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ca4c9455 KH |
1 | /* Header for composite sequence handler. |
2 | Copyright (C) 1999 Electrotechnical Laboratory, JAPAN. | |
8f924df7 | 3 | Licensed to the Free Software Foundation. |
b5b80599 | 4 | Copyright (C) 2001 Free Software Foundation, Inc. |
8f924df7 | 5 | Copyright (C) 2003 |
9f504898 KH |
6 | National Institute of Advanced Industrial Science and Technology (AIST) |
7 | Registration Number H13PRO009 | |
ca4c9455 KH |
8 | |
9 | This file is part of GNU Emacs. | |
10 | ||
11 | GNU Emacs is free software; you can redistribute it and/or modify | |
12 | it under the terms of the GNU General Public License as published by | |
13 | the Free Software Foundation; either version 2, or (at your option) | |
14 | any later version. | |
15 | ||
16 | GNU Emacs is distributed in the hope that it will be useful, | |
17 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | GNU General Public License for more details. | |
20 | ||
21 | You should have received a copy of the GNU General Public License | |
22 | along with GNU Emacs; see the file COPYING. If not, write to | |
23 | the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
24 | Boston, MA 02111-1307, USA. */ | |
25 | ||
15a10ef1 KH |
26 | #ifndef EMACS_COMPOSITE_H |
27 | #define EMACS_COMPOSITE_H | |
ca4c9455 KH |
28 | |
29 | /* Methods to display a sequence of components a composition. */ | |
30 | enum composition_method { | |
ca4c9455 KH |
31 | /* Compose relatively without alternate characters. */ |
32 | COMPOSITION_RELATIVE, | |
9f504898 KH |
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. */ | |
ca4c9455 KH |
36 | COMPOSITION_WITH_RULE, |
37 | /* Compose relatively with alternate characters. */ | |
38 | COMPOSITION_WITH_ALTCHARS, | |
9f504898 KH |
39 | /* Compose by specified composition rules with alternate characters. */ |
40 | COMPOSITION_WITH_RULE_ALTCHARS, | |
41 | /* This is not a method. */ | |
42 | COMPOSITION_NO | |
ca4c9455 KH |
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 iff 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))) \ | |
c1de6316 | 80 | : CONSP (prop) ? XCDR (prop) : Qnil) |
ca4c9455 KH |
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 iff the composition is valid. It is valid if length of | |
94 | the composition equals to (END - START). */ | |
1f36b2fc GM |
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)))))) \ | |
ca4c9455 KH |
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 | |
28d0edc7 KH |
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; \ | |
ca4c9455 KH |
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 | |
177c0ea7 | 157 | composition and linked in composition_table[ID]. |
ca4c9455 KH |
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 { | |
ca4c9455 | 163 | /* Number of glyphs of the composition components. */ |
28cd4910 | 164 | unsigned glyph_len; |
ca4c9455 | 165 | |
51e31f7a KH |
166 | /* Width, ascent, and descent pixels of the composition. */ |
167 | short pixel_width, ascent, descent; | |
168 | ||
28d0edc7 KH |
169 | short lbearing, rbearing; |
170 | ||
28cd4910 KH |
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 | ||
ca4c9455 KH |
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; | |
ca4c9455 KH |
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; | |
382a2913 KH |
210 | extern Lisp_Object Qauto_composed; |
211 | extern Lisp_Object Vauto_composition_function; | |
212 | extern Lisp_Object Qauto_composition_function; | |
ca4c9455 KH |
213 | |
214 | extern int get_composition_id P_ ((int, int, int, Lisp_Object, Lisp_Object)); | |
72ac5ed6 | 215 | extern int find_composition P_ ((int, int, EMACS_INT *, EMACS_INT *, Lisp_Object *, |
ca4c9455 | 216 | Lisp_Object)); |
72ac5ed6 | 217 | extern void update_compositions P_ ((EMACS_INT, EMACS_INT, int)); |
4a8c194f | 218 | extern void make_composition_value_copy P_ ((Lisp_Object)); |
ca4c9455 KH |
219 | extern void compose_region P_ ((int, int, Lisp_Object, Lisp_Object, |
220 | Lisp_Object)); | |
b5b80599 | 221 | extern void syms_of_composite P_ ((void)); |
f9beddb2 DL |
222 | extern void compose_text P_ ((int, int, Lisp_Object, Lisp_Object, |
223 | Lisp_Object)); | |
c9a7baee | 224 | extern void compose_chars_in_text P_ ((int, int, Lisp_Object)); |
ca4c9455 | 225 | |
15a10ef1 | 226 | #endif /* not EMACS_COMPOSITE_H */ |
6b61353c KH |
227 | |
228 | /* arch-tag: 59524d89-c645-47bd-b5e6-65e861690118 | |
229 | (do not change this comment) */ |