src/px/psign.c

/* Copyright (c) 1991 Regents of the University of California */

#ifndef lint
static char SCCSid[] = "$SunId$ LBL";
#endif

/*
 *  psign.c - produce picture from text.
 *
 *      7/1/87
 */

#include  "standard.h"

#include  "color.h"

#include  "font.h"

#ifndef  SSS
#define  SSS                    3       /* super-sample size */
#endif

#define  MAXLINE                512     /* longest allowable line */

#ifndef  DEFPATH
#define  DEFPATH                ":/usr/local/lib/ray"
#endif
#ifndef  ULIBVAR
#define  ULIBVAR                "RAYPATH"
#endif

char  *fontfile = "helvet.fnt";         /* our font file */

COLOR  bgcolor = WHTCOLOR;              /* background color */
COLOR  fgcolor = BLKCOLOR;              /* foreground color */

int  direct = 'r';                      /* direction (right, up, left, down) */

int  cheight = 32*SSS;                  /* character height */
double  aspect = 1.67;                  /* height/width character aspect */
int  cwidth;                            /* computed character width */

unsigned char  *ourbitmap;              /* our output bitmap */
int  xsiz, ysiz;                        /* bitmap dimensions */
int  xdim;                              /* size of horizontal scan (bytes) */

#define  bitop(x,y,op)          (ourbitmap[(y)*xdim+((x)>>3)] op (1<<((x)&7)))
#define  tstbit(x,y)            bitop(x,y,&)
#define  setbit(x,y)            bitop(x,y,|=)
#define  clrbit(x,y)            bitop(x,y,&=~)
#define  tglbit(x,y)            bitop(x,y,^=)

FONT  *ourfont;                         /* our font */

char  *libpath;                         /* library search path */

typedef struct line {
        char  *s;               /* line w/o LF */
        short  *sp;             /* character spacing */
        struct line  *next;     /* next line up */
} LINE;

LINE  *ourtext;                         /* our text */
int  nlines, maxline;                   /* text dimensions */
int  maxwidth;                          /* maximum line width (dvi) */

extern char  *getenv();
extern char  *malloc(), *calloc();


main(argc, argv)
int  argc;
char  *argv[];
{
        int  an;

        for (an = 1; an < argc && argv[an][0] == '-'; an++)
                switch (argv[an][1]) {
                case 'c':                       /* color */
                        switch (argv[an][2]) {
                        case 'f':                       /* foreground */
                                setcolor(fgcolor, atof(argv[an+1]),
                                                atof(argv[an+2]),
                                                atof(argv[an+3]));
                                an += 3;
                                break;
                        case 'b':                       /* background */
                                setcolor(bgcolor, atof(argv[an+1]),
                                                atof(argv[an+2]),
                                                atof(argv[an+3]));
                                an += 3;
                                break;
                        default:
                                goto unkopt;
                        }
                        break;
                case 'f':                       /* font */
                        fontfile = argv[++an];
                        break;
                case 'd':                       /* direction */
                        switch (argv[an][2]) {
                        case 'r':                       /* right */
                        case 'u':                       /* up */
                        case 'l':                       /* left */
                        case 'd':                       /* down */
                                direct = argv[an][2];
                                break;
                        default:
                                goto unkopt;
                        }
                        break;
                case 'h':                       /* height of characters */
                        cheight = atoi(argv[++an])*SSS;
                        break;
                case 'a':                       /* aspect ratio */
                        aspect = atof(argv[++an]);
                        break;
                default:;
unkopt:
                        fprintf(stderr, "%s: unknown option: %s\n",
                                        argv[0], argv[an]);
                        exit(1);
                }
                                        /* load font file */
        if ((libpath = getenv(ULIBVAR)) == NULL)
                libpath = DEFPATH;
        ourfont = getfont(fontfile);
                                        /* get text */
        if (an == argc)
                gettext(stdin);
        else
                arg_text(argc-an, argv+an);

                                        /* create bit map */
        makemap();
                                        /* convert text to bitmap */
        maptext();
                                        /* print header */
        printargs(argc, argv, stdout);
        fputformat(COLRFMT, stdout);
        putchar('\n');
                                        /* write out bitmap */
        writemap(stdout);

        exit(0);
}


makemap()                       /* create the bit map */
{
        cwidth = cheight/aspect + 0.5;
        if (direct == 'r' || direct == 'l') {
                xsiz = (long)maxwidth*cwidth >> 8;
                ysiz = nlines*cheight;
        } else {                        /* reverse orientation */
                xsiz = nlines*cheight;
                ysiz = (long)maxwidth*cwidth >> 8;
        }
        if (xsiz % SSS)
                xsiz += SSS - xsiz%SSS;
        if (ysiz % SSS)
                ysiz += SSS - ysiz%SSS;
        xdim = (xsiz+7)/8;
        ourbitmap = (BYTE *)calloc(ysiz, xdim);
        if (ourbitmap == NULL)
                error(SYSTEM, "Out of memory in makemap");
}


gettext(fp)                     /* get text from a file */
FILE  *fp;
{
        char  *fgets();
        char  buf[MAXLINE];
        register LINE  *curl;
        int  len;

        maxline = 0;
        maxwidth = 0;
        nlines = 0;
        while (fgets(buf, MAXLINE, fp) != NULL) {
                curl = (LINE *)malloc(sizeof(LINE));
                if (curl == NULL)
                        goto memerr;
                len = strlen(buf);
                curl->s = malloc(len);
                curl->sp = (short *)malloc(sizeof(short)*len--);
                if (curl->s == NULL | curl->sp == NULL)
                        goto memerr;
                if (len > maxline)
                        maxline = len;
                strncpy(curl->s, buf, len);
                curl->s[len] = '\0';
len = uniftext(curl->sp, curl->s, ourfont);
                if (len > maxwidth)
                        maxwidth = len;
                curl->next = ourtext;
                ourtext = curl;
                nlines++;
        }
        return;
memerr:
        error(SYSTEM, "Out of memory in gettext");
}


arg_text(ac, av)                        /* get text from arguments */
int  ac;
char  *av[];
{
        register char  *cp;

        ourtext = (LINE *)malloc(sizeof(LINE));
        if (ourtext == NULL)
                goto memerr;
        ourtext->s = malloc(MAXLINE);
        if (ourtext->s == NULL)
                goto memerr;
        for (cp = ourtext->s; ac-- > 0; av++) {
                strcpy(cp, *av);
                cp += strlen(*av);
                *cp++ = ' ';
        }
        *--cp = '\0';
        ourtext->next = NULL;
        maxline = strlen(ourtext->s);
        ourtext->sp = (short *)malloc(sizeof(short)*(maxline+1));
        if (ourtext->sp == NULL)
                goto memerr;
maxwidth = squeeztext(ourtext->sp, ourtext->s, ourfont, 50);
        nlines = 1;
        return;
memerr:
        error(SYSTEM, "Out of memory in arg_text");
}


maptext()                       /* map our text */
{
        register LINE  *curl;
        int  l, len;
        register int  i, c;

        for (l = 0, curl = ourtext; curl != NULL; l += 256, curl = curl->next) {
                len = strlen(curl->s); c = 0;
                for (i = 0; i < len; i++) {
                        c += curl->sp[i];
                        mapglyph(ourfont->fg[curl->s[i]&0xff], c, l);
                }
        }
}


mapglyph(gl, tx0, ty0)          /* convert a glyph */
GLYPH  *gl;
int  tx0, ty0;
{
        int  n;
        register GORD  *gp;
        int  p0[2], p1[2];

        if (gl == NULL)
                return;

        n = gl->nverts;
        gp = gvlist(gl);
        mapcoord(p0, gp[2*n-2]+tx0, gp[2*n-1]+ty0);
        while (n--) {
                mapcoord(p1, gp[0]+tx0, gp[1]+ty0);
                mapedge(p0[0], p0[1], p1[0]-p0[0], p1[1]-p0[1]);
                p0[0] = p1[0]; p0[1] = p1[1];
                gp += 2;
        }
}


mapcoord(p, tx, ty)             /* map text to picture coordinates */
int  p[2], tx, ty;
{
        tx = (long)tx*cwidth >> 8;
        ty = (long)ty*cheight >> 8;

        switch (direct) {
        case 'r':                       /* right */
                p[0] = tx;
                p[1] = ty;
                return;
        case 'u':                       /* up */
                p[0] = xsiz-1-ty;
                p[1] = tx;
                return;
        case 'l':                       /* left */
                p[0] = xsiz-1-tx;
                p[1] = ysiz-1-ty;
                return;
        case 'd':                       /* down */
                p[0] = ty;
                p[1] = ysiz-1-tx;
                return;
        }
}


mapedge(x, y, run, rise)                /* map an edge */
register int  x, y;
int  run, rise;
{
        int  xstep;
        int  rise2, run2;
        int  n;

        if (rise == 0)
                return;
                                                /* always draw up */
        if (rise < 0) {
                x += run;
                y += rise;
                rise = -rise;
                run = -run;
        }
        if (run < 0) {
                xstep = -1;
                run = -run;
        } else
                xstep = 1;
        n = rise;
        run2 = rise2 = 0;
        while (n)
                if (rise2 >= run2) {
                        tglbit(x, y);
                        n--;
                        y++;
                        run2 += run;
                } else {
                        x += xstep;
                        rise2 += rise;
                }
}


writemap(fp)                    /* write out bitmap */
FILE  *fp;
{
        COLR  pixval[SSS*SSS+1];        /* possible pixel values */
        COLOR  ctmp0, ctmp1;
        double  d;
        COLR  *scanout;
        int  x, y;
        register int  i, j;
        int  cnt;
        register int  inglyph;

        fprintf(fp, "-Y %d +X %d\n", ysiz/SSS, xsiz/SSS);

        scanout = (COLR *)malloc(xsiz/SSS*sizeof(COLR));
        if (scanout == NULL)
                error(SYSTEM, "Out of memory in writemap");
        for (i = 0; i <= SSS*SSS; i++) {        /* compute possible values */
                copycolor(ctmp0, fgcolor);
                d = (double)i/(SSS*SSS);
                scalecolor(ctmp0, d);
                copycolor(ctmp1, bgcolor);
                d = 1.0 - d;
                scalecolor(ctmp1, d);
                addcolor(ctmp0, ctmp1);
                setcolr(pixval[i], colval(ctmp0,RED),
                                colval(ctmp0,GRN), colval(ctmp0,BLU));
        }
        for (y = ysiz/SSS-1; y >= 0; y--) {
                inglyph = 0;
                for (x = 0; x < xsiz/SSS; x++) {
                        cnt = 0;
                        for (j = 0; j < SSS; j++)
                                for (i = 0; i < SSS; i++) {
                                        if (tstbit(x*SSS+i, y*SSS+j))
                                                inglyph ^= 1<<j;
                                        if (inglyph & 1<<j)
                                                cnt++;
                                }
                        copycolr(scanout[x], pixval[cnt]);
                }
                if (fwritecolrs(scanout, xsiz/SSS, fp) < 0) {
                        fprintf(stderr, "write error in writemap\n");
                        exit(1);
                }
        }
        free((char *)scanout);
}
Revision:	2.5
Committed:	Tue Jun 16 16:27:37 1992 UTC (32 years, 4 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.4:	+52 -34 lines
Log Message:	added super-sampling for anti-aliasing of text
#	User	Rev	Content
1	greg	1.3	/* Copyright (c) 1991 Regents of the University of California */
2	greg	1.1
3			#ifndef lint
4			static char SCCSid[] = "$SunId$ LBL";
5			#endif
6
7			/*
8			* psign.c - produce picture from text.
9			*
10			* 7/1/87
11			*/
12
13	greg	2.3	#include "standard.h"
14	greg	1.1
15			#include "color.h"
16
17	greg	2.3	#include "font.h"
18
19	greg	2.5	#ifndef SSS
20			#define SSS 3 /* super-sample size */
21			#endif
22	greg	2.4
23	greg	1.1	#define MAXLINE 512 /* longest allowable line */
24
25	greg	2.3	#ifndef DEFPATH
26			#define DEFPATH ":/usr/local/lib/ray"
27			#endif
28			#ifndef ULIBVAR
29			#define ULIBVAR "RAYPATH"
30			#endif
31
32	greg	1.2	char fontfile = "helvet.fnt"; / our font file */
33	greg	1.1
34	greg	2.5	COLOR bgcolor = WHTCOLOR; /* background color */
35			COLOR fgcolor = BLKCOLOR; /* foreground color */
36	greg	1.1
37			int direct = 'r'; /* direction (right, up, left, down) */
38
39	greg	2.5	int cheight = 32SSS; / character height */
40	greg	1.1	double aspect = 1.67; /* height/width character aspect */
41			int cwidth; /* computed character width */
42
43			unsigned char ourbitmap; / our output bitmap */
44			int xsiz, ysiz; /* bitmap dimensions */
45			int xdim; /* size of horizontal scan (bytes) */
46
47			#define bitop(x,y,op) (ourbitmap[(y)*xdim+((x)>>3)] op (1<<((x)&7)))
48			#define tstbit(x,y) bitop(x,y,&)
49			#define setbit(x,y) bitop(x,y,\|=)
50			#define clrbit(x,y) bitop(x,y,&=~)
51			#define tglbit(x,y) bitop(x,y,^=)
52
53	greg	2.3	FONT ourfont; / our font */
54	greg	1.1
55	greg	2.3	char libpath; / library search path */
56
57	greg	1.1	typedef struct line {
58			char s; / line w/o LF */
59	greg	2.4	short sp; / character spacing */
60	greg	1.1	struct line next; / next line up */
61			} LINE;
62
63			LINE ourtext; / our text */
64			int nlines, maxline; /* text dimensions */
65	greg	2.4	int maxwidth; /* maximum line width (dvi) */
66	greg	1.1
67	greg	2.3	extern char *getenv();
68	greg	1.2	extern char malloc(), calloc();
69	greg	1.1
70
71			main(argc, argv)
72			int argc;
73			char *argv[];
74			{
75			int an;
76
77			for (an = 1; an < argc && argv[an][0] == '-'; an++)
78			switch (argv[an][1]) {
79			case 'c': /* color */
80			switch (argv[an][2]) {
81			case 'f': /* foreground */
82	greg	2.5	setcolor(fgcolor, atof(argv[an+1]),
83	greg	1.1	atof(argv[an+2]),
84			atof(argv[an+3]));
85			an += 3;
86			break;
87			case 'b': /* background */
88	greg	2.5	setcolor(bgcolor, atof(argv[an+1]),
89	greg	1.1	atof(argv[an+2]),
90			atof(argv[an+3]));
91			an += 3;
92			break;
93			default:
94			goto unkopt;
95			}
96			break;
97			case 'f': /* font */
98			fontfile = argv[++an];
99			break;
100			case 'd': /* direction */
101			switch (argv[an][2]) {
102			case 'r': /* right */
103			case 'u': /* up */
104			case 'l': /* left */
105			case 'd': /* down */
106			direct = argv[an][2];
107			break;
108			default:
109			goto unkopt;
110			}
111			break;
112			case 'h': /* height of characters */
113	greg	2.5	cheight = atoi(argv[++an])*SSS;
114	greg	1.1	break;
115			case 'a': /* aspect ratio */
116			aspect = atof(argv[++an]);
117			break;
118			default:;
119			unkopt:
120			fprintf(stderr, "%s: unknown option: %s\n",
121			argv[0], argv[an]);
122			exit(1);
123			}
124	greg	2.4	/* load font file */
125			if ((libpath = getenv(ULIBVAR)) == NULL)
126			libpath = DEFPATH;
127			ourfont = getfont(fontfile);
128	greg	1.1	/* get text */
129			if (an == argc)
130			gettext(stdin);
131			else
132			arg_text(argc-an, argv+an);
133
134			/* create bit map */
135			makemap();
136			/* convert text to bitmap */
137			maptext();
138			/* print header */
139			printargs(argc, argv, stdout);
140	greg	1.3	fputformat(COLRFMT, stdout);
141			putchar('\n');
142	greg	1.1	/* write out bitmap */
143			writemap(stdout);
144
145			exit(0);
146			}
147
148
149			makemap() /* create the bit map */
150			{
151			cwidth = cheight/aspect + 0.5;
152			if (direct == 'r' \|\| direct == 'l') {
153	greg	2.5	xsiz = (long)maxwidth*cwidth >> 8;
154	greg	1.1	ysiz = nlines*cheight;
155			} else { /* reverse orientation */
156			xsiz = nlines*cheight;
157	greg	2.5	ysiz = (long)maxwidth*cwidth >> 8;
158	greg	1.1	}
159	greg	2.5	if (xsiz % SSS)
160			xsiz += SSS - xsiz%SSS;
161			if (ysiz % SSS)
162			ysiz += SSS - ysiz%SSS;
163	greg	1.1	xdim = (xsiz+7)/8;
164			ourbitmap = (BYTE *)calloc(ysiz, xdim);
165	greg	2.5	if (ourbitmap == NULL)
166			error(SYSTEM, "Out of memory in makemap");
167	greg	1.1	}
168
169
170			gettext(fp) /* get text from a file */
171			FILE *fp;
172			{
173			char *fgets();
174			char buf[MAXLINE];
175			register LINE *curl;
176			int len;
177
178			maxline = 0;
179	greg	2.4	maxwidth = 0;
180	greg	1.1	nlines = 0;
181			while (fgets(buf, MAXLINE, fp) != NULL) {
182			curl = (LINE *)malloc(sizeof(LINE));
183			if (curl == NULL)
184			goto memerr;
185			len = strlen(buf);
186	greg	2.4	curl->s = malloc(len);
187			curl->sp = (short )malloc(sizeof(short)len--);
188			if (curl->s == NULL \| curl->sp == NULL)
189	greg	1.1	goto memerr;
190	greg	2.4	if (len > maxline)
191			maxline = len;
192	greg	1.1	strncpy(curl->s, buf, len);
193			curl->s[len] = '\0';
194	greg	2.4	len = uniftext(curl->sp, curl->s, ourfont);
195			if (len > maxwidth)
196			maxwidth = len;
197	greg	1.1	curl->next = ourtext;
198			ourtext = curl;
199			nlines++;
200			}
201			return;
202			memerr:
203	greg	2.5	error(SYSTEM, "Out of memory in gettext");
204	greg	1.1	}
205
206
207			arg_text(ac, av) /* get text from arguments */
208			int ac;
209			char *av[];
210			{
211			register char *cp;
212
213			ourtext = (LINE *)malloc(sizeof(LINE));
214			if (ourtext == NULL)
215			goto memerr;
216			ourtext->s = malloc(MAXLINE);
217			if (ourtext->s == NULL)
218			goto memerr;
219			for (cp = ourtext->s; ac-- > 0; av++) {
220			strcpy(cp, *av);
221			cp += strlen(*av);
222			*cp++ = ' ';
223			}
224			*--cp = '\0';
225			ourtext->next = NULL;
226			maxline = strlen(ourtext->s);
227	greg	2.4	ourtext->sp = (short )malloc(sizeof(short)(maxline+1));
228			if (ourtext->sp == NULL)
229			goto memerr;
230	greg	2.5	maxwidth = squeeztext(ourtext->sp, ourtext->s, ourfont, 50);
231	greg	1.1	nlines = 1;
232			return;
233			memerr:
234	greg	2.5	error(SYSTEM, "Out of memory in arg_text");
235	greg	1.1	}
236
237
238			maptext() /* map our text */
239			{
240			register LINE *curl;
241	greg	2.4	int l, len;
242			register int i, c;
243	greg	1.1
244	greg	2.4	for (l = 0, curl = ourtext; curl != NULL; l += 256, curl = curl->next) {
245			len = strlen(curl->s); c = 0;
246			for (i = 0; i < len; i++) {
247			c += curl->sp[i];
248			mapglyph(ourfont->fg[curl->s[i]&0xff], c, l);
249			}
250			}
251	greg	1.1	}
252
253
254			mapglyph(gl, tx0, ty0) /* convert a glyph */
255	greg	2.3	GLYPH *gl;
256	greg	1.1	int tx0, ty0;
257			{
258			int n;
259	greg	2.3	register GORD *gp;
260	greg	1.1	int p0[2], p1[2];
261
262			if (gl == NULL)
263			return;
264
265	greg	2.3	n = gl->nverts;
266			gp = gvlist(gl);
267			mapcoord(p0, gp[2n-2]+tx0, gp[2n-1]+ty0);
268	greg	1.1	while (n--) {
269	greg	2.3	mapcoord(p1, gp[0]+tx0, gp[1]+ty0);
270	greg	1.1	mapedge(p0[0], p0[1], p1[0]-p0[0], p1[1]-p0[1]);
271			p0[0] = p1[0]; p0[1] = p1[1];
272	greg	2.3	gp += 2;
273	greg	1.1	}
274			}
275
276
277			mapcoord(p, tx, ty) /* map text to picture coordinates */
278			int p[2], tx, ty;
279			{
280			tx = (long)tx*cwidth >> 8;
281			ty = (long)ty*cheight >> 8;
282
283			switch (direct) {
284			case 'r': /* right */
285			p[0] = tx;
286			p[1] = ty;
287			return;
288			case 'u': /* up */
289			p[0] = xsiz-1-ty;
290			p[1] = tx;
291			return;
292			case 'l': /* left */
293			p[0] = xsiz-1-tx;
294			p[1] = ysiz-1-ty;
295			return;
296			case 'd': /* down */
297			p[0] = ty;
298			p[1] = ysiz-1-tx;
299			return;
300			}
301			}
302
303
304			mapedge(x, y, run, rise) /* map an edge */
305			register int x, y;
306			int run, rise;
307			{
308			int xstep;
309			int rise2, run2;
310			int n;
311
312			if (rise == 0)
313			return;
314			/* always draw up */
315			if (rise < 0) {
316			x += run;
317			y += rise;
318			rise = -rise;
319			run = -run;
320			}
321			if (run < 0) {
322			xstep = -1;
323			run = -run;
324			} else
325			xstep = 1;
326			n = rise;
327			run2 = rise2 = 0;
328			while (n)
329			if (rise2 >= run2) {
330			tglbit(x, y);
331			n--;
332			y++;
333			run2 += run;
334			} else {
335			x += xstep;
336			rise2 += rise;
337			}
338			}
339
340
341			writemap(fp) /* write out bitmap */
342			FILE *fp;
343			{
344	greg	2.5	COLR pixval[SSSSSS+1]; / possible pixel values */
345			COLOR ctmp0, ctmp1;
346			double d;
347	greg	1.1	COLR *scanout;
348	greg	2.5	int x, y;
349			register int i, j;
350			int cnt;
351	greg	1.1	register int inglyph;
352
353	greg	2.5	fprintf(fp, "-Y %d +X %d\n", ysiz/SSS, xsiz/SSS);
354	greg	1.1
355	greg	2.5	scanout = (COLR )malloc(xsiz/SSSsizeof(COLR));
356			if (scanout == NULL)
357			error(SYSTEM, "Out of memory in writemap");
358			for (i = 0; i <= SSSSSS; i++) { / compute possible values */
359			copycolor(ctmp0, fgcolor);
360			d = (double)i/(SSS*SSS);
361			scalecolor(ctmp0, d);
362			copycolor(ctmp1, bgcolor);
363			d = 1.0 - d;
364			scalecolor(ctmp1, d);
365			addcolor(ctmp0, ctmp1);
366			setcolr(pixval[i], colval(ctmp0,RED),
367			colval(ctmp0,GRN), colval(ctmp0,BLU));
368	greg	1.1	}
369	greg	2.5	for (y = ysiz/SSS-1; y >= 0; y--) {
370	greg	1.1	inglyph = 0;
371	greg	2.5	for (x = 0; x < xsiz/SSS; x++) {
372			cnt = 0;
373			for (j = 0; j < SSS; j++)
374			for (i = 0; i < SSS; i++) {
375			if (tstbit(xSSS+i, ySSS+j))
376			inglyph ^= 1<<j;
377			if (inglyph & 1<<j)
378			cnt++;
379			}
380			copycolr(scanout[x], pixval[cnt]);
381	greg	1.1	}
382	greg	2.5	if (fwritecolrs(scanout, xsiz/SSS, fp) < 0) {
383	greg	1.1	fprintf(stderr, "write error in writemap\n");
384			exit(1);
385			}
386			}
387			free((char *)scanout);
388			}