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/Kernel/scripts/pnmtologo.c

https://github.com/chris41g/LoStKernel
C | 508 lines | 387 code | 77 blank | 44 comment | 107 complexity | 7e1995df0f8366e50a96877fe9ba8b88 MD5 | raw file
  1
  2/*
  3 *  Convert a logo in ASCII PNM format to C source suitable for inclusion in
  4 *  the Linux kernel
  5 *
  6 *  (C) Copyright 2001-2003 by Geert Uytterhoeven <geert@linux-m68k.org>
  7 *
  8 *  --------------------------------------------------------------------------
  9 *
 10 *  This file is subject to the terms and conditions of the GNU General Public
 11 *  License. See the file COPYING in the main directory of the Linux
 12 *  distribution for more details.
 13 */
 14
 15#include <ctype.h>
 16#include <errno.h>
 17#include <stdarg.h>
 18#include <stdio.h>
 19#include <stdlib.h>
 20#include <string.h>
 21#include <unistd.h>
 22
 23
 24static const char *programname;
 25static const char *filename;
 26static const char *logoname = "linux_logo";
 27static const char *outputname;
 28static FILE *out;
 29
 30
 31#define LINUX_LOGO_MONO		1	/* monochrome black/white */
 32#define LINUX_LOGO_VGA16	2	/* 16 colors VGA text palette */
 33#define LINUX_LOGO_CLUT224	3	/* 224 colors */
 34#define LINUX_LOGO_GRAY256	4	/* 256 levels grayscale */
 35
 36static const char *logo_types[LINUX_LOGO_GRAY256+1] = {
 37    [LINUX_LOGO_MONO] = "LINUX_LOGO_MONO",
 38    [LINUX_LOGO_VGA16] = "LINUX_LOGO_VGA16",
 39    [LINUX_LOGO_CLUT224] = "LINUX_LOGO_CLUT224",
 40    [LINUX_LOGO_GRAY256] = "LINUX_LOGO_GRAY256"
 41};
 42
 43#define MAX_LINUX_LOGO_COLORS	224
 44
 45struct color {
 46    unsigned char red;
 47    unsigned char green;
 48    unsigned char blue;
 49};
 50
 51static const struct color clut_vga16[16] = {
 52    { 0x00, 0x00, 0x00 },
 53    { 0x00, 0x00, 0xaa },
 54    { 0x00, 0xaa, 0x00 },
 55    { 0x00, 0xaa, 0xaa },
 56    { 0xaa, 0x00, 0x00 },
 57    { 0xaa, 0x00, 0xaa },
 58    { 0xaa, 0x55, 0x00 },
 59    { 0xaa, 0xaa, 0xaa },
 60    { 0x55, 0x55, 0x55 },
 61    { 0x55, 0x55, 0xff },
 62    { 0x55, 0xff, 0x55 },
 63    { 0x55, 0xff, 0xff },
 64    { 0xff, 0x55, 0x55 },
 65    { 0xff, 0x55, 0xff },
 66    { 0xff, 0xff, 0x55 },
 67    { 0xff, 0xff, 0xff },
 68};
 69
 70
 71static int logo_type = LINUX_LOGO_CLUT224;
 72static unsigned int logo_width;
 73static unsigned int logo_height;
 74static struct color **logo_data;
 75static struct color logo_clut[MAX_LINUX_LOGO_COLORS];
 76static unsigned int logo_clutsize;
 77
 78static void die(const char *fmt, ...)
 79    __attribute__ ((noreturn)) __attribute ((format (printf, 1, 2)));
 80static void usage(void) __attribute ((noreturn));
 81
 82
 83static unsigned int get_number(FILE *fp)
 84{
 85    int c, val;
 86
 87    /* Skip leading whitespace */
 88    do {
 89	c = fgetc(fp);
 90	if (c == EOF)
 91	    die("%s: end of file\n", filename);
 92	if (c == '#') {
 93	    /* Ignore comments 'till end of line */
 94	    do {
 95		c = fgetc(fp);
 96		if (c == EOF)
 97		    die("%s: end of file\n", filename);
 98	    } while (c != '\n');
 99	}
100    } while (isspace(c));
101
102    /* Parse decimal number */
103    val = 0;
104    while (isdigit(c)) {
105	val = 10*val+c-'0';
106	c = fgetc(fp);
107	if (c == EOF)
108	    die("%s: end of file\n", filename);
109    }
110    return val;
111}
112
113static unsigned int get_number255(FILE *fp, unsigned int maxval)
114{
115    unsigned int val = get_number(fp);
116    return (255*val+maxval/2)/maxval;
117}
118
119static void read_image(void)
120{
121    FILE *fp;
122    unsigned int i, j;
123    int magic;
124    unsigned int maxval;
125
126    /* open image file */
127    fp = fopen(filename, "r");
128    if (!fp)
129	die("Cannot open file %s: %s\n", filename, strerror(errno));
130
131    /* check file type and read file header */
132    magic = fgetc(fp);
133    if (magic != 'P')
134	die("%s is not a PNM file\n", filename);
135    magic = fgetc(fp);
136    switch (magic) {
137	case '1':
138	case '2':
139	case '3':
140	    /* Plain PBM/PGM/PPM */
141	    break;
142
143	case '4':
144	case '5':
145	case '6':
146	    /* Binary PBM/PGM/PPM */
147	    die("%s: Binary PNM is not supported\n"
148		"Use pnmnoraw(1) to convert it to ASCII PNM\n", filename);
149
150	default:
151	    die("%s is not a PNM file\n", filename);
152    }
153    logo_width = get_number(fp);
154    logo_height = get_number(fp);
155
156    /* allocate image data */
157    logo_data = (struct color **)malloc(logo_height*sizeof(struct color *));
158    if (!logo_data)
159	die("%s\n", strerror(errno));
160    for (i = 0; i < logo_height; i++) {
161	logo_data[i] = malloc(logo_width*sizeof(struct color));
162	if (!logo_data[i])
163	    die("%s\n", strerror(errno));
164    }
165
166    /* read image data */
167    switch (magic) {
168	case '1':
169	    /* Plain PBM */
170	    for (i = 0; i < logo_height; i++)
171		for (j = 0; j < logo_width; j++)
172		    logo_data[i][j].red = logo_data[i][j].green =
173			logo_data[i][j].blue = 255*(1-get_number(fp));
174	    break;
175
176	case '2':
177	    /* Plain PGM */
178	    maxval = get_number(fp);
179	    for (i = 0; i < logo_height; i++)
180		for (j = 0; j < logo_width; j++)
181		    logo_data[i][j].red = logo_data[i][j].green =
182			logo_data[i][j].blue = get_number255(fp, maxval);
183	    break;
184
185	case '3':
186	    /* Plain PPM */
187	    maxval = get_number(fp);
188	    for (i = 0; i < logo_height; i++)
189		for (j = 0; j < logo_width; j++) {
190		    logo_data[i][j].red = get_number255(fp, maxval);
191		    logo_data[i][j].green = get_number255(fp, maxval);
192		    logo_data[i][j].blue = get_number255(fp, maxval);
193		}
194	    break;
195    }
196
197    /* close file */
198    fclose(fp);
199}
200
201static inline int is_black(struct color c)
202{
203    return c.red == 0 && c.green == 0 && c.blue == 0;
204}
205
206static inline int is_white(struct color c)
207{
208    return c.red == 255 && c.green == 255 && c.blue == 255;
209}
210
211static inline int is_gray(struct color c)
212{
213    return c.red == c.green && c.red == c.blue;
214}
215
216static inline int is_equal(struct color c1, struct color c2)
217{
218    return c1.red == c2.red && c1.green == c2.green && c1.blue == c2.blue;
219}
220
221static void write_header(void)
222{
223    /* open logo file */
224    if (outputname) {
225	out = fopen(outputname, "w");
226	if (!out)
227	    die("Cannot create file %s: %s\n", outputname, strerror(errno));
228    } else {
229	out = stdout;
230    }
231
232    fputs("/*\n", out);
233    fputs(" *  DO NOT EDIT THIS FILE!\n", out);
234    fputs(" *\n", out);
235    fprintf(out, " *  It was automatically generated from %s\n", filename);
236    fputs(" *\n", out);
237    fprintf(out, " *  Linux logo %s\n", logoname);
238    fputs(" */\n\n", out);
239    fputs("#include <linux/linux_logo.h>\n\n", out);
240    fprintf(out, "static unsigned char %s_data[] __initdata = {\n",
241	    logoname);
242}
243
244static void write_footer(void)
245{
246    fputs("\n};\n\n", out);
247    fprintf(out, "const struct linux_logo %s __initconst = {\n", logoname);
248    fprintf(out, "\t.type\t\t= %s,\n", logo_types[logo_type]);
249    fprintf(out, "\t.width\t\t= %d,\n", logo_width);
250    fprintf(out, "\t.height\t\t= %d,\n", logo_height);
251    if (logo_type == LINUX_LOGO_CLUT224) {
252	fprintf(out, "\t.clutsize\t= %d,\n", logo_clutsize);
253	fprintf(out, "\t.clut\t\t= %s_clut,\n", logoname);
254    }
255    fprintf(out, "\t.data\t\t= %s_data\n", logoname);
256    fputs("};\n\n", out);
257
258    /* close logo file */
259    if (outputname)
260	fclose(out);
261}
262
263static int write_hex_cnt;
264
265static void write_hex(unsigned char byte)
266{
267    if (write_hex_cnt % 12)
268	fprintf(out, ", 0x%02x", byte);
269    else if (write_hex_cnt)
270	fprintf(out, ",\n\t0x%02x", byte);
271    else
272	fprintf(out, "\t0x%02x", byte);
273    write_hex_cnt++;
274}
275
276static void write_logo_mono(void)
277{
278    unsigned int i, j;
279    unsigned char val, bit;
280
281    /* validate image */
282    for (i = 0; i < logo_height; i++)
283	for (j = 0; j < logo_width; j++)
284	    if (!is_black(logo_data[i][j]) && !is_white(logo_data[i][j]))
285		die("Image must be monochrome\n");
286
287    /* write file header */
288    write_header();
289
290    /* write logo data */
291    for (i = 0; i < logo_height; i++) {
292	for (j = 0; j < logo_width;) {
293	    for (val = 0, bit = 0x80; bit && j < logo_width; j++, bit >>= 1)
294		if (logo_data[i][j].red)
295		    val |= bit;
296	    write_hex(val);
297	}
298    }
299
300    /* write logo structure and file footer */
301    write_footer();
302}
303
304static void write_logo_vga16(void)
305{
306    unsigned int i, j, k;
307    unsigned char val;
308
309    /* validate image */
310    for (i = 0; i < logo_height; i++)
311	for (j = 0; j < logo_width; j++) {
312	    for (k = 0; k < 16; k++)
313		if (is_equal(logo_data[i][j], clut_vga16[k]))
314		    break;
315	    if (k == 16)
316		die("Image must use the 16 console colors only\n"
317		    "Use ppmquant(1) -map clut_vga16.ppm to reduce the number "
318		    "of colors\n");
319	}
320
321    /* write file header */
322    write_header();
323
324    /* write logo data */
325    for (i = 0; i < logo_height; i++)
326	for (j = 0; j < logo_width; j++) {
327	    for (k = 0; k < 16; k++)
328		if (is_equal(logo_data[i][j], clut_vga16[k]))
329		    break;
330	    val = k<<4;
331	    if (++j < logo_width) {
332		for (k = 0; k < 16; k++)
333		    if (is_equal(logo_data[i][j], clut_vga16[k]))
334			break;
335		val |= k;
336	    }
337	    write_hex(val);
338	}
339
340    /* write logo structure and file footer */
341    write_footer();
342}
343
344static void write_logo_clut224(void)
345{
346    unsigned int i, j, k;
347
348    /* validate image */
349    for (i = 0; i < logo_height; i++)
350	for (j = 0; j < logo_width; j++) {
351	    for (k = 0; k < logo_clutsize; k++)
352		if (is_equal(logo_data[i][j], logo_clut[k]))
353		    break;
354	    if (k == logo_clutsize) {
355		if (logo_clutsize == MAX_LINUX_LOGO_COLORS)
356		    die("Image has more than %d colors\n"
357			"Use ppmquant(1) to reduce the number of colors\n",
358			MAX_LINUX_LOGO_COLORS);
359		logo_clut[logo_clutsize++] = logo_data[i][j];
360	    }
361	}
362
363    /* write file header */
364    write_header();
365
366    /* write logo data */
367    for (i = 0; i < logo_height; i++)
368	for (j = 0; j < logo_width; j++) {
369	    for (k = 0; k < logo_clutsize; k++)
370		if (is_equal(logo_data[i][j], logo_clut[k]))
371		    break;
372	    write_hex(k+32);
373	}
374    fputs("\n};\n\n", out);
375
376    /* write logo clut */
377    fprintf(out, "static unsigned char %s_clut[] __initdata = {\n",
378	    logoname);
379    write_hex_cnt = 0;
380    for (i = 0; i < logo_clutsize; i++) {
381	write_hex(logo_clut[i].red);
382	write_hex(logo_clut[i].green);
383	write_hex(logo_clut[i].blue);
384    }
385
386    /* write logo structure and file footer */
387    write_footer();
388}
389
390static void write_logo_gray256(void)
391{
392    unsigned int i, j;
393
394    /* validate image */
395    for (i = 0; i < logo_height; i++)
396	for (j = 0; j < logo_width; j++)
397	    if (!is_gray(logo_data[i][j]))
398		die("Image must be grayscale\n");
399
400    /* write file header */
401    write_header();
402
403    /* write logo data */
404    for (i = 0; i < logo_height; i++)
405	for (j = 0; j < logo_width; j++)
406	    write_hex(logo_data[i][j].red);
407
408    /* write logo structure and file footer */
409    write_footer();
410}
411
412static void die(const char *fmt, ...)
413{
414    va_list ap;
415
416    va_start(ap, fmt);
417    vfprintf(stderr, fmt, ap);
418    va_end(ap);
419
420    exit(1);
421}
422
423static void usage(void)
424{
425    die("\n"
426	"Usage: %s [options] <filename>\n"
427	"\n"
428	"Valid options:\n"
429	"    -h          : display this usage information\n"
430	"    -n <name>   : specify logo name (default: linux_logo)\n"
431	"    -o <output> : output to file <output> instead of stdout\n"
432	"    -t <type>   : specify logo type, one of\n"
433	"                      mono    : monochrome black/white\n"
434	"                      vga16   : 16 colors VGA text palette\n"
435	"                      clut224 : 224 colors (default)\n"
436	"                      gray256 : 256 levels grayscale\n"
437	"\n", programname);
438}
439
440int main(int argc, char *argv[])
441{
442    int opt;
443
444    programname = argv[0];
445
446    opterr = 0;
447    while (1) {
448	opt = getopt(argc, argv, "hn:o:t:");
449	if (opt == -1)
450	    break;
451
452	switch (opt) {
453	    case 'h':
454		usage();
455		break;
456
457	    case 'n':
458		logoname = optarg;
459		break;
460
461	    case 'o':
462		outputname = optarg;
463		break;
464
465	    case 't':
466		if (!strcmp(optarg, "mono"))
467		    logo_type = LINUX_LOGO_MONO;
468		else if (!strcmp(optarg, "vga16"))
469		    logo_type = LINUX_LOGO_VGA16;
470		else if (!strcmp(optarg, "clut224"))
471		    logo_type = LINUX_LOGO_CLUT224;
472		else if (!strcmp(optarg, "gray256"))
473		    logo_type = LINUX_LOGO_GRAY256;
474		else
475		    usage();
476		break;
477
478	    default:
479		usage();
480		break;
481	}
482    }
483    if (optind != argc-1)
484	usage();
485
486    filename = argv[optind];
487
488    read_image();
489    switch (logo_type) {
490	case LINUX_LOGO_MONO:
491	    write_logo_mono();
492	    break;
493
494	case LINUX_LOGO_VGA16:
495	    write_logo_vga16();
496	    break;
497
498	case LINUX_LOGO_CLUT224:
499	    write_logo_clut224();
500	    break;
501
502	case LINUX_LOGO_GRAY256:
503	    write_logo_gray256();
504	    break;
505    }
506    exit(0);
507}
508