<!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 `/home/sangenya/.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="stylesheet" type="text/css" href="../../../normalize.css"><link rel="stylesheet" type="text/css" href="../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../../light.css" id="themeStyle"><link rel="stylesheet" type="text/css" href="../../../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../../../ayu.css" disabled ><script id="default-settings"></script><script src="../../../storage.js"></script><script src="../../../crates.js"></script><noscript><link rel="stylesheet" href="../../../noscript.css"></noscript><link rel="icon" type="image/svg+xml" href="../../../favicon.svg">
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<span class="kw">use</span> <span class="ident">decoder::MAX_COMPONENTS</span>;
<span class="kw">use</span> <span class="ident">error::Result</span>;
<span class="kw">use</span> <span class="ident">idct::dequantize_and_idct_block</span>;
<span class="kw">use</span> <span class="ident">std::mem</span>;
<span class="kw">use</span> <span class="ident">std::sync::Arc</span>;
<span class="kw">use</span> <span class="ident">parser::Component</span>;
<span class="kw">use</span> <span class="kw">super</span>::{<span class="ident">RowData</span>, <span class="ident">Worker</span>};
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">ImmediateWorker</span> {
<span class="ident">offsets</span>: [<span class="ident">usize</span>; <span class="ident">MAX_COMPONENTS</span>],
<span class="ident">results</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span><span class="op">></span>,
<span class="ident">components</span>: <span class="ident">Vec</span><span class="op"><</span><span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Component</span><span class="op">></span><span class="op">></span>,
<span class="ident">quantization_tables</span>: <span class="ident">Vec</span><span class="op"><</span><span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Arc</span><span class="op"><</span>[<span class="ident">u16</span>; <span class="number">64</span>]<span class="op">></span><span class="op">></span><span class="op">></span>,
}
<span class="kw">impl</span> <span class="ident">ImmediateWorker</span> {
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new_immediate</span>() <span class="op">-</span><span class="op">></span> <span class="ident">ImmediateWorker</span> {
<span class="ident">ImmediateWorker</span> {
<span class="ident">offsets</span>: [<span class="number">0</span>; <span class="ident">MAX_COMPONENTS</span>],
<span class="ident">results</span>: <span class="macro">vec!</span>[<span class="ident">Vec::new</span>(); <span class="ident">MAX_COMPONENTS</span>],
<span class="ident">components</span>: <span class="macro">vec!</span>[<span class="prelude-val">None</span>; <span class="ident">MAX_COMPONENTS</span>],
<span class="ident">quantization_tables</span>: <span class="macro">vec!</span>[<span class="prelude-val">None</span>; <span class="ident">MAX_COMPONENTS</span>],
}
}
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">start_immediate</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">data</span>: <span class="ident">RowData</span>) {
<span class="macro">assert!</span>(<span class="self">self</span>.<span class="ident">results</span>[<span class="ident">data</span>.<span class="ident">index</span>].<span class="ident">is_empty</span>());
<span class="self">self</span>.<span class="ident">offsets</span>[<span class="ident">data</span>.<span class="ident">index</span>] <span class="op">=</span> <span class="number">0</span>;
<span class="self">self</span>.<span class="ident">results</span>[<span class="ident">data</span>.<span class="ident">index</span>].<span class="ident">resize</span>(<span class="ident">data</span>.<span class="ident">component</span>.<span class="ident">block_size</span>.<span class="ident">width</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op">*</span> <span class="ident">data</span>.<span class="ident">component</span>.<span class="ident">block_size</span>.<span class="ident">height</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op">*</span> <span class="ident">data</span>.<span class="ident">component</span>.<span class="ident">dct_scale</span> <span class="op">*</span> <span class="ident">data</span>.<span class="ident">component</span>.<span class="ident">dct_scale</span>, <span class="number">0u8</span>);
<span class="self">self</span>.<span class="ident">components</span>[<span class="ident">data</span>.<span class="ident">index</span>] <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">data</span>.<span class="ident">component</span>);
<span class="self">self</span>.<span class="ident">quantization_tables</span>[<span class="ident">data</span>.<span class="ident">index</span>] <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">data</span>.<span class="ident">quantization_table</span>);
}
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">append_row_immediate</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, (<span class="ident">index</span>, <span class="ident">data</span>): (<span class="ident">usize</span>, <span class="ident">Vec</span><span class="op"><</span><span class="ident">i16</span><span class="op">></span>)) {
<span class="comment">// Convert coefficients from a MCU row to samples.</span>
<span class="kw">let</span> <span class="ident">component</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">components</span>[<span class="ident">index</span>].<span class="ident">as_ref</span>().<span class="ident">unwrap</span>();
<span class="kw">let</span> <span class="ident">quantization_table</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">quantization_tables</span>[<span class="ident">index</span>].<span class="ident">as_ref</span>().<span class="ident">unwrap</span>();
<span class="kw">let</span> <span class="ident">block_count</span> <span class="op">=</span> <span class="ident">component</span>.<span class="ident">block_size</span>.<span class="ident">width</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op">*</span> <span class="ident">component</span>.<span class="ident">vertical_sampling_factor</span> <span class="kw">as</span> <span class="ident">usize</span>;
<span class="kw">let</span> <span class="ident">line_stride</span> <span class="op">=</span> <span class="ident">component</span>.<span class="ident">block_size</span>.<span class="ident">width</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op">*</span> <span class="ident">component</span>.<span class="ident">dct_scale</span>;
<span class="macro">assert_eq!</span>(<span class="ident">data</span>.<span class="ident">len</span>(), <span class="ident">block_count</span> <span class="op">*</span> <span class="number">64</span>);
<span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">block_count</span> {
<span class="kw">let</span> <span class="ident">x</span> <span class="op">=</span> (<span class="ident">i</span> <span class="op">%</span> <span class="ident">component</span>.<span class="ident">block_size</span>.<span class="ident">width</span> <span class="kw">as</span> <span class="ident">usize</span>) <span class="op">*</span> <span class="ident">component</span>.<span class="ident">dct_scale</span>;
<span class="kw">let</span> <span class="ident">y</span> <span class="op">=</span> (<span class="ident">i</span> <span class="op">/</span> <span class="ident">component</span>.<span class="ident">block_size</span>.<span class="ident">width</span> <span class="kw">as</span> <span class="ident">usize</span>) <span class="op">*</span> <span class="ident">component</span>.<span class="ident">dct_scale</span>;
<span class="kw">let</span> <span class="ident">coefficients</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">data</span>[<span class="ident">i</span> <span class="op">*</span> <span class="number">64</span>..(<span class="ident">i</span> <span class="op">+</span> <span class="number">1</span>) <span class="op">*</span> <span class="number">64</span>];
<span class="kw">let</span> <span class="ident">output</span> <span class="op">=</span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">results</span>[<span class="ident">index</span>][<span class="self">self</span>.<span class="ident">offsets</span>[<span class="ident">index</span>] <span class="op">+</span> <span class="ident">y</span> <span class="op">*</span> <span class="ident">line_stride</span> <span class="op">+</span> <span class="ident">x</span>..];
<span class="ident">dequantize_and_idct_block</span>(<span class="ident">component</span>.<span class="ident">dct_scale</span>, <span class="ident">coefficients</span>, <span class="ident">quantization_table</span>, <span class="ident">line_stride</span>, <span class="ident">output</span>);
}
<span class="self">self</span>.<span class="ident">offsets</span>[<span class="ident">index</span>] <span class="op">+</span><span class="op">=</span> <span class="ident">block_count</span> <span class="op">*</span> <span class="ident">component</span>.<span class="ident">dct_scale</span> <span class="op">*</span> <span class="ident">component</span>.<span class="ident">dct_scale</span>;
}
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_result_immediate</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">index</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span> {
<span class="ident">mem::replace</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">results</span>[<span class="ident">index</span>], <span class="ident">Vec::new</span>())
}
}
<span class="kw">impl</span> <span class="ident">Worker</span> <span class="kw">for</span> <span class="ident">ImmediateWorker</span> {
<span class="kw">fn</span> <span class="ident">new</span>() <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="self">Self</span><span class="op">></span> {
<span class="prelude-val">Ok</span>(<span class="ident">ImmediateWorker::new_immediate</span>())
}
<span class="kw">fn</span> <span class="ident">start</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">data</span>: <span class="ident">RowData</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> {
<span class="self">self</span>.<span class="ident">start_immediate</span>(<span class="ident">data</span>);
<span class="prelude-val">Ok</span>(())
}
<span class="kw">fn</span> <span class="ident">append_row</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">row</span>: (<span class="ident">usize</span>, <span class="ident">Vec</span><span class="op"><</span><span class="ident">i16</span><span class="op">></span>)) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> {
<span class="self">self</span>.<span class="ident">append_row_immediate</span>(<span class="ident">row</span>);
<span class="prelude-val">Ok</span>(())
}
<span class="kw">fn</span> <span class="ident">get_result</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">index</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span><span class="op">></span> {
<span class="prelude-val">Ok</span>(<span class="self">self</span>.<span class="ident">get_result_immediate</span>(<span class="ident">index</span>))
}
}
</pre></div>
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