sl@0: /*
sl@0:  *
sl@0:  * (C) Copyright IBM Corp. 1998-2004 - All Rights Reserved
sl@0:  *
sl@0:  */
sl@0: 
sl@0: #include "LETypes.h"
sl@0: #include "OpenTypeTables.h"
sl@0: #include "OpenTypeUtilities.h"
sl@0: #include "CoverageTables.h"
sl@0: #include "LESwaps.h"
sl@0: 
sl@0: U_NAMESPACE_BEGIN
sl@0: 
sl@0: le_int32 CoverageTable::getGlyphCoverage(LEGlyphID glyphID) const
sl@0: {
sl@0:     switch(SWAPW(coverageFormat))
sl@0:     {
sl@0:     case 0:
sl@0:         return -1;
sl@0: 
sl@0:     case 1:
sl@0:     {
sl@0:         const CoverageFormat1Table *f1Table = (const CoverageFormat1Table *) this;
sl@0: 
sl@0:         return f1Table->getGlyphCoverage(glyphID);
sl@0:     }
sl@0: 
sl@0:     case 2:
sl@0:     {
sl@0:         const CoverageFormat2Table *f2Table = (const CoverageFormat2Table *) this;
sl@0: 
sl@0:         return f2Table->getGlyphCoverage(glyphID);
sl@0:     }
sl@0: 
sl@0:     default:
sl@0:         return -1;
sl@0:     }
sl@0: }
sl@0: 
sl@0: le_int32 CoverageFormat1Table::getGlyphCoverage(LEGlyphID glyphID) const
sl@0: {
sl@0:     TTGlyphID ttGlyphID = (TTGlyphID) LE_GET_GLYPH(glyphID);
sl@0:     le_uint16 count = SWAPW(glyphCount);
sl@0:     le_uint8 bit = OpenTypeUtilities::highBit(count);
sl@0:     le_uint16 power = 1 << bit;
sl@0:     le_uint16 extra = count - power;
sl@0:     le_uint16 probe = power;
sl@0:     le_uint16 index = 0;
sl@0: 
sl@0:     if (SWAPW(glyphArray[extra]) <= ttGlyphID) {
sl@0:         index = extra;
sl@0:     }
sl@0: 
sl@0:     while (probe > (1 << 0)) {
sl@0:         probe >>= 1;
sl@0: 
sl@0:         if (SWAPW(glyphArray[index + probe]) <= ttGlyphID) {
sl@0:             index += probe;
sl@0:         }
sl@0:     }
sl@0: 
sl@0:     if (SWAPW(glyphArray[index]) == ttGlyphID) {
sl@0:         return index;
sl@0:     }
sl@0: 
sl@0:     return -1;
sl@0: }
sl@0: 
sl@0: le_int32 CoverageFormat2Table::getGlyphCoverage(LEGlyphID glyphID) const
sl@0: {
sl@0:     TTGlyphID ttGlyphID = (TTGlyphID) LE_GET_GLYPH(glyphID);
sl@0:     le_uint16 count = SWAPW(rangeCount);
sl@0:     le_int32 rangeIndex =
sl@0:         OpenTypeUtilities::getGlyphRangeIndex(ttGlyphID, rangeRecordArray, count);
sl@0: 
sl@0:     if (rangeIndex < 0) {
sl@0:         return -1;
sl@0:     }
sl@0: 
sl@0:     TTGlyphID firstInRange = SWAPW(rangeRecordArray[rangeIndex].firstGlyph);
sl@0:     le_uint16  startCoverageIndex = SWAPW(rangeRecordArray[rangeIndex].rangeValue);
sl@0: 
sl@0:     return startCoverageIndex + (ttGlyphID - firstInRange);
sl@0: }
sl@0: 
sl@0: U_NAMESPACE_END