Initial revision

tools/bmp_logo.c

@@ -0,0 +1,177 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#if defined(__linux__)
+#include <stdint.h>
+#else
+#ifdef __CYGWIN__
+#include "elf.h"
+#else
+#include <inttypes.h>
+#endif
+#endif
+
+#ifdef __CYGWIN__
+typedef unsigned short ushort;
+#endif /* __CYGWIN__ */
+
+
+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	*/
+
+/*
+ * 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);
+}
+
+int main (int argc, char *argv[])
+{
+	int	i, x;
+	FILE	*fp;
+	bitmap_t bmp;
+	bitmap_t *b = &bmp;
+	uint16_t n_colors;
+
+	if (argc < 2) {
+		fprintf (stderr, "Usage: %s file\n", argv[0]);
+		exit (EXIT_FAILURE);
+	}
+
+	if ((fp = fopen (argv[1], "rb")) == NULL) {
+		perror (argv[1]);
+		exit (EXIT_FAILURE);
+	}
+
+	if (fgetc (fp) != 'B' || fgetc (fp) != 'M') {
+		fprintf (stderr, "%s is not a bitmap file.\n", argv[1]);
+		exit (EXIT_FAILURE);
+	}
+
+        /*
+         * read width and height of the image, and the number of colors used;
+	 * ignore the rest
+	 */
+	skip_bytes (fp, 16);
+	fread (&b->width,   sizeof (uint16_t), 1, fp);
+	skip_bytes (fp, 2);
+	fread (&b->height,  sizeof (uint16_t), 1, fp);
+	skip_bytes (fp, 22);
+	fread (&n_colors, sizeof (uint16_t), 1, fp);
+	skip_bytes (fp, 6);
+
+	/*
+	 * Repair endianess.
+	 */
+	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;
+	}
+
+	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);
+
+	/* allocate memory */
+	if ((b->data = (uint8_t *)malloc(b->width * b->height)) == NULL) {
+		fclose (fp);
+		printf ("Error allocating memory for file %s.\n", argv[1]);
+		exit (EXIT_FAILURE);
+	}
+
+	/* 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);
+
+#if 0
+		if ((i%4) == 0)
+			putchar ('\t');
+		printf ("0x%02X, 0x%02X, 0x%02X,%s",
+			b->palette[(int)(i*3+0)],
+			b->palette[(int)(i*3+1)],
+			b->palette[(int)(i*3+2)],
+			((i%4) == 3) ? "\n" : "	   "
+		);
+#else
+		if ((i%8) == 0)
+			putchar ('\t');
+		printf ("0x0%X%X%X,%s",
+			(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" : "  "
+		);
+#endif
+	}
+
+	/* read the bitmap; leave room for default color map */
+	printf ("\n");
+	printf ("};\n");
+	printf ("\n");
+	printf ("unsigned char 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[(uint16_t) i + x] = (uint8_t) fgetc (fp) \
+						+ DEFAULT_CMAP_SIZE;
+		}
+	}
+	fclose (fp);
+
+	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"
+		"#endif /* __BMP_LOGO_H__ */\n"
+	);
+
+	return (0);
+}
+