tenfourfox/gfx/thebes/MathTableStructures.h
Cameron Kaiser c9b2922b70 hello FPR
2017-04-19 00:56:45 -07:00

122 lines
3.8 KiB
C

/* 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/. */
// This file contains the structures described in Microsoft's document
// "The MATH table and OpenType Features for Math Processing" (not yet public).
//
// Arrays of varying size are indicated in comments. Typically, gfxMathTable
// will read the header of the structure first, verify that there is enough
// space for the specified arrays and then use a pointer to browse these arrays.
#ifndef MATH_TABLE_STRUCTURE_H
#define MATH_TABLE_STRUCTURE_H
#include "gfxFontUtils.h"
typedef mozilla::AutoSwap_PRUint16 Count16;
typedef mozilla::AutoSwap_PRUint16 GlyphID;
typedef mozilla::AutoSwap_PRUint16 Offset;
struct MathValueRecord {
mozilla::AutoSwap_PRInt16 mValue;
Offset mDeviceTable;
};
struct RangeRecord {
GlyphID mStart;
GlyphID mEnd;
mozilla::AutoSwap_PRUint16 mStartCoverageIndex;
};
struct Coverage {
mozilla::AutoSwap_PRUint16 mFormat;
};
struct CoverageFormat1 {
mozilla::AutoSwap_PRUint16 mFormat;
Count16 mGlyphCount;
// GlyphID mGlyphArray[mGlyphCount]
};
struct CoverageFormat2 {
mozilla::AutoSwap_PRUint16 mFormat;
Count16 mRangeCount;
// RangeRecord mRangeArray[mRangeCount];
};
struct MATHTableHeader {
mozilla::AutoSwap_PRUint32 mVersion;
Offset mMathConstants;
Offset mMathGlyphInfo;
Offset mMathVariants;
};
struct MathConstants {
mozilla::AutoSwap_PRInt16 mInt16[gfxFontEntry::ScriptScriptPercentScaleDown -
gfxFontEntry::ScriptPercentScaleDown + 1];
mozilla::AutoSwap_PRUint16 mUint16[gfxFontEntry::DisplayOperatorMinHeight -
gfxFontEntry::
DelimitedSubFormulaMinHeight + 1];
MathValueRecord mMathValues[gfxFontEntry::RadicalKernAfterDegree -
gfxFontEntry::MathLeading + 1];
mozilla::AutoSwap_PRUint16 mRadicalDegreeBottomRaisePercent;
};
struct MathGlyphInfo {
Offset mMathItalicsCorrectionInfo;
Offset mMathTopAccentAttachment;
Offset mExtendedShapeCoverage;
Offset mMathKernInfo;
};
struct MathItalicsCorrectionInfo {
Offset mCoverage;
Count16 mItalicsCorrectionCount;
// MathValueRecord mItalicsCorrection[mItalicsCorrectionCount]
};
struct MathVariants {
mozilla::AutoSwap_PRUint16 mMinConnectorOverlap;
Offset mVertGlyphCoverage;
Offset mHorizGlyphCoverage;
Count16 mVertGlyphCount;
Count16 mHorizGlyphCount;
// Offset mVertGlyphConstruction[mVertGlyphCount];
// Offset mHorizGlyphConstruction[mHorizGlyphCount];
};
struct MathGlyphVariantRecord {
GlyphID mVariantGlyph;
mozilla::AutoSwap_PRUint16 mAdvanceMeasurement;
};
struct MathGlyphConstruction {
Offset mGlyphAssembly;
Count16 mVariantCount;
// MathGlyphVariantRecord mMathGlyphVariantRecord[mVariantCount]
};
struct GlyphPartRecord {
GlyphID mGlyph;
mozilla::AutoSwap_PRUint16 mStartConnectorLength;
mozilla::AutoSwap_PRUint16 mEndConnectorLength;
mozilla::AutoSwap_PRUint16 mFullAdvance;
mozilla::AutoSwap_PRUint16 mPartFlags;
};
// PartFlags enumeration currently uses only one bit:
// 0x0001 If set, the part can be skipped or repeated.
// 0xFFFE Reserved.
enum {
PART_FLAG_EXTENDER = 0x01
};
struct GlyphAssembly {
MathValueRecord mItalicsCorrection;
Count16 mPartCount;
// GlyphPartRecord mPartRecords[mPartCount]
};
#endif