355 lines
9.9 KiB
C++
355 lines
9.9 KiB
C++
/*
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* @(#)ThaiShaping.cpp 1.13 00/03/15
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*
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* (C) Copyright IBM Corp. 1998, 1999, 2000 - All Rights Reserved
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*
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*/
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#include "LETypes.h"
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#include "LEGlyphFilter.h"
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#include "OpenTypeTables.h"
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#include "ThaiShaping.h"
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enum {
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CH_SPACE = 0x0020,
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CH_YAMAKKAN = 0x0E4E,
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CH_MAI_HANAKAT = 0x0E31,
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CH_SARA_AA = 0x0E32,
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CH_SARA_AM = 0x0E33,
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CH_SARA_UEE = 0x0E37,
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CH_MAITAIKHU = 0x0E47,
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CH_NIKHAHIT = 0x0E4D,
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CH_SARA_U = 0x0E38,
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CH_PHINTHU = 0x0E3A,
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CH_YO_YING = 0x0E0D,
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CH_THO_THAN = 0x0E10,
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CH_DOTTED_CIRCLE = 0x25CC
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};
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le_uint8 ThaiShaping::getCharClass(LEUnicode ch)
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{
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le_uint8 charClass = NON;
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if (ch >= 0x0E00 && ch <= 0x0E5B) {
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charClass = classTable[ch - 0x0E00];
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}
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return charClass;
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}
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LEUnicode ThaiShaping::leftAboveVowel(LEUnicode vowel, le_uint8 glyphSet)
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{
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static LEUnicode leftAboveVowels[][7] = {
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{0x0E61, 0x0E32, 0x0E33, 0x0E64, 0x0E65, 0x0E66, 0x0E67},
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{0xF710, 0x0E32, 0x0E33, 0xF701, 0xF702, 0xF703, 0xF704},
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{0xF884, 0x0E32, 0x0E33, 0xF885, 0xF886, 0xF887, 0xF788},
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{0x0E31, 0x0E32, 0x0E33, 0x0E34, 0x0E35, 0x0E36, 0x0E37}
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};
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if (vowel >= CH_MAI_HANAKAT && vowel <= CH_SARA_UEE) {
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return leftAboveVowels[glyphSet][vowel - CH_MAI_HANAKAT];
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}
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if (vowel == CH_YAMAKKAN && glyphSet == 0) {
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return 0x0E7E;
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}
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return vowel;
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}
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LEUnicode ThaiShaping::lowerRightTone(LEUnicode tone, le_uint8 glyphSet)
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{
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static LEUnicode lowerRightTones[][7] = {
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{0x0E68, 0x0E69, 0x0E6A, 0x0E6B, 0x0E6C, 0x0E6D, 0x0E6E},
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{0x0E47, 0xF70A, 0xF70B, 0xF70C, 0xF70D, 0xF70E, 0x0E4D},
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{0x0E47, 0xF88B, 0xF88E, 0xF891, 0xF894, 0xF897, 0x0E4D},
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{0x0E47, 0x0E48, 0x0E49, 0x0E4A, 0x0E4B, 0x0E4C, 0x0E4D}
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};
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if (tone >= CH_MAITAIKHU && tone <= CH_NIKHAHIT) {
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return lowerRightTones[glyphSet][tone - CH_MAITAIKHU];
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}
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return tone;
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}
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LEUnicode ThaiShaping::lowerLeftTone(LEUnicode tone, le_uint8 glyphSet)
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{
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static LEUnicode lowerLeftTones[][7] = {
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{0x0E76, 0x0E77, 0x0E78, 0x0E79, 0x0E7A, 0x0E7B, 0x0E7C},
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{0xF712, 0xF705, 0xF706, 0xF707, 0xF708, 0xF709, 0xF711},
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{0xF889, 0xF88C, 0xF88F, 0xF892, 0xF895, 0xF898, 0xF899},
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{0x0E47, 0x0E48, 0x0E49, 0x0E4A, 0x0E4B, 0x0E4C, 0x0E4D}
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};
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if (tone >= CH_MAITAIKHU && tone <= CH_NIKHAHIT) {
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return lowerLeftTones[glyphSet][tone - CH_MAITAIKHU];
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}
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return tone;
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}
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LEUnicode ThaiShaping::upperLeftTone(LEUnicode tone, le_uint8 glyphSet)
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{
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static LEUnicode upperLeftTones[][7] = {
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{0x0E6F, 0x0E70, 0x0E71, 0x0E72, 0x0E73, 0x0E74, 0x0E75},
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{0xF712, 0xF713, 0xF714, 0xF715, 0xF716, 0xF717, 0xF711},
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{0xF889, 0xF88A, 0xF88D, 0xF890, 0xF893, 0xF896, 0xF899},
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{0x0E47, 0x0E48, 0x0E49, 0x0E4A, 0x0E4B, 0x0E4C, 0x0E4D}
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};
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if (tone >= CH_MAITAIKHU && tone <= CH_NIKHAHIT) {
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return upperLeftTones[glyphSet][tone - CH_MAITAIKHU];
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}
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return tone;
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}
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LEUnicode ThaiShaping::lowerBelowVowel(LEUnicode vowel, le_uint8 glyphSet)
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{
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static LEUnicode lowerBelowVowels[][3] = {
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{0x0E3C, 0x0E3D, 0x0E3E},
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{0xF718, 0xF719, 0xF71A},
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{0x0E38, 0x0E39, 0x0E3A},
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{0x0E38, 0x0E39, 0x0E3A}
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};
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if (vowel >= CH_SARA_U && vowel <= CH_PHINTHU) {
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return lowerBelowVowels[glyphSet][vowel - CH_SARA_U];
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}
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return vowel;
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}
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LEUnicode ThaiShaping::noDescenderCOD(LEUnicode cod, le_uint8 glyphSet)
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{
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static LEUnicode noDescenderCODs[][4] = {
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{0x0E60, 0x0E0E, 0x0E0F, 0x0E63},
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{0xF70F, 0x0E0E, 0x0E0F, 0xF700},
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{0x0E0D, 0x0E0E, 0x0E0F, 0x0E10},
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{0x0E0D, 0x0E0E, 0x0E0F, 0x0E10}
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};
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if (cod >= CH_YO_YING && cod <= CH_THO_THAN) {
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return noDescenderCODs[glyphSet][cod - CH_YO_YING];
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}
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return cod;
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}
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le_uint8 ThaiShaping::doTransition (StateTransition transition, LEUnicode currChar, le_int32 inputIndex, le_uint8 glyphSet,
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LEUnicode errorChar, LEUnicode *outputBuffer, le_int32 *charIndicies, le_int32 &outputIndex)
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{
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switch (transition.action) {
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case _A:
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charIndicies[outputIndex] = inputIndex;
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outputBuffer[outputIndex++] = currChar;
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break;
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case _C:
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charIndicies[outputIndex] = inputIndex;
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outputBuffer[outputIndex++] = currChar;
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break;
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case _D:
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charIndicies[outputIndex] = inputIndex;
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outputBuffer[outputIndex++] = leftAboveVowel(currChar, glyphSet);
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break;
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case _E:
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charIndicies[outputIndex] = inputIndex;
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outputBuffer[outputIndex++] = lowerRightTone(currChar, glyphSet);
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break;
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case _F:
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charIndicies[outputIndex] = inputIndex;
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outputBuffer[outputIndex++] = lowerLeftTone(currChar, glyphSet);
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break;
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case _G:
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charIndicies[outputIndex] = inputIndex;
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outputBuffer[outputIndex++] = upperLeftTone(currChar, glyphSet);
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break;
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case _H:
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{
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LEUnicode cod = outputBuffer[outputIndex - 1];
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LEUnicode coa = noDescenderCOD(cod, glyphSet);
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if (cod != coa) {
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outputBuffer[outputIndex - 1] = coa;
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charIndicies[outputIndex] = inputIndex;
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outputBuffer[outputIndex++] = currChar;
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break;
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}
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charIndicies[outputIndex] = inputIndex;
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outputBuffer[outputIndex++] = lowerBelowVowel(currChar, glyphSet);
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break;
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}
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case _R:
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charIndicies[outputIndex] = inputIndex;
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outputBuffer[outputIndex++] = errorChar;
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charIndicies[outputIndex] = inputIndex;
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outputBuffer[outputIndex++] = currChar;
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break;
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case _S:
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if (currChar == CH_SARA_AM) {
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charIndicies[outputIndex] = inputIndex;
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outputBuffer[outputIndex++] = errorChar;
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}
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charIndicies[outputIndex] = inputIndex;
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outputBuffer[outputIndex++] = currChar;
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break;
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default:
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// FIXME: if we get here, there's an error
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// in the state table!
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charIndicies[outputIndex] = inputIndex;
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outputBuffer[outputIndex++] = currChar;
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break;
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}
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return transition.nextState;
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}
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le_uint8 ThaiShaping::getNextState(LEUnicode ch, le_uint8 prevState, le_int32 inputIndex, le_uint8 glyphSet, LEUnicode errorChar,
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le_uint8 &charClass, LEUnicode *output, le_int32 *charIndicies, le_int32 &outputIndex)
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{
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StateTransition transition;
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charClass = getCharClass(ch);
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transition = getTransition(prevState, charClass);
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return doTransition(transition, ch, inputIndex, glyphSet, errorChar, output, charIndicies, outputIndex);
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}
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le_bool ThaiShaping::isLegalHere(LEUnicode ch, le_uint8 prevState)
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{
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le_uint8 charClass = getCharClass(ch);
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StateTransition transition = getTransition(prevState, charClass);
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switch (transition.action) {
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case _A:
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case _C:
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case _D:
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case _E:
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case _F:
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case _G:
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case _H:
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return true;
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case _R:
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case _S:
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return false;
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default:
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// FIXME: if we get here, there's an error
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// in the state table!
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return false;
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}
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}
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le_int32 ThaiShaping::compose(const LEUnicode *input, le_int32 offset, le_int32 charCount, le_uint8 glyphSet,
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LEUnicode errorChar, LEUnicode *output, le_int32 *charIndicies)
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{
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le_uint8 state = 0;
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le_int32 inputIndex;
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le_int32 outputIndex = 0;
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le_uint8 conState = -1;
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le_int32 conInput = -1;
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le_int32 conOutput = -1;
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for (inputIndex = 0; inputIndex < charCount; inputIndex += 1) {
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LEUnicode ch = input[inputIndex + offset];
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le_uint8 charClass;
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// Decompose SARA AM into NIKHAHIT + SARA AA
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if (ch == CH_SARA_AM && isLegalHere(ch, state)) {
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outputIndex = conOutput;
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state = getNextState(CH_NIKHAHIT, conState, inputIndex, glyphSet, errorChar, charClass,
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output, charIndicies, outputIndex);
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for (int j = conInput + 1; j < inputIndex; j += 1) {
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ch = input[j + offset];
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state = getNextState(ch, state, j, glyphSet, errorChar, charClass,
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output, charIndicies, outputIndex);
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}
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ch = CH_SARA_AA;
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}
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state = getNextState(ch, state, inputIndex, glyphSet, errorChar, charClass,
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output, charIndicies, outputIndex);
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if (charClass >= CON && charClass <= COD) {
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conState = state;
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conInput = inputIndex;
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conOutput = outputIndex;
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}
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}
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return outputIndex;
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}
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ThaiMarkFilter::ThaiMarkFilter(le_uint8 glyphSet)
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: rangeList(NULL)
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{
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static MarkRange glyphSet0MarkRanges[] =
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{
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{0x0E31, 0x0E31}, {0x0E34, 0x0E3A}, {0x0E47, 0x0E4E}, {0x0E61, 0x0E61}, {0x0E64, 0x0E7C}, {0xFFFF, 0xFFFF}
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};
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static MarkRange glyphSet1MarkRanges[] =
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{
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{0x0E31, 0x0E31}, {0x0E34, 0x0E3A}, {0x0E47, 0x0E4E}, {0xF701, 0xF70E}, {0xF710, 0xF71A}, {0xFFFF, 0xFFFF}
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};
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static MarkRange glyphSet2MarkRanges[] =
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{
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{0x0E31, 0x0E31}, {0x0E34, 0x0E3A}, {0x0E47, 0x0E4E}, {0xF884, 0xF899}, {0xFFFF, 0xFFFF}
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};
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static MarkRange glyphSet3MarkRanges[] =
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{
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{0x0E31, 0x0E31}, {0x0E34, 0x0E3A}, {0x0E47, 0x0E4E}, {0xFFFF, 0xFFFF}
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};
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static MarkRange *rangeTable[] =
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{glyphSet0MarkRanges, glyphSet1MarkRanges, glyphSet2MarkRanges, glyphSet3MarkRanges};
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if (glyphSet <= 3) {
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rangeList = rangeTable[glyphSet];
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}
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}
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ThaiMarkFilter::~ThaiMarkFilter()
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{
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// nothing to do here...
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}
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le_bool ThaiMarkFilter::filter(LEGlyphID glyph)
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{
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le_int32 i;
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if (rangeList != NULL) {
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for (i = 0; rangeList[i].first <= glyph; i += 1) {
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if (rangeList[i].last >= glyph) {
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return true;
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}
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}
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}
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return false;
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}
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