michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: // This file contains the structures described in Microsoft's document
michael@0: // "The MATH table and OpenType Features for Math Processing" (not yet public).
michael@0: //
michael@0: // Arrays of varying size are indicated in comments. Typically, gfxMathTable
michael@0: // will read the header of the structure first, verify that there is enough
michael@0: // space for the specified arrays and then use a pointer to browse these arrays.
michael@0: 
michael@0: #ifndef MATH_TABLE_STRUCTURE_H
michael@0: #define MATH_TABLE_STRUCTURE_H
michael@0: 
michael@0: #include "gfxFontUtils.h"
michael@0: 
michael@0: typedef mozilla::AutoSwap_PRUint16 Count16;
michael@0: typedef mozilla::AutoSwap_PRUint16 GlyphID;
michael@0: typedef mozilla::AutoSwap_PRUint16 Offset;
michael@0: 
michael@0: struct MathValueRecord {
michael@0:   mozilla::AutoSwap_PRInt16  mValue;
michael@0:   Offset                     mDeviceTable;
michael@0: };
michael@0: 
michael@0: struct RangeRecord {
michael@0:   GlyphID                    mStart;
michael@0:   GlyphID                    mEnd;
michael@0:   mozilla::AutoSwap_PRUint16 mStartCoverageIndex;
michael@0: };
michael@0: 
michael@0: struct Coverage {
michael@0:   mozilla::AutoSwap_PRUint16 mFormat;
michael@0: };
michael@0: 
michael@0: struct CoverageFormat1 {
michael@0:   mozilla::AutoSwap_PRUint16 mFormat;
michael@0:   Count16                    mGlyphCount;
michael@0:   // GlyphID                 mGlyphArray[mGlyphCount]
michael@0: };
michael@0: 
michael@0: struct CoverageFormat2 {
michael@0:   mozilla::AutoSwap_PRUint16 mFormat;
michael@0:   Count16                    mRangeCount;
michael@0:   // RangeRecord             mRangeArray[mRangeCount];
michael@0: };
michael@0: 
michael@0: struct MATHTableHeader {
michael@0:   mozilla::AutoSwap_PRUint32 mVersion;
michael@0:   Offset                     mMathConstants;
michael@0:   Offset                     mMathGlyphInfo;
michael@0:   Offset                     mMathVariants;
michael@0: };
michael@0: 
michael@0: struct MathConstants {
michael@0:   mozilla::AutoSwap_PRInt16  mInt16[gfxFontEntry::ScriptScriptPercentScaleDown -
michael@0:                                     gfxFontEntry::ScriptPercentScaleDown + 1];
michael@0:   mozilla::AutoSwap_PRUint16 mUint16[gfxFontEntry::DisplayOperatorMinHeight -
michael@0:                                      gfxFontEntry::
michael@0:                                      DelimitedSubFormulaMinHeight + 1];
michael@0:   MathValueRecord            mMathValues[gfxFontEntry::RadicalKernAfterDegree -
michael@0:                                          gfxFontEntry::MathLeading + 1];
michael@0:   mozilla::AutoSwap_PRUint16 mRadicalDegreeBottomRaisePercent;
michael@0: };
michael@0: 
michael@0: struct MathGlyphInfo {
michael@0:   Offset mMathItalicsCorrectionInfo;
michael@0:   Offset mMathTopAccentAttachment;
michael@0:   Offset mExtendedShapeCoverage;
michael@0:   Offset mMathKernInfo;
michael@0: };
michael@0: 
michael@0: struct MathItalicsCorrectionInfo {
michael@0:   Offset  mCoverage;
michael@0:   Count16 mItalicsCorrectionCount;
michael@0:   // MathValueRecord mItalicsCorrection[mItalicsCorrectionCount]
michael@0: };
michael@0: 
michael@0: struct MathVariants {
michael@0:   mozilla::AutoSwap_PRUint16 mMinConnectorOverlap;
michael@0:   Offset                     mVertGlyphCoverage;
michael@0:   Offset                     mHorizGlyphCoverage;
michael@0:   Count16                    mVertGlyphCount;
michael@0:   Count16                    mHorizGlyphCount;
michael@0:   // Offset                  mVertGlyphConstruction[mVertGlyphCount];
michael@0:   // Offset                  mHorizGlyphConstruction[mHorizGlyphCount];
michael@0: };
michael@0: 
michael@0: struct MathGlyphVariantRecord {
michael@0:   GlyphID                    mVariantGlyph;
michael@0:   mozilla::AutoSwap_PRUint16 mAdvanceMeasurement;
michael@0: };
michael@0: 
michael@0: struct MathGlyphConstruction {
michael@0:   Offset                    mGlyphAssembly;
michael@0:   Count16                   mVariantCount;
michael@0:   // MathGlyphVariantRecord mMathGlyphVariantRecord[mVariantCount]
michael@0: };
michael@0: 
michael@0: struct GlyphPartRecord {
michael@0:   GlyphID	              mGlyph;
michael@0:   mozilla::AutoSwap_PRUint16 mStartConnectorLength;
michael@0:   mozilla::AutoSwap_PRUint16 mEndConnectorLength;
michael@0:   mozilla::AutoSwap_PRUint16 mFullAdvance;
michael@0:   mozilla::AutoSwap_PRUint16 mPartFlags;
michael@0: };
michael@0: 
michael@0: // PartFlags enumeration currently uses only one bit:
michael@0: // 0x0001 If set, the part can be skipped or repeated.
michael@0: // 0xFFFE Reserved.
michael@0: enum {
michael@0:   PART_FLAG_EXTENDER = 0x01
michael@0: };
michael@0: 
michael@0: struct GlyphAssembly {
michael@0:   MathValueRecord    mItalicsCorrection;
michael@0:   Count16            mPartCount;
michael@0:   // GlyphPartRecord mPartRecords[mPartCount]
michael@0: };
michael@0: 
michael@0: #endif