jxl 0.1.0

High performance Rust implementation of a JPEG XL decoder
Documentation 
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// Copyright (c) the JPEG XL Project Authors. All rights reserved.
//
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

use std::{any::Any, sync::Arc};

use crate::{
    features::patches::PatchesDictionary,
    frame::ReferenceFrame,
    headers::extra_channels::ExtraChannelInfo,
    render::{RenderPipelineInPlaceStage, RenderPipelineStage},
    util::NewWithCapacity as _,
};

pub struct PatchesStage {
    pub patches: PatchesDictionary,
    pub extra_channels: Vec<ExtraChannelInfo>,
    pub decoder_state: Arc<Vec<Option<ReferenceFrame>>>,
}

impl std::fmt::Display for PatchesStage {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        write!(f, "patches")
    }
}

impl RenderPipelineStage for PatchesStage {
    type Type = RenderPipelineInPlaceStage<f32>;

    fn uses_channel(&self, c: usize) -> bool {
        c < 3 + self.extra_channels.len()
    }

    fn process_row_chunk(
        &self,
        position: (usize, usize),
        xsize: usize,
        row: &mut [&mut [f32]],
        state: Option<&mut dyn Any>,
    ) {
        let state: &mut Vec<usize> = state.unwrap().downcast_mut().unwrap();
        self.patches.add_one_row(
            row,
            position,
            xsize,
            &self.extra_channels,
            &self.decoder_state,
            state,
        );
    }

    fn init_local_state(&self) -> crate::error::Result<Option<Box<dyn Any>>> {
        let patches_for_row_result = Vec::<usize>::new_with_capacity(self.patches.positions.len())?;
        Ok(Some(Box::new(patches_for_row_result) as Box<dyn Any>))
    }
}

#[cfg(test)]
mod test {
    #[test]
    fn process_row_chunk() {}
}