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Diffstat (limited to 'modules/indic/indic-ot.c')
| -rw-r--r-- | modules/indic/indic-ot.c | 521 |
1 files changed, 0 insertions, 521 deletions
diff --git a/modules/indic/indic-ot.c b/modules/indic/indic-ot.c deleted file mode 100644 index 7a72d34b..00000000 --- a/modules/indic/indic-ot.c +++ /dev/null @@ -1,521 +0,0 @@ -/* Pango - * indic-ot.c: - * - * Copyright (C) 2001, 2002 IBM Corporation. All Rights Reserved. - * Author: Eric Mader <mader@jtcsv.com> - * - * Permission is hereby granted, free of charge, to any person - * obtaining a copy of this software and associated documentation - * files (the "Software"), to deal in the Software without - * restriction, including without limitation the rights to use, copy, - * modify, merge, publish, distribute, and/or sell copies of the - * Software, and to permit persons to whom the Software is furnished - * to do so, provided that the above copyright notice(s) and this - * permission notice appear in all copies of the Software and that - * both the above copyright notice(s) and this permission notice - * appear in supporting documentation. - * - * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, - * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF - * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND - * NONINFRINGEMENT OF THIRD PARTY RIGHTS. IN NO EVENT SHALL THE - * COPYRIGHT HOLDER OR HOLDERS INCLUDED IN THIS NOTICE BE LIABLE FOR - * ANY CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY - * DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, - * WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS - * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE - * OF THIS SOFTWARE. - * - * Except as contained in this notice, the name of a copyright holder - * shall not be used in advertising or otherwise to promote the sale, - * use or other dealings in this Software without prior written - * authorization of the copyright holder. - */ - -#include "config.h" - -#include "indic-ot.h" -#include "mprefixups.h" -/* - * FIXME: should the IndicOutput stuff be moved - * to a separate .h and .c file just to keep the - * clutter down here? (it's not really usefull - * anyplace else, is it?) - */ -struct _Output -{ - glong fOutIndex; - - const glong *fOriginalOffsets; - - gunichar *fOutChars; - glong *fCharIndices; - gulong *fCharTags; - - gunichar fMpre; - gunichar fMbelow; - gunichar fMabove; - gunichar fMpost; - gunichar fLengthMark; - gunichar fAlLakuna; /* to handle Al-Lakuna in sinhala split matras */ - glong fMatraIndex; - gulong fMatraTags; - gboolean fMatraWordStart; - glong fMPreOutIndex; - - MPreFixups *fMPreFixups; -}; - -typedef struct _Output Output; - -static void initOutput(Output *output, const glong *originalOffsets, gunichar *outChars, glong *charIndices, gulong *charTags, MPreFixups *mpreFixups) -{ - output->fOriginalOffsets = originalOffsets; - - output->fOutChars = outChars; - output->fCharIndices = charIndices; - output->fCharTags = charTags; - - output->fOutIndex = 0; - output->fMatraTags = 0; - - output->fMpre = output->fMbelow = output->fMabove = output->fMpost = output->fLengthMark = output->fAlLakuna = 0; - - output->fMPreOutIndex = -1; - output->fMPreFixups = mpreFixups; -} - -static void saveMatra(Output *output, gunichar matra, IndicOTCharClass matraClass) -{ - /* FIXME: check if already set, or if not a matra... */ - if (IS_M_PRE(matraClass)) { - output->fMpre = matra; - } else if (IS_M_BELOW(matraClass)) { - output->fMbelow = matra; - } else if (IS_M_ABOVE(matraClass)) { - output->fMabove = matra; - } else if (IS_M_POST(matraClass)) { - output->fMpost = matra; - } else if (IS_LENGTH_MARK(matraClass)) { - output->fLengthMark = matra; - } else if (IS_AL_LAKUNA(matraClass)) { - output->fAlLakuna = matra; - } -} - -static void initMatra(Output *output, guint32 matraIndex, gulong matraTags, gboolean wordStart) -{ - output->fMpre = output->fMbelow = output->fMabove = output->fMpost = output->fLengthMark = output->fAlLakuna = 0; - output->fMPreOutIndex = -1; - output->fMatraIndex = matraIndex; - output->fMatraTags = matraTags; - output->fMatraWordStart = wordStart; -} - -static gboolean noteMatra(Output *output, const IndicOTClassTable *classTable, gunichar matra) -{ - IndicOTCharClass matraClass = indic_ot_get_char_class(classTable, matra); - - if (IS_MATRA(matraClass)) { - if (IS_SPLIT_MATRA(matraClass)) { - const IndicOTSplitMatra *splitMatra = indic_ot_get_split_matra(classTable, matraClass); - int i; - - for (i = 0; i < 3 && (*splitMatra)[i] != 0; i += 1) { - gunichar piece = (*splitMatra)[i]; - IndicOTCharClass pieceClass = indic_ot_get_char_class(classTable, piece); - - saveMatra(output, piece, pieceClass); - } - } else { - saveMatra(output, matra, matraClass); - } - - return TRUE; - } else - return FALSE; -} - -static void noteBaseConsonant(Output *output) -{ - if (output->fMPreFixups && output->fMPreOutIndex >= 0) { - indic_mprefixups_add(output->fMPreFixups, output->fOutIndex, output->fMPreOutIndex); - } -} - -static void writeChar(Output *output, gunichar ch, guint32 charIndex, gulong charTags) -{ - if (output->fOutChars != NULL) { - output->fOutChars[output->fOutIndex] = ch; - output->fCharIndices[output->fOutIndex] = output->fOriginalOffsets[charIndex]; - output->fCharTags[output->fOutIndex] = charTags; - } - - output->fOutIndex += 1; -} - -static void writeMpre(Output *output) -{ - if (output->fMpre != 0) { - gulong tags = output->fMatraTags; - if (output->fMatraWordStart) - tags &= ~init; - - output->fMPreOutIndex = output->fOutIndex; - writeChar(output, output->fMpre, output->fMatraIndex, tags); - } -} - -static void writeMbelow(Output *output) -{ - if (output->fMbelow != 0) { - writeChar(output, output->fMbelow, output->fMatraIndex, output->fMatraTags); - } -} - -static void writeMabove(Output *output) -{ - if (output->fMabove != 0) { - writeChar(output, output->fMabove, output->fMatraIndex, output->fMatraTags); - } -} - -static void writeMpost(Output *output) -{ - if (output->fMpost != 0) { - writeChar(output, output->fMpost, output->fMatraIndex, output->fMatraTags); - } -} - -static void writeLengthMark(Output *output) -{ - if (output->fLengthMark != 0) { - writeChar(output, output->fLengthMark, output->fMatraIndex, output->fMatraTags); - } -} - -static void writeAlLakuna(Output *output) -{ - if (output->fAlLakuna != 0) { - writeChar(output, output->fAlLakuna, output->fMatraIndex, output->fMatraTags); - } -} - -static glong getOutputIndex(Output *output) -{ - return output->fOutIndex; -} - -#define false 0 -#define true 1 - -glong indic_ot_reorder(const gunichar *chars, const glong *utf8_offsets, glong char_count, const IndicOTClassTable *class_table, gunichar *out_chars, glong *char_indices, gulong *char_tags, MPreFixups **outMPreFixups) -{ - MPreFixups *mpreFixups = NULL; - Output output; - glong i, prev = 0; - gboolean last_in_word = FALSE; - - if (outMPreFixups && (class_table->scriptFlags & SF_MPRE_FIXUP)) { - mpreFixups = indic_mprefixups_new (char_count); - } - - initOutput(&output, utf8_offsets, out_chars, char_indices, char_tags, mpreFixups); - - while (prev < char_count) { - glong syllable = indic_ot_find_syllable(class_table, chars, prev, char_count); - glong matra, vmabove, vmpost = syllable; - - while (vmpost > prev && indic_ot_is_vm_post(class_table, chars[vmpost - 1])) { - vmpost -= 1; - } - - vmabove = vmpost; - while (vmabove > prev && indic_ot_is_vm_above(class_table, chars[vmabove - 1])) { - vmabove -= 1; - } - - matra = vmabove - 1; - initMatra(&output, prev, blwf_p, !last_in_word); - while (noteMatra(&output, class_table, chars[matra]) && - matra != prev) - matra--; - - last_in_word = TRUE; - switch (indic_ot_get_char_class(class_table, chars[prev]) & CF_CLASS_MASK) { - case CC_RESERVED: - last_in_word = FALSE; - /* Fall through */ - case CC_INDEPENDENT_VOWEL: - case CC_ZERO_WIDTH_MARK: - for (i = prev; i < syllable; i += 1) { - writeChar(&output, chars[i], /*i*/ prev, blwf_p); - } - - break; - - case CC_MODIFYING_MARK_ABOVE: - case CC_MODIFYING_MARK_POST: - case CC_NUKTA: - case CC_VIRAMA: - /* patch for rendering fix for Malayalam SAMVRUTHOKARA by suresh */ - if (chars[prev - 1] == 0x0D41) { - writeChar(&output, chars[prev], prev, blwf_p); - break; - } - /* end patch */ - - case CC_AL_LAKUNA: - writeChar(&output, C_DOTTED_CIRCLE, prev, blwf_p); - writeChar(&output, chars[prev], prev, blwf_p); - break; - - case CC_DEPENDENT_VOWEL: - writeMpre(&output); - writeChar(&output, C_DOTTED_CIRCLE, prev, blwf_p); - writeMbelow(&output); - writeMabove(&output); - writeMpost(&output); - writeLengthMark(&output); - writeAlLakuna(&output); - break; - - case CC_CONSONANT: - case CC_CONSONANT_WITH_NUKTA: - { - guint32 length = vmabove - prev; - glong lastConsonant = vmabove - 1; - glong baseLimit = prev; - glong baseConsonant, postBase, postBaseLimit; - gboolean seenVattu, seenBelowBaseForm, supressVattu; - glong bcSpan; - - /* Check for REPH at front of syllable */ - if (length > 2 && indic_ot_is_reph(class_table, chars[prev]) && indic_ot_is_virama(class_table, chars[prev + 1])) { - baseLimit += 2; - - /* Check for eyelash RA, if the script supports it */ - if ((class_table->scriptFlags & SF_EYELASH_RA) != 0 && - chars[baseLimit] == C_SIGN_ZWJ) { - if (length > 3) { - baseLimit += 1; - } else { - baseLimit -= 2; - } - } - } - - while (lastConsonant > baseLimit && !indic_ot_is_consonant(class_table, chars[lastConsonant])) { - lastConsonant -= 1; - } - - baseConsonant = lastConsonant; - postBase = lastConsonant + 1; - - postBaseLimit = class_table->scriptFlags & SF_POST_BASE_LIMIT_MASK; - seenVattu = false; - seenBelowBaseForm = false; - supressVattu = true; - - while (baseConsonant > baseLimit) { - IndicOTCharClass charClass = indic_ot_get_char_class(class_table, chars[baseConsonant]); - - if (IS_CONSONANT(charClass)) { - if (postBaseLimit == 0 || seenVattu || - (baseConsonant > baseLimit && !indic_ot_is_virama(class_table, chars[baseConsonant - 1])) || - !HAS_POST_OR_BELOW_BASE_FORM(charClass)) { - break; - } - - seenVattu = IS_VATTU(charClass); - - if (HAS_POST_BASE_FORM(charClass)) { - if (seenBelowBaseForm) { - break; - } - - postBase = baseConsonant; - } else if (HAS_BELOW_BASE_FORM(charClass)) { - seenBelowBaseForm = true; - } - - postBaseLimit -= 1; - } - - baseConsonant -= 1; - } - - /* Write Mpre */ - writeMpre(&output); - - /* Write eyelash RA */ - /* NOTE: baseLimit == prev + 3 iff eyelash RA present... */ - if (baseLimit == prev + 3) { - writeChar(&output, chars[prev], prev, half_p); - writeChar(&output, chars[prev + 1], prev /*+ 1*/, half_p); - writeChar(&output, chars[prev + 2], prev /*+ 2*/, half_p); - } - - /* write any pre-base consonants */ - supressVattu = true; - - for (i = baseLimit; i < baseConsonant; i += 1) { - gunichar ch = chars[i]; - /* Applying blwf to the first consonant doesn't makes sense - * since the below-form follows the consonant that it is - * put under */ - gulong tag = (i == baseLimit) ? half_p : blwf_p; - IndicOTCharClass charClass = indic_ot_get_char_class(class_table, ch); - - if (IS_CONSONANT(charClass)) { - if (IS_VATTU(charClass) && supressVattu) { - tag = nukt_p; - } - else if ((i + 2 < baseConsonant) && (chars[i + 2] == C_SIGN_ZWNJ)) { - tag = nukt_p; - } - - supressVattu = IS_VATTU(charClass); - } else if (IS_VIRAMA(charClass) && chars[i + 1] == C_SIGN_ZWNJ) - { - tag = nukt_p; - } - - writeChar(&output, ch, /*i*/ prev, tag); - } - - bcSpan = baseConsonant + 1; - - if (bcSpan < vmabove && indic_ot_is_nukta(class_table, chars[bcSpan])) { - bcSpan += 1; - } - - if (baseConsonant == lastConsonant && bcSpan < vmabove && indic_ot_is_virama(class_table, chars[bcSpan])) { - bcSpan += 1; - - if (bcSpan < vmabove && chars[bcSpan] == C_SIGN_ZWNJ) { - bcSpan += 1; - } - } - - /* note the base consonant for post-GSUB fixups */ - noteBaseConsonant(&output); - - /* write base consonant */ - for (i = baseConsonant; i < bcSpan; i += 1) { - writeChar(&output, chars[i], /*i*/ prev, nukt_p); - } - - if ((class_table->scriptFlags & SF_MATRAS_AFTER_BASE) != 0) { - gboolean is_for_0C48 = FALSE; - if (output.fOutChars != NULL) { /*for 0x0C48 of Telugu*/ - int t; - for (t = prev; t < syllable; t++) { - if (chars[t] == 0x0C48) { - writeMabove(&output); - writeMbelow(&output); - writeMpost(&output); - - is_for_0C48 = TRUE; - break; - } - } - } - - if (!is_for_0C48) { - writeMbelow(&output); - writeMabove(&output); - writeMpost(&output); - } - } - - /* write below-base consonants */ - if (baseConsonant != lastConsonant) { - for (i = bcSpan + 1; i < postBase; i += 1) { - writeChar(&output, chars[i], /*i*/ prev, blwf_p); - } - - if (postBase > lastConsonant) { - /* write halant that was after base consonant */ - writeChar(&output, chars[bcSpan], /*bcSpan*/ prev, blwf_p); - } - } - - /* write Mbelow, Mabove */ - if ((class_table->scriptFlags & SF_MATRAS_AFTER_BASE) == 0) { - writeMbelow(&output); - writeMabove(&output); - } - - if ((class_table->scriptFlags & SF_REPH_AFTER_BELOW) != 0) { - if (baseLimit == prev + 2) { - writeChar(&output, chars[prev], prev, rphf_p); - writeChar(&output, chars[prev + 1], prev /*+ 1*/, rphf_p); - } - - /* write VMabove */ - for (i = vmabove; i < vmpost; i += 1) { - writeChar(&output, chars[i], /*i*/ prev, blwf_p); - } - } - - /* write post-base consonants */ - if (baseConsonant != lastConsonant) { - if (postBase <= lastConsonant) { - for (i = postBase; i <= lastConsonant; i += 1) { - writeChar(&output, chars[i], /*i*/ prev, pstf_p); - } - - /* write halant that was after base consonant */ - writeChar(&output, chars[bcSpan], /*bcSpan*/ prev, blwf_p); - } - - /* write the training halant, if there is one */ - if (lastConsonant < matra && indic_ot_is_virama(class_table, chars[matra])) { - writeChar(&output, chars[matra], /*matra*/ prev, nukt_p); - } - } - - /* write Mpost */ - if ((class_table->scriptFlags & SF_MATRAS_AFTER_BASE) == 0) { - writeMpost(&output); - } - - writeLengthMark(&output); - writeAlLakuna(&output); - - /* write reph */ - if ((class_table->scriptFlags & SF_REPH_AFTER_BELOW) == 0) { - if (baseLimit == prev + 2) { - writeChar(&output, chars[prev], prev, rphf_p); - writeChar(&output, chars[prev + 1], prev /*+ 1*/, rphf_p); - } - - /* write VMabove */ - for (i = vmabove; i < vmpost; i += 1) { - writeChar(&output, chars[i], /*i*/ prev, blwf_p); - } - } - - /* write VMpost */ - for (i = vmpost; i < syllable; i += 1) { - writeChar(&output, chars[i], /*i*/ prev, blwf_p); - } - - break; - } - - default: - break; - } - - - prev = syllable; - } - - if (outMPreFixups) { - *outMPreFixups = mpreFixups; - } - - return getOutputIndex(&output); -} |