/* Pango * indic-xft.c: * * Copyright (C) 2001, 2002 IBM Corporation * Author: Eric Mader * Based on arabic-xft.c by Owen Taylor * * 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 "indic-ot.h" #include "pango-engine.h" #include "pango-ot.h" #include "pango-utils.h" #include "pangofc-font.h" typedef struct _PangoIndicInfo PangoIndicInfo; typedef struct _IndicEngineFc IndicEngineFc; typedef PangoEngineShapeClass IndicEngineFcClass ; /* No extra fields needed */ struct _IndicEngineFc { PangoEngineShape shapeEngine; const PangoIndicInfo *indicInfo; }; struct _PangoIndicInfo { PangoOTTag scriptTag; const IndicOTClassTable *classTable; const gchar *gsubQuarkName; const gchar *gposQuarkName; }; #define ENGINE_SUFFIX "ScriptEngineFc" #define RENDER_TYPE PANGO_RENDER_TYPE_FC #define INDIC_ENGINE_INFO(script) {#script ENGINE_SUFFIX, PANGO_ENGINE_TYPE_SHAPE, RENDER_TYPE, script##_scripts, G_N_ELEMENTS(script##_scripts)} #define PANGO_INDIC_INFO(script) {OT_TAG_##script, &script##_class_table, "pango-indic-" #script "-GSUB-ruleset", "pango-indic-" #script "-GPOS-rulsest"} #define OT_TAG_deva FT_MAKE_TAG('d','e','v','a') #define OT_TAG_beng FT_MAKE_TAG('b','e','n','g') #define OT_TAG_guru FT_MAKE_TAG('g','u','r','u') #define OT_TAG_gujr FT_MAKE_TAG('g','u','j','r') #define OT_TAG_orya FT_MAKE_TAG('o','r','y','a') #define OT_TAG_taml FT_MAKE_TAG('t','a','m','l') #define OT_TAG_telu FT_MAKE_TAG('t','e','l','u') #define OT_TAG_knda FT_MAKE_TAG('k','n','d','a') #define OT_TAG_mlym FT_MAKE_TAG('m','l','y','m') #define OT_TAG_sinh FT_MAKE_TAG('s','i','n','h') static PangoEngineScriptInfo deva_scripts[] = { { PANGO_SCRIPT_DEVANAGARI, "*" } }; static PangoEngineScriptInfo beng_scripts[] = { {PANGO_SCRIPT_BENGALI, "*" } }; static PangoEngineScriptInfo guru_scripts[] = { { PANGO_SCRIPT_GURMUKHI, "*" } }; static PangoEngineScriptInfo gujr_scripts[] = { { PANGO_SCRIPT_GUJARATI, "*" } }; static PangoEngineScriptInfo orya_scripts[] = { { PANGO_SCRIPT_ORIYA, "*" } }; static PangoEngineScriptInfo taml_scripts[] = { { PANGO_SCRIPT_TAMIL, "*" } }; static PangoEngineScriptInfo telu_scripts[] = { { PANGO_SCRIPT_TELUGU, "*" } }; static PangoEngineScriptInfo knda_scripts[] = { { PANGO_SCRIPT_KANNADA, "*" } }; static PangoEngineScriptInfo mlym_scripts[] = { { PANGO_SCRIPT_MALAYALAM, "*" } }; static PangoEngineScriptInfo sinh_scripts[] = { { PANGO_SCRIPT_SINHALA, "*" } }; static PangoEngineInfo script_engines[] = { INDIC_ENGINE_INFO(deva), INDIC_ENGINE_INFO(beng), INDIC_ENGINE_INFO(guru), INDIC_ENGINE_INFO(gujr), INDIC_ENGINE_INFO(orya), INDIC_ENGINE_INFO(taml), INDIC_ENGINE_INFO(telu), INDIC_ENGINE_INFO(knda), INDIC_ENGINE_INFO(mlym), INDIC_ENGINE_INFO(sinh) }; /* * WARNING: These entries need to be in the same order as the entries * in script_engines[]. * * FIXME: remove this requirement, either by encapsulating the order * in a macro that calls a body macro that can be redefined, or by * putting the pointers to the PangoEngineInfo in PangoIndicInfo... */ static const PangoIndicInfo indic_info[] = { PANGO_INDIC_INFO(deva), PANGO_INDIC_INFO(beng), PANGO_INDIC_INFO(guru), PANGO_INDIC_INFO(gujr), PANGO_INDIC_INFO(orya), PANGO_INDIC_INFO(taml), PANGO_INDIC_INFO(telu), PANGO_INDIC_INFO(knda), PANGO_INDIC_INFO(mlym), PANGO_INDIC_INFO(sinh) }; static void maybe_add_GSUB_feature (PangoOTRuleset *ruleset, PangoOTInfo *info, guint script_index, PangoOTTag feature_tag, gulong property_bit) { guint feature_index; /* 0xffff == default language system */ if (pango_ot_info_find_feature (info, PANGO_OT_TABLE_GSUB, feature_tag, script_index, 0xffff, &feature_index)) { /* printf("Added GSUB feature '%c%c%c%c' = %8.8X\n", feature_tag>>24, feature_tag>>16&0xFF, feature_tag>>8&0xFF, feature_tag&0xFF, property_bit); */ pango_ot_ruleset_add_feature (ruleset, PANGO_OT_TABLE_GSUB, feature_index, property_bit); } } static void maybe_add_GPOS_feature (PangoOTRuleset *ruleset, PangoOTInfo *info, guint script_index, PangoOTTag feature_tag, gulong property_bit) { guint feature_index; if (pango_ot_info_find_feature (info, PANGO_OT_TABLE_GPOS, feature_tag,script_index, 0xffff, &feature_index)) { /* printf("Added GPOS feature '%c%c%c%c' = %8.8X\n", feature_tag>>24, feature_tag>>16&0xFF, feature_tag>>8&0xFF, feature_tag&0xFF, property_bit); */ pango_ot_ruleset_add_feature (ruleset, PANGO_OT_TABLE_GPOS, feature_index, property_bit); } } static PangoOTRuleset * get_gsub_ruleset (FT_Face face, const PangoIndicInfo *indic_info) { PangoOTInfo *info = pango_ot_info_get (face); GQuark ruleset_quark = g_quark_from_string (indic_info->gsubQuarkName); PangoOTRuleset *ruleset; if (!info) return NULL; ruleset = g_object_get_qdata (G_OBJECT (info), ruleset_quark); if (!ruleset) { guint script_index; ruleset = pango_ot_ruleset_new (info); if (pango_ot_info_find_script (info, PANGO_OT_TABLE_GSUB, indic_info->scriptTag, &script_index)) { maybe_add_GSUB_feature (ruleset, info, script_index, FT_MAKE_TAG ('i','n','i','t'), init); maybe_add_GSUB_feature (ruleset, info, script_index, FT_MAKE_TAG ('n','u','k','t'), nukt); maybe_add_GSUB_feature (ruleset, info, script_index, FT_MAKE_TAG ('a','k','h','n'), akhn); maybe_add_GSUB_feature (ruleset, info, script_index, FT_MAKE_TAG ('r','p','h','f'), rphf); maybe_add_GSUB_feature (ruleset, info, script_index, FT_MAKE_TAG ('b','l','w','f'), blwf); maybe_add_GSUB_feature (ruleset, info, script_index, FT_MAKE_TAG ('h','a','l','f'), half); maybe_add_GSUB_feature (ruleset, info, script_index, FT_MAKE_TAG ('p','s','t','f'), pstf); maybe_add_GSUB_feature (ruleset, info, script_index, FT_MAKE_TAG ('v','a','t','u'), vatu); maybe_add_GSUB_feature (ruleset, info, script_index, FT_MAKE_TAG ('p','r','e','s'), pres); maybe_add_GSUB_feature (ruleset, info, script_index, FT_MAKE_TAG ('b','l','w','s'), blws); maybe_add_GSUB_feature (ruleset, info, script_index, FT_MAKE_TAG ('a','b','v','s'), abvs); maybe_add_GSUB_feature (ruleset, info, script_index, FT_MAKE_TAG ('p','s','t','s'), psts); maybe_add_GSUB_feature (ruleset, info, script_index, FT_MAKE_TAG ('h','a','l','n'), haln); } g_object_set_qdata_full (G_OBJECT (info), ruleset_quark, ruleset, (GDestroyNotify)g_object_unref); } return ruleset; } static PangoOTRuleset * get_gpos_ruleset (FT_Face face, const PangoIndicInfo *indic_info) { PangoOTInfo *info = pango_ot_info_get (face); GQuark ruleset_quark = g_quark_from_string (indic_info->gposQuarkName); PangoOTRuleset *ruleset; if (!info) return NULL; ruleset = g_object_get_qdata (G_OBJECT (info), ruleset_quark); if (!ruleset) { guint script_index; ruleset = pango_ot_ruleset_new (info); if (1 && pango_ot_info_find_script (info, PANGO_OT_TABLE_GPOS, indic_info->scriptTag, &script_index)) { maybe_add_GPOS_feature (ruleset, info, script_index, FT_MAKE_TAG ('b','l','w','m'), blwm); maybe_add_GPOS_feature (ruleset, info, script_index, FT_MAKE_TAG ('a','b','v','m'), abvm); maybe_add_GPOS_feature (ruleset, info, script_index, FT_MAKE_TAG ('d','i','s','t'), dist); } g_object_set_qdata_full (G_OBJECT (info), ruleset_quark, ruleset, (GDestroyNotify)g_object_unref); } return ruleset; } static void set_glyphs (PangoFont *font, FT_Face face, const gunichar *wcs, gulong *tags, glong n_glyphs, PangoOTBuffer *buffer, gboolean process_zwj) { gint i; g_assert (face); for (i = 0; i < n_glyphs; i += 1) { guint glyph; if (pango_is_zero_width (wcs[i]) && (!process_zwj || wcs[i] != 0x200D)) glyph = 0; else glyph = FT_Get_Char_Index (face, wcs[i]); pango_ot_buffer_add_glyph (buffer, glyph, tags[i], i); } } /* * FIXME: should this check for null pointers, etc.? */ static gunichar * expand_text(const gchar *text, glong length, glong **offsets, glong *n_chars) { const gchar *p; gunichar *wcs, *wco; glong i, *oo; *n_chars = g_utf8_strlen (text, length); wcs = g_new (gunichar, *n_chars); *offsets = g_new (glong, *n_chars + 1); p = text; wco = wcs; oo = *offsets; for (i = 0; i < *n_chars; i += 1) { *wco++ = g_utf8_get_char (p); *oo++ = p - text; p = g_utf8_next_char (p); } *oo = p - text; return wcs; } /* analysis->shape_engine has the PangoEngine... */ static void indic_engine_shape (PangoEngineShape *engine, PangoFont *font, const char *text, gint length, PangoAnalysis *analysis, PangoGlyphString *glyphs) { glong i, n_chars, n_glyphs; gulong *tags = NULL; gunichar *wc_in = NULL, *wc_out = NULL; glong *utf8_offsets = NULL; glong *indices = NULL; FT_Face face; PangoOTRuleset *gsub_ruleset = NULL, *gpos_ruleset = NULL; PangoOTBuffer *buffer; IndicEngineFc *indic_shape_engine = NULL; const PangoIndicInfo *indic_info = NULL; PangoFcFont *fc_font; MPreFixups *mprefixups; g_return_if_fail (font != NULL); g_return_if_fail (text != NULL); g_return_if_fail (length >= 0); g_return_if_fail (analysis != NULL); fc_font = PANGO_FC_FONT (font); face = pango_fc_font_lock_face (fc_font); g_assert (face != NULL); indic_shape_engine = (IndicEngineFc *) engine; indic_info = indic_shape_engine->indicInfo; wc_in = expand_text (text, length, &utf8_offsets, &n_chars); n_glyphs = indic_ot_reorder (wc_in, utf8_offsets, n_chars, indic_info->classTable, NULL, NULL, NULL, NULL); wc_out = g_new (gunichar, n_glyphs); indices = g_new (glong, n_glyphs); tags = g_new (gulong, n_glyphs); n_glyphs = indic_ot_reorder (wc_in, utf8_offsets, n_chars, indic_info->classTable, wc_out, indices, tags, &mprefixups); pango_glyph_string_set_size (glyphs, n_glyphs); buffer = pango_ot_buffer_new (fc_font); set_glyphs(font, face, wc_out, tags, n_glyphs, buffer, (indic_info->classTable->scriptFlags & SF_PROCESS_ZWJ) != 0); /* do gsub processing */ gsub_ruleset = get_gsub_ruleset (face, indic_info); if (gsub_ruleset != NULL) pango_ot_ruleset_substitute (gsub_ruleset, buffer); /* Fix pre-modifiers for some scripts before base consonant */ if (mprefixups) { indic_mprefixups_apply (mprefixups, buffer); indic_mprefixups_free (mprefixups); } /* do gpos processing */ gpos_ruleset = get_gpos_ruleset (face, indic_info); if (gpos_ruleset != NULL) pango_ot_ruleset_position (gpos_ruleset, buffer); pango_ot_buffer_output (buffer, glyphs); /* Get the right log_clusters values */ for (i = 0; i < glyphs->num_glyphs; i += 1) glyphs->log_clusters[i] = indices[glyphs->log_clusters[i]]; pango_fc_font_unlock_face (fc_font); pango_ot_buffer_destroy (buffer); g_free (tags); g_free (indices); g_free (wc_out); g_free (wc_in); g_free (utf8_offsets); } static void indic_engine_fc_class_init (PangoEngineShapeClass *class) { class->script_shape = indic_engine_shape; } PANGO_ENGINE_SHAPE_DEFINE_TYPE (IndicEngineFc, indic_engine_fc, indic_engine_fc_class_init, NULL); void PANGO_MODULE_ENTRY(init) (GTypeModule *module) { indic_engine_fc_register_type (module); } void PANGO_MODULE_ENTRY(exit) (void) { } void PANGO_MODULE_ENTRY(list) (PangoEngineInfo **engines, int *n_engines) { *engines = script_engines; *n_engines = G_N_ELEMENTS (script_engines); } PangoEngine * PANGO_MODULE_ENTRY(create) (const char *id) { guint i; for (i = 0; i < G_N_ELEMENTS(script_engines); i += 1) { if (!strcmp(id, script_engines[i].id)) { IndicEngineFc *engine = g_object_new (indic_engine_fc_type, NULL); engine->indicInfo = &indic_info[i]; return (PangoEngine *)engine; } } return NULL; }