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.  Sun designates this

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

     8  * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    21  * CA 95054 USA or visit www.sun.com if you need additional information or

    22  * have any questions.

    23  *

    24  */

    25 

    26 /*

    27  *

    28  * (C) Copyright IBM Corp. 1998-2005 - All Rights Reserved

    29  *

    30  * This file is a modification of the ICU file IndicLayoutEngine.cpp

    31  * by Jens Herden and Javier Sola for Khmer language

    32  *

    33  */

    34 

    35 

    36 #include "OpenTypeLayoutEngine.h"

    37 #include "KhmerLayoutEngine.h"

    38 #include "LEGlyphStorage.h"

    39 #include "KhmerReordering.h"

    40 

    41 KhmerOpenTypeLayoutEngine::KhmerOpenTypeLayoutEngine(const LEFontInstance *fontInstance,

    42     le_int32 scriptCode, le_int32 languageCode, le_int32 typoFlags,

    43     const GlyphSubstitutionTableHeader *gsubTable)

    44     : OpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, gsubTable)

    45 {

    46     fFeatureMap   = KhmerReordering::getFeatureMap(fFeatureMapCount);

    47     fFeatureOrder = TRUE;

    48 }

    49 

    50 KhmerOpenTypeLayoutEngine::KhmerOpenTypeLayoutEngine(const LEFontInstance *fontInstance,

    51     le_int32 scriptCode, le_int32 languageCode, le_int32 typoFlags)

    52     : OpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags)

    53 {

    54     fFeatureMap   = KhmerReordering::getFeatureMap(fFeatureMapCount);

    55     fFeatureOrder = TRUE;

    56 }

    57 

    58 KhmerOpenTypeLayoutEngine::~KhmerOpenTypeLayoutEngine()

    59 {

    60     // nothing to do

    61 }

    62 

    63 // Input: characters

    64 // Output: characters, char indices, tags

    65 // Returns: output character count

    66 le_int32 KhmerOpenTypeLayoutEngine::characterProcessing(const LEUnicode chars[],

    67     le_int32 offset, le_int32 count, le_int32 max, le_bool rightToLeft,

    68     LEUnicode *&outChars, LEGlyphStorage &glyphStorage, LEErrorCode &success)

    69 {

    70     if (LE_FAILURE(success)) {

    71         return 0;

    72     }

    73 

    74     if (chars == NULL || offset < 0 || count < 0 || max < 0 ||

    75         offset >= max || offset + count > max) {

    76         success = LE_ILLEGAL_ARGUMENT_ERROR;

    77         return 0;

    78     }

    79 

    80     le_int32 worstCase = count * 3;  // worst case is 3 for Khmer  TODO check if 2 is enough

    81 

    82     outChars = LE_NEW_ARRAY(LEUnicode, worstCase);

    83 

    84     if (outChars == NULL) {

    85         success = LE_MEMORY_ALLOCATION_ERROR;

    86         return 0;

    87     }

    88 

    89     glyphStorage.allocateGlyphArray(worstCase, rightToLeft, success);

    90     glyphStorage.allocateAuxData(success);

    91 

    92     if (LE_FAILURE(success)) {

    93         LE_DELETE_ARRAY(outChars);

    94         return 0;

    95     }

    96 

    97     // NOTE: assumes this allocates featureTags...

    98     // (probably better than doing the worst case stuff here...)

    99     le_int32 outCharCount = KhmerReordering::reorder(&chars[offset], count,

   100         fScriptCode, outChars, glyphStorage);

   101 

   102     glyphStorage.adoptGlyphCount(outCharCount);

   103     return outCharCount;

   104 }