ref: 2149600d129944f60cbc858bc669193af0523409
dir: /sys/src/cmd/tcs/font/bbits.c/
#include <u.h> #include <libc.h> #include <libg.h> #include <bio.h> #include "hdr.h" enum { Charsperfont = 157, Void1b = (0xC6-0xA2)*Charsperfont+0x3f, Void1e = (0xC9-0xA2)*Charsperfont - 1 , }; Bitmap * breadbits(char *file, int n, long *chars, int size, uchar *bits, int **doneptr) { Bitmap *bm; Biobuf *bf; int i, j, byt; int nch; long c; uchar *b, *nbits; int *done; static uchar missing[32] = {0x00, 0x00, 0x00, 0x00, 0x10, 0x00, 0x08, 0x00, 0x04, 0x00, 0x02, 0x00, 0x01, 0x00, 0x00, 0x80, 0x00, 0x40, 0x00, 0x20, 0x00, 0x10, 0x00, 0x08, 0x00, 0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }; uchar buf[32]; bf = Bopen(file, OREAD); if(bf == 0){ fprint(2, "%s: %s: %r\n", argv0, file); exits("bitfile open error"); } done = (int *)malloc(n*sizeof(done[0])); if(done == 0){ fprint(2, "%s: malloc error (%d bytes)\n", argv0, n); exits("malloc error"); } *doneptr = done; byt = size/8; nch = 0; for(i = 0; i < n; i++){ done[i] = 1; nch++; c = chars[i]; if((c >= Void1b) && (c <= Void1e)){ done[i] = 0; nch--; continue; } /* magic via presotto for calculating the seek */ j = c; if(c >= 2*Charsperfont) j += 294; /* baffling hole between A3 and A4 */ if(c > Void1e) j -= 3*Charsperfont - 0x3F; j *= byt*size; /* bytes per char */ j += 256; /* 256 front matter */ Bseek(bf, j, 0); Bread(bf, buf, sizeof(missing)); if(memcmp(buf, missing, sizeof(missing)) == 0){ done[i] = 0; nch--; continue; } Bseek(bf, j, 0); b = bits + i*byt; for(j = 0; j < size; j++){ /* rows */ Bread(bf, b, byt); b += n*byt; } } nbits = (uchar *)malloc(nch*byt*size); if(nbits == 0){ fprint(2, "%s: malloc error (%d bytes)\n", argv0, nch*byt); exits("malloc error"); } c = 0; for(i = 0; i < n; i++) if(done[i]){ for(j = 0; j < size; j++) memmove(nbits+c*byt+j*nch*byt, bits+i*byt+j*n*byt, byt); c++; } bm = balloc((Rectangle){(Point){0, 0}, (Point){nch*size, size}}, 0); if(bm == 0){ fprint(2, "%s: balloc failure\n", argv0); exits("balloc failure"); } wrbitmap(bm, 0, size, nbits); return(bm); }