1 2 /* 3 * (C) Copyright IBM Corp. 1998-2008 - 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 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 82
