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      1 /*
      2  * HanLayoutEngine.cpp: OpenType processing for Han fonts.
      3  *
      4  * (C) Copyright IBM Corp. 1998-2008 - 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, LEErrorCode &success)
     43     : OpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, gsubTable, success)
     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
     85