diff options
Diffstat (limited to 'modules/thai/thai-ft2.c')
| -rw-r--r-- | modules/thai/thai-ft2.c | 270 |
1 files changed, 270 insertions, 0 deletions
diff --git a/modules/thai/thai-ft2.c b/modules/thai/thai-ft2.c new file mode 100644 index 00000000..964952d0 --- /dev/null +++ b/modules/thai/thai-ft2.c @@ -0,0 +1,270 @@ +/* Pango + * thai-ft2.c: + * + * Copyright (C) 1999 Red Hat Software + * Author: Owen Taylor <otaylor@redhat.com> + * + * Copyright (C) 2002 NECTEC + * Author: Theppitak Karoonboonyanan <thep@links.nectec.or.th> + * + * Copyright (c) 1996-2000 by Sun Microsystems, Inc. + * Author: Chookij Vanatham <Chookij.Vanatham@Eng.Sun.COM> + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Library General Public + * License as published by the Free Software Foundation; either + * version 2 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 + * Library General Public License for more details. + * + * You should have received a copy of the GNU Library General Public + * License along with this library; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 02111-1307, USA. + */ + + +#include <string.h> + +#include <glib.h> +#include "pango-engine.h" +#include "pangoft2.h" +#include "thai-shaper.h" + +#define SCRIPT_ENGINE_NAME "ThaiScriptEngineFT2" + +/* We handle the range U+0e01 to U+0e5b exactly + */ +static PangoEngineRange thai_ranges[] = { + { 0x0e01, 0x0e5b, "*" }, /* Thai */ +}; + +static PangoEngineInfo script_engines[] = { + { + SCRIPT_ENGINE_NAME, + PANGO_ENGINE_TYPE_SHAPE, + PANGO_RENDER_TYPE_FT2, + thai_ranges, G_N_ELEMENTS(thai_ranges) + } +}; + +/* TIS-to-Unicode glyph maps for characters 0x80-0xff + */ +static int tis620_0[128] = { + /**/ 0, 0, 0, 0, 0, 0, 0, 0, + /**/ 0, 0, 0, 0, 0, 0, 0, 0, + /**/ 0, 0, 0, 0, 0, 0, 0, 0, + /**/ 0, 0, 0, 0, 0, 0, 0, 0, + 0x0020, 0x0e01, 0x0e02, 0x0e03, 0x0e04, 0x0e05, 0x0e06, 0x0e07, + 0x0e08, 0x0e09, 0x0e0a, 0x0e0b, 0x0e0c, 0x0e0d, 0x0e0e, 0x0e0f, + 0x0e10, 0x0e11, 0x0e12, 0x0e13, 0x0e14, 0x0e15, 0x0e16, 0x0e17, + 0x0e18, 0x0e19, 0x0e1a, 0x0e1b, 0x0e1c, 0x0e1d, 0x0e1e, 0x0e1f, + 0x0e20, 0x0e21, 0x0e22, 0x0e23, 0x0e24, 0x0e25, 0x0e26, 0x0e27, + 0x0e28, 0x0e29, 0x0e2a, 0x0e2b, 0x0e2c, 0x0e2d, 0x0e2e, 0x0e2f, + 0x0e30, 0x0e31, 0x0e32, 0x0e33, 0x0e34, 0x0e35, 0x0e36, 0x0e37, + 0x0e38, 0x0e39, 0x0e3a, 0, 0, 0, 0, 0x0e3f, + 0x0e40, 0x0e41, 0x0e42, 0x0e43, 0x0e44, 0x0e45, 0x0e46, 0x0e47, + 0x0e48, 0x0e49, 0x0e4a, 0x0e4b, 0x0e4c, 0x0e4d, 0x0e4e, 0x0e4f, + 0x0e50, 0x0e51, 0x0e52, 0x0e53, 0x0e54, 0x0e55, 0x0e56, 0x0e57, + 0x0e58, 0x0e59, 0x0e5a, 0x0e5b, 0, 0, 0, 0 +}; + +static int tis620_1[128] = { + 0x00ab, 0x00bb, 0x2026, 0xf88c, 0xf88f, 0xf892, 0xf895, 0xf898, + 0xf88b, 0xf88e, 0xf891, 0xf894, 0xf897, 0x201c, 0x201d, 0xf899, + /**/ 0, 0x2022, 0xf884, 0xf889, 0xf885, 0xf886, 0xf887, 0xf888, + 0xf88a, 0xf88d, 0xf890, 0xf893, 0xf896, 0x2018, 0x2019, 0, + 0x00a0, 0x0e01, 0x0e02, 0x0e03, 0x0e04, 0x0e05, 0x0e06, 0x0e07, + 0x0e08, 0x0e09, 0x0e0a, 0x0e0b, 0x0e0c, 0x0e0d, 0x0e0e, 0x0e0f, + 0x0e10, 0x0e11, 0x0e12, 0x0e13, 0x0e14, 0x0e15, 0x0e16, 0x0e17, + 0x0e18, 0x0e19, 0x0e1a, 0x0e1b, 0x0e1c, 0x0e1d, 0x0e1e, 0x0e1f, + 0x0e20, 0x0e21, 0x0e22, 0x0e23, 0x0e24, 0x0e25, 0x0e26, 0x0e27, + 0x0e28, 0x0e29, 0x0e2a, 0x0e2b, 0x0e2c, 0x0e2d, 0x0e2e, 0x0e2f, + 0x0e30, 0x0e31, 0x0e32, 0x0e33, 0x0e34, 0x0e35, 0x0e36, 0x0e37, + 0x0e38, 0x0e39, 0x0e3a, 0xfeff, 0x200b, 0x2013, 0x2014, 0x0e3f, + 0x0e40, 0x0e41, 0x0e42, 0x0e43, 0x0e44, 0x0e45, 0x0e46, 0x0e47, + 0x0e48, 0x0e49, 0x0e4a, 0x0e4b, 0x0e4c, 0x0e4d, 0x2122, 0x0e4f, + 0x0e50, 0x0e51, 0x0e52, 0x0e53, 0x0e54, 0x0e55, 0x0e56, 0x0e57, + 0x0e58, 0x0e59, 0x00ae, 0x00a9, 0, 0, 0, 0 +}; + +static int tis620_2[128] = { + 0xf700, 0xf701, 0xf702, 0xf703, 0xf704, 0x2026, 0xf705, 0xf706, + 0xf707, 0xf708, 0xf709, 0xf70a, 0xf70b, 0xf70c, 0xf70d, 0xf70e, + 0xf70f, 0x2018, 0x2019, 0x201c, 0x201d, 0x2022, 0x2013, 0x2014, + 0xf710, 0xf711, 0xf712, 0xf713, 0xf714, 0xf715, 0xf716, 0xf717, + 0x00a0, 0x0e01, 0x0e02, 0x0e03, 0x0e04, 0x0e05, 0x0e06, 0x0e07, + 0x0e08, 0x0e09, 0x0e0a, 0x0e0b, 0x0e0c, 0x0e0d, 0x0e0e, 0x0e0f, + 0x0e10, 0x0e11, 0x0e12, 0x0e13, 0x0e14, 0x0e15, 0x0e16, 0x0e17, + 0x0e18, 0x0e19, 0x0e1a, 0x0e1b, 0x0e1c, 0x0e1d, 0x0e1e, 0x0e1f, + 0x0e20, 0x0e21, 0x0e22, 0x0e23, 0x0e24, 0x0e25, 0x0e26, 0x0e27, + 0x0e28, 0x0e29, 0x0e2a, 0x0e2b, 0x0e2c, 0x0e2d, 0x0e2e, 0x0e2f, + 0x0e30, 0x0e31, 0x0e32, 0x0e33, 0x0e34, 0x0e35, 0x0e36, 0x0e37, + 0x0e38, 0x0e39, 0x0e3a, 0, 0, 0, 0, 0x0e3f, + 0x0e40, 0x0e41, 0x0e42, 0x0e43, 0x0e44, 0x0e45, 0x0e46, 0x0e47, + 0x0e48, 0x0e49, 0x0e4a, 0x0e4b, 0x0e4c, 0x0e4d, 0x0e4e, 0x0e4f, + 0x0e50, 0x0e51, 0x0e52, 0x0e53, 0x0e54, 0x0e55, 0x0e56, 0x0e57, + 0x0e58, 0x0e59, 0x0e5a, 0x0e5b, 0xf718, 0xf719, 0xf71a, 0 +}; + +static int +contain_glyphs(PangoFont *font, const int glyph_map[128]) +{ + unsigned char c; + FT_Face face; + + face = pango_ft2_font_get_face (font); + + for (c = 0; c < 0x80; c++) + { + if (glyph_map[c]) + { + if (!FT_Get_Char_Index (face, glyph_map[c])) + return 0; + } + } + return 1; +} + +static PangoGlyph +thai_ft2_make_glyph (ThaiFontInfo *font_info, unsigned int c) +{ + int index; + PangoGlyph result; + + switch (font_info->font_set) { + case THAI_FONT_ISO10646:index = c; break; + case THAI_FONT_TIS: index = (c & 0x80) ? tis620_0[c & 0x7f] : c; break; + case THAI_FONT_TIS_MAC: index = (c & 0x80) ? tis620_1[c & 0x7f] : c; break; + case THAI_FONT_TIS_WIN: index = (c & 0x80) ? tis620_2[c & 0x7f] : c; break; + default: index = 0; break; + } + + result = FT_Get_Char_Index (pango_ft2_font_get_face (font_info->font), index); + if (result) + return result; + else + return pango_ft2_get_unknown_glyph (font_info->font); +} + +static PangoGlyph +thai_ft2_make_unknown_glyph (ThaiFontInfo *font_info, unsigned int c) +{ + return pango_ft2_get_unknown_glyph (font_info->font); +} + +/* Returns a structure with information we will use to rendering given the + * #PangoFont. This is computed once per font and cached for later retrieval. + */ +static ThaiFontInfo * +thai_ft2_get_font_info (PangoFont *font) +{ + ThaiFontInfo *font_info; + GQuark info_id = g_quark_from_string ("thai-font-info"); + + font_info = g_object_get_qdata (G_OBJECT (font), info_id); + + if (!font_info) + { + /* No cached information not found, so we need to compute it + * from scratch + */ + font_info = g_new (ThaiFontInfo, 1); + font_info->font = font; + + /* detect font set by determining availibility of glyphs */ + if (contain_glyphs(font, tis620_2)) + font_info->font_set = THAI_FONT_TIS_WIN; + else if (contain_glyphs(font, tis620_1)) + font_info->font_set = THAI_FONT_TIS_MAC; + else if (contain_glyphs(font, tis620_0)) + font_info->font_set = THAI_FONT_TIS; + else + font_info->font_set = THAI_FONT_ISO10646; + + font_info->make_glyph = thai_ft2_make_glyph; + font_info->make_unknown_glyph = thai_ft2_make_unknown_glyph; + + g_object_set_qdata_full (G_OBJECT (font), info_id, font_info, (GDestroyNotify)g_free); + } + + return font_info; +} + +static void +thai_engine_ft2_shape (PangoFont *font, + const char *text, + gint length, + PangoAnalysis *analysis, + PangoGlyphString *glyphs) +{ + ThaiFontInfo *font_info; + + font_info = thai_ft2_get_font_info (font); + thai_engine_shape(font_info, text, length, analysis, glyphs); +} + +static PangoCoverage * +thai_engine_ft2_get_coverage (PangoFont *font, + PangoLanguage *lang) +{ + return pango_font_get_coverage (font, lang); +} + +static PangoEngine * +thai_engine_ft2_new () +{ + PangoEngineShape *result; + + result = g_new (PangoEngineShape, 1); + + result->engine.id = SCRIPT_ENGINE_NAME; + result->engine.type = PANGO_ENGINE_TYPE_SHAPE; + result->engine.length = sizeof (result); + result->script_shape = thai_engine_ft2_shape; + result->get_coverage = thai_engine_ft2_get_coverage; + + return (PangoEngine *)result; +} + +/* The following three functions provide the public module API for + * Pango. If we are compiling it as a module, then we name the + * entry points script_engine_list, etc. But if we are compiling + * it for inclusion directly in Pango, then we need them to + * to have distinct names for this module, so we prepend + * _pango_thai_ft2_ + */ +#ifdef FT2_MODULE_PREFIX +#define MODULE_ENTRY(func) _pango_thai_ft2_##func +#else +#define MODULE_ENTRY(func) func +#endif + +/* List the engines contained within this module + */ +void +MODULE_ENTRY(script_engine_list) (PangoEngineInfo **engines, gint *n_engines) +{ + *engines = script_engines; + *n_engines = G_N_ELEMENTS (script_engines); +} + +/* Load a particular engine given the ID for the engine + */ +PangoEngine * +MODULE_ENTRY(script_engine_load) (const char *id) +{ + if (!strcmp (id, SCRIPT_ENGINE_NAME)) + return thai_engine_ft2_new (); + else + return NULL; +} + +void +MODULE_ENTRY(script_engine_unload) (PangoEngine *engine) +{ +} + |