/* Pango * basic-ft2.c: * * Copyright (C) 1999 Red Hat Software * * 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 #include #include "pango-layout.h" #include "pango-engine.h" #include "pangoft2.h" #include "pango-utils.h" #define SCRIPT_ENGINE_NAME "BasicScriptEngineFT2" /* Zero Width characters: * * 200B ZERO WIDTH SPACE * 200C ZERO WIDTH NON-JOINER * 200D ZERO WIDTH JOINER * 200E LEFT-TO-RIGHT MARK * 200F RIGHT-TO-LEFT MARK * 202A LEFT-TO-RIGHT EMBEDDING * 202B RIGHT-TO-LEFT EMBEDDING * 202C POP DIRECTIONAL FORMATTING * 202D LEFT-TO-RIGHT OVERRIDE * 202E RIGHT-TO-LEFT OVERRIDE */ #define ZERO_WIDTH_CHAR(wc)\ (((wc) >= 0x200B && (wc) <= 0x200F) || ((wc) >= 0x202A && (wc) <= 0x202E)) static PangoEngineRange basic_ranges[] = { /* Basic Latin, Latin-1 Supplement, Latin Extended-A, Latin Extended-B, * IPA Extensions */ { 0x0000, 0x02af, "*" }, /* Spacing Modifier Letters */ { 0x02b0, 0x02ff, "" }, /* Not covered: Combining Diacritical Marks */ /* Greek, Cyrillic, Armenian */ { 0x0380, 0x058f, "*" }, /* Hebrew */ { 0x0591, 0x05f4, "" }, /* Arabic */ { 0x060c, 0x06f9, "" }, /* Not covered: Syriac, Thaana, Devanagari, Bengali, Gurmukhi, Gujarati, * Oriya, Tamil, Telugu, Kannada, Malayalam, Sinhala */ /* Thai */ { 0x0e01, 0x0e5b, "" }, /* Not covered: Lao, Tibetan, Myanmar, Georgian, Hangul Jamo, Ethiopic, * Cherokee, Unified Canadian Aboriginal Syllabics, Ogham, Runic, * Khmer, Mongolian */ /* Latin Extended Additional, Greek Extended */ { 0x1e00, 0x1fff, "*" }, /* General Punctuation, Superscripts and Subscripts, Currency Symbols, * Combining Marks for Symbols, Letterlike Symbols, Number Forms, * Arrows, Mathematical Operators, Miscellaneous Technical, * Control Pictures, Optical Character Recognition, Enclosed Alphanumerics, * Box Drawing, Block Elements, Geometric Shapes, Miscellaneous Symbols, * Dingbats, Braille Patterns, CJK Radicals Supplement, Kangxi Radicals, * Ideographic Description Characters, CJK Symbols and Punctuation, * Hiragana, Katakana, Bopomofo, Hangul Compatibility Jamo, Kanbun, * Bopomofo Extended, Enclosed CJK Letters and Months, CJK Compatibility, * CJK Unified Ideographs Extension A, CJK Unified Ideographs */ { 0x2000, 0x9fff, "*" }, /* Not covered: Yi Syllables, Yi Radicals */ /* Hangul Syllables */ { 0xac00, 0xd7a3, "kr" }, /* Not covered: Private Use */ /* CJK Compatibility Ideographs (partly) */ { 0xf900, 0xfa0b, "kr" }, /* Not covered: CJK Compatibility Ideographs (partly), * Alphabetic Presentation Forms, Arabic Presentation Forms-A, * Combining Half Marks, CJK Compatibility Forms, * Small Form Variants, Arabic Presentation Forms-B, * Specials */ /* Halfwidth and Fullwidth Forms (partly) */ { 0xff00, 0xffe3, "*" } /* Not covered: Halfwidth and Fullwidth Forms, Specials */ }; static PangoEngineInfo script_engines[] = { { SCRIPT_ENGINE_NAME, PANGO_ENGINE_TYPE_SHAPE, PANGO_RENDER_TYPE_FT2, basic_ranges, G_N_ELEMENTS(basic_ranges) } }; static gint n_script_engines = G_N_ELEMENTS (script_engines); /* * FT2 system script engine portion */ static PangoGlyph find_char (PangoFont *font, gunichar wc) { FT_Face face; FT_UInt index; face = pango_ft2_font_get_face (font); index = FT_Get_Char_Index (face, wc); if (index && index <= face->num_glyphs) return index; return 0; } static void set_glyph (PangoFont *font, PangoGlyphString *glyphs, int i, int offset, PangoGlyph glyph) { PangoRectangle logical_rect; glyphs->glyphs[i].glyph = glyph; glyphs->glyphs[i].geometry.x_offset = 0; glyphs->glyphs[i].geometry.y_offset = 0; glyphs->log_clusters[i] = offset; pango_font_get_glyph_extents (font, glyphs->glyphs[i].glyph, NULL, &logical_rect); glyphs->glyphs[i].geometry.width = logical_rect.width; if (i > 0) { glyphs->glyphs[i-1].geometry.width += pango_ft2_font_get_kerning (font, glyphs->glyphs[i-1].glyph, glyphs->glyphs[i].glyph); } } static void swap_range (PangoGlyphString *glyphs, int start, int end) { int i, j; for (i = start, j = end - 1; i < j; i++, j--) { PangoGlyphInfo glyph_info; gint log_cluster; glyph_info = glyphs->glyphs[i]; glyphs->glyphs[i] = glyphs->glyphs[j]; glyphs->glyphs[j] = glyph_info; log_cluster = glyphs->log_clusters[i]; glyphs->log_clusters[i] = glyphs->log_clusters[j]; glyphs->log_clusters[j] = log_cluster; } } static void basic_engine_shape (PangoFont *font, const char *text, gint length, PangoAnalysis *analysis, PangoGlyphString *glyphs) { int n_chars; int i; const char *p; g_return_if_fail (font != NULL); g_return_if_fail (text != NULL); g_return_if_fail (length >= 0); g_return_if_fail (analysis != NULL); n_chars = g_utf8_strlen (text, length); pango_glyph_string_set_size (glyphs, n_chars); p = text; for (i = 0; i < n_chars; i++) { gunichar wc; gunichar mirrored_ch; PangoGlyph index; wc = g_utf8_get_char (p); if (analysis->level % 2) if (pango_get_mirror_char (wc, &mirrored_ch)) wc = mirrored_ch; if (ZERO_WIDTH_CHAR (wc)) { set_glyph (font, glyphs, i, p - text, 0); } else { index = find_char (font, wc); if (index) { set_glyph (font, glyphs, i, p - text, index); if (g_unichar_type (wc) == G_UNICODE_NON_SPACING_MARK) { if (i > 0) { PangoRectangle logical_rect, ink_rect; glyphs->glyphs[i].geometry.width = MAX (glyphs->glyphs[i-1].geometry.width, glyphs->glyphs[i].geometry.width); glyphs->glyphs[i-1].geometry.width = 0; glyphs->log_clusters[i] = glyphs->log_clusters[i-1]; /* Some heuristics to try to guess how overstrike glyphs are * done and compensate */ pango_font_get_glyph_extents (font, glyphs->glyphs[i].glyph, &ink_rect, &logical_rect); if (logical_rect.width == 0 && ink_rect.x == 0) glyphs->glyphs[i].geometry.x_offset = (glyphs->glyphs[i].geometry.width - ink_rect.width) / 2; } } } else set_glyph (font, glyphs, i, p - text, pango_ft2_get_unknown_glyph (font)); } p = g_utf8_next_char (p); } /* Simple bidi support... may have separate modules later */ if (analysis->level % 2) { int start, end; /* Swap all glyphs */ swap_range (glyphs, 0, n_chars); /* Now reorder glyphs within each cluster back to LTR */ for (start = 0; start < n_chars;) { end = start; while (end < n_chars && glyphs->log_clusters[end] == glyphs->log_clusters[start]) end++; swap_range (glyphs, start, end); start = end; } } } static PangoCoverage * basic_engine_get_coverage (PangoFont *font, PangoLanguage *lang) { return pango_font_get_coverage (font, lang); } static PangoEngine * basic_engine_ft2_new (void) { 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 = basic_engine_shape; result->get_coverage = basic_engine_get_coverage; return (PangoEngine *)result; } /* The following three functions provide the public module API for * Pango */ #ifdef FT2_MODULE_PREFIX #define MODULE_ENTRY(func) _pango_basic_ft2_##func #else #define MODULE_ENTRY(func) func #endif void MODULE_ENTRY(script_engine_list) (PangoEngineInfo **engines, gint *n_engines) { *engines = script_engines; *n_engines = n_script_engines; } PangoEngine * MODULE_ENTRY(script_engine_load) (const char *id) { if (!strcmp (id, SCRIPT_ENGINE_NAME)) return basic_engine_ft2_new (); else return NULL; } void MODULE_ENTRY(script_engine_unload) (PangoEngine *engine) { }