icuSources/layout/HanLayoutEngine.cpp

   1 /*
   2  * HanLayoutEngine.cpp: OpenType processing for Han fonts.
   3  *
   4  * (C) Copyright IBM Corp. 1998-2005 - All Rights Reserved.
   5  */
   6
   7 #include "LETypes.h"
   8 #include "LEScripts.h"
   9 #include "LELanguages.h"
  10
  11 #include "LayoutEngine.h"
  12 #include "OpenTypeLayoutEngine.h"
  13 #include "HanLayoutEngine.h"
  14 #include "ScriptAndLanguageTags.h"
  15 #include "LEGlyphStorage.h"
  16 #include "OpenTypeTables.h"
  17
  18 U_NAMESPACE_BEGIN
  19
  20 UOBJECT_DEFINE_RTTI_IMPLEMENTATION(HanOpenTypeLayoutEngine)
  21
  22 #define loclFeatureTag LE_LOCL_FEATURE_TAG
  23 #define smplFeatureTag LE_SMPL_FEATURE_TAG
  24 #define tradFeatureTag LE_TRAD_FEATURE_TAG
  25
  26 #define loclFeatureMask 0x80000000UL
  27 #define smplFeatureMask 0x40000000UL
  28 #define tradFeatureMask 0x20000000UL
  29
  30 static const FeatureMap featureMap[] =
  31 {
  32     {loclFeatureTag, loclFeatureMask},
  33     {smplFeatureTag, smplFeatureMask},
  34     {tradFeatureTag, tradFeatureMask}
  35 };
  36
  37 static const le_int32 featureMapCount = LE_ARRAY_SIZE(featureMap);
  38
  39 #define features (loclFeatureMask)
  40
  41 HanOpenTypeLayoutEngine::HanOpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode,
  42                         le_int32 typoFlags, const GlyphSubstitutionTableHeader *gsubTable)
  43     : OpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, gsubTable)
  44 {
  45     fFeatureMap      = featureMap;
  46     fFeatureMapCount = featureMapCount;
  47 }
  48
  49 HanOpenTypeLayoutEngine::~HanOpenTypeLayoutEngine()
  50 {
  51     // nothing to do
  52 }
  53
  54 le_int32 HanOpenTypeLayoutEngine::characterProcessing(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool /*rightToLeft*/,
  55         LEUnicode *&/*outChars*/, LEGlyphStorage &glyphStorage, LEErrorCode &success)
  56 {
  57     if (LE_FAILURE(success)) {
  58         return 0;
  59     }
  60
  61     if (chars == NULL || offset < 0 || count < 0 || max < 0 || offset >= max || offset + count > max) {
  62         success = LE_ILLEGAL_ARGUMENT_ERROR;
  63         return 0;
  64     }
  65
  66     glyphStorage.allocateGlyphArray(count, FALSE, success);
  67     glyphStorage.allocateAuxData(success);
  68
  69     if (LE_FAILURE(success)) {
  70         return 0;
  71     }
  72
  73     // FIXME: do we want to add the 'trad' feature for 'ZHT' and the
  74     // 'smpl' feature for 'ZHS'? If we do this, we can remove the exact
  75     // flag from the language tag lookups, so we can use these features
  76     // with the default LangSys...
  77     for (le_int32 i = 0; i < count; i += 1) {
  78         glyphStorage.setAuxData(i, features, success);
  79     }
  80
  81     return count;
  82 }
  83
  84 U_NAMESPACE_END