| | 1 | /* |
| | 2 | * @(#)DeviceTables.cpp 1.5 00/03/15 |
| | 3 | * |
| | 4 | * (C) Copyright IBM Corp. 1998 - 2006 - All Rights Reserved |
| | 5 | * |
| | 6 | */ |
| | 7 | |
| | 8 | #include "LETypes.h" |
| | 9 | #include "OpenTypeTables.h" |
| | 10 | #include "DeviceTables.h" |
| | 11 | #include "LESwaps.h" |
| | 12 | |
| | 13 | U_NAMESPACE_BEGIN |
| | 14 | |
| | 15 | const le_uint16 DeviceTable::fieldMasks[] = {0x0003, 0x000F, 0x00FF}; |
| | 16 | const le_uint16 DeviceTable::fieldSignBits[] = {0x0002, 0x0008, 0x0080}; |
| | 17 | const le_uint16 DeviceTable::fieldBits[] = { 2, 4, 8}; |
| | 18 | |
| | 19 | #define FORMAT_COUNT LE_ARRAY_SIZE(fieldBits) |
| | 20 | |
| | 21 | le_int16 DeviceTable::getAdjustment(le_uint16 ppem) const |
| | 22 | { |
| | 23 | le_uint16 start = SWAPW(startSize); |
| | 24 | le_uint16 format = SWAPW(deltaFormat) - 1; |
| | 25 | le_int16 result = 0; |
| | 26 | |
| | 27 | if (ppem >= start && ppem <= SWAPW(endSize) && format < FORMAT_COUNT) { |
| | 28 | le_uint16 sizeIndex = ppem - start; |
| | 29 | le_uint16 bits = fieldBits[format]; |
| | 30 | le_uint16 count = 16 / bits; |
| | 31 | le_uint16 word = SWAPW(deltaValues[sizeIndex / count]); |
| | 32 | le_uint16 fieldIndex = sizeIndex % count; |
| | 33 | le_uint16 shift = 16 - (bits * (fieldIndex + 1)); |
| | 34 | le_uint16 field = (word >> shift) & fieldMasks[format]; |
| | 35 | |
| | 36 | result = field; |
| | 37 | |
| | 38 | if ((field & fieldSignBits[format]) != 0) { |
| | 39 | result |= ~ fieldMasks[format]; |
| | 40 | } |
| | 41 | } |
| | 42 | |
| | 43 | return result; |
| | 44 | } |
| | 45 | |
| | 46 | U_NAMESPACE_END |
projects / apple / icu.git / blame_incremental