88 lines
1.8 KiB
C++
88 lines
1.8 KiB
C++
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/*
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* @(#)CoverageTables.cpp 1.5 00/03/15
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*
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* (C) Copyright IBM Corp. 1998, 1999, 2000 - All Rights Reserved
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*
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*/
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#include "LETypes.h"
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#include "OpenTypeTables.h"
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#include "OpenTypeUtilities.h"
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#include "CoverageTables.h"
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#include "LESwaps.h"
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le_int32 CoverageTable::getGlyphCoverage(LEGlyphID glyphID)
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{
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switch(SWAPW(coverageFormat))
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{
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case 0:
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return -1;
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case 1:
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{
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CoverageFormat1Table *f1Table = (CoverageFormat1Table *) this;
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return f1Table->getGlyphCoverage(glyphID);
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}
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case 2:
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{
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CoverageFormat2Table *f2Table = (CoverageFormat2Table *) this;
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return f2Table->getGlyphCoverage(glyphID);
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}
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default:
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return -1;
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}
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}
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le_int32 CoverageFormat1Table::getGlyphCoverage(LEGlyphID glyphID)
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{
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le_uint16 count = SWAPW(glyphCount);
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le_uint8 bit = OpenTypeUtilities::highBit(count);
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le_uint16 power = 1 << bit;
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le_uint16 extra = count - power;
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le_uint16 probe = power;
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le_uint16 index = 0;
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if (SWAPW(glyphArray[extra]) <= glyphID)
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{
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index = extra;
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}
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while (probe > (1 << 0))
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{
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probe >>= 1;
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if (SWAPW(glyphArray[index + probe]) <= glyphID)
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{
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index += probe;
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}
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}
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if (SWAPW(glyphArray[index]) == glyphID)
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{
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return index;
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}
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return -1;
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}
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le_int32 CoverageFormat2Table::getGlyphCoverage(LEGlyphID glyphID)
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{
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le_uint16 count = SWAPW(rangeCount);
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le_int32 rangeIndex =
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OpenTypeUtilities::getGlyphRangeIndex(glyphID, rangeRecordArray, count);
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if (rangeIndex < 0)
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{
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return -1;
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}
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LEGlyphID firstInRange = SWAPW(rangeRecordArray[rangeIndex].firstGlyph);
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le_uint16 startCoverageIndex = SWAPW(rangeRecordArray[rangeIndex].rangeValue);
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return startCoverageIndex + (glyphID - firstInRange);
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}
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