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use byteorder::{WriteBytesExt, LE};
use ico::IconDir;
use riff::{ChunkContents, ChunkId, LIST_ID, RIFF_ID};
use std::io::{Seek, Write};
use thiserror::Error;
pub use ico;
#[derive(Error, Debug)]
pub enum Error {
#[error("I/O error or system error")]
Io(#[from] std::io::Error),
}
pub type Result<T> = std::result::Result<T, Error>;
pub struct Ani {
pub header: AniHeader,
pub frames: Vec<IconDir>,
}
pub struct AniHeader {
pub num_frames: u32,
pub num_steps: u32,
pub width: u32,
pub height: u32,
pub frame_rate: u32,
}
impl Ani {
pub fn encode<T: Seek + Write>(&self, mut writer: T) -> Result<u64> {
const fn chunk_id(value: &[u8; 4]) -> ChunkId {
ChunkId { value: *value }
}
let contents = ChunkContents::Children(
RIFF_ID.clone(),
chunk_id(b"ACON"),
vec![
ChunkContents::Data(chunk_id(b"anih"), self.encode_header()?),
ChunkContents::Children(LIST_ID.clone(), chunk_id(b"fram"), {
let mut chunks = Vec::new();
for cur in &self.frames {
let mut data = Vec::new();
cur.write(&mut data)?;
chunks.push(ChunkContents::Data(chunk_id(b"icon"), data));
}
chunks
}),
],
);
contents.write(&mut writer).map_err(From::from)
}
fn encode_header(&self) -> Result<Vec<u8>> {
let mut data = Vec::with_capacity(36);
data.write_u32::<LE>(36)?;
data.write_u32::<LE>(self.header.num_frames)?;
data.write_u32::<LE>(self.header.num_steps)?;
data.write_u32::<LE>(self.header.width)?;
data.write_u32::<LE>(self.header.height)?;
data.write_u32::<LE>(32)?;
data.write_u32::<LE>(1)?;
data.write_u32::<LE>(self.header.frame_rate)?;
data.write_u32::<LE>(0b01)?;
Ok(data)
}
}