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