The Tor Browser: gfx/thebes/MathTableStructures.h@97036ab72558

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.

     1 /* This Source Code Form is subject to the terms of the Mozilla Public

     2  * License, v. 2.0. If a copy of the MPL was not distributed with this

     3  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     5 // This file contains the structures described in Microsoft's document

     6 // "The MATH table and OpenType Features for Math Processing" (not yet public).

     7 //

     8 // Arrays of varying size are indicated in comments. Typically, gfxMathTable

     9 // will read the header of the structure first, verify that there is enough

    10 // space for the specified arrays and then use a pointer to browse these arrays.

    12 #ifndef MATH_TABLE_STRUCTURE_H

    13 #define MATH_TABLE_STRUCTURE_H

    15 #include "gfxFontUtils.h"

    17 typedef mozilla::AutoSwap_PRUint16 Count16;

    18 typedef mozilla::AutoSwap_PRUint16 GlyphID;

    19 typedef mozilla::AutoSwap_PRUint16 Offset;

    21 struct MathValueRecord {

    22   mozilla::AutoSwap_PRInt16  mValue;

    23   Offset                     mDeviceTable;

    24 };

    26 struct RangeRecord {

    27   GlyphID                    mStart;

    28   GlyphID                    mEnd;

    29   mozilla::AutoSwap_PRUint16 mStartCoverageIndex;

    30 };

    32 struct Coverage {

    33   mozilla::AutoSwap_PRUint16 mFormat;

    34 };

    36 struct CoverageFormat1 {

    37   mozilla::AutoSwap_PRUint16 mFormat;

    38   Count16                    mGlyphCount;

    39   // GlyphID                 mGlyphArray[mGlyphCount]

    40 };

    42 struct CoverageFormat2 {

    43   mozilla::AutoSwap_PRUint16 mFormat;

    44   Count16                    mRangeCount;

    45   // RangeRecord             mRangeArray[mRangeCount];

    46 };

    48 struct MATHTableHeader {

    49   mozilla::AutoSwap_PRUint32 mVersion;

    50   Offset                     mMathConstants;

    51   Offset                     mMathGlyphInfo;

    52   Offset                     mMathVariants;

    53 };

    55 struct MathConstants {

    56   mozilla::AutoSwap_PRInt16  mInt16[gfxFontEntry::ScriptScriptPercentScaleDown -

    57                                     gfxFontEntry::ScriptPercentScaleDown + 1];

    58   mozilla::AutoSwap_PRUint16 mUint16[gfxFontEntry::DisplayOperatorMinHeight -

    59                                      gfxFontEntry::

    60                                      DelimitedSubFormulaMinHeight + 1];

    61   MathValueRecord            mMathValues[gfxFontEntry::RadicalKernAfterDegree -

    62                                          gfxFontEntry::MathLeading + 1];

    63   mozilla::AutoSwap_PRUint16 mRadicalDegreeBottomRaisePercent;

    64 };

    66 struct MathGlyphInfo {

    67   Offset mMathItalicsCorrectionInfo;

    68   Offset mMathTopAccentAttachment;

    69   Offset mExtendedShapeCoverage;

    70   Offset mMathKernInfo;

    71 };

    73 struct MathItalicsCorrectionInfo {

    74   Offset  mCoverage;

    75   Count16 mItalicsCorrectionCount;

    76   // MathValueRecord mItalicsCorrection[mItalicsCorrectionCount]

    77 };

    79 struct MathVariants {

    80   mozilla::AutoSwap_PRUint16 mMinConnectorOverlap;

    81   Offset                     mVertGlyphCoverage;

    82   Offset                     mHorizGlyphCoverage;

    83   Count16                    mVertGlyphCount;

    84   Count16                    mHorizGlyphCount;

    85   // Offset                  mVertGlyphConstruction[mVertGlyphCount];

    86   // Offset                  mHorizGlyphConstruction[mHorizGlyphCount];

    87 };

    89 struct MathGlyphVariantRecord {

    90   GlyphID                    mVariantGlyph;

    91   mozilla::AutoSwap_PRUint16 mAdvanceMeasurement;

    92 };

    94 struct MathGlyphConstruction {

    95   Offset                    mGlyphAssembly;

    96   Count16                   mVariantCount;

    97   // MathGlyphVariantRecord mMathGlyphVariantRecord[mVariantCount]

    98 };

   100 struct GlyphPartRecord {

   101   GlyphID	              mGlyph;

   102   mozilla::AutoSwap_PRUint16 mStartConnectorLength;

   103   mozilla::AutoSwap_PRUint16 mEndConnectorLength;

   104   mozilla::AutoSwap_PRUint16 mFullAdvance;

   105   mozilla::AutoSwap_PRUint16 mPartFlags;

   106 };

   108 // PartFlags enumeration currently uses only one bit:

   109 // 0x0001 If set, the part can be skipped or repeated.

   110 // 0xFFFE Reserved.

   111 enum {

   112   PART_FLAG_EXTENDER = 0x01

   113 };

   115 struct GlyphAssembly {

   116   MathValueRecord    mItalicsCorrection;

   117   Count16            mPartCount;

   118   // GlyphPartRecord mPartRecords[mPartCount]

   119 };

   121 #endif

The Tor Browser / file revision

gfx/thebes/MathTableStructures.h@97036ab72558

gfx/thebes/MathTableStructures.h