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 (i = 0, g = GREF (ctx->out, from_idx + i), a = adjustment;
1640 i < out_len; i++, a++, g = NEXT (ctx->out, g))
1642 SET_MEASURED (g, 1);
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;
1676 if (ctx->cluster_begin_idx >= 0)
1677 for (; from_idx < ctx->out->used; from_idx++)
1679 MFLTGlyph *g = GREF (ctx->out, from_idx);
1680 UPDATE_CLUSTER_RANGE (ctx, g);
1685 static char work[16];
1688 dump_combining_code (int code)
1690 char *vallign = "tcbB";
1691 char *hallign = "lcr";
1697 work[0] = vallign[COMBINING_CODE_BASE_Y (code)];
1698 work[1] = hallign[COMBINING_CODE_BASE_X (code)];
1699 off_y = COMBINING_CODE_OFF_Y (code);
1700 off_x = COMBINING_CODE_OFF_X (code);
1702 sprintf (work + 2, "+%d", off_y);
1704 sprintf (work + 2, "%d", off_y);
1705 else if (off_x == 0)
1706 sprintf (work + 2, ".");
1707 p = work + strlen (work);
1709 sprintf (p, ">%d", off_x);
1711 sprintf (p, "<%d", -off_x);
1713 p[0] = vallign[COMBINING_CODE_ADD_Y (code)];
1714 p[1] = hallign[COMBINING_CODE_ADD_X (code)];
1720 run_command (int depth, int id, int from, int to, FontLayoutContext *ctx)
1728 /* Direct code (== ctx->code_offset + id) output.
1729 The source is not consumed. */
1730 if (MDEBUG_FLAG () > 2)
1731 MDEBUG_PRINT3 ("\n [FLT] %*s(DIRECT 0x%X", depth, "",
1732 ctx->code_offset + id);
1733 i = (from < to || from == 0) ? from : from - 1;
1735 g = GREF (ctx->out, ctx->out->used - 1);
1736 g->code = ctx->code_offset + id;
1738 SET_MEASURED (g, 0);
1739 if (ctx->combining_code)
1740 SET_COMBINING_CODE (g, ctx, ctx->combining_code);
1741 if (ctx->left_padding)
1742 SET_LEFT_PADDING (g, ctx, LeftPaddingMask);
1743 for (i = from; i < to; i++)
1745 MFLTGlyph *tmp = GREF (ctx->in, i);
1747 if (g->from > tmp->from)
1748 g->from = tmp->from;
1749 else if (g->to < tmp->to)
1752 UPDATE_CLUSTER_RANGE (ctx, g);
1753 ctx->code_offset = ctx->combining_code = ctx->left_padding = 0;
1754 if (MDEBUG_FLAG () > 2)
1759 if (id <= CMD_ID_OFFSET_INDEX)
1761 int idx = CMD_ID_TO_INDEX (id);
1764 if (idx >= ctx->stage->used)
1765 MERROR (MERROR_DRAW, -1);
1766 cmd = ctx->stage->cmds + idx;
1767 if (cmd->type == FontLayoutCmdTypeRule)
1768 to = run_rule (depth, &cmd->body.rule, from, to, ctx);
1769 else if (cmd->type == FontLayoutCmdTypeCond)
1770 to = run_cond (depth, &cmd->body.cond, from, to, ctx);
1771 else if (cmd->type == FontLayoutCmdTypeOTF)
1772 to = run_otf (depth, &cmd->body.otf, from, to, ctx);
1776 if (id <= CMD_ID_OFFSET_COMBINING)
1778 ctx->combining_code = CMD_ID_TO_COMBINING_CODE (id);
1779 if (MDEBUG_FLAG () > 2)
1780 MDEBUG_PRINT3 ("\n [FLT] %*s(CMB %s)", depth, "",
1781 dump_combining_code (ctx->combining_code));
1792 g = GREF (ctx->out, ctx->out->used - 1);
1793 if (ctx->combining_code)
1794 SET_COMBINING_CODE (g, ctx, ctx->combining_code);
1795 if (ctx->left_padding)
1796 SET_LEFT_PADDING (g, ctx, LeftPaddingMask);
1797 UPDATE_CLUSTER_RANGE (ctx, g);
1798 if (MDEBUG_FLAG () > 2)
1801 MDEBUG_PRINT2 ("\n [FLT] %*s(COPY |)", depth, "");
1803 MDEBUG_PRINT3 ("\n [FLT] %*s(COPY 0x%X)", depth, "", g->code);
1805 ctx->code_offset = ctx->combining_code = ctx->left_padding = 0;
1809 case CMD_ID_CLUSTER_BEGIN:
1810 if (ctx->cluster_begin_idx < 0)
1812 if (MDEBUG_FLAG () > 2)
1813 MDEBUG_PRINT3 ("\n [FLT] %*s<%d", depth, "",
1814 GREF (ctx->in, from)->from);
1815 ctx->cluster_begin_idx = ctx->out->used;
1816 ctx->cluster_begin_pos = GREF (ctx->in, from)->from;
1817 ctx->cluster_end_pos = GREF (ctx->in, from)->to;
1821 case CMD_ID_CLUSTER_END:
1822 if (ctx->cluster_begin_idx >= 0
1823 && ctx->cluster_begin_idx < ctx->out->used)
1827 if (MDEBUG_FLAG () > 2)
1828 MDEBUG_PRINT1 (" %d>", ctx->cluster_end_pos + 1);
1829 for (i = ctx->cluster_begin_idx; i < ctx->out->used; i++)
1831 GREF (ctx->out, i)->from = ctx->cluster_begin_pos;
1832 GREF (ctx->out, i)->to = ctx->cluster_end_pos;
1834 ctx->cluster_begin_idx = -1;
1838 case CMD_ID_SEPARATOR:
1842 i = from < to ? from : from - 1;
1844 g = GREF (ctx->out, ctx->out->used - 1);
1845 g->c = -1, g->code = 0;
1846 g->xadv = g->yadv = 0;
1848 SET_MEASURED (g, 0);
1852 case CMD_ID_LEFT_PADDING:
1853 if (MDEBUG_FLAG () > 2)
1854 MDEBUG_PRINT2 ("\n [FLT] %*s[", depth, "");
1855 ctx->left_padding = 1;
1858 case CMD_ID_RIGHT_PADDING:
1859 if (ctx->out->used > 0)
1861 if (MDEBUG_FLAG () > 2)
1862 MDEBUG_PRINT2 ("\n [FLT] %*s]", depth, "");
1863 g = GREF (ctx->out, ctx->out->used - 1);
1864 SET_RIGHT_PADDING (g, ctx, RightPaddingMask);
1869 MERROR (MERROR_DRAW, -1);
1873 run_stages (MFLTGlyphString *gstring, int from, int to,
1874 MFLT *flt, FontLayoutContext *ctx)
1876 MFLTGlyphString buf, *temp;
1878 int orig_from = from, orig_to = to;
1879 int from_pos, to_pos, len;
1882 MPlist *stages = flt->stages;
1884 from_pos = GREF (ctx->in, from)->from;
1885 to_pos = GREF (ctx->in, to - 1)->to;
1886 len = to_pos - from_pos;
1890 GINIT (ctx->out, ctx->out->allocated);
1891 ctx->encoded = alloca (ctx->out->allocated);
1892 if (! ctx->out->glyphs || ! ctx->encoded)
1895 for (stage_idx = 0; 1; stage_idx++)
1900 ctx->stage = (FontLayoutStage *) MPLIST_VAL (stages);
1901 table = ctx->stage->category;
1902 ctx->code_offset = ctx->combining_code = ctx->left_padding = 0;
1903 for (i = from; i < to; i++)
1905 MFLTGlyph *g = GREF (ctx->in, i);
1906 char enc = (GET_ENCODED (g)
1907 ? (g->c > 0 ? (int) mchartable_lookup (table, g->c) : 1)
1909 ? (int) mchartable_lookup (table, g->code)
1912 ctx->encoded[i] = enc;
1913 if (! enc && stage_idx == 0)
1919 ctx->encoded[i] = '\0';
1920 ctx->match_indices[0] = from;
1921 ctx->match_indices[1] = to;
1922 for (i = 2; i < NMATCH; i++)
1923 ctx->match_indices[i] = -1;
1925 if (MDEBUG_FLAG () > 2)
1927 MDEBUG_PRINT2 ("\n [FLT] (STAGE %d \"%s\"", stage_idx,
1928 ctx->encoded + from);
1929 MDEBUG_PRINT (" (");
1930 for (i = from; i < to; i++)
1932 g = GREF (ctx->in, i);
1934 MDEBUG_PRINT2 ("%*s|", (i > 0), "");
1936 MDEBUG_PRINT3 ("%*s%04X", (i > 0), "", GREF (ctx->in, i)->code);
1940 result = run_command (4, INDEX_TO_CMD_ID (0), from, to, ctx);
1941 if (MDEBUG_FLAG () > 2)
1946 stages = MPLIST_NEXT (stages);
1947 /* If this is the last stage, break the loop. */
1948 if (MPLIST_TAIL_P (stages))
1951 /* Otherwise, prepare for the next stage. */
1958 GINIT (&buf, ctx->out->allocated);
1967 if (ctx->out->used > 0)
1970 int x_ppem = ctx->font->x_ppem << 6, y_ppem = ctx->font->y_ppem << 6;
1972 /* Remove separator glyphs. */
1973 for (i = 0; i < ctx->out->used;)
1975 g = GREF (ctx->out, i);
1977 GREPLACE (NULL, 0, 0, ctx->out, i, i + 1);
1982 /* Get actual glyph IDs of glyphs. */
1983 ctx->font->get_glyph_id (ctx->font, ctx->out, 0, ctx->out->used);
1985 /* Check if all characters in the range are covered by some
1986 glyph(s). If not, change <from> and <to> of glyphs to cover
1987 uncovered characters. */
1988 g_indices = alloca (sizeof (int) * len);
1991 for (i = 0; i < len; i++) g_indices[i] = -1;
1992 for (i = 0; i < ctx->out->used; i++)
1996 g = GREF (ctx->out, i);
1997 for (pos = g->from; pos <= g->to; pos++)
1998 if (g_indices[pos - orig_from] < 0)
1999 g_indices[pos - orig_from] = i;
2001 for (i = 0; i < len; i++)
2002 if (g_indices[i] < 0)
2008 for (i++; i < len && g_indices[i] < 0; i++);
2010 g = GREF (ctx->out, j);
2011 this_from = g->from;
2013 g->from = orig_from + i;
2014 } while (++j < ctx->out->used
2015 && (g = GREF (ctx->out, j))
2016 && g->from == this_from);
2022 j = g_indices[i - 1];
2023 g = GREF (ctx->out, j);
2026 g->to = orig_from + i + 1;
2028 && (g = GREF (ctx->out, j))
2029 && g->to == this_to);
2033 ctx->font->get_metrics (ctx->font, ctx->out, 0, ctx->out->used);
2035 /* Handle combining. */
2036 if (ctx->check_mask & CombiningCodeMask)
2038 MFLTGlyph *base = GREF (ctx->out, 0);
2039 int base_height = base->ascent + base->descent;
2042 for (i = 1; i < ctx->out->used; i++)
2044 if ((g = GREF (ctx->out, i))
2045 && (combining_code = GET_COMBINING_CODE (g)))
2047 int height = g->ascent + g->descent;
2048 int base_x, base_y, add_x, add_y, off_x, off_y;
2050 if (base->from > g->from)
2051 base->from = g->from;
2052 else if (base->to < g->to)
2055 base_x = COMBINING_CODE_BASE_X (combining_code);
2056 base_y = COMBINING_CODE_BASE_Y (combining_code);
2057 add_x = COMBINING_CODE_ADD_X (combining_code);
2058 add_y = COMBINING_CODE_ADD_Y (combining_code);
2059 off_x = COMBINING_CODE_OFF_X (combining_code);
2060 off_y = COMBINING_CODE_OFF_Y (combining_code);
2062 g->xoff = ((base->xadv * base_x - g->xadv * add_x) / 2
2063 + x_ppem * off_x / 100 - base->xadv);
2065 g->yoff = base_height * base_y / 2 - base->ascent;
2069 g->yoff -= height * add_y / 2 - g->ascent;
2070 g->yoff -= y_ppem * off_y / 100;
2071 if (base->lbearing > base->xadv + g->lbearing + g->xoff)
2072 base->lbearing = base->xadv + g->lbearing + g->xoff;
2073 if (base->rbearing < base->xadv + g->xadv + g->xoff)
2074 base->rbearing = base->xadv + g->xadv + g->xoff;
2075 if (base->ascent < g->ascent - g->yoff)
2076 base->ascent = g->ascent - g->yoff;
2077 if (base->descent < g->descent - g->yoff)
2078 base->descent = g->descent - g->yoff;
2079 g->xadv = g->yadv = 0;
2080 if (GET_RIGHT_PADDING (g))
2081 SET_RIGHT_PADDING (base, ctx, RightPaddingMask);
2086 base_height = g->ascent + g->descent;
2091 /* Handle padding */
2092 if (ctx->check_mask & (LeftPaddingMask | RightPaddingMask))
2093 for (i = 0; i < ctx->out->used; i++)
2095 g = GREF (ctx->out, i);
2096 if (! GET_COMBINING_CODE (g))
2098 if (GET_RIGHT_PADDING (g) && g->rbearing > g->xadv)
2100 g->xadv = g->rbearing;
2102 if (GET_LEFT_PADDING (g) && g->lbearing < 0)
2104 g->xoff += - g->lbearing;
2105 g->xadv += - g->lbearing;
2106 g->rbearing += - g->lbearing;
2113 GREPLACE (ctx->out, 0, ctx->out->used, gstring, orig_from, orig_to);
2114 to = orig_from + ctx->out->used;
2119 setup_combining_coverage (int from, int to, void *val, void *arg)
2121 int combining_class = (int) val;
2124 if (combining_class < 200)
2126 else if (combining_class <= 204)
2128 if ((combining_class % 2) == 0)
2129 category = "bcd"[(combining_class - 200) / 2];
2131 else if (combining_class <= 232)
2133 if ((combining_class % 2) == 0)
2134 category = "efghijklmnopq"[(combining_class - 208) / 2];
2136 else if (combining_class == 233)
2138 else if (combining_class == 234)
2140 else if (combining_class == 240)
2142 mchartable_set_range ((MCharTable *) arg, from, to, (void *) category);
2146 setup_combining_flt (MFLT *flt)
2149 MCharTable *combininig_class_table
2150 = mchar_get_prop_table (Mcombining_class, &type);
2152 mchartable_set_range (flt->coverage, 0, 0x10FFFF, (void *) 'u');
2153 if (combininig_class_table)
2154 mchartable_map (combininig_class_table, (void *) 0,
2155 setup_combining_coverage, flt->coverage);
2158 #define CHECK_FLT_STAGES(flt) ((flt)->stages || load_flt (flt, NULL) == 0)
2163 int m17n__flt_initialized;
2168 /* The following two are actually not exposed to a user but concealed
2169 by the macro M17N_INIT (). */
2172 m17n_init_flt (void)
2174 int mdebug_flag = MDEBUG_INIT;
2176 merror_code = MERROR_NONE;
2177 if (m17n__flt_initialized++)
2180 if (merror_code != MERROR_NONE)
2182 m17n__flt_initialized--;
2186 MDEBUG_PUSH_TIME ();
2188 Mcond = msymbol ("cond");
2189 Mrange = msymbol ("range");
2190 Mfont = msymbol ("font");
2191 Mlayouter = msymbol ("layouter");
2192 Mcombining = msymbol ("combining");
2193 Mfont_facility = msymbol ("font-facility");
2194 Mgenerator = msymbol ("generator");
2195 Mend = msymbol ("end");
2197 MDEBUG_PRINT_TIME ("INIT", (stderr, " to initialize the flt modules."));
2202 m17n_fini_flt (void)
2204 int mdebug_flag = MDEBUG_FINI;
2206 if (m17n__flt_initialized == 0
2207 || --m17n__flt_initialized > 0)
2210 MDEBUG_PUSH_TIME ();
2212 MDEBUG_PRINT_TIME ("FINI", (stderr, " to finalize the flt modules."));
2218 #endif /* !FOR_DOXYGEN || DOXYGEN_INTERNAL_MODULE */
2220 /*** @addtogroup m17nFLT */
2226 @brief Return a FLT object whose name is NAME.
2228 The mflt_get () function returns a FLT object whose name is $NAME.
2231 If the operation was successfully, mflt_get () returns a pointer
2232 to a FLT object. Otherwise, it returns @c NULL. */
2235 mflt_get (MSymbol name)
2239 if (! flt_list && list_flt () < 0)
2241 flt = mplist_get (flt_list, name);
2242 if (! flt || ! CHECK_FLT_STAGES (flt))
2244 if (flt->name == Mcombining
2245 && ! mchartable_lookup (flt->coverage, 0))
2246 setup_combining_flt (flt);
2253 @brief Find a FLT suitable for a specified character and font.
2255 The mflt_find () function returns the most appropriate FLT for
2256 rendering the character $C by font $FONT.
2259 If the operation was successfully, mflt_find () returns a pointer
2260 to a FLT object. Otherwise, it returns @c NULL. */
2263 mflt_find (int c, MFLTFont *font)
2267 static MSymbol unicode_bmp = NULL, unicode_full = NULL;
2271 unicode_bmp = msymbol ("unicode-bmp");
2272 unicode_full = msymbol ("unicode-full");
2275 if (! flt_list && list_flt () < 0)
2281 MPLIST_DO (plist, flt_list)
2283 flt = MPLIST_VAL (plist);
2284 if (flt->registry != unicode_bmp
2285 && flt->registry != unicode_full)
2287 if (flt->family && flt->family != font->family)
2290 && ! mchartable_lookup (flt->coverage, c))
2294 MFLTOtfSpec *spec = &flt->otf;
2296 if (! font->check_otf)
2298 if ((spec->features[0] && spec->features[0][0] != 0xFFFFFFFF)
2299 || (spec->features[1] && spec->features[1][0] != 0xFFFFFFFF))
2302 else if (! font->check_otf (font, spec))
2312 MPLIST_DO (plist, flt_list)
2314 flt = MPLIST_VAL (plist);
2315 if (mchartable_lookup (flt->coverage, c))
2324 @brief Return a name of a FLT.
2326 The mflt_name () function returns the name of $FLT. */
2329 mflt_name (MFLT *flt)
2331 return MSYMBOL_NAME (flt->name);
2336 @brief Return a coverage of a FLT.
2338 The mflt_coverage () function returns a char-table that contains
2339 nonzero value for characters supported by $FLT. */
2342 mflt_coverage (MFLT *flt)
2344 return flt->coverage;
2349 @brief Layout characters by Font Layout Table.
2351 The mflt_run () function layout characters in $GSTRING between
2352 $FROM (inclusive) and $TO (exclusive) by $FONT. If $FLT is
2353 nonzero, it is used for all the charaters. Otherwise, appropriate
2354 FLTs are automatically chosen.
2357 The operation was successful. The value is an index to the
2358 $GSTRING->glyphs which was previously indexed by $TO.
2361 $GSTRING->glyphs is too short to store the result. A caller can
2362 call this fucntion again with the larger $GSTRING->glyphs.
2365 Some other error occurred. */
2368 mflt_run (MFLTGlyphString *gstring, int from, int to,
2369 MFLTFont *font, MFLT *flt)
2371 FontLayoutContext ctx;
2372 int match_indices[NMATCH];
2374 MFLTGlyphString out;
2375 int auto_flt = ! flt;
2377 int this_from, this_to;
2381 /* This is usually sufficient, but if not, we retry with the larger
2382 values at most 3 times. This value is also used for the
2383 allocating size of ctx.encoded. */
2384 out.allocated = (to - from) * 4;
2386 for (i = from; i < to; i++)
2388 g = GREF (gstring, i);
2390 memset (g, 0, sizeof (MFLTGlyph));
2392 g->from = g->to = i;
2395 for (this_from = from; this_from < to;)
2399 for (this_to = this_from; this_to < to; this_to++)
2400 if (mchartable_lookup (flt->coverage, GREF (gstring, this_to)->c))
2405 if (! flt_list && list_flt () < 0)
2407 font->get_glyph_id (font, gstring, this_from, to);
2408 font->get_metrics (font, gstring, this_from, to);
2412 for (this_to = this_from; this_to < to; this_to++)
2414 c = GREF (gstring, this_to)->c;
2415 if (c >= flt_min_coverage && c <= flt_max_coverage)
2418 for (; this_to < to; this_to++)
2420 c = GREF (gstring, this_to)->c;
2422 && mchartable_lookup (((MFLT *) font->internal)->coverage, c))
2424 flt = font->internal;
2427 flt = mflt_find (c, font);
2430 if (CHECK_FLT_STAGES (flt))
2432 font->internal = flt;
2439 if (this_from < this_to)
2441 font->get_glyph_id (font, gstring, this_from, this_to);
2442 font->get_metrics (font, gstring, this_from, this_to);
2443 this_from = this_to;
2448 MDEBUG_PRINT1 (" [FLT] (%s", MSYMBOL_NAME (flt->name));
2450 for (; this_to < to; this_to++)
2451 if (! mchartable_lookup (flt->coverage, GREF (gstring, this_to)->c))
2457 MDEBUG_PRINT1 (" (%s)", MSYMBOL_NAME (font->family));
2458 MDEBUG_PRINT ("\n [FLT] (SOURCE");
2459 for (i = this_from, j = 0; i < this_to; i++, j++)
2461 if (j > 0 && j % 8 == 0)
2462 MDEBUG_PRINT ("\n [FLT] ");
2463 MDEBUG_PRINT1 (" %04X", GREF (gstring, i)->c);
2468 for (i = 0; i < 3; i++)
2471 memset (&ctx, 0, sizeof ctx);
2472 ctx.match_indices = match_indices;
2474 ctx.cluster_begin_idx = -1;
2477 j = run_stages (gstring, this_from, this_to, flt, &ctx);
2491 MDEBUG_PRINT ("\n [FLT] (RESULT");
2492 if (MDEBUG_FLAG () > 1)
2493 for (i = 0; this_from < this_to; this_from++, i++)
2495 if (i > 0 && i % 4 == 0)
2496 MDEBUG_PRINT ("\n [FLT] ");
2497 g = GREF (gstring, this_from);
2498 MDEBUG_PRINT4 (" (%04X %d %d %d)",
2499 g->code, g->xadv, g->xoff, g->yoff);
2502 for (; this_from < this_to; this_from++)
2503 MDEBUG_PRINT1 (" %04X", GREF (gstring, this_from)->code);
2504 MDEBUG_PRINT ("))\n");
2506 this_from = this_to;
2511 int len = to - from;
2514 memcpy (((char *) out.glyphs),
2515 ((char *) gstring->glyphs) + gstring->glyph_size * from,
2516 gstring->glyph_size * len);
2517 for (i = from, j = to; i < to;)
2519 for (k = i + 1, j--; k < to && GREF (&out, k)->xadv == 0;
2521 GCPY (&out, i, (k - i), gstring, j);
2530 /* for debugging... */
2533 dump_flt_cmd (FontLayoutStage *stage, int id, int indent)
2535 char *prefix = (char *) alloca (indent + 1);
2537 memset (prefix, 32, indent);
2541 fprintf (stderr, "0x%02X", id);
2542 else if (id <= CMD_ID_OFFSET_INDEX)
2544 int idx = CMD_ID_TO_INDEX (id);
2545 FontLayoutCmd *cmd = stage->cmds + idx;
2547 if (cmd->type == FontLayoutCmdTypeRule)
2549 FontLayoutCmdRule *rule = &cmd->body.rule;
2552 fprintf (stderr, "(rule ");
2553 if (rule->src_type == SRC_REGEX)
2554 fprintf (stderr, "\"%s\"", rule->src.re.pattern);
2555 else if (rule->src_type == SRC_INDEX)
2556 fprintf (stderr, "%d", rule->src.match_idx);
2557 else if (rule->src_type == SRC_SEQ)
2558 fprintf (stderr, "(seq)");
2559 else if (rule->src_type == SRC_RANGE)
2560 fprintf (stderr, "(range)");
2562 fprintf (stderr, "(invalid src)");
2564 for (i = 0; i < rule->n_cmds; i++)
2566 fprintf (stderr, "\n%s ", prefix);
2567 dump_flt_cmd (stage, rule->cmd_ids[i], indent + 2);
2569 fprintf (stderr, ")");
2571 else if (cmd->type == FontLayoutCmdTypeCond)
2573 FontLayoutCmdCond *cond = &cmd->body.cond;
2576 fprintf (stderr, "(cond");
2577 for (i = 0; i < cond->n_cmds; i++)
2579 fprintf (stderr, "\n%s ", prefix);
2580 dump_flt_cmd (stage, cond->cmd_ids[i], indent + 2);
2582 fprintf (stderr, ")");
2584 else if (cmd->type == FontLayoutCmdTypeOTF)
2586 fprintf (stderr, "(otf)");
2589 fprintf (stderr, "(error-command)");
2591 else if (id <= CMD_ID_OFFSET_COMBINING)
2592 fprintf (stderr, "cominging-code");
2594 fprintf (stderr, "(predefiend %d)", id);
2598 mdebug_dump_flt (MFLT *flt, int indent)
2600 char *prefix = (char *) alloca (indent + 1);
2604 memset (prefix, 32, indent);
2606 fprintf (stderr, "(flt");
2607 MPLIST_DO (plist, flt->stages)
2609 FontLayoutStage *stage = (FontLayoutStage *) MPLIST_VAL (plist);
2612 fprintf (stderr, "\n%s (stage %d", prefix, stage_idx);
2613 for (i = 0; i < stage->used; i++)
2615 fprintf (stderr, "\n%s ", prefix);
2616 dump_flt_cmd (stage, INDEX_TO_CMD_ID (i), indent + 4);
2618 fprintf (stderr, ")");
2621 fprintf (stderr, ")");