1 /* 2 * 3 * (C) Copyright IBM Corp. 1998-2005 - 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 "MarkToMarkPosnSubtables.h" 15 #include "GlyphIterator.h" 16 #include "LESwaps.h" 17 18 U_NAMESPACE_BEGIN 19 20 LEGlyphID MarkToMarkPositioningSubtable::findMark2Glyph(GlyphIterator *glyphIterator) const 21 { 22 if (glyphIterator->findMark2Glyph()) { 23 return glyphIterator->getCurrGlyphID(); 24 } 25 26 return 0xFFFF; 27 } 28 29 le_int32 MarkToMarkPositioningSubtable::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 GlyphIterator mark2Iterator(*glyphIterator); 51 LEGlyphID mark2Glyph = findMark2Glyph(&mark2Iterator); 52 le_int32 mark2Coverage = getBaseCoverage((LEGlyphID) mark2Glyph); 53 const Mark2Array *mark2Array = (const Mark2Array *) ((char *) this + SWAPW(baseArrayOffset)); 54 le_uint16 mark2Count = SWAPW(mark2Array->mark2RecordCount); 55 56 if (mark2Coverage < 0 || mark2Coverage >= mark2Count) { 57 // The mark2 glyph isn't covered, or the coverage 58 // index is too big. The latter means that the 59 // table is mal-formed... 60 return 0; 61 } 62 63 const Mark2Record *mark2Record = &mark2Array->mark2RecordArray[mark2Coverage * mcCount]; 64 Offset anchorTableOffset = SWAPW(mark2Record->mark2AnchorTableOffsetArray[markClass]); 65 const AnchorTable *anchorTable = (const AnchorTable *) ((char *) mark2Array + anchorTableOffset); 66 LEPoint mark2Anchor, markAdvance, pixels; 67 68 if (anchorTableOffset == 0) { 69 // this seems to mean that the marks don't attach... 70 return 0; 71 } 72 73 anchorTable->getAnchor(mark2Glyph, fontInstance, mark2Anchor); 74 75 fontInstance->getGlyphAdvance(markGlyph, pixels); 76 fontInstance->pixelsToUnits(pixels, markAdvance); 77 78 float anchorDiffX = mark2Anchor.fX - markAnchor.fX; 79 float anchorDiffY = mark2Anchor.fY - markAnchor.fY; 80 81 glyphIterator->setCurrGlyphBaseOffset(mark2Iterator.getCurrStreamPosition()); 82 83 if (glyphIterator->isRightToLeft()) { 84 glyphIterator->setCurrGlyphPositionAdjustment(anchorDiffX, anchorDiffY, -markAdvance.fX, -markAdvance.fY); 85 } else { 86 LEPoint mark2Advance; 87 88 fontInstance->getGlyphAdvance(mark2Glyph, pixels); 89 fontInstance->pixelsToUnits(pixels, mark2Advance); 90 91 glyphIterator->setCurrGlyphPositionAdjustment(anchorDiffX - mark2Advance.fX, anchorDiffY - mark2Advance.fY, -markAdvance.fX, -markAdvance.fY); 92 } 93 94 return 1; 95 } 96 97 U_NAMESPACE_END 98
