xftxlfd.c revision de3c0529 
1/*
2 * Copyright © 2000 Keith Packard
3 *
4 * Permission to use, copy, modify, distribute, and sell this software and its
5 * documentation for any purpose is hereby granted without fee, provided that
6 * the above copyright notice appear in all copies and that both that
7 * copyright notice and this permission notice appear in supporting
8 * documentation, and that the name of Keith Packard not be used in
9 * advertising or publicity pertaining to distribution of the software without
10 * specific, written prior permission.  Keith Packard makes no
11 * representations about the suitability of this software for any purpose.  It
12 * is provided "as is" without express or implied warranty.
13 *
14 * KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
15 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
16 * EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR
17 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
18 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
19 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
20 * PERFORMANCE OF THIS SOFTWARE.
21 */
22
23#include "xftint.h"
24
25static XftSymbolic XftXlfdWeights[] = {
26    {	"light",    FC_WEIGHT_LIGHT	},
27    {	"medium",   FC_WEIGHT_MEDIUM	},
28    {	"regular",  FC_WEIGHT_MEDIUM	},
29    {	"demibold", FC_WEIGHT_DEMIBOLD },
30    {	"bold",	    FC_WEIGHT_BOLD	},
31    {	"black",    FC_WEIGHT_BLACK	},
32};
33
34#define NUM_XLFD_WEIGHTS    (sizeof XftXlfdWeights/sizeof XftXlfdWeights[0])
35
36static XftSymbolic XftXlfdSlants[] = {
37    {	"r",	    FC_SLANT_ROMAN	},
38    {	"i",	    FC_SLANT_ITALIC	},
39    {	"o",	    FC_SLANT_OBLIQUE	},
40};
41
42#define NUM_XLFD_SLANTS    (sizeof XftXlfdSlants/sizeof XftXlfdSlants[0])
43
44/*
45 * Cut out one XLFD field, placing it in 'save' and return
46 * the start of 'save'
47 */
48static char *
49XftSplitStr (const char *field, char *save)
50{
51    char    *s = save;
52    char    c;
53
54    while (*field)
55    {
56	if (*field == '-')
57	    break;
58	c = *field++;
59	*save++ = c;
60    }
61    *save = 0;
62    return s;
63}
64
65/*
66 * convert one XLFD numeric field.  Return -1 if the field is '*'
67 */
68
69static const char *
70XftGetInt(const char *ptr, int *val)
71{
72    if (*ptr == '*') {
73	*val = -1;
74	ptr++;
75    } else
76	for (*val = 0; *ptr >= '0' && *ptr <= '9';)
77	    *val = *val * 10 + *ptr++ - '0';
78    if (*ptr == '-')
79	return ptr;
80    return (char *) 0;
81}
82
83_X_EXPORT FcPattern *
84XftXlfdParse (const char *xlfd_orig, FcBool ignore_scalable _X_UNUSED, FcBool complete _X_UNUSED)
85{
86    FcPattern	*pat;
87    const char	*xlfd = xlfd_orig;
88    const char	*foundry;
89    const char	*family;
90    const char	*weight_name;
91    const char	*slant;
92    char	*save;
93    int		pixel;
94    int		point;
95    int		resx;
96    int		resy;
97    int		slant_value, weight_value;
98    double	dpixel;
99
100    if (*xlfd != '-')
101	return NULL;
102    if (!(xlfd = strchr (foundry = ++xlfd, '-'))) return NULL;
103    if (!(xlfd = strchr (family = ++xlfd, '-'))) return NULL;
104    if (!(xlfd = strchr (weight_name = ++xlfd, '-'))) return NULL;
105    if (!(xlfd = strchr (slant = ++xlfd, '-'))) return NULL;
106    if (!(xlfd = strchr (/* setwidth_name = */ ++xlfd, '-'))) return NULL;
107    if (!(xlfd = strchr (/* add_style_name = */ ++xlfd, '-'))) return NULL;
108    if (!(xlfd = XftGetInt (++xlfd, &pixel))) return NULL;
109    if (!(xlfd = XftGetInt (++xlfd, &point))) return NULL;
110    if (!(xlfd = XftGetInt (++xlfd, &resx))) return NULL;
111    if (!(xlfd = XftGetInt (++xlfd, &resy))) return NULL;
112    if (!(xlfd = strchr (/* spacing = */ ++xlfd, '-'))) return NULL;
113    if (!(xlfd = strchr (/* average_width = */ ++xlfd, '-'))) return NULL;
114    if (!(xlfd = strchr (/* registry = */ ++xlfd, '-'))) return NULL;
115    /* make sure no fields follow this one */
116    if ((/* xlfd = */ strchr (/* encoding = */ ++xlfd, '-'))) return NULL;
117
118    if (!pixel)
119	return NULL;
120
121    pat = FcPatternCreate ();
122    if (!pat)
123	return NULL;
124
125    save = (char *) malloc (strlen (foundry) + 1);
126
127    if (!save) {
128	FcPatternDestroy (pat);
129	return NULL;
130    }
131
132    if (!FcPatternAddString (pat, XFT_XLFD, (const FcChar8 *) xlfd_orig)) goto bail;
133
134    XftSplitStr (foundry, save);
135    if (save[0] && strcmp (save, "*") != 0)
136	if (!FcPatternAddString (pat, FC_FOUNDRY, (FcChar8 *) save)) goto bail;
137
138    XftSplitStr (family, save);
139    if (save[0] && strcmp (save, "*") != 0)
140	if (!FcPatternAddString (pat, FC_FAMILY, (FcChar8 *) save)) goto bail;
141
142    weight_value = _XftMatchSymbolic (XftXlfdWeights, NUM_XLFD_WEIGHTS,
143				      XftSplitStr (weight_name, save),
144				      FC_WEIGHT_MEDIUM);
145    if (!FcPatternAddInteger (pat, FC_WEIGHT, weight_value))
146	goto bail;
147
148    slant_value = _XftMatchSymbolic (XftXlfdSlants, NUM_XLFD_SLANTS,
149				     XftSplitStr (slant, save),
150				     FC_SLANT_ROMAN);
151    if (!FcPatternAddInteger (pat, FC_SLANT, slant_value))
152	goto bail;
153
154    dpixel = (double) pixel;
155
156    if (point > 0)
157    {
158	if (!FcPatternAddDouble (pat, FC_SIZE, ((double) point) / 10.0)) goto bail;
159	if (pixel <= 0 && resy > 0)
160	{
161	    dpixel = (double) point * (double) resy / 720.0;
162	}
163    }
164
165    if (dpixel > 0)
166	if (!FcPatternAddDouble (pat, FC_PIXEL_SIZE, dpixel)) goto bail;
167
168    free (save);
169    return pat;
170
171bail:
172    free (save);
173    FcPatternDestroy (pat);
174    return NULL;
175}
176