icuSources/layout/KhmerLayoutEngine.cpp

   1
   2 /*
   3  * (C) Copyright IBM Corp. 1998-2013 - All Rights Reserved
   4  *
   5  * This file is a modification of the ICU file IndicLayoutEngine.cpp
   6  * by Jens Herden and Javier Sola for Khmer language
   7  *
   8  */
   9
  10
  11 #include "OpenTypeLayoutEngine.h"
  12 #include "KhmerLayoutEngine.h"
  13 #include "LEGlyphStorage.h"
  14 #include "KhmerReordering.h"
  15
  16 U_NAMESPACE_BEGIN
  17
  18 UOBJECT_DEFINE_RTTI_IMPLEMENTATION(KhmerOpenTypeLayoutEngine)
  19
  20 KhmerOpenTypeLayoutEngine::KhmerOpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode,
  21                                                      le_int32 typoFlags, const LEReferenceTo<GlyphSubstitutionTableHeader> &gsubTable, LEErrorCode &success)
  22     : OpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, gsubTable, success)
  23 {
  24     fFeatureMap   = KhmerReordering::getFeatureMap(fFeatureMapCount);
  25     fFeatureOrder = TRUE;
  26 }
  27
  28 KhmerOpenTypeLayoutEngine::KhmerOpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode,
  29                                                      le_int32 typoFlags, LEErrorCode &success)
  30     : OpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, success)
  31 {
  32     fFeatureMap   = KhmerReordering::getFeatureMap(fFeatureMapCount);
  33     fFeatureOrder = TRUE;
  34 }
  35
  36 KhmerOpenTypeLayoutEngine::~KhmerOpenTypeLayoutEngine()
  37 {
  38     // nothing to do
  39 }
  40
  41 // Input: characters
  42 // Output: characters, char indices, tags
  43 // Returns: output character count
  44 le_int32 KhmerOpenTypeLayoutEngine::characterProcessing(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool rightToLeft,
  45         LEUnicode *&outChars, LEGlyphStorage &glyphStorage, LEErrorCode &success)
  46 {
  47     if (LE_FAILURE(success)) {
  48         return 0;
  49     }
  50
  51     if (chars == NULL || offset < 0 || count < 0 || max < 0 || offset >= max || offset + count > max) {
  52         success = LE_ILLEGAL_ARGUMENT_ERROR;
  53         return 0;
  54     }
  55
  56     le_int32 worstCase = count * 3;  // worst case is 3 for Khmer  TODO check if 2 is enough
  57
  58     outChars = LE_NEW_ARRAY(LEUnicode, worstCase);
  59
  60     if (outChars == NULL) {
  61         success = LE_MEMORY_ALLOCATION_ERROR;
  62         return 0;
  63     }
  64
  65     glyphStorage.allocateGlyphArray(worstCase, rightToLeft, success);
  66     glyphStorage.allocateAuxData(success);
  67
  68     if (LE_FAILURE(success)) {
  69         LE_DELETE_ARRAY(outChars);
  70         return 0;
  71     }
  72
  73     // NOTE: assumes this allocates featureTags...
  74     // (probably better than doing the worst case stuff here...)
  75     le_int32 outCharCount = KhmerReordering::reorder(&chars[offset], count, fScriptCode, outChars, glyphStorage);
  76
  77     glyphStorage.adoptGlyphCount(outCharCount);
  78     return outCharCount;
  79 }
  80
  81 U_NAMESPACE_END