usr/src/cmd/vpr/vfontinfo.c

static char *sccsid = "@(#)vfontinfo.c  4.4 (Berkeley) 5/30/81";
/* Font Information for VCat-style fonts
 *      Andy Hertzfeld  4/79
 *
 *      Modified to print Ascii chars 1/80 by Mark Horton
 *      Zoom option added 5/81 by Steve Stone with tables from Mark Horton.
 *      Message option added 5/31 by Mark Horton
 */
#include <stdio.h>
#include <ctype.h>
#include <vfont.h>

struct header FontHeader;
struct dispatch disptable[256] ;

char    IName[100];
char *  rdchar();
long    fbase;

char    defascii[256];
char    *charswanted = defascii;
int     verbose;
char    charbits[4000];
int     H, W, WB, base;
int     zoom = 1;

char msgout[24][80];
int msgflag = 0;
int curline, curcol;    /* cursor, numbered from lower left corner */
int minline=24, maxline=0, maxcol=0;

main(argc,argv)
int argc;
char **argv;

{
        int FID,i,j;

        while (argc > 1 && argv[1][0] == '-') {
                switch(argv[1][1]) {
                case 'v':
                        verbose++;
                        break;
                case 'z':
                        zoom = argv[1][2] - '0';
                        break;
                case 'm':
                        msgflag = 1;
                        zoom = 2;
                        for (i=0; i<24; i++)
                                for (j=0; j<80; j++)
                                        msgout[i][j] = ' ';
                        curline = 5; curcol = 0;
                        break;
                default:
                        printf("Bad flag: %s\n", argv[1]);
                }
                argc--; argv++;
        }
        if (argc < 2) {
                fprintf(stderr,"Usage: %s filename", argv[0]);
                exit(2);
        }

        for (i=0; i<128; i++)
                defascii[i] = i;
        if (argc >= 3)
                charswanted = argv[2];

        sprintf(IName,"/usr/lib/vfont/%s",argv[1]);
        if ((FID = open(argv[1],0)) < 0)
                if ((FID = open(IName,0)) < 0) {
                        printf("Can't find %s\n",argv[1]);
                        exit(8);
                };

        if (read(FID,&FontHeader,sizeof FontHeader) != sizeof FontHeader)
                error("Bad header in Font file.");

        if (read(FID,&disptable[0],sizeof disptable) != sizeof disptable)
                error("Bad dispatch table in Font file");

        fbase = sizeof FontHeader + sizeof disptable;

        if (FontHeader.magic != 0436)
                printf("Magic number %o wrong\n", FontHeader.magic);
        if (!msgflag) {
                printf("Font %s, ",argv[1]);
                printf("raster size %d, ",FontHeader.size);
                printf("max width %d, max height %d, xtend %d\n",
                        FontHeader.maxx, FontHeader.maxy,FontHeader.xtend);
                printf("\n ASCII     offset    size  left    right   up     down    width \n");
        }

        for (i=0; i<256; i++) {
                j = charswanted[i];
                if (i>0 && j==0)
                        break;
                if (disptable[j].nbytes != 0) {
                        if (!msgflag)
                                printf("  %3o %2s     %4d   %4d   %4d   %4d   %4d   %4d   %5d\n",
                                        j, rdchar(j),
                                        disptable[j].addr,
                                        disptable[j].nbytes,
                                        disptable[j].left,
                                        disptable[j].right,
                                        disptable[j].up,
                                        disptable[j].down,
                                        disptable[j].width);
                        if (verbose || msgflag) {
                                int len = disptable[j].nbytes;
                                int k, l, last;

                                lseek(FID, fbase+disptable[j].addr, 0);
                                read(FID, charbits, len);
                                H = (disptable[j].up) + (disptable[j].down);
                                W = (disptable[j].left) + (disptable[j].right);
                                base = disptable[j].up;
                                WB = (W+7)/8;
                                if (zoom < 0) {
                                        /*
                                         * Old 1 for 1 code.  The aspect ratio
                                         * is awful, so we don't use it.
                                         */
                                        for (k=0; k<H; k++) {
                                                for (last=W-1; last >= 0; last--)
                                                        if (fbit(k, last))
                                                                break;
                                                for (l=0; l<=W-1; l++) {
                                                        printf("%c", fbit(k,l)?'M':' ');
                                                }
                                                printf("\n");
                                        }
                                        printf("\n");
                                } else {
                                        shozoom();
                                        if (msgflag) {
                                                k = disptable[j].width;
                                                if (zoom == 0) k *= 2;
                                                else if (zoom == 2) k /= 2;
                                                curcol += k;
                                        }
                                }
                        }
                }
        }
        if (msgflag) {
                for (i=maxline; i>=minline; i--) {
                        for (j=0; j<maxcol; j++)
                                putchar(msgout[i][j]);
                        putchar('\n');
                }
        }
}

error(string)
char *string;

{
        printf("\nvfontinfo: %s\n",string);
        exit(8);
};

char *rdchar(c)
char c;
{
        static char ret[3];
        ret[0] = isprint(c) ? ' ' : '^';
        ret[1] = isprint(c) ?  c  : c^0100;
        ret[2] = 0;
        return (ret);
}

int
fbit(row, col)
int row, col;
{
        int thisbyte, thisbit, ret;

        if (row<0 || row>=H || col>=W) return(0);
        thisbyte = charbits[row*WB + (col>>3)] & 0xff;
        thisbit = 0x80 >> (col&7);
        ret = thisbyte & thisbit;
        return (ret != 0);
}


/*
The implementation would work like this:
        zoom level      method
        0               2 chars/pixel, 1 is "[]", 0 is "  ".
        1               2 pixels/char 2x1, using " " "," "'" "|"
        2               8 pixels/char 4x2, using 16x16 table
        3               32 pixels/char 8x4, mapped into (2)
        4 and up        similar, mapped into (2)

The 16x16 table maps a 4x2 pattern into a printing ascii character which
most closely approximates that pattern, e.g. the pattern
        |'
        ''
would be represented by the character "[".  I have such a table worked out.

Grainer zoom levels would take the rule of reducing it into a smaller bitmap,
or-ing the bits together.  (e.g. level 3 would take a 2x2 chunk and map it
into a single pixel: 0 if all 4 are 0, 1 otherwise.)  These pixels would be
displayed as in 2.
*/

/*
 * graphtab: a table for rudimentary graphics on ordinary terminals.
 * For each 4x2 bit pattern of the form:
 *      ae
 *      bf
 *      cg
 *      dh
 * form the 4 bit quantities abcd and efgh and get table entry
 *      graphtab[abcd][efgh]
 * to display in that character position.
 *
 * General philosophies: the dh bits are intended for descenders where
 * possible.  Characters with radically different appearance on different
 * terminals (e.g. _ and ^) are avoided.
 *
 * Version 1.0, March 1981, Mark Horton.
 */

char tab1[4] = {
        ' ', ',', '\'', '|'
};

char graphtab[16][16] = {
' ', '.', '.', ',', '.', ';', ':', 'j', '\'', ':', ':', ';', '\'', ';', '!', '|',
'.', '.', ':', ',', ';', ';', ';', 'j', '/', ';', ';', ';', 'j', 'j', 'j', 'j',
'.', ',', '~', ',', 'r', '<', 'j', 'q', '/', ';', 'I', ';', '/', '|', 'I', '|',
',', ',', 'r', 'x', '/', '/', '/', 'd', '/', '/', '/', 'd', '/', '/', '/', 'd',
'.', ':', '\\', ';', '-', '=', 'v', 'q', '\'', ':', '<', '|', '\'', ':', '+', '+',
';', ';', '>', ';', '=', '=', 'g', 'g', '\'', ':', 'S', 'S', '/', '/', '/', '+',
':', '\\', '\\', '\\', 'r', '<', 'w', 'q', '/', '<', '6', '4', '/', '/', 'd', '+',
'l', 'L', '+', 'b', 'y', '[', 'p', 'g', '/', '<', '/', '6', '/', '/', '/', '+',
'`', ':', ':', ';', '`', '\\', '\\', '\\', '"', ':', ':', ';', '`', '\\', 'Y', 'T',
';', ';', ';', ';', '`', '2', '>', '\\', ':', '=', ';', ';', '?', '?', ']', ']',
':', ';', ';', ';', '>', '2', '>', '\\', 'F', ';', 'O', ';', '7', '?', ']', '7',
';', ';', ';', ';', '?', '2', '>', 'b', ';', ';', ';', ';', '?', '?', ']', '#',
'\'', '\\', '\\', '\\', '`', '\\', '\\', '\\', '\'', '\'', '<', '5', '"', '"', 'v', 'q',
';', '\\', '\\', '\\', '`', '=', '\\', '\\', '\'', '\'', '5', '5', '"', '?', 'g', 'g',
'I', 'L', 'L', 'L', 'D', '\\', 'b', 'f', 'F', '[', '[', '[', 'P', '?', '#', 'M',
'|', '|', '|', '|', '|', '#', '+', '#', 'T', '[', 'F', 'F', 'P', '?', 'P', 'M'
};


shozoom()
{
        register i;

        if (zoom == 0)
                sho0();
        else if (zoom == 1)
                sho1();
        else if (zoom == 2)
                sho2();
}

sho0()
{
        register k,l;

        for (k=0; k<H; k++) {
                for (l=0; l<W; l++)
                        printf("%s", fbit(k,l)?"[]": "  ");
                printf("\n");
        }
        printf("\n");
}

sho1()
{
        register i,k,l;

        k = 0;
        while (k < H) {
                for(l=0;l<W;l++) {
                        i = fbit(k,l)*2 + fbit(k+1,l);
                        printf("%c",tab1[i]);
                        l++;
                }
                printf("\n");
                k += 2;
        }
        printf("\n");
}

sho2()
{
        register i,j,k,l;
        int line = curline + (base+3)/4;
        int col;

        k = base%4;
        if (k > 0) k -= 4;
        while (k < H) {
                l = 0;
                col = curcol;
                while (l<W) {
                        i = fbit(k,l)*8 + fbit(k+1,l)*4 +
                            fbit(k+2,l)*2 + fbit(k+3,l);
                        l++;
                        j = fbit(k,l)*8 + fbit(k+1,l)*4 +
                            fbit(k+2,l)*2 + fbit(k+3,l);

                        if (msgflag) {
                                if (graphtab[i][j] != ' ') {
                                        if (line > maxline) maxline = line;
                                        if (line < minline) minline = line;
                                        if (col > maxcol)   maxcol  = col;
                                }
                                msgout[line][col] = graphtab[i][j];
                        } else
                                printf("%c",graphtab[i][j]);
                        l++;
                        col++;
                }
                if (msgflag == 0)
                        printf("\n");
                k += 4;
                line--;
        }
        if (msgflag == 0)
                printf("\n");
}