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Viewing changes to source/layout/DeviceTables.cpp

  • Committer: Package Import Robot
  • Author(s): Jay Berkenbilt
  • Date: 2005-11-19 11:29:31 UTC
  • mfrom: (1.1.2)
  • Revision ID: package-import@ubuntu.com-20051119112931-vcizkrp10tli4enw
Tags: 3.4-3
Explicitly build with g++ 3.4.  The current ICU fails its test suite
with 4.0 but not with 3.4.  Future versions should work properly with
4.0.

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source/layout/DeviceTables.cpp
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/*
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 * @(#)DeviceTables.cpp 1.5 00/03/15
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 *
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 * (C) Copyright IBM Corp. 1998, 1999, 2000, 2001 - 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 "DeviceTables.h"
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#include "GlyphIterator.h"
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#include "GlyphPositionAdjustments.h"
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#include "LESwaps.h"
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U_NAMESPACE_BEGIN
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const le_uint16 DeviceTable::fieldMasks[]    = {0x0003, 0x000F, 0x00FF};
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const le_uint16 DeviceTable::fieldSignBits[] = {0x0002, 0x0008, 0x0080};
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const le_uint16 DeviceTable::fieldBits[]     = {     2,      4,      8};
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le_int16 DeviceTable::getAdjustment(le_uint16 ppem) const
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{
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    le_uint16 start = SWAPW(startSize);
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    le_uint16 format = SWAPW(deltaFormat) - 1;
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    le_int16 result = 0;
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    if (ppem >= start && ppem <= SWAPW(endSize)) {
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        le_uint16 sizeIndex = ppem - start;
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        le_uint16 bits = fieldBits[format];
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        le_uint16 count = 16 / bits;
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        le_uint16 word = SWAPW(deltaValues[sizeIndex / count]);
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        le_uint16 fieldIndex = sizeIndex % count;
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        le_uint16 shift = 16 - (bits * (fieldIndex + 1));
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        le_uint16 field = (word >> shift) & fieldMasks[format];
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        result = field;
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        if ((field & fieldSignBits[format]) != 0) {
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            result |= ! fieldMasks[format];
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        }
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    }
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    return result;
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}
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U_NAMESPACE_END