| <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/jpeg-decoder-0.1.22/src/worker/immediate.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>immediate.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../../normalize.css"><link rel="stylesheet" href="../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../../ayu.css" disabled><link rel="stylesheet" href="../../../dark.css" disabled><link rel="stylesheet" href="../../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../../storage.js"></script><script defer src="../../../source-script.js"></script><script defer src="../../../source-files.js"></script><script defer src="../../../main.js"></script><noscript><link rel="stylesheet" href="../../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../../jpeg_decoder/index.html"><div class="logo-container"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../../jpeg_decoder/index.html"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
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| </pre><pre class="rust"><code><span class="kw">use </span>decoder::MAX_COMPONENTS; |
| <span class="kw">use </span>error::Result; |
| <span class="kw">use </span>idct::dequantize_and_idct_block; |
| <span class="kw">use </span>std::mem; |
| <span class="kw">use </span>std::sync::Arc; |
| <span class="kw">use </span>parser::Component; |
| <span class="kw">use super</span>::{RowData, Worker}; |
| |
| <span class="kw">pub struct </span>ImmediateWorker { |
| offsets: [usize; MAX_COMPONENTS], |
| results: Vec<Vec<u8>>, |
| components: Vec<<span class="prelude-ty">Option</span><Component>>, |
| quantization_tables: Vec<<span class="prelude-ty">Option</span><Arc<[u16; <span class="number">64</span>]>>>, |
| } |
| |
| <span class="kw">impl </span>ImmediateWorker { |
| <span class="kw">pub fn </span>new_immediate() -> ImmediateWorker { |
| ImmediateWorker { |
| offsets: [<span class="number">0</span>; MAX_COMPONENTS], |
| results: <span class="macro">vec!</span>[Vec::new(); MAX_COMPONENTS], |
| components: <span class="macro">vec!</span>[<span class="prelude-val">None</span>; MAX_COMPONENTS], |
| quantization_tables: <span class="macro">vec!</span>[<span class="prelude-val">None</span>; MAX_COMPONENTS], |
| } |
| } |
| <span class="kw">pub fn </span>start_immediate(<span class="kw-2">&mut </span><span class="self">self</span>, data: RowData) { |
| <span class="macro">assert!</span>(<span class="self">self</span>.results[data.index].is_empty()); |
| |
| <span class="self">self</span>.offsets[data.index] = <span class="number">0</span>; |
| <span class="self">self</span>.results[data.index].resize(data.component.block_size.width <span class="kw">as </span>usize * data.component.block_size.height <span class="kw">as </span>usize * data.component.dct_scale * data.component.dct_scale, <span class="number">0u8</span>); |
| <span class="self">self</span>.components[data.index] = <span class="prelude-val">Some</span>(data.component); |
| <span class="self">self</span>.quantization_tables[data.index] = <span class="prelude-val">Some</span>(data.quantization_table); |
| } |
| <span class="kw">pub fn </span>append_row_immediate(<span class="kw-2">&mut </span><span class="self">self</span>, (index, data): (usize, Vec<i16>)) { |
| <span class="comment">// Convert coefficients from a MCU row to samples. |
| |
| </span><span class="kw">let </span>component = <span class="self">self</span>.components[index].as_ref().unwrap(); |
| <span class="kw">let </span>quantization_table = <span class="self">self</span>.quantization_tables[index].as_ref().unwrap(); |
| <span class="kw">let </span>block_count = component.block_size.width <span class="kw">as </span>usize * component.vertical_sampling_factor <span class="kw">as </span>usize; |
| <span class="kw">let </span>line_stride = component.block_size.width <span class="kw">as </span>usize * component.dct_scale; |
| |
| <span class="macro">assert_eq!</span>(data.len(), block_count * <span class="number">64</span>); |
| |
| <span class="kw">for </span>i <span class="kw">in </span><span class="number">0</span>..block_count { |
| <span class="kw">let </span>x = (i % component.block_size.width <span class="kw">as </span>usize) * component.dct_scale; |
| <span class="kw">let </span>y = (i / component.block_size.width <span class="kw">as </span>usize) * component.dct_scale; |
| |
| <span class="kw">let </span>coefficients = <span class="kw-2">&</span>data[i * <span class="number">64</span>..(i + <span class="number">1</span>) * <span class="number">64</span>]; |
| <span class="kw">let </span>output = <span class="kw-2">&mut </span><span class="self">self</span>.results[index][<span class="self">self</span>.offsets[index] + y * line_stride + x..]; |
| |
| dequantize_and_idct_block(component.dct_scale, coefficients, quantization_table, line_stride, output); |
| } |
| |
| <span class="self">self</span>.offsets[index] += block_count * component.dct_scale * component.dct_scale; |
| } |
| <span class="kw">pub fn </span>get_result_immediate(<span class="kw-2">&mut </span><span class="self">self</span>, index: usize) -> Vec<u8> { |
| mem::replace(<span class="kw-2">&mut </span><span class="self">self</span>.results[index], Vec::new()) |
| } |
| } |
| |
| <span class="kw">impl </span>Worker <span class="kw">for </span>ImmediateWorker { |
| <span class="kw">fn </span>new() -> <span class="prelude-ty">Result</span><<span class="self">Self</span>> { |
| <span class="prelude-val">Ok</span>(ImmediateWorker::new_immediate()) |
| } |
| <span class="kw">fn </span>start(<span class="kw-2">&mut </span><span class="self">self</span>, data: RowData) -> <span class="prelude-ty">Result</span><()> { |
| <span class="self">self</span>.start_immediate(data); |
| <span class="prelude-val">Ok</span>(()) |
| } |
| <span class="kw">fn </span>append_row(<span class="kw-2">&mut </span><span class="self">self</span>, row: (usize, Vec<i16>)) -> <span class="prelude-ty">Result</span><()> { |
| <span class="self">self</span>.append_row_immediate(row); |
| <span class="prelude-val">Ok</span>(()) |
| } |
| <span class="kw">fn </span>get_result(<span class="kw-2">&mut </span><span class="self">self</span>, index: usize) -> <span class="prelude-ty">Result</span><Vec<u8>> { |
| <span class="prelude-val">Ok</span>(<span class="self">self</span>.get_result_immediate(index)) |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="jpeg_decoder" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
