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. 1998-2010 - All Rights Reserved 29 * 30 * Developed at DIT - Government of Bhutan 31 * 32 * Contact person: Pema Geyleg - <pema_geyleg@druknet.bt> 33 * 34 * This file is a modification of the ICU file KhmerReordering.cpp 35 * by Jens Herden and Javier Sola who have given all their possible rights to IBM and the Governement of Bhutan 36 * A first module for Dzongkha was developed by Karunakar under Panlocalisation funding. 37 * Assistance for this module has been received from Namgay Thinley, Christopher Fynn and Javier Sola 38 * 39 */ 40 41#ifndef __TIBETANLAYOUTENGINE_H 42#define __TIBETANLAYOUTENGINE_H 43 44// #include "LETypes.h" 45// #include "LEFontInstance.h" 46// #include "LEGlyphFilter.h" 47// #include "LayoutEngine.h" 48// #include "OpenTypeLayoutEngine.h" 49 50// #include "GlyphSubstitutionTables.h" 51// #include "GlyphDefinitionTables.h" 52// #include "GlyphPositioningTables.h" 53 54U_NAMESPACE_BEGIN 55 56// class MPreFixups; 57// class LEGlyphStorage; 58 59/** 60 * This class implements OpenType layout for Dzongkha and Tibetan OpenType fonts 61 * 62 * @internal 63 */ 64class TibetanOpenTypeLayoutEngine : public OpenTypeLayoutEngine 65{ 66public: 67 /** 68 * This is the main constructor. It constructs an instance of TibetanOpenTypeLayoutEngine for 69 * a particular font, script and language. It takes the GSUB table as a parameter since 70 * LayoutEngine::layoutEngineFactory has to read the GSUB table to know that it has an 71 * Tibetan OpenType font. 72 * 73 * @param fontInstance - the font 74 * @param scriptCode - the script 75 * @param langaugeCode - the language 76 * @param gsubTable - the GSUB table 77 * @param success - set to an error code if the operation fails 78 * 79 * @see LayoutEngine::layoutEngineFactory 80 * @see OpenTypeLayoutEngine 81 * @see ScriptAndLangaugeTags.h for script and language codes 82 * 83 * @internal 84 */ 85 TibetanOpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode, 86 le_int32 typoFlags, const LEReferenceTo<GlyphSubstitutionTableHeader> &gsubTable, LEErrorCode &success); 87 88 /** 89 * This constructor is used when the font requires a "canned" GSUB table which can't be known 90 * until after this constructor has been invoked. 91 * 92 * @param fontInstance - the font 93 * @param scriptCode - the script 94 * @param langaugeCode - the language 95 * @param success - set to an error code if the operation fails 96 * 97 * @see OpenTypeLayoutEngine 98 * @see ScriptAndLangaugeTags.h for script and language codes 99 * 100 * @internal 101 */ 102 TibetanOpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode, 103 le_int32 typoFlags, LEErrorCode &success); 104 105 /** 106 * The destructor, virtual for correct polymorphic invocation. 107 * 108 * @internal 109 */ 110 virtual ~TibetanOpenTypeLayoutEngine(); 111 112 /** 113 * ICU "poor man's RTTI", returns a UClassID for the actual class. 114 * 115 * @internal ICU 3.6 116 */ 117 virtual UClassID getDynamicClassID() const; 118 119 /** 120 * ICU "poor man's RTTI", returns a UClassID for this class. 121 * 122 * @internal ICU 3.6 123 */ 124 static UClassID getStaticClassID(); 125 126protected: 127 128 /** 129 * This method does Tibetan OpenType character processing. It assigns the OpenType feature 130 * tags to the characters, and may generate output characters which have been reordered. 131 * It may also split some vowels, resulting in more output characters than input characters. 132 * 133 * Input parameters: 134 * @param chars - the input character context 135 * @param offset - the index of the first character to process 136 * @param count - the number of characters to process 137 * @param max - the number of characters in the input context 138 * @param rightToLeft - <code>TRUE</code> if the characters are in a right to left directional run 139 * @param glyphStorage - the glyph storage object. The glyph and character index arrays will be set. 140 * the auxillary data array will be set to the feature tags. 141 * 142 * Output parameters: 143 * @param success - set to an error code if the operation fails 144 * 145 * @return the output character count 146 * 147 * @internal 148 */ 149 virtual le_int32 characterProcessing(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool rightToLeft, 150 LEUnicode *&outChars, LEGlyphStorage &glyphStorage, LEErrorCode &success); 151 152}; 153 154U_NAMESPACE_END 155#endif 156 157