1 /* 2 * 3 * (C) Copyright IBM Corp. 1998-2010 - All Rights Reserved 4 * 5 */ 6 7 #include "LETypes.h" 8 #include "LEFontInstance.h" 9 #include "OpenTypeTables.h" 10 #include "AnchorTables.h" 11 #include "MarkArrays.h" 12 #include "GlyphPositioningTables.h" 13 #include "AttachmentPosnSubtables.h" 14 #include "MarkToBasePosnSubtables.h" 15 #include "GlyphIterator.h" 16 #include "LESwaps.h" 17 18 U_NAMESPACE_BEGIN 19 20 LEGlyphID MarkToBasePositioningSubtable::findBaseGlyph(GlyphIterator *glyphIterator) const 21 { 22 if (glyphIterator->prev()) { 23 return glyphIterator->getCurrGlyphID(); 24 } 25 26 return 0xFFFF; 27 } 28 29 le_int32 MarkToBasePositioningSubtable::process(GlyphIterator *glyphIterator, const LEFontInstance *fontInstance) const 30 { 31 LEGlyphID markGlyph = glyphIterator->getCurrGlyphID(); 32 le_int32 markCoverage = getGlyphCoverage((LEGlyphID) markGlyph); 33 34 if (markCoverage < 0) { 35 // markGlyph isn't a covered mark glyph 36 return 0; 37 } 38 39 LEPoint markAnchor; 40 const MarkArray *markArray = (const MarkArray *) ((char *) this + SWAPW(markArrayOffset)); 41 le_int32 markClass = markArray->getMarkClass(markGlyph, markCoverage, fontInstance, markAnchor); 42 le_uint16 mcCount = SWAPW(classCount); 43 44 if (markClass < 0 || markClass >= mcCount) { 45 // markGlyph isn't in the mark array or its 46 // mark class is too big. The table is mal-formed! 47 return 0; 48 } 49 50 // FIXME: We probably don't want to find a base glyph before a previous ligature... 51 GlyphIterator baseIterator(*glyphIterator, (le_uint16) (lfIgnoreMarks /*| lfIgnoreLigatures*/)); 52 LEGlyphID baseGlyph = findBaseGlyph(&baseIterator); 53 le_int32 baseCoverage = getBaseCoverage((LEGlyphID) baseGlyph); 54 const BaseArray *baseArray = (const BaseArray *) ((char *) this + SWAPW(baseArrayOffset)); 55 le_uint16 baseCount = SWAPW(baseArray->baseRecordCount); 56 57 if (baseCoverage < 0 || baseCoverage >= baseCount) { 58 // The base glyph isn't covered, or the coverage 59 // index is too big. The latter means that the 60 // table is mal-formed... 61 return 0; 62 } 63 64 const BaseRecord *baseRecord = &baseArray->baseRecordArray[baseCoverage * mcCount]; 65 Offset anchorTableOffset = SWAPW(baseRecord->baseAnchorTableOffsetArray[markClass]); 66 const AnchorTable *anchorTable = (const AnchorTable *) ((char *) baseArray + anchorTableOffset); 67 LEPoint baseAnchor, markAdvance, pixels; 68 69 if (anchorTableOffset == 0) { 70 // this means the table is mal-formed... 71 glyphIterator->setCurrGlyphBaseOffset(baseIterator.getCurrStreamPosition()); 72 return 0; 73 } 74 75 anchorTable->getAnchor(baseGlyph, fontInstance, baseAnchor); 76 77 fontInstance->getGlyphAdvance(markGlyph, pixels); 78 fontInstance->pixelsToUnits(pixels, markAdvance); 79 80 float anchorDiffX = baseAnchor.fX - markAnchor.fX; 81 float anchorDiffY = baseAnchor.fY - markAnchor.fY; 82 83 glyphIterator->setCurrGlyphBaseOffset(baseIterator.getCurrStreamPosition()); 84 85 if (glyphIterator->isRightToLeft()) { 86 // FIXME: need similar patch to below; also in MarkToLigature and MarkToMark 87 // (is there a better way to approach this for all the cases?) 88 glyphIterator->setCurrGlyphPositionAdjustment(anchorDiffX, anchorDiffY, -markAdvance.fX, -markAdvance.fY); 89 } else { 90 LEPoint baseAdvance; 91 92 fontInstance->getGlyphAdvance(baseGlyph, pixels); 93 94 //JK: adjustment needs to account for non-zero advance of any marks between base glyph and current mark 95 GlyphIterator gi(baseIterator, (le_uint16)0); // copy of baseIterator that won't ignore marks 96 gi.next(); // point beyond the base glyph 97 while (gi.getCurrStreamPosition() < glyphIterator->getCurrStreamPosition()) { // for all intervening glyphs (marks)... 98 LEGlyphID otherMark = gi.getCurrGlyphID(); 99 LEPoint px; 100 fontInstance->getGlyphAdvance(otherMark, px); // get advance, in case it's non-zero 101 pixels.fX += px.fX; // and add that to the base glyph's advance 102 pixels.fY += px.fY; 103 gi.next(); 104 } 105 // end of JK patch 106 107 fontInstance->pixelsToUnits(pixels, baseAdvance); 108 109 glyphIterator->setCurrGlyphPositionAdjustment(anchorDiffX - baseAdvance.fX, anchorDiffY - baseAdvance.fY, -markAdvance.fX, -markAdvance.fY); 110 } 111 112 return 1; 113 } 114 115 U_NAMESPACE_END 116
