136 lines
3.9 KiB
Rust
136 lines
3.9 KiB
Rust
//! Load and operate on images.
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#[cfg(feature = "image")]
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pub use ::image as image_rs;
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use crate::core::image;
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use crate::core::svg;
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use crate::core::Rectangle;
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/// A raster or vector image.
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#[derive(Debug, Clone, PartialEq)]
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pub enum Image {
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/// A raster image.
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Raster(image::Image, Rectangle),
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/// A vector image.
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Vector(svg::Svg, Rectangle),
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}
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impl Image {
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/// Returns the bounds of the [`Image`].
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pub fn bounds(&self) -> Rectangle {
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match self {
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Image::Raster(image, bounds) => bounds.rotate(image.rotation),
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Image::Vector(svg, bounds) => bounds.rotate(svg.rotation),
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}
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}
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}
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#[cfg(feature = "image")]
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/// Tries to load an image by its [`Handle`].
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///
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/// [`Handle`]: image::Handle
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pub fn load(
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handle: &image::Handle,
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) -> ::image::ImageResult<::image::ImageBuffer<::image::Rgba<u8>, image::Bytes>>
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{
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use bitflags::bitflags;
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bitflags! {
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struct Operation: u8 {
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const FLIP_HORIZONTALLY = 0b001;
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const ROTATE_180 = 0b010;
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const FLIP_DIAGONALLY = 0b100;
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}
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}
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impl Operation {
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// Meaning of the returned value is described e.g. at:
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// https://magnushoff.com/articles/jpeg-orientation/
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fn from_exif<R>(reader: &mut R) -> Result<Self, exif::Error>
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where
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R: std::io::BufRead + std::io::Seek,
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{
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let exif = exif::Reader::new().read_from_container(reader)?;
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Ok(exif
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.get_field(exif::Tag::Orientation, exif::In::PRIMARY)
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.and_then(|field| field.value.get_uint(0))
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.and_then(|value| u8::try_from(value).ok())
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.and_then(|value| Self::from_bits(value.saturating_sub(1)))
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.unwrap_or_else(Self::empty))
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}
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fn perform(
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self,
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mut image: ::image::DynamicImage,
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) -> ::image::DynamicImage {
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use ::image::imageops;
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if self.contains(Self::FLIP_DIAGONALLY) {
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imageops::flip_vertical_in_place(&mut image);
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}
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if self.contains(Self::ROTATE_180) {
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imageops::rotate180_in_place(&mut image);
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}
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if self.contains(Self::FLIP_HORIZONTALLY) {
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imageops::flip_horizontal_in_place(&mut image);
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}
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image
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}
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}
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let (width, height, pixels) = match handle {
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image::Handle::Path(_, path) => {
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let image = ::image::open(path)?;
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let operation = std::fs::File::open(path)
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.ok()
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.map(std::io::BufReader::new)
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.and_then(|mut reader| Operation::from_exif(&mut reader).ok())
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.unwrap_or_else(Operation::empty);
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let rgba = operation.perform(image).into_rgba8();
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(
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rgba.width(),
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rgba.height(),
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image::Bytes::from(rgba.into_raw()),
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)
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}
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image::Handle::Bytes(_, bytes) => {
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let image = ::image::load_from_memory(bytes)?;
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let operation =
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Operation::from_exif(&mut std::io::Cursor::new(bytes))
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.ok()
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.unwrap_or_else(Operation::empty);
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let rgba = operation.perform(image).into_rgba8();
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(
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rgba.width(),
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rgba.height(),
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image::Bytes::from(rgba.into_raw()),
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)
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}
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image::Handle::Rgba {
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width,
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height,
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pixels,
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..
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} => (*width, *height, pixels.clone()),
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};
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if let Some(image) = ::image::ImageBuffer::from_raw(width, height, pixels) {
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Ok(image)
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} else {
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Err(::image::error::ImageError::Limits(
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::image::error::LimitError::from_kind(
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::image::error::LimitErrorKind::DimensionError,
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),
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))
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}
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}
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