1 /* 2 * 3 * (C) Copyright IBM Corp. 1998-2006 - All Rights Reserved 4 * 5 */ 6 7 #include "LETypes.h" 8 #include "OpenTypeTables.h" 9 #include "OpenTypeUtilities.h" 10 #include "CoverageTables.h" 11 #include "LESwaps.h" 12 13 U_NAMESPACE_BEGIN 14 15 le_int32 CoverageTable::getGlyphCoverage(LEGlyphID glyphID) const 16 { 17 switch(SWAPW(coverageFormat)) 18 { 19 case 0: 20 return -1; 21 22 case 1: 23 { 24 const CoverageFormat1Table *f1Table = (const CoverageFormat1Table *) this; 25 26 return f1Table->getGlyphCoverage(glyphID); 27 } 28 29 case 2: 30 { 31 const CoverageFormat2Table *f2Table = (const CoverageFormat2Table *) this; 32 33 return f2Table->getGlyphCoverage(glyphID); 34 } 35 36 default: 37 return -1; 38 } 39 } 40 41 le_int32 CoverageFormat1Table::getGlyphCoverage(LEGlyphID glyphID) const 42 { 43 TTGlyphID ttGlyphID = (TTGlyphID) LE_GET_GLYPH(glyphID); 44 le_uint16 count = SWAPW(glyphCount); 45 le_uint8 bit = OpenTypeUtilities::highBit(count); 46 le_uint16 power = 1 << bit; 47 le_uint16 extra = count - power; 48 le_uint16 probe = power; 49 le_uint16 index = 0; 50 51 if (count == 0) { 52 return -1; 53 } 54 55 if (SWAPW(glyphArray[extra]) <= ttGlyphID) { 56 index = extra; 57 } 58 59 while (probe > (1 << 0)) { 60 probe >>= 1; 61 62 if (SWAPW(glyphArray[index + probe]) <= ttGlyphID) { 63 index += probe; 64 } 65 } 66 67 if (SWAPW(glyphArray[index]) == ttGlyphID) { 68 return index; 69 } 70 71 return -1; 72 } 73 74 le_int32 CoverageFormat2Table::getGlyphCoverage(LEGlyphID glyphID) const 75 { 76 TTGlyphID ttGlyphID = (TTGlyphID) LE_GET_GLYPH(glyphID); 77 le_uint16 count = SWAPW(rangeCount); 78 le_int32 rangeIndex = 79 OpenTypeUtilities::getGlyphRangeIndex(ttGlyphID, rangeRecordArray, count); 80 81 if (rangeIndex < 0) { 82 return -1; 83 } 84 85 TTGlyphID firstInRange = SWAPW(rangeRecordArray[rangeIndex].firstGlyph); 86 le_uint16 startCoverageIndex = SWAPW(rangeRecordArray[rangeIndex].rangeValue); 87 88 return startCoverageIndex + (ttGlyphID - firstInRange); 89 } 90 91 U_NAMESPACE_END 92
