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