uboot-mt623x/tools/bmp_logo.c

#include "compiler.h"

union data_types {
	uint8_t	*data8;
	uint16_t *data16;
};

typedef struct bitmap_s {		/* bitmap description */
	uint16_t		width;
	uint16_t		height;
	uint8_t			palette[256 * 3];
	union data_types	data;
} bitmap_t;

#define DEFAULT_CMAP_SIZE	16	/* size of default color map	*/

/*
 * 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);
}

__attribute__ ((__noreturn__))
int error (char * msg, FILE *fp)
{
	fprintf (stderr, "ERROR: %s\n", msg);

	fclose (fp);

	exit (EXIT_FAILURE);
}

int main (int argc, char *argv[])
{
	int	i, x, padding;
	FILE	*fp;
	bitmap_t bmp;
	bitmap_t *b = &bmp;
	uint16_t data_offset, n_colors;
	int	rgb565_mode = 0;

	if (argc < 2) {
		fprintf(stderr, "Usage: %s file [-rgb565]\n", argv[0]);
		exit(EXIT_FAILURE);
	}

	if (argc > 2) {
		if (!strcmp("-rgb565", argv[2])) {
			rgb565_mode = 1;
			fprintf(stderr, "RGB565 mode chosen.\n");
		}
	}

	fp = fopen(argv[1], "rb");

	if (fp == NULL) {
		perror(argv[1]);
		exit (EXIT_FAILURE);
	}

	if (fgetc(fp) != 'B' || fgetc(fp) != 'M')
		error("Input file is not a bitmap", fp);

	/*
	 * read width and height of the image, and the number of colors used;
	 * ignore the rest
	 */
	skip_bytes(fp, 8);
	if (fread(&data_offset, sizeof(uint16_t), 1, fp) != 1)
		error("Couldn't read bitmap data offset", fp);
	skip_bytes(fp, 6);
	if (fread(&b->width,   sizeof(uint16_t), 1, fp) != 1)
		error("Couldn't read bitmap width", fp);
	skip_bytes(fp, 2);
	if (fread(&b->height,  sizeof(uint16_t), 1, fp) != 1)
		error("Couldn't read bitmap height", fp);
	skip_bytes(fp, 22);
	if (fread(&n_colors, sizeof(uint16_t), 1, fp) != 1)
		error("Couldn't read bitmap colors", fp);
	skip_bytes(fp, 6);

	/*
	 * Repair endianess.
	 */
	data_offset = le_short(data_offset);
	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 ((!rgb565_mode) && ((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;
	}

	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",
		b->width, b->height, n_colors,
		DEFAULT_CMAP_SIZE);

	if (rgb565_mode)
		goto rgb565_start;

	/* allocate memory */
	b->data.data8 = (uint8_t *)malloc(b->width * b->height);

	if (b->data.data8 == NULL)
		error ("Error allocating memory for file", fp);

	/* read and print the palette information */
	printf("unsigned short bmp_logo_palette[] = {\n");

	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);

		printf("%s0x0%X%X%X,%s",
			((i % 8) == 0) ? "\t" : "  ",
			(b->palette[(int)(i * 3 + 0)] >> 4) & 0x0F,
			(b->palette[(int)(i * 3 + 1)] >> 4) & 0x0F,
			(b->palette[(int)(i * 3 + 2)] >> 4) & 0x0F,
			((i % 8) == 7) ? "\n" : ""
		);
	}

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

	/* read the bitmap; leave room for default color map */
	printf("\n");
	printf("};\n");
	printf("\n");
	printf("unsigned char bmp_logo_bitmap[] = {\n");
	/* check if there will be any padding bytes in bitmap */
	padding = (b->width % 4) ? (4 - (b->width % 4)) : 0;

	for (i = (b->height - 1) * b->width; i >= 0; i -= b->width) {
		for (x = 0; x < b->width; x++) {
			b->data.data8[i + x] = (uint8_t)fgetc(fp) +
				DEFAULT_CMAP_SIZE;
		}
		for (x = 0; x < padding; ++x)
			/* read padding bytes if any */
			fgetc(fp);
	}
	fclose(fp);

	for (i = 0; i < (b->height * b->width); ++i) {
		if ((i % 8) == 0)
			putchar ('\t');
		printf("0x%02X,%c",
			b->data.data8[i],
			((i % 8) == 7) ? '\n' : ' ');
	}
	printf("\n"
		"};\n\n"
		"#endif /* __BMP_LOGO_H__ */\n"
	);

	return 0;

rgb565_start:

	/* Allocate memory */
	b->data.data16 =
		(uint16_t *)malloc(b->width * b->height * sizeof(uint16_t));

	if (NULL == b->data.data16)
		error("Error allocating memory for file", fp);

	/* read and print the palette information */
	printf("unsigned short bmp_logo_palette[1] = { 0x00 };\n");

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

	printf("\n");
	printf("unsigned short bmp_logo_bitmap[] = {\n");

	for (i = (b->height - 1) * b->width ; i >= 0; i -= b->width) {
		for (x = 0; x < b->width; x++) {
			b->data.data16[(uint16_t) i + x] =
				(uint16_t)(fgetc(fp) | (fgetc(fp) << 8));
		}
	}

	fclose(fp);

	for (i = 0; i < (b->height * b->width); i++) {

		if ((i % 8) == 0)
			putchar ('\t');

		printf("0x%04X,%c", b->data.data16[i],
			((i % 8) == 7) ? '\n' : ' ');
	}
	printf("\n"
		"};\n\n"
		"#endif /* __BMP_LOGO_H__ */\n"
	);

	return (0);
}