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Linux/scripts/pnmtologo.c

  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 
 24 static const char *programname;
 25 static const char *filename;
 26 static const char *logoname = "linux_logo";
 27 static const char *outputname;
 28 static 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 
 36 static 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 
 45 struct color {
 46     unsigned char red;
 47     unsigned char green;
 48     unsigned char blue;
 49 };
 50 
 51 static 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 
 71 static int logo_type = LINUX_LOGO_CLUT224;
 72 static unsigned int logo_width;
 73 static unsigned int logo_height;
 74 static struct color **logo_data;
 75 static struct color logo_clut[MAX_LINUX_LOGO_COLORS];
 76 static unsigned int logo_clutsize;
 77 static int is_plain_pbm = 0;
 78 
 79 static void die(const char *fmt, ...)
 80     __attribute__ ((noreturn)) __attribute ((format (printf, 1, 2)));
 81 static void usage(void) __attribute ((noreturn));
 82 
 83 
 84 static unsigned int get_number(FILE *fp)
 85 {
 86     int c, val;
 87 
 88     /* Skip leading whitespace */
 89     do {
 90         c = fgetc(fp);
 91         if (c == EOF)
 92             die("%s: end of file\n", filename);
 93         if (c == '#') {
 94             /* Ignore comments 'till end of line */
 95             do {
 96                 c = fgetc(fp);
 97                 if (c == EOF)
 98                     die("%s: end of file\n", filename);
 99             } while (c != '\n');
100         }
101     } while (isspace(c));
102 
103     /* Parse decimal number */
104     val = 0;
105     while (isdigit(c)) {
106         val = 10*val+c-'';
107         /* some PBM are 'broken'; GiMP for example exports a PBM without space
108          * between the digits. This is Ok cause we know a PBM can only have a '1'
109          * or a '' for the digit. */
110         if (is_plain_pbm)
111                 break;
112         c = fgetc(fp);
113         if (c == EOF)
114             die("%s: end of file\n", filename);
115     }
116     return val;
117 }
118 
119 static unsigned int get_number255(FILE *fp, unsigned int maxval)
120 {
121     unsigned int val = get_number(fp);
122     return (255*val+maxval/2)/maxval;
123 }
124 
125 static void read_image(void)
126 {
127     FILE *fp;
128     unsigned int i, j;
129     int magic;
130     unsigned int maxval;
131 
132     /* open image file */
133     fp = fopen(filename, "r");
134     if (!fp)
135         die("Cannot open file %s: %s\n", filename, strerror(errno));
136 
137     /* check file type and read file header */
138     magic = fgetc(fp);
139     if (magic != 'P')
140         die("%s is not a PNM file\n", filename);
141     magic = fgetc(fp);
142     switch (magic) {
143         case '1':
144         case '2':
145         case '3':
146             /* Plain PBM/PGM/PPM */
147             break;
148 
149         case '4':
150         case '5':
151         case '6':
152             /* Binary PBM/PGM/PPM */
153             die("%s: Binary PNM is not supported\n"
154                 "Use pnmnoraw(1) to convert it to ASCII PNM\n", filename);
155 
156         default:
157             die("%s is not a PNM file\n", filename);
158     }
159     logo_width = get_number(fp);
160     logo_height = get_number(fp);
161 
162     /* allocate image data */
163     logo_data = (struct color **)malloc(logo_height*sizeof(struct color *));
164     if (!logo_data)
165         die("%s\n", strerror(errno));
166     for (i = 0; i < logo_height; i++) {
167         logo_data[i] = malloc(logo_width*sizeof(struct color));
168         if (!logo_data[i])
169             die("%s\n", strerror(errno));
170     }
171 
172     /* read image data */
173     switch (magic) {
174         case '1':
175             /* Plain PBM */
176             is_plain_pbm = 1;
177             for (i = 0; i < logo_height; i++)
178                 for (j = 0; j < logo_width; j++)
179                     logo_data[i][j].red = logo_data[i][j].green =
180                         logo_data[i][j].blue = 255*(1-get_number(fp));
181             break;
182 
183         case '2':
184             /* Plain PGM */
185             maxval = get_number(fp);
186             for (i = 0; i < logo_height; i++)
187                 for (j = 0; j < logo_width; j++)
188                     logo_data[i][j].red = logo_data[i][j].green =
189                         logo_data[i][j].blue = get_number255(fp, maxval);
190             break;
191 
192         case '3':
193             /* Plain PPM */
194             maxval = get_number(fp);
195             for (i = 0; i < logo_height; i++)
196                 for (j = 0; j < logo_width; j++) {
197                     logo_data[i][j].red = get_number255(fp, maxval);
198                     logo_data[i][j].green = get_number255(fp, maxval);
199                     logo_data[i][j].blue = get_number255(fp, maxval);
200                 }
201             break;
202     }
203 
204     /* close file */
205     fclose(fp);
206 }
207 
208 static inline int is_black(struct color c)
209 {
210     return c.red == 0 && c.green == 0 && c.blue == 0;
211 }
212 
213 static inline int is_white(struct color c)
214 {
215     return c.red == 255 && c.green == 255 && c.blue == 255;
216 }
217 
218 static inline int is_gray(struct color c)
219 {
220     return c.red == c.green && c.red == c.blue;
221 }
222 
223 static inline int is_equal(struct color c1, struct color c2)
224 {
225     return c1.red == c2.red && c1.green == c2.green && c1.blue == c2.blue;
226 }
227 
228 static void write_header(void)
229 {
230     /* open logo file */
231     if (outputname) {
232         out = fopen(outputname, "w");
233         if (!out)
234             die("Cannot create file %s: %s\n", outputname, strerror(errno));
235     } else {
236         out = stdout;
237     }
238 
239     fputs("/*\n", out);
240     fputs(" *  DO NOT EDIT THIS FILE!\n", out);
241     fputs(" *\n", out);
242     fprintf(out, " *  It was automatically generated from %s\n", filename);
243     fputs(" *\n", out);
244     fprintf(out, " *  Linux logo %s\n", logoname);
245     fputs(" */\n\n", out);
246     fputs("#include <linux/linux_logo.h>\n\n", out);
247     fprintf(out, "static unsigned char %s_data[] __initdata = {\n",
248             logoname);
249 }
250 
251 static void write_footer(void)
252 {
253     fputs("\n};\n\n", out);
254     fprintf(out, "const struct linux_logo %s __initconst = {\n", logoname);
255     fprintf(out, "\t.type\t\t= %s,\n", logo_types[logo_type]);
256     fprintf(out, "\t.width\t\t= %d,\n", logo_width);
257     fprintf(out, "\t.height\t\t= %d,\n", logo_height);
258     if (logo_type == LINUX_LOGO_CLUT224) {
259         fprintf(out, "\t.clutsize\t= %d,\n", logo_clutsize);
260         fprintf(out, "\t.clut\t\t= %s_clut,\n", logoname);
261     }
262     fprintf(out, "\t.data\t\t= %s_data\n", logoname);
263     fputs("};\n\n", out);
264 
265     /* close logo file */
266     if (outputname)
267         fclose(out);
268 }
269 
270 static int write_hex_cnt;
271 
272 static void write_hex(unsigned char byte)
273 {
274     if (write_hex_cnt % 12)
275         fprintf(out, ", 0x%02x", byte);
276     else if (write_hex_cnt)
277         fprintf(out, ",\n\t0x%02x", byte);
278     else
279         fprintf(out, "\t0x%02x", byte);
280     write_hex_cnt++;
281 }
282 
283 static void write_logo_mono(void)
284 {
285     unsigned int i, j;
286     unsigned char val, bit;
287 
288     /* validate image */
289     for (i = 0; i < logo_height; i++)
290         for (j = 0; j < logo_width; j++)
291             if (!is_black(logo_data[i][j]) && !is_white(logo_data[i][j]))
292                 die("Image must be monochrome\n");
293 
294     /* write file header */
295     write_header();
296 
297     /* write logo data */
298     for (i = 0; i < logo_height; i++) {
299         for (j = 0; j < logo_width;) {
300             for (val = 0, bit = 0x80; bit && j < logo_width; j++, bit >>= 1)
301                 if (logo_data[i][j].red)
302                     val |= bit;
303             write_hex(val);
304         }
305     }
306 
307     /* write logo structure and file footer */
308     write_footer();
309 }
310 
311 static void write_logo_vga16(void)
312 {
313     unsigned int i, j, k;
314     unsigned char val;
315 
316     /* validate image */
317     for (i = 0; i < logo_height; i++)
318         for (j = 0; j < logo_width; j++) {
319             for (k = 0; k < 16; k++)
320                 if (is_equal(logo_data[i][j], clut_vga16[k]))
321                     break;
322             if (k == 16)
323                 die("Image must use the 16 console colors only\n"
324                     "Use ppmquant(1) -map clut_vga16.ppm to reduce the number "
325                     "of colors\n");
326         }
327 
328     /* write file header */
329     write_header();
330 
331     /* write logo data */
332     for (i = 0; i < logo_height; i++)
333         for (j = 0; j < logo_width; j++) {
334             for (k = 0; k < 16; k++)
335                 if (is_equal(logo_data[i][j], clut_vga16[k]))
336                     break;
337             val = k<<4;
338             if (++j < logo_width) {
339                 for (k = 0; k < 16; k++)
340                     if (is_equal(logo_data[i][j], clut_vga16[k]))
341                         break;
342                 val |= k;
343             }
344             write_hex(val);
345         }
346 
347     /* write logo structure and file footer */
348     write_footer();
349 }
350 
351 static void write_logo_clut224(void)
352 {
353     unsigned int i, j, k;
354 
355     /* validate image */
356     for (i = 0; i < logo_height; i++)
357         for (j = 0; j < logo_width; j++) {
358             for (k = 0; k < logo_clutsize; k++)
359                 if (is_equal(logo_data[i][j], logo_clut[k]))
360                     break;
361             if (k == logo_clutsize) {
362                 if (logo_clutsize == MAX_LINUX_LOGO_COLORS)
363                     die("Image has more than %d colors\n"
364                         "Use ppmquant(1) to reduce the number of colors\n",
365                         MAX_LINUX_LOGO_COLORS);
366                 logo_clut[logo_clutsize++] = logo_data[i][j];
367             }
368         }
369 
370     /* write file header */
371     write_header();
372 
373     /* write logo data */
374     for (i = 0; i < logo_height; i++)
375         for (j = 0; j < logo_width; j++) {
376             for (k = 0; k < logo_clutsize; k++)
377                 if (is_equal(logo_data[i][j], logo_clut[k]))
378                     break;
379             write_hex(k+32);
380         }
381     fputs("\n};\n\n", out);
382 
383     /* write logo clut */
384     fprintf(out, "static unsigned char %s_clut[] __initdata = {\n",
385             logoname);
386     write_hex_cnt = 0;
387     for (i = 0; i < logo_clutsize; i++) {
388         write_hex(logo_clut[i].red);
389         write_hex(logo_clut[i].green);
390         write_hex(logo_clut[i].blue);
391     }
392 
393     /* write logo structure and file footer */
394     write_footer();
395 }
396 
397 static void write_logo_gray256(void)
398 {
399     unsigned int i, j;
400 
401     /* validate image */
402     for (i = 0; i < logo_height; i++)
403         for (j = 0; j < logo_width; j++)
404             if (!is_gray(logo_data[i][j]))
405                 die("Image must be grayscale\n");
406 
407     /* write file header */
408     write_header();
409 
410     /* write logo data */
411     for (i = 0; i < logo_height; i++)
412         for (j = 0; j < logo_width; j++)
413             write_hex(logo_data[i][j].red);
414 
415     /* write logo structure and file footer */
416     write_footer();
417 }
418 
419 static void die(const char *fmt, ...)
420 {
421     va_list ap;
422 
423     va_start(ap, fmt);
424     vfprintf(stderr, fmt, ap);
425     va_end(ap);
426 
427     exit(1);
428 }
429 
430 static void usage(void)
431 {
432     die("\n"
433         "Usage: %s [options] <filename>\n"
434         "\n"
435         "Valid options:\n"
436         "    -h          : display this usage information\n"
437         "    -n <name>   : specify logo name (default: linux_logo)\n"
438         "    -o <output> : output to file <output> instead of stdout\n"
439         "    -t <type>   : specify logo type, one of\n"
440         "                      mono    : monochrome black/white\n"
441         "                      vga16   : 16 colors VGA text palette\n"
442         "                      clut224 : 224 colors (default)\n"
443         "                      gray256 : 256 levels grayscale\n"
444         "\n", programname);
445 }
446 
447 int main(int argc, char *argv[])
448 {
449     int opt;
450 
451     programname = argv[0];
452 
453     opterr = 0;
454     while (1) {
455         opt = getopt(argc, argv, "hn:o:t:");
456         if (opt == -1)
457             break;
458 
459         switch (opt) {
460             case 'h':
461                 usage();
462                 break;
463 
464             case 'n':
465                 logoname = optarg;
466                 break;
467 
468             case 'o':
469                 outputname = optarg;
470                 break;
471 
472             case 't':
473                 if (!strcmp(optarg, "mono"))
474                     logo_type = LINUX_LOGO_MONO;
475                 else if (!strcmp(optarg, "vga16"))
476                     logo_type = LINUX_LOGO_VGA16;
477                 else if (!strcmp(optarg, "clut224"))
478                     logo_type = LINUX_LOGO_CLUT224;
479                 else if (!strcmp(optarg, "gray256"))
480                     logo_type = LINUX_LOGO_GRAY256;
481                 else
482                     usage();
483                 break;
484 
485             default:
486                 usage();
487                 break;
488         }
489     }
490     if (optind != argc-1)
491         usage();
492 
493     filename = argv[optind];
494 
495     read_image();
496     switch (logo_type) {
497         case LINUX_LOGO_MONO:
498             write_logo_mono();
499             break;
500 
501         case LINUX_LOGO_VGA16:
502             write_logo_vga16();
503             break;
504 
505         case LINUX_LOGO_CLUT224:
506             write_logo_clut224();
507             break;
508 
509         case LINUX_LOGO_GRAY256:
510             write_logo_gray256();
511             break;
512     }
513     exit(0);
514 }
515 

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