From a990de90fe41456a23e58bd087d2f107d321f3a1 Mon Sep 17 00:00:00 2001
From: Valentin Popov <valentin@popov.link>
Date: Fri, 19 Jul 2024 16:37:58 +0400
Subject: Deleted vendor folder

---
 vendor/jpeg-decoder/src/worker/multithreaded.rs | 123 ------------------------
 1 file changed, 123 deletions(-)
 delete mode 100644 vendor/jpeg-decoder/src/worker/multithreaded.rs

(limited to 'vendor/jpeg-decoder/src/worker/multithreaded.rs')

diff --git a/vendor/jpeg-decoder/src/worker/multithreaded.rs b/vendor/jpeg-decoder/src/worker/multithreaded.rs
deleted file mode 100644
index c820702..0000000
--- a/vendor/jpeg-decoder/src/worker/multithreaded.rs
+++ /dev/null
@@ -1,123 +0,0 @@
-//! This module implements per-component parallelism.
-//! It should be possible to implement per-row parallelism as well,
-//! which should also boost performance of grayscale images
-//! and allow scaling to more cores.
-//! However, that would be more complex, so we use this as a starting point.
-
-use super::immediate::ImmediateWorker;
-use super::{RowData, Worker};
-use crate::decoder::MAX_COMPONENTS;
-use crate::error::Result;
-use std::{
-    mem,
-    sync::mpsc::{self, Receiver, Sender},
-};
-
-enum WorkerMsg {
-    Start(RowData),
-    AppendRow(Vec<i16>),
-    GetResult(Sender<Vec<u8>>),
-}
-
-#[derive(Default)]
-pub struct MpscWorker {
-    senders: [Option<Sender<WorkerMsg>>; MAX_COMPONENTS],
-}
-
-impl MpscWorker {
-    fn start_with(
-        &mut self,
-        row_data: RowData,
-        spawn_worker: impl FnOnce(usize) -> Result<Sender<WorkerMsg>>,
-    ) -> Result<()> {
-        // if there is no worker thread for this component yet, start one
-        let component = row_data.index;
-        if let None = self.senders[component] {
-            let sender = spawn_worker(component)?;
-            self.senders[component] = Some(sender);
-        }
-
-        // we do the "take out value and put it back in once we're done" dance here
-        // and in all other message-passing methods because there's not that many rows
-        // and this should be cheaper than spawning MAX_COMPONENTS many threads up front
-        let sender = self.senders[component].as_mut().unwrap();
-        sender
-            .send(WorkerMsg::Start(row_data))
-            .expect("jpeg-decoder worker thread error");
-        Ok(())
-    }
-
-    fn append_row(&mut self, row: (usize, Vec<i16>)) -> Result<()> {
-        let component = row.0;
-        let sender = self.senders[component].as_mut().unwrap();
-        sender
-            .send(WorkerMsg::AppendRow(row.1))
-            .expect("jpeg-decoder worker thread error");
-        Ok(())
-    }
-
-    fn get_result_with(
-        &mut self,
-        index: usize,
-        collect: impl FnOnce(Receiver<Vec<u8>>) -> Vec<u8>,
-    ) -> Result<Vec<u8>> {
-        let (tx, rx) = mpsc::channel();
-        let sender = mem::take(&mut self.senders[index]).unwrap();
-        sender
-            .send(WorkerMsg::GetResult(tx))
-            .expect("jpeg-decoder worker thread error");
-        Ok(collect(rx))
-    }
-}
-
-impl Worker for MpscWorker {
-    fn start(&mut self, row_data: RowData) -> Result<()> {
-        self.start_with(row_data, spawn_worker_thread)
-    }
-    fn append_row(&mut self, row: (usize, Vec<i16>)) -> Result<()> {
-        MpscWorker::append_row(self, row)
-    }
-    fn get_result(&mut self, index: usize) -> Result<Vec<u8>> {
-        self.get_result_with(index, collect_worker_thread)
-    }
-}
-
-fn create_worker() -> (Sender<WorkerMsg>, impl FnOnce() + 'static) {
-    let (tx, rx) = mpsc::channel();
-    let closure = move || {
-        let mut worker = ImmediateWorker::default();
-
-        while let Ok(message) = rx.recv() {
-            match message {
-                WorkerMsg::Start(mut data) => {
-                    // we always set component index to 0 for worker threads
-                    // because they only ever handle one per thread and we don't want them
-                    // to attempt to access nonexistent components
-                    data.index = 0;
-                    worker.start_immediate(data);
-                }
-                WorkerMsg::AppendRow(row) => {
-                    worker.append_row_immediate((0, row));
-                }
-                WorkerMsg::GetResult(chan) => {
-                    let _ = chan.send(worker.get_result_immediate(0));
-                    break;
-                }
-            }
-        }
-    };
-
-    (tx, closure)
-}
-
-fn spawn_worker_thread(component: usize) -> Result<Sender<WorkerMsg>> {
-    let (tx, worker) = create_worker();
-    let thread_builder =
-        std::thread::Builder::new().name(format!("worker thread for component {}", component));
-    thread_builder.spawn(worker)?;
-    Ok(tx)
-}
-
-fn collect_worker_thread(rx: Receiver<Vec<u8>>) -> Vec<u8> {
-    rx.recv().expect("jpeg-decoder worker thread error")
-}
-- 
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