| <!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/image-0.23.14/./src/io/free_functions.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>free_functions.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="../../../image/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="../../../image/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>std::fs::File; |
| <span class="kw">use </span>std::io::{BufRead, BufReader, BufWriter, Seek}; |
| <span class="kw">use </span>std::path::Path; |
| <span class="kw">use </span>std::u32; |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"bmp"</span>)] |
| </span><span class="kw">use </span><span class="kw">crate</span>::codecs::bmp; |
| <span class="attribute">#[cfg(feature = <span class="string">"gif"</span>)] |
| </span><span class="kw">use </span><span class="kw">crate</span>::codecs::gif; |
| <span class="attribute">#[cfg(feature = <span class="string">"hdr"</span>)] |
| </span><span class="kw">use </span><span class="kw">crate</span>::codecs::hdr; |
| <span class="attribute">#[cfg(feature = <span class="string">"ico"</span>)] |
| </span><span class="kw">use </span><span class="kw">crate</span>::codecs::ico; |
| <span class="attribute">#[cfg(feature = <span class="string">"jpeg"</span>)] |
| </span><span class="kw">use </span><span class="kw">crate</span>::codecs::jpeg; |
| <span class="attribute">#[cfg(feature = <span class="string">"png"</span>)] |
| </span><span class="kw">use </span><span class="kw">crate</span>::codecs::png; |
| <span class="attribute">#[cfg(feature = <span class="string">"pnm"</span>)] |
| </span><span class="kw">use </span><span class="kw">crate</span>::codecs::pnm; |
| <span class="attribute">#[cfg(feature = <span class="string">"tga"</span>)] |
| </span><span class="kw">use </span><span class="kw">crate</span>::codecs::tga; |
| <span class="attribute">#[cfg(feature = <span class="string">"dds"</span>)] |
| </span><span class="kw">use </span><span class="kw">crate</span>::codecs::dds; |
| <span class="attribute">#[cfg(feature = <span class="string">"tiff"</span>)] |
| </span><span class="kw">use </span><span class="kw">crate</span>::codecs::tiff; |
| <span class="attribute">#[cfg(feature = <span class="string">"webp"</span>)] |
| </span><span class="kw">use </span><span class="kw">crate</span>::codecs::webp; |
| <span class="attribute">#[cfg(feature = <span class="string">"farbfeld"</span>)] |
| </span><span class="kw">use </span><span class="kw">crate</span>::codecs::farbfeld; |
| <span class="attribute">#[cfg(any(feature = <span class="string">"avif-encoder"</span>, feature = <span class="string">"avif-decoder"</span>))] |
| </span><span class="kw">use </span><span class="kw">crate</span>::codecs::avif; |
| |
| <span class="kw">use </span><span class="kw">crate</span>::color; |
| <span class="kw">use </span><span class="kw">crate</span>::image; |
| <span class="kw">use </span><span class="kw">crate</span>::dynimage::DynamicImage; |
| <span class="kw">use </span><span class="kw">crate</span>::error::{ImageError, ImageFormatHint, ImageResult}; |
| <span class="kw">use </span><span class="kw">crate</span>::image::ImageFormat; |
| <span class="attribute">#[allow(unused_imports)] </span><span class="comment">// When no features are supported |
| </span><span class="kw">use </span><span class="kw">crate</span>::image::{ImageDecoder, ImageEncoder}; |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>open_impl(path: <span class="kw-2">&</span>Path) -> ImageResult<DynamicImage> { |
| <span class="kw">let </span>fin = <span class="kw">match </span>File::open(path) { |
| <span class="prelude-val">Ok</span>(f) => f, |
| <span class="prelude-val">Err</span>(err) => <span class="kw">return </span><span class="prelude-val">Err</span>(ImageError::IoError(err)), |
| }; |
| <span class="kw">let </span>fin = BufReader::new(fin); |
| |
| load(fin, ImageFormat::from_path(path)<span class="question-mark">?</span>) |
| } |
| |
| <span class="doccomment">/// Create a new image from a Reader |
| /// |
| /// Try [`io::Reader`] for more advanced uses. |
| /// |
| /// [`io::Reader`]: io/struct.Reader.html |
| </span><span class="attribute">#[allow(unused_variables)] |
| </span><span class="comment">// r is unused if no features are supported. |
| </span><span class="kw">pub fn </span>load<R: BufRead + Seek>(r: R, format: ImageFormat) -> ImageResult<DynamicImage> { |
| <span class="attribute">#[allow(unreachable_patterns)] |
| </span><span class="comment">// Default is unreachable if all features are supported. |
| </span><span class="kw">match </span>format { |
| <span class="attribute">#[cfg(feature = <span class="string">"avif-decoder"</span>)] |
| </span>image::ImageFormat::Avif => DynamicImage::from_decoder(avif::AvifDecoder::new(r)<span class="question-mark">?</span>), |
| <span class="attribute">#[cfg(feature = <span class="string">"png"</span>)] |
| </span>image::ImageFormat::Png => DynamicImage::from_decoder(png::PngDecoder::new(r)<span class="question-mark">?</span>), |
| <span class="attribute">#[cfg(feature = <span class="string">"gif"</span>)] |
| </span>image::ImageFormat::Gif => DynamicImage::from_decoder(gif::GifDecoder::new(r)<span class="question-mark">?</span>), |
| <span class="attribute">#[cfg(feature = <span class="string">"jpeg"</span>)] |
| </span>image::ImageFormat::Jpeg => DynamicImage::from_decoder(jpeg::JpegDecoder::new(r)<span class="question-mark">?</span>), |
| <span class="attribute">#[cfg(feature = <span class="string">"webp"</span>)] |
| </span>image::ImageFormat::WebP => DynamicImage::from_decoder(webp::WebPDecoder::new(r)<span class="question-mark">?</span>), |
| <span class="attribute">#[cfg(feature = <span class="string">"tiff"</span>)] |
| </span>image::ImageFormat::Tiff => DynamicImage::from_decoder(tiff::TiffDecoder::new(r)<span class="question-mark">?</span>), |
| <span class="attribute">#[cfg(feature = <span class="string">"tga"</span>)] |
| </span>image::ImageFormat::Tga => DynamicImage::from_decoder(tga::TgaDecoder::new(r)<span class="question-mark">?</span>), |
| <span class="attribute">#[cfg(feature = <span class="string">"dds"</span>)] |
| </span>image::ImageFormat::Dds => DynamicImage::from_decoder(dds::DdsDecoder::new(r)<span class="question-mark">?</span>), |
| <span class="attribute">#[cfg(feature = <span class="string">"bmp"</span>)] |
| </span>image::ImageFormat::Bmp => DynamicImage::from_decoder(bmp::BmpDecoder::new(r)<span class="question-mark">?</span>), |
| <span class="attribute">#[cfg(feature = <span class="string">"ico"</span>)] |
| </span>image::ImageFormat::Ico => DynamicImage::from_decoder(ico::IcoDecoder::new(r)<span class="question-mark">?</span>), |
| <span class="attribute">#[cfg(feature = <span class="string">"hdr"</span>)] |
| </span>image::ImageFormat::Hdr => DynamicImage::from_decoder(hdr::HdrAdapter::new(BufReader::new(r))<span class="question-mark">?</span>), |
| <span class="attribute">#[cfg(feature = <span class="string">"pnm"</span>)] |
| </span>image::ImageFormat::Pnm => DynamicImage::from_decoder(pnm::PnmDecoder::new(BufReader::new(r))<span class="question-mark">?</span>), |
| <span class="attribute">#[cfg(feature = <span class="string">"farbfeld"</span>)] |
| </span>image::ImageFormat::Farbfeld => DynamicImage::from_decoder(farbfeld::FarbfeldDecoder::new(r)<span class="question-mark">?</span>), |
| <span class="kw">_ </span>=> <span class="prelude-val">Err</span>(ImageError::Unsupported(ImageFormatHint::Exact(format).into())), |
| } |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>image_dimensions_impl(path: <span class="kw-2">&</span>Path) -> ImageResult<(u32, u32)> { |
| <span class="kw">let </span>format = image::ImageFormat::from_path(path)<span class="question-mark">?</span>; |
| |
| <span class="kw">let </span>fin = File::open(path)<span class="question-mark">?</span>; |
| <span class="kw">let </span>fin = BufReader::new(fin); |
| |
| image_dimensions_with_format_impl(fin, format) |
| } |
| |
| <span class="attribute">#[allow(unused_variables)] |
| </span><span class="comment">// fin is unused if no features are supported. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>image_dimensions_with_format_impl<R: BufRead + Seek>(fin: R, format: ImageFormat) |
| -> ImageResult<(u32, u32)> |
| { |
| <span class="attribute">#[allow(unreachable_patterns,unreachable_code)] |
| </span><span class="comment">// Default is unreachable if all features are supported. |
| // Code after the match is unreachable if none are. |
| </span><span class="prelude-val">Ok</span>(<span class="kw">match </span>format { |
| <span class="attribute">#[cfg(feature = <span class="string">"avif-decoder"</span>)] |
| </span>image::ImageFormat::Avif => avif::AvifDecoder::new(fin)<span class="question-mark">?</span>.dimensions(), |
| <span class="attribute">#[cfg(feature = <span class="string">"jpeg"</span>)] |
| </span>image::ImageFormat::Jpeg => jpeg::JpegDecoder::new(fin)<span class="question-mark">?</span>.dimensions(), |
| <span class="attribute">#[cfg(feature = <span class="string">"png"</span>)] |
| </span>image::ImageFormat::Png => png::PngDecoder::new(fin)<span class="question-mark">?</span>.dimensions(), |
| <span class="attribute">#[cfg(feature = <span class="string">"gif"</span>)] |
| </span>image::ImageFormat::Gif => gif::GifDecoder::new(fin)<span class="question-mark">?</span>.dimensions(), |
| <span class="attribute">#[cfg(feature = <span class="string">"webp"</span>)] |
| </span>image::ImageFormat::WebP => webp::WebPDecoder::new(fin)<span class="question-mark">?</span>.dimensions(), |
| <span class="attribute">#[cfg(feature = <span class="string">"tiff"</span>)] |
| </span>image::ImageFormat::Tiff => tiff::TiffDecoder::new(fin)<span class="question-mark">?</span>.dimensions(), |
| <span class="attribute">#[cfg(feature = <span class="string">"tga"</span>)] |
| </span>image::ImageFormat::Tga => tga::TgaDecoder::new(fin)<span class="question-mark">?</span>.dimensions(), |
| <span class="attribute">#[cfg(feature = <span class="string">"dds"</span>)] |
| </span>image::ImageFormat::Dds => dds::DdsDecoder::new(fin)<span class="question-mark">?</span>.dimensions(), |
| <span class="attribute">#[cfg(feature = <span class="string">"bmp"</span>)] |
| </span>image::ImageFormat::Bmp => bmp::BmpDecoder::new(fin)<span class="question-mark">?</span>.dimensions(), |
| <span class="attribute">#[cfg(feature = <span class="string">"ico"</span>)] |
| </span>image::ImageFormat::Ico => ico::IcoDecoder::new(fin)<span class="question-mark">?</span>.dimensions(), |
| <span class="attribute">#[cfg(feature = <span class="string">"hdr"</span>)] |
| </span>image::ImageFormat::Hdr => hdr::HdrAdapter::new(fin)<span class="question-mark">?</span>.dimensions(), |
| <span class="attribute">#[cfg(feature = <span class="string">"pnm"</span>)] |
| </span>image::ImageFormat::Pnm => { |
| pnm::PnmDecoder::new(fin)<span class="question-mark">?</span>.dimensions() |
| } |
| format => <span class="kw">return </span><span class="prelude-val">Err</span>(ImageError::Unsupported(ImageFormatHint::Exact(format).into())), |
| }) |
| } |
| |
| <span class="attribute">#[allow(unused_variables)] |
| </span><span class="comment">// Most variables when no features are supported |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>save_buffer_impl( |
| path: <span class="kw-2">&</span>Path, |
| buf: <span class="kw-2">&</span>[u8], |
| width: u32, |
| height: u32, |
| color: color::ColorType, |
| ) -> ImageResult<()> { |
| <span class="kw">let </span>fout = <span class="kw-2">&mut </span>BufWriter::new(File::create(path)<span class="question-mark">?</span>); |
| <span class="kw">let </span>format = ImageFormat::from_path(path)<span class="question-mark">?</span>; |
| save_buffer_with_format_impl(path, buf, width, height, color, format) |
| } |
| |
| <span class="attribute">#[allow(unused_variables)] |
| </span><span class="comment">// Most variables when no features are supported |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>save_buffer_with_format_impl( |
| path: <span class="kw-2">&</span>Path, |
| buf: <span class="kw-2">&</span>[u8], |
| width: u32, |
| height: u32, |
| color: color::ColorType, |
| format: ImageFormat, |
| ) -> ImageResult<()> { |
| <span class="kw">let </span>fout = <span class="kw-2">&mut </span>BufWriter::new(File::create(path)<span class="question-mark">?</span>); |
| |
| <span class="kw">match </span>format { |
| <span class="attribute">#[cfg(feature = <span class="string">"gif"</span>)] |
| </span>image::ImageFormat::Gif => gif::GifEncoder::new(fout).encode(buf, width, height, color), |
| <span class="attribute">#[cfg(feature = <span class="string">"ico"</span>)] |
| </span>image::ImageFormat::Ico => ico::IcoEncoder::new(fout).write_image(buf, width, height, color), |
| <span class="attribute">#[cfg(feature = <span class="string">"jpeg"</span>)] |
| </span>image::ImageFormat::Jpeg => jpeg::JpegEncoder::new(fout).write_image(buf, width, height, color), |
| <span class="attribute">#[cfg(feature = <span class="string">"png"</span>)] |
| </span>image::ImageFormat::Png => png::PngEncoder::new(fout).write_image(buf, width, height, color), |
| <span class="attribute">#[cfg(feature = <span class="string">"pnm"</span>)] |
| </span>image::ImageFormat::Pnm => { |
| <span class="kw">let </span>ext = path.extension() |
| .and_then(|s| s.to_str()) |
| .map_or(<span class="string">""</span>.to_string(), |s| s.to_ascii_lowercase()); |
| <span class="kw">match </span><span class="kw-2">&*</span>ext { |
| <span class="string">"pbm" </span>=> pnm::PnmEncoder::new(fout) |
| .with_subtype(pnm::PNMSubtype::Bitmap(pnm::SampleEncoding::Binary)) |
| .write_image(buf, width, height, color), |
| <span class="string">"pgm" </span>=> pnm::PnmEncoder::new(fout) |
| .with_subtype(pnm::PNMSubtype::Graymap(pnm::SampleEncoding::Binary)) |
| .write_image(buf, width, height, color), |
| <span class="string">"ppm" </span>=> pnm::PnmEncoder::new(fout) |
| .with_subtype(pnm::PNMSubtype::Pixmap(pnm::SampleEncoding::Binary)) |
| .write_image(buf, width, height, color), |
| <span class="string">"pam" </span>=> pnm::PnmEncoder::new(fout).write_image(buf, width, height, color), |
| <span class="kw">_ </span>=> <span class="prelude-val">Err</span>(ImageError::Unsupported(ImageFormatHint::Exact(format).into())), <span class="comment">// Unsupported Pnm subtype. |
| </span>} |
| }, |
| <span class="attribute">#[cfg(feature = <span class="string">"farbfeld"</span>)] |
| </span>image::ImageFormat::Farbfeld => farbfeld::FarbfeldEncoder::new(fout).write_image(buf, width, height, color), |
| <span class="attribute">#[cfg(feature = <span class="string">"avif-encoder"</span>)] |
| </span>image::ImageFormat::Avif => avif::AvifEncoder::new(fout).write_image(buf, width, height, color), |
| <span class="comment">// #[cfg(feature = "hdr")] |
| // image::ImageFormat::Hdr => hdr::HdrEncoder::new(fout).encode(&[Rgb<f32>], width, height), // usize |
| </span><span class="attribute">#[cfg(feature = <span class="string">"bmp"</span>)] |
| </span>image::ImageFormat::Bmp => bmp::BmpEncoder::new(fout).write_image(buf, width, height, color), |
| <span class="attribute">#[cfg(feature = <span class="string">"tiff"</span>)] |
| </span>image::ImageFormat::Tiff => tiff::TiffEncoder::new(fout) |
| .write_image(buf, width, height, color), |
| <span class="attribute">#[cfg(feature = <span class="string">"tga"</span>)] |
| </span>image::ImageFormat::Tga => tga::TgaEncoder::new(fout).write_image(buf, width, height, color), |
| format => <span class="prelude-val">Err</span>(ImageError::Unsupported(ImageFormatHint::Exact(format).into())), |
| } |
| } |
| |
| <span class="kw">static </span>MAGIC_BYTES: [(<span class="kw-2">&</span>[u8], ImageFormat); <span class="number">20</span>] = [ |
| (<span class="string">b"\x89PNG\r\n\x1a\n"</span>, ImageFormat::Png), |
| (<span class="kw-2">&</span>[<span class="number">0xff</span>, <span class="number">0xd8</span>, <span class="number">0xff</span>], ImageFormat::Jpeg), |
| (<span class="string">b"GIF89a"</span>, ImageFormat::Gif), |
| (<span class="string">b"GIF87a"</span>, ImageFormat::Gif), |
| (<span class="string">b"RIFF"</span>, ImageFormat::WebP), <span class="comment">// TODO: better magic byte detection, see https://github.com/image-rs/image/issues/660 |
| </span>(<span class="string">b"MM\x00*"</span>, ImageFormat::Tiff), |
| (<span class="string">b"II*\x00"</span>, ImageFormat::Tiff), |
| (<span class="string">b"DDS "</span>, ImageFormat::Dds), |
| (<span class="string">b"BM"</span>, ImageFormat::Bmp), |
| (<span class="kw-2">&</span>[<span class="number">0</span>, <span class="number">0</span>, <span class="number">1</span>, <span class="number">0</span>], ImageFormat::Ico), |
| (<span class="string">b"#?RADIANCE"</span>, ImageFormat::Hdr), |
| (<span class="string">b"P1"</span>, ImageFormat::Pnm), |
| (<span class="string">b"P2"</span>, ImageFormat::Pnm), |
| (<span class="string">b"P3"</span>, ImageFormat::Pnm), |
| (<span class="string">b"P4"</span>, ImageFormat::Pnm), |
| (<span class="string">b"P5"</span>, ImageFormat::Pnm), |
| (<span class="string">b"P6"</span>, ImageFormat::Pnm), |
| (<span class="string">b"P7"</span>, ImageFormat::Pnm), |
| (<span class="string">b"farbfeld"</span>, ImageFormat::Farbfeld), |
| (<span class="string">b"\0\0\0 ftypavif"</span>, ImageFormat::Avif), |
| ]; |
| |
| <span class="doccomment">/// Guess image format from memory block |
| /// |
| /// Makes an educated guess about the image format based on the Magic Bytes at the beginning. |
| /// TGA is not supported by this function. |
| /// This is not to be trusted on the validity of the whole memory block |
| </span><span class="kw">pub fn </span>guess_format(buffer: <span class="kw-2">&</span>[u8]) -> ImageResult<ImageFormat> { |
| <span class="kw">match </span>guess_format_impl(buffer) { |
| <span class="prelude-val">Some</span>(format) => <span class="prelude-val">Ok</span>(format), |
| <span class="prelude-val">None </span>=> <span class="prelude-val">Err</span>(ImageError::Unsupported(ImageFormatHint::Unknown.into())), |
| } |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>guess_format_impl(buffer: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Option</span><ImageFormat> { |
| <span class="kw">for </span><span class="kw-2">&</span>(signature, format) <span class="kw">in </span><span class="kw-2">&</span>MAGIC_BYTES { |
| <span class="kw">if </span>buffer.starts_with(signature) { |
| <span class="kw">return </span><span class="prelude-val">Some</span>(format); |
| } |
| } |
| |
| <span class="prelude-val">None |
| </span>} |
| </code></pre></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> |
