source: MondoRescue/branches/3.2/mindi-busybox/miscutils/fbsplash.c@ 3232

/* vi: set sw=4 ts=4: */
/*
 * Copyright (C) 2008 Michele Sanges <michele.sanges@gmail.com>
 *
 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
 *
 * Usage:
 * - use kernel option 'vga=xxx' or otherwise enable framebuffer device.
 * - put somewhere fbsplash.cfg file and an image in .ppm format.
 * - run applet: $ setsid fbsplash [params] &
 *      -c: hide cursor
 *      -d /dev/fbN: framebuffer device (if not /dev/fb0)
 *      -s path_to_image_file (can be "-" for stdin)
 *      -i path_to_cfg_file
 *      -f path_to_fifo (can be "-" for stdin)
 * - if you want to run it only in presence of a kernel parameter
 *   (for example fbsplash=on), use:
 *   grep -q "fbsplash=on" </proc/cmdline && setsid fbsplash [params]
 * - commands for fifo:
 *   "NN" (ASCII decimal number) - percentage to show on progress bar.
 *   "exit" (or just close fifo) - well you guessed it.
 */

//usage:#define fbsplash_trivial_usage
//usage:       "-s IMGFILE [-c] [-d DEV] [-i INIFILE] [-f CMD]"
//usage:#define fbsplash_full_usage "\n\n"
//usage:       "    -s  Image"
//usage:     "\n    -c  Hide cursor"
//usage:     "\n    -d  Framebuffer device (default /dev/fb0)"
//usage:     "\n    -i  Config file (var=value):"
//usage:     "\n            BAR_LEFT,BAR_TOP,BAR_WIDTH,BAR_HEIGHT"
//usage:     "\n            BAR_R,BAR_G,BAR_B"
//usage:     "\n    -f  Control pipe (else exit after drawing image)"
//usage:     "\n            commands: 'NN' (% for progress bar) or 'exit'"

#include "libbb.h"
#include <linux/fb.h>

/* If you want logging messages on /tmp/fbsplash.log... */
#define DEBUG 0

struct globals {
#if DEBUG
    bool bdebug_messages;   // enable/disable logging
    FILE *logfile_fd;   // log file
#endif
    unsigned char *addr;    // pointer to framebuffer memory
    unsigned ns[7];     // n-parameters
    const char *image_filename;
    struct fb_var_screeninfo scr_var;
    struct fb_fix_screeninfo scr_fix;
    unsigned bytes_per_pixel;
    // cached (8 - scr_var.COLOR.length):
    unsigned red_shift;
    unsigned green_shift;
    unsigned blue_shift;
};
#define G (*ptr_to_globals)
#define INIT_G() do { \
    SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
} while (0)

#define nbar_width  ns[0]   // progress bar width
#define nbar_height ns[1]   // progress bar height
#define nbar_posx   ns[2]   // progress bar horizontal position
#define nbar_posy   ns[3]   // progress bar vertical position
#define nbar_colr   ns[4]   // progress bar color red component
#define nbar_colg   ns[5]   // progress bar color green component
#define nbar_colb   ns[6]   // progress bar color blue component

#if DEBUG
#define DEBUG_MESSAGE(strMessage, args...) \
    if (G.bdebug_messages) { \
        fprintf(G.logfile_fd, "[%s][%s] - %s\n", \
        __FILE__, __FUNCTION__, strMessage);    \
    }
#else
#define DEBUG_MESSAGE(...) ((void)0)
#endif

/**
 * Configure palette for RGB:332
 */
static void fb_setpal(int fd)
{
    struct fb_cmap cmap;
    /* fb colors are 16 bit */
    unsigned short red[256], green[256], blue[256];
    unsigned i;

    /* RGB:332 */
    for (i = 0; i < 256; i++) {
        /* Color is encoded in pixel value as rrrgggbb.
         * 3-bit color is mapped to 16-bit one as:
         * 000 -> 00000000 00000000
         * 001 -> 00100100 10010010
         * ...
         * 011 -> 01101101 10110110
         * 100 -> 10010010 01001001
         * ...
         * 111 -> 11111111 11111111
         */
        red[i]   = (( i >> 5       ) * 0x9249) >> 2; // rrr * 00 10010010 01001001 >> 2
        green[i] = (((i >> 2) & 0x7) * 0x9249) >> 2; // ggg * 00 10010010 01001001 >> 2
        /* 2-bit color is easier: */
        blue[i]  =  ( i       & 0x3) * 0x5555; // bb * 01010101 01010101
    }

    cmap.start = 0;
    cmap.len   = 256;
    cmap.red   = red;
    cmap.green = green;
    cmap.blue  = blue;
    cmap.transp = 0;

    xioctl(fd, FBIOPUTCMAP, &cmap);
}

/**
 * Open and initialize the framebuffer device
 * \param *strfb_device pointer to framebuffer device
 */
static void fb_open(const char *strfb_device)
{
    int fbfd = xopen(strfb_device, O_RDWR);

    // framebuffer properties
    xioctl(fbfd, FBIOGET_VSCREENINFO, &G.scr_var);
    xioctl(fbfd, FBIOGET_FSCREENINFO, &G.scr_fix);

    switch (G.scr_var.bits_per_pixel) {
    case 8:
        fb_setpal(fbfd);
        break;

    case 16:
    case 24:
    case 32:
        break;

    default:
        bb_error_msg_and_die("unsupported %u bpp", (int)G.scr_var.bits_per_pixel);
        break;
    }

    G.red_shift   = 8 - G.scr_var.red.length;
    G.green_shift = 8 - G.scr_var.green.length;
    G.blue_shift  = 8 - G.scr_var.blue.length;
    G.bytes_per_pixel = (G.scr_var.bits_per_pixel + 7) >> 3;

    // map the device in memory
    G.addr = mmap(NULL,
            G.scr_var.yres * G.scr_fix.line_length,
            PROT_WRITE, MAP_SHARED, fbfd, 0);
    if (G.addr == MAP_FAILED)
        bb_perror_msg_and_die("mmap");

    // point to the start of the visible screen
    G.addr += G.scr_var.yoffset * G.scr_fix.line_length + G.scr_var.xoffset * G.bytes_per_pixel;
    close(fbfd);
}


/**
 * Return pixel value of the passed RGB color.
 * This is performance critical fn.
 */
static unsigned fb_pixel_value(unsigned r, unsigned g, unsigned b)
{
    /* We assume that the r,g,b values are <= 255 */

    if (G.bytes_per_pixel == 1) {
        r = r        & 0xe0; // 3-bit red
        g = (g >> 3) & 0x1c; // 3-bit green
        b =  b >> 6;         // 2-bit blue
        return r + g + b;
    }
    if (G.bytes_per_pixel == 2) {
        // ARM PL110 on Integrator/CP has RGBA5551 bit arrangement.
        // We want to support bit locations like that.
        //
        // First shift out unused bits
        r = r >> G.red_shift;
        g = g >> G.green_shift;
        b = b >> G.blue_shift;
        // Then shift the remaining bits to their offset
        return (r << G.scr_var.red.offset) +
            (g << G.scr_var.green.offset) +
            (b << G.scr_var.blue.offset);
    }
    // RGB 888
    return b + (g << 8) + (r << 16);
}

/**
 * Draw pixel on framebuffer
 */
static void fb_write_pixel(unsigned char *addr, unsigned pixel)
{
    switch (G.bytes_per_pixel) {
    case 1:
        *addr = pixel;
        break;
    case 2:
        *(uint16_t *)addr = pixel;
        break;
    case 4:
        *(uint32_t *)addr = pixel;
        break;
    default: // 24 bits per pixel
        addr[0] = pixel;
        addr[1] = pixel >> 8;
        addr[2] = pixel >> 16;
    }
}


/**
 * Draw hollow rectangle on framebuffer
 */
static void fb_drawrectangle(void)
{
    int cnt;
    unsigned thispix;
    unsigned char *ptr1, *ptr2;
    unsigned char nred = G.nbar_colr/2;
    unsigned char ngreen =  G.nbar_colg/2;
    unsigned char nblue = G.nbar_colb/2;

    thispix = fb_pixel_value(nred, ngreen, nblue);

    // horizontal lines
    ptr1 = G.addr + G.nbar_posy * G.scr_fix.line_length + G.nbar_posx * G.bytes_per_pixel;
    ptr2 = G.addr + (G.nbar_posy + G.nbar_height - 1) * G.scr_fix.line_length + G.nbar_posx * G.bytes_per_pixel;
    cnt = G.nbar_width - 1;
    do {
        fb_write_pixel(ptr1, thispix);
        fb_write_pixel(ptr2, thispix);
        ptr1 += G.bytes_per_pixel;
        ptr2 += G.bytes_per_pixel;
    } while (--cnt >= 0);

    // vertical lines
    ptr1 = G.addr + G.nbar_posy * G.scr_fix.line_length + G.nbar_posx * G.bytes_per_pixel;
    ptr2 = G.addr + G.nbar_posy * G.scr_fix.line_length + (G.nbar_posx + G.nbar_width - 1) * G.bytes_per_pixel;
    cnt = G.nbar_height - 1;
    do {
        fb_write_pixel(ptr1, thispix);
        fb_write_pixel(ptr2, thispix);
        ptr1 += G.scr_fix.line_length;
        ptr2 += G.scr_fix.line_length;
    } while (--cnt >= 0);
}


/**
 * Draw filled rectangle on framebuffer
 * \param nx1pos,ny1pos upper left position
 * \param nx2pos,ny2pos down right position
 * \param nred,ngreen,nblue rgb color
 */
static void fb_drawfullrectangle(int nx1pos, int ny1pos, int nx2pos, int ny2pos,
    unsigned char nred, unsigned char ngreen, unsigned char nblue)
{
    int cnt1, cnt2, nypos;
    unsigned thispix;
    unsigned char *ptr;

    thispix = fb_pixel_value(nred, ngreen, nblue);

    cnt1 = ny2pos - ny1pos;
    nypos = ny1pos;
    do {
        ptr = G.addr + nypos * G.scr_fix.line_length + nx1pos * G.bytes_per_pixel;
        cnt2 = nx2pos - nx1pos;
        do {
            fb_write_pixel(ptr, thispix);
            ptr += G.bytes_per_pixel;
        } while (--cnt2 >= 0);

        nypos++;
    } while (--cnt1 >= 0);
}


/**
 * Draw a progress bar on framebuffer
 * \param percent percentage of loading
 */
static void fb_drawprogressbar(unsigned percent)
{
    int left_x, top_y, pos_x;
    unsigned width, height;

    // outer box
    left_x = G.nbar_posx;
    top_y = G.nbar_posy;
    width = G.nbar_width - 1;
    height = G.nbar_height - 1;
    if ((int)(height | width) < 0)
        return;
    // NB: "width" of 1 actually makes rect with width of 2!
    fb_drawrectangle();

    // inner "empty" rectangle
    left_x++;
    top_y++;
    width -= 2;
    height -= 2;
    if ((int)(height | width) < 0)
        return;

    pos_x = left_x;
    if (percent > 0) {
        int i, y;

        // actual progress bar
        pos_x += (unsigned)(width * percent) / 100;

        y = top_y;
        i = height;
        if (height == 0)
            height++; // divide by 0 is bad
        while (i >= 0) {
            // draw one-line thick "rectangle"
            // top line will have gray lvl 200, bottom one 100
            unsigned gray_level = 100 + (unsigned)i*100 / height;
            fb_drawfullrectangle(
                    left_x, y, pos_x, y,
                    gray_level, gray_level, gray_level);
            y++;
            i--;
        }
    }

    fb_drawfullrectangle(
            pos_x, top_y,
            left_x + width, top_y + height,
            G.nbar_colr, G.nbar_colg, G.nbar_colb);
}


/**
 * Draw image from PPM file
 */
static void fb_drawimage(void)
{
    FILE *theme_file;
    char *read_ptr;
    unsigned char *pixline;
    unsigned i, j, width, height, line_size;

    if (LONE_DASH(G.image_filename)) {
        theme_file = stdin;
    } else {
        int fd = open_zipped(G.image_filename);
        if (fd < 0)
            bb_simple_perror_msg_and_die(G.image_filename);
        theme_file = xfdopen_for_read(fd);
    }

    /* Parse ppm header:
     * - Magic: two characters "P6".
     * - Whitespace (blanks, TABs, CRs, LFs).
     * - A width, formatted as ASCII characters in decimal.
     * - Whitespace.
     * - A height, ASCII decimal.
     * - Whitespace.
     * - The maximum color value, ASCII decimal, in 0..65535
     * - Newline or other single whitespace character.
     *   (we support newline only)
     * - A raster of Width * Height pixels in triplets of rgb
     *   in pure binary by 1 or 2 bytes. (we support only 1 byte)
     */
#define concat_buf bb_common_bufsiz1
    read_ptr = concat_buf;
    while (1) {
        int w, h, max_color_val;
        int rem = concat_buf + sizeof(concat_buf) - read_ptr;
        if (rem < 2
         || fgets(read_ptr, rem, theme_file) == NULL
        ) {
            bb_error_msg_and_die("bad PPM file '%s'", G.image_filename);
        }
        read_ptr = strchrnul(read_ptr, '#');
        *read_ptr = '\0'; /* ignore #comments */
        if (sscanf(concat_buf, "P6 %u %u %u", &w, &h, &max_color_val) == 3
         && max_color_val <= 255
        ) {
            width = w; /* w is on stack, width may be in register */
            height = h;
            break;
        }
    }

    line_size = width*3;
    pixline = xmalloc(line_size);

    if (width > G.scr_var.xres)
        width = G.scr_var.xres;
    if (height > G.scr_var.yres)
        height = G.scr_var.yres;
    for (j = 0; j < height; j++) {
        unsigned char *pixel;
        unsigned char *src;

        if (fread(pixline, 1, line_size, theme_file) != line_size)
            bb_error_msg_and_die("bad PPM file '%s'", G.image_filename);
        pixel = pixline;
        src = G.addr + j * G.scr_fix.line_length;
        for (i = 0; i < width; i++) {
            unsigned thispix = fb_pixel_value(pixel[0], pixel[1], pixel[2]);
            fb_write_pixel(src, thispix);
            src += G.bytes_per_pixel;
            pixel += 3;
        }
    }
    free(pixline);
    fclose(theme_file);
}


/**
 * Parse configuration file
 * \param *cfg_filename name of the configuration file
 */
static void init(const char *cfg_filename)
{
    static const char param_names[] ALIGN1 =
        "BAR_WIDTH\0" "BAR_HEIGHT\0"
        "BAR_LEFT\0" "BAR_TOP\0"
        "BAR_R\0" "BAR_G\0" "BAR_B\0"
#if DEBUG
        "DEBUG\0"
#endif
        ;
    char *token[2];
    parser_t *parser = config_open2(cfg_filename, xfopen_stdin);
    while (config_read(parser, token, 2, 2, "#=",
                (PARSE_NORMAL | PARSE_MIN_DIE) & ~(PARSE_TRIM | PARSE_COLLAPSE))) {
        unsigned val = xatoi_positive(token[1]);
        int i = index_in_strings(param_names, token[0]);
        if (i < 0)
            bb_error_msg_and_die("syntax error: %s", token[0]);
        if (i >= 0 && i < 7)
            G.ns[i] = val;
#if DEBUG
        if (i == 7) {
            G.bdebug_messages = val;
            if (G.bdebug_messages)
                G.logfile_fd = xfopen_for_write("/tmp/fbsplash.log");
        }
#endif
    }
    config_close(parser);
}


int fbsplash_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int fbsplash_main(int argc UNUSED_PARAM, char **argv)
{
    const char *fb_device, *cfg_filename, *fifo_filename;
    FILE *fp = fp; // for compiler
    char *num_buf;
    unsigned num;
    bool bCursorOff;

    INIT_G();

    // parse command line options
    fb_device = "/dev/fb0";
    cfg_filename = NULL;
    fifo_filename = NULL;
    bCursorOff = 1 & getopt32(argv, "cs:d:i:f:",
            &G.image_filename, &fb_device, &cfg_filename, &fifo_filename);

    // parse configuration file
    if (cfg_filename)
        init(cfg_filename);

    // We must have -s IMG
    if (!G.image_filename)
        bb_show_usage();

    fb_open(fb_device);

    if (fifo_filename && bCursorOff) {
        // hide cursor (BEFORE any fb ops)
        full_write(STDOUT_FILENO, "\033[?25l", 6);
    }

    fb_drawimage();

    if (!fifo_filename)
        return EXIT_SUCCESS;

    fp = xfopen_stdin(fifo_filename);
    if (fp != stdin) {
        // For named pipes, we want to support this:
        //  mkfifo cmd_pipe
        //  fbsplash -f cmd_pipe .... &
        //  ...
        //  echo 33 >cmd_pipe
        //  ...
        //  echo 66 >cmd_pipe
        // This means that we don't want fbsplash to get EOF
        // when last writer closes input end.
        // The simplest way is to open fifo for writing too
        // and become an additional writer :)
        open(fifo_filename, O_WRONLY); // errors are ignored
    }

    fb_drawprogressbar(0);
    // Block on read, waiting for some input.
    // Use of <stdio.h> style I/O allows to correctly
    // handle a case when we have many buffered lines
    // already in the pipe
    while ((num_buf = xmalloc_fgetline(fp)) != NULL) {
        if (strncmp(num_buf, "exit", 4) == 0) {
            DEBUG_MESSAGE("exit");
            break;
        }
        num = atoi(num_buf);
        if (isdigit(num_buf[0]) && (num <= 100)) {
#if DEBUG
            DEBUG_MESSAGE(itoa(num));
#endif
            fb_drawprogressbar(num);
        }
        free(num_buf);
    }

    if (bCursorOff) // restore cursor
        full_write(STDOUT_FILENO, "\033[?25h", 6);

    return EXIT_SUCCESS;
}