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Diffstat (limited to 'Build/source/libs/icu/icu-xetex/layout/ThaiShaping.cpp')
| -rw-r--r-- | Build/source/libs/icu/icu-xetex/layout/ThaiShaping.cpp | 307 |
1 files changed, 307 insertions, 0 deletions
diff --git a/Build/source/libs/icu/icu-xetex/layout/ThaiShaping.cpp b/Build/source/libs/icu/icu-xetex/layout/ThaiShaping.cpp new file mode 100644 index 00000000000..1680f0fe515 --- /dev/null +++ b/Build/source/libs/icu/icu-xetex/layout/ThaiShaping.cpp @@ -0,0 +1,307 @@ +/* + * + * (C) Copyright IBM Corp. 1998-2004 - All Rights Reserved + * + */ + +#include "LETypes.h" +#include "LEGlyphFilter.h" +#include "OpenTypeTables.h" +#include "LEGlyphStorage.h" +#include "ThaiShaping.h" + +U_NAMESPACE_BEGIN + +enum { + CH_SPACE = 0x0020, + CH_YAMAKKAN = 0x0E4E, + CH_MAI_HANAKAT = 0x0E31, + CH_SARA_AA = 0x0E32, + CH_SARA_AM = 0x0E33, + CH_SARA_UEE = 0x0E37, + CH_MAITAIKHU = 0x0E47, + CH_NIKHAHIT = 0x0E4D, + CH_SARA_U = 0x0E38, + CH_PHINTHU = 0x0E3A, + CH_YO_YING = 0x0E0D, + CH_THO_THAN = 0x0E10, + CH_DOTTED_CIRCLE = 0x25CC +}; + + le_uint8 ThaiShaping::getCharClass(LEUnicode ch) +{ + le_uint8 charClass = NON; + + if (ch >= 0x0E00 && ch <= 0x0E5B) { + charClass = classTable[ch - 0x0E00]; + } + + return charClass; +} + + +LEUnicode ThaiShaping::leftAboveVowel(LEUnicode vowel, le_uint8 glyphSet) +{ + static const LEUnicode leftAboveVowels[][7] = { + {0x0E61, 0x0E32, 0x0E33, 0x0E64, 0x0E65, 0x0E66, 0x0E67}, + {0xF710, 0x0E32, 0x0E33, 0xF701, 0xF702, 0xF703, 0xF704}, + {0xF884, 0x0E32, 0x0E33, 0xF885, 0xF886, 0xF887, 0xF788}, + {0x0E31, 0x0E32, 0x0E33, 0x0E34, 0x0E35, 0x0E36, 0x0E37} + }; + + if (vowel >= CH_MAI_HANAKAT && vowel <= CH_SARA_UEE) { + return leftAboveVowels[glyphSet][vowel - CH_MAI_HANAKAT]; + } + + if (vowel == CH_YAMAKKAN && glyphSet == 0) { + return 0x0E7E; + } + + return vowel; +} + +LEUnicode ThaiShaping::lowerRightTone(LEUnicode tone, le_uint8 glyphSet) +{ + static const LEUnicode lowerRightTones[][7] = { + {0x0E68, 0x0E69, 0x0E6A, 0x0E6B, 0x0E6C, 0x0E6D, 0x0E6E}, + {0x0E47, 0xF70A, 0xF70B, 0xF70C, 0xF70D, 0xF70E, 0x0E4D}, + {0x0E47, 0xF88B, 0xF88E, 0xF891, 0xF894, 0xF897, 0x0E4D}, + {0x0E47, 0x0E48, 0x0E49, 0x0E4A, 0x0E4B, 0x0E4C, 0x0E4D} + }; + + if (tone >= CH_MAITAIKHU && tone <= CH_NIKHAHIT) { + return lowerRightTones[glyphSet][tone - CH_MAITAIKHU]; + } + + return tone; +} + +LEUnicode ThaiShaping::lowerLeftTone(LEUnicode tone, le_uint8 glyphSet) +{ + static const LEUnicode lowerLeftTones[][7] = { + {0x0E76, 0x0E77, 0x0E78, 0x0E79, 0x0E7A, 0x0E7B, 0x0E7C}, + {0xF712, 0xF705, 0xF706, 0xF707, 0xF708, 0xF709, 0xF711}, + {0xF889, 0xF88C, 0xF88F, 0xF892, 0xF895, 0xF898, 0xF899}, + {0x0E47, 0x0E48, 0x0E49, 0x0E4A, 0x0E4B, 0x0E4C, 0x0E4D} + }; + + if (tone >= CH_MAITAIKHU && tone <= CH_NIKHAHIT) { + return lowerLeftTones[glyphSet][tone - CH_MAITAIKHU]; + } + + return tone; +} + +LEUnicode ThaiShaping::upperLeftTone(LEUnicode tone, le_uint8 glyphSet) +{ + static const LEUnicode upperLeftTones[][7] = { + {0x0E6F, 0x0E70, 0x0E71, 0x0E72, 0x0E73, 0x0E74, 0x0E75}, + {0xF712, 0xF713, 0xF714, 0xF715, 0xF716, 0xF717, 0xF711}, + {0xF889, 0xF88A, 0xF88D, 0xF890, 0xF893, 0xF896, 0xF899}, + {0x0E47, 0x0E48, 0x0E49, 0x0E4A, 0x0E4B, 0x0E4C, 0x0E4D} + }; + + if (tone >= CH_MAITAIKHU && tone <= CH_NIKHAHIT) { + return upperLeftTones[glyphSet][tone - CH_MAITAIKHU]; + } + + return tone; +} + +LEUnicode ThaiShaping::lowerBelowVowel(LEUnicode vowel, le_uint8 glyphSet) +{ + static const LEUnicode lowerBelowVowels[][3] = { + {0x0E3C, 0x0E3D, 0x0E3E}, + {0xF718, 0xF719, 0xF71A}, + {0x0E38, 0x0E39, 0x0E3A}, + {0x0E38, 0x0E39, 0x0E3A} + + }; + + if (vowel >= CH_SARA_U && vowel <= CH_PHINTHU) { + return lowerBelowVowels[glyphSet][vowel - CH_SARA_U]; + } + + return vowel; +} + +LEUnicode ThaiShaping::noDescenderCOD(LEUnicode cod, le_uint8 glyphSet) +{ + static const LEUnicode noDescenderCODs[][4] = { + {0x0E60, 0x0E0E, 0x0E0F, 0x0E63}, + {0xF70F, 0x0E0E, 0x0E0F, 0xF700}, + {0x0E0D, 0x0E0E, 0x0E0F, 0x0E10}, + {0x0E0D, 0x0E0E, 0x0E0F, 0x0E10} + + }; + + if (cod >= CH_YO_YING && cod <= CH_THO_THAN) { + return noDescenderCODs[glyphSet][cod - CH_YO_YING]; + } + + return cod; +} + +le_uint8 ThaiShaping::doTransition (StateTransition transition, LEUnicode currChar, le_int32 inputIndex, le_uint8 glyphSet, + LEUnicode errorChar, LEUnicode *outputBuffer, LEGlyphStorage &glyphStorage, le_int32 &outputIndex) +{ + LEErrorCode success = LE_NO_ERROR; + + switch (transition.action) { + case tA: + glyphStorage.setCharIndex(outputIndex, inputIndex, success); + outputBuffer[outputIndex++] = currChar; + break; + + case tC: + glyphStorage.setCharIndex(outputIndex, inputIndex, success); + outputBuffer[outputIndex++] = currChar; + break; + + case tD: + glyphStorage.setCharIndex(outputIndex, inputIndex, success); + outputBuffer[outputIndex++] = leftAboveVowel(currChar, glyphSet); + break; + + case tE: + glyphStorage.setCharIndex(outputIndex, inputIndex, success); + outputBuffer[outputIndex++] = lowerRightTone(currChar, glyphSet); + break; + + case tF: + glyphStorage.setCharIndex(outputIndex, inputIndex, success); + outputBuffer[outputIndex++] = lowerLeftTone(currChar, glyphSet); + break; + + case tG: + glyphStorage.setCharIndex(outputIndex, inputIndex, success); + outputBuffer[outputIndex++] = upperLeftTone(currChar, glyphSet); + break; + + case tH: + { + LEUnicode cod = outputBuffer[outputIndex - 1]; + LEUnicode coa = noDescenderCOD(cod, glyphSet); + + if (cod != coa) { + outputBuffer[outputIndex - 1] = coa; + + glyphStorage.setCharIndex(outputIndex, inputIndex, success); + outputBuffer[outputIndex++] = currChar; + break; + } + + glyphStorage.setCharIndex(outputIndex, inputIndex, success); + outputBuffer[outputIndex++] = lowerBelowVowel(currChar, glyphSet); + break; + } + + case tR: + glyphStorage.setCharIndex(outputIndex, inputIndex, success); + outputBuffer[outputIndex++] = errorChar; + + glyphStorage.setCharIndex(outputIndex, inputIndex, success); + outputBuffer[outputIndex++] = currChar; + break; + + case tS: + if (currChar == CH_SARA_AM) { + glyphStorage.setCharIndex(outputIndex, inputIndex, success); + outputBuffer[outputIndex++] = errorChar; + } + + glyphStorage.setCharIndex(outputIndex, inputIndex, success); + outputBuffer[outputIndex++] = currChar; + break; + + default: + // FIXME: if we get here, there's an error + // in the state table! + glyphStorage.setCharIndex(outputIndex, inputIndex, success); + outputBuffer[outputIndex++] = currChar; + break; + } + + return transition.nextState; +} + +le_uint8 ThaiShaping::getNextState(LEUnicode ch, le_uint8 prevState, le_int32 inputIndex, le_uint8 glyphSet, LEUnicode errorChar, + le_uint8 &charClass, LEUnicode *output, LEGlyphStorage &glyphStorage, le_int32 &outputIndex) +{ + StateTransition transition; + + charClass = getCharClass(ch); + transition = getTransition(prevState, charClass); + + return doTransition(transition, ch, inputIndex, glyphSet, errorChar, output, glyphStorage, outputIndex); +} + +le_bool ThaiShaping::isLegalHere(LEUnicode ch, le_uint8 prevState) +{ + le_uint8 charClass = getCharClass(ch); + StateTransition transition = getTransition(prevState, charClass); + + switch (transition.action) { + case tA: + case tC: + case tD: + case tE: + case tF: + case tG: + case tH: + return TRUE; + + case tR: + case tS: + return FALSE; + + default: + // FIXME: if we get here, there's an error + // in the state table! + return FALSE; + } +} + +le_int32 ThaiShaping::compose(const LEUnicode *input, le_int32 offset, le_int32 charCount, le_uint8 glyphSet, + LEUnicode errorChar, LEUnicode *output, LEGlyphStorage &glyphStorage) +{ + le_uint8 state = 0; + le_int32 inputIndex; + le_int32 outputIndex = 0; + le_uint8 conState = 0xFF; + le_int32 conInput = -1; + le_int32 conOutput = -1; + + for (inputIndex = 0; inputIndex < charCount; inputIndex += 1) { + LEUnicode ch = input[inputIndex + offset]; + le_uint8 charClass; + + // Decompose SARA AM into NIKHAHIT + SARA AA + if (ch == CH_SARA_AM && isLegalHere(ch, state)) { + outputIndex = conOutput; + state = getNextState(CH_NIKHAHIT, conState, inputIndex, glyphSet, errorChar, charClass, + output, glyphStorage, outputIndex); + + for (int j = conInput + 1; j < inputIndex; j += 1) { + ch = input[j + offset]; + state = getNextState(ch, state, j, glyphSet, errorChar, charClass, + output, glyphStorage, outputIndex); + } + + ch = CH_SARA_AA; + } + + state = getNextState(ch, state, inputIndex, glyphSet, errorChar, charClass, + output, glyphStorage, outputIndex); + + if (charClass >= CON && charClass <= COD) { + conState = state; + conInput = inputIndex; + conOutput = outputIndex; + } + } + + return outputIndex; +} + +U_NAMESPACE_END |