Function spectrusty_core::video::color_line_offset

pub fn color_line_offset<T>(y: T) -> Twhere
    T: Copy + From<u16> + Shr<u16, Output = T> + Shl<u16, Output = T>,

Returns an offset into attributes memory of the given vertical coordinate y [0, 192) (0 on top).

Examples found in repository

src/video.rs (line 250)

    fn floating_bus_screen_address(VideoTs { vc, hc }: VideoTs) -> Option<u16> {
        let line = vc - Self::VSL_PIXELS.start;
        if line >= 0 && vc < Self::VSL_PIXELS.end {
            Self::floating_bus_offset(hc).map(|offs| {
                let y = line as u16;
                let col = (offs >> 3) << 1;
                // println!("got offs: {} col:{} y:{}", offs, col, y);
                match offs & 3 {
                    0 =>          pixel_line_offset(y) + col,
                    1 => 0x1800 + color_line_offset(y) + col,
                    2 => 0x0001 + pixel_line_offset(y) + col,
                    3 => 0x1801 + color_line_offset(y) + col,
                    _ => unsafe { core::hint::unreachable_unchecked() }
                }
            })
        }
        else {
            None
        }
    }