icuSources/layout/Features.cpp

   1 /*
   2  * @(#)Features.cpp 1.4 00/03/15
   3  *
   4  * (C) Copyright IBM Corp. 1998-2013 - All Rights Reserved
   5  *
   6  */
   7
   8 #include "LETypes.h"
   9 #include "OpenTypeUtilities.h"
  10 #include "OpenTypeTables.h"
  11 #include "ICUFeatures.h"
  12 #include "LESwaps.h"
  13
  14 U_NAMESPACE_BEGIN
  15
  16 LEReferenceTo<FeatureTable> FeatureListTable::getFeatureTable(const LETableReference &base, le_uint16 featureIndex, LETag *featureTag, LEErrorCode &success) const
  17 {
  18   if (featureIndex >= SWAPW(featureCount) || LE_FAILURE(success)) {
  19     return LEReferenceTo<FeatureTable>();
  20   }
  21
  22     Offset featureTableOffset = featureRecordArray[featureIndex].featureTableOffset;
  23
  24     *featureTag = SWAPT(featureRecordArray[featureIndex].featureTag);
  25
  26     return LEReferenceTo<FeatureTable>(base, success, SWAPW(featureTableOffset));
  27 }
  28
  29 #if 0
  30 /*
  31  * Note: according to the OpenType Spec. v 1.4, the entries in the Feature
  32  * List Table are sorted alphabetically by feature tag; however, there seem
  33  * to be some fonts which have an unsorted list; that's why the binary search
  34  * is #if 0'd out and replaced by a linear search.
  35  *
  36  * Also note: as of ICU 2.6, this method isn't called anyhow...
  37  */
  38 const FeatureTable *FeatureListTable::getFeatureTable(LETag featureTag) const
  39 {
  40 #if 0
  41     Offset featureTableOffset =
  42         OpenTypeUtilities::getTagOffset(featureTag, (TagAndOffsetRecord *) featureRecordArray, SWAPW(featureCount));
  43
  44     if (featureTableOffset == 0) {
  45         return 0;
  46     }
  47
  48     return (const FeatureTable *) ((char *) this + SWAPW(featureTableOffset));
  49 #else
  50     int count = SWAPW(featureCount);
  51
  52     for (int i = 0; i < count; i += 1) {
  53         if (SWAPT(featureRecordArray[i].featureTag) == featureTag) {
  54             return (const FeatureTable *) ((char *) this + SWAPW(featureRecordArray[i].featureTableOffset));
  55         }
  56     }
  57
  58     return 0;
  59 #endif
  60 }
  61 #endif
  62
  63 U_NAMESPACE_END