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
usage(const char * prog)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 */
le_short(uint16_t x)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
skip_bytes(FILE * fp,int n)36 void skip_bytes (FILE *fp, int n)
37 {
38 while (n-- > 0)
39 fgetc (fp);
40 }
41
42 __attribute__ ((__noreturn__))
error(char * msg,FILE * fp)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
gen_info(bitmap_t * b,uint16_t n_colors)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
main(int argc,char * argv[])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