1 /*
2
3 Copyright 1989, 1998 The Open Group
4
5 Permission to use, copy, modify, distribute, and sell this software and its
6 documentation for any purpose is hereby granted without fee, provided that
7 the above copyright notice appear in all copies and that both that
8 copyright notice and this permission notice appear in supporting
9 documentation.
10
11 The above copyright notice and this permission notice shall be included
12 in all copies or substantial portions of the Software.
13
14 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
15 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
16 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
17 IN NO EVENT SHALL THE OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR
18 OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19 ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20 OTHER DEALINGS IN THE SOFTWARE.
21
22 Except as contained in this notice, the name of The Open Group shall
23 not be used in advertising or otherwise to promote the sale, use or
24 other dealings in this Software without prior written authorization
25 from The Open Group.
26
27 */
28 /*
29 * Copyright 1995 by FUJITSU LIMITED
30 * This is source code modified by FUJITSU LIMITED under the Joint
31 * Development Agreement for the CDE/Motif PST.
32 */
33
34
35 #ifdef HAVE_CONFIG_H
36 #include <config.h>
37 #endif
38 #include "Xlibint.h"
39
40 #define min_byte2 min_char_or_byte2
41 #define max_byte2 max_char_or_byte2
42
43
44 /*
45 * CI_GET_ROWZERO_CHAR_INFO_2D - do the same thing as CI_GET_CHAR_INFO_1D,
46 * except that the font has more than one row. This is special case of more
47 * general version used in XTextExt16.c since row == 0. This is used when
48 * max_byte2 is not zero. A further optimization would do the check for
49 * min_byte1 being zero ahead of time.
50 */
51
52 #define CI_GET_ROWZERO_CHAR_INFO_2D(fs,col,def,cs) \
53 { \
54 cs = def; \
55 if (fs->min_byte1 == 0 && \
56 col >= fs->min_byte2 && col <= fs->max_byte2) { \
57 if (fs->per_char == NULL) { \
58 cs = &fs->min_bounds; \
59 } else { \
60 cs = &fs->per_char[(col - fs->min_byte2)]; \
61 if (CI_NONEXISTCHAR(cs)) cs = def; \
62 } \
63 } \
64 }
65
66
67 /*
68 * XTextExtents - compute the extents of string given as a sequences of eight
69 * bit bytes. Since we know that the input characters will always be from the
70 * first row of the font (i.e. byte1 == 0), we can do some optimizations beyond
71 * what is done in XTextExtents16.
72 */
73 int
XTextExtents(XFontStruct * fs,_Xconst char * string,int nchars,int * dir,int * font_ascent,int * font_descent,register XCharStruct * overall)74 XTextExtents (
75 XFontStruct *fs,
76 _Xconst char *string,
77 int nchars,
78 int *dir, /* RETURN font information */
79 int *font_ascent, /* RETURN font information */
80 int *font_descent, /* RETURN font information */
81 register XCharStruct *overall) /* RETURN character information */
82 {
83 int i; /* iterator */
84 Bool singlerow = (fs->max_byte1 == 0); /* optimization */
85 int nfound = 0; /* number of characters found */
86 XCharStruct *def; /* info about default char */
87 unsigned char *us; /* be 8bit clean */
88
89 if (singlerow) { /* optimization */
90 CI_GET_DEFAULT_INFO_1D (fs, def);
91 } else {
92 CI_GET_DEFAULT_INFO_2D (fs, def);
93 }
94
95 *dir = fs->direction;
96 *font_ascent = fs->ascent;
97 *font_descent = fs->descent;
98
99 /*
100 * Iterate over the input string getting the appropriate * char struct.
101 * The default (which may be null if there is no def_char) will be returned
102 * if the character doesn't exist. On the first time * through the loop,
103 * assign the values to overall; otherwise, compute * the new values.
104 */
105
106 for (i = 0, us = (unsigned char *) string; i < nchars; i++, us++) {
107 register unsigned uc = (unsigned) *us; /* since about to do macro */
108 register XCharStruct *cs;
109
110 if (singlerow) { /* optimization */
111 CI_GET_CHAR_INFO_1D (fs, uc, def, cs);
112 } else {
113 CI_GET_ROWZERO_CHAR_INFO_2D (fs, uc, def, cs);
114 }
115
116 if (cs) {
117 if (nfound++ == 0) {
118 *overall = *cs;
119 } else {
120 overall->ascent = max (overall->ascent, cs->ascent);
121 overall->descent = max (overall->descent, cs->descent);
122 overall->lbearing = min (overall->lbearing,
123 overall->width + cs->lbearing);
124 overall->rbearing = max (overall->rbearing,
125 overall->width + cs->rbearing);
126 overall->width += cs->width;
127 }
128 }
129 }
130
131 /*
132 * if there were no characters, then set everything to 0
133 */
134 if (nfound == 0) {
135 overall->width = overall->ascent = overall->descent =
136 overall->lbearing = overall->rbearing = 0;
137 }
138
139 return 0;
140 }
141
142
143 /*
144 * XTextWidth - compute the width of a string of eightbit bytes. This is a
145 * subset of XTextExtents.
146 */
147 int
XTextWidth(XFontStruct * fs,_Xconst char * string,int count)148 XTextWidth (
149 XFontStruct *fs,
150 _Xconst char *string,
151 int count)
152 {
153 int i; /* iterator */
154 Bool singlerow = (fs->max_byte1 == 0); /* optimization */
155 XCharStruct *def; /* info about default char */
156 unsigned char *us; /* be 8bit clean */
157 int width = 0; /* RETURN value */
158
159 if (singlerow) { /* optimization */
160 CI_GET_DEFAULT_INFO_1D (fs, def);
161 } else {
162 CI_GET_DEFAULT_INFO_2D (fs, def);
163 }
164
165 if (def && fs->min_bounds.width == fs->max_bounds.width)
166 return (fs->min_bounds.width * count);
167
168 /*
169 * Iterate over all character in the input string; only consider characters
170 * that exist.
171 */
172 for (i = 0, us = (unsigned char *) string; i < count; i++, us++) {
173 register unsigned uc = (unsigned) *us; /* since about to do macro */
174 register XCharStruct *cs;
175
176 if (singlerow) { /* optimization */
177 CI_GET_CHAR_INFO_1D (fs, uc, def, cs);
178 } else {
179 CI_GET_ROWZERO_CHAR_INFO_2D (fs, uc, def, cs);
180 }
181
182 if (cs) width += cs->width;
183 }
184
185 return width;
186 }
187
188
189
190 /*
191 * _XTextHeight - compute the height of a string of eightbit bytes.
192 */
193 int
_XTextHeight(XFontStruct * fs,_Xconst char * string,int count)194 _XTextHeight (
195 XFontStruct *fs,
196 _Xconst char *string,
197 int count)
198 {
199 int i; /* iterator */
200 Bool singlerow = (fs->max_byte1 == 0); /* optimization */
201 XCharStruct *def; /* info about default char */
202 unsigned char *us; /* be 8bit clean */
203 int height = 0; /* RETURN value */
204
205 if (singlerow) { /* optimization */
206 CI_GET_DEFAULT_INFO_1D (fs, def);
207 } else {
208 CI_GET_DEFAULT_INFO_2D (fs, def);
209 }
210
211 if (def && (fs->min_bounds.ascent == fs->max_bounds.ascent)
212 && (fs->min_bounds.descent == fs->max_bounds.descent))
213 return ((fs->min_bounds.ascent + fs->min_bounds.descent) * count);
214
215 /*
216 * Iterate over all character in the input string; only consider characters
217 * that exist.
218 */
219 for (i = 0, us = (unsigned char *) string; i < count; i++, us++) {
220 register unsigned uc = (unsigned) *us; /* since about to do macro */
221 register XCharStruct *cs;
222
223 if (singlerow) { /* optimization */
224 CI_GET_CHAR_INFO_1D (fs, uc, def, cs);
225 } else {
226 CI_GET_ROWZERO_CHAR_INFO_2D (fs, uc, def, cs);
227 }
228
229 if (cs) height += (cs->ascent + cs->descent);
230 }
231
232 return height;
233 }
234
235