   nscoord GetFinalWidth() {
     return mFinalWidth;
   }
   virtual bool IsFrameOfType(uint32_t aFlags) const MOZ_OVERRIDE
   {
     return nsSplittableFrame::IsFrameOfType(aFlags & ~(nsIFrame::eTablePart));
   }
   virtual void InvalidateFrame(uint32_t aDisplayItemKey = 0) MOZ_OVERRIDE;
   virtual void InvalidateFrameWithRect(const nsRect& aRect, uint32_t aDisplayItemKey = 0) MOZ_OVERRIDE;
   virtual void InvalidateFrameForRemoval() MOZ_OVERRIDE { InvalidateFrameSubtree(); }
 protected:
   nsTableColFrame(nsStyleContext* aContext);
   ~nsTableColFrame();
   nscoord mMinCoord;
   nscoord mPrefCoord;
   nscoord mSpanMinCoord; // XXX...
   nscoord mSpanPrefCoord; // XXX...
   float mPrefPercent;
   float mSpanPrefPercent; // XXX...
   // ...XXX the four members marked above could be allocated as part of
   // a separate array allocated only during
   // BasicTableLayoutStrategy::ComputeColumnIntrinsicWidths (and only
   // when colspans were present).
   nscoord mFinalWidth;
   // the index of the column with respect to the whole table (starting at 0)
   // it should never be smaller then the start column index of the parent
   // colgroup
   uint32_t mColIndex;
   // border width in pixels of the inner half of the border only
   BCPixelSize mLeftBorderWidth;
   BCPixelSize mRightBorderWidth;
   BCPixelSize mTopContBorderWidth;
   BCPixelSize mRightContBorderWidth;
   BCPixelSize mBottomContBorderWidth;
   bool mHasSpecifiedCoord;
 };
 inline int32_t nsTableColFrame::GetColIndex() const
 {
   return mColIndex;
 }
 inline void nsTableColFrame::SetColIndex (int32_t aColIndex)
 {
   mColIndex = aColIndex;
 }
 inline nscoord nsTableColFrame::GetLeftBorderWidth()
 {
   return mLeftBorderWidth;
 }
 inline void nsTableColFrame::SetLeftBorderWidth(BCPixelSize aWidth)
 {
   mLeftBorderWidth = aWidth;
 }
 inline nscoord nsTableColFrame::GetRightBorderWidth()
 {
   return mRightBorderWidth;
 }
 inline void nsTableColFrame::SetRightBorderWidth(BCPixelSize aWidth)
 {
   mRightBorderWidth = aWidth;
 }
 inline nscoord
 nsTableColFrame::GetContinuousBCBorderWidth(nsMargin& aBorder)
 {
   int32_t aPixelsToTwips = nsPresContext::AppUnitsPerCSSPixel();
   aBorder.top = BC_BORDER_BOTTOM_HALF_COORD(aPixelsToTwips,
                                             mTopContBorderWidth);
   aBorder.right = BC_BORDER_LEFT_HALF_COORD(aPixelsToTwips,
                                             mRightContBorderWidth);
   aBorder.bottom = BC_BORDER_TOP_HALF_COORD(aPixelsToTwips,
                                             mBottomContBorderWidth);
   return BC_BORDER_RIGHT_HALF_COORD(aPixelsToTwips, mRightContBorderWidth);
 }
 #endif

The Tor Browser / annotate

layout/tables/nsTableColFrame.h@97036ab72558 (annotated)

layout/tables/nsTableColFrame.h