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ca4c9455 KH |
1 | /* Header for composite sequence handler. |
2 | Copyright (C) 1999 Electrotechnical Laboratory, JAPAN. | |
3 | Licensed to the Free Software Foundation. | |
4 | ||
5 | This file is part of GNU Emacs. | |
6 | ||
7 | GNU Emacs is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2, or (at your option) | |
10 | any later version. | |
11 | ||
12 | GNU Emacs is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with GNU Emacs; see the file COPYING. If not, write to | |
19 | the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
20 | Boston, MA 02111-1307, USA. */ | |
21 | ||
15a10ef1 KH |
22 | #ifndef EMACS_COMPOSITE_H |
23 | #define EMACS_COMPOSITE_H | |
ca4c9455 KH |
24 | |
25 | /* Methods to display a sequence of components a composition. */ | |
26 | enum composition_method { | |
27 | /* The first two are actually not methods, but used in code | |
28 | conversion to specify the current composing status. */ | |
29 | COMPOSITION_DISABLED, /* Never handle composition data */ | |
30 | COMPOSITION_NO, /* Not processing composition data */ | |
31 | /* Compose relatively without alternate characters. */ | |
32 | COMPOSITION_RELATIVE, | |
33 | /* Compose by specified composition rule. This is not used in Emacs | |
34 | 21 but we need it to decode files saved in the older versions of | |
35 | Emacs. */ | |
36 | COMPOSITION_WITH_RULE, | |
37 | /* Compose relatively with alternate characters. */ | |
38 | COMPOSITION_WITH_ALTCHARS, | |
39 | /* Compose by specified composition rule with alternate characters. */ | |
40 | COMPOSITION_WITH_RULE_ALTCHARS | |
41 | }; | |
42 | ||
43 | /* Maximum number of compoments a single composition can have. */ | |
44 | #define MAX_COMPOSITION_COMPONENTS 16 | |
45 | ||
46 | /* These macros access information about a composition that | |
47 | has `composition' property PROP. PROP is: | |
48 | ((LENGTH . COMPONENTS) . MODIFICATION-FUNC) | |
49 | or | |
50 | (COMPOSITION-ID . (LENGTH COMPONENTS . MODIFICATION-FUNC)) | |
51 | They don't check validity of PROP. */ | |
52 | ||
53 | /* Temporary variable used only in the following macros. */ | |
54 | extern Lisp_Object composition_temp; | |
55 | ||
56 | /* Return 1 iff the composition is already registered. */ | |
57 | #define COMPOSITION_REGISTERD_P(prop) INTEGERP (XCAR (prop)) | |
58 | ||
59 | /* Return ID number of the already registered composition. */ | |
60 | #define COMPOSITION_ID(prop) XINT (XCAR (prop)) | |
61 | ||
62 | /* Return length of the composition. */ | |
63 | #define COMPOSITION_LENGTH(prop) \ | |
64 | (COMPOSITION_REGISTERD_P (prop) \ | |
65 | ? XINT (XCAR (XCDR (prop))) \ | |
66 | : XINT (XCAR (XCAR (prop)))) | |
67 | ||
68 | /* Return components of the composition. */ | |
69 | #define COMPOSITION_COMPONENTS(prop) \ | |
70 | (COMPOSITION_REGISTERD_P (prop) \ | |
71 | ? XCAR (XCDR (XCDR (prop))) \ | |
72 | : XCDR (XCAR (prop))) | |
73 | ||
74 | /* Return modification function of the composition. */ | |
75 | #define COMPOSITION_MODIFICATION_FUNC(prop) \ | |
76 | (COMPOSITION_REGISTERD_P (prop) \ | |
77 | ? XCDR (XCDR (XCDR (prop))) \ | |
78 | : XCDR (prop)) | |
79 | ||
80 | /* Return the method of composition. */ | |
81 | #define COMPOSITION_METHOD(prop) \ | |
82 | (COMPOSITION_REGISTERD_P (prop) \ | |
83 | ? composition_table[COMPOSITION_ID (prop)]->method \ | |
84 | : (composition_temp = XCDR (XCAR (prop)), \ | |
85 | (NILP (composition_temp) \ | |
86 | ? COMPOSITION_RELATIVE \ | |
87 | : ((INTEGERP (composition_temp) || STRINGP (composition_temp)) \ | |
88 | ? COMPOSITION_WITH_ALTCHARS \ | |
89 | : COMPOSITION_WITH_RULE_ALTCHARS)))) | |
90 | ||
91 | /* Return 1 iff the composition is valid. It is valid if length of | |
92 | the composition equals to (END - START). */ | |
93 | #define COMPOSITION_VALID_P(start, end, prop) \ | |
94 | (CONSP (prop) \ | |
95 | && (COMPOSITION_REGISTERD_P (prop) \ | |
96 | ? (COMPOSITION_ID (prop) >= 0 \ | |
97 | && COMPOSITION_ID (prop) <= n_compositions \ | |
98 | && CONSP (XCDR (prop))) \ | |
99 | : (composition_temp = XCAR (prop), \ | |
100 | (CONSP (composition_temp) \ | |
101 | && (composition_temp = XCDR (composition_temp), \ | |
102 | (NILP (composition_temp) || STRINGP (composition_temp) \ | |
103 | || VECTORP (composition_temp) || CONSP (composition_temp))))))\ | |
104 | && (end - start) == COMPOSITION_LENGTH (prop)) | |
105 | ||
106 | /* Return the Nth glyph of composition specified by CMP. CMP is a | |
107 | pointer to `struct composition'. */ | |
108 | #define COMPOSITION_GLYPH(cmp, n) \ | |
109 | XINT (XVECTOR (XVECTOR (XHASH_TABLE (composition_hash_table) \ | |
110 | ->key_and_value) \ | |
111 | ->contents[cmp->hash_index * 2]) \ | |
112 | ->contents[cmp->method == COMPOSITION_WITH_RULE_ALTCHARS \ | |
113 | ? (n) * 2 : (n)]) | |
114 | ||
115 | /* Return the encoded composition rule to compose the Nth glyph of | |
116 | rule-base composition specified by CMP. CMP is a pointer to | |
117 | `struct composition'. */ | |
118 | #define COMPOSITION_RULE(cmp, n) \ | |
119 | XINT (XVECTOR (XVECTOR (XHASH_TABLE (composition_hash_table) \ | |
120 | ->key_and_value) \ | |
121 | ->contents[cmp->hash_index * 2]) \ | |
122 | ->contents[(n) * 2 - 1]) | |
123 | ||
124 | /* Decode encoded composition rule RULE_CODE into GREF (global | |
125 | reference point code) and NREF (new reference point code). Don't | |
126 | check RULE_CODE, always set GREF and NREF to valid values. */ | |
127 | #define COMPOSITION_DECODE_RULE(rule_code, gref, nref) \ | |
128 | do { \ | |
129 | gref = (rule_code) / 12; \ | |
130 | if (gref > 12) gref = 11; \ | |
131 | nref = (rule_code) % 12; \ | |
132 | } while (0) | |
133 | ||
134 | /* Return encoded composition rule for the pair of global reference | |
135 | point GREF and new reference point NREF. If arguments are invalid, | |
136 | return -1. */ | |
137 | #define COMPOSITION_ENCODE_RULE(gref, nref) \ | |
138 | ((unsigned) (gref) < 12 && (unsigned) (nref) < 12 \ | |
139 | ? (gref) * 12 + (nref) : -1) | |
140 | ||
141 | /* Data structure that records information about a composition | |
142 | currently used in some buffers or strings. | |
143 | ||
144 | When a composition is assigned an ID number (by | |
145 | get_composition_id), this structure is allocated for the | |
146 | composition and linked in composition_table[ID]. | |
147 | ||
148 | Identical compositions appearing at different places have the same | |
149 | ID, and thus share the same instance of this structure. */ | |
150 | ||
151 | struct composition { | |
152 | /* How many columns the overall glyphs occupy on the screen. This | |
153 | gives an approximate value for column calculation in | |
154 | Fcurrent_column, and etc. */ | |
155 | unsigned char width; | |
156 | ||
157 | /* Number of glyphs of the composition components. */ | |
158 | unsigned char glyph_len; | |
159 | ||
51e31f7a KH |
160 | /* Width, ascent, and descent pixels of the composition. */ |
161 | short pixel_width, ascent, descent; | |
162 | ||
ca4c9455 KH |
163 | /* Method of the composition. */ |
164 | enum composition_method method; | |
165 | ||
166 | /* Index to the composition hash table. */ | |
167 | int hash_index; | |
168 | ||
169 | /* For which font we have calculated the remaining members. The | |
170 | actual type is device dependent. */ | |
171 | void *font; | |
172 | ||
173 | /* Pointer to an array of x-offset and y-offset (by pixels) of | |
174 | glyphs. This points to a sufficient memory space (sizeof (int) * | |
175 | glyph_len * 2) that is allocated when the composition is | |
176 | registered in composition_table. X-offset and Y-offset of Nth | |
177 | glyph are (2N)th and (2N+1)th elements respectively. */ | |
178 | short *offsets; | |
ca4c9455 KH |
179 | }; |
180 | ||
181 | /* Table of pointers to the structure `composition' indexed by | |
182 | COMPOSITION-ID. */ | |
183 | extern struct composition **composition_table; | |
184 | /* Number of the currently registered compositions. */ | |
185 | extern int n_compositions; | |
186 | ||
187 | /* Mask bits for CHECK_MASK arg to update_compositions. | |
188 | For a change in the region FROM and TO, check compositions ... */ | |
189 | #define CHECK_HEAD 1 /* adjacent to FROM */ | |
190 | #define CHECK_TAIL 2 /* adjacent to TO */ | |
191 | #define CHECK_INSIDE 4 /* between FROM and TO */ | |
192 | #define CHECK_BORDER (CHECK_HEAD | CHECK_TAIL) | |
193 | #define CHECK_ALL (CHECK_BORDER | CHECK_INSIDE) | |
194 | ||
195 | extern Lisp_Object Qcomposition; | |
196 | extern Lisp_Object composition_hash_table; | |
197 | ||
198 | extern int get_composition_id P_ ((int, int, int, Lisp_Object, Lisp_Object)); | |
199 | extern int find_composition P_ ((int, int, int *, int *, Lisp_Object *, | |
200 | Lisp_Object)); | |
201 | extern void update_compositions P_ ((int, int, int)); | |
4a8c194f | 202 | extern void make_composition_value_copy P_ ((Lisp_Object)); |
ca4c9455 KH |
203 | extern void compose_region P_ ((int, int, Lisp_Object, Lisp_Object, |
204 | Lisp_Object)); | |
f9beddb2 DL |
205 | extern void syms_of_composition P_ ((void)); |
206 | extern void compose_text P_ ((int, int, Lisp_Object, Lisp_Object, | |
207 | Lisp_Object)); | |
ca4c9455 | 208 | |
15a10ef1 | 209 | #endif /* not EMACS_COMPOSITE_H */ |