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/* xscreensaver, Copyright (c) 2018 by Jamie Zawinski <jwz@jwz.org>
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that
* copyright notice and this permission notice appear in supporting
* documentation. No representations are made about the suitability of this
* software for any purpose. It is provided "as is" without express or
* implied warranty.
*/
/* Like XLoadQueryFont, but if it fails, it tries some heuristics to
load something close.
*/
#define _GNU_SOURCE
#include "utils.h"
#include "visual.h"
#include "xft.h"
#include "font-retry.h"
extern const char *progname;
#undef countof
#define countof(x) (sizeof((x))/sizeof((*x)))
#undef DEBUG
static void *
load_font_retry_1 (Display *dpy, int screen, const char *xlfd, Bool xft_p)
{
# ifdef USE_XFT
# define LOADFONT(F) (xft_p \
? (void *) XftFontOpenXlfd (dpy, screen, (F)) \
: (void *) XLoadQueryFont (dpy, (F)))
# else
# define LOADFONT(F) ((void *) XLoadQueryFont (dpy, (F)))
# endif
void *f = xlfd ? LOADFONT(xlfd) : 0;
# ifndef USE_XFT
if (xft_p) abort();
# endif
# ifdef HAVE_JWXYZ
return f;
# else /* !HAVE_JWXYZ */
if (! xlfd) xlfd = "<null>";
if (f)
{
# ifdef DEBUG
fprintf (stderr, "%s: loaded %s\n", progname, xlfd);
# endif
return f;
}
else
{
Bool bold_p = (!!strcasestr (xlfd, "-bold-") ||
!!strcasestr (xlfd, "-ocr"));
Bool italic_p = (!!strcasestr (xlfd, "-i-") ||
!!strcasestr (xlfd, "-o-"));
Bool fixed_p = (!!strcasestr (xlfd, "courier") ||
!!strcasestr (xlfd, "-ocr") ||
!!strcasestr (xlfd, "-m-") ||
!!strcasestr (xlfd, "-c-"));
int size = 0;
# ifdef DEBUG
fprintf (stderr, "%s: failed %s\n", progname, xlfd);
# endif
if (!strcmp (xlfd, "vga")) /* BSOD uses this: it has no XLFD name. */
fixed_p = True, size = 120;
/* Look for the first number in the string like "-180-" */
if (! size)
{
const char *s;
for (s = xlfd; *s; s++)
if (s[0] == '-' && s[1] >= '0' && s[1] <= '9')
{
int i = s[1] - '0';
const char *s2 = s+2;
while (*s2 >= '0' && *s2 <= '9')
{
i = i * 10 + *s2 - '0';
s2++;
}
if (*s2 != '-') continue; /* Number ends with dash */
if (i < 60 || i >= 2000) continue; /* In range 6pt - 200pt */
if (i % 10) continue; /* Multiple of 10 */
size = i;
break;
}
}
if (! size)
{
fprintf (stderr, "%s: unloadable, unparsable font: \"%s\"\n",
progname, xlfd);
xlfd = "fixed";
return LOADFONT(xlfd);
}
else
{
const char *variable[] = {
"helvetica",
"arial",
"bitstream vera sans",
"gill sans",
"times",
"times new roman",
"new century schoolbook",
"utopia",
"palatino",
"lucida",
"bitstream charter",
/* Don't use a wildcard family. If none of the above worked, then
then almost none of the X11 fonts are installed, and it's not
unlikely that "-*-*-medium-r-*-*-*-140-*-*-*-10646-1" will
match an Arabic or or Japanese font that contains no Latin
glyphs at all, even in a Latin locale. So in that case, just
let "helvetica" fall back to "fixed".
*/
/* "*" */
};
const char *fixed[] = {
"courier",
"courier new",
"courier 10 pitch",
"lucidatypewriter",
"american typewriter",
"fixed",
"ocr a std",
/* As above, but "can't happen" because we already tried fixed? */
/* "*" */
};
const char *charsets[] = { "iso10646-1", "iso8859-1", "*-*" };
const char *weights[] = { "bold", "medium" };
const char *slants[] = { "o", "i", "r" };
const char *spacings[] = { "m", "c", "p" };
int a, b, c, d, e, g;
char buf[1024];
for (a = 0; a < countof(charsets); a++)
for (b = (bold_p ? 0 : 1); b < countof(weights); b++)
for (c = (italic_p ? 0 : 2); c < countof(slants); c++)
for (d = 0;
d < (fixed_p ? countof(fixed) : countof(variable));
d++)
for (g = size; g >= 60; g -= 10)
for (e = (fixed_p ? 0 : 2); e < countof(spacings); e++)
{
sprintf (buf,
"-%s-%s-%s-%s-%s-%s-%s-%d-%s-%s-%s-%s-%s",
"*", /* foundry */
(fixed_p ? fixed[d] : variable[d]),
weights[b],
slants[c],
"*", /* set width */
"*", /* add style */
"*", /* pixel size */
g, /* point size */
"*", /* x resolution */
"*", /* y resolution */
spacings[e],
"*", /* average width */
charsets[a]);
# ifdef DEBUG
fprintf(stderr, "%s: trying %s\n", progname, buf);
# endif
f = LOADFONT(buf);
if (f)
{
# ifdef DEBUG
fprintf (stderr,
"%s: substituted \"%s\" for \"%s\"\n",
progname, buf, xlfd);
# endif
return f;
}
}
fprintf (stderr, "%s: unable to find any alternatives to \"%s\"\n",
progname, xlfd);
xlfd = "fixed";
return LOADFONT(xlfd);
}
}
# endif /* !HAVE_JWXYZ */
}
XFontStruct *
load_font_retry (Display *dpy, const char *xlfd)
{
return (XFontStruct *) load_font_retry_1 (dpy, 0, xlfd, 0);
}
#ifdef USE_XFT
XftFont *
load_xft_font_retry (Display *dpy, int screen, const char *xlfd)
{
return (XftFont *) load_font_retry_1 (dpy, screen, xlfd, 1);
}
#elif defined(HAVE_JWXYZ)
XftFont *
load_xft_font_retry (Display *dpy, int screen, const char *xlfd)
{
return XftFontOpenXlfd (dpy, screen, xlfd);
}
#endif /* !HAVE_JWXYZ */
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