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use crate::config::CONFIG_INSTANCE;
use crate::constants::{PHOTO_BASE_XY, PHOTO_FULLSIZE_XY, PHOTO_THUMBNAIL_XY};
use crate::error::DichroismError;
use crate::models::{Photo, PhotoSet};
use exif::Reader;
use image::imageops::FilterType;
use image::DynamicImage;
use image::GenericImageView;
use std::io::{BufReader, Cursor};
use std::path::PathBuf;
use uuid::Uuid;
pub fn generate_photo_set(data: Vec<u8>) -> Result<PhotoSet, DichroismError> {
// load image data from bytes
let mut original = image::load_from_memory(&data)?;
// read EXIF tags to check for required rotation
let exifreader = Reader::new();
let mut reader = BufReader::new(Cursor::new(data));
let exif = exifreader.read_from_container(&mut reader).unwrap();
if let Some(orient) = exif
.get_field(exif::Tag::Orientation, exif::In::PRIMARY)
.map(|o| o.value.get_uint(0))
.flatten()
{
// if a tag was present, rotate original image data as necessary
match orient {
8 => original = original.rotate270(),
3 => original = original.rotate180(),
6 => original = original.rotate90(),
_ => {}
}
}
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(PhotoSet {
id: None,
original: generate_photo(&original)?,
fullsize: generate_photo(&fullsize)?,
base: generate_photo(&base)?,
thumbnail: generate_photo(&thumbnail)?,
})
}
fn generate_photo(image: &DynamicImage) -> Result<Photo, DichroismError> {
let base_name = Uuid::new_v3(&Uuid::NAMESPACE_OID, &image.to_bytes())
.to_hyphenated()
.to_string();
let mut path = PathBuf::from(&CONFIG_INSTANCE.img_root);
path.push(base_name);
path.set_extension("jpg");
image.save(&path)?;
let id = path
.file_name()
.ok_or_else(|| {
DichroismError::ImageWrite("Error extracting filename from path".to_string())
})?
.to_str()
.ok_or_else(|| {
DichroismError::ImageWrite("Error converting filename to slice".to_string())
})?;
Ok(Photo::new(String::from(id)))
}
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