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use crate::tag_type::Tag;
use crate::Reader;
use core::slice;
#[derive(Debug, PartialEq, Eq)]
pub struct FramebufferTag<'a> {
pub address: u64,
pub pitch: u32,
pub width: u32,
pub height: u32,
pub bpp: u8,
pub buffer_type: FramebufferType<'a>,
}
#[derive(Debug, PartialEq, Eq)]
pub enum FramebufferType<'a> {
Indexed {
#[allow(missing_docs)]
palette: &'a [FramebufferColor],
},
#[allow(missing_docs)]
RGB {
red: FramebufferField,
green: FramebufferField,
blue: FramebufferField,
},
Text,
}
#[derive(Debug, PartialEq, Eq)]
pub struct FramebufferField {
pub position: u8,
pub size: u8,
}
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
#[repr(C, packed)]
pub struct FramebufferColor {
pub red: u8,
pub green: u8,
pub blue: u8,
}
pub fn framebuffer_tag(tag: &Tag) -> FramebufferTag {
let mut reader = Reader::new(tag as *const Tag);
reader.skip(8);
let address = reader.read_u64();
let pitch = reader.read_u32();
let width = reader.read_u32();
let height = reader.read_u32();
let bpp = reader.read_u8();
let type_no = reader.read_u8();
reader.skip(2);
let buffer_type = match type_no {
0 => {
let num_colors = reader.read_u32();
let palette = unsafe {
slice::from_raw_parts(
reader.current_address() as *const FramebufferColor,
num_colors as usize,
)
} as &'static [FramebufferColor];
FramebufferType::Indexed { palette }
}
1 => {
let red_pos = reader.read_u8();
let red_mask = reader.read_u8();
let green_pos = reader.read_u8();
let green_mask = reader.read_u8();
let blue_pos = reader.read_u8();
let blue_mask = reader.read_u8();
FramebufferType::RGB {
red: FramebufferField {
position: red_pos,
size: red_mask,
},
green: FramebufferField {
position: green_pos,
size: green_mask,
},
blue: FramebufferField {
position: blue_pos,
size: blue_mask,
},
}
}
2 => FramebufferType::Text,
_ => panic!("Unknown framebuffer type: {}", type_no),
};
FramebufferTag {
address,
pitch,
width,
height,
bpp,
buffer_type,
}
}