busybox/miscutils/fbsplash.c

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/* vi: set sw=4 ts=4: */
/*
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* 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] &
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* -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;
};
#define G (*ptr_to_globals)
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#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.bytes_per_pixel = (G.scr_var.bits_per_pixel + 7) >> 3;
// map the device in memory
G.addr = mmap(NULL,
G.scr_var.xres * G.scr_var.yres * G.bytes_per_pixel,
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
*/
static unsigned fb_pixel_value(unsigned r, unsigned g, unsigned b)
{
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) {
r = (r & 0xf8) << 8; // 5-bit red
g = (g & 0xfc) << 3; // 6-bit green
b = b >> 3; // 5-bit blue
return r + g + b;
}
// 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_var.xres + G.nbar_posx) * G.bytes_per_pixel;
ptr2 = G.addr + ((G.nbar_posy + G.nbar_height - 1) * G.scr_var.xres + 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_var.xres + G.nbar_posx) * G.bytes_per_pixel;
ptr2 = G.addr + (G.nbar_posy * G.scr_var.xres + 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_var.xres * G.bytes_per_pixel;
ptr2 += G.scr_var.xres * G.bytes_per_pixel;
} 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);
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cnt1 = ny2pos - ny1pos;
nypos = ny1pos;
do {
ptr = G.addr + (nypos * G.scr_var.xres + nx1pos) * G.bytes_per_pixel;
cnt2 = nx2pos - nx1pos;
do {
fb_write_pixel(ptr, thispix);
ptr += G.bytes_per_pixel;
} while (--cnt2 >= 0);
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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 y;
unsigned i;
// 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 + 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;
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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;
}