aboutsummaryrefslogtreecommitdiff
path: root/miscutils/fbsplash.c
blob: c6509555c940b34052c530dde63ed54afc39dcc4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
/* 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 tarball for details.
 *
 * 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
			* 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("can't mmap %s", strfb_device);
	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_posy + G.nbar_height - 1 - G.nbar_posy;
	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)
{
	char head[256];
	char s[80];
	FILE *theme_file;
	unsigned char *pixline;
	unsigned i, j, width, height, line_size;

	memset(head, 0, sizeof(head));
	theme_file = xfopen_stdin(G.image_filename);

	// parse ppm header
	while (1) {
		if (fgets(s, sizeof(s), theme_file) == NULL)
			bb_error_msg_and_die("bad PPM file '%s'", G.image_filename);

		if (s[0] == '#')
			continue;

		if (strlen(head) + strlen(s) >= sizeof(head))
			bb_error_msg_and_die("bad PPM file '%s'", G.image_filename);

		strcat(head, s);
		if (head[0] != 'P' || head[1] != '6')
			bb_error_msg_and_die("bad PPM file '%s'", G.image_filename);

		// width, height, max_color_val
		if (sscanf(head, "P6 %u %u %u", &width, &height, &i) == 3)
			break;
// TODO: i must be <= 255!
	}

	line_size = width*3;
	if (width > G.scr_var.xres)
		width = G.scr_var.xres;
	if (height > G.scr_var.yres)
		height = G.scr_var.yres;

	pixline = xmalloc(line_size);
	for (j = 0; j < height; j++) {
		unsigned char *pixel = pixline;
		DATA *src = (DATA *)(G.addr + j * G.scr_fix.line_length);

		if (fread(pixline, 1, line_size, theme_file) != line_size)
			bb_error_msg_and_die("bad PPM file '%s'", G.image_filename);
		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 const 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_u(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, "\x1b" "[?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
			char strVal[10];
			sprintf(strVal, "%d", num);
			DEBUG_MESSAGE(strVal);
#endif
			fb_drawprogressbar(num);
		}
		free(num_buf);
	}

	if (bCursorOff) // restore cursor
		full_write(STDOUT_FILENO, "\x1b" "[?25h", 6);

	return EXIT_SUCCESS;
}