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