projects / apple / icu.git / blame
| Commit | Line | Data |
|---|---|---|
| b75a7d8f A |
1 | /* |
| 2 | * @(#)DeviceTables.cpp 1.5 00/03/15 | |
| 3 | * | |
| 46f4442e | 4 | * (C) Copyright IBM Corp. 1998 - 2006 - All Rights Reserved |
| b75a7d8f A |
5 | * |
| 6 | */ | |
| 7 | ||
| 8 | #include "LETypes.h" | |
| 9 | #include "OpenTypeTables.h" | |
| 10 | #include "DeviceTables.h" | |
| b75a7d8f A |
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 | ||
| 46f4442e A |
19 | #define FORMAT_COUNT LE_ARRAY_SIZE(fieldBits) |
| 20 | ||
| b75a7d8f A |
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 | ||
| 46f4442e | 27 | if (ppem >= start && ppem <= SWAPW(endSize) && format < FORMAT_COUNT) { |
| b75a7d8f A |
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) { | |
| 374ca955 | 39 | result |= ~ fieldMasks[format]; |
| b75a7d8f A |
40 | } |
| 41 | } | |
| 42 | ||
| 43 | return result; | |
| 44 | } | |
| 45 | ||
| 46 | U_NAMESPACE_END |