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508 lines
12 KiB
508 lines
12 KiB
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/*
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* Convert a logo in ASCII PNM format to C source suitable for inclusion in
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* the Linux kernel
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*
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* (C) Copyright 2001-2003 by Geert Uytterhoeven <geert@linux-m68k.org>
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*
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* --------------------------------------------------------------------------
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of the Linux
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* distribution for more details.
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*/
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#include <ctype.h>
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#include <errno.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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static const char *programname;
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static const char *filename;
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static const char *logoname = "linux_logo";
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static const char *outputname;
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static FILE *out;
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#define LINUX_LOGO_MONO 1 /* monochrome black/white */
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#define LINUX_LOGO_VGA16 2 /* 16 colors VGA text palette */
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#define LINUX_LOGO_CLUT224 3 /* 224 colors */
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#define LINUX_LOGO_GRAY256 4 /* 256 levels grayscale */
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static const char *logo_types[LINUX_LOGO_GRAY256+1] = {
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[LINUX_LOGO_MONO] = "LINUX_LOGO_MONO",
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[LINUX_LOGO_VGA16] = "LINUX_LOGO_VGA16",
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[LINUX_LOGO_CLUT224] = "LINUX_LOGO_CLUT224",
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[LINUX_LOGO_GRAY256] = "LINUX_LOGO_GRAY256"
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};
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#define MAX_LINUX_LOGO_COLORS 224
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struct color {
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unsigned char red;
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unsigned char green;
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unsigned char blue;
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};
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static const struct color clut_vga16[16] = {
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{ 0x00, 0x00, 0x00 },
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{ 0x00, 0x00, 0xaa },
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{ 0x00, 0xaa, 0x00 },
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{ 0x00, 0xaa, 0xaa },
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{ 0xaa, 0x00, 0x00 },
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{ 0xaa, 0x00, 0xaa },
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{ 0xaa, 0x55, 0x00 },
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{ 0xaa, 0xaa, 0xaa },
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{ 0x55, 0x55, 0x55 },
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{ 0x55, 0x55, 0xff },
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{ 0x55, 0xff, 0x55 },
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{ 0x55, 0xff, 0xff },
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{ 0xff, 0x55, 0x55 },
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{ 0xff, 0x55, 0xff },
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{ 0xff, 0xff, 0x55 },
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{ 0xff, 0xff, 0xff },
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};
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static int logo_type = LINUX_LOGO_CLUT224;
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static unsigned int logo_width;
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static unsigned int logo_height;
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static struct color **logo_data;
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static struct color logo_clut[MAX_LINUX_LOGO_COLORS];
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static unsigned int logo_clutsize;
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static void die(const char *fmt, ...)
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__attribute__ ((noreturn)) __attribute ((format (printf, 1, 2)));
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static void usage(void) __attribute ((noreturn));
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static unsigned int get_number(FILE *fp)
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{
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int c, val;
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/* Skip leading whitespace */
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do {
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c = fgetc(fp);
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if (c == EOF)
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die("%s: end of file\n", filename);
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if (c == '#') {
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/* Ignore comments 'till end of line */
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do {
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c = fgetc(fp);
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if (c == EOF)
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die("%s: end of file\n", filename);
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} while (c != '\n');
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}
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} while (isspace(c));
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/* Parse decimal number */
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val = 0;
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while (isdigit(c)) {
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val = 10*val+c-'0';
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c = fgetc(fp);
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if (c == EOF)
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die("%s: end of file\n", filename);
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}
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return val;
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}
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static unsigned int get_number255(FILE *fp, unsigned int maxval)
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{
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unsigned int val = get_number(fp);
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return (255*val+maxval/2)/maxval;
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}
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static void read_image(void)
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{
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FILE *fp;
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unsigned int i, j;
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int magic;
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unsigned int maxval;
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/* open image file */
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fp = fopen(filename, "r");
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if (!fp)
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die("Cannot open file %s: %s\n", filename, strerror(errno));
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/* check file type and read file header */
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magic = fgetc(fp);
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if (magic != 'P')
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die("%s is not a PNM file\n", filename);
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magic = fgetc(fp);
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switch (magic) {
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case '1':
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case '2':
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case '3':
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/* Plain PBM/PGM/PPM */
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break;
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case '4':
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case '5':
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case '6':
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/* Binary PBM/PGM/PPM */
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die("%s: Binary PNM is not supported\n"
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"Use pnmnoraw(1) to convert it to ASCII PNM\n", filename);
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default:
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die("%s is not a PNM file\n", filename);
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}
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logo_width = get_number(fp);
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logo_height = get_number(fp);
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/* allocate image data */
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logo_data = (struct color **)malloc(logo_height*sizeof(struct color *));
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if (!logo_data)
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die("%s\n", strerror(errno));
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for (i = 0; i < logo_height; i++) {
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logo_data[i] = malloc(logo_width*sizeof(struct color));
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if (!logo_data[i])
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die("%s\n", strerror(errno));
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}
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/* read image data */
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switch (magic) {
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case '1':
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/* Plain PBM */
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for (i = 0; i < logo_height; i++)
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for (j = 0; j < logo_width; j++)
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logo_data[i][j].red = logo_data[i][j].green =
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logo_data[i][j].blue = 255*(1-get_number(fp));
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break;
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case '2':
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/* Plain PGM */
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maxval = get_number(fp);
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for (i = 0; i < logo_height; i++)
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for (j = 0; j < logo_width; j++)
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logo_data[i][j].red = logo_data[i][j].green =
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logo_data[i][j].blue = get_number255(fp, maxval);
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break;
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case '3':
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/* Plain PPM */
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maxval = get_number(fp);
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for (i = 0; i < logo_height; i++)
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for (j = 0; j < logo_width; j++) {
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logo_data[i][j].red = get_number255(fp, maxval);
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logo_data[i][j].green = get_number255(fp, maxval);
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logo_data[i][j].blue = get_number255(fp, maxval);
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}
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break;
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}
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/* close file */
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fclose(fp);
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}
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static inline int is_black(struct color c)
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{
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return c.red == 0 && c.green == 0 && c.blue == 0;
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}
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static inline int is_white(struct color c)
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{
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return c.red == 255 && c.green == 255 && c.blue == 255;
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}
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static inline int is_gray(struct color c)
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{
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return c.red == c.green && c.red == c.blue;
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}
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static inline int is_equal(struct color c1, struct color c2)
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{
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return c1.red == c2.red && c1.green == c2.green && c1.blue == c2.blue;
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}
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static void write_header(void)
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{
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/* open logo file */
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if (outputname) {
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out = fopen(outputname, "w");
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if (!out)
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die("Cannot create file %s: %s\n", outputname, strerror(errno));
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} else {
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out = stdout;
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}
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fputs("/*\n", out);
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fputs(" * DO NOT EDIT THIS FILE!\n", out);
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fputs(" *\n", out);
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fprintf(out, " * It was automatically generated from %s\n", filename);
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fputs(" *\n", out);
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fprintf(out, " * Linux logo %s\n", logoname);
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fputs(" */\n\n", out);
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fputs("#include <linux/linux_logo.h>\n\n", out);
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fprintf(out, "static unsigned char %s_data[] __initdata = {\n",
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logoname);
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}
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static void write_footer(void)
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{
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fputs("\n};\n\n", out);
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fprintf(out, "struct linux_logo %s __initdata = {\n", logoname);
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fprintf(out, " .type\t= %s,\n", logo_types[logo_type]);
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fprintf(out, " .width\t= %d,\n", logo_width);
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fprintf(out, " .height\t= %d,\n", logo_height);
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if (logo_type == LINUX_LOGO_CLUT224) {
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fprintf(out, " .clutsize\t= %d,\n", logo_clutsize);
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fprintf(out, " .clut\t= %s_clut,\n", logoname);
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}
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fprintf(out, " .data\t= %s_data\n", logoname);
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fputs("};\n\n", out);
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/* close logo file */
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if (outputname)
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fclose(out);
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}
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static int write_hex_cnt;
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static void write_hex(unsigned char byte)
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{
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if (write_hex_cnt % 12)
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fprintf(out, ", 0x%02x", byte);
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else if (write_hex_cnt)
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fprintf(out, ",\n\t0x%02x", byte);
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else
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fprintf(out, "\t0x%02x", byte);
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write_hex_cnt++;
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}
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static void write_logo_mono(void)
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{
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unsigned int i, j;
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unsigned char val, bit;
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/* validate image */
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for (i = 0; i < logo_height; i++)
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for (j = 0; j < logo_width; j++)
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if (!is_black(logo_data[i][j]) && !is_white(logo_data[i][j]))
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die("Image must be monochrome\n");
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/* write file header */
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write_header();
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/* write logo data */
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for (i = 0; i < logo_height; i++) {
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for (j = 0; j < logo_width;) {
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for (val = 0, bit = 0x80; bit && j < logo_width; j++, bit >>= 1)
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if (logo_data[i][j].red)
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val |= bit;
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write_hex(val);
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}
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}
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/* write logo structure and file footer */
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write_footer();
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}
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static void write_logo_vga16(void)
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{
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unsigned int i, j, k;
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unsigned char val;
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/* validate image */
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for (i = 0; i < logo_height; i++)
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for (j = 0; j < logo_width; j++) {
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for (k = 0; k < 16; k++)
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if (is_equal(logo_data[i][j], clut_vga16[k]))
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break;
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if (k == 16)
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die("Image must use the 16 console colors only\n"
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"Use ppmquant(1) -map clut_vga16.ppm to reduce the number "
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"of colors\n");
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}
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/* write file header */
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write_header();
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/* write logo data */
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for (i = 0; i < logo_height; i++)
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for (j = 0; j < logo_width; j++) {
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for (k = 0; k < 16; k++)
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if (is_equal(logo_data[i][j], clut_vga16[k]))
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break;
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val = k<<4;
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if (++j < logo_width) {
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for (k = 0; k < 16; k++)
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if (is_equal(logo_data[i][j], clut_vga16[k]))
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break;
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val |= k;
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}
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write_hex(val);
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}
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/* write logo structure and file footer */
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write_footer();
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}
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static void write_logo_clut224(void)
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{
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unsigned int i, j, k;
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/* validate image */
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for (i = 0; i < logo_height; i++)
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for (j = 0; j < logo_width; j++) {
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for (k = 0; k < logo_clutsize; k++)
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if (is_equal(logo_data[i][j], logo_clut[k]))
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break;
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if (k == logo_clutsize) {
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if (logo_clutsize == MAX_LINUX_LOGO_COLORS)
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die("Image has more than %d colors\n"
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"Use ppmquant(1) to reduce the number of colors\n",
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MAX_LINUX_LOGO_COLORS);
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logo_clut[logo_clutsize++] = logo_data[i][j];
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}
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}
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/* write file header */
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write_header();
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/* write logo data */
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for (i = 0; i < logo_height; i++)
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for (j = 0; j < logo_width; j++) {
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for (k = 0; k < logo_clutsize; k++)
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if (is_equal(logo_data[i][j], logo_clut[k]))
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break;
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write_hex(k+32);
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}
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fputs("\n};\n\n", out);
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/* write logo clut */
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fprintf(out, "static unsigned char %s_clut[] __initdata = {\n",
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logoname);
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write_hex_cnt = 0;
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for (i = 0; i < logo_clutsize; i++) {
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write_hex(logo_clut[i].red);
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write_hex(logo_clut[i].green);
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write_hex(logo_clut[i].blue);
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}
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/* write logo structure and file footer */
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write_footer();
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}
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static void write_logo_gray256(void)
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{
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unsigned int i, j;
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/* validate image */
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for (i = 0; i < logo_height; i++)
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for (j = 0; j < logo_width; j++)
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if (!is_gray(logo_data[i][j]))
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die("Image must be grayscale\n");
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/* write file header */
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write_header();
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/* write logo data */
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for (i = 0; i < logo_height; i++)
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for (j = 0; j < logo_width; j++)
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write_hex(logo_data[i][j].red);
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/* write logo structure and file footer */
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write_footer();
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}
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static void die(const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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vfprintf(stderr, fmt, ap);
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va_end(ap);
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exit(1);
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}
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static void usage(void)
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{
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die("\n"
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"Usage: %s [options] <filename>\n"
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"\n"
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"Valid options:\n"
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" -h : display this usage information\n"
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" -n <name> : specify logo name (default: linux_logo)\n"
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" -o <output> : output to file <output> instead of stdout\n"
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" -t <type> : specify logo type, one of\n"
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" mono : monochrome black/white\n"
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" vga16 : 16 colors VGA text palette\n"
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" clut224 : 224 colors (default)\n"
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" gray256 : 256 levels grayscale\n"
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"\n", programname);
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}
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int main(int argc, char *argv[])
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{
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int opt;
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programname = argv[0];
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opterr = 0;
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while (1) {
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opt = getopt(argc, argv, "hn:o:t:");
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if (opt == -1)
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break;
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switch (opt) {
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case 'h':
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usage();
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break;
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case 'n':
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logoname = optarg;
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break;
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case 'o':
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outputname = optarg;
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break;
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case 't':
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if (!strcmp(optarg, "mono"))
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logo_type = LINUX_LOGO_MONO;
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else if (!strcmp(optarg, "vga16"))
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logo_type = LINUX_LOGO_VGA16;
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else if (!strcmp(optarg, "clut224"))
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logo_type = LINUX_LOGO_CLUT224;
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else if (!strcmp(optarg, "gray256"))
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logo_type = LINUX_LOGO_GRAY256;
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else
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usage();
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break;
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default:
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usage();
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break;
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}
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}
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if (optind != argc-1)
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usage();
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filename = argv[optind];
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read_image();
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switch (logo_type) {
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case LINUX_LOGO_MONO:
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write_logo_mono();
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break;
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case LINUX_LOGO_VGA16:
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write_logo_vga16();
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break;
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case LINUX_LOGO_CLUT224:
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write_logo_clut224();
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break;
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case LINUX_LOGO_GRAY256:
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write_logo_gray256();
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break;
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}
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exit(0);
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}
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