ben-blinkenlights/ubb-vga/grabfb.c

/*
 * grabfb.c - Grab the Ben's main frame buffer
 *
 * Written 2011 by Werner Almesberger
 * Copyright 2011 Werner Almesberger
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */


#include <stdint.h>
#include <assert.h>

#include "ubb-vga.h"


void grabfb(void **f, int xres, int yres)
{
	uint32_t *fb = map(0x01d00000, 4*320*240);
	uint8_t *p, *q;
	int x, y;
	uint32_t pix;
	uint8_t r, g, b;

	assert(xres == 640);
	assert(yres == 480);
	for (y = 0; y != 240; y++) {
		p = f[y*2];
		q = f[y*2+1];
		for (x = 0; x != 320; x++) {
			pix = *fb++;
			r = pix >> 16;
			g = pix >> 8;
			b = pix;
			*p = *q = ccube_map(r, g, b)*0x11;
			p++;
			q++;
		}
	}
}