166 lines
3.5 KiB
C
166 lines
3.5 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#if defined(__linux__)
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#include <stdint.h>
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#else
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#ifdef __CYGWIN__
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#include "elf.h"
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#else
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#include <inttypes.h>
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#endif
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#endif
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typedef struct bitmap_s { /* bitmap description */
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uint16_t width;
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uint16_t height;
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uint8_t palette[256*3];
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uint8_t *data;
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} bitmap_t;
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#define DEFAULT_CMAP_SIZE 16 /* size of default color map */
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/*
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* Neutralize little endians.
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*/
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uint16_t le_short(uint16_t x)
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{
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uint16_t val;
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uint8_t *p = (uint8_t *)(&x);
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val = (*p++ & 0xff) << 0;
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val |= (*p & 0xff) << 8;
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return val;
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}
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void skip_bytes (FILE *fp, int n)
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{
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while (n-- > 0)
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fgetc (fp);
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}
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int main (int argc, char *argv[])
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{
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int i, x;
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FILE *fp;
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bitmap_t bmp;
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bitmap_t *b = &bmp;
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uint16_t data_offset, n_colors;
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if (argc < 2) {
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fprintf (stderr, "Usage: %s file\n", argv[0]);
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exit (EXIT_FAILURE);
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}
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if ((fp = fopen (argv[1], "rb")) == NULL) {
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perror (argv[1]);
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exit (EXIT_FAILURE);
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}
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if (fgetc (fp) != 'B' || fgetc (fp) != 'M') {
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fprintf (stderr, "%s is not a bitmap file.\n", argv[1]);
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exit (EXIT_FAILURE);
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}
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/*
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* read width and height of the image, and the number of colors used;
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* ignore the rest
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*/
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skip_bytes (fp, 8);
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fread (&data_offset, sizeof (uint16_t), 1, fp);
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skip_bytes (fp, 6);
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fread (&b->width, sizeof (uint16_t), 1, fp);
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skip_bytes (fp, 2);
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fread (&b->height, sizeof (uint16_t), 1, fp);
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skip_bytes (fp, 22);
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fread (&n_colors, sizeof (uint16_t), 1, fp);
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skip_bytes (fp, 6);
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/*
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* Repair endianess.
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*/
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data_offset = le_short(data_offset);
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b->width = le_short(b->width);
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b->height = le_short(b->height);
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n_colors = le_short(n_colors);
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/* assume we are working with an 8-bit file */
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if ((n_colors == 0) || (n_colors > 256 - DEFAULT_CMAP_SIZE)) {
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/* reserve DEFAULT_CMAP_SIZE color map entries for default map */
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n_colors = 256 - DEFAULT_CMAP_SIZE;
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}
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printf ("/*\n"
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" * Automatically generated by \"tools/bmp_logo\"\n"
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" *\n"
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" * DO NOT EDIT\n"
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" *\n"
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" */\n\n\n"
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"#ifndef __BMP_LOGO_H__\n"
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"#define __BMP_LOGO_H__\n\n"
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"#define BMP_LOGO_WIDTH\t\t%d\n"
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"#define BMP_LOGO_HEIGHT\t\t%d\n"
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"#define BMP_LOGO_COLORS\t\t%d\n"
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"#define BMP_LOGO_OFFSET\t\t%d\n"
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"\n",
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b->width, b->height, n_colors,
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DEFAULT_CMAP_SIZE);
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/* allocate memory */
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if ((b->data = (uint8_t *)malloc(b->width * b->height)) == NULL) {
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fclose (fp);
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printf ("Error allocating memory for file %s.\n", argv[1]);
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exit (EXIT_FAILURE);
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}
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/* read and print the palette information */
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printf ("unsigned short bmp_logo_palette[] = {\n");
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for (i=0; i<n_colors; ++i) {
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b->palette[(int)(i*3+2)] = fgetc(fp);
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b->palette[(int)(i*3+1)] = fgetc(fp);
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b->palette[(int)(i*3+0)] = fgetc(fp);
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x=fgetc(fp);
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printf ("%s0x0%X%X%X,%s",
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((i%8) == 0) ? "\t" : " ",
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(b->palette[(int)(i*3+0)] >> 4) & 0x0F,
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(b->palette[(int)(i*3+1)] >> 4) & 0x0F,
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(b->palette[(int)(i*3+2)] >> 4) & 0x0F,
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((i%8) == 7) ? "\n" : ""
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);
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}
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/* seek to offset indicated by file header */
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fseek(fp, (long)data_offset, SEEK_SET);
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/* read the bitmap; leave room for default color map */
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printf ("\n");
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printf ("};\n");
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printf ("\n");
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printf ("unsigned char bmp_logo_bitmap[] = {\n");
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for (i=(b->height-1)*b->width; i>=0; i-=b->width) {
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for (x = 0; x < b->width; x++) {
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b->data[(uint16_t) i + x] = (uint8_t) fgetc (fp) \
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+ DEFAULT_CMAP_SIZE;
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}
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}
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fclose (fp);
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for (i=0; i<(b->height*b->width); ++i) {
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if ((i%8) == 0)
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putchar ('\t');
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printf ("0x%02X,%c",
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b->data[i],
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((i%8) == 7) ? '\n' : ' '
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);
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}
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printf ("\n"
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"};\n\n"
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"#endif /* __BMP_LOGO_H__ */\n"
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);
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return (0);
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}
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