зеркало из https://github.com/mozilla/gecko-dev.git
490 строки
14 KiB
C++
490 строки
14 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 "nsCoord.h"
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#include "mozilla/gfx/Types.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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#define MAX_ROWSPAN 65534 // the cellmap can not handle more.
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#define MAX_COLSPAN 1000 // limit as IE and opera do. If this ever changes,
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// change COL_SPAN_OFFSET/COL_SPAN_SHIFT accordingly.
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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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{
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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 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 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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/** is the entry spanned by a zero colspan
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* zero colspans span all cells starting from the originating cell towards
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* the end of the colgroup or a cell originating in the same row
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* or a rowspanned entry
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* @return is true if the entry is spanned by a zero colspan
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*/
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bool IsZeroColSpan() const;
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/** mark the current entry as spanned by a zero colspan
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* @param aIsZero if true mark the entry as covered by a zero colspan
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*/
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void SetZeroColSpan(bool aIsZero);
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/** get the distance from the current entry to the corresponding origin of 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 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 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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/** constructor.
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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); // implemented in nsCellMap.cpp
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/** destructor */
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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) does
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// not start on an odd bit boundary. If mSpan is 0 then mOrigCell is in effect
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// and the data does not represent a span. If mSpan is 1, then mBits is in
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// effect and the data represents a span.
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// mBits must match the size of 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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{
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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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typedef uint16_t BCPixelSize;
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// These are the max sizes that are stored. If they are exceeded, then the max is stored and
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// 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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static inline nscoord
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BC_BORDER_TOP_HALF_COORD(int32_t p2t, uint16_t px) { return (px - px / 2) * p2t; }
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static inline nscoord
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BC_BORDER_RIGHT_HALF_COORD(int32_t p2t, uint16_t px) { return ( px / 2) * p2t; }
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static inline nscoord
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BC_BORDER_BOTTOM_HALF_COORD(int32_t p2t, uint16_t px) { return ( px / 2) * p2t; }
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static inline nscoord
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BC_BORDER_LEFT_HALF_COORD(int32_t p2t, uint16_t px) { return (px - px / 2) * p2t; }
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#define BC_BORDER_TOP_HALF(px) ((px) - (px) / 2)
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#define BC_BORDER_RIGHT_HALF(px) ((px) / 2)
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#define BC_BORDER_BOTTOM_HALF(px) ((px) / 2)
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#define BC_BORDER_LEFT_HALF(px) ((px) - (px) / 2)
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// BCData stores the top and left border info and the corner connecting the two.
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class BCData
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{
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public:
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BCData();
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~BCData();
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nscoord GetLeftEdge(BCBorderOwner& aOwner,
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bool& aStart) const;
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void SetLeftEdge(BCBorderOwner aOwner,
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nscoord aSize,
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bool aStart);
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nscoord GetTopEdge(BCBorderOwner& aOwner,
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bool& aStart) const;
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void SetTopEdge(BCBorderOwner aOwner,
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nscoord aSize,
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bool aStart);
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BCPixelSize GetCorner(mozilla::Side& aCornerOwner,
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bool& aBevel) const;
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void SetCorner(BCPixelSize aSubSize,
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mozilla::Side aOwner,
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bool aBevel);
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bool IsLeftStart() const;
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void SetLeftStart(bool aValue);
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bool IsTopStart() const;
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void SetTopStart(bool aValue);
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protected:
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BCPixelSize mLeftSize; // size in pixels of left border
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BCPixelSize mTopSize; // size in pixels of top 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 top or bottom,
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// then the size is the max of the border
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// sizes of the segments to its left or right.
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unsigned mLeftOwner: 4; // owner of left border
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unsigned mTopOwner: 4; // owner of top border
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unsigned mLeftStart: 1; // set if this is the start of a vertical border segment
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unsigned mTopStart: 1; // set if this is the start of a horizontal border segment
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unsigned mCornerSide: 2; // mozilla::Side of the owner of the upper left corner relative to the corner
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unsigned mCornerBevel: 1; // is the corner beveled (only two segments, 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 collapsing model is in
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// effect. BCData for a row and col entry contains the left and top borders of cell at that row and
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// col and the corner connecting 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 map.
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class BCCellData : public CellData
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{
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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 three bits of flags. 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 - 3)) // there is a col span
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#define COL_SPAN_0 (1 << (COL_SPAN_SHIFT - 2)) // the col span is 0
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#define OVERLAP (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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{
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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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{
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mOrigCell = aCellFrame;
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}
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inline bool CellData::IsOrig() const
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{
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return ((nullptr != mOrigCell) && (SPAN != (SPAN & mBits)));
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}
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inline bool CellData::IsDead() const
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{
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return (0 == mBits);
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}
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inline bool CellData::IsSpan() const
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{
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return (SPAN == (SPAN & mBits));
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}
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inline bool CellData::IsRowSpan() const
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{
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return (SPAN == (SPAN & mBits)) &&
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(ROW_SPAN == (ROW_SPAN & mBits));
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}
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inline bool CellData::IsZeroRowSpan() const
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{
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return (SPAN == (SPAN & mBits)) &&
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(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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{
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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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}
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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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{
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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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{
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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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{
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return (SPAN == (SPAN & mBits)) &&
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(COL_SPAN == (COL_SPAN & mBits));
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}
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inline bool CellData::IsZeroColSpan() const
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{
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return (SPAN == (SPAN & mBits)) &&
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(COL_SPAN == (COL_SPAN & mBits)) &&
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(COL_SPAN_0 == (COL_SPAN_0 & mBits));
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}
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inline void CellData::SetZeroColSpan(bool aIsZeroSpan)
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{
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if (SPAN == (SPAN & mBits)) {
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if (aIsZeroSpan) {
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mBits |= COL_SPAN_0;
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}
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else {
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mBits &= ~COL_SPAN_0;
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}
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}
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}
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inline uint32_t CellData::GetColSpanOffset() const
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{
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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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{
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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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{
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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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{
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if (SPAN == (SPAN & mBits)) {
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if (aOverlap) {
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mBits |= OVERLAP;
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}
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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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{
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mLeftOwner = mTopOwner = eCellOwner;
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mLeftStart = mTopStart = 1;
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mLeftSize = mCornerSubSize = mTopSize = 0;
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mCornerSide = NS_SIDE_TOP;
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mCornerBevel = false;
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}
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inline BCData::~BCData()
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{
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}
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inline nscoord BCData::GetLeftEdge(BCBorderOwner& aOwner,
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bool& aStart) const
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{
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aOwner = (BCBorderOwner)mLeftOwner;
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aStart = (bool)mLeftStart;
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return (nscoord)mLeftSize;
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}
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inline void BCData::SetLeftEdge(BCBorderOwner aOwner,
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nscoord aSize,
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bool aStart)
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{
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mLeftOwner = aOwner;
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mLeftSize = (aSize > MAX_BORDER_WIDTH) ? MAX_BORDER_WIDTH : aSize;
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mLeftStart = aStart;
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}
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inline nscoord BCData::GetTopEdge(BCBorderOwner& aOwner,
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bool& aStart) const
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{
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aOwner = (BCBorderOwner)mTopOwner;
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aStart = (bool)mTopStart;
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return (nscoord)mTopSize;
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}
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inline void BCData::SetTopEdge(BCBorderOwner aOwner,
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nscoord aSize,
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bool aStart)
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{
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mTopOwner = aOwner;
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mTopSize = (aSize > MAX_BORDER_WIDTH) ? MAX_BORDER_WIDTH : aSize;
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mTopStart = aStart;
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}
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inline BCPixelSize BCData::GetCorner(mozilla::Side& aOwnerSide,
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bool& aBevel) const
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{
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aOwnerSide = mozilla::Side(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::Side aOwnerSide,
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bool aBevel)
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{
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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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inline bool BCData::IsLeftStart() const
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{
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return (bool)mLeftStart;
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}
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inline void BCData::SetLeftStart(bool aValue)
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{
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mLeftStart = aValue;
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}
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inline bool BCData::IsTopStart() const
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{
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return (bool)mTopStart;
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}
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inline void BCData::SetTopStart(bool aValue)
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{
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mTopStart = aValue;
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}
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#endif
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