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use Cursor; use CursorBlink; use Display; pub struct DisplayMode { pub cursor_visibility: Cursor, pub cursor_blink: CursorBlink, pub display: Display, } impl Default for DisplayMode { fn default() -> DisplayMode { DisplayMode { cursor_visibility: Cursor::Visible, cursor_blink: CursorBlink::On, display: Display::On, } } } impl DisplayMode { pub fn as_byte(&self) -> u8 { let cursor_blink_bits = match self.cursor_blink { CursorBlink::On => 0b0000_0001, CursorBlink::Off => 0, }; let cursor_visible_bits = match self.cursor_visibility { Cursor::Visible => 0b0000_0010, Cursor::Invisible => 0, }; let display_bits = match self.display { Display::On => 0b0000_0100, Display::Off => 0, }; 0b0000_1000 | cursor_visible_bits | cursor_blink_bits | display_bits } } #[cfg(test)] mod tests { use super::*; #[test] fn cursor_visible() { let dm = DisplayMode { cursor_visibility: Cursor::Visible, ..Default::default() }; assert!(dm.as_byte() & 0b0000_0010 != 0); let dm = DisplayMode { cursor_visibility: Cursor::Invisible, ..Default::default() }; assert!(dm.as_byte() & 0b0000_0010 == 0); } #[test] fn cursor_blink() { let dm = DisplayMode { cursor_blink: CursorBlink::On, ..Default::default() }; assert!(dm.as_byte() & 0b0000_0001 != 0); let dm = DisplayMode { cursor_blink: CursorBlink::Off, ..Default::default() }; assert!(dm.as_byte() & 0b0000_0001 == 0); } #[test] fn display_visible() { let dm = DisplayMode { display: Display::On, ..Default::default() }; assert!(dm.as_byte() & 0b0000_0100 != 0); let dm = DisplayMode { display: Display::Off, ..Default::default() }; assert!(dm.as_byte() & 0b0000_0100 == 0); } }