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59 lines
1.7 KiB
Rust
59 lines
1.7 KiB
Rust
use crate::error::RepoResult;
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use image::imageops::FilterType;
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use image::io::Reader as ImageReader;
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use image::{DynamicImage, ImageOutputFormat};
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use std::io::Cursor;
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use std::path::PathBuf;
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use tokio::fs::OpenOptions;
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use tokio::io::{AsyncRead, AsyncReadExt, BufReader};
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/// Represents the different sizes of a thumbnail
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#[derive(Clone, Copy)]
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pub enum ThumbnailSize {
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Small,
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Medium,
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Large,
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}
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impl ThumbnailSize {
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pub fn dimensions(&self) -> (u32, u32) {
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match self {
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ThumbnailSize::Small => (128, 128),
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ThumbnailSize::Medium => (256, 256),
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ThumbnailSize::Large => (512, 512),
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}
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}
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}
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/// Reads an image from a path
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pub async fn read_image_from_path(path: &PathBuf) -> RepoResult<DynamicImage> {
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let file = OpenOptions::new().read(true).open(path).await?;
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let mut reader = BufReader::new(file);
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read_image(&mut reader).await
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}
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/// Reads an image from a reader
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pub async fn read_image<R: AsyncRead + Unpin>(reader: &mut R) -> RepoResult<DynamicImage> {
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let mut buf = Vec::new();
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reader.read_to_end(&mut buf).await?;
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let image = ImageReader::new(Cursor::new(buf))
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.with_guessed_format()?
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.decode()?;
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Ok(image)
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}
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/// Returns the bytes of an image in the png format
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pub fn get_image_bytes_png(image: DynamicImage) -> RepoResult<Vec<u8>> {
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let mut buf = Vec::new();
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image.write_to(&mut buf, ImageOutputFormat::Png)?;
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Ok(buf)
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}
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/// Creates a thumbnail with the defined thumbnail size
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pub fn create_thumbnail(image: DynamicImage, size: ThumbnailSize) -> DynamicImage {
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let (height, width) = size.dimensions();
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image.resize(height, width, FilterType::Nearest)
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}
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