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TeX 1995 July
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TeX CD-ROM July 1995 (Disc 1)(Walnut Creek)(1995).ISO
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font_subr.c
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1990-10-01
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/*
* Copyright (c) 1987 University of Maryland Department of Computer Science.
* All rights reserved. Permission to copy for any purpose is hereby granted
* so long as this copyright notice remains intact.
*/
#ifndef lint
static char rcsid[] = "$Header: font_subr.c,v 2.4 87/06/16 18:28:02 chris Exp $";
#endif
/*
* Subroutines common to all fonts.
*/
#include "font.h"
static struct glyph *freeglyphs;
char *malloc();
extern errno;
/*
* Set up the font structures to note that a font has glyphs in
* the half-open interval [low, high).
*
* SHOULD I ALLOW ADDITIONS TO THE RANGE VIA SUBSEQUENT CALLS TO
* FontHasGlyphs?
*/
FontHasGlyphs(f, low, high)
register struct font *f;
register int low, high;
{
register struct glyph **gp;
/* record bounds */
f->f_lowch = low;
f->f_highch = high;
/*
* Allocate space for all the glyph pointers, and set
* them all to NULL.
*/
if (low >= high) /* no glyphs */
gp = NULL;
else {
gp = (struct glyph **) malloc((unsigned) (high - low) *
sizeof (*gp));
if (gp == NULL)
return (-1);
}
f->f_glybase = gp;
f->f_gly = gp - low;
while (++low <= high)
*gp++ = NULL;
return (0);
}
/*
* AllocGlyph allocates a new glyph. ReleaseGlyph puts one onto the free
* list. We maintain a local list of free glyphs.
*/
#define ReleaseGlyph(g) \
((g)->g_un.g_next = freeglyphs, freeglyphs = (g))
static struct glyph *
AllocGlyph(n)
int n;
{
register struct glyph *g;
register int i;
if ((g = freeglyphs) == NULL) {
g = (struct glyph *) malloc((unsigned) (128 * sizeof (*g)));
if (g == NULL)
error(1, errno, "out of glyph memory");
g += (i = 128);
while (--i >= 0) {
g--;
ReleaseGlyph(g);
}
}
freeglyphs = g->g_un.g_next;
g->g_flags = 0;
g->g_raster = NULL;
g->g_index = n;
return (g);
}
/*
* Free one glyph.
*/
void
FreeGlyph(f, n)
struct font *f;
register int n;
{
register struct glyph *g;
if (n < f->f_lowch || n >= f->f_highch)
return;
#ifdef notdef
(*f->f_ops->fo_freegly)(f, n, n);
#endif
if ((g = f->f_gly[n]) == NULL)
return;
if (g->g_raster != NULL)
free(g->g_raster);
ReleaseGlyph(g);
}
/*
* Free a font.
*/
void
FreeFont(f)
register struct font *f;
{
register struct glyph *g;
register int i;
#ifdef notdef
(*f->f_ops->fo_freegly)(f, f->f_lowch, f->f_highch);
#endif
for (i = f->f_lowch; i < f->f_highch; i++) {
if ((g = f->f_gly[i]) == NULL)
continue;
if (g->g_raster != NULL)
free(g->g_raster);
ReleaseGlyph(g);
}
if (f->f_glybase != NULL)
free((char *) f->f_glybase);
(*f->f_ops->fo_freefont)(f);
free(f->f_path);
free(f->f_font);
free((char *) f);
}
/*
* Get glyph `c' in font `f'. We pull in a few adjacent glyphs here
* under the (perhaps naive) assumption that things will go faster
* that way.
*
* TODO:
* try different adjacency values
* make adjacency a font attribute? (or an op)
*/
#define ADJ 8 /* must be a power of 2 */
#define GET_ADJ(c, l, h) ((h) = ADJ + ((l) = (c) & ~(ADJ - 1)))
struct glyph *
GetGlyph(f, c)
register struct font *f;
int c;
{
register int i, h, l;
GET_ADJ(c, l, h);
if (l < f->f_lowch)
l = f->f_lowch;
if (h > f->f_highch)
h = f->f_highch;
if (l >= h)
return (NULL);
for (i = l; i < h; i++)
if (f->f_gly[i] == NULL)
f->f_gly[i] = AllocGlyph(i);
if ((*f->f_ops->fo_getgly)(f, l, h)) {
/*
* I do not know what to do about this just yet, so:
*/
panic("getgly fails and I am confused ... help!");
}
/*
* Apply the appropriate scale factor to the TFM widths.
* This makes them come out in scaled points, instead of FIXes.
*/
ScaleGlyphs(f, l, h); /* ??? */
return (f->f_gly[c]);
}
/*
* Get the raster for glyph g in font f at rotation r.
*/
char *
GetRaster(g, f, r)
register struct glyph *g;
register struct font *f;
int r;
{
int l, h;
/* abort if caller did not ask for rasters in advance */
if ((f->f_flags & FF_RASTERS) == 0)
panic("GetRaster(%s)", f->f_path);
/*
* If there is no raster, get one. Blank characters,
* however, never have rasters.
*/
if (g->g_raster == NULL) {
if (!HASRASTER(g))
return (NULL);
/*
* THE FOLLOWING DEPENDS ON THE ADJACENCY MATCHING THAT IN
* GetGlyph() ABOVE.
*/
GET_ADJ(g->g_index, l, h);
if (l < f->f_lowch)
l = f->f_lowch;
if (h > f->f_highch)
h = f->f_highch;
if ((*f->f_ops->fo_rasterise)(f, l, h))
error(1, 0, "rasterise fails (out of memory?)");
}
if (g->g_rotation != r)
SetRotation(g, r);
return (g->g_raster);
}
/*
* Return a TeX-style font name, including scale factor.
* SHOULD I BOTHER WITH \magstep STYLE NAMES?
*/
char *
Font_TeXName(f)
register struct font *f;
{
static char result[200];
if (f->f_scaled == 1000)
return (f->f_font);
sprintf(result, "%s scaled %d", f->f_font, f->f_scaled);
return (result);
}