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use std::convert::TryInto;
pub struct ScreenDescriptor {
pub width: u16,
pub height: u16,
pub packed: u8,
pub background_color_index: u8,
pub pixel_aspect_ratio: u8,
}
impl ScreenDescriptor {
pub fn new(width: u16, height: u16) -> Self {
Self {
width,
height,
packed: 0,
background_color_index: 0,
pixel_aspect_ratio: 0,
}
}
pub fn set_color_table_present(&mut self, is_present: bool) {
if is_present {
self.packed |= 0b1000_0000;
} else {
self.packed &= 0b0111_1111;
}
}
pub fn set_color_table_size(&mut self, size: u8) {
println!("scts: {}", size);
// GCT size is calulated by raising two to this number plus one,
// so we have to work backwards.
let size = (size as f32).log2().ceil() - 1f32;
self.packed |= size as u8;
}
//TODO: Setter for sort flag in packed field
//TODO: Setter for color resolution in packed field
pub fn color_table_present(&self) -> bool {
self.packed & 0b1000_0000 != 0
}
pub fn color_table_len(&self) -> usize {
crate::packed_to_color_table_length(self.packed & 0b0000_0111)
}
}
impl From<&ScreenDescriptor> for Box<[u8]> {
fn from(lsd: &ScreenDescriptor) -> Self {
let mut vec = vec![];
vec.extend_from_slice(&lsd.width.to_le_bytes());
vec.extend_from_slice(&lsd.height.to_le_bytes());
vec.push(lsd.packed);
vec.push(lsd.background_color_index);
vec.push(lsd.pixel_aspect_ratio);
vec.into_boxed_slice()
}
}
impl From<[u8; 7]> for ScreenDescriptor {
fn from(arr: [u8; 7]) -> Self {
let width = u16::from_le_bytes(arr[0..2].try_into().unwrap());
let height = u16::from_le_bytes(arr[2..4].try_into().unwrap());
let packed = arr[4];
let background_color_index = arr[5];
let pixel_aspect_ratio = arr[6];
Self {
width,
height,
packed,
background_color_index,
pixel_aspect_ratio,
}
}
}
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