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  *
  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 }