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use std::{convert::TryInto, fmt};
#[derive(Clone, Debug)]
pub struct GraphicControl {
pub(crate) packed: u8,
pub(crate) delay_time: u16,
pub(crate) transparency_index: u8,
}
impl GraphicControl {
pub fn new(
disposal_method: DisposalMethod,
user_input_flag: bool,
transparency_flag: bool,
delay_time: u16,
transparency_index: u8,
) -> Self {
let mut ret = Self {
packed: 0,
delay_time,
transparency_index,
};
ret.set_disposal_method(disposal_method);
ret.user_input(user_input_flag);
ret.transparency(transparency_flag);
ret
}
pub fn disposal_method(&self) -> Option<DisposalMethod> {
match self.packed & 0b000_111_00 {
0b000_000_00 => Some(DisposalMethod::NoAction),
0b000_100_00 => Some(DisposalMethod::DoNotDispose),
0b000_010_00 => Some(DisposalMethod::RestoreBackground),
0b000_110_00 => Some(DisposalMethod::RestorePrevious),
_ => None,
}
}
pub fn set_disposal_method(&mut self, method: DisposalMethod) {
match method {
DisposalMethod::NoAction => self.packed &= 0b111_000_1_1,
DisposalMethod::DoNotDispose => self.packed |= 0b000_100_0_0,
DisposalMethod::RestoreBackground => self.packed |= 0b000_010_0_0,
DisposalMethod::RestorePrevious => self.packed |= 0b000_110_0_0,
};
}
pub fn transparency_index(&self) -> u8 {
self.transparency_index
}
pub fn user_input(&mut self, flag: bool) {
if flag {
self.packed |= 0b000_000_1_0;
} else {
self.packed &= 0b111_111_0_1;
}
}
pub fn transparency(&mut self, flag: bool) {
if flag {
self.packed |= 0b000_000_0_1;
} else {
self.packed &= 0b111_111_1_0;
}
}
pub fn delay_time(&self) -> u16 {
self.delay_time
}
pub fn delay_time_mut(&mut self) -> &mut u16 {
&mut self.delay_time
}
pub fn is_transparent(&self) -> bool {
self.packed & 0b000_000_0_1 > 0
}
}
impl From<[u8; 4]> for GraphicControl {
fn from(arr: [u8; 4]) -> Self {
let packed = arr[0];
let delay_time = u16::from_le_bytes(arr[1..3].try_into().unwrap());
let transparency_index = arr[3];
Self {
packed,
delay_time,
transparency_index,
}
}
}
#[derive(Clone, Copy, Debug, PartialEq)]
pub enum DisposalMethod {
NoAction,
DoNotDispose,
RestoreBackground,
RestorePrevious,
}
impl fmt::Display for DisposalMethod {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
let st = match self {
DisposalMethod::NoAction => "Dispose as Normal",
DisposalMethod::DoNotDispose => "No Dispose",
DisposalMethod::RestoreBackground => "Restore to background",
DisposalMethod::RestorePrevious => "Restore previous image",
};
write!(f, "{}", st)
}
}
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