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 #include "LETypes.h"
33 #include "LEGlyphFilter.h"
34 #include "OpenTypeTables.h"
35 #include "LEGlyphStorage.h"
36 #include "ThaiShaping.h"
37
38 U_NAMESPACE_BEGIN
39
40 enum {
41 CH_SPACE = 0x0020,
42 CH_YAMAKKAN = 0x0E4E,
43 CH_MAI_HANAKAT = 0x0E31,
44 CH_SARA_AA = 0x0E32,
45 CH_SARA_AM = 0x0E33,
46 CH_SARA_UEE = 0x0E37,
47 CH_MAITAIKHU = 0x0E47,
48 CH_NIKHAHIT = 0x0E4D,
49 CH_SARA_U = 0x0E38,
50 CH_PHINTHU = 0x0E3A,
51 CH_YO_YING = 0x0E0D,
52 CH_THO_THAN = 0x0E10,
53 CH_DOTTED_CIRCLE = 0x25CC
54 };
55
56 le_uint8 ThaiShaping::getCharClass(LEUnicode ch)
57 {
58 le_uint8 charClass = NON;
59
60 if (ch >= 0x0E00 && ch <= 0x0E5B) {
61 charClass = classTable[ch - 0x0E00];
62 }
63
64 return charClass;
65 }
66
67
68 LEUnicode ThaiShaping::leftAboveVowel(LEUnicode vowel, le_uint8 glyphSet)
69 {
70 static const LEUnicode leftAboveVowels[][7] = {
71 {0x0E61, 0x0E32, 0x0E33, 0x0E64, 0x0E65, 0x0E66, 0x0E67},
72 {0xF710, 0x0E32, 0x0E33, 0xF701, 0xF702, 0xF703, 0xF704},
73 {0xF884, 0x0E32, 0x0E33, 0xF885, 0xF886, 0xF887, 0xF788},
74 {0x0E31, 0x0E32, 0x0E33, 0x0E34, 0x0E35, 0x0E36, 0x0E37}
75 };
76
77 if (vowel >= CH_MAI_HANAKAT && vowel <= CH_SARA_UEE) {
78 return leftAboveVowels[glyphSet][vowel - CH_MAI_HANAKAT];
79 }
80
81 if (vowel == CH_YAMAKKAN && glyphSet == 0) {
82 return 0x0E7E;
83 }
84
85 return vowel;
86 }
87
88 LEUnicode ThaiShaping::lowerRightTone(LEUnicode tone, le_uint8 glyphSet)
89 {
90 static const LEUnicode lowerRightTones[][7] = {
91 {0x0E68, 0x0E69, 0x0E6A, 0x0E6B, 0x0E6C, 0x0E6D, 0x0E6E},
92 {0x0E47, 0xF70A, 0xF70B, 0xF70C, 0xF70D, 0xF70E, 0x0E4D},
93 {0x0E47, 0xF88B, 0xF88E, 0xF891, 0xF894, 0xF897, 0x0E4D},
94 {0x0E47, 0x0E48, 0x0E49, 0x0E4A, 0x0E4B, 0x0E4C, 0x0E4D}
95 };
96
97 if (tone >= CH_MAITAIKHU && tone <= CH_NIKHAHIT) {
98 return lowerRightTones[glyphSet][tone - CH_MAITAIKHU];
99 }
100
101 return tone;
102 }
103
104 LEUnicode ThaiShaping::lowerLeftTone(LEUnicode tone, le_uint8 glyphSet)
105 {
106 static const LEUnicode lowerLeftTones[][7] = {
107 {0x0E76, 0x0E77, 0x0E78, 0x0E79, 0x0E7A, 0x0E7B, 0x0E7C},
108 {0xF712, 0xF705, 0xF706, 0xF707, 0xF708, 0xF709, 0xF711},
109 {0xF889, 0xF88C, 0xF88F, 0xF892, 0xF895, 0xF898, 0xF899},
110 {0x0E47, 0x0E48, 0x0E49, 0x0E4A, 0x0E4B, 0x0E4C, 0x0E4D}
111 };
112
113 if (tone >= CH_MAITAIKHU && tone <= CH_NIKHAHIT) {
114 return lowerLeftTones[glyphSet][tone - CH_MAITAIKHU];
115 }
116
117 return tone;
118 }
119
120 LEUnicode ThaiShaping::upperLeftTone(LEUnicode tone, le_uint8 glyphSet)
121 {
122 static const LEUnicode upperLeftTones[][7] = {
123 {0x0E6F, 0x0E70, 0x0E71, 0x0E72, 0x0E73, 0x0E74, 0x0E75},
124 {0xF712, 0xF713, 0xF714, 0xF715, 0xF716, 0xF717, 0xF711},
125 {0xF889, 0xF88A, 0xF88D, 0xF890, 0xF893, 0xF896, 0xF899},
126 {0x0E47, 0x0E48, 0x0E49, 0x0E4A, 0x0E4B, 0x0E4C, 0x0E4D}
127 };
128
129 if (tone >= CH_MAITAIKHU && tone <= CH_NIKHAHIT) {
130 return upperLeftTones[glyphSet][tone - CH_MAITAIKHU];
131 }
132
133 return tone;
134 }
135
136 LEUnicode ThaiShaping::lowerBelowVowel(LEUnicode vowel, le_uint8 glyphSet)
137 {
138 static const LEUnicode lowerBelowVowels[][3] = {
139 {0x0E3C, 0x0E3D, 0x0E3E},
140 {0xF718, 0xF719, 0xF71A},
141 {0x0E38, 0x0E39, 0x0E3A},
142 {0x0E38, 0x0E39, 0x0E3A}
143
144 };
145
146 if (vowel >= CH_SARA_U && vowel <= CH_PHINTHU) {
147 return lowerBelowVowels[glyphSet][vowel - CH_SARA_U];
148 }
149
150 return vowel;
151 }
152
153 LEUnicode ThaiShaping::noDescenderCOD(LEUnicode cod, le_uint8 glyphSet)
154 {
155 static const LEUnicode noDescenderCODs[][4] = {
156 {0x0E60, 0x0E0E, 0x0E0F, 0x0E63},
157 {0xF70F, 0x0E0E, 0x0E0F, 0xF700},
158 {0x0E0D, 0x0E0E, 0x0E0F, 0x0E10},
159 {0x0E0D, 0x0E0E, 0x0E0F, 0x0E10}
160
161 };
162
163 if (cod >= CH_YO_YING && cod <= CH_THO_THAN) {
164 return noDescenderCODs[glyphSet][cod - CH_YO_YING];
165 }
166
167 return cod;
168 }
169
170 le_uint8 ThaiShaping::doTransition (StateTransition transition, LEUnicode currChar, le_int32 inputIndex, le_uint8 glyphSet,
171 LEUnicode errorChar, LEUnicode *outputBuffer, LEGlyphStorage &glyphStorage, le_int32 &outputIndex)
172 {
173 LEErrorCode success = LE_NO_ERROR;
174
175 switch (transition.action) {
176 case tA:
177 glyphStorage.setCharIndex(outputIndex, inputIndex, success);
178 outputBuffer[outputIndex++] = currChar;
179 break;
180
181 case tC:
182 glyphStorage.setCharIndex(outputIndex, inputIndex, success);
183 outputBuffer[outputIndex++] = currChar;
184 break;
185
186 case tD:
187 glyphStorage.setCharIndex(outputIndex, inputIndex, success);
188 outputBuffer[outputIndex++] = leftAboveVowel(currChar, glyphSet);
189 break;
190
191 case tE:
192 glyphStorage.setCharIndex(outputIndex, inputIndex, success);
193 outputBuffer[outputIndex++] = lowerRightTone(currChar, glyphSet);
194 break;
195
196 case tF:
197 glyphStorage.setCharIndex(outputIndex, inputIndex, success);
198 outputBuffer[outputIndex++] = lowerLeftTone(currChar, glyphSet);
199 break;
200
201 case tG:
202 glyphStorage.setCharIndex(outputIndex, inputIndex, success);
203 outputBuffer[outputIndex++] = upperLeftTone(currChar, glyphSet);
204 break;
205
206 case tH:
207 {
208 LEUnicode cod = outputBuffer[outputIndex - 1];
209 LEUnicode coa = noDescenderCOD(cod, glyphSet);
210
211 if (cod != coa) {
212 outputBuffer[outputIndex - 1] = coa;
213
214 glyphStorage.setCharIndex(outputIndex, inputIndex, success);
215 outputBuffer[outputIndex++] = currChar;
216 break;
217 }
218
219 glyphStorage.setCharIndex(outputIndex, inputIndex, success);
220 outputBuffer[outputIndex++] = lowerBelowVowel(currChar, glyphSet);
221 break;
222 }
223
224 case tR:
225 glyphStorage.setCharIndex(outputIndex, inputIndex, success);
226 outputBuffer[outputIndex++] = errorChar;
227
228 glyphStorage.setCharIndex(outputIndex, inputIndex, success);
229 outputBuffer[outputIndex++] = currChar;
230 break;
231
232 case tS:
233 if (currChar == CH_SARA_AM) {
234 glyphStorage.setCharIndex(outputIndex, inputIndex, success);
235 outputBuffer[outputIndex++] = errorChar;
236 }
237
238 glyphStorage.setCharIndex(outputIndex, inputIndex, success);
239 outputBuffer[outputIndex++] = currChar;
240 break;
241
242 default:
243 // FIXME: if we get here, there's an error
244 // in the state table!
245 glyphStorage.setCharIndex(outputIndex, inputIndex, success);
246 outputBuffer[outputIndex++] = currChar;
247 break;
248 }
249
250 return transition.nextState;
251 }
252
253 le_uint8 ThaiShaping::getNextState(LEUnicode ch, le_uint8 prevState, le_int32 inputIndex, le_uint8 glyphSet, LEUnicode errorChar,
254 le_uint8 &charClass, LEUnicode *output, LEGlyphStorage &glyphStorage, le_int32 &outputIndex)
255 {
256 StateTransition transition;
257
258 charClass = getCharClass(ch);
259 transition = getTransition(prevState, charClass);
260
261 return doTransition(transition, ch, inputIndex, glyphSet, errorChar, output, glyphStorage, outputIndex);
262 }
263
264 le_bool ThaiShaping::isLegalHere(LEUnicode ch, le_uint8 prevState)
265 {
266 le_uint8 charClass = getCharClass(ch);
267 StateTransition transition = getTransition(prevState, charClass);
268
269 switch (transition.action) {
270 case tA:
271 case tC:
272 case tD:
273 case tE:
274 case tF:
275 case tG:
276 case tH:
277 return TRUE;
278
279 case tR:
280 case tS:
281 return FALSE;
282
283 default:
284 // FIXME: if we get here, there's an error
285 // in the state table!
286 return FALSE;
287 }
288 }
289
290 le_int32 ThaiShaping::compose(const LEUnicode *input, le_int32 offset, le_int32 charCount, le_uint8 glyphSet,
291 LEUnicode errorChar, LEUnicode *output, LEGlyphStorage &glyphStorage)
292 {
293 le_uint8 state = 0;
294 le_int32 inputIndex;
295 le_int32 outputIndex = 0;
296 le_uint8 conState = 0xFF;
297 le_int32 conInput = -1;
298 le_int32 conOutput = -1;
299
300 for (inputIndex = 0; inputIndex < charCount; inputIndex += 1) {
301 LEUnicode ch = input[inputIndex + offset];
302 le_uint8 charClass;
303
304 // Decompose SARA AM into NIKHAHIT + SARA AA
305 if (ch == CH_SARA_AM && isLegalHere(ch, state) && conState < stateCount) {
306 outputIndex = conOutput;
307 state = getNextState(CH_NIKHAHIT, conState, inputIndex, glyphSet, errorChar, charClass,
308 output, glyphStorage, outputIndex);
309
310 for (int j = conInput + 1; j < inputIndex; j += 1) {
311 ch = input[j + offset];
312 state = getNextState(ch, state, j, glyphSet, errorChar, charClass,
313 output, glyphStorage, outputIndex);
314 }
315
316 ch = CH_SARA_AA;
317 }
318
319 state = getNextState(ch, state, inputIndex, glyphSet, errorChar, charClass,
320 output, glyphStorage, outputIndex);
321
322 if (charClass >= CON && charClass <= COD) {
323 conState = state;
324 conInput = inputIndex;
325 conOutput = outputIndex;
326 }
327 }
328
329 return outputIndex;
330 }
331
332 U_NAMESPACE_END