#include "buffer.h"
#include "character.h"
#include "intervals.h"
+#include "window.h"
+#include "frame.h"
+#include "dispextern.h"
+#include "font.h"
/* Emacs uses special text property `composition' to support character
composition. A sequence of characters that have the same (i.e. eq)
Lisp_Object Qauto_composed;
Lisp_Object Vauto_composition_function;
Lisp_Object Qauto_composition_function;
+Lisp_Object Vcomposition_function_table;
EXFUN (Fremove_list_of_text_properties, 4);
: ((INTEGERP (components) || STRINGP (components))
? COMPOSITION_WITH_ALTCHARS
: COMPOSITION_WITH_RULE_ALTCHARS));
- if (cmp->method == COMPOSITION_WITH_RULE_ALTCHARS
- && VECTORP (components)
- && ! INTEGERP (AREF (components, 0)))
- cmp->method = COMPOSITION_WITH_GLYPH_STRING;
cmp->hash_index = hash_index;
glyph_len = (cmp->method == COMPOSITION_WITH_RULE_ALTCHARS
? (XVECTOR (key)->size + 1) / 2
cmp->offsets = (short *) xmalloc (sizeof (short) * glyph_len * 2);
cmp->font = NULL;
- /* Calculate the width of overall glyphs of the composition. */
- if (cmp->method == COMPOSITION_WITH_GLYPH_STRING)
- {
- cmp->width = 1; /* Should be fixed later. */
- cmp->glyph_len--;
- }
- else if (cmp->method != COMPOSITION_WITH_RULE_ALTCHARS)
+ if (cmp->method != COMPOSITION_WITH_RULE_ALTCHARS)
{
/* Relative composition. */
cmp->width = 0;
Fput_text_property (make_number (start), make_number (end),
Qcomposition, prop, string);
}
+
+
+static Lisp_Object autocmp_chars P_ ((Lisp_Object, EMACS_INT, EMACS_INT,
+ EMACS_INT, struct window *,
+ struct face *, Lisp_Object));
+
+\f
+/* Lisp glyph-string handlers */
+
+/* Hash table for automatic composition. The key is a header of a
+ lgstring (Lispy glyph-string), and the value is a body of a
+ lgstring. */
+
+static Lisp_Object gstring_hash_table;
+
+static Lisp_Object gstring_lookup_cache P_ ((Lisp_Object));
+
+static Lisp_Object
+gstring_lookup_cache (header)
+ Lisp_Object header;
+{
+ struct Lisp_Hash_Table *h = XHASH_TABLE (gstring_hash_table);
+ int i = hash_lookup (h, header, NULL);
+
+ return (i >= 0 ? HASH_VALUE (h, i) : Qnil);
+}
+
+Lisp_Object
+composition_gstring_put_cache (gstring, len)
+ Lisp_Object gstring;
+ int len;
+{
+ struct Lisp_Hash_Table *h = XHASH_TABLE (gstring_hash_table);
+ unsigned hash;
+ Lisp_Object header, copy;
+ int i;
+
+ header = LGSTRING_HEADER (gstring);
+ hash = h->hashfn (h, header);
+ if (len < 0)
+ {
+ len = LGSTRING_GLYPH_LEN (gstring);
+ for (i = 0; i < len; i++)
+ if (NILP (LGSTRING_GLYPH (gstring, i)))
+ break;
+ len = i;
+ }
+
+ copy = Fmake_vector (make_number (len + 2), Qnil);
+ LGSTRING_SET_HEADER (copy, Fcopy_sequence (header));
+ for (i = 0; i < len; i++)
+ LGSTRING_SET_GLYPH (copy, i, Fcopy_sequence (LGSTRING_GLYPH (gstring, i)));
+ i = hash_put (h, LGSTRING_HEADER (copy), copy, hash);
+ LGSTRING_SET_ID (copy, make_number (i));
+ return copy;
+}
+
+Lisp_Object
+composition_gstring_from_id (id)
+ int id;
+{
+ struct Lisp_Hash_Table *h = XHASH_TABLE (gstring_hash_table);
+
+ return HASH_VALUE (h, id);
+}
+
+static Lisp_Object fill_gstring_header P_ ((Lisp_Object, Lisp_Object,
+ Lisp_Object, Lisp_Object,
+ Lisp_Object));
+
+int
+composition_gstring_p (gstring)
+ Lisp_Object gstring;
+{
+ Lisp_Object header;
+ int i;
+
+ if (! VECTORP (gstring) || ASIZE (gstring) < 2)
+ return 0;
+ header = LGSTRING_HEADER (gstring);
+ if (! VECTORP (header) || ASIZE (header) < 2)
+ return 0;
+ if (! NILP (LGSTRING_FONT (gstring))
+ && ! FONT_OBJECT_P (LGSTRING_FONT (gstring)))
+ return 0;
+ for (i = 1; i < ASIZE (LGSTRING_HEADER (gstring)); i++)
+ if (! NATNUMP (AREF (LGSTRING_HEADER (gstring), i)))
+ return 0;
+ if (! NILP (LGSTRING_ID (gstring)) && ! NATNUMP (LGSTRING_ID (gstring)))
+ return 0;
+ for (i = 0; i < LGSTRING_GLYPH_LEN (gstring); i++)
+ {
+ Lisp_Object glyph = LGSTRING_GLYPH (gstring, i);
+ if (NILP (glyph))
+ break;
+ if (! VECTORP (glyph) || ASIZE (glyph) != LGLYPH_SIZE)
+ return 0;
+ }
+ return 1;
+}
+
+int
+composition_gstring_width (gstring, from, to, metrics)
+ Lisp_Object gstring;
+ int from, to;
+ struct font_metrics *metrics;
+{
+ Lisp_Object *glyph;
+ int width = 0;
+
+ if (metrics)
+ {
+ Lisp_Object font_object = LGSTRING_FONT (gstring);
+ struct font *font = XFONT_OBJECT (font_object);
+
+ metrics->ascent = font->ascent;
+ metrics->descent = font->descent;
+ metrics->width = metrics->lbearing = metrics->rbearing = 0;
+ }
+ for (glyph = &LGSTRING_GLYPH (gstring, from); from < to; from++, glyph++)
+ {
+ int x;
+
+ if (NILP (LGLYPH_ADJUSTMENT (*glyph)))
+ width += LGLYPH_WIDTH (*glyph);
+ else
+ width += LGLYPH_WADJUST (*glyph);
+ if (metrics)
+ {
+ x = metrics->width + LGLYPH_LBEARING (*glyph) + LGLYPH_XOFF (*glyph);
+ if (metrics->lbearing > x)
+ metrics->lbearing = x;
+ x = metrics->width + LGLYPH_RBEARING (*glyph) + LGLYPH_XOFF (*glyph);
+ if (metrics->rbearing < x)
+ metrics->rbearing = x;
+ metrics->width = width;
+ x = LGLYPH_ASCENT (*glyph) - LGLYPH_YOFF (*glyph);
+ if (metrics->ascent < x)
+ metrics->ascent = x;
+ x = LGLYPH_DESCENT (*glyph) - LGLYPH_YOFF (*glyph);
+ if (metrics->descent < x)
+ metrics->descent = x;
+ }
+ }
+ return width;
+}
+
+
+static Lisp_Object gstring_work;
+static Lisp_Object gstring_work_headers;
+
+static Lisp_Object
+fill_gstring_header (header, start, end, font_object, string)
+ Lisp_Object header, start, end, font_object, string;
+{
+ EMACS_INT from, to, from_byte;
+ EMACS_INT len, i;
+
+ if (NILP (string))
+ {
+ if (NILP (current_buffer->enable_multibyte_characters))
+ error ("Attempt to shape unibyte text");
+ validate_region (&start, &end);
+ from = XFASTINT (start);
+ to = XFASTINT (end);
+ from_byte = CHAR_TO_BYTE (from);
+ }
+ else
+ {
+ CHECK_STRING (string);
+ if (! STRING_MULTIBYTE (current_buffer->enable_multibyte_characters))
+ error ("Attempt to shape unibyte text");
+ CHECK_NATNUM (start);
+ from = XINT (start);
+ CHECK_NATNUM (end);
+ to = XINT (end);
+ if (from < 0 || from > to || to > SCHARS (string))
+ args_out_of_range_3 (string, start, end);
+ from_byte = string_char_to_byte (string, from);
+ }
+
+ len = to - from;
+ if (len == 0)
+ error ("Attempt to shape zero-length text");
+ if (VECTORP (header))
+ {
+ if (ASIZE (header) != len + 1)
+ args_out_of_range (header, make_number (len + 1));
+ }
+ else
+ {
+ if (len <= 8)
+ header = AREF (gstring_work_headers, len - 1);
+ else
+ header = Fmake_vector (make_number (len + 1), Qnil);
+ }
+
+ ASET (header, 0, font_object);
+ for (i = 0; i < len; i++)
+ {
+ int c;
+
+ if (NILP (string))
+ FETCH_CHAR_ADVANCE_NO_CHECK (c, from, from_byte);
+ else
+ FETCH_STRING_CHAR_ADVANCE_NO_CHECK (c, string, from, from_byte);
+ ASET (header, i + 1, make_number (c));
+ }
+ return header;
+}
+
+extern void font_fill_lglyph_metrics P_ ((Lisp_Object, Lisp_Object));
+
+static void
+fill_gstring_body (gstring)
+ Lisp_Object gstring;
+{
+ Lisp_Object font_object = LGSTRING_FONT (gstring);
+ Lisp_Object header = AREF (gstring, 0);
+ EMACS_INT len = LGSTRING_CHAR_LEN (gstring);
+ EMACS_INT i;
+
+ for (i = 0; i < len; i++)
+ {
+ Lisp_Object g = LGSTRING_GLYPH (gstring, i);
+ int c = XINT (AREF (header, i + 1));
+
+ if (NILP (g))
+ {
+ g = LGLYPH_NEW ();
+ LGSTRING_SET_GLYPH (gstring, i, g);
+ }
+ LGLYPH_SET_FROM (g, i);
+ LGLYPH_SET_TO (g, i);
+ LGLYPH_SET_CHAR (g, c);
+ if (! NILP (font_object))
+ {
+ font_fill_lglyph_metrics (g, font_object);
+ }
+ else
+ {
+ int width = XFASTINT (CHAR_TABLE_REF (Vchar_width_table, c));
+
+ LGLYPH_SET_CODE (g, c);
+ LGLYPH_SET_LBEARING (g, 0);
+ LGLYPH_SET_RBEARING (g, width);
+ LGLYPH_SET_WIDTH (g, width);
+ LGLYPH_SET_ASCENT (g, 1);
+ LGLYPH_SET_DESCENT (g, 0);
+ }
+ LGLYPH_SET_ADJUSTMENT (g, Qnil);
+ }
+ if (i < LGSTRING_GLYPH_LEN (gstring))
+ LGSTRING_SET_GLYPH (gstring, i, Qnil);
+}
+
+EXFUN (Fre_search_forward, 4);
+
+/* Try to compose the characters at CHARPOS according to CFT_ELEMENT
+ which is an element of composition-fucntion-table (which see).
+ LIMIT limits the characters to compose. STRING, if not nil, is a
+ target string. WIN is a window where the characters are being
+ displayed. */
+
+static Lisp_Object
+autocmp_chars (cft_element, charpos, bytepos, limit, win, face, string)
+ Lisp_Object cft_element;
+ EMACS_INT charpos, bytepos, limit;
+ struct window *win;
+ struct face *face;
+ Lisp_Object string;
+{
+ int count = SPECPDL_INDEX ();
+ FRAME_PTR f = XFRAME (win->frame);
+ Lisp_Object pos = make_number (charpos);
+ EMACS_INT pt = PT, pt_byte = PT_BYTE;
+
+ record_unwind_save_match_data ();
+ for (; CONSP (cft_element); cft_element = XCDR (cft_element))
+ {
+ Lisp_Object elt = XCAR (cft_element);
+ Lisp_Object re;
+ Lisp_Object font_object = Qnil, gstring;
+ EMACS_INT to;
+
+ if (! VECTORP (elt) || ASIZE (elt) != 3)
+ continue;
+ re = AREF (elt, 0);
+ if (NILP (string))
+ TEMP_SET_PT_BOTH (charpos, bytepos);
+ if (NILP (re)
+ || (STRINGP (re)
+ && (STRINGP (string)
+ ? EQ (Fstring_match (re, string, pos), pos)
+ : (! NILP (Fre_search_forward (re, make_number (limit), Qt, Qnil))
+ && EQ (Fmatch_beginning (make_number (0)), pos)))))
+ {
+ to = (NILP (re) ? charpos + 1 : XINT (Fmatch_end (make_number (0))));
+#ifdef HAVE_WINDOW_SYSTEM
+ if (FRAME_WINDOW_P (f))
+ {
+ font_object = font_range (charpos, &to, win, face, string);
+ if (! FONT_OBJECT_P (font_object))
+ {
+ if (NILP (string))
+ TEMP_SET_PT_BOTH (pt, pt_byte);
+ return unbind_to (count, Qnil);
+ }
+ }
+#endif /* not HAVE_WINDOW_SYSTEM */
+ gstring = Fcomposition_get_gstring (pos, make_number (to),
+ font_object, string);
+ if (NILP (LGSTRING_ID (gstring)))
+ {
+ Lisp_Object args[6];
+
+ args[0] = Vauto_composition_function;
+ args[1] = AREF (elt, 2);
+ args[2] = pos;
+ args[3] = make_number (to);
+ args[4] = font_object;
+ args[5] = string;
+ gstring = safe_call (6, args);
+ }
+ if (NILP (string))
+ TEMP_SET_PT_BOTH (pt, pt_byte);
+ return unbind_to (count, gstring);
+ }
+ }
+ if (NILP (string))
+ TEMP_SET_PT_BOTH (pt, pt_byte);
+ return unbind_to (count, Qnil);
+}
+
+
+/* Update cmp_it->stop_pos to the next position after CHARPOS (and
+ BYTEPOS) where character composition may happen. If BYTEPOS is
+ negative, compoute it. If it is a static composition, set
+ cmp_it->ch to -1. Otherwise, set cmp_it->ch to the character that
+ triggers a automatic composition. */
+
+void
+composition_compute_stop_pos (cmp_it, charpos, bytepos, endpos, string)
+ struct composition_it *cmp_it;
+ EMACS_INT charpos, bytepos, endpos;
+ Lisp_Object string;
+{
+ EMACS_INT start, end, c;
+ Lisp_Object prop, val;
+
+ cmp_it->stop_pos = endpos;
+ if (find_composition (charpos, endpos, &start, &end, &prop, string)
+ && COMPOSITION_VALID_P (start, end, prop))
+ {
+ cmp_it->stop_pos = endpos = start;
+ cmp_it->ch = -1;
+ }
+ if (NILP (current_buffer->enable_multibyte_characters)
+ || ! FUNCTIONP (Vauto_composition_function))
+ return;
+ if (bytepos < 0)
+ {
+ if (STRINGP (string))
+ bytepos = string_char_to_byte (string, charpos);
+ else
+ bytepos = CHAR_TO_BYTE (charpos);
+ }
+
+ start = charpos;
+ while (charpos < endpos)
+ {
+ if (STRINGP (string))
+ FETCH_STRING_CHAR_ADVANCE (c, string, charpos, bytepos);
+ else
+ FETCH_CHAR_ADVANCE (c, charpos, bytepos);
+ val = CHAR_TABLE_REF (Vcomposition_function_table, c);
+ if (! NILP (val))
+ {
+ Lisp_Object elt;
+
+ for (; CONSP (val); val = XCDR (val))
+ {
+ elt = XCAR (val);
+ if (VECTORP (elt) && ASIZE (elt) == 3 && NATNUMP (AREF (elt, 1))
+ && charpos - 1 - XFASTINT (AREF (elt, 1)) >= start)
+ break;
+ }
+ if (CONSP (val))
+ {
+ cmp_it->stop_pos = charpos - 1 - XFASTINT (AREF (elt, 1));
+ cmp_it->ch = c;
+ break;
+ }
+ }
+ }
+}
+
+/* Check if the character at CHARPOS (and BYTEPOS) is composed
+ (possibly with the following charaters) on window W. ENDPOS limits
+ characters to be composed. FACE, in non-NULL, is a base face of
+ the character. If STRING is not nil, it is a string containing the
+ character to check, and CHARPOS and BYTEPOS are indices in the
+ string. In that case, FACE must not be NULL.
+
+ If the character is composed, setup members of CMP_IT (id, nglyphs,
+ and from), and return 1. Otherwise, update CMP_IT->stop_pos, and
+ return 0. */
+
+int
+composition_reseat_it (cmp_it, charpos, bytepos, endpos, w, face, string)
+ struct composition_it *cmp_it;
+ EMACS_INT charpos, bytepos, endpos;
+ struct window *w;
+ struct face *face;
+ Lisp_Object string;
+{
+ if (cmp_it->ch < 0)
+ {
+ /* We are looking at a static composition. */
+ EMACS_INT start, end;
+ Lisp_Object prop;
+
+ find_composition (charpos, -1, &start, &end, &prop, string);
+ cmp_it->id = get_composition_id (charpos, bytepos, end - start,
+ prop, string);
+ if (cmp_it->id < 0)
+ goto no_composition;
+ cmp_it->nchars = end - start;
+ cmp_it->nglyphs = composition_table[cmp_it->id]->glyph_len;
+ }
+ else
+ {
+ Lisp_Object val;
+ int i;
+
+ val = CHAR_TABLE_REF (Vcomposition_function_table, cmp_it->ch);
+ if (NILP (val))
+ goto no_composition;
+ val = autocmp_chars (val, charpos, bytepos, endpos, w, face, string);
+ if (! composition_gstring_p (val))
+ goto no_composition;
+ if (NILP (LGSTRING_ID (val)))
+ val = composition_gstring_put_cache (val, -1);
+ cmp_it->id = XINT (LGSTRING_ID (val));
+ for (i = 0; i < LGSTRING_GLYPH_LEN (val); i++)
+ if (NILP (LGSTRING_GLYPH (val, i)))
+ break;
+ cmp_it->nglyphs = i;
+ }
+ cmp_it->from = 0;
+ return 1;
+
+ no_composition:
+ charpos++;
+ if (STRINGP (string))
+ bytepos += MULTIBYTE_LENGTH_NO_CHECK (SDATA (string) + bytepos);
+ else
+ INC_POS (bytepos);
+ composition_compute_stop_pos (cmp_it, charpos, bytepos, endpos, string);
+ return 0;
+}
+
+int
+composition_update_it (cmp_it, charpos, bytepos, string)
+ struct composition_it *cmp_it;
+ EMACS_INT charpos, bytepos;
+ Lisp_Object string;
+{
+ int i, c;
+
+ if (cmp_it->ch < 0)
+ {
+ struct composition *cmp = composition_table[cmp_it->id];
+
+ cmp_it->to = cmp_it->nglyphs;
+ if (cmp_it->nglyphs == 0)
+ c = -1;
+ else
+ {
+ for (i = 0; i < cmp->glyph_len; i++)
+ if ((c = COMPOSITION_GLYPH (cmp, i)) != '\t')
+ break;
+ if (c == '\t')
+ c = ' ';
+ }
+ cmp_it->width = cmp->width;
+ }
+ else
+ {
+ Lisp_Object gstring = composition_gstring_from_id (cmp_it->id);
+
+ if (cmp_it->nglyphs == 0)
+ {
+ c = -1;
+ cmp_it->nchars = LGSTRING_CHAR_LEN (gstring);
+ cmp_it->width = 0;
+ }
+ else
+ {
+ Lisp_Object glyph = LGSTRING_GLYPH (gstring, cmp_it->from);
+ int from = LGLYPH_FROM (glyph);
+
+ c = LGSTRING_CHAR (gstring, from);
+ cmp_it->nchars = LGLYPH_TO (glyph) - from + 1;
+ cmp_it->width = (LGLYPH_WIDTH (glyph) > 0
+ ? CHAR_WIDTH (LGLYPH_CHAR (glyph)) : 0);
+ for (cmp_it->to = cmp_it->from + 1; cmp_it->to < cmp_it->nglyphs;
+ cmp_it->to++)
+ {
+ glyph = LGSTRING_GLYPH (gstring, cmp_it->to);
+ if (LGLYPH_FROM (glyph) != from)
+ break;
+ if (LGLYPH_WIDTH (glyph) > 0)
+ cmp_it->width += CHAR_WIDTH (LGLYPH_CHAR (glyph));
+ }
+ }
+ }
+
+ charpos += cmp_it->nchars;
+ if (STRINGP (string))
+ cmp_it->nbytes = string_char_to_byte (string, charpos) - bytepos;
+ else
+ cmp_it->nbytes = CHAR_TO_BYTE (charpos) - bytepos;
+ return c;
+}
+
+
+int
+composition_adjust_point (last_pt)
+ EMACS_INT last_pt;
+{
+ /* Now check the automatic composition. */
+ EMACS_INT charpos, bytepos, startpos, beg, end, pos;
+ Lisp_Object val, cat;
+ EMACS_INT limit;
+ int c;
+
+ if (PT == BEGV || PT == ZV)
+ return PT;
+
+ if (get_property_and_range (PT, Qcomposition, &val, &beg, &end, Qnil)
+ && COMPOSITION_VALID_P (beg, end, val)
+ && beg < PT /* && end > PT <- It's always the case. */
+ && (last_pt <= beg || last_pt >= end))
+ return (PT < last_pt ? beg : end);
+
+ if (NILP (current_buffer->enable_multibyte_characters)
+ || ! FUNCTIONP (Vauto_composition_function))
+ return PT;
+
+ c = FETCH_MULTIBYTE_CHAR (PT_BYTE);
+ cat = CHAR_TABLE_REF (Vunicode_category_table, c);
+ if (SYMBOLP (cat)
+ && ((c = SDATA (SYMBOL_NAME (cat))[0]) == 'C' || c == 'Z'))
+ /* A control character is never composed. */
+ return PT;
+
+ charpos = PT;
+ bytepos = PT_BYTE;
+ limit = (last_pt < PT ? last_pt : BEGV);
+ do {
+ DEC_BOTH (charpos, bytepos);
+ c = FETCH_MULTIBYTE_CHAR (bytepos);
+ cat = CHAR_TABLE_REF (Vunicode_category_table, c);
+ if (SYMBOLP (cat)
+ && ((c = SDATA (SYMBOL_NAME (cat))[0]) == 'C' || c == 'Z'))
+ {
+ INC_BOTH (charpos, bytepos);
+ break;
+ }
+ } while (charpos > limit);
+
+
+ limit = (last_pt < PT ? ZV : last_pt);
+ if (limit > PT + 3)
+ limit = PT + 3;
+ startpos = charpos;
+ while (charpos < limit)
+ {
+ c = FETCH_MULTIBYTE_CHAR (bytepos);
+ if (charpos > PT)
+ {
+ int ch;
+
+ cat = CHAR_TABLE_REF (Vunicode_category_table, c);
+ if (SYMBOLP (cat)
+ && ((ch = SDATA (SYMBOL_NAME (cat))[0]) == 'C' || ch == 'Z'))
+ return PT;
+ }
+ val = CHAR_TABLE_REF (Vcomposition_function_table, c);
+ if (! CONSP (val))
+ {
+ INC_BOTH (charpos, bytepos);
+ continue;
+ }
+ for (; CONSP (val); val = XCDR (val))
+ {
+ Lisp_Object elt = XCAR (val);
+
+ if (VECTORP (elt) && ASIZE (elt) == 3 && NATNUMP (AREF (elt, 1))
+ && (pos = charpos - XFASTINT (AREF (elt, 1))) < PT
+ && pos >= startpos)
+ {
+ Lisp_Object gstring;
+ EMACS_INT pos_byte;
+
+ if (XFASTINT (AREF (elt, 1)) == 0)
+ pos_byte = bytepos;
+ else
+ pos_byte = CHAR_TO_BYTE (pos);
+ gstring = autocmp_chars (val, pos, pos_byte, Z,
+ XWINDOW (selected_window), NULL, Qnil);
+ if (composition_gstring_p (gstring))
+ {
+ if (pos + LGSTRING_CHAR_LEN (gstring) > PT)
+ {
+ int i;
+
+ for (i = 0; i < LGSTRING_GLYPH_LEN (gstring); i++)
+ {
+ Lisp_Object glyph = LGSTRING_GLYPH (gstring, i);
+
+ if (NILP (glyph))
+ break;
+ if (pos + LGLYPH_FROM (glyph) == PT)
+ return PT;
+ if (pos + LGLYPH_TO (glyph) + 1 > PT)
+ return (PT < last_pt
+ ? pos + LGLYPH_FROM (glyph)
+ : pos + LGLYPH_TO (glyph) + 1);
+ }
+ return PT;
+ }
+ charpos = startpos = pos + LGSTRING_CHAR_LEN (gstring);
+ bytepos = CHAR_TO_BYTE (charpos);
+ break;
+ }
+ }
+ }
+ if (! CONSP (val))
+ INC_BOTH (charpos, bytepos);
+ }
+ return PT;
+}
+
+DEFUN ("composition-get-gstring", Fcomposition_get_gstring,
+ Scomposition_get_gstring, 4, 4, 0,
+ doc: /* Return a glyph-string for characters between FROM and TO.
+If the glhph string is for graphic display, FONT-OBJECT must be
+a font-object to use for those characters.
+Otherwise (for terminal display), FONT-OBJECT must be nil.
+
+If the optional 4th argument STRING is not nil, it is a string
+containing the target characters between indices FROM and TO.
+
+A glhph-string is a vector containing information about how to display
+specific character sequence. The format is:
+ [HEADER ID GLYPH ...]
+
+HEADER is a vector of this form:
+ [FONT-OBJECT CHAR ...]
+where
+ FONT-OBJECT is a font-object for all glyphs in the glyph-string,
+ or nil if not yet decided.
+ CHARs are characters to be composed by GLYPHs.
+
+ID is an identification number of the glyph-string. It may be nil if
+not yet shaped.
+
+GLYPH is a vector whose elements has this form:
+ [ FROM-IDX TO-IDX C CODE WIDTH LBEARING RBEARING ASCENT DESCENT
+ [ [X-OFF Y-OFF WADJUST] | nil] ]
+where
+ FROM-IDX and TO-IDX are used internally and should not be touched.
+ C is the character of the glyph.
+ CODE is the glyph-code of C in FONT-OBJECT.
+ WIDTH thru DESCENT are the metrics (in pixels) of the glyph.
+ X-OFF and Y-OFF are offests to the base position for the glyph.
+ WADJUST is the adjustment to the normal width of the glyph.
+
+If GLYPH is nil, the remaining elements of the glhph-string vector
+must be ignore. */)
+ (from, to, font_object, string)
+ Lisp_Object font_object, from, to, string;
+{
+ Lisp_Object gstring, header;
+
+ if (! NILP (font_object))
+ CHECK_FONT_OBJECT (font_object);
+ header = fill_gstring_header (Qnil, from, to, font_object, string);
+ gstring = gstring_lookup_cache (header);
+ if (! NILP (gstring))
+ return gstring;
+ LGSTRING_SET_HEADER (gstring_work, header);
+ LGSTRING_SET_ID (gstring_work, Qnil);
+ fill_gstring_body (gstring_work);
+ return gstring_work;
+}
+
\f
/* Emacs Lisp APIs. */
void
syms_of_composite ()
{
+ int i;
+
Qcomposition = intern ("composition");
staticpro (&Qcomposition);
- /* Make a hash table for composition. */
+ /* Make a hash table for static composition. */
{
Lisp_Object args[6];
extern Lisp_Object QCsize;
staticpro (&composition_hash_table);
}
+ /* Make a hash table for glyph-string. */
+ {
+ Lisp_Object args[6];
+ extern Lisp_Object QCsize;
+
+ args[0] = QCtest;
+ args[1] = Qequal;
+ args[2] = QCweakness;
+ args[3] = Qnil;
+ args[4] = QCsize;
+ args[5] = make_number (311);
+ gstring_hash_table = Fmake_hash_table (6, args);
+ staticpro (&gstring_hash_table);
+ }
+
+ staticpro (&gstring_work_headers);
+ gstring_work_headers = Fmake_vector (make_number (8), Qnil);
+ for (i = 0; i < 8; i++)
+ ASET (gstring_work_headers, i, Fmake_vector (make_number (i + 2), Qnil));
+ staticpro (&gstring_work);
+ gstring_work = Fmake_vector (make_number (10), Qnil);
+
/* Text property `composition' should be nonsticky by default. */
Vtext_property_default_nonsticky
= Fcons (Fcons (Qcomposition, Qt), Vtext_property_default_nonsticky);
string. */);
Vauto_composition_function = Qnil;
+ DEFVAR_LISP ("composition-function-table", &Vcomposition_function_table,
+ doc: /* Char-able of functions for automatic character composition.
+For each character that has to be composed automatically with
+preceding and/or following characters, this char-table contains
+a function to call to compose that character.
+
+The element at index C in the table, if non-nil, is a list of
+this form: ([PATTERN PREV-CHARS FUNC] ...)
+
+PATTERN is a regular expression with which C and the surrounding
+characters must match.
+
+PREV-CHARS is a number of characters before C to check the
+matching with PATTERN. If it is 0, PATTERN must match with C and
+the following characters. If it is 1, PATTERN must match with a
+character before C and the following characters.
+
+If PREV-CHARS is 0, PATTERN can be nil, which means that the
+single character C should be composed.
+
+FUNC is a function to return a glyph-string representing a
+composition of the characters matching with PATTERN. It is
+called with one argument GSTRING.
+
+GSTRING is a template of a glyph-string to return. It is already
+filled with a proper header for the characters to compose, and
+glyphs corresponding to those characters one by one. The
+function must return a new glyph-string of the same header as
+GSTRING, or modify GSTRING itself and return it.
+
+See also the documentation of `auto-composition-mode'. */);
+ Vcomposition_function_table = Fmake_char_table (Qnil, Qnil);
+
defsubr (&Scompose_region_internal);
defsubr (&Scompose_string_internal);
defsubr (&Sfind_composition_internal);
+ defsubr (&Scomposition_get_gstring);
}
/* arch-tag: 79cefaf8-ca48-4eed-97e5-d5afb290d272
projects / emacs.git / commitdiff