1 /*

     2  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     3  *

     4  * This code is free software; you can redistribute it and/or modify it

     5  * under the terms of the GNU General Public License version 2 only, as

     6  * published by the Free Software Foundation.  Oracle designates this

     7  * particular file as subject to the "Classpath" exception as provided

     8  * by Oracle in the LICENSE file that accompanied this code.

     9  *

    10  * This code is distributed in the hope that it will be useful, but WITHOUT

    11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    13  * version 2 for more details (a copy is included in the LICENSE file that

    14  * accompanied this code).

    15  *

    16  * You should have received a copy of the GNU General Public License version

    17  * 2 along with this work; if not, write to the Free Software Foundation,

    18  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    19  *

    20  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    21  * or visit www.oracle.com if you need additional information or have any

    22  * questions.

    23  *

    24  */

    25 

    26 /*

    27  * HanLayoutEngine.cpp: OpenType processing for Han fonts.

    28  *

    29  * (C) Copyright IBM Corp. 1998-2008 - All Rights Reserved.

    30  */

    31 

    32 #include "LETypes.h"

    33 #include "LEScripts.h"

    34 #include "LELanguages.h"

    35 

    36 #include "LayoutEngine.h"

    37 #include "OpenTypeLayoutEngine.h"

    38 #include "HanLayoutEngine.h"

    39 #include "ScriptAndLanguageTags.h"

    40 #include "LEGlyphStorage.h"

    41 #include "OpenTypeTables.h"

    42 

    43 U_NAMESPACE_BEGIN

    44 

    45 UOBJECT_DEFINE_RTTI_IMPLEMENTATION(HanOpenTypeLayoutEngine)

    46 

    47 #define loclFeatureTag LE_LOCL_FEATURE_TAG

    48 #define smplFeatureTag LE_SMPL_FEATURE_TAG

    49 #define tradFeatureTag LE_TRAD_FEATURE_TAG

    50 

    51 #define loclFeatureMask 0x80000000UL

    52 #define smplFeatureMask 0x40000000UL

    53 #define tradFeatureMask 0x20000000UL

    54 

    55 static const FeatureMap featureMap[] =

    56 {

    57     {loclFeatureTag, loclFeatureMask},

    58     {smplFeatureTag, smplFeatureMask},

    59     {tradFeatureTag, tradFeatureMask}

    60 };

    61 

    62 static const le_int32 featureMapCount = LE_ARRAY_SIZE(featureMap);

    63 

    64 #define features (loclFeatureMask)

    65 

    66 HanOpenTypeLayoutEngine::HanOpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode,

    67                                                  le_int32 typoFlags, const LEReferenceTo<GlyphSubstitutionTableHeader> &gsubTable, LEErrorCode &success)

    68     : OpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, gsubTable, success)

    69 {

    70     fFeatureMap      = featureMap;

    71     fFeatureMapCount = featureMapCount;

    72 }

    73 

    74 HanOpenTypeLayoutEngine::~HanOpenTypeLayoutEngine()

    75 {

    76     // nothing to do

    77 }

    78 

    79 le_int32 HanOpenTypeLayoutEngine::characterProcessing(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool /*rightToLeft*/,

    80         LEUnicode *&/*outChars*/, LEGlyphStorage &glyphStorage, LEErrorCode &success)

    81 {

    82     if (LE_FAILURE(success)) {

    83         return 0;

    84     }

    85 

    86     if (chars == NULL || offset < 0 || count < 0 || max < 0 || offset >= max || offset + count > max) {

    87         success = LE_ILLEGAL_ARGUMENT_ERROR;

    88         return 0;

    89     }

    90 

    91     glyphStorage.allocateGlyphArray(count, FALSE, success);

    92     glyphStorage.allocateAuxData(success);

    93 

    94     if (LE_FAILURE(success)) {

    95         return 0;

    96     }

    97 

    98     // FIXME: do we want to add the 'trad' feature for 'ZHT' and the

    99     // 'smpl' feature for 'ZHS'? If we do this, we can remove the exact

   100     // flag from the language tag lookups, so we can use these features

   101     // with the default LangSys...

   102     for (le_int32 i = 0; i < count; i += 1) {

   103         glyphStorage.setAuxData(i, features, success);

   104     }

   105 

   106     return count;

   107 }

   108 

   109 U_NAMESPACE_END