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. 1998-2004 - All Rights Reserved 29 * 30 */ 31 32#ifndef __CHARSUBSTITUTIONFILTER_H 33#define __CHARSUBSTITUTIONFILTER_H 34 35#include "LETypes.h" 36#include "LEGlyphFilter.h" 37 38U_NAMESPACE_BEGIN 39 40class LEFontInstance; 41 42/** 43 * This filter is used by character-based GSUB processors. It 44 * accepts only those characters which the given font can display. 45 * 46 * Note: Implementation is in ArabicLayoutEngine.cpp 47 * 48 * @internal 49 */ 50class CharSubstitutionFilter : public UMemory, public LEGlyphFilter 51{ 52private: 53 /** 54 * Holds the font which is used to test the characters. 55 * 56 * @internal 57 */ 58 const LEFontInstance *fFontInstance; 59 60 /** 61 * The copy constructor. Not allowed! 62 * 63 * @internal 64 */ 65 CharSubstitutionFilter(const CharSubstitutionFilter &other); // forbid copying of this class 66 67 /** 68 * The replacement operator. Not allowed! 69 * 70 * @internal 71 */ 72 CharSubstitutionFilter &operator=(const CharSubstitutionFilter &other); // forbid copying of this class 73 74public: 75 /** 76 * The constructor. 77 * 78 * @param fontInstance - the font to use to test the characters. 79 * 80 * @internal 81 */ 82 CharSubstitutionFilter(const LEFontInstance *fontInstance); 83 84 /** 85 * The destructor. 86 * 87 * @internal 88 */ 89 ~CharSubstitutionFilter(); 90 91 /** 92 * This method is used to test if a particular 93 * character can be displayed by the filter's 94 * font. 95 * 96 * @param glyph - the Unicode character code to be tested 97 * 98 * @return TRUE if the filter's font can display this character. 99 * 100 * @internal 101 */ 102 le_bool accept(LEGlyphID glyph, LEErrorCode &success) const; 103}; 104 105U_NAMESPACE_END 106#endif 107