| <!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="JPEG decoder"><meta name="keywords" content="rust, rustlang, rust-lang, JpegDecoder"><title>JpegDecoder in image::codecs::jpeg - Rust</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" 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class="sidebar-logo" href="../../../image/index.html"><div class="logo-container"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></div></a><h2></h2></nav><nav class="sidebar"><a class="sidebar-logo" href="../../../image/index.html"><div class="logo-container"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></div></a><h2 class="location"><a href="#">JpegDecoder</a></h2><div class="sidebar-elems"><section><h3><a href="#implementations">Methods</a></h3><ul class="block"><li><a href="#method.new">new</a></li><li><a href="#method.scale">scale</a></li></ul><h3><a href="#trait-implementations">Trait Implementations</a></h3><ul class="block"><li><a href="#impl-ImageDecoder%3C%27a%3E-for-JpegDecoder%3CR%3E">ImageDecoder<'a></a></li></ul><h3><a href="#synthetic-implementations">Auto Trait Implementations</a></h3><ul class="block"><li><a href="#impl-RefUnwindSafe-for-JpegDecoder%3CR%3E">RefUnwindSafe</a></li><li><a href="#impl-Send-for-JpegDecoder%3CR%3E">Send</a></li><li><a href="#impl-Sync-for-JpegDecoder%3CR%3E">Sync</a></li><li><a href="#impl-Unpin-for-JpegDecoder%3CR%3E">Unpin</a></li><li><a href="#impl-UnwindSafe-for-JpegDecoder%3CR%3E">UnwindSafe</a></li></ul><h3><a href="#blanket-implementations">Blanket Implementations</a></h3><ul class="block"><li><a href="#impl-Any-for-JpegDecoder%3CR%3E">Any</a></li><li><a href="#impl-Borrow%3CT%3E-for-JpegDecoder%3CR%3E">Borrow<T></a></li><li><a href="#impl-BorrowMut%3CT%3E-for-JpegDecoder%3CR%3E">BorrowMut<T></a></li><li><a href="#impl-From%3CT%3E-for-JpegDecoder%3CR%3E">From<T></a></li><li><a href="#impl-Into%3CU%3E-for-JpegDecoder%3CR%3E">Into<U></a></li><li><a href="#impl-TryFrom%3CU%3E-for-JpegDecoder%3CR%3E">TryFrom<U></a></li><li><a href="#impl-TryInto%3CU%3E-for-JpegDecoder%3CR%3E">TryInto<U></a></li></ul></section><h2><a href="index.html">In image::codecs::jpeg</a></h2></div></nav><main><div class="width-limiter"><nav class="sub"><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="main-heading"><h1 class="fqn">Struct <a href="../../index.html">image</a>::<wbr><a href="../index.html">codecs</a>::<wbr><a href="index.html">jpeg</a>::<wbr><a class="struct" href="#">JpegDecoder</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../../../clipboard.svg" width="19" height="18" alt="Copy item path"></button></h1><span class="out-of-band"><a class="srclink" href="../../../src/image/codecs/jpeg/decoder.rs.html#13-16">source</a> · <a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">−</span>]</a></span></div><div class="item-decl"><pre class="rust struct"><code>pub struct JpegDecoder<R> { /* private fields */ }</code></pre></div><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>JPEG decoder</p> |
| </div></details><h2 id="implementations" class="small-section-header">Implementations<a href="#implementations" class="anchor"></a></h2><div id="implementations-list"><details class="rustdoc-toggle implementors-toggle" open><summary><section id="impl-JpegDecoder%3CR%3E" class="impl has-srclink"><a class="srclink rightside" href="../../../src/image/codecs/jpeg/decoder.rs.html#18-65">source</a><a href="#impl-JpegDecoder%3CR%3E" class="anchor"></a><h3 class="code-header">impl<R: Read> <a class="struct" href="struct.JpegDecoder.html" title="struct image::codecs::jpeg::JpegDecoder">JpegDecoder</a><R></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.new" class="method has-srclink"><a class="srclink rightside" href="../../../src/image/codecs/jpeg/decoder.rs.html#20-37">source</a><h4 class="code-header">pub fn <a href="#method.new" class="fnname">new</a>(r: R) -> <a class="type" href="../../error/type.ImageResult.html" title="type image::error::ImageResult">ImageResult</a><<a class="struct" href="struct.JpegDecoder.html" title="struct image::codecs::jpeg::JpegDecoder">JpegDecoder</a><R>></h4></section></summary><div class="docblock"><p>Create a new decoder that decodes from the stream <code>r</code></p> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.scale" class="method has-srclink"><a class="srclink rightside" href="../../../src/image/codecs/jpeg/decoder.rs.html#52-64">source</a><h4 class="code-header">pub fn <a href="#method.scale" class="fnname">scale</a>(<br> &mut self,<br> requested_width: u16,<br> requested_height: u16<br>) -> <a class="type" href="../../error/type.ImageResult.html" title="type image::error::ImageResult">ImageResult</a><(u16, u16)></h4></section></summary><div class="docblock"><p>Configure the decoder to scale the image during decoding.</p> |
| <p>This efficiently scales the image by the smallest supported |
| scale factor that produces an image larger than or equal to |
| the requested size in at least one axis. The currently |
| implemented scale factors are 1/8, 1/4, 1/2 and 1.</p> |
| <p>To generate a thumbnail of an exact size, pass the desired |
| size and then scale to the final size using a traditional |
| resampling algorithm.</p> |
| <p>The size of the image to be loaded, with the scale factor |
| applied, is returned.</p> |
| </div></details></div></details></div><h2 id="trait-implementations" class="small-section-header">Trait Implementations<a href="#trait-implementations" class="anchor"></a></h2><div id="trait-implementations-list"><details class="rustdoc-toggle implementors-toggle" open><summary><section id="impl-ImageDecoder%3C%27a%3E-for-JpegDecoder%3CR%3E" class="impl has-srclink"><a class="srclink rightside" href="../../../src/image/codecs/jpeg/decoder.rs.html#83-116">source</a><a href="#impl-ImageDecoder%3C%27a%3E-for-JpegDecoder%3CR%3E" class="anchor"></a><h3 class="code-header">impl<'a, R: 'a + Read> <a class="trait" href="../../trait.ImageDecoder.html" title="trait image::ImageDecoder">ImageDecoder</a><'a> for <a class="struct" href="struct.JpegDecoder.html" title="struct image::codecs::jpeg::JpegDecoder">JpegDecoder</a><R></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle" open><summary><section id="associatedtype.Reader" class="associatedtype trait-impl has-srclink"><a href="#associatedtype.Reader" class="anchor"></a><h4 class="code-header">type <a href="../../trait.ImageDecoder.html#associatedtype.Reader" class="associatedtype">Reader</a> = JpegReader<R></h4></section></summary><div class='docblock'>The type of reader produced by <code>into_reader</code>.</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.dimensions" class="method trait-impl has-srclink"><a class="srclink rightside" href="../../../src/image/codecs/jpeg/decoder.rs.html#86-88">source</a><a href="#method.dimensions" class="anchor"></a><h4 class="code-header">fn <a href="../../trait.ImageDecoder.html#tymethod.dimensions" class="fnname">dimensions</a>(&self) -> (u32, u32)</h4></section></summary><div class='docblock'>Returns a tuple containing the width and height of the image</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.color_type" class="method trait-impl has-srclink"><a class="srclink rightside" href="../../../src/image/codecs/jpeg/decoder.rs.html#90-92">source</a><a href="#method.color_type" class="anchor"></a><h4 class="code-header">fn <a href="../../trait.ImageDecoder.html#tymethod.color_type" class="fnname">color_type</a>(&self) -> <a class="enum" href="../../enum.ColorType.html" title="enum image::ColorType">ColorType</a></h4></section></summary><div class='docblock'>Returns the color type of the image data produced by this decoder</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.into_reader" class="method trait-impl has-srclink"><a class="srclink rightside" href="../../../src/image/codecs/jpeg/decoder.rs.html#94-102">source</a><a href="#method.into_reader" class="anchor"></a><h4 class="code-header">fn <a href="../../trait.ImageDecoder.html#tymethod.into_reader" class="fnname">into_reader</a>(self) -> <a class="type" href="../../error/type.ImageResult.html" title="type image::error::ImageResult">ImageResult</a><Self::<a class="associatedtype" href="../../trait.ImageDecoder.html#associatedtype.Reader" title="type image::ImageDecoder::Reader">Reader</a>></h4></section></summary><div class='docblock'>Returns a reader that can be used to obtain the bytes of the image. For the best |
| performance, always try to read at least <code>scanline_bytes</code> from the reader at a time. Reading |
| fewer bytes will cause the reader to perform internal buffering. <a href="../../trait.ImageDecoder.html#tymethod.into_reader">Read more</a></div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.read_image" class="method trait-impl has-srclink"><a class="srclink rightside" href="../../../src/image/codecs/jpeg/decoder.rs.html#104-115">source</a><a href="#method.read_image" class="anchor"></a><h4 class="code-header">fn <a href="../../trait.ImageDecoder.html#method.read_image" class="fnname">read_image</a>(self, buf: &mut [u8]) -> <a class="type" href="../../error/type.ImageResult.html" title="type image::error::ImageResult">ImageResult</a><()></h4></section></summary><div class='docblock'>Returns all the bytes in the image. <a href="../../trait.ImageDecoder.html#method.read_image">Read more</a></div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.original_color_type" class="method trait-impl has-srclink"><a class="srclink rightside" href="../../../src/image/image.rs.html#537-539">source</a><a href="#method.original_color_type" class="anchor"></a><h4 class="code-header">fn <a href="../../trait.ImageDecoder.html#method.original_color_type" class="fnname">original_color_type</a>(&self) -> <a class="enum" href="../../enum.ExtendedColorType.html" title="enum image::ExtendedColorType">ExtendedColorType</a></h4></section></summary><div class='docblock'>Retuns the color type of the image file before decoding</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.total_bytes" class="method trait-impl has-srclink"><a class="srclink rightside" href="../../../src/image/image.rs.html#552-555">source</a><a href="#method.total_bytes" class="anchor"></a><h4 class="code-header">fn <a href="../../trait.ImageDecoder.html#method.total_bytes" class="fnname">total_bytes</a>(&self) -> u64</h4></section></summary><div class='docblock'>Returns the total number of bytes in the decoded image. <a href="../../trait.ImageDecoder.html#method.total_bytes">Read more</a></div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.scanline_bytes" class="method trait-impl has-srclink"><a class="srclink rightside" href="../../../src/image/image.rs.html#559-561">source</a><a href="#method.scanline_bytes" class="anchor"></a><h4 class="code-header">fn <a href="../../trait.ImageDecoder.html#method.scanline_bytes" class="fnname">scanline_bytes</a>(&self) -> u64</h4></section></summary><div class='docblock'>Returns the minimum number of bytes that can be efficiently read from this decoder. This may |
| be as few as 1 or as many as <code>total_bytes()</code>. <a href="../../trait.ImageDecoder.html#method.scanline_bytes">Read more</a></div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.read_image_with_progress" class="method trait-impl has-srclink"><a class="srclink rightside" href="../../../src/image/image.rs.html#589-619">source</a><a href="#method.read_image_with_progress" class="anchor"></a><h4 class="code-header">fn <a href="../../trait.ImageDecoder.html#method.read_image_with_progress" class="fnname">read_image_with_progress</a><F: Fn(<a class="struct" href="../../struct.Progress.html" title="struct image::Progress">Progress</a>)>(<br> self,<br> buf: &mut [u8],<br> progress_callback: F<br>) -> <a class="type" href="../../error/type.ImageResult.html" title="type image::error::ImageResult">ImageResult</a><()></h4></section></summary><div class='docblock'>Same as <code>read_image</code> but periodically calls the provided callback to give updates on loading |
| progress. <a href="../../trait.ImageDecoder.html#method.read_image_with_progress">Read more</a></div></details></div></details></div><h2 id="synthetic-implementations" class="small-section-header">Auto Trait Implementations<a href="#synthetic-implementations" class="anchor"></a></h2><div id="synthetic-implementations-list"><section id="impl-RefUnwindSafe-for-JpegDecoder%3CR%3E" class="impl has-srclink"><a href="#impl-RefUnwindSafe-for-JpegDecoder%3CR%3E" class="anchor"></a><h3 class="code-header">impl<R> RefUnwindSafe for <a class="struct" href="struct.JpegDecoder.html" title="struct image::codecs::jpeg::JpegDecoder">JpegDecoder</a><R><span class="where fmt-newline">where<br> R: RefUnwindSafe,</span></h3></section><section id="impl-Send-for-JpegDecoder%3CR%3E" class="impl has-srclink"><a href="#impl-Send-for-JpegDecoder%3CR%3E" class="anchor"></a><h3 class="code-header">impl<R> Send for <a class="struct" href="struct.JpegDecoder.html" title="struct image::codecs::jpeg::JpegDecoder">JpegDecoder</a><R><span class="where fmt-newline">where<br> R: Send,</span></h3></section><section id="impl-Sync-for-JpegDecoder%3CR%3E" class="impl has-srclink"><a href="#impl-Sync-for-JpegDecoder%3CR%3E" class="anchor"></a><h3 class="code-header">impl<R> Sync for <a class="struct" href="struct.JpegDecoder.html" title="struct image::codecs::jpeg::JpegDecoder">JpegDecoder</a><R><span class="where fmt-newline">where<br> R: Sync,</span></h3></section><section id="impl-Unpin-for-JpegDecoder%3CR%3E" class="impl has-srclink"><a href="#impl-Unpin-for-JpegDecoder%3CR%3E" class="anchor"></a><h3 class="code-header">impl<R> Unpin for <a class="struct" href="struct.JpegDecoder.html" title="struct image::codecs::jpeg::JpegDecoder">JpegDecoder</a><R><span class="where fmt-newline">where<br> R: Unpin,</span></h3></section><section id="impl-UnwindSafe-for-JpegDecoder%3CR%3E" class="impl has-srclink"><a href="#impl-UnwindSafe-for-JpegDecoder%3CR%3E" class="anchor"></a><h3 class="code-header">impl<R> UnwindSafe for <a class="struct" href="struct.JpegDecoder.html" title="struct image::codecs::jpeg::JpegDecoder">JpegDecoder</a><R><span class="where fmt-newline">where<br> R: UnwindSafe,</span></h3></section></div><h2 id="blanket-implementations" class="small-section-header">Blanket Implementations<a href="#blanket-implementations" class="anchor"></a></h2><div id="blanket-implementations-list"><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-Any-for-JpegDecoder%3CR%3E" class="impl has-srclink"><a href="#impl-Any-for-JpegDecoder%3CR%3E" class="anchor"></a><h3 class="code-header">impl<T> Any for T<span class="where fmt-newline">where<br> T: 'static + ?Sized,</span></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.type_id" class="method trait-impl has-srclink"><a href="#method.type_id" class="anchor"></a><h4 class="code-header">fn <a class="fnname">type_id</a>(&self) -> TypeId</h4></section></summary><div class='docblock'>Gets the <code>TypeId</code> of <code>self</code>. <a>Read more</a></div></details></div></details><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-Borrow%3CT%3E-for-JpegDecoder%3CR%3E" class="impl has-srclink"><a href="#impl-Borrow%3CT%3E-for-JpegDecoder%3CR%3E" class="anchor"></a><h3 class="code-header">impl<T> Borrow<T> for T<span class="where fmt-newline">where<br> T: ?Sized,</span></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.borrow" class="method trait-impl has-srclink"><span class="since rightside" title="const unstable">const: <a href="https://github.com/rust-lang/rust/issues/91522" title="Tracking issue for const_borrow">unstable</a></span><a href="#method.borrow" class="anchor"></a><h4 class="code-header">fn <a class="fnname">borrow</a>(&self) -> &T</h4></section></summary><div class='docblock'>Immutably borrows from an owned value. <a>Read more</a></div></details></div></details><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-BorrowMut%3CT%3E-for-JpegDecoder%3CR%3E" class="impl has-srclink"><a href="#impl-BorrowMut%3CT%3E-for-JpegDecoder%3CR%3E" class="anchor"></a><h3 class="code-header">impl<T> BorrowMut<T> for T<span class="where fmt-newline">where<br> T: ?Sized,</span></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.borrow_mut" class="method trait-impl has-srclink"><span class="since rightside" title="const unstable">const: <a href="https://github.com/rust-lang/rust/issues/91522" title="Tracking issue for const_borrow">unstable</a></span><a href="#method.borrow_mut" class="anchor"></a><h4 class="code-header">fn <a class="fnname">borrow_mut</a>(&mut self) -> &mut T</h4></section></summary><div class='docblock'>Mutably borrows from an owned value. <a>Read more</a></div></details></div></details><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-From%3CT%3E-for-JpegDecoder%3CR%3E" class="impl has-srclink"><a href="#impl-From%3CT%3E-for-JpegDecoder%3CR%3E" class="anchor"></a><h3 class="code-header">impl<T> From<T> for T</h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.from" class="method trait-impl has-srclink"><span class="since rightside" title="const unstable">const: <a href="https://github.com/rust-lang/rust/issues/88674" title="Tracking issue for const_convert">unstable</a></span><a href="#method.from" class="anchor"></a><h4 class="code-header">fn <a class="fnname">from</a>(t: T) -> T</h4></section></summary><div class="docblock"><p>Returns the argument unchanged.</p> |
| </div></details></div></details><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-Into%3CU%3E-for-JpegDecoder%3CR%3E" class="impl has-srclink"><a href="#impl-Into%3CU%3E-for-JpegDecoder%3CR%3E" class="anchor"></a><h3 class="code-header">impl<T, U> Into<U> for T<span class="where fmt-newline">where<br> U: From<T>,</span></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.into" class="method trait-impl has-srclink"><span class="since rightside" title="const unstable">const: <a href="https://github.com/rust-lang/rust/issues/88674" title="Tracking issue for const_convert">unstable</a></span><a href="#method.into" class="anchor"></a><h4 class="code-header">fn <a class="fnname">into</a>(self) -> U</h4></section></summary><div class="docblock"><p>Calls <code>U::from(self)</code>.</p> |
| <p>That is, this conversion is whatever the implementation of |
| <code>[From]<T> for U</code> chooses to do.</p> |
| </div></details></div></details><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-TryFrom%3CU%3E-for-JpegDecoder%3CR%3E" class="impl has-srclink"><a href="#impl-TryFrom%3CU%3E-for-JpegDecoder%3CR%3E" class="anchor"></a><h3 class="code-header">impl<T, U> TryFrom<U> for T<span class="where fmt-newline">where<br> U: Into<T>,</span></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle" open><summary><section id="associatedtype.Error-1" class="associatedtype trait-impl has-srclink"><a href="#associatedtype.Error-1" class="anchor"></a><h4 class="code-header">type <a class="associatedtype">Error</a> = Infallible</h4></section></summary><div class='docblock'>The type returned in the event of a conversion error.</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.try_from" class="method trait-impl has-srclink"><span class="since rightside" title="const unstable">const: <a href="https://github.com/rust-lang/rust/issues/88674" title="Tracking issue for const_convert">unstable</a></span><a href="#method.try_from" class="anchor"></a><h4 class="code-header">fn <a class="fnname">try_from</a>(value: U) -> Result<T, <T as TryFrom<U>>::Error></h4></section></summary><div class='docblock'>Performs the conversion.</div></details></div></details><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-TryInto%3CU%3E-for-JpegDecoder%3CR%3E" class="impl has-srclink"><a href="#impl-TryInto%3CU%3E-for-JpegDecoder%3CR%3E" class="anchor"></a><h3 class="code-header">impl<T, U> TryInto<U> for T<span class="where fmt-newline">where<br> U: TryFrom<T>,</span></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle" open><summary><section id="associatedtype.Error" class="associatedtype trait-impl has-srclink"><a href="#associatedtype.Error" class="anchor"></a><h4 class="code-header">type <a class="associatedtype">Error</a> = <U as TryFrom<T>>::Error</h4></section></summary><div class='docblock'>The type returned in the event of a conversion error.</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.try_into" class="method trait-impl has-srclink"><span class="since rightside" title="const unstable">const: <a href="https://github.com/rust-lang/rust/issues/88674" title="Tracking issue for const_convert">unstable</a></span><a href="#method.try_into" class="anchor"></a><h4 class="code-header">fn <a class="fnname">try_into</a>(self) -> Result<U, <U as TryFrom<T>>::Error></h4></section></summary><div class='docblock'>Performs the conversion.</div></details></div></details></div></section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="image" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
