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tools/bmp_logo.c
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d41ce506b Initial Release, ... |
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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 ", 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 ", msg); fclose (fp); exit (EXIT_FAILURE); } void gen_info(bitmap_t *b, uint16_t n_colors) { printf("/* " " * Automatically generated by \"tools/bmp_logo\" " " * " " * DO NOT EDIT " " * " " */ " "#ifndef __BMP_LOGO_H__ " "#define __BMP_LOGO_H__ " "#define BMP_LOGO_WIDTH\t\t%d " "#define BMP_LOGO_HEIGHT\t\t%d " "#define BMP_LOGO_COLORS\t\t%d " "#define BMP_LOGO_OFFSET\t\t%d " "extern unsigned short bmp_logo_palette[]; " "extern unsigned char bmp_logo_bitmap[]; " "#endif /* __BMP_LOGO_H__ */ ", 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, hdr_size; 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, 2); if (fread(&hdr_size, sizeof(uint16_t), 1, fp) != 1) error("Couldn't read bitmap header size", fp); if (hdr_size < 40) error("Invalid bitmap header", fp); skip_bytes(fp, 2); 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, hdr_size - 34); /* * 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("/* " " * Automatically generated by \"tools/bmp_logo\" " " * " " * DO NOT EDIT " " * " " */ " "#ifndef __BMP_LOGO_DATA_H__ " "#define __BMP_LOGO_DATA_H__ "); /* 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[] = { "); 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) ? " " : "" ); } /* seek to offset indicated by file header */ fseek(fp, (long)data_offset, SEEK_SET); /* read the bitmap; leave room for default color map */ printf (" "); printf ("}; "); printf (" "); printf("unsigned char bmp_logo_bitmap[] = { "); 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) ? ' ' : ' ' ); } printf (" " "}; " "#endif /* __BMP_LOGO_DATA_H__ */ " ); out: fclose(fp); return 0; } |