projects / apple / icu.git / blame
| Commit | Line | Data |
|---|---|---|
| b75a7d8f | 1 | /* |
| b75a7d8f | 2 | * |
| 374ca955 | 3 | * (C) Copyright IBM Corp. 1998-2004 - All Rights Reserved |
| b75a7d8f A |
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 (SWAPW(glyphArray[extra]) <= ttGlyphID) { | |
| 52 | index = extra; | |
| 53 | } | |
| 54 | ||
| 55 | while (probe > (1 << 0)) { | |
| 56 | probe >>= 1; | |
| 57 | ||
| 58 | if (SWAPW(glyphArray[index + probe]) <= ttGlyphID) { | |
| 59 | index += probe; | |
| 60 | } | |
| 61 | } | |
| 62 | ||
| 63 | if (SWAPW(glyphArray[index]) == ttGlyphID) { | |
| 64 | return index; | |
| 65 | } | |
| 66 | ||
| 67 | return -1; | |
| 68 | } | |
| 69 | ||
| 70 | le_int32 CoverageFormat2Table::getGlyphCoverage(LEGlyphID glyphID) const | |
| 71 | { | |
| 72 | TTGlyphID ttGlyphID = (TTGlyphID) LE_GET_GLYPH(glyphID); | |
| 73 | le_uint16 count = SWAPW(rangeCount); | |
| 74 | le_int32 rangeIndex = | |
| 75 | OpenTypeUtilities::getGlyphRangeIndex(ttGlyphID, rangeRecordArray, count); | |
| 76 | ||
| 77 | if (rangeIndex < 0) { | |
| 78 | return -1; | |
| 79 | } | |
| 80 | ||
| 81 | TTGlyphID firstInRange = SWAPW(rangeRecordArray[rangeIndex].firstGlyph); | |
| 82 | le_uint16 startCoverageIndex = SWAPW(rangeRecordArray[rangeIndex].rangeValue); | |
| 83 | ||
| 84 | return startCoverageIndex + (ttGlyphID - firstInRange); | |
| 85 | } | |
| 86 | ||
| 87 | U_NAMESPACE_END |