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() \
  54         do { \
  55                 SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
  56         } while (0)
  57
  58
  59 #if DEBUG
  60 #define DEBUG_MESSAGE(strMessage, args...) \
  61         if (G.bdebug_messages) { \
  62                 fprintf(G.logfile_fd, "[%s][%s] - %s\n", \
  63                 __FILE__, __FUNCTION__, strMessage);    \
  64         }
  65 #else
  66 #define DEBUG_MESSAGE(...) ((void)0)
  67 #endif
  68
  69
  70 /**
  71  *      Open and initialize the framebuffer device
  72  * \param *strfb_device pointer to framebuffer device
  73  */
  74 static void fb_open(const char *strfb_device)
  75 {
  76         int fbfd = xopen(strfb_device, O_RDWR);
  77
  78         // framebuffer properties
  79         xioctl(fbfd, FBIOGET_VSCREENINFO, &G.scr_var);
  80         xioctl(fbfd, FBIOGET_FSCREENINFO, &G.scr_fix);
  81
  82         if (G.scr_var.bits_per_pixel != 16)
  83                 bb_error_msg_and_die("only 16 bpp is supported");
  84
  85         // map the device in memory
  86         G.addr = mmap(NULL,
  87                         G.scr_var.xres * G.scr_var.yres
  88                         * BYTES_PER_PIXEL /*(G.scr_var.bits_per_pixel / 8)*/ ,
  89                         PROT_WRITE, MAP_SHARED, fbfd, 0);
  90         if (G.addr == MAP_FAILED)
  91                 bb_perror_msg_and_die("can't mmap %s", strfb_device);
  92         close(fbfd);
  93 }
  94
  95
  96 /**
  97  *      Draw hollow rectangle on framebuffer
  98  */
  99 static void fb_drawrectangle(void)
 100 {
 101         int cnt;
 102         DATA thispix;
 103         DATA *ptr1, *ptr2;
 104         unsigned char nred = G.nbar_colr/2;
 105         unsigned char ngreen =  G.nbar_colg/2;
 106         unsigned char nblue = G.nbar_colb/2;
 107
 108         nred   >>= 3;  // 5-bit red
 109         ngreen >>= 2;  // 6-bit green
 110         nblue  >>= 3;  // 5-bit blue
 111         thispix = nblue + (ngreen << 5) + (nred << (5+6));
 112
 113         // horizontal lines
 114         ptr1 = (DATA*)(G.addr + (G.nbar_posy * G.scr_var.xres + G.nbar_posx) * BYTES_PER_PIXEL);
 115         ptr2 = (DATA*)(G.addr + ((G.nbar_posy + G.nbar_height - 1) * G.scr_var.xres + G.nbar_posx) * BYTES_PER_PIXEL);
 116         cnt = G.nbar_width - 1;
 117         do {
 118                 *ptr1++ = thispix;
 119                 *ptr2++ = thispix;
 120         } while (--cnt >= 0);
 121
 122         // vertical lines
 123         ptr1 = (DATA*)(G.addr + (G.nbar_posy * G.scr_var.xres + G.nbar_posx) * BYTES_PER_PIXEL);
 124         ptr2 = (DATA*)(G.addr + (G.nbar_posy * G.scr_var.xres + G.nbar_posx + G.nbar_width - 1) * BYTES_PER_PIXEL);
 125         cnt = G.nbar_posy + G.nbar_height - 1 - G.nbar_posy;
 126         do {
 127                 *ptr1 = thispix; ptr1 += G.scr_var.xres;
 128                 *ptr2 = thispix; ptr2 += G.scr_var.xres;
 129         } while (--cnt >= 0);
 130 }
 131
 132
 133 /**
 134  *      Draw filled rectangle on framebuffer
 135  * \param nx1pos,ny1pos upper left position
 136  * \param nx2pos,ny2pos down right position
 137  * \param nred,ngreen,nblue rgb color
 138  */
 139 static void fb_drawfullrectangle(int nx1pos, int ny1pos, int nx2pos, int ny2pos,
 140         unsigned char nred, unsigned char ngreen, unsigned char nblue)
 141 {
 142         int cnt1, cnt2, nypos;
 143         DATA thispix;
 144         DATA *ptr;
 145
 146         nred   >>= 3;  // 5-bit red
 147         ngreen >>= 2;  // 6-bit green
 148         nblue  >>= 3;  // 5-bit blue
 149         thispix = nblue + (ngreen << 5) + (nred << (5+6));
 150
 151         cnt1 = ny2pos - ny1pos;
 152         nypos = ny1pos;
 153         do {
 154                 ptr = (DATA*)(G.addr + (nypos * G.scr_var.xres + nx1pos) * BYTES_PER_PIXEL);
 155                 cnt2 = nx2pos - nx1pos;
 156                 do {
 157                         *ptr++ = thispix;
 158                 } while (--cnt2 >= 0);
 159
 160                 nypos++;
 161         } while (--cnt1 >= 0);
 162 }
 163
 164
 165 /**
 166  *      Draw a progress bar on framebuffer
 167  * \param percent percentage of loading
 168  */
 169 static void fb_drawprogressbar(unsigned percent)
 170 {
 171         int i, left_x, top_y, width, height;
 172
 173         // outer box
 174         left_x = G.nbar_posx;
 175         top_y = G.nbar_posy;
 176         width = G.nbar_width - 1;
 177         height = G.nbar_height - 1;
 178         if ((height | width) < 0)
 179                 return;
 180         // NB: "width" of 1 actually makes rect with width of 2!
 181         fb_drawrectangle();
 182
 183         // inner "empty" rectangle
 184         left_x++;
 185         top_y++;
 186         width -= 2;
 187         height -= 2;
 188         if ((height | width) < 0)
 189                 return;
 190         fb_drawfullrectangle(
 191                         left_x, top_y,
 192                                         left_x + width, top_y + height,
 193                         G.nbar_colr, G.nbar_colg, G.nbar_colb);
 194
 195         if (percent > 0) {
 196                 // actual progress bar
 197                 width = width * percent / 100;
 198                 i = height;
 199                 if (height == 0)
 200                         height++; // divide by 0 is bad
 201                 while (i >= 0) {
 202                         // draw one-line thick "rectangle"
 203                         // top line will have gray lvl 200, bottom one 100
 204                         unsigned gray_level = 100 + i*100/height;
 205                         fb_drawfullrectangle(
 206                                         left_x, top_y, left_x + width, top_y,
 207                                         gray_level, gray_level, gray_level);
 208                         top_y++;
 209                         i--;
 210                 }
 211         }
 212 }
 213
 214
 215 /**
 216  *      Draw image from PPM file
 217  */
 218 static void fb_drawimage(void)
 219 {
 220         char head[256];
 221         char s[80];
 222         FILE *theme_file;
 223         unsigned char *pixline;
 224         unsigned i, j, width, height, line_size;
 225
 226         memset(head, 0, sizeof(head));
 227         theme_file = xfopen_stdin(G.image_filename);
 228
 229         // parse ppm header
 230         while (1) {
 231                 if (fgets(s, sizeof(s), theme_file) == NULL)
 232                         bb_error_msg_and_die("bad PPM file '%s'", G.image_filename);
 233
 234                 if (s[0] == '#')
 235                         continue;
 236
 237                 if (strlen(head) + strlen(s) >= sizeof(head))
 238                         bb_error_msg_and_die("bad PPM file '%s'", G.image_filename);
 239
 240                 strcat(head, s);
 241                 if (head[0] != 'P' || head[1] != '6')
 242                         bb_error_msg_and_die("bad PPM file '%s'", G.image_filename);
 243
 244                 // width, height, max_color_val
 245                 if (sscanf(head, "P6 %u %u %u", &width, &height, &i) == 3)
 246                         break;
 247 // TODO: i must be <= 255!
 248         }
 249
 250         line_size = width*3;
 251         if (width > G.scr_var.xres)
 252                 width = G.scr_var.xres;
 253         if (height > G.scr_var.yres)
 254                 height = G.scr_var.yres;
 255
 256         pixline = xmalloc(line_size);
 257         for (j = 0; j < height; j++) {
 258                 unsigned char *pixel = pixline;
 259                 DATA *src = (DATA *)(G.addr + j * G.scr_fix.line_length);
 260
 261                 if (fread(pixline, 1, line_size, theme_file) != line_size)
 262                         bb_error_msg_and_die("bad PPM file '%s'", G.image_filename);
 263                 for (i = 0; i < width; i++) {
 264                         unsigned thispix;
 265                         thispix = (((unsigned)pixel[0] << 8) & 0xf800)
 266                                 | (((unsigned)pixel[1] << 3) & 0x07e0)
 267                                 | (((unsigned)pixel[2] >> 3));
 268                         *src++ = thispix;
 269                         pixel += 3;
 270                 }
 271         }
 272         free(pixline);
 273         fclose(theme_file);
 274 }
 275
 276
 277 /**
 278  *      Parse configuration file
 279  * \param *cfg_filename name of the configuration file
 280  */
 281 static void init(const char *cfg_filename)
 282 {
 283         static const char const param_names[] ALIGN1 =
 284                 "BAR_LEFT\0" "BAR_TOP\0"
 285                 "BAR_WIDTH\0" "BAR_HEIGHT\0"
 286                 "BAR_R\0" "BAR_G\0" "BAR_B\0"
 287 #if DEBUG
 288                 "DEBUG\0"
 289 #endif
 290                 ;
 291
 292         FILE *inifile;
 293         char *buf;
 294
 295         inifile = xfopen_stdin(cfg_filename);
 296
 297         while ((buf = xmalloc_fgetline(inifile)) != NULL) {
 298                 char *value_str;
 299                 int val;
 300
 301                 if (*buf == '#') {  // it's a comment
 302                         free(buf);
 303                         continue;
 304                 }
 305
 306                 value_str = strchr(buf, '=');
 307                 if (!value_str)
 308                         goto err;
 309                 *value_str++ = '\0';
 310                 val = xatoi_u(value_str);
 311
 312                 switch (index_in_strings(param_names, buf)) {
 313                 case 0:
 314                         // progress bar horizontal position
 315                         G.nbar_posx = val;
 316                         break;
 317                 case 1:
 318                         // progress bar vertical position
 319                         G.nbar_posy = val;
 320                         break;
 321                 case 2:
 322                         // progress bar width
 323                         G.nbar_width = val;
 324                         break;
 325                 case 3:
 326                         // progress bar height
 327                         G.nbar_height = val;
 328                         break;
 329                 case 4:
 330                         // progress bar color - red component
 331                         G.nbar_colr = val;
 332                         break;
 333                 case 5:
 334                         // progress bar color - green component
 335                         G.nbar_colg = val;
 336                         break;
 337                 case 6:
 338                         // progress bar color - blue component
 339                         G.nbar_colb = val;
 340                         break;
 341 #if DEBUG
 342                 case 7:
 343                         G.bdebug_messages = val;
 344                         if (G.bdebug_messages)
 345                                 G.logfile_fd = xfopen("/tmp/fbsplash.log", "w");
 346                         break;
 347 #endif
 348  err:
 349                 default:
 350                         bb_error_msg_and_die("syntax error: '%s'", buf);
 351                 }
 352                 free(buf);
 353         }
 354         fclose(inifile);
 355 }
 356
 357
 358 int fbsplash_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 359 int fbsplash_main(int argc ATTRIBUTE_UNUSED, char **argv)
 360 {
 361         const char *fb_device, *cfg_filename, *fifo_filename;
 362         FILE *fp = fp; // for compiler
 363         char *num_buf;
 364         unsigned num;
 365         bool bCursorOff;
 366
 367         INIT_G();
 368
 369         // parse command line options
 370         fb_device = "/dev/fb0";
 371         cfg_filename = NULL;
 372         fifo_filename = NULL;
 373         bCursorOff = 1 & getopt32(argv, "cs:d:i:f:",
 374                         &G.image_filename, &fb_device, &cfg_filename, &fifo_filename);
 375
 376         // parse configuration file
 377         if (cfg_filename)
 378                 init(cfg_filename);
 379
 380         // We must have -s IMG
 381         if (!G.image_filename)
 382                 bb_show_usage();
 383
 384         fb_open(fb_device);
 385
 386         if (fifo_filename && bCursorOff) {
 387                 // hide cursor (BEFORE any fb ops)
 388                 full_write(STDOUT_FILENO, "\x1b" "[?25l", 6);
 389         }
 390
 391         fb_drawimage();
 392
 393         if (!fifo_filename)
 394                 return EXIT_SUCCESS;
 395
 396         fp = xfopen_stdin(fifo_filename);
 397         if (fp != stdin) {
 398                 // For named pipes, we want to support this:
 399                 //  mkfifo cmd_pipe
 400                 //  fbsplash -f cmd_pipe .... &
 401                 //  ...
 402                 //  echo 33 >cmd_pipe
 403                 //  ...
 404                 //  echo 66 >cmd_pipe
 405                 // This means that we don't want fbsplash to get EOF
 406                 // when last writer closes input end.
 407                 // The simplest way is to open fifo for writing too
 408                 // and become an additional writer :)
 409                 open(fifo_filename, O_WRONLY); // errors are ignored
 410         }
 411
 412         fb_drawprogressbar(0);
 413         // Block on read, waiting for some input.
 414         // Use of <stdio.h> style I/O allows to correctly
 415         // handle a case when we have many buffered lines
 416         // already in the pipe
 417         while ((num_buf = xmalloc_fgetline(fp)) != NULL) {
 418                 if (strncmp(num_buf, "exit", 4) == 0) {
 419                         DEBUG_MESSAGE("exit");
 420                         break;
 421                 }
 422                 num = atoi(num_buf);
 423                 if (isdigit(num_buf[0]) && (num <= 100)) {
 424 #if DEBUG
 425                         char strVal[10];
 426                         sprintf(strVal, "%d", num);
 427                         DEBUG_MESSAGE(strVal);
 428 #endif
 429                         fb_drawprogressbar(num);
 430                 }
 431                 free(num_buf);
 432         }
 433
 434         if (bCursorOff) // restore cursor
 435                 full_write(STDOUT_FILENO, "\x1b" "[?25h", 6);
 436
 437         return EXIT_SUCCESS;
 438 }