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#ifndef lint |
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static const char RCSid[] = "$Id: font.c,v 2.23 2021/11/20 15:53:24 greg Exp $"; |
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#endif |
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/* |
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* Polygonal font handling routines |
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*/ |
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|
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#include "copyright.h" |
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|
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#include <stdlib.h> |
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|
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#include "paths.h" |
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#include "rtio.h" |
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#include "rterror.h" |
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#include "font.h" |
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|
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#define galloc(nv) (GLYPH *)malloc(sizeof(GLYPH)+2*sizeof(GORD)*(nv)) |
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|
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int retainfonts = 0; /* retain loaded fonts? */ |
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|
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static FONT *fontlist = NULL; /* list of loaded fonts */ |
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|
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|
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FONT * |
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getfont( /* return font fname */ |
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char *fname |
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) |
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{ |
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char embuf[512]; |
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FILE *fp; |
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char *pathname, *err = NULL; |
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unsigned wsum, hsum, ngly; |
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int gn, ngv, gv; |
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GLYPH *g; |
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GORD *gp; |
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FONT *f; |
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|
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for (f = fontlist; f != NULL; f = f->next) |
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if (!strcmp(f->name, fname)) { |
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f->nref++; |
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return(f); |
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} |
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/* load the font file */ |
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if ((pathname = getpath(fname, getrlibpath(), R_OK)) == NULL) { |
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sprintf(embuf, "cannot find font file \"%s\"\n", fname); |
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eputs(embuf); |
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return(NULL); |
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} |
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if ((fp = fopen(pathname, "r")) == NULL) { |
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sprintf(embuf, "cannot open font file \"%s\"\n", pathname); |
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eputs(embuf); |
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return(NULL); |
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} |
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f = (FONT *)calloc(1, sizeof(FONT)); |
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if (f == NULL) |
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goto memerr; |
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strcpy(f->name, fname); |
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f->nref = 1; |
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wsum = hsum = ngly = 0; /* get each glyph */ |
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while ((ngv = fgetval(fp, 'i', (char *)&gn)) != EOF) { |
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if (ngv == 0) |
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goto nonint; |
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if (gn < 1 || gn > 255) { |
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err = "illegal"; |
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goto fonterr; |
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} |
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if (f->fg[gn] != NULL) { |
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err = "duplicate"; |
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goto fonterr; |
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} |
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if (fgetval(fp, 'i', (char *)&ngv) <= 0 || |
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ngv < 0 || ngv > 32000) { |
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err = "bad # vertices for"; |
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goto fonterr; |
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} |
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g = galloc(ngv); |
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if (g == NULL) |
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goto memerr; |
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g->nverts = ngv; |
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g->left = g->right = g->top = g->bottom = 128; |
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ngv *= 2; |
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gp = gvlist(g); |
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while (ngv--) { |
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if (fgetval(fp, 'i', (char *)&gv) <= 0 || |
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gv < 0 || gv > 255) { |
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err = "bad vertex for"; |
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goto fonterr; |
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} |
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*gp++ = gv; |
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if (ngv & 1) { /* follow x limits */ |
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if (gv < g->left) |
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g->left = gv; |
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else if (gv > g->right) |
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g->right = gv; |
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} else { /* follow y limits */ |
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if (gv < g->bottom) |
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g->bottom = gv; |
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else if (gv > g->top) |
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g->top = gv; |
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} |
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} |
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if (g->right - g->left && g->top - g->bottom) { |
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ngly++; |
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wsum += g->right - g->left; |
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hsum += g->top - g->bottom; |
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} |
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f->fg[gn] = g; |
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} |
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fclose(fp); |
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if (ngly) { |
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f->mwidth = wsum / ngly; |
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f->mheight = hsum / ngly; |
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} |
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f->next = fontlist; |
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return(fontlist = f); |
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nonint: |
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sprintf(embuf, "non-integer in font file \"%s\"\n", pathname); |
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eputs(embuf); |
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fclose(fp); |
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return(NULL); |
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fonterr: |
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sprintf(embuf, "%s character (%d) in font file \"%s\"\n", |
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err, gn, pathname); |
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eputs(embuf); |
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fclose(fp); |
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return(NULL); |
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memerr: |
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eputs("out of memory in getfont()\n"); |
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fclose(fp); |
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return(NULL); |
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} |
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|
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|
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void |
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freefont( /* release a font (free all if NULL) */ |
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FONT *fnt |
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) |
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{ |
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FONT head; |
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FONT *fl, *f; |
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int i; |
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/* check reference count */ |
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if (fnt != NULL && ((fnt->nref-- > 1) | retainfonts)) |
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return; |
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head.next = fontlist; |
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fl = &head; |
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while ((f = fl->next) != NULL) |
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if ((fnt == NULL) | (fnt == f)) { |
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fl->next = f->next; |
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for (i = 0; i < 256; i++) |
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if (f->fg[i] != NULL) |
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free((void *)f->fg[i]); |
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free((void *)f); |
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} else |
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fl = f; |
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fontlist = head.next; |
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} |
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|
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|
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int |
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uniftext( /* uniformly space text line */ |
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short *sp, /* returned character spacing */ |
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char *tp, /* text line */ |
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FONT *f /* font */ |
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) |
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{ |
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int linelen; |
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|
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linelen = *sp++ = 0; |
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while (*tp) |
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if (f->fg[*tp++&0xff] == NULL) |
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*sp++ = 0; |
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else |
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linelen += *sp++ = 255; |
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return(linelen); |
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} |
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|
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|
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int |
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squeeztext( /* squeeze text line */ |
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short *sp, /* returned character spacing */ |
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char *tp, /* text line */ |
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FONT *f, /* font */ |
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int cis /* intercharacter spacing */ |
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) |
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{ |
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int linelen; |
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GLYPH *gp; |
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|
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linelen = 0; |
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gp = NULL; |
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while (*tp && (gp = f->fg[*tp++&0xff]) == NULL) |
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*sp++ = 0; |
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cis /= 2; |
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*sp = cis; |
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while (gp != NULL) { |
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if (gp->nverts) { /* regular character */ |
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linelen += *sp++ += cis - gp->left; |
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*sp = gp->right + cis; |
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} else { /* space */ |
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linelen += *sp++; |
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*sp = f->mwidth; |
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} |
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gp = NULL; |
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while (*tp && (gp = f->fg[*tp++&0xff]) == NULL) { |
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linelen += *sp++; |
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*sp = 0; |
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} |
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} |
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linelen += *sp += cis; |
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return(linelen); |
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} |
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|
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|
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int |
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proptext( /* space line proportionally */ |
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short *sp, /* returned character spacing */ |
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char *tp, /* text line */ |
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FONT *f, /* font */ |
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int cis, /* target intercharacter spacing */ |
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int nsi /* minimum number of spaces for indent */ |
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) |
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{ |
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char *end, *tab = NULL; |
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GLYPH *gp; |
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short *nsp; |
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int alen, len, width; |
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/* start by squeezing it */ |
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squeeztext(sp, tp, f, cis); |
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/* now, realign spacing */ |
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width = *sp++; |
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while (*tp) { |
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len = alen = 0; |
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nsp = sp; |
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for (end = tp; *end; end = tab) { |
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tab = end + 1; |
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alen += *nsp++; |
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if (f->fg[*end&0xff]) { |
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while ((gp = f->fg[*tab&0xff]) != NULL && |
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gp->nverts == 0) { /* tab in */ |
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alen += *nsp++; |
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tab++; |
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} |
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len += tab - end; |
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} |
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if (nsi && tab - end > nsi) |
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break; |
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} |
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len *= f->mwidth + cis; /* compute target length */ |
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width += len; |
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len -= alen; /* necessary adjustment */ |
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while (sp < nsp) { |
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alen = len/(nsp-sp); |
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*sp++ += alen; |
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len -= alen; |
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} |
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tp = tab; |
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} |
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return(width); |
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} |
