Re: vfb.c (ruby)

[James S. <jsi...@ac...>]

> Okay ... has anybody tested vfb.c? I didn't. If it works, I don't know how,
> because it computes the memory size with get_line_length() to test:

Okay I found out what this code does. I have placed the code with comments
in CVS. Here is the explanation:

static u_long get_line_length(int xres_virtual, int bpp)
{
    u_long length;

    /* Calculate number of bits per display line */
    length = xres_virtual * bpp;
    /* Round up to a multiple of 32 */
    length = (length+31)&~31;
    /* Convert number of bits to number of bytes */
    length >>= 3;
    return(length);
}