bmp_logo.c 4.37 KB
Newer Older
1
#include "compiler.h"
wdenk's avatar
wdenk committed
2

3 4 5 6 7
enum {
	MODE_GEN_INFO,
	MODE_GEN_DATA
};

wdenk's avatar
wdenk committed
8 9 10 11 12 13 14 15 16
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	*/

17 18 19 20 21
void usage(const char *prog)
{
	fprintf(stderr, "Usage: %s [--gen-info|--gen-data] file\n", prog);
}

wdenk's avatar
wdenk committed
22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41
/*
 * 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);
}

42 43 44 45 46 47 48 49 50 51
__attribute__ ((__noreturn__))
int error (char * msg, FILE *fp)
{
	fprintf (stderr, "ERROR: %s\n", msg);

	fclose (fp);

	exit (EXIT_FAILURE);
}

52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72
void gen_info(bitmap_t *b, uint16_t n_colors)
{
	printf("/*\n"
		" * Automatically generated by \"tools/bmp_logo\"\n"
		" *\n"
		" * DO NOT EDIT\n"
		" *\n"
		" */\n\n\n"
		"#ifndef __BMP_LOGO_H__\n"
		"#define __BMP_LOGO_H__\n\n"
		"#define BMP_LOGO_WIDTH\t\t%d\n"
		"#define BMP_LOGO_HEIGHT\t\t%d\n"
		"#define BMP_LOGO_COLORS\t\t%d\n"
		"#define BMP_LOGO_OFFSET\t\t%d\n\n"
		"extern unsigned short bmp_logo_palette[];\n"
		"extern unsigned char bmp_logo_bitmap[];\n\n"
		"#endif /* __BMP_LOGO_H__ */\n",
		b->width, b->height, n_colors,
		DEFAULT_CMAP_SIZE);
}

wdenk's avatar
wdenk committed
73 74
int main (int argc, char *argv[])
{
75
	int	mode, i, x;
wdenk's avatar
wdenk committed
76 77 78
	FILE	*fp;
	bitmap_t bmp;
	bitmap_t *b = &bmp;
79
	uint16_t data_offset, n_colors;
wdenk's avatar
wdenk committed
80

81 82
	if (argc < 3) {
		usage(argv[0]);
wdenk's avatar
wdenk committed
83 84 85
		exit (EXIT_FAILURE);
	}

86 87 88 89 90 91 92 93 94 95 96 97
	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]);
wdenk's avatar
wdenk committed
98 99 100
		exit (EXIT_FAILURE);
	}

101 102
	if (fgetc (fp) != 'B' || fgetc (fp) != 'M')
		error ("Input file is not a bitmap", fp);
wdenk's avatar
wdenk committed
103

wdenk's avatar
wdenk committed
104 105
	/*
	 * read width and height of the image, and the number of colors used;
wdenk's avatar
wdenk committed
106 107
	 * ignore the rest
	 */
108
	skip_bytes (fp, 8);
109 110
	if (fread (&data_offset, sizeof (uint16_t), 1, fp) != 1)
		error ("Couldn't read bitmap data offset", fp);
111
	skip_bytes (fp, 6);
112 113
	if (fread (&b->width,   sizeof (uint16_t), 1, fp) != 1)
		error ("Couldn't read bitmap width", fp);
wdenk's avatar
wdenk committed
114
	skip_bytes (fp, 2);
115 116
	if (fread (&b->height,  sizeof (uint16_t), 1, fp) != 1)
		error ("Couldn't read bitmap height", fp);
wdenk's avatar
wdenk committed
117
	skip_bytes (fp, 22);
118 119
	if (fread (&n_colors, sizeof (uint16_t), 1, fp) != 1)
		error ("Couldn't read bitmap colors", fp);
wdenk's avatar
wdenk committed
120 121 122 123 124
	skip_bytes (fp, 6);

	/*
	 * Repair endianess.
	 */
125
	data_offset = le_short(data_offset);
wdenk's avatar
wdenk committed
126 127 128 129 130 131 132 133 134 135
	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;
	}

136 137 138 139 140 141
	if (mode == MODE_GEN_INFO) {
		gen_info(b, n_colors);
		goto out;
	}

	printf("/*\n"
wdenk's avatar
wdenk committed
142 143 144 145 146
		" * Automatically generated by \"tools/bmp_logo\"\n"
		" *\n"
		" * DO NOT EDIT\n"
		" *\n"
		" */\n\n\n"
147 148
		"#ifndef __BMP_LOGO_DATA_H__\n"
		"#define __BMP_LOGO_DATA_H__\n\n");
wdenk's avatar
wdenk committed
149 150

	/* allocate memory */
151 152
	if ((b->data = (uint8_t *)malloc(b->width * b->height)) == NULL)
		error ("Error allocating memory for file", fp);
wdenk's avatar
wdenk committed
153 154

	/* read and print the palette information */
155
	printf("unsigned short bmp_logo_palette[] = {\n");
wdenk's avatar
wdenk committed
156 157 158 159 160 161 162

	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);

163 164
		printf ("%s0x0%X%X%X,%s",
			((i%8) == 0) ? "\t" : "  ",
wdenk's avatar
wdenk committed
165 166 167
			(b->palette[(int)(i*3+0)] >> 4) & 0x0F,
			(b->palette[(int)(i*3+1)] >> 4) & 0x0F,
			(b->palette[(int)(i*3+2)] >> 4) & 0x0F,
168
			((i%8) == 7) ? "\n" : ""
wdenk's avatar
wdenk committed
169 170 171
		);
	}

172 173 174
	/* seek to offset indicated by file header */
	fseek(fp, (long)data_offset, SEEK_SET);

wdenk's avatar
wdenk committed
175 176 177 178
	/* read the bitmap; leave room for default color map */
	printf ("\n");
	printf ("};\n");
	printf ("\n");
179
	printf("unsigned char bmp_logo_bitmap[] = {\n");
wdenk's avatar
wdenk committed
180 181
	for (i=(b->height-1)*b->width; i>=0; i-=b->width) {
		for (x = 0; x < b->width; x++) {
182
			b->data[i + x] = (uint8_t) fgetc(fp)
wdenk's avatar
wdenk committed
183 184 185 186 187 188 189 190 191 192 193 194 195 196
						+ 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) ? '\n' : ' '
		);
	}
	printf ("\n"
		"};\n\n"
197
		"#endif /* __BMP_LOGO_DATA_H__ */\n"
wdenk's avatar
wdenk committed
198 199
	);

200 201 202
out:
	fclose(fp);
	return 0;
wdenk's avatar
wdenk committed
203
}