fbpdf.c

   1 /*
   2  * FBPDF LINUX FRAMEBUFFER PDF VIEWER
   3  *
   4  * Copyright (C) 2009-2016 Ali Gholami Rudi <ali at rudi dot ir>
   5  *
   6  * Permission to use, copy, modify, and/or distribute this software for any
   7  * purpose with or without fee is hereby granted, provided that the above
   8  * copyright notice and this permission notice appear in all copies.
   9  *
  10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  17  */
  18 #include <ctype.h>
  19 #include <signal.h>
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23 #include <termios.h>
  24 #include <unistd.h>
  25 #include "draw.h"
  26 #include "doc.h"
  27
  28 #define MIN(a, b)       ((a) < (b) ? (a) : (b))
  29 #define MAX(a, b)       ((a) > (b) ? (a) : (b))
  30
  31 #define PAGESTEPS       8
  32 #define MAXZOOM         100
  33 #define MARGIN          1
  34 #define CTRLKEY(x)      ((x) - 96)
  35 #define ISMARK(x)       (isalpha(x) || (x) == '\'' || (x) == '`')
  36
  37 static struct doc *doc;
  38 static fbval_t *pbuf;           /* current page */
  39 static int srows, scols;        /* screen dimentions */
  40 static int prows, pcols;        /* current page dimensions */
  41 static int prow, pcol;          /* page position */
  42 static int srow, scol;          /* screen position */
  43
  44 static struct termios termios;
  45 static char filename[256];
  46 static int mark[128];           /* mark page number */
  47 static int mark_row[128];       /* mark head position */
  48 static int num = 1;             /* page number */
  49 static int numdiff;             /* G command page number difference */
  50 static int zoom = 15;
  51 static int zoom_def = 15;       /* default zoom */
  52 static int rotate;
  53 static int count;
  54 static int invert;              /* invert colors? */
  55
  56 static void draw(void)
  57 {
  58         int i;
  59         fbval_t *rbuf = malloc(scols * sizeof(rbuf[0]));
  60         for (i = srow; i < srow + srows; i++) {
  61                 int cbeg = MAX(scol, pcol);
  62                 int cend = MIN(scol + scols, pcol + pcols);
  63                 memset(rbuf, 0, scols * sizeof(rbuf[0]));
  64                 if (i >= prow && i < prow + prows && cbeg < cend) {
  65                         memcpy(rbuf + cbeg - scol,
  66                                 pbuf + (i - prow) * pcols + cbeg - pcol,
  67                                 (cend - cbeg) * sizeof(rbuf[0]));
  68                 }
  69                 fb_set(i - srow, 0, rbuf, scols);
  70         }
  71         free(rbuf);
  72 }
  73
  74 static int loadpage(int p)
  75 {
  76         int i;
  77         if (p < 1 || p > doc_pages(doc))
  78                 return 1;
  79         prows = 0;
  80         free(pbuf);
  81         pbuf = doc_draw(doc, p, zoom, rotate, &prows, &pcols);
  82         if (invert) {
  83                 for (i = 0; i < prows * pcols; i++)
  84                         pbuf[i] = pbuf[i] ^ 0xffffffff;
  85         }
  86         prow = -prows / 2;
  87         pcol = -pcols / 2;
  88         num = p;
  89         return 0;
  90 }
  91
  92 static void zoom_page(int z)
  93 {
  94         int _zoom = zoom;
  95         zoom = MIN(MAXZOOM, MAX(1, z));
  96         if (!loadpage(num))
  97                 srow = srow * zoom / _zoom;
  98 }
  99
 100 static void setmark(int c)
 101 {
 102         if (ISMARK(c)) {
 103                 mark[c] = num;
 104                 mark_row[c] = srow / zoom;
 105         }
 106 }
 107
 108 static void jmpmark(int c, int offset)
 109 {
 110         if (c == '`')
 111                 c = '\'';
 112         if (ISMARK(c) && mark[c]) {
 113                 int dst = mark[c];
 114                 int dst_row = offset ? mark_row[c] * zoom : 0;
 115                 setmark('\'');
 116                 if (!loadpage(dst))
 117                         srow = offset ? dst_row : prow;
 118         }
 119 }
 120
 121 static int readkey(void)
 122 {
 123         unsigned char b;
 124         if (read(0, &b, 1) <= 0)
 125                 return -1;
 126         return b;
 127 }
 128
 129 static int getcount(int def)
 130 {
 131         int result = count ? count : def;
 132         count = 0;
 133         return result;
 134 }
 135
 136 static void printinfo(void)
 137 {
 138         printf("\x1b[H");
 139         printf("FBPDF:     file:%s  page:%d(%d)  zoom:%d%% \x1b[K\r",
 140                 filename, num, doc_pages(doc), zoom * 10);
 141         fflush(stdout);
 142 }
 143
 144 static void term_setup(void)
 145 {
 146         struct termios newtermios;
 147         tcgetattr(0, &termios);
 148         newtermios = termios;
 149         newtermios.c_lflag &= ~ICANON;
 150         newtermios.c_lflag &= ~ECHO;
 151         tcsetattr(0, TCSAFLUSH, &newtermios);
 152         printf("\x1b[?25l");            /* hide the cursor */
 153         printf("\x1b[2J");              /* clear the screen */
 154         fflush(stdout);
 155 }
 156
 157 static void term_cleanup(void)
 158 {
 159         tcsetattr(0, 0, &termios);
 160         printf("\x1b[?25h\n");          /* show the cursor */
 161 }
 162
 163 static void sigcont(int sig)
 164 {
 165         term_setup();
 166 }
 167
 168 static int reload(void)
 169 {
 170         doc_close(doc);
 171         doc = doc_open(filename);
 172         if (!doc || !doc_pages(doc)) {
 173                 fprintf(stderr, "\nfbpdf: cannot open <%s>\n", filename);
 174                 return 1;
 175         }
 176         if (!loadpage(num))
 177                 draw();
 178         return 0;
 179 }
 180
 181 static int rmargin(void)
 182 {
 183         int ret = 0;
 184         int i, j;
 185         for (i = 0; i < prows; i++) {
 186                 j = pcols - 1;
 187                 while (j > ret && pbuf[i * pcols + j] == FB_VAL(255, 255, 255))
 188                         j--;
 189                 if (ret < j)
 190                         ret = j;
 191         }
 192         return ret;
 193 }
 194
 195 static int lmargin(void)
 196 {
 197         int ret = pcols;
 198         int i, j;
 199         for (i = 0; i < prows; i++) {
 200                 j = 0;
 201                 while (j < ret && pbuf[i * pcols + j] == FB_VAL(255, 255, 255))
 202                         j++;
 203                 if (ret > j)
 204                         ret = j;
 205         }
 206         return ret;
 207 }
 208
 209 static void mainloop(void)
 210 {
 211         int step = srows / PAGESTEPS;
 212         int hstep = scols / PAGESTEPS;
 213         int c;
 214         term_setup();
 215         signal(SIGCONT, sigcont);
 216         loadpage(num);
 217         srow = prow;
 218         scol = -scols / 2;
 219         draw();
 220         while ((c = readkey()) != -1) {
 221                 if (c == 'q')
 222                         break;
 223                 if (c == 'e' && reload())
 224                         break;
 225                 switch (c) {    /* commands that do not require redrawing */
 226                 case 'o':
 227                         numdiff = num - getcount(num);
 228                         break;
 229                 case 'Z':
 230                         zoom_def = getcount(zoom);
 231                         break;
 232                 case 'i':
 233                         printinfo();
 234                         break;
 235                 case 27:
 236                         count = 0;
 237                         break;
 238                 case 'm':
 239                         setmark(readkey());
 240                         break;
 241                 case 'd':
 242                         sleep(getcount(1));
 243                         break;
 244                 default:
 245                         if (isdigit(c))
 246                                 count = count * 10 + c - '0';
 247                 }
 248                 switch (c) {    /* commands that require redrawing */
 249                 case CTRLKEY('f'):
 250                 case 'J':
 251                         if (!loadpage(num + getcount(1)))
 252                                 srow = prow;
 253                         break;
 254                 case CTRLKEY('b'):
 255                 case 'K':
 256                         if (!loadpage(num - getcount(1)))
 257                                 srow = prow;
 258                         break;
 259                 case 'G':
 260                         setmark('\'');
 261                         if (!loadpage(getcount(doc_pages(doc) - numdiff) + numdiff))
 262                                 srow = prow;
 263                         break;
 264                 case 'O':
 265                         numdiff = num - getcount(num);
 266                         setmark('\'');
 267                         if (!loadpage(num + numdiff))
 268                                 srow = prow;
 269                         break;
 270                 case 'z':
 271                         zoom_page(getcount(zoom_def));
 272                         break;
 273                 case 'w':
 274                         zoom_page(pcols ? zoom * scols / pcols : zoom);
 275                         break;
 276                 case 'W':
 277                         if (lmargin() < rmargin())
 278                                 zoom_page(zoom * (scols - hstep) /
 279                                         (rmargin() - lmargin()));
 280                         break;
 281                 case 'f':
 282                         zoom_page(prows ? zoom * srows / prows : zoom);
 283                         break;
 284                 case 'r':
 285                         rotate = getcount(0);
 286                         if (!loadpage(num))
 287                                 srow = prow;
 288                         break;
 289                 case '`':
 290                 case '\'':
 291                         jmpmark(readkey(), c == '`');
 292                         break;
 293                 case 'j':
 294                         srow += step * getcount(1);
 295                         break;
 296                 case 'k':
 297                         srow -= step * getcount(1);
 298                         break;
 299                 case 'l':
 300                         scol += hstep * getcount(1);
 301                         break;
 302                 case 'h':
 303                         scol -= hstep * getcount(1);
 304                         break;
 305                 case 'H':
 306                         srow = prow;
 307                         break;
 308                 case 'L':
 309                         srow = prow + prows - srows;
 310                         break;
 311                 case 'M':
 312                         srow = prow + prows / 2 - srows / 2;
 313                         break;
 314                 case 'C':
 315                         scol = -scols / 2;
 316                         break;
 317                 case ' ':
 318                 case CTRLKEY('d'):
 319                         srow += srows * getcount(1) - step;
 320                         break;
 321                 case 127:
 322                 case CTRLKEY('u'):
 323                         srow -= srows * getcount(1) - step;
 324                         break;
 325                 case '[':
 326                         scol = pcol;
 327                         break;
 328                 case ']':
 329                         scol = pcol + pcols - scols;
 330                         break;
 331                 case '{':
 332                         scol = pcol + lmargin() - hstep / 2;
 333                         break;
 334                 case '}':
 335                         scol = pcol + rmargin() + hstep / 2 - scols;
 336                         break;
 337                 case CTRLKEY('l'):
 338                         break;
 339                 case 'I':
 340                         invert = !invert;
 341                         loadpage(num);
 342                         break;
 343                 default:        /* no need to redraw */
 344                         continue;
 345                 }
 346                 srow = MAX(prow - srows + MARGIN, MIN(prow + prows - MARGIN, srow));
 347                 scol = MAX(pcol - scols + MARGIN, MIN(pcol + pcols - MARGIN, scol));
 348                 draw();
 349         }
 350         term_cleanup();
 351 }
 352
 353 static char *usage =
 354         "usage: fbpdf [-r rotation] [-z zoom x10] [-p page] filename\n";
 355
 356 int main(int argc, char *argv[])
 357 {
 358         int i = 1;
 359         if (argc < 2) {
 360                 printf(usage);
 361                 return 1;
 362         }
 363         strcpy(filename, argv[argc - 1]);
 364         doc = doc_open(filename);
 365         if (!doc || !doc_pages(doc)) {
 366                 fprintf(stderr, "fbpdf: cannot open <%s>\n", filename);
 367                 return 1;
 368         }
 369         for (i = 1; i < argc && argv[i][0] == '-'; i++) {
 370                 switch (argv[i][1]) {
 371                 case 'r':
 372                         rotate = atoi(argv[i][2] ? argv[i] + 2 : argv[++i]);
 373                         break;
 374                 case 'z':
 375                         zoom = atoi(argv[i][2] ? argv[i] + 2 : argv[++i]);
 376                         break;
 377                 case 'p':
 378                         num = atoi(argv[i][2] ? argv[i] + 2 : argv[++i]);
 379                         break;
 380                 }
 381         }
 382         printinfo();
 383         if (fb_init())
 384                 return 1;
 385         srows = fb_rows();
 386         scols = fb_cols();
 387         if (FBM_BPP(fb_mode()) != sizeof(fbval_t))
 388                 fprintf(stderr, "fbpdf: fbval_t doesn't match fb depth\n");
 389         else
 390                 mainloop();
 391         fb_free();
 392         free(pbuf);
 393         if (doc)
 394                 doc_close(doc);
 395         return 0;
 396 }