1 #include "compiler.h" 2 3 enum { 4 MODE_GEN_INFO, 5 MODE_GEN_DATA 6 }; 7 8 typedef struct bitmap_s { /* bitmap description */ 9 uint16_t width; 10 uint16_t height; 11 uint8_t palette[256*3]; 12 uint8_t *data; 13 } bitmap_t; 14 15 #define DEFAULT_CMAP_SIZE 16 /* size of default color map */ 16 17 void usage(const char *prog) 18 { 19 fprintf(stderr, "Usage: %s [--gen-info|--gen-data] file\n", prog); 20 } 21 22 /* 23 * Neutralize little endians. 24 */ 25 uint16_t le_short(uint16_t x) 26 { 27 uint16_t val; 28 uint8_t *p = (uint8_t *)(&x); 29 30 val = (*p++ & 0xff) << 0; 31 val |= (*p & 0xff) << 8; 32 33 return val; 34 } 35 36 void skip_bytes (FILE *fp, int n) 37 { 38 while (n-- > 0) 39 fgetc (fp); 40 } 41 42 __attribute__ ((__noreturn__)) 43 int error (char * msg, FILE *fp) 44 { 45 fprintf (stderr, "ERROR: %s\n", msg); 46 47 fclose (fp); 48 49 exit (EXIT_FAILURE); 50 } 51 52 void gen_info(bitmap_t *b, uint16_t n_colors) 53 { 54 printf("/*\n" 55 " * Automatically generated by \"tools/bmp_logo\"\n" 56 " *\n" 57 " * DO NOT EDIT\n" 58 " *\n" 59 " */\n\n\n" 60 "#ifndef __BMP_LOGO_H__\n" 61 "#define __BMP_LOGO_H__\n\n" 62 "#define BMP_LOGO_WIDTH\t\t%d\n" 63 "#define BMP_LOGO_HEIGHT\t\t%d\n" 64 "#define BMP_LOGO_COLORS\t\t%d\n" 65 "#define BMP_LOGO_OFFSET\t\t%d\n\n" 66 "extern unsigned short bmp_logo_palette[];\n" 67 "extern unsigned char bmp_logo_bitmap[];\n\n" 68 "#endif /* __BMP_LOGO_H__ */\n", 69 b->width, b->height, n_colors, 70 DEFAULT_CMAP_SIZE); 71 } 72 73 int main (int argc, char *argv[]) 74 { 75 int mode, i, x; 76 FILE *fp; 77 bitmap_t bmp; 78 bitmap_t *b = &bmp; 79 uint16_t data_offset, n_colors, hdr_size; 80 81 if (argc < 3) { 82 usage(argv[0]); 83 exit (EXIT_FAILURE); 84 } 85 86 if (!strcmp(argv[1], "--gen-info")) 87 mode = MODE_GEN_INFO; 88 else if (!strcmp(argv[1], "--gen-data")) 89 mode = MODE_GEN_DATA; 90 else { 91 usage(argv[0]); 92 exit(EXIT_FAILURE); 93 } 94 95 fp = fopen(argv[2], "rb"); 96 if (!fp) { 97 perror(argv[2]); 98 exit (EXIT_FAILURE); 99 } 100 101 if (fgetc (fp) != 'B' || fgetc (fp) != 'M') 102 error ("Input file is not a bitmap", fp); 103 104 /* 105 * read width and height of the image, and the number of colors used; 106 * ignore the rest 107 */ 108 skip_bytes (fp, 8); 109 if (fread (&data_offset, sizeof (uint16_t), 1, fp) != 1) 110 error ("Couldn't read bitmap data offset", fp); 111 skip_bytes(fp, 2); 112 if (fread(&hdr_size, sizeof(uint16_t), 1, fp) != 1) 113 error("Couldn't read bitmap header size", fp); 114 if (hdr_size < 40) 115 error("Invalid bitmap header", fp); 116 skip_bytes(fp, 2); 117 if (fread (&b->width, sizeof (uint16_t), 1, fp) != 1) 118 error ("Couldn't read bitmap width", fp); 119 skip_bytes (fp, 2); 120 if (fread (&b->height, sizeof (uint16_t), 1, fp) != 1) 121 error ("Couldn't read bitmap height", fp); 122 skip_bytes (fp, 22); 123 if (fread (&n_colors, sizeof (uint16_t), 1, fp) != 1) 124 error ("Couldn't read bitmap colors", fp); 125 skip_bytes(fp, hdr_size - 34); 126 127 /* 128 * Repair endianess. 129 */ 130 data_offset = le_short(data_offset); 131 b->width = le_short(b->width); 132 b->height = le_short(b->height); 133 n_colors = le_short(n_colors); 134 135 /* assume we are working with an 8-bit file */ 136 if ((n_colors == 0) || (n_colors > 256 - DEFAULT_CMAP_SIZE)) { 137 /* reserve DEFAULT_CMAP_SIZE color map entries for default map */ 138 n_colors = 256 - DEFAULT_CMAP_SIZE; 139 } 140 141 if (mode == MODE_GEN_INFO) { 142 gen_info(b, n_colors); 143 goto out; 144 } 145 146 printf("/*\n" 147 " * Automatically generated by \"tools/bmp_logo\"\n" 148 " *\n" 149 " * DO NOT EDIT\n" 150 " *\n" 151 " */\n\n\n" 152 "#ifndef __BMP_LOGO_DATA_H__\n" 153 "#define __BMP_LOGO_DATA_H__\n\n"); 154 155 /* allocate memory */ 156 if ((b->data = (uint8_t *)malloc(b->width * b->height)) == NULL) 157 error ("Error allocating memory for file", fp); 158 159 /* read and print the palette information */ 160 printf("unsigned short bmp_logo_palette[] = {\n"); 161 162 for (i=0; i<n_colors; ++i) { 163 b->palette[(int)(i*3+2)] = fgetc(fp); 164 b->palette[(int)(i*3+1)] = fgetc(fp); 165 b->palette[(int)(i*3+0)] = fgetc(fp); 166 x=fgetc(fp); 167 168 printf ("%s0x0%X%X%X,%s", 169 ((i%8) == 0) ? "\t" : " ", 170 (b->palette[(int)(i*3+0)] >> 4) & 0x0F, 171 (b->palette[(int)(i*3+1)] >> 4) & 0x0F, 172 (b->palette[(int)(i*3+2)] >> 4) & 0x0F, 173 ((i%8) == 7) ? "\n" : "" 174 ); 175 } 176 177 /* seek to offset indicated by file header */ 178 fseek(fp, (long)data_offset, SEEK_SET); 179 180 /* read the bitmap; leave room for default color map */ 181 printf ("\n"); 182 printf ("};\n"); 183 printf ("\n"); 184 printf("unsigned char bmp_logo_bitmap[] = {\n"); 185 for (i=(b->height-1)*b->width; i>=0; i-=b->width) { 186 for (x = 0; x < b->width; x++) { 187 b->data[i + x] = (uint8_t) fgetc(fp) 188 + DEFAULT_CMAP_SIZE; 189 } 190 } 191 192 for (i=0; i<(b->height*b->width); ++i) { 193 if ((i%8) == 0) 194 putchar ('\t'); 195 printf ("0x%02X,%c", 196 b->data[i], 197 ((i%8) == 7) ? '\n' : ' ' 198 ); 199 } 200 printf ("\n" 201 "};\n\n" 202 "#endif /* __BMP_LOGO_DATA_H__ */\n" 203 ); 204 205 out: 206 fclose(fp); 207 return 0; 208 } 209