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; 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, 6); 112 if (fread (&b->width, sizeof (uint16_t), 1, fp) != 1) 113 error ("Couldn't read bitmap width", fp); 114 skip_bytes (fp, 2); 115 if (fread (&b->height, sizeof (uint16_t), 1, fp) != 1) 116 error ("Couldn't read bitmap height", fp); 117 skip_bytes (fp, 22); 118 if (fread (&n_colors, sizeof (uint16_t), 1, fp) != 1) 119 error ("Couldn't read bitmap colors", fp); 120 skip_bytes (fp, 6); 121 122 /* 123 * Repair endianess. 124 */ 125 data_offset = le_short(data_offset); 126 b->width = le_short(b->width); 127 b->height = le_short(b->height); 128 n_colors = le_short(n_colors); 129 130 /* assume we are working with an 8-bit file */ 131 if ((n_colors == 0) || (n_colors > 256 - DEFAULT_CMAP_SIZE)) { 132 /* reserve DEFAULT_CMAP_SIZE color map entries for default map */ 133 n_colors = 256 - DEFAULT_CMAP_SIZE; 134 } 135 136 if (mode == MODE_GEN_INFO) { 137 gen_info(b, n_colors); 138 goto out; 139 } 140 141 printf("/*\n" 142 " * Automatically generated by \"tools/bmp_logo\"\n" 143 " *\n" 144 " * DO NOT EDIT\n" 145 " *\n" 146 " */\n\n\n" 147 "#ifndef __BMP_LOGO_DATA_H__\n" 148 "#define __BMP_LOGO_DATA_H__\n\n"); 149 150 /* allocate memory */ 151 if ((b->data = (uint8_t *)malloc(b->width * b->height)) == NULL) 152 error ("Error allocating memory for file", fp); 153 154 /* read and print the palette information */ 155 printf("unsigned short bmp_logo_palette[] = {\n"); 156 157 for (i=0; i<n_colors; ++i) { 158 b->palette[(int)(i*3+2)] = fgetc(fp); 159 b->palette[(int)(i*3+1)] = fgetc(fp); 160 b->palette[(int)(i*3+0)] = fgetc(fp); 161 x=fgetc(fp); 162 163 printf ("%s0x0%X%X%X,%s", 164 ((i%8) == 0) ? "\t" : " ", 165 (b->palette[(int)(i*3+0)] >> 4) & 0x0F, 166 (b->palette[(int)(i*3+1)] >> 4) & 0x0F, 167 (b->palette[(int)(i*3+2)] >> 4) & 0x0F, 168 ((i%8) == 7) ? "\n" : "" 169 ); 170 } 171 172 /* seek to offset indicated by file header */ 173 fseek(fp, (long)data_offset, SEEK_SET); 174 175 /* read the bitmap; leave room for default color map */ 176 printf ("\n"); 177 printf ("};\n"); 178 printf ("\n"); 179 printf("unsigned char bmp_logo_bitmap[] = {\n"); 180 for (i=(b->height-1)*b->width; i>=0; i-=b->width) { 181 for (x = 0; x < b->width; x++) { 182 b->data[(uint16_t) i + x] = (uint8_t) fgetc (fp) \ 183 + DEFAULT_CMAP_SIZE; 184 } 185 } 186 187 for (i=0; i<(b->height*b->width); ++i) { 188 if ((i%8) == 0) 189 putchar ('\t'); 190 printf ("0x%02X,%c", 191 b->data[i], 192 ((i%8) == 7) ? '\n' : ' ' 193 ); 194 } 195 printf ("\n" 196 "};\n\n" 197 "#endif /* __BMP_LOGO_DATA_H__ */\n" 198 ); 199 200 out: 201 fclose(fp); 202 return 0; 203 } 204