95 lines
2.8 KiB
Rust
95 lines
2.8 KiB
Rust
//! Load and operate on images.
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use crate::core::image::{Data, Handle};
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use bitflags::bitflags;
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pub use ::image as image_rs;
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/// Tries to load an image by its [`Handle`].
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pub fn load(handle: &Handle) -> image_rs::ImageResult<image_rs::DynamicImage> {
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match handle.data() {
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Data::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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Ok(operation.perform(image))
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}
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Data::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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Ok(operation.perform(image))
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}
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Data::Rgba {
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width,
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height,
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pixels,
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} => {
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if let Some(image) = image_rs::ImageBuffer::from_vec(
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*width,
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*height,
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pixels.to_vec(),
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) {
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Ok(image_rs::DynamicImage::ImageRgba8(image))
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} else {
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Err(image_rs::error::ImageError::Limits(
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image_rs::error::LimitError::from_kind(
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image_rs::error::LimitErrorKind::DimensionError,
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),
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))
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}
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}
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}
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}
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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(self, mut image: image::DynamicImage) -> 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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