code.delx.au - gnu-emacs/blob - src/composite.h

   1 /* Header for composite sequence handler.
   2    Copyright (C) 2001, 2002, 2003, 2004, 2005,
   3                  2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
   4    Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
   5      National Institute of Advanced Industrial Science and Technology (AIST)
   6      Registration Number H14PRO021
   7    Copyright (C) 2003, 2006
   8      National Institute of Advanced Industrial Science and Technology (AIST)
   9      Registration Number H13PRO009
  10
  11 This file is part of GNU Emacs.
  12
  13 GNU Emacs is free software: you can redistribute it and/or modify
  14 it under the terms of the GNU General Public License as published by
  15 the Free Software Foundation, either version 3 of the License, or
  16 (at your option) any later version.
  17
  18 GNU Emacs is distributed in the hope that it will be useful,
  19 but WITHOUT ANY WARRANTY; without even the implied warranty of
  20 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21 GNU General Public License for more details.
  22
  23 You should have received a copy of the GNU General Public License
  24 along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
  25
  26 #ifndef EMACS_COMPOSITE_H
  27 #define EMACS_COMPOSITE_H
  28
  29 /* Methods to display a sequence of components of a composition.  */
  30 enum composition_method {
  31   /* Compose relatively without alternate characters.  */
  32   COMPOSITION_RELATIVE,
  33   /* Compose by specified composition rules.  This is not used in
  34      Emacs 21 but we need it to decode files saved in the older
  35      versions of Emacs.  */
  36   COMPOSITION_WITH_RULE,
  37   /* Compose relatively with alternate characters.  */
  38   COMPOSITION_WITH_ALTCHARS,
  39   /* Compose by specified composition rules with alternate characters.  */
  40   COMPOSITION_WITH_RULE_ALTCHARS,
  41   /* This is not a method.  */
  42   COMPOSITION_NO
  43 };
  44
  45 /* Maximum number of compoments a single composition can have.  */
  46 #define MAX_COMPOSITION_COMPONENTS 16
  47
  48 /* These macros access information about a composition that
  49    has `composition' property PROP.  PROP is:
  50         ((LENGTH . COMPONENTS) . MODIFICATION-FUNC)
  51    or
  52         (COMPOSITION-ID . (LENGTH COMPONENTS . MODIFICATION-FUNC))
  53    They don't check validity of PROP.  */
  54
  55 /* Temporary variable used only in the following macros.  */
  56 extern Lisp_Object composition_temp;
  57
  58 /* Return 1 if the composition is already registered.  */
  59 #define COMPOSITION_REGISTERD_P(prop) INTEGERP (XCAR (prop))
  60
  61 /* Return ID number of the already registered composition.  */
  62 #define COMPOSITION_ID(prop) XINT (XCAR (prop))
  63
  64 /* Return length of the composition.  */
  65 #define COMPOSITION_LENGTH(prop)        \
  66   (COMPOSITION_REGISTERD_P (prop)       \
  67    ? XINT (XCAR (XCDR (prop)))          \
  68    : XINT (XCAR (XCAR (prop))))
  69
  70 /* Return components of the composition.  */
  71 #define COMPOSITION_COMPONENTS(prop)    \
  72   (COMPOSITION_REGISTERD_P (prop)       \
  73    ? XCAR (XCDR (XCDR (prop)))          \
  74    : XCDR (XCAR (prop)))
  75
  76 /* Return modification function of the composition.  */
  77 #define COMPOSITION_MODIFICATION_FUNC(prop)     \
  78   (COMPOSITION_REGISTERD_P (prop)               \
  79    ? XCDR (XCDR (XCDR (prop)))                  \
  80    : CONSP (prop) ? XCDR (prop) : Qnil)
  81
  82 /* Return the method of composition.  */
  83 #define COMPOSITION_METHOD(prop)                                        \
  84   (COMPOSITION_REGISTERD_P (prop)                                       \
  85    ? composition_table[COMPOSITION_ID (prop)]->method                   \
  86    : (composition_temp = XCDR (XCAR (prop)),                            \
  87       (NILP (composition_temp)                                          \
  88        ? COMPOSITION_RELATIVE                                           \
  89        : (INTEGERP (composition_temp) || STRINGP (composition_temp))    \
  90        ? COMPOSITION_WITH_ALTCHARS                                      \
  91        : COMPOSITION_WITH_RULE_ALTCHARS)))
  92
  93 /* Return 1 if the composition is valid.  It is valid if length of
  94    the composition equals to (END - START).  */
  95 #define COMPOSITION_VALID_P(start, end, prop)                   \
  96   (CONSP (prop)                                                 \
  97    && (COMPOSITION_REGISTERD_P (prop)                           \
  98        ? (COMPOSITION_ID (prop) >= 0                            \
  99           && COMPOSITION_ID (prop) <= n_compositions            \
 100           && CONSP (XCDR (prop)))                               \
 101        : (composition_temp = XCAR (prop),                       \
 102           (CONSP (composition_temp)                             \
 103            && (composition_temp = XCDR (composition_temp),      \
 104                (NILP (composition_temp)                         \
 105                 || STRINGP (composition_temp)                   \
 106                 || VECTORP (composition_temp)                   \
 107                 || INTEGERP (composition_temp)                  \
 108                 || CONSP (composition_temp))))))                \
 109    && (end - start) == COMPOSITION_LENGTH (prop))
 110
 111 /* Return the Nth glyph of composition specified by CMP.  CMP is a
 112    pointer to `struct composition'. */
 113 #define COMPOSITION_GLYPH(cmp, n)                                       \
 114   XINT (XVECTOR (XVECTOR (XHASH_TABLE (composition_hash_table)          \
 115                           ->key_and_value)                              \
 116                  ->contents[cmp->hash_index * 2])                       \
 117         ->contents[cmp->method == COMPOSITION_WITH_RULE_ALTCHARS        \
 118                   ? (n) * 2 : (n)])
 119
 120 /* Return the encoded composition rule to compose the Nth glyph of
 121    rule-base composition specified by CMP.  CMP is a pointer to
 122    `struct composition'. */
 123 #define COMPOSITION_RULE(cmp, n)                                \
 124   XINT (XVECTOR (XVECTOR (XHASH_TABLE (composition_hash_table)  \
 125                           ->key_and_value)                      \
 126                  ->contents[cmp->hash_index * 2])               \
 127         ->contents[(n) * 2 - 1])
 128
 129 /* Decode encoded composition rule RULE_CODE into GREF (global
 130    reference point code), NREF (new reference point code), XOFF
 131    (horizontal offset) YOFF (vertical offset).  Don't check RULE_CODE,
 132    always set GREF and NREF to valid values.  By side effect,
 133    RULE_CODE is modified.  */
 134
 135 #define COMPOSITION_DECODE_RULE(rule_code, gref, nref, xoff, yoff)      \
 136   do {                                                                  \
 137     xoff = (rule_code) >> 16;                                           \
 138     yoff = ((rule_code) >> 8) & 0xFF;                                   \
 139     rule_code &= 0xFF;                                                  \
 140     gref = (rule_code) / 12;                                            \
 141     if (gref > 12) gref = 11;                                           \
 142     nref = (rule_code) % 12;                                            \
 143   } while (0)
 144
 145 /* Return encoded composition rule for the pair of global reference
 146    point GREF and new reference point NREF.  If arguments are invalid,
 147    return -1. */
 148 #define COMPOSITION_ENCODE_RULE(gref, nref)             \
 149   ((unsigned) (gref) < 12 && (unsigned) (nref) < 12     \
 150    ? (gref) * 12 + (nref) : -1)
 151
 152 /* Data structure that records information about a composition
 153    currently used in some buffers or strings.
 154
 155    When a composition is assigned an ID number (by
 156    get_composition_id), this structure is allocated for the
 157    composition and linked in composition_table[ID].
 158
 159    Identical compositions appearing at different places have the same
 160    ID, and thus share the same instance of this structure.  */
 161
 162 struct composition {
 163   /* Number of glyphs of the composition components.  */
 164   unsigned glyph_len;
 165
 166   /* Width, ascent, and descent pixels of the composition.  */
 167   short pixel_width, ascent, descent;
 168
 169   short lbearing, rbearing;
 170
 171   /* How many columns the overall glyphs occupy on the screen.  This
 172      gives an approximate value for column calculation in
 173      Fcurrent_column, and etc.  */
 174   unsigned short width;
 175
 176   /* Method of the composition.  */
 177   enum composition_method method;
 178
 179   /* Index to the composition hash table.  */
 180   int hash_index;
 181
 182   /* For which font we have calculated the remaining members.  The
 183      actual type is device dependent.  */
 184   void *font;
 185
 186   /* Pointer to an array of x-offset and y-offset (by pixels) of
 187      glyphs.  This points to a sufficient memory space (sizeof (int) *
 188      glyph_len * 2) that is allocated when the composition is
 189      registered in composition_table.  X-offset and Y-offset of Nth
 190      glyph are (2N)th and (2N+1)th elements respectively.  */
 191   short *offsets;
 192 };
 193
 194 /* Table of pointers to the structure `composition' indexed by
 195    COMPOSITION-ID.  */
 196 extern struct composition **composition_table;
 197 /* Number of the currently registered compositions.  */
 198 extern int n_compositions;
 199
 200 /* Mask bits for CHECK_MASK arg to update_compositions.
 201    For a change in the region FROM and TO, check compositions ... */
 202 #define CHECK_HEAD      1       /* adjacent to FROM */
 203 #define CHECK_TAIL      2       /* adjacent to TO */
 204 #define CHECK_INSIDE    4       /* between FROM and TO */
 205 #define CHECK_BORDER    (CHECK_HEAD | CHECK_TAIL)
 206 #define CHECK_ALL       (CHECK_BORDER | CHECK_INSIDE)
 207
 208 extern Lisp_Object Qcomposition;
 209 extern Lisp_Object composition_hash_table;
 210 extern Lisp_Object Qauto_composed;
 211 extern Lisp_Object Qauto_composition_function;
 212 extern int get_composition_id (EMACS_INT, EMACS_INT, EMACS_INT,
 213                                Lisp_Object, Lisp_Object);
 214 extern int find_composition (EMACS_INT, EMACS_INT, EMACS_INT *, EMACS_INT *,
 215                              Lisp_Object *, Lisp_Object);
 216 extern void update_compositions (EMACS_INT, EMACS_INT, int);
 217 extern void make_composition_value_copy (Lisp_Object);
 218 extern void compose_region (int, int, Lisp_Object, Lisp_Object,
 219                             Lisp_Object);
 220 extern void syms_of_composite (void);
 221 extern void compose_text (EMACS_INT, EMACS_INT, Lisp_Object, Lisp_Object,
 222                           Lisp_Object);
 223
 224 /* Macros for lispy glyph-string.  This is completely different from
 225    struct glyph_string.  */
 226
 227 #define LGSTRING_HEADER(lgs) AREF (lgs, 0)
 228 #define LGSTRING_SET_HEADER(lgs, header) ASET (lgs, 0, header)
 229
 230 #define LGSTRING_FONT(lgs) AREF (LGSTRING_HEADER (lgs), 0)
 231 #define LGSTRING_CHAR(lgs, i) AREF (LGSTRING_HEADER (lgs), (i) + 1)
 232 #define LGSTRING_CHAR_LEN(lgs) (ASIZE (LGSTRING_HEADER (lgs)) - 1)
 233
 234 #define LGSTRING_SET_FONT(lgs, val) ASET (LGSTRING_HEADER (lgs), 0, (val))
 235 #define LGSTRING_SET_CHAR(lgs, i, c) ASET (LGSTRING_HEADER (lgs), (i) + 1, (c))
 236
 237 #define LGSTRING_ID(lgs) AREF (lgs, 1)
 238 #define LGSTRING_SET_ID(lgs, id) ASET (lgs, 1, id)
 239
 240 #define LGSTRING_GLYPH_LEN(lgs) (ASIZE ((lgs)) - 2)
 241 #define LGSTRING_GLYPH(lgs, idx) AREF ((lgs), (idx) + 2)
 242 #define LGSTRING_SET_GLYPH(lgs, idx, val) ASET ((lgs), (idx) + 2, (val))
 243
 244 /* Vector size of Lispy glyph.  */
 245 enum lglyph_indices
 246   {
 247     LGLYPH_IX_FROM, LGLYPH_IX_TO,  LGLYPH_IX_CHAR, LGLYPH_IX_CODE,
 248     LGLYPH_IX_WIDTH, LGLYPH_IX_LBEARING, LGLYPH_IX_RBEARING,
 249     LGLYPH_IX_ASCENT, LGLYPH_IX_DESCENT, LGLYPH_IX_ADJUSTMENT,
 250     /* Not an index.  */
 251     LGLYPH_SIZE
 252   };
 253
 254 #define LGLYPH_NEW() Fmake_vector (make_number (LGLYPH_SIZE), Qnil)
 255 #define LGLYPH_FROM(g) XINT (AREF ((g), LGLYPH_IX_FROM))
 256 #define LGLYPH_TO(g) XINT (AREF ((g), LGLYPH_IX_TO))
 257 #define LGLYPH_CHAR(g) XINT (AREF ((g), LGLYPH_IX_CHAR))
 258 #define LGLYPH_CODE(g)                                          \
 259   (NILP (AREF ((g), LGLYPH_IX_CODE))                            \
 260    ? FONT_INVALID_CODE                                          \
 261    : CONSP (AREF ((g), LGLYPH_IX_CODE))                         \
 262    ? ((XFASTINT (XCAR (AREF ((g), LGLYPH_IX_CODE))) << 16)      \
 263       | (XFASTINT (XCDR (AREF ((g), LGLYPH_IX_CODE)))))         \
 264    : XFASTINT (AREF ((g), LGLYPH_IX_CODE)))
 265 #define LGLYPH_WIDTH(g) XINT (AREF ((g), LGLYPH_IX_WIDTH))
 266 #define LGLYPH_LBEARING(g) XINT (AREF ((g), LGLYPH_IX_LBEARING))
 267 #define LGLYPH_RBEARING(g) XINT (AREF ((g), LGLYPH_IX_RBEARING))
 268 #define LGLYPH_ASCENT(g) XINT (AREF ((g), LGLYPH_IX_ASCENT))
 269 #define LGLYPH_DESCENT(g) XINT (AREF ((g), LGLYPH_IX_DESCENT))
 270 #define LGLYPH_ADJUSTMENT(g) AREF ((g), LGLYPH_IX_ADJUSTMENT)
 271 #define LGLYPH_SET_FROM(g, val) ASET ((g), LGLYPH_IX_FROM, make_number (val))
 272 #define LGLYPH_SET_TO(g, val) ASET ((g), LGLYPH_IX_TO, make_number (val))
 273 #define LGLYPH_SET_CHAR(g, val) ASET ((g), LGLYPH_IX_CHAR, make_number (val))
 274 /* Callers must assure that VAL is not negative!  */
 275 #define LGLYPH_SET_CODE(g, val)                                         \
 276   do {                                                                  \
 277     if (val == FONT_INVALID_CODE)                                       \
 278       ASET ((g), LGLYPH_IX_CODE, Qnil);                                 \
 279     else if ((EMACS_INT)val > MOST_POSITIVE_FIXNUM)                     \
 280       ASET ((g), LGLYPH_IX_CODE, Fcons (make_number ((val) >> 16),      \
 281                                         make_number ((val) & 0xFFFF))); \
 282     else                                                                \
 283       ASET ((g), LGLYPH_IX_CODE, make_number (val));                    \
 284   } while (0)
 285
 286 #define LGLYPH_SET_WIDTH(g, val) ASET ((g), LGLYPH_IX_WIDTH, make_number (val))
 287 #define LGLYPH_SET_LBEARING(g, val) ASET ((g), LGLYPH_IX_LBEARING, make_number (val))
 288 #define LGLYPH_SET_RBEARING(g, val) ASET ((g), LGLYPH_IX_RBEARING, make_number (val))
 289 #define LGLYPH_SET_ASCENT(g, val) ASET ((g), LGLYPH_IX_ASCENT, make_number (val))
 290 #define LGLYPH_SET_DESCENT(g, val) ASET ((g), LGLYPH_IX_DESCENT, make_number (val))
 291 #define LGLYPH_SET_ADJUSTMENT(g, val) ASET ((g), LGLYPH_IX_ADJUSTMENT, (val))
 292
 293 #define LGLYPH_XOFF(g) (VECTORP (LGLYPH_ADJUSTMENT (g)) \
 294                         ? XINT (AREF (LGLYPH_ADJUSTMENT (g), 0)) : 0)
 295 #define LGLYPH_YOFF(g) (VECTORP (LGLYPH_ADJUSTMENT (g)) \
 296                         ? XINT (AREF (LGLYPH_ADJUSTMENT (g), 1)) : 0)
 297 #define LGLYPH_WADJUST(g) (VECTORP (LGLYPH_ADJUSTMENT (g)) \
 298                            ? XINT (AREF (LGLYPH_ADJUSTMENT (g), 2)) : 0)
 299
 300 struct composition_it;
 301 struct face;
 302 struct font_metrics;
 303
 304 extern Lisp_Object composition_gstring_put_cache (Lisp_Object, int);
 305 extern Lisp_Object composition_gstring_from_id (int);
 306 extern int composition_gstring_p (Lisp_Object);
 307 extern int composition_gstring_width (Lisp_Object, EMACS_INT, EMACS_INT,
 308                                       struct font_metrics *);
 309
 310 extern void composition_compute_stop_pos (struct composition_it *,
 311                                           EMACS_INT, EMACS_INT, EMACS_INT,
 312                                           Lisp_Object);
 313 extern int composition_reseat_it (struct composition_it *,
 314                                   EMACS_INT, EMACS_INT, EMACS_INT,
 315                                   struct window *, struct face *,
 316                                   Lisp_Object);
 317 extern int composition_update_it (struct composition_it *,
 318                                   EMACS_INT, EMACS_INT, Lisp_Object);
 319
 320 extern EMACS_INT composition_adjust_point (EMACS_INT, EMACS_INT);
 321
 322 EXFUN (Fcomposition_get_gstring, 4);
 323
 324 #endif /* not EMACS_COMPOSITE_H */
 325