/****************************************************************************\ Part of the XeTeX typesetting system copyright (c) 1994-2008 by SIL International copyright (c) 2009 by Jonathan Kew Written by Jonathan Kew Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 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Except as contained in this notice, the name of the copyright holders shall not be used in advertising or otherwise to promote the sale, use or other dealings in this Software without prior written authorization from the copyright holders. \****************************************************************************/ #define XETEX_OT_MATH_IMPLEMENTATION 1 #include "XeTeXOTMath.h" #include "XeTeX_ext.h" #include "XeTeXLayoutInterface.h" #include "XeTeXFontInst.h" #include "layout/CoverageTables.h" #define kMATHTableTag 0x4D415448 typedef void* voidptr; extern "C" { extern voidptr* fontlayoutengine; extern integer* fontarea; extern integer* fontsize; } #include "layout/LESwaps.h" static SInt16 getMathConstant(LEFontInstance* fontInst, mathConstantIndex whichConstant) { const char* table = (const char*)fontInst->getFontTable(kMATHTableTag); if (table == NULL) return 0; const UInt16* constants = (const UInt16*)(table + SWAPW(((const MathTableHeader*)table)->mathConstants)); if (whichConstant < firstMathValueRecord) { /* it's a simple 16-bit value */ return SWAPW(constants[whichConstant]); } else if (whichConstant <= lastMathValueRecord) { const MathValueRecord* valueRecords = (const MathValueRecord*) ((char*)constants + firstMathValueRecord * sizeof(UInt16) - firstMathValueRecord * sizeof(MathValueRecord)); return SWAPW(valueRecords[whichConstant].value); } else if (whichConstant <= lastMathConstant) { return SWAPW(constants[whichConstant + (lastMathValueRecord - firstMathValueRecord + 1)]); } else return 0; /* or abort, with "internal error" or something */ } int getotmathconstant(int f, int n) { int rval = 0; if (fontarea[f] == OTGR_FONT_FLAG) { XeTeXFontInst* font = (XeTeXFontInst*)getFont((XeTeXLayoutEngine)fontlayoutengine[f]); rval = getMathConstant(font, (mathConstantIndex)n); /* scale according to font size, except the ones that are percentages */ if (n > scriptScriptPercentScaleDown && n < radicalDegreeBottomRaisePercent) rval = X2Fix(rval * Fix2X(fontsize[f]) / font->getUnitsPerEM()); } return rval; } /* fontdimen IDs for math symbols font (family 2) */ #define math_x_height 5 #define math_quad 6 #define num1 8 /* numerator shift-up in display styles */ #define num2 9 /* numerator shift-up in non-display, non-\.{\\atop} */ #define num3 10 /* numerator shift-up in non-display \.{\\atop} */ #define denom1 11 /* denominator shift-down in display styles */ #define denom2 12 /* denominator shift-down in non-display styles */ #define sup1 13 /* superscript shift-up in uncramped display style */ #define sup2 14 /* superscript shift-up in uncramped non-display */ #define sup3 15 /* superscript shift-up in cramped styles */ #define sub1 16 /* subscript shift-down if superscript is absent */ #define sub2 17 /* subscript shift-down if superscript is present */ #define sup_drop 18 /* superscript baseline below top of large box */ #define sub_drop 19 /* subscript baseline below bottom of large box */ #define delim1 20 /* size of \.{\\atopwithdelims} delimiters */ #define delim2 21 /* size of \.{\\atopwithdelims} delimiters in non-displays */ #define axis_height 22 /* height of fraction lines above the baseline */ const mathConstantIndex TeX_sym_to_OT_map[] = { unknown, unknown, unknown, unknown, unknown, accentBaseHeight, // x-height unknown, // quad unknown, fractionNumeratorDisplayStyleShiftUp, fractionNumeratorShiftUp, stackTopShiftUp, fractionDenominatorDisplayStyleShiftDown, fractionDenominatorShiftDown, superscriptShiftUp, // ?? superscriptShiftUp, // ?? superscriptShiftUpCramped, subscriptShiftDown, // ?? subscriptShiftDown, // ?? superscriptBaselineDropMax, // ?? subscriptBaselineDropMin, // ?? delimitedSubFormulaMinHeight, unknown, // using quad instead for now axisHeight }; int getnativemathsyparam(int f, int n) { int rval = 0; if (n == math_quad || n == delim2) rval = fontsize[f]; else { if (n < sizeof(TeX_sym_to_OT_map) / sizeof(mathConstantIndex)) { mathConstantIndex ot_index = TeX_sym_to_OT_map[n]; if (ot_index != unknown) rval = getotmathconstant(f, (int)ot_index); } } // fprintf(stderr, " math_sy(%d, %d) returns %.3f\n", f, n, Fix2X(rval)); return rval; } /* fontdimen IDs for math extension font (family 3) */ #define default_rule_thickness 8 /* thickness of \.{\\over} bars */ #define big_op_spacing1 9 /* minimum clearance above a displayed op */ #define big_op_spacing2 10 /* minimum clearance below a displayed op */ #define big_op_spacing3 11 /* minimum baselineskip above displayed op */ #define big_op_spacing4 12 /* minimum baselineskip below displayed op */ #define big_op_spacing5 13 /* padding above and below displayed limits */ const mathConstantIndex TeX_ext_to_OT_map[] = { unknown, unknown, unknown, unknown, unknown, accentBaseHeight, // x-height unknown, // quad unknown, fractionRuleThickness, // default_rule_thickness upperLimitGapMin, // big_op_spacing1 lowerLimitGapMin, // big_op_spacing2 upperLimitBaselineRiseMin, // big_op_spacing3 lowerLimitBaselineDropMin, // big_op_spacing4 stackGapMin // big_op_spacing5 }; int getnativemathexparam(int f, int n) { int rval = 0; if (n == math_quad) rval = fontsize[f]; else { if (n < sizeof(TeX_ext_to_OT_map) / sizeof(mathConstantIndex)) { mathConstantIndex ot_index = TeX_ext_to_OT_map[n]; if (ot_index != unknown) rval = getotmathconstant(f, (int)ot_index); } } // fprintf(stderr, " math_ex(%d, %d) returns %.3f\n", f, n, Fix2X(rval)); return rval; } int getotmathvariant(int f, int g, int v, integer* adv, int horiz) { int rval = g; *adv = -1; if (fontarea[f] == OTGR_FONT_FLAG) { XeTeXFontInst* font = (XeTeXFontInst*)getFont((XeTeXLayoutEngine)fontlayoutengine[f]); const char* table = (const char*)font->getFontTable(kMATHTableTag); if (table == NULL) return rval; le_uint16 offset = SWAPW(((const MathTableHeader*)table)->mathVariants); if (offset == 0) return rval; const MathVariants* variants = (const MathVariants*)(table + offset); offset = horiz ? SWAPW(variants->horizGlyphCoverage) : SWAPW(variants->vertGlyphCoverage); if (offset == 0) return rval; const CoverageTable* coverage = (const CoverageTable*)(((const char*)variants) + offset); le_int32 index = coverage->getGlyphCoverage(g); if (index >= 0) { if (horiz) index += SWAPW(variants->vertGlyphCount); const MathGlyphConstruction* construction = (const MathGlyphConstruction*)(((const char*)variants) + SWAPW(variants->vertGlyphConstruction[index])); if (v < SWAPW(construction->variantCount)) { rval = SWAPW(construction->mathGlyphVariantRecord[v].variantGlyph); *adv = X2Fix(SWAPW(construction->mathGlyphVariantRecord[v].advanceMeasurement) * Fix2X(fontsize[f]) / font->getUnitsPerEM()); } } } return rval; } void* getotassemblyptr(int f, int g, int horiz) { void* rval = NULL; if (fontarea[f] == OTGR_FONT_FLAG) { XeTeXFontInst* font = (XeTeXFontInst*)getFont((XeTeXLayoutEngine)fontlayoutengine[f]); const char* table = (const char*)font->getFontTable(kMATHTableTag); if (table == NULL) return rval; le_uint16 offset = SWAPW(((const MathTableHeader*)table)->mathVariants); if (offset == 0) return rval; const MathVariants* variants = (const MathVariants*)(table + offset); offset = horiz ? SWAPW(variants->horizGlyphCoverage) : SWAPW(variants->vertGlyphCoverage); if (offset == 0) return rval; const CoverageTable* coverage = (const CoverageTable*)(((const char*)variants) + offset); le_int32 index = coverage->getGlyphCoverage(g); if (index >= 0) { if (horiz) index += SWAPW(variants->vertGlyphCount); const MathGlyphConstruction* construction = (const MathGlyphConstruction*)(((const char*)variants) + SWAPW(variants->vertGlyphConstruction[index])); offset = SWAPW(construction->glyphAssembly); if (offset != 0) rval = (void*)(((const char*)construction) + offset); } } return rval; } int getotmathitalcorr(int f, int g) { int rval = 0; if (fontarea[f] == OTGR_FONT_FLAG) { XeTeXFontInst* font = (XeTeXFontInst*)getFont((XeTeXLayoutEngine)fontlayoutengine[f]); const char* table = (const char*)font->getFontTable(kMATHTableTag); if (table == NULL) return rval; le_uint16 offset = SWAPW(((const MathTableHeader*)table)->mathGlyphInfo); if (offset == 0) return rval; const MathGlyphInfo* glyphInfo = (const MathGlyphInfo*)(table + offset); offset = SWAPW(glyphInfo->mathItalicsCorrectionInfo); if (offset == 0) return rval; const MathItalicsCorrectionInfo* italCorrInfo = (const MathItalicsCorrectionInfo*)(((const char*)glyphInfo) + offset); offset = SWAPW(italCorrInfo->coverage); if (offset == 0) return rval; const CoverageTable* coverage = (const CoverageTable*)(((const char*)italCorrInfo) + offset); le_int32 index = coverage->getGlyphCoverage(g); if (index >= 0 && index < SWAPW(italCorrInfo->italicsCorrectionCount)) rval = X2Fix(SWAPW(italCorrInfo->italicsCorrection[index].value) * Fix2X(fontsize[f]) / font->getUnitsPerEM()); } return rval; } int getotmathaccentpos(int f, int g) { int rval = 0x7fffffffUL; if (fontarea[f] == OTGR_FONT_FLAG) { XeTeXFontInst* font = (XeTeXFontInst*)getFont((XeTeXLayoutEngine)fontlayoutengine[f]); const char* table = (const char*)font->getFontTable(kMATHTableTag); if (table == NULL) return rval; le_uint16 offset = SWAPW(((const MathTableHeader*)table)->mathGlyphInfo); if (offset == 0) return rval; const MathGlyphInfo* glyphInfo = (const MathGlyphInfo*)(table + offset); offset = SWAPW(glyphInfo->mathTopAccentAttachment); if (offset == 0) return rval; const MathTopAccentAttachment* accentAttachment = (const MathTopAccentAttachment*)(((const char*)glyphInfo) + offset); offset = SWAPW(accentAttachment->coverage); if (offset == 0) return rval; const CoverageTable* coverage = (const CoverageTable*)(((const char*)accentAttachment) + offset); le_int32 index = coverage->getGlyphCoverage(g); if (index >= 0 && index < SWAPW(accentAttachment->topAccentAttachmentCount)) { rval = (le_int16)SWAPW(accentAttachment->topAccentAttachment[index].value); rval = X2Fix(rval * Fix2X(fontsize[f]) / font->getUnitsPerEM()); } } return rval; } int otminconnectoroverlap(int f) { int rval = 0; if (fontarea[f] == OTGR_FONT_FLAG) { XeTeXFontInst* font = (XeTeXFontInst*)getFont((XeTeXLayoutEngine)fontlayoutengine[f]); const char* table = (const char*)font->getFontTable(kMATHTableTag); if (table == NULL) return rval; le_uint16 offset = SWAPW(((const MathTableHeader*)table)->mathVariants); if (offset == 0) return rval; const MathVariants* variants = (const MathVariants*)(table + offset); rval = X2Fix(SWAPW(variants->minConnectorOverlap) * Fix2X(fontsize[f]) / font->getUnitsPerEM()); } return rval; } int otpartcount(const GlyphAssembly* a) { return SWAPW(a->partCount); } int otpartglyph(const GlyphAssembly* a, int i) { return SWAPW(a->partRecords[i].glyph); } int otpartisextender(const GlyphAssembly* a, int i) { return (SWAPW(a->partRecords[i].partFlags) & fExtender) != 0; } int otpartstartconnector(int f, const GlyphAssembly* a, int i) { int rval = 0; if (fontarea[f] == OTGR_FONT_FLAG) { XeTeXFontInst* font = (XeTeXFontInst*)getFont((XeTeXLayoutEngine)fontlayoutengine[f]); rval = X2Fix(SWAPW(a->partRecords[i].startConnectorLength) * Fix2X(fontsize[f]) / font->getUnitsPerEM()); } return rval; } int otpartendconnector(int f, const GlyphAssembly* a, int i) { int rval = 0; if (fontarea[f] == OTGR_FONT_FLAG) { XeTeXFontInst* font = (XeTeXFontInst*)getFont((XeTeXLayoutEngine)fontlayoutengine[f]); rval = X2Fix(SWAPW(a->partRecords[i].endConnectorLength) * Fix2X(fontsize[f]) / font->getUnitsPerEM()); } return rval; } int otpartfulladvance(int f, const GlyphAssembly* a, int i) { int rval = 0; if (fontarea[f] == OTGR_FONT_FLAG) { XeTeXFontInst* font = (XeTeXFontInst*)getFont((XeTeXLayoutEngine)fontlayoutengine[f]); rval = X2Fix(SWAPW(a->partRecords[i].fullAdvance) * Fix2X(fontsize[f]) / font->getUnitsPerEM()); } return rval; }