icuSources/layout/HanLayoutEngine.cpp

   1 /*
   2  * HanLayoutEngine.cpp: OpenType processing for Han fonts.
   3  *
   4  * (C) Copyright IBM Corp. 1998-2004 - 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
  17 U_NAMESPACE_BEGIN
  18
  19 UOBJECT_DEFINE_RTTI_IMPLEMENTATION(HanOpenTypeLayoutEngine)
  20
  21 HanOpenTypeLayoutEngine::HanOpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode,
  22                         const GlyphSubstitutionTableHeader *gsubTable)
  23     : OpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, gsubTable)
  24 {
  25     // nothing else to do...
  26 }
  27
  28 HanOpenTypeLayoutEngine::~HanOpenTypeLayoutEngine()
  29 {
  30     // nothing to do
  31 }
  32
  33 static const LETag emptyTag = 0x00000000;
  34
  35 static const LETag loclFeatureTag = LE_LOCL_FEATURE_TAG;
  36 static const LETag smplFeatureTag = LE_SMPL_FEATURE_TAG;
  37 static const LETag tradFeatureTag = LE_TRAD_FEATURE_TAG;
  38
  39 static const LETag features[] = {loclFeatureTag, emptyTag};
  40
  41 le_int32 HanOpenTypeLayoutEngine::characterProcessing(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool /*rightToLeft*/,
  42         LEUnicode *&/*outChars*/, LEGlyphStorage &glyphStorage, LEErrorCode &success)
  43 {
  44     if (LE_FAILURE(success)) {
  45         return 0;
  46     }
  47
  48     if (chars == NULL || offset < 0 || count < 0 || max < 0 || offset >= max || offset + count > max) {
  49         success = LE_ILLEGAL_ARGUMENT_ERROR;
  50         return 0;
  51     }
  52
  53     glyphStorage.allocateGlyphArray(count, FALSE, success);
  54     glyphStorage.allocateAuxData(success);
  55
  56     if (LE_FAILURE(success)) {
  57         return 0;
  58     }
  59
  60     // FIXME: do we want to add the 'trad' feature for 'ZHT' and the
  61     // 'smpl' feature for 'ZHS'? If we do this, we can remove the exact
  62     // flag from the language tag lookups, so we can use these features
  63     // with the default LangSys...
  64     for (le_int32 i = 0; i < count; i += 1) {
  65         glyphStorage.setAuxData(i, (void *) features, success);
  66     }
  67
  68     return count;
  69 }
  70
  71 U_NAMESPACE_END