forked from mirrors/gecko-dev
8aa47bcfb7
Differential Revision: https://phabricator.services.mozilla.com/D66016 --HG-- extra : moz-landing-system : lando
400 lines
13 KiB
C++
400 lines
13 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef CellData_h__
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#define CellData_h__
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#include "nsISupports.h"
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#include "nsITableCellLayout.h" // for MAX_COLSPAN / MAX_ROWSPAN
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#include "nsCoord.h"
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#include "mozilla/gfx/Types.h"
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#include "mozilla/WritingModes.h"
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#include <stdint.h>
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class nsTableCellFrame;
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class nsCellMap;
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class BCCellData;
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/**
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* Data stored by nsCellMap to rationalize rowspan and colspan cells.
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*/
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class CellData {
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public:
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/** Initialize the mOrigCell pointer
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* @param aOrigCell the table cell frame which will be stored in mOrigCell.
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*/
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void Init(nsTableCellFrame* aCellFrame);
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/** does a cell originate from here
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* @return is true if a cell corresponds to this cellmap entry
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*/
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bool IsOrig() const;
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/** is the celldata valid
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* @return is true if no cell originates and the cell is not spanned by
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* a row- or colspan. mBits are 0 in this case and mOrigCell is
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* nullptr
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*/
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bool IsDead() const;
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/** is the entry spanned by row- or a colspan
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* @return is true if the entry is spanned by a row- or colspan
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*/
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bool IsSpan() const;
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/** is the entry spanned by rowspan
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* @return is true if the entry is spanned by a rowspan
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*/
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bool IsRowSpan() const;
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/** is the entry spanned by a zero rowspan
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* zero rowspans span all cells starting from the originating cell down to
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* the end of the rowgroup or a cell originating in the same column
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* @return is true if the entry is spanned by a zero rowspan
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*/
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bool IsZeroRowSpan() const;
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/** mark the current entry as spanned by a zero rowspan
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* @param aIsZero if true mark the entry as covered by a zero rowspan
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*/
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void SetZeroRowSpan(bool aIsZero);
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/** get the distance from the current entry to the corresponding origin of the
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* rowspan
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* @return containing the distance in the column to the originating cell
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*/
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uint32_t GetRowSpanOffset() const;
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/** set the distance from the current entry to the corresponding origin of
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* the rowspan
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* @param the distance in the column to the originating cell
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*/
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void SetRowSpanOffset(uint32_t aSpan);
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/** is the entry spanned by colspan
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* @return is true if the entry is spanned by a colspan
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*/
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bool IsColSpan() const;
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/** get the distance from the current entry to the corresponding origin of
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* the colspan
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* @return containing the distance in the row to the originating cell
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*/
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uint32_t GetColSpanOffset() const;
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/** set the distance from the current entry to the corresponding origin of the
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* colspan
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* @param the distance in the column to the originating cell
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*/
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void SetColSpanOffset(uint32_t aSpan);
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/** is the entry spanned by a row- and a colspan
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* @return is true if the entry is spanned by a row- and a colspan
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*/
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bool IsOverlap() const;
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/** mark the current entry as spanned by a row- and a colspan
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* @param aOverlap if true mark the entry as covered by a row- and
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* a colspan
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*/
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void SetOverlap(bool aOverlap);
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/** get the table cell frame for this entry
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* @return a pointer to the cellframe, this will be nullptr when the entry
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* is only a spanned entry
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*/
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nsTableCellFrame* GetCellFrame() const;
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private:
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friend class nsCellMap;
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friend class BCCellData;
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/**
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* Implemented in nsCellMap.cpp
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*
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* @param aOrigCell the table cell frame which will be stored in mOrigCell.
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*/
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explicit CellData(nsTableCellFrame* aOrigCell);
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~CellData(); // implemented in nsCellMap.cpp
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protected:
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// this union relies on the assumption that an object (not primitive type)
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// does not start on an odd bit boundary. If mSpan is 0 then mOrigCell is in
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// effect and the data does not represent a span. If mSpan is 1, then mBits is
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// in effect and the data represents a span. mBits must match the size of
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// mOrigCell on both 32- and 64-bit platforms.
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union {
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nsTableCellFrame* mOrigCell;
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uintptr_t mBits;
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};
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};
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// Border Collapsing Cell Data
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enum BCBorderOwner {
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eTableOwner = 0,
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eColGroupOwner = 1,
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eAjaColGroupOwner = 2, // col group to the left
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eColOwner = 3,
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eAjaColOwner = 4, // col to the left
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eRowGroupOwner = 5,
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eAjaRowGroupOwner = 6, // row group above
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eRowOwner = 7,
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eAjaRowOwner = 8, // row above
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eCellOwner = 9,
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eAjaCellOwner = 10 // cell to the top or to the left
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};
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// BCPixelSize is in device pixels.
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typedef uint16_t BCPixelSize;
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// These are the max sizes that are stored. If they are exceeded, then the max
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// is stored and the actual value is computed when needed.
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#define MAX_BORDER_WIDTH nscoord((1u << (sizeof(BCPixelSize) * 8)) - 1)
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// The half of border on inline/block-axis start side
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static inline BCPixelSize BC_BORDER_START_HALF(BCPixelSize px) {
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return px - px / 2;
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}
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// The half of border on inline/block-axis end side
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static inline BCPixelSize BC_BORDER_END_HALF(BCPixelSize px) { return px / 2; }
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static inline nscoord BC_BORDER_START_HALF_COORD(int32_t d2a, BCPixelSize px) {
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return BC_BORDER_START_HALF(px) * d2a;
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}
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static inline nscoord BC_BORDER_END_HALF_COORD(int32_t d2a, BCPixelSize px) {
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return BC_BORDER_END_HALF(px) * d2a;
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}
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// BCData stores the bstart and istart border info and the corner connecting the
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// two.
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class BCData {
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public:
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BCData();
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~BCData();
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nscoord GetIStartEdge(BCBorderOwner& aOwner, bool& aStart) const;
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void SetIStartEdge(BCBorderOwner aOwner, nscoord aSize, bool aStart);
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nscoord GetBStartEdge(BCBorderOwner& aOwner, bool& aStart) const;
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void SetBStartEdge(BCBorderOwner aOwner, nscoord aSize, bool aStart);
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BCPixelSize GetCorner(mozilla::LogicalSide& aCornerOwner, bool& aBevel) const;
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void SetCorner(BCPixelSize aSubSize, mozilla::LogicalSide aOwner,
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bool aBevel);
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inline bool IsIStartStart() const { return (bool)mIStartStart; }
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inline void SetIStartStart(bool aValue) { mIStartStart = aValue; }
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inline bool IsBStartStart() const { return (bool)mBStartStart; }
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inline void SetBStartStart(bool aValue) { mBStartStart = aValue; }
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protected:
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BCPixelSize mIStartSize; // size in pixels of iStart border
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BCPixelSize mBStartSize; // size in pixels of bStart border
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BCPixelSize mCornerSubSize; // size of the largest border not in the
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// dominant plane (for example, if corner is
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// owned by the segment to its bStart or bEnd,
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// then the size is the max of the border
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// sizes of the segments to its iStart or iEnd.
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unsigned mIStartOwner : 4; // owner of iStart border
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unsigned mBStartOwner : 4; // owner of bStart border
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unsigned mIStartStart : 1; // set if this is the start of a block-dir border
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// segment
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unsigned mBStartStart : 1; // set if this is the start of an inline-dir
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// border segment
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unsigned mCornerSide : 2; // LogicalSide of the owner of the bStart-iStart
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// corner relative to the corner
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unsigned mCornerBevel : 1; // is the corner beveled (only two segments,
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// perpendicular, not dashed or dotted).
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};
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// BCCellData entries replace CellData entries in the cell map if the border
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// collapsing model is in effect. BCData for a row and col entry contains the
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// left and top borders of cell at that row and col and the corner connecting
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// the two. The right borders of the cells in the last col and the bottom
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// borders of the last row are stored in separate BCData entries in the cell
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// map.
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class BCCellData : public CellData {
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public:
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explicit BCCellData(nsTableCellFrame* aOrigCell);
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~BCCellData();
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BCData mData;
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};
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// The layout of a celldata is as follows. The top 10 bits are the colspan
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// offset (which is enough to represent our allowed values 1-1000 for colspan).
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// Then there are two bits of flags.
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// XXXmats Then one unused bit that we should decide how to use in bug 862624.
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// Then 16 bits of rowspan offset (which
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// lets us represent numbers up to 65535. Then another 3 bits of flags.
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// num bits to shift right to get right aligned col span
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#define COL_SPAN_SHIFT 22
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// num bits to shift right to get right aligned row span
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#define ROW_SPAN_SHIFT 3
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// the col offset to the data containing the original cell.
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#define COL_SPAN_OFFSET (0x3FF << COL_SPAN_SHIFT)
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// the row offset to the data containing the original cell
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#define ROW_SPAN_OFFSET (0xFFFF << ROW_SPAN_SHIFT)
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// And the flags
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#define SPAN 0x00000001 // there a row or col span
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#define ROW_SPAN 0x00000002 // there is a row span
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#define ROW_SPAN_0 0x00000004 // the row span is 0
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#define COL_SPAN (1 << (COL_SPAN_SHIFT - 2)) // there is a col span
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#define OVERLAP \
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(1 << (COL_SPAN_SHIFT - 1)) // there is a row span and
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// col span but not by
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// same cell
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inline nsTableCellFrame* CellData::GetCellFrame() const {
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if (SPAN != (SPAN & mBits)) {
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return mOrigCell;
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}
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return nullptr;
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}
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inline void CellData::Init(nsTableCellFrame* aCellFrame) {
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mOrigCell = aCellFrame;
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}
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inline bool CellData::IsOrig() const {
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return ((nullptr != mOrigCell) && (SPAN != (SPAN & mBits)));
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}
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inline bool CellData::IsDead() const { return (0 == mBits); }
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inline bool CellData::IsSpan() const { return (SPAN == (SPAN & mBits)); }
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inline bool CellData::IsRowSpan() const {
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return (SPAN == (SPAN & mBits)) && (ROW_SPAN == (ROW_SPAN & mBits));
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}
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inline bool CellData::IsZeroRowSpan() const {
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return (SPAN == (SPAN & mBits)) && (ROW_SPAN == (ROW_SPAN & mBits)) &&
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(ROW_SPAN_0 == (ROW_SPAN_0 & mBits));
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}
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inline void CellData::SetZeroRowSpan(bool aIsZeroSpan) {
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if (SPAN == (SPAN & mBits)) {
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if (aIsZeroSpan) {
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mBits |= ROW_SPAN_0;
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} else {
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mBits &= ~ROW_SPAN_0;
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}
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}
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}
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inline uint32_t CellData::GetRowSpanOffset() const {
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if ((SPAN == (SPAN & mBits)) && ((ROW_SPAN == (ROW_SPAN & mBits)))) {
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return (uint32_t)((mBits & ROW_SPAN_OFFSET) >> ROW_SPAN_SHIFT);
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}
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return 0;
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}
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inline void CellData::SetRowSpanOffset(uint32_t aSpan) {
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mBits &= ~ROW_SPAN_OFFSET;
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mBits |= (aSpan << ROW_SPAN_SHIFT);
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mBits |= SPAN;
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mBits |= ROW_SPAN;
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}
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inline bool CellData::IsColSpan() const {
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return (SPAN == (SPAN & mBits)) && (COL_SPAN == (COL_SPAN & mBits));
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}
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inline uint32_t CellData::GetColSpanOffset() const {
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if ((SPAN == (SPAN & mBits)) && ((COL_SPAN == (COL_SPAN & mBits)))) {
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return (uint32_t)((mBits & COL_SPAN_OFFSET) >> COL_SPAN_SHIFT);
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}
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return 0;
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}
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inline void CellData::SetColSpanOffset(uint32_t aSpan) {
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mBits &= ~COL_SPAN_OFFSET;
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mBits |= (aSpan << COL_SPAN_SHIFT);
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mBits |= SPAN;
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mBits |= COL_SPAN;
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}
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inline bool CellData::IsOverlap() const {
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return (SPAN == (SPAN & mBits)) && (OVERLAP == (OVERLAP & mBits));
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}
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inline void CellData::SetOverlap(bool aOverlap) {
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if (SPAN == (SPAN & mBits)) {
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if (aOverlap) {
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mBits |= OVERLAP;
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} else {
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mBits &= ~OVERLAP;
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}
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}
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}
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inline BCData::BCData() {
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mIStartOwner = mBStartOwner = eCellOwner;
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SetBStartStart(true);
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SetIStartStart(true);
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mIStartSize = mCornerSubSize = mBStartSize = 0;
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mCornerSide = mozilla::eLogicalSideBStart;
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mCornerBevel = false;
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}
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inline BCData::~BCData() = default;
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inline nscoord BCData::GetIStartEdge(BCBorderOwner& aOwner,
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bool& aStart) const {
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aOwner = (BCBorderOwner)mIStartOwner;
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aStart = IsIStartStart();
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return (nscoord)mIStartSize;
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}
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inline void BCData::SetIStartEdge(BCBorderOwner aOwner, nscoord aSize,
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bool aStart) {
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mIStartOwner = aOwner;
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mIStartSize = (aSize > MAX_BORDER_WIDTH) ? MAX_BORDER_WIDTH : aSize;
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SetIStartStart(aStart);
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}
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inline nscoord BCData::GetBStartEdge(BCBorderOwner& aOwner,
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bool& aStart) const {
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aOwner = (BCBorderOwner)mBStartOwner;
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aStart = IsBStartStart();
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return (nscoord)mBStartSize;
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}
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inline void BCData::SetBStartEdge(BCBorderOwner aOwner, nscoord aSize,
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bool aStart) {
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mBStartOwner = aOwner;
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mBStartSize = (aSize > MAX_BORDER_WIDTH) ? MAX_BORDER_WIDTH : aSize;
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SetBStartStart(aStart);
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}
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inline BCPixelSize BCData::GetCorner(mozilla::LogicalSide& aOwnerSide,
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bool& aBevel) const {
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aOwnerSide = mozilla::LogicalSide(mCornerSide);
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aBevel = (bool)mCornerBevel;
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return mCornerSubSize;
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}
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inline void BCData::SetCorner(BCPixelSize aSubSize,
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mozilla::LogicalSide aOwnerSide, bool aBevel) {
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mCornerSubSize = aSubSize;
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mCornerSide = aOwnerSide;
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mCornerBevel = aBevel;
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}
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#endif
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