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ben-blinkenlights/ubb-vga/grabfb.c

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/*
* 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++;
}
}
}