Root/ubb-vga/grabfb.c

1/*
2 * grabfb.c - Grab the Ben's main frame buffer
3 *
4 * Written 2011 by Werner Almesberger
5 * Copyright 2011 Werner Almesberger
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 */
12
13
14#include <stdint.h>
15#include <assert.h>
16
17#include "ubb-vga.h"
18
19
20void grabfb(void **f, int xres, int yres)
21{
22    uint32_t *fb = map(0x01d00000, 4*320*240);
23    uint8_t *p, *q;
24    int x, y;
25    uint32_t pix;
26    uint8_t r, g, b;
27
28    assert(xres == 640);
29    assert(yres == 480);
30    for (y = 0; y != 240; y++) {
31        p = f[y*2];
32        q = f[y*2+1];
33        for (x = 0; x != 320; x++) {
34            pix = *fb++;
35            r = pix >> 16;
36            g = pix >> 8;
37            b = pix;
38            *p = *q = ccube_map(r, g, b)*0x11;
39            p++;
40            q++;
41        }
42    }
43}
44

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