diff options
Diffstat (limited to 'src/thrend')
| -rw-r--r-- | src/thrend/Makefile.am | 8 | ||||
| -rw-r--r-- | src/thrend/Makefile.in | 506 | ||||
| -rw-r--r-- | src/thrend/thrend.c | 345 |
3 files changed, 859 insertions, 0 deletions
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tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ +/* + * libthai - Thai Language Support Library + * Copyright (C) 2001 Theppitak Karoonboonyanan <thep@linux.thai.net> + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +/* + * thrend.h - Thai string rendering + * Created: 2001-08-06 + * Author: Theppitak Karoonboonyanan <thep@linux.thai.net> + */ + +#include <string.h> +#include <thai/thrend.h> +#include <thai/thctype.h> +#include <thai/tis.h> + + +typedef struct { + thglyph_t ShiftDown_TONE_AD[8]; + thglyph_t ShiftDownLeft_TONE_AD[8]; + thglyph_t ShiftLeft_TONE_AD[8]; + thglyph_t ShiftLeft_AV[7]; + thglyph_t ShiftDown_BV_BD[3]; + thglyph_t TailCutCons[4]; +} ThaiShapeTable; + +#define shiftdown_tone_ad(c,tbl) ((tbl)->ShiftDown_TONE_AD[(c)-TIS_MAITAIKHU]) +#define shiftdownleft_tone_ad(c,tbl) ((tbl)->ShiftDownLeft_TONE_AD[(c)-TIS_MAITAIKHU]) +#define shiftleft_tone_ad(c,tbl) ((tbl)->ShiftLeft_TONE_AD[(c)-TIS_MAITAIKHU]) +#define shiftleft_av(c,tbl) ((tbl)->ShiftLeft_AV[(c)-TIS_MAI_HAN_AKAT]) +#define shiftdown_bv_bd(c,tbl) ((tbl)->ShiftDown_BV_BD[(c)-TIS_SARA_U]) +#define tailcutcons(c,tbl) ((tbl)->TailCutCons[(c)-TIS_YO_YING]) + +/* + * No adjusted vowel/tonemark glyphs (tis620-0) + */ +static const ThaiShapeTable tis620_0_shape_table_ = { + { 0xE7, 0xE8, 0xE9, 0xEA, 0xEB, 0xEC, 0xED, 0xEE }, + { 0xE7, 0xE8, 0xE9, 0xEA, 0xEB, 0xEC, 0xED, 0xEE }, + { 0xE7, 0xE8, 0xE9, 0xEA, 0xEB, 0xEC, 0xED, 0xEE }, + { 0xD1, 0x00, 0x00, 0xD4, 0xD5, 0xD6, 0xD7 }, + { 0xD8, 0xD9, 0xDA }, + { 0xAD, 0x00, 0x00, 0xB0 } +}; + +/* + * Macintosh + */ +static const ThaiShapeTable Mac_shape_table_ = { + { 0xE7, 0x88, 0x89, 0x8A, 0x8B, 0x8C, 0xED, 0xEE }, + { 0x93, 0x83, 0x84, 0x85, 0x86, 0x87, 0x8F, 0xEE }, + { 0x93, 0x98, 0x99, 0x9A, 0x9B, 0x9C, 0x8F, 0xEE }, + { 0x92, 0x00, 0x00, 0x94, 0x95, 0x96, 0x97 }, + { 0xFC, 0xFD, 0xFE }, + { 0x90, 0x00, 0x00, 0x80 } +}; + +/* + * Microsoft Window + */ +static const ThaiShapeTable Win_shape_table_ = { + { 0xE7, 0x8B, 0x8C, 0x8D, 0x8E, 0x8F, 0xED, 0xEE }, + { 0x9A, 0x86, 0x87, 0x88, 0x89, 0x8A, 0x99, 0xEE }, + { 0x9A, 0x9B, 0x9C, 0x9D, 0x9E, 0x9F, 0x99, 0xEE }, + { 0x98, 0x00, 0x00, 0x81, 0x82, 0x83, 0x84 }, + { 0xFC, 0xFD, 0xFE }, + { 0x90, 0x00, 0x00, 0x80 } +}; + +static int +th_render_cell_ (struct thcell_t cell, + thglyph_t res[], size_t res_sz, + int is_decomp_am, + const ThaiShapeTable *tbl) +{ + size_t left = res_sz; + + /* put base character */ + if (left > 0) { + thchar_t c = cell.base; + if (th_isundersplitcons (c) && th_chlevel (cell.hilo) < 0) { + c = tailcutcons (c, tbl); + } + *res++ = c ? c : TH_BLANK_BASE_GLYPH; + --left; + } + /* put hilo character */ + if (left > 0 && cell.hilo) { + thchar_t c = 0; + if (cell.hilo != TIS_SARA_AM) { + c = cell.hilo; + } else if (is_decomp_am) { + c = TIS_NIKHAHIT; + } + if (c) { + if (th_isovershootcons(cell.base) && th_chlevel(c) > 0) { + c = th_isupvowel(c) ? shiftleft_av (c, tbl) + : shiftleft_tone_ad (c, tbl); + } else if (th_isundershootcons (cell.base) && th_chlevel (c) < 0) { + c = shiftdown_bv_bd (c, tbl); + } + *res++ = c; + --left; + } + } + /* put top character */ + if (left > 0 && cell.top) { + thchar_t c = cell.top; + if (th_isupvowel (cell.hilo) + || (is_decomp_am && cell.hilo == TIS_SARA_AM)) + { + c = th_isovershootcons (cell.base) ? shiftleft_tone_ad (c, tbl) : c; + } else { + c = th_isovershootcons (cell.base) ? shiftdownleft_tone_ad (c, tbl) + : shiftdown_tone_ad (c, tbl); + } + *res++ = c; + --left; + } + /* put extra character */ + if (left > 0 && cell.hilo == TIS_SARA_AM) { + *res++ = is_decomp_am ? TIS_SARA_AA : TIS_SARA_AM; + --left; + } + + /* null terminate */ + if (left > 0) { + *res = 0; + } + + return res_sz - left; +} + +/** + * @brief Render the given cell using TIS-620 glyph set + * + * @param cell : the cell to render + * @param res : the buffer for storing output glyph string + * @param res_sz : the size of @a res buffer + * @param is_decomp_am : whether SARA AM is to be decomposed into + * NIKHANIT and SARA AA and to be in separate cells + * + * @return total number of glyphs written to @a res[] + * + * Calculates glyphs from TIS-620 glyph set for the given @a cell, + * and store the glyph string in @a res, terminated with '\\0'. + * If resulting glyphs are longer than the provided buffer, only + * the first @a res_sz glyphs are stored. + */ +int +th_render_cell_tis (struct thcell_t cell, + thglyph_t res[], size_t res_sz, + int is_decomp_am) +{ + size_t left = res_sz; + + if (left > 0) { + *res++ = cell.base ? cell.base : TH_BLANK_BASE_GLYPH; + --left; + } + if (left > 0 && cell.hilo) { + if (cell.hilo != TIS_SARA_AM) { + *res++ = cell.hilo; + --left; + } else if (is_decomp_am) { + *res++ = TIS_NIKHAHIT; + --left; + } + } + if (left > 0 && cell.top) { + *res++ = cell.top; + --left; + } + if (left > 0 && cell.hilo == TIS_SARA_AM) { + *res++ = (is_decomp_am) ? TIS_SARA_AA : TIS_SARA_AM; + --left; + } + if (left > 0) { + *res = 0; + } + + return res_sz - left; +} + +/** + * @brief Render the given cell using Thai Windows glyph set + * + * @param cell : the cell to render + * @param res : the buffer for storing output glyph string + * @param res_sz : the size of @a res buffer + * @param is_decomp_am : whether SARA AM is to be decomposed into + * NIKHANIT and SARA AA and to be in separate cells + * + * @return total number of glyphs written to @a res[] + * + * Calculates glyphs from Thai Windows glyph set for the given @a cell, + * and store the glyph string in @a res, terminated with '\\0'. + * If resulting glyphs are longer than the provided buffer, only + * the first @a res_sz glyphs are stored. + */ +int +th_render_cell_win (struct thcell_t cell, + thglyph_t res[], size_t res_sz, + int is_decomp_am) +{ + return th_render_cell_ (cell, res, res_sz, is_decomp_am, &Win_shape_table_); +} + +/** + * @brief Render the given cell using Mac Thai glyph set + * + * @param cell : the cell to render + * @param res : the buffer for storing output glyph string + * @param res_sz : the size of @a res buffer + * @param is_decomp_am : whether SARA AM is to be decomposed into + * NIKHANIT and SARA AA and to be in separate cells + * + * @return total number of glyphs written to @a res[] + * + * Calculates glyphs from Mac Thai glyph set for the given @a cell, + * and store the glyph string in @a res, terminated with '\\0'. + * If resulting glyphs are longer than the provided buffer, only + * the first @a res_sz glyphs are stored. + */ +int +th_render_cell_mac (struct thcell_t cell, + thglyph_t res[], size_t res_sz, + int is_decomp_am) +{ + return th_render_cell_ (cell, res, res_sz, is_decomp_am, &Mac_shape_table_); +} + +static int +th_render_text (const thchar_t *s, + thglyph_t res[], size_t res_sz, + int is_decomp_am, + int (*cell_rend_fn)(struct thcell_t, thglyph_t[], size_t, int)) +{ + size_t left = res_sz; + int len = strlen ((const char*) s); + + while (left > 0 && len > 0) { + struct thcell_t cell; + size_t nchars; + int nglyphs; + + nchars = th_next_cell (s, len, &cell, is_decomp_am); + s += nchars; len -= nchars; + nglyphs = (*cell_rend_fn) (cell, res, left, is_decomp_am); + res += nglyphs; left -= nglyphs; + } + + return res_sz - left; +} + +/** + * @brief Render the given text using TIS-620 glyph set + * + * @param s : the string to render + * @param res : the buffer for storing output glyph string + * @param res_sz : the size of @a res buffer + * @param is_decomp_am : whether SARA AM is to be decomposed into + * NIKHANIT and SARA AA and to be in separate cells + * + * @return total number of glyphs written to @a res[] + * + * Calculates glyphs from TIS-620 glyph set for the given string @a s, + * and store the glyph string in @a res, terminated with '\\0'. + * If resulting glyphs are longer than the provided buffer, only + * the first @a res_sz glyphs are stored. + */ +int +th_render_text_tis (const thchar_t *s, + thglyph_t res[], size_t res_sz, + int is_decomp_am) +{ + return th_render_text (s, res, res_sz, is_decomp_am, th_render_cell_tis); +} + +/** + * @brief Render the given text using Thai Windows glyph set + * + * @param s : the string to render + * @param res : the buffer for storing output glyph string + * @param res_sz : the size of @a res buffer + * @param is_decomp_am : whether SARA AM is to be decomposed into + * NIKHANIT and SARA AA and to be in separate cells + * + * @return total number of glyphs written to @a res[] + * + * Calculates glyphs from Thai Windows glyph set for the given string @a s, + * and store the glyph string in @a res, terminated with '\\0'. + * If resulting glyphs are longer than the provided buffer, only + * the first @a res_sz glyphs are stored. + */ +int +th_render_text_win (const thchar_t *s, + thglyph_t res[], size_t res_sz, + int is_decomp_am) +{ + return th_render_text (s, res, res_sz, is_decomp_am, th_render_cell_win); +} + +/** + * @brief Render the given text using Mac Thai glyph set + * + * @param s : the string to render + * @param res : the buffer for storing output glyph string + * @param res_sz : the size of @a res buffer + * @param is_decomp_am : whether SARA AM is to be decomposed into + * NIKHANIT and SARA AA and to be in separate cells + * + * @return total number of glyphs written to @a res[] + * + * Calculates glyphs from Mac Thai glyph set for the given string @a s, + * and store the glyph string in @a res, terminated with '\\0'. + * If resulting glyphs are longer than the provided buffer, only + * the first @a res_sz glyphs are stored. + */ +int +th_render_text_mac (const thchar_t *s, + thglyph_t res[], size_t res_sz, + int is_decomp_am) +{ + return th_render_text (s, res, res_sz, is_decomp_am, th_render_cell_mac); +} + +/* +vi:ts=4:ai:expandtab +*/ |