fbpdf.c

   1 /*
   2  * fbpdf - a small framebuffer pdf viewer using mupdf
   3  *
   4  * Copyright (C) 2009-2014 Ali Gholami Rudi <ali at rudi dot ir>
   5  *
   6  * This program is released under the Modified BSD license.
   7  */
   8 #include <ctype.h>
   9 #include <signal.h>
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <string.h>
  13 #include <unistd.h>
  14 #include <pty.h>
  15 #include "draw.h"
  16 #include "doc.h"
  17
  18 #define MIN(a, b)       ((a) < (b) ? (a) : (b))
  19 #define MAX(a, b)       ((a) > (b) ? (a) : (b))
  20
  21 #define PAGESTEPS               8
  22 #define CTRLKEY(x)              ((x) - 96)
  23 #define ISMARK(x)               (isalpha(x) || (x) == '\'' || (x) == '`')
  24 #define MAXWIDTH                2
  25 #define MAXHEIGHT               3
  26 #define PDFCOLS                 (1 << 11)
  27 #define PDFROWS                 (1 << 12)
  28 #define MAXZOOM                 (100)
  29
  30 static struct doc *doc;
  31 static fbval_t pbuf[PDFROWS * PDFCOLS]; /* current page */
  32 static int prows, pcols;                /* the dimensions of current page */
  33
  34 static struct termios termios;
  35 static char filename[256];
  36 static int mark[128];           /* mark page number */
  37 static int mark_head[128];      /* mark head position */
  38 static int num = 1;             /* page number */
  39 static int numdiff;             /* G command page number difference */
  40 static int zoom = 15;
  41 static int zoom_def = 15;       /* default zoom */
  42 static int rotate;
  43 static int head;
  44 static int left;
  45 static int count;
  46
  47 static void draw(void)
  48 {
  49         int i;
  50         for (i = head; i < MIN(head + fb_rows(), PDFROWS); i++)
  51                 fb_set(i - head, 0, pbuf + i * PDFCOLS + left, fb_cols());
  52 }
  53
  54 static int showpage(int p, int h)
  55 {
  56         if (p < 1 || p > doc_pages(doc))
  57                 return 0;
  58         memset(pbuf, 0x00, sizeof(pbuf));
  59         prows = PDFROWS;
  60         pcols = PDFCOLS;
  61         doc_draw(doc, p, zoom, rotate, pbuf, &prows, &pcols);
  62         num = p;
  63         head = h;
  64         draw();
  65         return 0;
  66 }
  67
  68 static void zoom_page(int z)
  69 {
  70         int _zoom = zoom;
  71         zoom = MIN(MAXZOOM, MAX(1, z));
  72         showpage(num, MIN(PDFROWS - fb_rows(), head * zoom / _zoom));
  73 }
  74
  75 static void setmark(int c)
  76 {
  77         if (ISMARK(c)) {
  78                 mark[c] = num;
  79                 mark_head[c] = head / zoom;
  80         }
  81 }
  82
  83 static void jmpmark(int c, int offset)
  84 {
  85         if (c == '`')
  86                 c = '\'';
  87         if (ISMARK(c) && mark[c]) {
  88                 int dst = mark[c];
  89                 int dst_head = offset ? mark_head[c] * zoom : 0;
  90                 setmark('\'');
  91                 showpage(dst, dst_head);
  92         }
  93 }
  94
  95 static int readkey(void)
  96 {
  97         unsigned char b;
  98         if (read(0, &b, 1) <= 0)
  99                 return -1;
 100         return b;
 101 }
 102
 103 static int getcount(int def)
 104 {
 105         int result = count ? count : def;
 106         count = 0;
 107         return result;
 108 }
 109
 110 static void printinfo(void)
 111 {
 112         printf("\x1b[H");
 113         printf("FBPDF:     file:%s  page:%d(%d)  zoom:%d%% \x1b[K",
 114                 filename, num, doc_pages(doc), zoom * 10);
 115         fflush(stdout);
 116 }
 117
 118 static void term_setup(void)
 119 {
 120         struct termios newtermios;
 121         tcgetattr(0, &termios);
 122         newtermios = termios;
 123         newtermios.c_lflag &= ~ICANON;
 124         newtermios.c_lflag &= ~ECHO;
 125         tcsetattr(0, TCSAFLUSH, &newtermios);
 126 }
 127
 128 static void term_cleanup(void)
 129 {
 130         tcsetattr(0, 0, &termios);
 131 }
 132
 133 static void sigcont(int sig)
 134 {
 135         term_setup();
 136 }
 137
 138 static void reload(void)
 139 {
 140         doc_close(doc);
 141         doc = doc_open(filename);
 142         showpage(num, head);
 143 }
 144
 145 static int rightmost(int cont)
 146 {
 147         int ret = 0;
 148         int i, j;
 149         for (i = 0; i < prows; i++) {
 150                 j = PDFCOLS - 1;
 151                 while (j > ret && pbuf[i * PDFCOLS + j] == FB_VAL(0, 0, 0))
 152                         j--;
 153                 while (cont && j > ret &&
 154                                 pbuf[i * PDFCOLS + j] == FB_VAL(255, 255, 255))
 155                         j--;
 156                 if (ret < j)
 157                         ret = j;
 158         }
 159         return ret;
 160 }
 161
 162 static int leftmost(int cont)
 163 {
 164         int ret = PDFCOLS;
 165         int i, j;
 166         for (i = 0; i < prows; i++) {
 167                 j = 0;
 168                 while (j < ret && pbuf[i * PDFCOLS + j] == FB_VAL(0, 0, 0))
 169                         j++;
 170                 while (cont && j < ret &&
 171                                 pbuf[i * PDFCOLS + j] == FB_VAL(255, 255, 255))
 172                         j++;
 173                 if (ret > j)
 174                         ret = j;
 175         }
 176         return ret;
 177 }
 178
 179 static void mainloop(void)
 180 {
 181         int step = fb_rows() / PAGESTEPS;
 182         int hstep = fb_cols() / PAGESTEPS;
 183         int c;
 184         term_setup();
 185         signal(SIGCONT, sigcont);
 186         showpage(num, 0);
 187         while ((c = readkey()) != -1) {
 188                 switch (c) {
 189                 case CTRLKEY('f'):
 190                 case 'J':
 191                         showpage(num + getcount(1), 0);
 192                         break;
 193                 case CTRLKEY('b'):
 194                 case 'K':
 195                         showpage(num - getcount(1), 0);
 196                         break;
 197                 case 'G':
 198                         setmark('\'');
 199                         showpage(getcount(doc_pages(doc) - numdiff) + numdiff, 0);
 200                         break;
 201                 case 'z':
 202                         zoom_page(getcount(zoom_def));
 203                         break;
 204                 case 'Z':
 205                         zoom_def = getcount(zoom);
 206                         break;
 207                 case 'w':
 208                         zoom_page(zoom * fb_cols() / pcols);
 209                         break;
 210                 case 'W':
 211                         if (leftmost(1) < rightmost(1))
 212                                 zoom_page(zoom * (fb_cols() - hstep) /
 213                                         (rightmost(1) - leftmost(1)));
 214                         break;
 215                 case 'f':
 216                         zoom_page(zoom * fb_rows() / prows);
 217                         break;
 218                 case 'r':
 219                         rotate = getcount(0);
 220                         showpage(num, 0);
 221                         break;
 222                 case 'i':
 223                         printinfo();
 224                         break;
 225                 case 'q':
 226                         term_cleanup();
 227                         return;
 228                 case 27:
 229                         count = 0;
 230                         break;
 231                 case 'm':
 232                         setmark(readkey());
 233                         break;
 234                 case 'e':
 235                         reload();
 236                         break;
 237                 case '`':
 238                 case '\'':
 239                         jmpmark(readkey(), c == '`');
 240                         break;
 241                 case 'o':
 242                         numdiff = num - getcount(num);
 243                         break;
 244                 case 'd':
 245                         sleep(getcount(1));
 246                         break;
 247                 default:
 248                         if (isdigit(c))
 249                                 count = count * 10 + c - '0';
 250                 }
 251                 switch (c) {
 252                 case 'j':
 253                         head += step * getcount(1);
 254                         break;
 255                 case 'k':
 256                         head -= step * getcount(1);
 257                         break;
 258                 case 'l':
 259                         left += hstep * getcount(1);
 260                         break;
 261                 case 'h':
 262                         left -= hstep * getcount(1);
 263                         break;
 264                 case 'H':
 265                         head = 0;
 266                         break;
 267                 case 'L':
 268                         head = MAX(0, prows - fb_rows());
 269                         break;
 270                 case 'M':
 271                         head = (prows - fb_rows()) / 2;
 272                         break;
 273                 case ' ':
 274                 case CTRL('d'):
 275                         head += fb_rows() * getcount(1) - step;
 276                         break;
 277                 case 127:
 278                 case CTRL('u'):
 279                         head -= fb_rows() * getcount(1) - step;
 280                         break;
 281                 case '[':
 282                         left = leftmost(0);
 283                         break;
 284                 case ']':
 285                         left = rightmost(0) - fb_cols();
 286                         break;
 287                 case '{':
 288                         left = leftmost(1) - hstep / 2;
 289                         break;
 290                 case '}':
 291                         left = rightmost(1) + hstep / 2 - fb_cols();
 292                         break;
 293                 case CTRLKEY('l'):
 294                         break;
 295                 default:
 296                         /* no need to redraw */
 297                         continue;
 298                 }
 299                 head = MAX(0, MIN(PDFROWS - fb_rows(), head));
 300                 left = MAX(0, MIN(PDFCOLS - fb_cols(), left));
 301                 draw();
 302         }
 303 }
 304
 305 static char *usage =
 306         "usage: fbpdf [-r rotation] [-z zoom x10] [-p page] filename\n";
 307
 308 int main(int argc, char *argv[])
 309 {
 310         int i = 1;
 311         if (argc < 2) {
 312                 printf(usage);
 313                 return 1;
 314         }
 315         strcpy(filename, argv[argc - 1]);
 316         doc = doc_open(filename);
 317         if (!doc) {
 318                 fprintf(stderr, "cannot open <%s>\n", filename);
 319                 return 1;
 320         }
 321         for (i = 1; i < argc && argv[i][0] == '-'; i++) {
 322                 switch (argv[i][1]) {
 323                 case 'r':
 324                         rotate = atoi(argv[i][2] ? argv[i] + 2 : argv[++i]);
 325                         break;
 326                 case 'z':
 327                         zoom = atoi(argv[i][2] ? argv[i] + 2 : argv[++i]);
 328                         break;
 329                 case 'p':
 330                         num = atoi(argv[i][2] ? argv[i] + 2 : argv[++i]);
 331                         break;
 332                 }
 333         }
 334         printf("\x1b[?25l");            /* hide the cursor */
 335         printf("\x1b[2J");              /* clear the screen */
 336         printinfo();
 337         if (fb_init())
 338                 return 1;
 339         left = (PDFCOLS - fb_cols()) / 2;
 340         if (FBM_BPP(fb_mode()) != sizeof(fbval_t))
 341                 fprintf(stderr, "fbpdf: fbval_t doesn't match fb depth\n");
 342         else
 343                 mainloop();
 344         fb_free();
 345         printf("\x1b[?25h\n");          /* show the cursor */
 346         doc_close(doc);
 347         return 0;
 348 }