--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/fontservices/textshaperplugin/IcuSource/layout/ThaiShaping.cpp Tue Feb 02 02:02:46 2010 +0200
@@ -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