hush/miscutils/fbsplash.c
Dan Fandrich 07078c2966 Let fbsplash display images even when a second buffer is active
If a previous application uses double buffering and makes the
second buffer visible, fbsplash's images (written to the first
buffer) otherwise won't be visible.

Signed-off-by: Dan Fandrich <dan@coneharvesters.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2011-02-05 03:34:52 +01:00

414 lines
10 KiB
C

/* 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.
*/
#include "libbb.h"
#include <linux/fb.h>
/* If you want logging messages on /tmp/fbsplash.log... */
#define DEBUG 0
#define BYTES_PER_PIXEL 2
typedef unsigned short DATA;
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;
};
#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
/**
* 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);
if (G.scr_var.bits_per_pixel != 16)
bb_error_msg_and_die("only 16 bpp is supported");
// map the device in memory
G.addr = mmap(NULL,
G.scr_var.xres * G.scr_var.yres_virtual
* BYTES_PER_PIXEL /*(G.scr_var.bits_per_pixel / 8)*/,
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 * BYTES_PER_PIXEL;
close(fbfd);
}
/**
* Draw hollow rectangle on framebuffer
*/
static void fb_drawrectangle(void)
{
int cnt;
DATA thispix;
DATA *ptr1, *ptr2;
unsigned char nred = G.nbar_colr/2;
unsigned char ngreen = G.nbar_colg/2;
unsigned char nblue = G.nbar_colb/2;
nred >>= 3; // 5-bit red
ngreen >>= 2; // 6-bit green
nblue >>= 3; // 5-bit blue
thispix = nblue + (ngreen << 5) + (nred << (5+6));
// horizontal lines
ptr1 = (DATA*)(G.addr + (G.nbar_posy * G.scr_var.xres + G.nbar_posx) * BYTES_PER_PIXEL);
ptr2 = (DATA*)(G.addr + ((G.nbar_posy + G.nbar_height - 1) * G.scr_var.xres + G.nbar_posx) * BYTES_PER_PIXEL);
cnt = G.nbar_width - 1;
do {
*ptr1++ = thispix;
*ptr2++ = thispix;
} while (--cnt >= 0);
// vertical lines
ptr1 = (DATA*)(G.addr + (G.nbar_posy * G.scr_var.xres + G.nbar_posx) * BYTES_PER_PIXEL);
ptr2 = (DATA*)(G.addr + (G.nbar_posy * G.scr_var.xres + G.nbar_posx + G.nbar_width - 1) * BYTES_PER_PIXEL);
cnt = G.nbar_height - 1;
do {
*ptr1 = thispix; ptr1 += G.scr_var.xres;
*ptr2 = thispix; ptr2 += G.scr_var.xres;
} 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;
DATA thispix;
DATA *ptr;
nred >>= 3; // 5-bit red
ngreen >>= 2; // 6-bit green
nblue >>= 3; // 5-bit blue
thispix = nblue + (ngreen << 5) + (nred << (5+6));
cnt1 = ny2pos - ny1pos;
nypos = ny1pos;
do {
ptr = (DATA*)(G.addr + (nypos * G.scr_var.xres + nx1pos) * BYTES_PER_PIXEL);
cnt2 = nx2pos - nx1pos;
do {
*ptr++ = thispix;
} 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 i, left_x, top_y, 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 ((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 ((height | width) < 0)
return;
fb_drawfullrectangle(
left_x, top_y,
left_x + width, top_y + height,
G.nbar_colr, G.nbar_colg, G.nbar_colb);
if (percent > 0) {
// actual progress bar
width = width * percent / 100;
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, top_y, left_x + width, top_y,
gray_level, gray_level, gray_level);
top_y++;
i--;
}
}
}
/**
* 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;
DATA *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 = (DATA *)(G.addr + j * G.scr_fix.line_length);
for (i = 0; i < width; i++) {
unsigned thispix;
thispix = (((unsigned)pixel[0] << 8) & 0xf800)
| (((unsigned)pixel[1] << 3) & 0x07e0)
| (((unsigned)pixel[2] >> 3));
*src++ = thispix;
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;
}