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 

    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                         le_int32 typoFlags, const GlyphSubstitutionTableHeader *gsubTable)

    23     : OpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, 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