miscutils/fbsplash.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Copyright (C) 2008 Michele Sanges <michele.sanges@otomelara.it>,
   4  * <michele.sanges@gmail.it>
   5  *
   6  * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
   7  *
   8  * Usage:
   9  * - use kernel option 'vga=xxx' or otherwise enable framebuffer device.
  10  * - put somewhere fbsplash.cfg file and an image in .ppm format.
  11  * - run applet: $ setsid fbsplash [params] &
  12  *      -c: hide cursor
  13  *      -d /dev/fbN: framebuffer device (if not /dev/fb0)
  14  *      -s path_to_image_file (can be "-" for stdin)
  15  *      -i path_to_cfg_file
  16  *      -f path_to_fifo (can be "-" for stdin)
  17  * - if you want to run it only in presence of a kernel parameter
  18  *   (for example fbsplash=on), use:
  19  *   grep -q "fbsplash=on" </proc/cmdline && setsid fbsplash [params]
  20  * - commands for fifo:
  21  *   "NN" (ASCII decimal number) - percentage to show on progress bar.
  22  *   "exit" (or just close fifo) - well you guessed it.
  23  */
  24
  25 #include "libbb.h"
  26 #include <linux/fb.h>
  27
  28 /* If you want logging messages on /tmp/fbsplash.log... */
  29 #define DEBUG 0
  30
  31 #define BYTES_PER_PIXEL 2
  32
  33 typedef unsigned short DATA;
  34
  35 struct globals {
  36 #if DEBUG
  37         bool bdebug_messages;   // enable/disable logging
  38         FILE *logfile_fd;       // log file
  39 #endif
  40         unsigned char *addr;    // pointer to framebuffer memory
  41         unsigned nbar_width;    // progress bar width
  42         unsigned nbar_height;   // progress bar height
  43         unsigned nbar_posx;     // progress bar horizontal position
  44         unsigned nbar_posy;     // progress bar vertical position
  45         unsigned char nbar_colr;        // progress bar color red component
  46         unsigned char nbar_colg;        // progress bar color green component
  47         unsigned char nbar_colb;        // progress bar color blue component
  48         const char *image_filename;
  49         struct fb_var_screeninfo scr_var;
  50         struct fb_fix_screeninfo scr_fix;
  51 };
  52 #define G (*ptr_to_globals)
  53 #define INIT_G() do { \
  54         SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
  55 } while (0)
  56
  57
  58 #if DEBUG
  59 #define DEBUG_MESSAGE(strMessage, args...) \
  60         if (G.bdebug_messages) { \
  61                 fprintf(G.logfile_fd, "[%s][%s] - %s\n", \
  62                 __FILE__, __FUNCTION__, strMessage);    \
  63         }
  64 #else
  65 #define DEBUG_MESSAGE(...) ((void)0)
  66 #endif
  67
  68
  69 /**
  70  *      Open and initialize the framebuffer device
  71  * \param *strfb_device pointer to framebuffer device
  72  */
  73 static void fb_open(const char *strfb_device)
  74 {
  75         int fbfd = xopen(strfb_device, O_RDWR);
  76
  77         // framebuffer properties
  78         xioctl(fbfd, FBIOGET_VSCREENINFO, &G.scr_var);
  79         xioctl(fbfd, FBIOGET_FSCREENINFO, &G.scr_fix);
  80
  81         if (G.scr_var.bits_per_pixel != 16)
  82                 bb_error_msg_and_die("only 16 bpp is supported");
  83
  84         // map the device in memory
  85         G.addr = mmap(NULL,
  86                         G.scr_var.xres * G.scr_var.yres
  87                         * BYTES_PER_PIXEL /*(G.scr_var.bits_per_pixel / 8)*/ ,
  88                         PROT_WRITE, MAP_SHARED, fbfd, 0);
  89         if (G.addr == MAP_FAILED)
  90                 bb_perror_msg_and_die("can't mmap %s", strfb_device);
  91         close(fbfd);
  92 }
  93
  94
  95 /**
  96  *      Draw hollow rectangle on framebuffer
  97  */
  98 static void fb_drawrectangle(void)
  99 {
 100         int cnt;
 101         DATA thispix;
 102         DATA *ptr1, *ptr2;
 103         unsigned char nred = G.nbar_colr/2;
 104         unsigned char ngreen =  G.nbar_colg/2;
 105         unsigned char nblue = G.nbar_colb/2;
 106
 107         nred   >>= 3;  // 5-bit red
 108         ngreen >>= 2;  // 6-bit green
 109         nblue  >>= 3;  // 5-bit blue
 110         thispix = nblue + (ngreen << 5) + (nred << (5+6));
 111
 112         // horizontal lines
 113         ptr1 = (DATA*)(G.addr + (G.nbar_posy * G.scr_var.xres + G.nbar_posx) * BYTES_PER_PIXEL);
 114         ptr2 = (DATA*)(G.addr + ((G.nbar_posy + G.nbar_height - 1) * G.scr_var.xres + G.nbar_posx) * BYTES_PER_PIXEL);
 115         cnt = G.nbar_width - 1;
 116         do {
 117                 *ptr1++ = thispix;
 118                 *ptr2++ = thispix;
 119         } while (--cnt >= 0);
 120
 121         // vertical lines
 122         ptr1 = (DATA*)(G.addr + (G.nbar_posy * G.scr_var.xres + G.nbar_posx) * BYTES_PER_PIXEL);
 123         ptr2 = (DATA*)(G.addr + (G.nbar_posy * G.scr_var.xres + G.nbar_posx + G.nbar_width - 1) * BYTES_PER_PIXEL);
 124         cnt = G.nbar_posy + G.nbar_height - 1 - G.nbar_posy;
 125         do {
 126                 *ptr1 = thispix; ptr1 += G.scr_var.xres;
 127                 *ptr2 = thispix; ptr2 += G.scr_var.xres;
 128         } while (--cnt >= 0);
 129 }
 130
 131
 132 /**
 133  *      Draw filled rectangle on framebuffer
 134  * \param nx1pos,ny1pos upper left position
 135  * \param nx2pos,ny2pos down right position
 136  * \param nred,ngreen,nblue rgb color
 137  */
 138 static void fb_drawfullrectangle(int nx1pos, int ny1pos, int nx2pos, int ny2pos,
 139         unsigned char nred, unsigned char ngreen, unsigned char nblue)
 140 {
 141         int cnt1, cnt2, nypos;
 142         DATA thispix;
 143         DATA *ptr;
 144
 145         nred   >>= 3;  // 5-bit red
 146         ngreen >>= 2;  // 6-bit green
 147         nblue  >>= 3;  // 5-bit blue
 148         thispix = nblue + (ngreen << 5) + (nred << (5+6));
 149
 150         cnt1 = ny2pos - ny1pos;
 151         nypos = ny1pos;
 152         do {
 153                 ptr = (DATA*)(G.addr + (nypos * G.scr_var.xres + nx1pos) * BYTES_PER_PIXEL);
 154                 cnt2 = nx2pos - nx1pos;
 155                 do {
 156                         *ptr++ = thispix;
 157                 } while (--cnt2 >= 0);
 158
 159                 nypos++;
 160         } while (--cnt1 >= 0);
 161 }
 162
 163
 164 /**
 165  *      Draw a progress bar on framebuffer
 166  * \param percent percentage of loading
 167  */
 168 static void fb_drawprogressbar(unsigned percent)
 169 {
 170         int i, left_x, top_y, width, height;
 171
 172         // outer box
 173         left_x = G.nbar_posx;
 174         top_y = G.nbar_posy;
 175         width = G.nbar_width - 1;
 176         height = G.nbar_height - 1;
 177         if ((height | width) < 0)
 178                 return;
 179         // NB: "width" of 1 actually makes rect with width of 2!
 180         fb_drawrectangle();
 181
 182         // inner "empty" rectangle
 183         left_x++;
 184         top_y++;
 185         width -= 2;
 186         height -= 2;
 187         if ((height | width) < 0)
 188                 return;
 189         fb_drawfullrectangle(
 190                         left_x, top_y,
 191                                         left_x + width, top_y + height,
 192                         G.nbar_colr, G.nbar_colg, G.nbar_colb);
 193
 194         if (percent > 0) {
 195                 // actual progress bar
 196                 width = width * percent / 100;
 197                 i = height;
 198                 if (height == 0)
 199                         height++; // divide by 0 is bad
 200                 while (i >= 0) {
 201                         // draw one-line thick "rectangle"
 202                         // top line will have gray lvl 200, bottom one 100
 203                         unsigned gray_level = 100 + i*100/height;
 204                         fb_drawfullrectangle(
 205                                         left_x, top_y, left_x + width, top_y,
 206                                         gray_level, gray_level, gray_level);
 207                         top_y++;
 208                         i--;
 209                 }
 210         }
 211 }
 212
 213
 214 /**
 215  *      Draw image from PPM file
 216  */
 217 static void fb_drawimage(void)
 218 {
 219         char head[256];
 220         char s[80];
 221         FILE *theme_file;
 222         unsigned char *pixline;
 223         unsigned i, j, width, height, line_size;
 224
 225         memset(head, 0, sizeof(head));
 226         theme_file = xfopen_stdin(G.image_filename);
 227
 228         // parse ppm header
 229         while (1) {
 230                 if (fgets(s, sizeof(s), theme_file) == NULL)
 231                         bb_error_msg_and_die("bad PPM file '%s'", G.image_filename);
 232
 233                 if (s[0] == '#')
 234                         continue;
 235
 236                 if (strlen(head) + strlen(s) >= sizeof(head))
 237                         bb_error_msg_and_die("bad PPM file '%s'", G.image_filename);
 238
 239                 strcat(head, s);
 240                 if (head[0] != 'P' || head[1] != '6')
 241                         bb_error_msg_and_die("bad PPM file '%s'", G.image_filename);
 242
 243                 // width, height, max_color_val
 244                 if (sscanf(head, "P6 %u %u %u", &width, &height, &i) == 3)
 245                         break;
 246 // TODO: i must be <= 255!
 247         }
 248
 249         line_size = width*3;
 250         if (width > G.scr_var.xres)
 251                 width = G.scr_var.xres;
 252         if (height > G.scr_var.yres)
 253                 height = G.scr_var.yres;
 254
 255         pixline = xmalloc(line_size);
 256         for (j = 0; j < height; j++) {
 257                 unsigned char *pixel = pixline;
 258                 DATA *src = (DATA *)(G.addr + j * G.scr_fix.line_length);
 259
 260                 if (fread(pixline, 1, line_size, theme_file) != line_size)
 261                         bb_error_msg_and_die("bad PPM file '%s'", G.image_filename);
 262                 for (i = 0; i < width; i++) {
 263                         unsigned thispix;
 264                         thispix = (((unsigned)pixel[0] << 8) & 0xf800)
 265                                 | (((unsigned)pixel[1] << 3) & 0x07e0)
 266                                 | (((unsigned)pixel[2] >> 3));
 267                         *src++ = thispix;
 268                         pixel += 3;
 269                 }
 270         }
 271         free(pixline);
 272         fclose(theme_file);
 273 }
 274
 275
 276 /**
 277  *      Parse configuration file
 278  * \param *cfg_filename name of the configuration file
 279  */
 280 static void init(const char *cfg_filename)
 281 {
 282         static const char const param_names[] ALIGN1 =
 283                 "BAR_LEFT\0" "BAR_TOP\0"
 284                 "BAR_WIDTH\0" "BAR_HEIGHT\0"
 285                 "BAR_R\0" "BAR_G\0" "BAR_B\0"
 286 #if DEBUG
 287                 "DEBUG\0"
 288 #endif
 289                 ;
 290
 291         FILE *inifile;
 292         char *buf;
 293
 294         inifile = xfopen_stdin(cfg_filename);
 295
 296         while ((buf = xmalloc_fgetline(inifile)) != NULL) {
 297                 char *value_str;
 298                 int val;
 299
 300                 if (*buf == '#') {  // it's a comment
 301                         free(buf);
 302                         continue;
 303                 }
 304
 305                 value_str = strchr(buf, '=');
 306                 if (!value_str)
 307                         goto err;
 308                 *value_str++ = '\0';
 309                 val = xatoi_u(value_str);
 310
 311                 switch (index_in_strings(param_names, buf)) {
 312                 case 0:
 313                         // progress bar horizontal position
 314                         G.nbar_posx = val;
 315                         break;
 316                 case 1:
 317                         // progress bar vertical position
 318                         G.nbar_posy = val;
 319                         break;
 320                 case 2:
 321                         // progress bar width
 322                         G.nbar_width = val;
 323                         break;
 324                 case 3:
 325                         // progress bar height
 326                         G.nbar_height = val;
 327                         break;
 328                 case 4:
 329                         // progress bar color - red component
 330                         G.nbar_colr = val;
 331                         break;
 332                 case 5:
 333                         // progress bar color - green component
 334                         G.nbar_colg = val;
 335                         break;
 336                 case 6:
 337                         // progress bar color - blue component
 338                         G.nbar_colb = val;
 339                         break;
 340 #if DEBUG
 341                 case 7:
 342                         G.bdebug_messages = val;
 343                         if (G.bdebug_messages)
 344                                 G.logfile_fd = xfopen("/tmp/fbsplash.log", "w");
 345                         break;
 346 #endif
 347  err:
 348                 default:
 349                         bb_error_msg_and_die("syntax error: '%s'", buf);
 350                 }
 351                 free(buf);
 352         }
 353         fclose(inifile);
 354 }
 355
 356
 357 int fbsplash_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 358 int fbsplash_main(int argc UNUSED_PARAM, char **argv)
 359 {
 360         const char *fb_device, *cfg_filename, *fifo_filename;
 361         FILE *fp = fp; // for compiler
 362         char *num_buf;
 363         unsigned num;
 364         bool bCursorOff;
 365
 366         INIT_G();
 367
 368         // parse command line options
 369         fb_device = "/dev/fb0";
 370         cfg_filename = NULL;
 371         fifo_filename = NULL;
 372         bCursorOff = 1 & getopt32(argv, "cs:d:i:f:",
 373                         &G.image_filename, &fb_device, &cfg_filename, &fifo_filename);
 374
 375         // parse configuration file
 376         if (cfg_filename)
 377                 init(cfg_filename);
 378
 379         // We must have -s IMG
 380         if (!G.image_filename)
 381                 bb_show_usage();
 382
 383         fb_open(fb_device);
 384
 385         if (fifo_filename && bCursorOff) {
 386                 // hide cursor (BEFORE any fb ops)
 387                 full_write(STDOUT_FILENO, "\x1b" "[?25l", 6);
 388         }
 389
 390         fb_drawimage();
 391
 392         if (!fifo_filename)
 393                 return EXIT_SUCCESS;
 394
 395         fp = xfopen_stdin(fifo_filename);
 396         if (fp != stdin) {
 397                 // For named pipes, we want to support this:
 398                 //  mkfifo cmd_pipe
 399                 //  fbsplash -f cmd_pipe .... &
 400                 //  ...
 401                 //  echo 33 >cmd_pipe
 402                 //  ...
 403                 //  echo 66 >cmd_pipe
 404                 // This means that we don't want fbsplash to get EOF
 405                 // when last writer closes input end.
 406                 // The simplest way is to open fifo for writing too
 407                 // and become an additional writer :)
 408                 open(fifo_filename, O_WRONLY); // errors are ignored
 409         }
 410
 411         fb_drawprogressbar(0);
 412         // Block on read, waiting for some input.
 413         // Use of <stdio.h> style I/O allows to correctly
 414         // handle a case when we have many buffered lines
 415         // already in the pipe
 416         while ((num_buf = xmalloc_fgetline(fp)) != NULL) {
 417                 if (strncmp(num_buf, "exit", 4) == 0) {
 418                         DEBUG_MESSAGE("exit");
 419                         break;
 420                 }
 421                 num = atoi(num_buf);
 422                 if (isdigit(num_buf[0]) && (num <= 100)) {
 423 #if DEBUG
 424                         char strVal[10];
 425                         sprintf(strVal, "%d", num);
 426                         DEBUG_MESSAGE(strVal);
 427 #endif
 428                         fb_drawprogressbar(num);
 429                 }
 430                 free(num_buf);
 431         }
 432
 433         if (bCursorOff) // restore cursor
 434                 full_write(STDOUT_FILENO, "\x1b" "[?25h", 6);
 435
 436         return EXIT_SUCCESS;
 437 }