1 /* m17n-flt.c -- Font Layout Table sub-module.
2 Copyright (C) 2003, 2004, 2007
3 National Institute of Advanced Industrial Science and Technology (AIST)
4 Registration Number H15PRO112
6 This file is part of the m17n library.
8 The m17n library is free software; you can redistribute it and/or
9 modify it under the terms of the GNU Lesser General Public License
10 as published by the Free Software Foundation; either version 2.1 of
11 the License, or (at your option) any later version.
13 The m17n library is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 Lesser General Public License for more details.
18 You should have received a copy of the GNU Lesser General Public
19 License along with the m17n library; if not, write to the Free
20 Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
25 @brief FLT support for a window system.
27 This section defines the m17n FLT API concerning character
28 layouting facility using FLT (Font Layout Table). */
32 #if !defined (FOR_DOXYGEN) || defined (DOXYGEN_INTERNAL_MODULE)
33 /*** @addtogroup m17nInternal
42 #include <sys/types.h>
45 #include "m17n-core.h"
47 #include "m17n-misc.h"
53 #include "internal-flt.h"
57 /* Font Layout Table (FLT)
59 Predefined terms: SYMBOL, INTEGER, STRING
61 FLT ::= '(' STAGE + ')'
63 STAGE ::= CATEGORY-TABLE ? FONT-LAYOUT-RULE
65 ;; Each STAGE consumes a source (code sequence) and produces another
66 ;; code sequence that is given to the next STAGE as a source. The
67 ;; source given to the first stage is a sequence of character codes
68 ;; that are assigned category codes by CATEGORY-TABLE. The output of
69 ;; the last stage is a glyph code sequence given to the renderer.
72 '(' 'category' CATEGORY-SPEC + ')'
74 '(' CODE [ CODE ] CATEGORY ')'
77 ;; ASCII character codes of alphabet ('A' .. 'Z' 'a' .. 'z').
80 ;; (0x0900 0x097F ?E) ; All Devanagari characters
81 ;; (0x093C ?N)) ; DEVANAGARI-LETTER NUKTA
82 ;; Assign the category 'E' to all Devanagari characters but 0x093C,
83 ;; assign the category 'N' to 0x093C.
86 '(' 'generator' RULE MACRO-DEF * ')'
88 RULE ::= COMMAND | REGEXP-RULE | MATCH-RULE | MAP-RULE
89 | COND-STRUCT | MACRO-NAME
92 DIRECT-CODE | COMBINING | PREDEFIND-COMMAND | OTF-COMMAND
94 DIRECT-CODE ::= INTEGER
95 ;; Always succeed. Produce the code. Consume no source.
98 '=' | '*' | '<' | '>' | '|'
100 ;; '=': Succeed when the current run contains at least one code.
101 ;; Consume the first code in the current run, and produce it as is.
103 ;; '*': If the the previous command succeeded, repeat it until it
106 ;; '<': Produce a special code that indicates the start of grapheme
107 ;; cluster. Succeed always, consume nothing.
109 ;; '>': Produce a special code that indicates the end of grapheme
110 ;; cluster. Succeed always, consume nothing.
112 ;; '|': Produce a special code whose category is ' '. Succeed always,
116 'otf:''SCRIPT'[':'['LANGSYS'][':'[GSUB-FEATURES][':'GPOS-FEATURES]]]
117 ;; Run the Open Type Layout Table on the current run. Succeed always,
121 ;; OTF's ScriptTag name (four letters) listed at:
122 ;; <http://www.microsoft.om/typograph/otspec/scripttags.htm>
124 ;; OTF's Language System name (four letters) listed at:
125 ;; <http://www.microsoft.om/typograph/otspec/languagetags.htm>
127 GSUB-FEATURES ::= [FEATURE[,FEATURE]*] | ' '
128 GPOS-FEATURES ::= [FEATURE[,FEATURE]*] | ' '
130 ;; OTF's Feature name (four letters) listed at:
131 ;; <http://www.microsoft.om/typograph/otspec/???.htm>
133 OTF-TAG ::= PRINTABLE-CHAR PRINTABLE-CHAR PRINTABLE-CHAR PRINTABLE-CHAR
137 ;; Run all features in the default langsys of 'deva' script.
138 ;; 'otf:deva::nukt:haln'
139 ;; Run all GSUB features, run 'nukt' and 'haln' GPOS features.
141 ;; Run all GSUB features, run no GPOS features.
144 '(' REGEXP RULE * ')'
146 ;; Succeed if REGXP matches the head of source. Run RULEs while
147 ;; limiting the source to the matching part. Consume that part.
150 ;; Must be composed only from ASCII characters. 'A' - 'Z', 'a' - 'z'
151 ;; correspond to CATEGORY.
158 '(' MATCH-IDX RULE * ')'
160 ;; Succeed if the previous REGEXP-RULE found a matching part for
161 ;; MATCH-IDX. Run RULEs while limiting the source to the matching
162 ;; part. If MATCH-IDX is zero, consume the whole part, else consume
165 MATCH-IDX ::= INTEGER
172 '(' ( SOURCE-SEQ | SOURCE-RANGE ) RULE * ')'
174 ;; Succeed if the source matches SOURCE-SEQ or SOURCE-RANGE. Run
175 ;; RULEs while limiting the source to the matching part. Consume that
181 '(' 'range' CODE CODE ')'
183 ;; ((0x0915 0x094D) 0x43)
184 ;; If the source code sequence is 0x0915 0x094D, produce 0x43.
185 ;; ((range 0x0F40 0x0F6A) 0x2221)
186 ;; If the first source code CODE is in the range 0x0F40..0x0F6A,
187 ;; produce (0x2221 + (CODE - 0x0F40)).
190 '(' 'cond' RULE + ')'
192 ;; Try each rule in sequence until one succeeds. Succeed if one
193 ;; succeeds. Consume nothing.
197 ;; ((0x0915 0x094D) 0x43)
198 ;; ((range 0x0F40 0x0F6A) 0x2221)
201 COMBINING ::= 'V''H''O''V''H'
202 V ::= ( 't' | 'c' | 'b' | 'B' )
203 H ::= ( 'l' | 'c' | 'r' )
204 O ::= ( '.' | XOFF | YOFF | XOFF YOFF )
205 XOFF ::= '<'INTEGER | '>'INTEGER
206 YOFF ::= '+'INTEGER | '-'INTEGER
207 ;; INTEGER must be integer 0..127
209 ;; VH pair indicates 12 reference points of a glyph as below:
211 ;; 0----1----2 <---- ascent 0:tl (top-left)
212 ;; | | 1:tc (top-center)
213 ;; | | 2:tr (top-right)
214 ;; | | 3:Bl (base-left)
215 ;; 9 10 11 <---- center 4:Bc (base-center)
216 ;; | | 5:Br (base-right)
217 ;; --3----4----5-- <-- baseline 6:bl (bottom-left)
218 ;; | | 7:bc (bottom-center)
219 ;; 6----7----8 <---- descent 8:br (bottom-right)
220 ;; 9:cl (center-left)
221 ;; | | | 10:cc (center-center)
222 ;; left center right 11:cr (center-right)
226 ;; Align top-left point of the previous glyph and bottom-center
227 ;; point of the current glyph.
229 ;; Align 20% left and 10% below of base-left point of the previous
230 ;; glyph and base-right point of the current glyph.
233 '(' MACRO-NAME RULE + ')'
234 MACRO-NAME ::= SYMBOL
238 static int mdebug_flag = MDEBUG_FONT_FLT;
240 MSymbol Mfont, Mlayouter, Mcombining;
242 static MSymbol Mgenerator, Mend;
244 static MPlist *flt_list;
245 static int flt_min_coverage, flt_max_coverage;
249 CombiningCodeMask = 0xFFFFFFF,
250 LeftPaddingMask = 1 << 28,
251 RightPaddingMask = 1 << 29
254 #define SET_GLYPH_INFO(g, mask, ctx, info) \
255 ((g)->internal = (((g)->internal & ~(mask)) | (info)), \
256 (ctx)->check_mask |= (mask))
258 #define GET_COMBINING_CODE(g) ((g)->internal & CombiningCodeMask)
259 #define SET_COMBINING_CODE(g, ctx, code) \
260 SET_GLYPH_INFO (g, CombiningCodeMask, ctx, code)
261 #define GET_LEFT_PADDING(g) ((g)->internal & LeftPaddingMask)
262 #define SET_LEFT_PADDING(g, ctx, flag) \
263 SET_GLYPH_INFO (g, LeftPaddingMask, ctx, flag)
264 #define GET_RIGHT_PADDING(g) ((g)->internal & RightPaddingMask)
265 #define SET_RIGHT_PADDING(g, ctx, flag) \
266 SET_GLYPH_INFO (g, RightPaddingMask, ctx, flag)
267 #define GET_ENCODED(g) ((g)->encoded)
268 #define SET_ENCODED(g, flag) ((g)->encoded = (flag))
269 #define GET_MEASURED(g) ((g)->measured)
270 #define SET_MEASURED(g, flag) ((g)->measured = (flag))
272 #define GINIT(gstring, n) \
274 if (! (gstring)->glyph_size) \
275 (gstring)->glyph_size = sizeof (MFLTGlyph); \
276 (gstring)->glyphs = alloca ((gstring)->glyph_size * (n)); \
277 (gstring)->allocated = (n); \
278 (gstring)->used = 0; \
281 #define GALLOCA (gstring) \
282 ((MFLTGlyph *) alloca ((gstring)->glyph_size))
284 #define GREF(gstring, idx) \
285 ((MFLTGlyph *) ((char *) ((gstring)->glyphs) + (gstring)->glyph_size * (idx)))
287 #define PREV(gstring, g) \
288 ((MFLTGlyph *) ((char *) (g) - (gstring)->glyph_size))
290 #define NEXT(gstring, g) \
291 ((MFLTGlyph *) ((char *) (g) + (gstring)->glyph_size))
293 #define GCPY(src, src_idx, n, tgt, tgt_idx) \
295 memcpy ((char *) ((tgt)->glyphs) + (tgt)->glyph_size * (tgt_idx), \
296 (char *) ((src)->glyphs) + (src)->glyph_size * (src_idx), \
297 (src)->glyph_size * (n)); \
300 #define GDUP(ctx, idx) \
302 MFLTGlyphString *src = (ctx)->in; \
303 MFLTGlyphString *tgt = (ctx)->out; \
304 if (tgt->allocated <= tgt->used) \
306 GCPY (src, (idx), 1, tgt, tgt->used); \
311 GREPLACE (MFLTGlyphString *src, int src_from, int src_to,
312 MFLTGlyphString *tgt, int tgt_from, int tgt_to)
314 int src_len = src_to - src_from;
315 int tgt_len = tgt_to - tgt_from;
316 int inc = src_len - tgt_len;
318 if (tgt->allocated < tgt->used + inc)
320 if (inc != 0 && tgt_to < tgt->used)
321 memmove ((char *) tgt->glyphs + tgt->glyph_size * (tgt_from + src_len),
322 (char *) tgt->glyphs + tgt->glyph_size * tgt_to,
323 tgt->glyph_size * (tgt->used - tgt_to));
325 memcpy ((char *) tgt->glyphs + tgt->glyph_size * tgt_from,
326 (char *) src->glyphs + src->glyph_size * src_from,
327 src->glyph_size * src_len);
336 -0x0F .. -2 : builtin commands
337 -0x100000F .. -0x10 : combining code
338 ... -0x1000010: index to FontLayoutStage->cmds
341 #define INVALID_CMD_ID -1
342 #define CMD_ID_OFFSET_BUILTIN -3
343 #define CMD_ID_OFFSET_COMBINING -0x10
344 #define CMD_ID_OFFSET_INDEX -0x1000010
346 /* Builtin commands. */
347 #define CMD_ID_COPY -3 /* '=' */
348 #define CMD_ID_REPEAT -4 /* '*' */
349 #define CMD_ID_CLUSTER_BEGIN -5 /* '<' */
350 #define CMD_ID_CLUSTER_END -6 /* '>' */
351 #define CMD_ID_SEPARATOR -7 /* '|' */
352 #define CMD_ID_LEFT_PADDING -8 /* '[' */
353 #define CMD_ID_RIGHT_PADDING -9 /* ']' */
355 #define CMD_ID_TO_COMBINING_CODE(id) (CMD_ID_OFFSET_COMBINING - (id))
356 #define COMBINING_CODE_TO_CMD_ID(code) (CMD_ID_OFFSET_COMBINING - (code))
358 #define CMD_ID_TO_INDEX(id) (CMD_ID_OFFSET_INDEX - (id))
359 #define INDEX_TO_CMD_ID(idx) (CMD_ID_OFFSET_INDEX - (idx))
361 static MSymbol Mcond, Mrange, Mfont_facility;
363 #define GLYPH_CODE_P(code) \
364 ((code) >= GLYPH_CODE_MIN && (code) <= GLYPH_CODE_MAX)
366 #define GLYPH_CODE_INDEX(code) ((code) - GLYPH_CODE_MIN)
368 #define UPDATE_CLUSTER_RANGE(ctx, g) \
370 if ((ctx)->cluster_begin_idx >= 0) \
372 if (ctx->cluster_begin_pos > (g)->from) \
373 ctx->cluster_begin_pos = (g)->from; \
374 if (ctx->cluster_end_pos < (g)->to) \
375 ctx->cluster_end_pos = (g)->to; \
379 enum FontLayoutCmdRuleSrcType
391 enum FontLayoutCmdRuleSrcType src_type;
406 MFLTOtfSpec otf_spec;
415 /* Beginning and end indices of series of SEQ commands. */
416 int seq_beg, seq_end;
417 /* Range of the first character appears in the above series. */
418 int seq_from, seq_to;
424 enum FontLayoutCmdType
426 FontLayoutCmdTypeRule,
427 FontLayoutCmdTypeCond,
428 FontLayoutCmdTypeOTF,
434 enum FontLayoutCmdType type;
436 FontLayoutCmdRule rule;
437 FontLayoutCmdCond cond;
444 MCharTable *category;
456 MCharTable *coverage;
460 /* Font layout table loader */
462 static int parse_otf_command (MSymbol symbol, MFLTOtfSpec *spec);
464 /* Load a category table from PLIST. PLIST has this form:
465 PLIST ::= ( FROM-CODE TO-CODE ? CATEGORY-CHAR ) *
469 load_category_table (MPlist *plist)
473 table = mchartable (Minteger, (void *) 0);
475 MPLIST_DO (plist, plist)
478 int from, to, category_code;
480 if (! MPLIST_PLIST (plist))
481 MERROR (MERROR_FONT, NULL);
482 elt = MPLIST_PLIST (plist);
483 if (! MPLIST_INTEGER_P (elt))
484 MERROR (MERROR_FONT, NULL);
485 from = MPLIST_INTEGER (elt);
486 elt = MPLIST_NEXT (elt);
487 if (! MPLIST_INTEGER_P (elt))
488 MERROR (MERROR_FONT, NULL);
489 to = MPLIST_INTEGER (elt);
490 elt = MPLIST_NEXT (elt);
491 if (MPLIST_TAIL_P (elt))
498 if (! MPLIST_INTEGER_P (elt))
499 MERROR (MERROR_FONT, NULL);
500 category_code = MPLIST_INTEGER (elt);
502 if (! isalnum (category_code))
503 MERROR (MERROR_FONT, NULL);
506 mchartable_set (table, from, (void *) category_code);
508 mchartable_set_range (table, from, to, (void *) category_code);
515 gen_otf_tag (char *p)
517 unsigned int tag = 0;
520 for (i = 0; i < 4 && *p; i++, p++)
521 tag = (tag << 8) | *p;
523 tag = (tag << 8) | 0x20;
528 otf_count_features (char *p, char *end, char stopper, int *count)
533 if (*p != stopper && *p != '\0')
540 if (*p == stopper || *p == '\0')
554 if (*p == stopper || *p == '\0')
566 otf_store_features (char *p, char *end, unsigned *buf)
571 for (i = 0; p < end;)
574 buf[i++] = 0xFFFFFFFF, p += 2, negative = 1;
578 buf[i++] = 0xFFFFFFFF;
579 buf[i++] = gen_otf_tag (p + 1), p += 6;
582 buf[i++] = gen_otf_tag (p), p += 5;
588 parse_otf_command (MSymbol symbol, MFLTOtfSpec *spec)
590 char *str = MSYMBOL_NAME (symbol);
591 char *end = str + MSYMBOL_NAMELEN (symbol);
592 unsigned int script, langsys;
594 int gsub_count = 0, gpos_count = 0;
597 memset (spec, 0, sizeof (MFLTOtfSpec));
600 str += 5; /* skip the heading ":otf=" */
601 script = gen_otf_tag (str);
605 langsys = gen_otf_tag (str);
612 /* Apply all GSUB features. */
617 str = otf_count_features (p, end, '+', &gsub_count);
619 MERROR (MERROR_FLT, -1);
623 /* Apply all GPOS features. */
628 str = otf_count_features (p, end, '\0', &gpos_count);
630 MERROR (MERROR_FLT, -1);
633 spec->script = script;
634 spec->langsys = langsys;
637 spec->features[0] = malloc (sizeof (int) * (gsub_count + 1));
638 if (! spec->features[0])
641 otf_store_features (gsub + 1, gpos, spec->features[0]);
643 spec->features[0][0] = 0xFFFFFFFF, spec->features[0][1] = 0;
647 spec->features[1] = malloc (sizeof (int) * (gpos_count + 1));
648 if (! spec->features[1])
650 if (spec->features[0])
651 free (spec->features[0]);
655 otf_store_features (gpos + 1, str, spec->features[1]);
657 spec->features[1][0] = 0xFFFFFFFF, spec->features[1][1] = 0;
663 /* Parse OTF command name NAME and store the result in CMD.
665 :SCRIPT[/[LANGSYS][=[GSUB-FEATURES][+GPOS-FEATURES]]]
666 where GSUB-FEATURES and GPOS-FEATURES have this form:
667 [FEATURE[,FEATURE]*] | ' ' */
670 load_otf_command (FontLayoutCmd *cmd, MSymbol sym)
672 char *name = MSYMBOL_NAME (sym);
677 /* This is old format of "otf:...". Change it to ":otf=...". */
678 char *str = alloca (MSYMBOL_NAMELEN (sym) + 2);
680 sprintf (str, ":otf=");
681 strcat (str, name + 4);
685 result = parse_otf_command (sym, &cmd->body.otf);
688 cmd->type = FontLayoutCmdTypeOTF;
693 /* Read a decimal number from STR preceded by one of "+-><". '+' and
694 '>' means a plus sign, '-' and '<' means a minus sign. If the
695 number is greater than 127, limit it to 127. */
698 read_decimal_number (char **str)
701 int sign = (*p == '-' || *p == '<') ? -1 : 1;
705 while (*p >= '0' && *p <= '9')
706 n = n * 10 + *p++ - '0';
710 return (n < 127 ? n * sign : 127 * sign);
714 /* Read a horizontal and vertical combining positions from STR, and
715 store them in the place pointed by X and Y. The horizontal
716 position left, center, and right are represented by 0, 1, and 2
717 respectively. The vertical position top, center, bottom, and base
718 are represented by 0, 1, 2, and 3 respectively. If successfully
719 read, return 0, else return -1. */
722 read_combining_position (char *str, int *x, int *y)
727 /* Vertical position comes first. */
728 for (i = 0; i < 4; i++)
737 /* Then comse horizontal position. */
738 for (i = 0; i < 3; i++)
748 /* Return a combining code corresponding to SYM. */
751 get_combining_command (MSymbol sym)
753 char *str = msymbol_name (sym);
754 int base_x, base_y, add_x, add_y, off_x, off_y;
757 if (read_combining_position (str, &base_x, &base_y) < 0)
768 if (c == '+' || c == '-')
770 off_y = read_decimal_number (&str) + 128;
775 if (c == '<' || c == '>')
776 off_x = read_decimal_number (&str) + 128;
780 if (read_combining_position (str, &add_x, &add_y) < 0)
783 c = MAKE_COMBINING_CODE (base_y, base_x, add_y, add_x, off_y, off_x);
784 return (COMBINING_CODE_TO_CMD_ID (c));
788 /* Load a command from PLIST into STAGE, and return that
789 identification number. If ID is not INVALID_CMD_ID, that means we
790 are loading a top level command or a macro. In that case, use ID
791 as the identification number of the command. Otherwise, generate a
792 new id number for the command. MACROS is a list of raw macros. */
795 load_command (FontLayoutStage *stage, MPlist *plist,
796 MPlist *macros, int id)
801 if (MPLIST_INTEGER_P (plist))
803 int code = MPLIST_INTEGER (plist);
806 MERROR (MERROR_DRAW, INVALID_CMD_ID);
809 else if (MPLIST_PLIST_P (plist))
811 /* PLIST ::= ( cond ... ) | ( STRING ... ) | ( INTEGER ... )
812 | ( ( INTEGER INTEGER ) ... )
813 | ( ( range INTEGER INTEGER ) ... )
814 | ( ( font-facilty [ INTEGER ] ) ... )
815 | ( ( font-facilty OTF-SPEC ) ... ) */
816 MPlist *elt = MPLIST_PLIST (plist);
817 int len = MPLIST_LENGTH (elt) - 1;
820 if (id == INVALID_CMD_ID)
823 id = INDEX_TO_CMD_ID (stage->used);
824 MLIST_APPEND1 (stage, cmds, dummy, MERROR_DRAW);
826 cmd = stage->cmds + CMD_ID_TO_INDEX (id);
828 if (MPLIST_SYMBOL_P (elt))
830 FontLayoutCmdCond *cond;
832 if (MPLIST_SYMBOL (elt) != Mcond)
833 MERROR (MERROR_DRAW, INVALID_CMD_ID);
834 elt = MPLIST_NEXT (elt);
835 cmd->type = FontLayoutCmdTypeCond;
836 cond = &cmd->body.cond;
837 cond->seq_beg = cond->seq_end = -1;
838 cond->seq_from = cond->seq_to = 0;
840 MTABLE_CALLOC (cond->cmd_ids, len, MERROR_DRAW);
841 for (i = 0; i < len; i++, elt = MPLIST_NEXT (elt))
843 int this_id = load_command (stage, elt, macros, INVALID_CMD_ID);
845 if (this_id == INVALID_CMD_ID || this_id == -2)
846 MERROR (MERROR_DRAW, this_id);
847 /* The above load_command may relocate stage->cmds. */
848 cmd = stage->cmds + CMD_ID_TO_INDEX (id);
849 cond = &cmd->body.cond;
850 cond->cmd_ids[i] = this_id;
851 if (this_id <= CMD_ID_OFFSET_INDEX)
853 FontLayoutCmd *this_cmd
854 = stage->cmds + CMD_ID_TO_INDEX (this_id);
856 if (this_cmd->type == FontLayoutCmdTypeRule
857 && this_cmd->body.rule.src_type == SRC_SEQ)
859 int first_char = this_cmd->body.rule.src.seq.codes[0];
861 if (cond->seq_beg < 0)
863 /* The first SEQ command. */
865 cond->seq_from = cond->seq_to = first_char;
867 else if (cond->seq_end < 0)
869 /* The following SEQ command. */
870 if (cond->seq_from > first_char)
871 cond->seq_from = first_char;
872 else if (cond->seq_to < first_char)
873 cond->seq_to = first_char;
878 if (cond->seq_beg >= 0 && cond->seq_end < 0)
879 /* The previous one is the last SEQ command. */
885 if (cond->seq_beg >= 0 && cond->seq_end < 0)
886 /* The previous one is the last SEQ command. */
890 if (cond->seq_beg >= 0 && cond->seq_end < 0)
891 /* The previous one is the last SEQ command. */
896 cmd->type = FontLayoutCmdTypeRule;
897 if (MPLIST_MTEXT_P (elt))
899 MText *mt = MPLIST_MTEXT (elt);
900 char *str = (char *) MTEXT_DATA (mt);
904 mtext_ins_char (mt, 0, '^', 1);
905 str = (char *) MTEXT_DATA (mt);
907 if (regcomp (&cmd->body.rule.src.re.preg, str, REG_EXTENDED))
908 MERROR (MERROR_FONT, INVALID_CMD_ID);
909 cmd->body.rule.src_type = SRC_REGEX;
910 cmd->body.rule.src.re.pattern = strdup (str);
912 else if (MPLIST_INTEGER_P (elt))
914 cmd->body.rule.src_type = SRC_INDEX;
915 cmd->body.rule.src.match_idx = MPLIST_INTEGER (elt);
917 else if (MPLIST_PLIST_P (elt))
919 MPlist *pl = MPLIST_PLIST (elt);
920 int size = MPLIST_LENGTH (pl);
922 if (MPLIST_INTEGER_P (pl))
926 cmd->body.rule.src_type = SRC_SEQ;
927 cmd->body.rule.src.seq.n_codes = size;
928 MTABLE_CALLOC (cmd->body.rule.src.seq.codes, size,
930 for (i = 0; i < size; i++, pl = MPLIST_NEXT (pl))
932 if (! MPLIST_INTEGER_P (pl))
933 MERROR (MERROR_DRAW, INVALID_CMD_ID);
934 cmd->body.rule.src.seq.codes[i]
935 = (unsigned) MPLIST_INTEGER (pl);
938 else if (MPLIST_SYMBOL_P (pl) && size == 3)
940 if (MPLIST_SYMBOL (pl) != Mrange)
941 MERROR (MERROR_FLT, INVALID_CMD_ID);
942 cmd->body.rule.src_type = SRC_RANGE;
943 pl = MPLIST_NEXT (pl);
944 if (! MPLIST_INTEGER_P (pl))
945 MERROR (MERROR_DRAW, INVALID_CMD_ID);
946 cmd->body.rule.src.range.from
947 = (unsigned) MPLIST_INTEGER (pl);
948 pl = MPLIST_NEXT (pl);
949 if (! MPLIST_INTEGER_P (pl))
950 MERROR (MERROR_DRAW, INVALID_CMD_ID);
951 cmd->body.rule.src.range.to
952 = (unsigned) MPLIST_INTEGER (pl);
954 else if (MPLIST_SYMBOL_P (pl) && size <= 2)
956 if (MPLIST_SYMBOL (pl) != Mfont_facility)
957 MERROR (MERROR_FLT, INVALID_CMD_ID);
958 pl = MPLIST_NEXT (pl);
959 if (MPLIST_SYMBOL_P (pl))
961 MSymbol sym = MPLIST_SYMBOL (pl);
962 char *otf_spec = MSYMBOL_NAME (sym);
964 if (otf_spec[0] == ':' && otf_spec[1] == 'o'
965 && otf_spec[2] == 't' && otf_spec[3] == 'f')
966 parse_otf_command (sym, &cmd->body.rule.src.otf_spec);
968 MERROR (MERROR_FLT, INVALID_CMD_ID);
969 cmd->body.rule.src_type = SRC_OTF_SPEC;
973 cmd->body.rule.src_type = SRC_HAS_GLYPH;
974 if (MPLIST_INTEGER_P (pl))
975 cmd->body.rule.src.supported_glyph
976 = MPLIST_INTEGER (pl);
978 cmd->body.rule.src.supported_glyph = -1;
982 MERROR (MERROR_DRAW, INVALID_CMD_ID);
985 MERROR (MERROR_DRAW, INVALID_CMD_ID);
987 elt = MPLIST_NEXT (elt);
988 cmd->body.rule.n_cmds = len;
989 MTABLE_CALLOC (cmd->body.rule.cmd_ids, len, MERROR_DRAW);
990 for (i = 0; i < len; i++, elt = MPLIST_NEXT (elt))
992 int this_id = load_command (stage, elt, macros, INVALID_CMD_ID);
994 if (this_id == INVALID_CMD_ID || this_id == -2)
995 MERROR (MERROR_DRAW, this_id);
996 /* The above load_command may relocate stage->cmds. */
997 cmd = stage->cmds + CMD_ID_TO_INDEX (id);
998 cmd->body.rule.cmd_ids[i] = this_id;
1002 else if (MPLIST_SYMBOL_P (plist))
1005 MSymbol sym = MPLIST_SYMBOL (plist);
1006 char *name = msymbol_name (sym);
1007 int len = strlen (name);
1011 && ((name[0] == 'o' && name[1] == 't'
1012 && name[2] == 'f' && name[3] == ':')
1013 || (name[0] == ':' && name[1] == 'o' && name[2] == 't'
1014 && name[3] == 'f' && name[4] == '=')))
1016 result = load_otf_command (&cmd, sym);
1019 if (id == INVALID_CMD_ID)
1021 id = INDEX_TO_CMD_ID (stage->used);
1022 MLIST_APPEND1 (stage, cmds, cmd, MERROR_DRAW);
1025 stage->cmds[CMD_ID_TO_INDEX (id)] = cmd;
1033 else if (*name == '*')
1034 return CMD_ID_REPEAT;
1035 else if (*name == '<')
1036 return CMD_ID_CLUSTER_BEGIN;
1037 else if (*name == '>')
1038 return CMD_ID_CLUSTER_END;
1039 else if (*name == '|')
1040 return CMD_ID_SEPARATOR;
1041 else if (*name == '[')
1042 return CMD_ID_LEFT_PADDING;
1043 else if (*name == ']')
1044 return CMD_ID_RIGHT_PADDING;
1050 id = get_combining_command (sym);
1056 MPLIST_DO (elt, macros)
1058 if (sym == MPLIST_SYMBOL (MPLIST_PLIST (elt)))
1060 id = INDEX_TO_CMD_ID (i);
1061 if (stage->cmds[i].type == FontLayoutCmdTypeMAX)
1062 id = load_command (stage, MPLIST_NEXT (MPLIST_PLIST (elt)),
1068 MERROR (MERROR_DRAW, INVALID_CMD_ID);
1071 MERROR (MERROR_DRAW, INVALID_CMD_ID);
1077 free_flt_command (FontLayoutCmd *cmd)
1079 if (cmd->type == FontLayoutCmdTypeRule)
1081 FontLayoutCmdRule *rule = &cmd->body.rule;
1083 if (rule->src_type == SRC_REGEX)
1085 free (rule->src.re.pattern);
1086 regfree (&rule->src.re.preg);
1088 else if (rule->src_type == SRC_SEQ)
1089 free (rule->src.seq.codes);
1090 free (rule->cmd_ids);
1092 else if (cmd->type == FontLayoutCmdTypeCond)
1093 free (cmd->body.cond.cmd_ids);
1094 else if (cmd->type == FontLayoutCmdTypeOTF)
1096 if (cmd->body.otf.features[0])
1097 free (cmd->body.otf.features[0]);
1098 if (cmd->body.otf.features[1])
1099 free (cmd->body.otf.features[1]);
1103 /* Load a generator from PLIST into a newly allocated FontLayoutStage,
1104 and return it. PLIST has this form:
1105 PLIST ::= ( COMMAND ( CMD-NAME COMMAND ) * )
1108 static FontLayoutStage *
1109 load_generator (MPlist *plist)
1111 FontLayoutStage *stage;
1113 FontLayoutCmd dummy;
1116 MSTRUCT_CALLOC (stage, MERROR_DRAW);
1117 MLIST_INIT1 (stage, cmds, 32);
1118 dummy.type = FontLayoutCmdTypeMAX;
1119 MLIST_APPEND1 (stage, cmds, dummy, MERROR_FONT);
1120 MPLIST_DO (elt, MPLIST_NEXT (plist))
1122 if (! MPLIST_PLIST_P (elt))
1123 MERROR (MERROR_FONT, NULL);
1124 pl = MPLIST_PLIST (elt);
1125 if (! MPLIST_SYMBOL_P (pl))
1126 MERROR (MERROR_FONT, NULL);
1127 MLIST_APPEND1 (stage, cmds, dummy, MERROR_FONT);
1130 /* Load the first command from PLIST into STAGE->cmds[0]. Macros
1131 called in the first command are also loaded from MPLIST_NEXT
1132 (PLIST) into STAGE->cmds[n]. */
1133 result = load_command (stage, plist, MPLIST_NEXT (plist),
1134 INDEX_TO_CMD_ID (0));
1135 if (result == INVALID_CMD_ID || result == -2)
1137 MLIST_FREE1 (stage, cmds);
1146 /* Load stages of the font layout table FLT. */
1149 load_flt (MFLT *flt, MPlist *key_list)
1151 MPlist *top, *plist, *pl, *p;
1152 MCharTable *category = NULL;
1156 top = (MPlist *) mdatabase__load_for_keys (flt->mdb, key_list);
1158 top = (MPlist *) mdatabase_load (flt->mdb);
1161 if (! MPLIST_PLIST_P (top))
1163 M17N_OBJECT_UNREF (top);
1164 MERROR (MERROR_FLT, -1);
1169 plist = mdatabase__props (flt->mdb);
1171 MERROR (MERROR_FLT, -1);
1172 MPLIST_DO (plist, plist)
1173 if (MPLIST_PLIST_P (plist))
1175 pl = MPLIST_PLIST (plist);
1176 if (! MPLIST_SYMBOL_P (pl)
1177 || MPLIST_SYMBOL (pl) != Mfont)
1179 pl = MPLIST_NEXT (pl);
1180 if (! MPLIST_PLIST_P (pl))
1182 p = MPLIST_PLIST (pl);
1183 if (! MPLIST_SYMBOL_P (p))
1185 p = MPLIST_NEXT (p);
1186 if (! MPLIST_SYMBOL_P (p))
1188 flt->family = MPLIST_SYMBOL (p);
1189 MPLIST_DO (p, MPLIST_NEXT (p))
1190 if (MPLIST_SYMBOL_P (p))
1192 sym = MPLIST_SYMBOL (p);
1193 if (MSYMBOL_NAME (sym)[0] != ':')
1194 flt->registry = sym, sym = Mnil;
1200 char *otf_spec = MSYMBOL_NAME (sym);
1202 if (otf_spec[0] == ':' && otf_spec[1] == 'o'
1203 && otf_spec[2] == 't' && otf_spec[3] == 'f')
1204 parse_otf_command (sym, &flt->otf);
1209 MPLIST_DO (plist, top)
1211 if (MPLIST_SYMBOL_P (plist)
1212 && MPLIST_SYMBOL (plist) == Mend)
1214 mplist_set (plist, Mnil, NULL);
1217 if (! MPLIST_PLIST (plist))
1219 pl = MPLIST_PLIST (plist);
1220 if (! MPLIST_SYMBOL_P (pl))
1222 sym = MPLIST_SYMBOL (pl);
1223 pl = MPLIST_NEXT (pl);
1226 if (sym == Mcategory)
1229 M17N_OBJECT_UNREF (category);
1230 else if (flt->coverage)
1232 category = flt->coverage;
1235 category = load_category_table (pl);
1236 if (! flt->coverage)
1238 flt->coverage = category;
1239 M17N_OBJECT_REF (category);
1242 else if (sym == Mgenerator)
1244 FontLayoutStage *stage;
1248 stage = load_generator (pl);
1251 stage->category = category;
1252 M17N_OBJECT_REF (category);
1254 flt->stages = mplist ();
1255 mplist_add (flt->stages, Mt, stage);
1259 M17N_OBJECT_UNREF (category);
1260 M17N_OBJECT_UNREF (top);
1261 if (! MPLIST_TAIL_P (plist))
1263 M17N_OBJECT_UNREF (flt->stages);
1264 MERROR (MERROR_FLT, -1);
1271 free_flt_stage (FontLayoutStage *stage)
1275 M17N_OBJECT_UNREF (stage->category);
1276 for (i = 0; i < stage->used; i++)
1277 free_flt_command (stage->cmds + i);
1278 MLIST_FREE1 (stage, cmds);
1289 MPLIST_DO (plist, flt_list)
1291 MFLT *flt = MPLIST_VAL (plist);
1294 M17N_OBJECT_UNREF (flt->coverage);
1297 MPLIST_DO (pl, MPLIST_NEXT (flt->stages))
1298 free_flt_stage (MPLIST_VAL (pl));
1299 M17N_OBJECT_UNREF (flt->stages);
1302 M17N_OBJECT_UNREF (flt_list);
1309 MPlist *plist, *key_list = NULL;
1313 if (! (plist = mdatabase_list (Mfont, Mlayouter, Mnil, Mnil)))
1315 if (! (flt_list = mplist ()))
1317 if (! (key_list = mplist ()))
1319 if (! mplist_add (key_list, Mcategory, Mt))
1322 MPLIST_DO (pl, plist)
1324 MDatabase *mdb = MPLIST_VAL (pl);
1325 MSymbol *tags = mdatabase_tag (mdb);
1328 if (! MSTRUCT_CALLOC_SAFE (flt))
1330 flt->name = tags[2];
1332 if (load_flt (flt, key_list) < 0)
1336 if (MPLIST_TAIL_P (flt_list))
1338 flt_min_coverage = mchartable_min_char (flt->coverage);
1339 flt_max_coverage = mchartable_max_char (flt->coverage);
1345 c = mchartable_min_char (flt->coverage);
1346 if (flt_min_coverage > c)
1347 flt_min_coverage = c;
1348 c = mchartable_max_char (flt->coverage);
1349 if (flt_max_coverage < c)
1350 flt_max_coverage = c;
1352 if (! mplist_push (flt_list, flt->name, flt))
1362 M17N_OBJECT_UNREF (plist);
1363 M17N_OBJECT_UNREF (key_list);
1367 /* FLS (Font Layout Service) */
1369 /* Structure to hold information about a context of FLS. */
1373 /* Pointer to the current stage. */
1374 FontLayoutStage *stage;
1376 /* Pointer to the font. */
1379 /* Input and output glyph string. */
1380 MFLTGlyphString *in, *out;
1382 /* Encode each character or code of a glyph by the current category
1383 table into this array. An element is a category letter used for
1384 a regular expression matching. */
1388 int cluster_begin_idx;
1389 int cluster_begin_pos;
1390 int cluster_end_pos;
1394 } FontLayoutContext;
1396 static int run_command (int, int, int, int, FontLayoutContext *);
1401 run_rule (int depth,
1402 FontLayoutCmdRule *rule, int from, int to, FontLayoutContext *ctx)
1404 int *saved_match_indices = ctx->match_indices;
1405 int match_indices[NMATCH * 2];
1408 int orig_from = from;
1410 if (rule->src_type == SRC_SEQ)
1414 len = rule->src.seq.n_codes;
1415 if (len > (to - from))
1417 for (i = 0; i < len; i++)
1418 if (rule->src.seq.codes[i] != GREF (ctx->in, from + i)->code)
1423 if (MDEBUG_FLAG () > 2)
1424 MDEBUG_PRINT3 ("\n [FLT] %*s(SEQ 0x%X", depth, "",
1425 rule->src.seq.codes[0]);
1427 else if (rule->src_type == SRC_RANGE)
1433 head = GREF (ctx->in, from)->code;
1434 if (head < rule->src.range.from || head > rule->src.range.to)
1436 ctx->code_offset = head - rule->src.range.from;
1438 if (MDEBUG_FLAG () > 2)
1439 MDEBUG_PRINT4 ("\n [FLT] %*s(RANGE 0x%X-0x%X", depth, "",
1440 rule->src.range.from, rule->src.range.to);
1442 else if (rule->src_type == SRC_REGEX)
1444 regmatch_t pmatch[NMATCH];
1450 saved_code = ctx->encoded[to];
1451 ctx->encoded[to] = '\0';
1452 result = regexec (&(rule->src.re.preg),
1453 ctx->encoded + from, NMATCH, pmatch, 0);
1454 if (result == 0 && pmatch[0].rm_so == 0)
1456 if (MDEBUG_FLAG () > 2)
1457 MDEBUG_PRINT5 ("\n [FLT] %*s(REGEX \"%s\" \"%s\" %d", depth, "",
1458 rule->src.re.pattern,
1459 ctx->encoded + from,
1461 ctx->encoded[to] = saved_code;
1462 for (i = 0; i < NMATCH; i++)
1464 if (pmatch[i].rm_so < 0)
1465 match_indices[i * 2] = match_indices[i * 2 + 1] = -1;
1468 match_indices[i * 2] = from + pmatch[i].rm_so;
1469 match_indices[i * 2 + 1] = from + pmatch[i].rm_eo;
1472 ctx->match_indices = match_indices;
1473 to = match_indices[1];
1477 ctx->encoded[to] = saved_code;
1481 else if (rule->src_type == SRC_INDEX)
1483 if (rule->src.match_idx >= NMATCH)
1485 from = ctx->match_indices[rule->src.match_idx * 2];
1488 to = ctx->match_indices[rule->src.match_idx * 2 + 1];
1489 if (MDEBUG_FLAG () > 2)
1490 MDEBUG_PRINT3 ("\n [FLT] %*s(INDEX %d", depth, "", rule->src.match_idx);
1492 else if (rule->src_type == SRC_HAS_GLYPH)
1497 if (rule->src.supported_glyph < 0)
1501 code = GREF (ctx->in, from)->code;
1503 encoded = GREF (ctx->in, from)->encoded;
1507 code = rule->src.supported_glyph;
1513 static MFLTGlyphString gstring;
1515 if (! gstring.glyph_size)
1517 gstring.glyph_size = ctx->in->glyph_size;
1518 gstring.glyphs = calloc (1, gstring.glyph_size);
1519 gstring.allocated = 1;
1522 gstring.glyphs[0].code = code;
1523 if (ctx->font->get_glyph_id (ctx->font, &gstring, 0, 1) < 0
1524 || ! gstring.glyphs[0].encoded)
1528 else if (rule->src_type == SRC_OTF_SPEC)
1530 MFLTOtfSpec *spec = &rule->src.otf_spec;
1532 if (! ctx->font->check_otf)
1534 if ((spec->features[0] && spec->features[0][0] != 0xFFFFFFFF)
1535 || (spec->features[1] && spec->features[1][0] != 0xFFFFFFFF))
1538 else if (! ctx->font->check_otf (ctx->font, spec))
1544 for (i = 0; i < rule->n_cmds; i++)
1548 if (rule->cmd_ids[i] == CMD_ID_REPEAT)
1554 pos = run_command (depth, rule->cmd_ids[i], from, to, ctx);
1557 consumed = pos > from;
1562 ctx->match_indices = saved_match_indices;
1563 if (MDEBUG_FLAG () > 2)
1565 return (rule->src_type == SRC_INDEX ? orig_from : to);
1569 run_cond (int depth,
1570 FontLayoutCmdCond *cond, int from, int to, FontLayoutContext *ctx)
1574 if (MDEBUG_FLAG () > 2)
1575 MDEBUG_PRINT2 ("\n [FLT] %*s(COND", depth, "");
1577 for (i = 0; i < cond->n_cmds; i++)
1579 /* TODO: Write a code for optimization utilizaing the info
1581 if ((pos = run_command (depth, cond->cmd_ids[i], from, to, ctx))
1587 if (MDEBUG_FLAG () > 2)
1594 MFLTOtfSpec *otf_spec, int from, int to, FontLayoutContext *ctx)
1596 MFLTFont *font = ctx->font;
1597 int from_idx = ctx->out->used;
1599 if (MDEBUG_FLAG () > 2)
1600 MDEBUG_PRINT3 ("\n [FLT] %*s%s", depth, "", MSYMBOL_NAME (otf_spec->sym));
1602 font->get_glyph_id (font, ctx->in, from, to);
1603 if (! font->drive_otf)
1605 if (ctx->out->used + (to - from) > ctx->out->allocated)
1607 font->get_metrics (font, ctx->in, from, to);
1608 GCPY (ctx->in, from, to - from, ctx->out, ctx->out->used);
1609 ctx->out->used += to - from;
1613 MFLTGlyphAdjustment *adjustment;
1617 adjustment = alloca ((sizeof *adjustment)
1618 * (ctx->out->allocated - ctx->out->used));
1620 MERROR (MERROR_FLT, -1);
1621 memset (adjustment, 0,
1622 (sizeof *adjustment) * (ctx->out->allocated - ctx->out->used));
1623 to = font->drive_otf (font, otf_spec, ctx->in, from, to, ctx->out,
1627 out_len = ctx->out->used - from_idx;
1628 if (otf_spec->features[1])
1630 MFLTGlyphAdjustment *a;
1633 for (i = 0, a = adjustment; i < out_len; i++, a++)
1638 font->get_metrics (font, ctx->out, from_idx, ctx->out->used);
1639 for (g = GREF (ctx->out, from_idx + i);
1640 i < out_len; i++, a++, g = NEXT (ctx->out, g))
1643 if (a->advance_is_absolute)
1648 else if (a->xadv || a->yadv)
1653 if (a->xoff || a->yoff)
1656 MFLTGlyph *gg = PREV (ctx->out, g);
1657 MFLTGlyphAdjustment *aa = a;
1661 while (aa->back > 0)
1663 for (j = 0; j < aa->back;
1664 j++, gg = PREV (ctx->out, gg))
1665 g->xoff -= gg->xadv;
1667 g->xoff += aa->xoff;
1668 g->yoff += aa->yoff;
1677 if (ctx->cluster_begin_idx >= 0)
1678 for (; from_idx < ctx->out->used; from_idx++)
1680 MFLTGlyph *g = GREF (ctx->out, from_idx);
1681 UPDATE_CLUSTER_RANGE (ctx, g);
1686 static char work[16];
1689 dump_combining_code (int code)
1691 char *vallign = "tcbB";
1692 char *hallign = "lcr";
1698 work[0] = vallign[COMBINING_CODE_BASE_Y (code)];
1699 work[1] = hallign[COMBINING_CODE_BASE_X (code)];
1700 off_y = COMBINING_CODE_OFF_Y (code);
1701 off_x = COMBINING_CODE_OFF_X (code);
1703 sprintf (work + 2, "+%d", off_y);
1705 sprintf (work + 2, "%d", off_y);
1706 else if (off_x == 0)
1707 sprintf (work + 2, ".");
1708 p = work + strlen (work);
1710 sprintf (p, ">%d", off_x);
1712 sprintf (p, "<%d", -off_x);
1714 p[0] = vallign[COMBINING_CODE_ADD_Y (code)];
1715 p[1] = hallign[COMBINING_CODE_ADD_X (code)];
1721 run_command (int depth, int id, int from, int to, FontLayoutContext *ctx)
1729 /* Direct code (== ctx->code_offset + id) output.
1730 The source is not consumed. */
1731 if (MDEBUG_FLAG () > 2)
1732 MDEBUG_PRINT3 ("\n [FLT] %*s(DIRECT 0x%X", depth, "",
1733 ctx->code_offset + id);
1734 i = (from < to || from == 0) ? from : from - 1;
1736 g = GREF (ctx->out, ctx->out->used - 1);
1737 g->code = ctx->code_offset + id;
1739 SET_MEASURED (g, 0);
1740 if (ctx->combining_code)
1741 SET_COMBINING_CODE (g, ctx, ctx->combining_code);
1742 if (ctx->left_padding)
1743 SET_LEFT_PADDING (g, ctx, LeftPaddingMask);
1744 for (i = from; i < to; i++)
1746 MFLTGlyph *tmp = GREF (ctx->in, i);
1748 if (g->from > tmp->from)
1749 g->from = tmp->from;
1750 else if (g->to < tmp->to)
1753 UPDATE_CLUSTER_RANGE (ctx, g);
1754 ctx->code_offset = ctx->combining_code = ctx->left_padding = 0;
1755 if (MDEBUG_FLAG () > 2)
1760 if (id <= CMD_ID_OFFSET_INDEX)
1762 int idx = CMD_ID_TO_INDEX (id);
1765 if (idx >= ctx->stage->used)
1766 MERROR (MERROR_DRAW, -1);
1767 cmd = ctx->stage->cmds + idx;
1768 if (cmd->type == FontLayoutCmdTypeRule)
1769 to = run_rule (depth, &cmd->body.rule, from, to, ctx);
1770 else if (cmd->type == FontLayoutCmdTypeCond)
1771 to = run_cond (depth, &cmd->body.cond, from, to, ctx);
1772 else if (cmd->type == FontLayoutCmdTypeOTF)
1773 to = run_otf (depth, &cmd->body.otf, from, to, ctx);
1777 if (id <= CMD_ID_OFFSET_COMBINING)
1779 ctx->combining_code = CMD_ID_TO_COMBINING_CODE (id);
1780 if (MDEBUG_FLAG () > 2)
1781 MDEBUG_PRINT3 ("\n [FLT] %*s(CMB %s)", depth, "",
1782 dump_combining_code (ctx->combining_code));
1793 g = GREF (ctx->out, ctx->out->used - 1);
1794 if (ctx->combining_code)
1795 SET_COMBINING_CODE (g, ctx, ctx->combining_code);
1796 if (ctx->left_padding)
1797 SET_LEFT_PADDING (g, ctx, LeftPaddingMask);
1798 UPDATE_CLUSTER_RANGE (ctx, g);
1799 if (MDEBUG_FLAG () > 2)
1802 MDEBUG_PRINT2 ("\n [FLT] %*s(COPY |)", depth, "");
1804 MDEBUG_PRINT3 ("\n [FLT] %*s(COPY 0x%X)", depth, "", g->code);
1806 ctx->code_offset = ctx->combining_code = ctx->left_padding = 0;
1810 case CMD_ID_CLUSTER_BEGIN:
1811 if (ctx->cluster_begin_idx < 0)
1813 if (MDEBUG_FLAG () > 2)
1814 MDEBUG_PRINT3 ("\n [FLT] %*s<%d", depth, "",
1815 GREF (ctx->in, from)->from);
1816 ctx->cluster_begin_idx = ctx->out->used;
1817 ctx->cluster_begin_pos = GREF (ctx->in, from)->from;
1818 ctx->cluster_end_pos = GREF (ctx->in, from)->to;
1822 case CMD_ID_CLUSTER_END:
1823 if (ctx->cluster_begin_idx >= 0
1824 && ctx->cluster_begin_idx < ctx->out->used)
1828 if (MDEBUG_FLAG () > 2)
1829 MDEBUG_PRINT1 (" %d>", ctx->cluster_end_pos + 1);
1830 for (i = ctx->cluster_begin_idx; i < ctx->out->used; i++)
1832 GREF (ctx->out, i)->from = ctx->cluster_begin_pos;
1833 GREF (ctx->out, i)->to = ctx->cluster_end_pos;
1835 ctx->cluster_begin_idx = -1;
1839 case CMD_ID_SEPARATOR:
1843 i = from < to ? from : from - 1;
1845 g = GREF (ctx->out, ctx->out->used - 1);
1846 g->c = -1, g->code = 0;
1847 g->xadv = g->yadv = 0;
1849 SET_MEASURED (g, 0);
1853 case CMD_ID_LEFT_PADDING:
1854 if (MDEBUG_FLAG () > 2)
1855 MDEBUG_PRINT2 ("\n [FLT] %*s[", depth, "");
1856 ctx->left_padding = 1;
1859 case CMD_ID_RIGHT_PADDING:
1860 if (ctx->out->used > 0)
1862 if (MDEBUG_FLAG () > 2)
1863 MDEBUG_PRINT2 ("\n [FLT] %*s]", depth, "");
1864 g = GREF (ctx->out, ctx->out->used - 1);
1865 SET_RIGHT_PADDING (g, ctx, RightPaddingMask);
1870 MERROR (MERROR_DRAW, -1);
1874 run_stages (MFLTGlyphString *gstring, int from, int to,
1875 MFLT *flt, FontLayoutContext *ctx)
1877 MFLTGlyphString buf, *temp;
1879 int orig_from = from, orig_to = to;
1880 int from_pos, to_pos, len;
1883 MPlist *stages = flt->stages;
1885 from_pos = GREF (ctx->in, from)->from;
1886 to_pos = GREF (ctx->in, to - 1)->to;
1887 len = to_pos - from_pos;
1891 GINIT (ctx->out, ctx->out->allocated);
1892 ctx->encoded = alloca (ctx->out->allocated);
1893 if (! ctx->out->glyphs || ! ctx->encoded)
1896 for (stage_idx = 0; 1; stage_idx++)
1901 ctx->stage = (FontLayoutStage *) MPLIST_VAL (stages);
1902 table = ctx->stage->category;
1903 ctx->code_offset = ctx->combining_code = ctx->left_padding = 0;
1904 for (i = from; i < to; i++)
1906 MFLTGlyph *g = GREF (ctx->in, i);
1907 char enc = (GET_ENCODED (g)
1908 ? (g->c > 0 ? (int) mchartable_lookup (table, g->c) : 1)
1910 ? (int) mchartable_lookup (table, g->code)
1913 ctx->encoded[i] = enc;
1914 if (! enc && stage_idx == 0)
1920 ctx->encoded[i] = '\0';
1921 ctx->match_indices[0] = from;
1922 ctx->match_indices[1] = to;
1923 for (i = 2; i < NMATCH; i++)
1924 ctx->match_indices[i] = -1;
1926 if (MDEBUG_FLAG () > 2)
1928 MDEBUG_PRINT2 ("\n [FLT] (STAGE %d \"%s\"", stage_idx,
1929 ctx->encoded + from);
1930 MDEBUG_PRINT (" (");
1931 for (i = from; i < to; i++)
1933 g = GREF (ctx->in, i);
1935 MDEBUG_PRINT2 ("%*s|", (i > 0), "");
1937 MDEBUG_PRINT3 ("%*s%04X", (i > 0), "", GREF (ctx->in, i)->code);
1941 result = run_command (4, INDEX_TO_CMD_ID (0), from, to, ctx);
1942 if (MDEBUG_FLAG () > 2)
1947 stages = MPLIST_NEXT (stages);
1948 /* If this is the last stage, break the loop. */
1949 if (MPLIST_TAIL_P (stages))
1952 /* Otherwise, prepare for the next stage. */
1959 GINIT (&buf, ctx->out->allocated);
1968 if (ctx->out->used > 0)
1971 int x_ppem = ctx->font->x_ppem << 6, y_ppem = ctx->font->y_ppem << 6;
1973 /* Remove separator glyphs. */
1974 for (i = 0; i < ctx->out->used;)
1976 g = GREF (ctx->out, i);
1978 GREPLACE (NULL, 0, 0, ctx->out, i, i + 1);
1983 /* Get actual glyph IDs of glyphs. */
1984 ctx->font->get_glyph_id (ctx->font, ctx->out, 0, ctx->out->used);
1986 /* Check if all characters in the range are covered by some
1987 glyph(s). If not, change <from> and <to> of glyphs to cover
1988 uncovered characters. */
1989 g_indices = alloca (sizeof (int) * len);
1992 for (i = 0; i < len; i++) g_indices[i] = -1;
1993 for (i = 0; i < ctx->out->used; i++)
1997 g = GREF (ctx->out, i);
1998 for (pos = g->from; pos <= g->to; pos++)
1999 if (g_indices[pos - orig_from] < 0)
2000 g_indices[pos - orig_from] = i;
2002 for (i = 0; i < len; i++)
2003 if (g_indices[i] < 0)
2009 for (i++; i < len && g_indices[i] < 0; i++);
2011 g = GREF (ctx->out, j);
2012 this_from = g->from;
2014 g->from = orig_from + i;
2015 } while (++j < ctx->out->used
2016 && (g = GREF (ctx->out, j))
2017 && g->from == this_from);
2023 j = g_indices[i - 1];
2024 g = GREF (ctx->out, j);
2027 g->to = orig_from + i + 1;
2029 && (g = GREF (ctx->out, j))
2030 && g->to == this_to);
2034 ctx->font->get_metrics (ctx->font, ctx->out, 0, ctx->out->used);
2036 /* Handle combining. */
2037 if (ctx->check_mask & CombiningCodeMask)
2039 MFLTGlyph *base = GREF (ctx->out, 0);
2040 int base_height = base->ascent + base->descent;
2043 for (i = 1; i < ctx->out->used; i++)
2045 if ((g = GREF (ctx->out, i))
2046 && (combining_code = GET_COMBINING_CODE (g)))
2048 int height = g->ascent + g->descent;
2049 int base_x, base_y, add_x, add_y, off_x, off_y;
2051 if (base->from > g->from)
2052 base->from = g->from;
2053 else if (base->to < g->to)
2056 base_x = COMBINING_CODE_BASE_X (combining_code);
2057 base_y = COMBINING_CODE_BASE_Y (combining_code);
2058 add_x = COMBINING_CODE_ADD_X (combining_code);
2059 add_y = COMBINING_CODE_ADD_Y (combining_code);
2060 off_x = COMBINING_CODE_OFF_X (combining_code);
2061 off_y = COMBINING_CODE_OFF_Y (combining_code);
2063 g->xoff = ((base->xadv * base_x - g->xadv * add_x) / 2
2064 + x_ppem * off_x / 100 - base->xadv);
2066 g->yoff = base_height * base_y / 2 - base->ascent;
2070 g->yoff -= height * add_y / 2 - g->ascent;
2071 g->yoff -= y_ppem * off_y / 100;
2072 if (base->lbearing > base->xadv + g->lbearing + g->xoff)
2073 base->lbearing = base->xadv + g->lbearing + g->xoff;
2074 if (base->rbearing < base->xadv + g->xadv + g->xoff)
2075 base->rbearing = base->xadv + g->xadv + g->xoff;
2076 if (base->ascent < g->ascent - g->yoff)
2077 base->ascent = g->ascent - g->yoff;
2078 if (base->descent < g->descent - g->yoff)
2079 base->descent = g->descent - g->yoff;
2080 g->xadv = g->yadv = 0;
2081 if (GET_RIGHT_PADDING (g))
2082 SET_RIGHT_PADDING (base, ctx, RightPaddingMask);
2088 base_height = g->ascent + g->descent;
2093 /* Handle padding */
2094 if (ctx->check_mask & (LeftPaddingMask | RightPaddingMask))
2095 for (i = 0; i < ctx->out->used; i++)
2097 g = GREF (ctx->out, i);
2098 if (! GET_COMBINING_CODE (g))
2100 if (GET_RIGHT_PADDING (g) && g->rbearing > g->xadv)
2102 g->xadv = g->rbearing;
2105 if (GET_LEFT_PADDING (g) && g->lbearing < 0)
2107 g->xoff += - g->lbearing;
2108 g->xadv += - g->lbearing;
2109 g->rbearing += - g->lbearing;
2117 GREPLACE (ctx->out, 0, ctx->out->used, gstring, orig_from, orig_to);
2118 to = orig_from + ctx->out->used;
2123 setup_combining_coverage (int from, int to, void *val, void *arg)
2125 int combining_class = (int) val;
2128 if (combining_class < 200)
2130 else if (combining_class <= 204)
2132 if ((combining_class % 2) == 0)
2133 category = "bcd"[(combining_class - 200) / 2];
2135 else if (combining_class <= 232)
2137 if ((combining_class % 2) == 0)
2138 category = "efghijklmnopq"[(combining_class - 208) / 2];
2140 else if (combining_class == 233)
2142 else if (combining_class == 234)
2144 else if (combining_class == 240)
2146 mchartable_set_range ((MCharTable *) arg, from, to, (void *) category);
2150 setup_combining_flt (MFLT *flt)
2153 MCharTable *combininig_class_table
2154 = mchar_get_prop_table (Mcombining_class, &type);
2156 mchartable_set_range (flt->coverage, 0, 0x10FFFF, (void *) 'u');
2157 if (combininig_class_table)
2158 mchartable_map (combininig_class_table, (void *) 0,
2159 setup_combining_coverage, flt->coverage);
2162 #define CHECK_FLT_STAGES(flt) ((flt)->stages || load_flt (flt, NULL) == 0)
2167 int m17n__flt_initialized;
2172 /* The following two are actually not exposed to a user but concealed
2173 by the macro M17N_INIT (). */
2176 m17n_init_flt (void)
2178 int mdebug_flag = MDEBUG_INIT;
2180 merror_code = MERROR_NONE;
2181 if (m17n__flt_initialized++)
2184 if (merror_code != MERROR_NONE)
2186 m17n__flt_initialized--;
2190 MDEBUG_PUSH_TIME ();
2192 Mcond = msymbol ("cond");
2193 Mrange = msymbol ("range");
2194 Mfont = msymbol ("font");
2195 Mlayouter = msymbol ("layouter");
2196 Mcombining = msymbol ("combining");
2197 Mfont_facility = msymbol ("font-facility");
2198 Mgenerator = msymbol ("generator");
2199 Mend = msymbol ("end");
2201 MDEBUG_PRINT_TIME ("INIT", (stderr, " to initialize the flt modules."));
2206 m17n_fini_flt (void)
2208 int mdebug_flag = MDEBUG_FINI;
2210 if (m17n__flt_initialized == 0
2211 || --m17n__flt_initialized > 0)
2214 MDEBUG_PUSH_TIME ();
2216 MDEBUG_PRINT_TIME ("FINI", (stderr, " to finalize the flt modules."));
2222 #endif /* !FOR_DOXYGEN || DOXYGEN_INTERNAL_MODULE */
2224 /*** @addtogroup m17nFLT */
2230 @brief Return a FLT object whose name is NAME.
2232 The mflt_get () function returns a FLT object whose name is $NAME.
2235 If the operation was successfully, mflt_get () returns a pointer
2236 to a FLT object. Otherwise, it returns @c NULL. */
2239 mflt_get (MSymbol name)
2243 if (! flt_list && list_flt () < 0)
2245 flt = mplist_get (flt_list, name);
2246 if (! flt || ! CHECK_FLT_STAGES (flt))
2248 if (flt->name == Mcombining
2249 && ! mchartable_lookup (flt->coverage, 0))
2250 setup_combining_flt (flt);
2257 @brief Find a FLT suitable for a specified character and font.
2259 The mflt_find () function returns the most appropriate FLT for
2260 rendering the character $C by font $FONT.
2263 If the operation was successfully, mflt_find () returns a pointer
2264 to a FLT object. Otherwise, it returns @c NULL. */
2267 mflt_find (int c, MFLTFont *font)
2271 static MSymbol unicode_bmp = NULL, unicode_full = NULL;
2275 unicode_bmp = msymbol ("unicode-bmp");
2276 unicode_full = msymbol ("unicode-full");
2279 if (! flt_list && list_flt () < 0)
2285 MPLIST_DO (plist, flt_list)
2287 flt = MPLIST_VAL (plist);
2288 if (flt->registry != unicode_bmp
2289 && flt->registry != unicode_full)
2291 if (flt->family && flt->family != font->family)
2294 && ! mchartable_lookup (flt->coverage, c))
2298 MFLTOtfSpec *spec = &flt->otf;
2300 if (! font->check_otf)
2302 if ((spec->features[0] && spec->features[0][0] != 0xFFFFFFFF)
2303 || (spec->features[1] && spec->features[1][0] != 0xFFFFFFFF))
2306 else if (! font->check_otf (font, spec))
2316 MPLIST_DO (plist, flt_list)
2318 flt = MPLIST_VAL (plist);
2319 if (mchartable_lookup (flt->coverage, c))
2328 @brief Return a name of a FLT.
2330 The mflt_name () function returns the name of $FLT. */
2333 mflt_name (MFLT *flt)
2335 return MSYMBOL_NAME (flt->name);
2340 @brief Return a coverage of a FLT.
2342 The mflt_coverage () function returns a char-table that contains
2343 nonzero value for characters supported by $FLT. */
2346 mflt_coverage (MFLT *flt)
2348 return flt->coverage;
2353 @brief Layout characters by Font Layout Table.
2355 The mflt_run () function layout characters in $GSTRING between
2356 $FROM (inclusive) and $TO (exclusive) by $FONT. If $FLT is
2357 nonzero, it is used for all the charaters. Otherwise, appropriate
2358 FLTs are automatically chosen.
2361 The operation was successful. The value is an index to the
2362 $GSTRING->glyphs which was previously indexed by $TO.
2365 $GSTRING->glyphs is too short to store the result. A caller can
2366 call this fucntion again with the larger $GSTRING->glyphs.
2369 Some other error occurred. */
2372 mflt_run (MFLTGlyphString *gstring, int from, int to,
2373 MFLTFont *font, MFLT *flt)
2375 FontLayoutContext ctx;
2376 int match_indices[NMATCH];
2378 MFLTGlyphString out;
2379 int auto_flt = ! flt;
2381 int this_from, this_to;
2385 /* This is usually sufficient, but if not, we retry with the larger
2386 values at most 3 times. This value is also used for the
2387 allocating size of ctx.encoded. */
2388 out.allocated = (to - from) * 4;
2390 for (i = from; i < to; i++)
2392 g = GREF (gstring, i);
2394 memset (g, 0, sizeof (MFLTGlyph));
2396 g->from = g->to = i;
2399 for (this_from = from; this_from < to;)
2403 for (this_to = this_from; this_to < to; this_to++)
2404 if (mchartable_lookup (flt->coverage, GREF (gstring, this_to)->c))
2409 if (! flt_list && list_flt () < 0)
2411 font->get_glyph_id (font, gstring, this_from, to);
2412 font->get_metrics (font, gstring, this_from, to);
2416 for (this_to = this_from; this_to < to; this_to++)
2418 c = GREF (gstring, this_to)->c;
2419 if (c >= flt_min_coverage && c <= flt_max_coverage)
2422 for (; this_to < to; this_to++)
2424 c = GREF (gstring, this_to)->c;
2426 && mchartable_lookup (((MFLT *) font->internal)->coverage, c))
2428 flt = font->internal;
2431 flt = mflt_find (c, font);
2434 if (CHECK_FLT_STAGES (flt))
2436 font->internal = flt;
2443 if (this_from < this_to)
2445 font->get_glyph_id (font, gstring, this_from, this_to);
2446 font->get_metrics (font, gstring, this_from, this_to);
2447 this_from = this_to;
2452 MDEBUG_PRINT1 (" [FLT] (%s", MSYMBOL_NAME (flt->name));
2454 for (; this_to < to; this_to++)
2455 if (! mchartable_lookup (flt->coverage, GREF (gstring, this_to)->c))
2461 MDEBUG_PRINT1 (" (%s)", MSYMBOL_NAME (font->family));
2462 MDEBUG_PRINT ("\n [FLT] (SOURCE");
2463 for (i = this_from, j = 0; i < this_to; i++, j++)
2465 if (j > 0 && j % 8 == 0)
2466 MDEBUG_PRINT ("\n [FLT] ");
2467 MDEBUG_PRINT1 (" %04X", GREF (gstring, i)->c);
2472 for (i = 0; i < 3; i++)
2475 memset (&ctx, 0, sizeof ctx);
2476 ctx.match_indices = match_indices;
2478 ctx.cluster_begin_idx = -1;
2481 j = run_stages (gstring, this_from, this_to, flt, &ctx);
2495 MDEBUG_PRINT ("\n [FLT] (RESULT");
2496 if (MDEBUG_FLAG () > 1)
2497 for (i = 0; this_from < this_to; this_from++, i++)
2499 if (i > 0 && i % 4 == 0)
2500 MDEBUG_PRINT ("\n [FLT] ");
2501 g = GREF (gstring, this_from);
2502 MDEBUG_PRINT4 (" (%04X %d %d %d)",
2503 g->code, g->xadv, g->xoff, g->yoff);
2506 for (; this_from < this_to; this_from++)
2507 MDEBUG_PRINT1 (" %04X", GREF (gstring, this_from)->code);
2508 MDEBUG_PRINT ("))\n");
2510 this_from = this_to;
2515 int len = to - from;
2518 memcpy (((char *) out.glyphs),
2519 ((char *) gstring->glyphs) + gstring->glyph_size * from,
2520 gstring->glyph_size * len);
2521 for (i = from, j = to; i < to;)
2523 for (k = i + 1, j--; k < to && GREF (&out, k)->xadv == 0;
2525 GCPY (&out, i, (k - i), gstring, j);
2534 /* for debugging... */
2537 dump_flt_cmd (FontLayoutStage *stage, int id, int indent)
2539 char *prefix = (char *) alloca (indent + 1);
2541 memset (prefix, 32, indent);
2545 fprintf (stderr, "0x%02X", id);
2546 else if (id <= CMD_ID_OFFSET_INDEX)
2548 int idx = CMD_ID_TO_INDEX (id);
2549 FontLayoutCmd *cmd = stage->cmds + idx;
2551 if (cmd->type == FontLayoutCmdTypeRule)
2553 FontLayoutCmdRule *rule = &cmd->body.rule;
2556 fprintf (stderr, "(rule ");
2557 if (rule->src_type == SRC_REGEX)
2558 fprintf (stderr, "\"%s\"", rule->src.re.pattern);
2559 else if (rule->src_type == SRC_INDEX)
2560 fprintf (stderr, "%d", rule->src.match_idx);
2561 else if (rule->src_type == SRC_SEQ)
2562 fprintf (stderr, "(seq)");
2563 else if (rule->src_type == SRC_RANGE)
2564 fprintf (stderr, "(range)");
2566 fprintf (stderr, "(invalid src)");
2568 for (i = 0; i < rule->n_cmds; i++)
2570 fprintf (stderr, "\n%s ", prefix);
2571 dump_flt_cmd (stage, rule->cmd_ids[i], indent + 2);
2573 fprintf (stderr, ")");
2575 else if (cmd->type == FontLayoutCmdTypeCond)
2577 FontLayoutCmdCond *cond = &cmd->body.cond;
2580 fprintf (stderr, "(cond");
2581 for (i = 0; i < cond->n_cmds; i++)
2583 fprintf (stderr, "\n%s ", prefix);
2584 dump_flt_cmd (stage, cond->cmd_ids[i], indent + 2);
2586 fprintf (stderr, ")");
2588 else if (cmd->type == FontLayoutCmdTypeOTF)
2590 fprintf (stderr, "(otf)");
2593 fprintf (stderr, "(error-command)");
2595 else if (id <= CMD_ID_OFFSET_COMBINING)
2596 fprintf (stderr, "cominging-code");
2598 fprintf (stderr, "(predefiend %d)", id);
2602 mdebug_dump_flt (MFLT *flt, int indent)
2604 char *prefix = (char *) alloca (indent + 1);
2608 memset (prefix, 32, indent);
2610 fprintf (stderr, "(flt");
2611 MPLIST_DO (plist, flt->stages)
2613 FontLayoutStage *stage = (FontLayoutStage *) MPLIST_VAL (plist);
2616 fprintf (stderr, "\n%s (stage %d", prefix, stage_idx);
2617 for (i = 0; i < stage->used; i++)
2619 fprintf (stderr, "\n%s ", prefix);
2620 dump_flt_cmd (stage, INDEX_TO_CMD_ID (i), indent + 4);
2622 fprintf (stderr, ")");
2625 fprintf (stderr, ")");