1 

     2 /*

     3  *

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

     5  *

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

     7  * by Jens Herden and Javier Sola for Khmer language 

     8  *

     9  */

    10 

    11 

    12 #include "OpenTypeLayoutEngine.h"

    13 #include "KhmerLayoutEngine.h"

    14 #include "LEGlyphStorage.h"

    15 #include "KhmerReordering.h"

    16 

    17 U_NAMESPACE_BEGIN

    18 

    19 UOBJECT_DEFINE_RTTI_IMPLEMENTATION(KhmerOpenTypeLayoutEngine)

    20 

    21 KhmerOpenTypeLayoutEngine::KhmerOpenTypeLayoutEngine(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     fFeatureOrder = KhmerReordering::getFeatureOrder();

    26 }

    27 

    28 KhmerOpenTypeLayoutEngine::KhmerOpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode,

    29 						     le_int32 typoFlags)

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

    31 {

    32     fFeatureOrder = KhmerReordering::getFeatureOrder();

    33 }

    34 

    35 KhmerOpenTypeLayoutEngine::~KhmerOpenTypeLayoutEngine()

    36 {

    37     // nothing to do

    38 }

    39 

    40 // Input: characters

    41 // Output: characters, char indices, tags

    42 // Returns: output character count

    43 le_int32 KhmerOpenTypeLayoutEngine::characterProcessing(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool rightToLeft,

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

    45 {

    46     if (LE_FAILURE(success)) {

    47         return 0;

    48     }

    49 

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

    51         success = LE_ILLEGAL_ARGUMENT_ERROR;

    52         return 0;

    53     }

    54 

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

    56 

    57     outChars = LE_NEW_ARRAY(LEUnicode, worstCase);

    58 

    59     if (outChars == NULL) {

    60         success = LE_MEMORY_ALLOCATION_ERROR;

    61         return 0;

    62     }

    63 

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

    65     glyphStorage.allocateAuxData(success);

    66 

    67     if (LE_FAILURE(success)) {

    68         LE_DELETE_ARRAY(outChars);

    69         return 0;

    70     }

    71 

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

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

    74     le_int32 outCharCount = KhmerReordering::reorder(&chars[offset], count, fScriptCode, outChars, glyphStorage);

    75 

    76     glyphStorage.adoptGlyphCount(outCharCount);

    77     return outCharCount;

    78 }

    79 

    80 U_NAMESPACE_END