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use super::photo::Photo;
use crate::constants::{PHOTO_BASE_XY, PHOTO_FULLSIZE_XY, PHOTO_THUMBNAIL_XY};
use crate::error::DichroismError;
use crate::result::Result;
use base64::decode;
use image::imageops::FilterType;
use image::GenericImageView;
use once_cell::sync::Lazy;
use regex::Regex;
static DATA_URI_RE: Lazy<Regex> = Lazy::new(|| {
Regex::new("^data:image/(png|jpeg);base64,(?P<data>.+)")
.expect("Couldn't parse data URI Regex.")
});
pub struct PhotoSet {
pub original: Photo, // original, just for safe-keeping
pub fullsize: Photo, // full-size, "zoomed" view
pub base: Photo, // basic viewing
pub thumbnail: Photo, // tiny, square thumbnail
}
impl PhotoSet {
pub fn from_photos(original: Photo, fullsize: Photo, base: Photo, thumbnail: Photo) -> Self {
Self {
original,
fullsize,
base,
thumbnail,
}
}
pub fn from_data_uri(uri: &str) -> Result<Self> {
let data = DATA_URI_RE
.captures(uri)
.ok_or(DichroismError::UriDataExtract)?
.name("data")
.ok_or(DichroismError::UriDataExtract)?
.as_str();
let original = image::load_from_memory(&decode(data)?)?;
let fullsize = original.resize(PHOTO_FULLSIZE_XY, PHOTO_FULLSIZE_XY, FilterType::Lanczos3);
let base = original.resize(PHOTO_BASE_XY, PHOTO_BASE_XY, FilterType::Lanczos3);
let (width, height) = original.dimensions();
let thumbnail = if width > height {
let offset = (width - height) / 2;
original.crop_imm(offset, 0, width - offset * 2, height)
} else {
let offset = (height - width) / 2;
original.crop_imm(0, offset, width, height - offset * 2)
}
.resize(PHOTO_THUMBNAIL_XY, PHOTO_THUMBNAIL_XY, FilterType::Lanczos3);
Ok(Self {
original: Photo::from_image(&original)?,
fullsize: Photo::from_image(&fullsize)?,
base: Photo::from_image(&base)?,
thumbnail: Photo::from_image(&thumbnail)?,
})
}
}
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