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use base64::{self, STANDARD};
use std::fs::File;
use std::io::{self, Read};
use std::path::Path;
use std::sync::atomic::{AtomicUsize, Ordering};
static LAST_IMAGE_ID: AtomicUsize = AtomicUsize::new(0);
#[derive(Debug, Clone)]
pub struct Image {
url: String,
id: usize,
}
impl PartialEq for Image {
fn eq(&self, other: &Image) -> bool {
self.url == other.url
}
}
impl Default for Image {
fn default() -> Image {
Image::new(&[])
}
}
impl<D: AsRef<[u8]>> From<D> for Image {
fn from(d: D) -> Self {
Image::new(d.as_ref())
}
}
impl Image {
pub fn new(data: &[u8]) -> Self {
let mut image = Image {
url: String::new(),
id: 0,
};
image.modify(data);
image
}
pub fn from_file<P, B>(path: P, mut buf: B) -> io::Result<Image>
where
P: AsRef<Path>,
B: AsMut<Vec<u8>>,
{
let mut file = File::open(path)?;
let len = file.metadata()?.len() as usize;
let buf = buf.as_mut();
buf.clear();
buf.reserve(len);
unsafe {
buf.set_len(len);
}
file.read_exact(buf).map_err(|e| {
unsafe { buf.set_len(0) };
e
})?;
Ok(Image::new(buf))
}
#[inline]
pub fn id(&self) -> usize {
self.id
}
#[inline]
pub fn url(&self) -> &str {
&self.url
}
pub fn modify(&mut self, data: &[u8]) {
#[cfg(feature = "image-shrinking")]
let data = {
use crate::image_shrinking::shrink;
const MAX_IMAGE_SIZE: u32 = 128;
shrink(data, MAX_IMAGE_SIZE)
};
self.id = LAST_IMAGE_ID.fetch_add(1, Ordering::SeqCst);
self.url.clear();
if !data.is_empty() {
self.url.push_str("data:;base64,");
base64::encode_config_buf(&data, STANDARD, &mut self.url);
}
}
pub fn is_empty(&self) -> bool {
self.url.is_empty()
}
}
#[derive(Copy, Clone, PartialEq)]
pub enum CachedImageId {
Uncached,
NoImage,
Image(usize),
}
impl Default for CachedImageId {
fn default() -> Self {
CachedImageId::Uncached
}
}
impl CachedImageId {
pub fn update_with<'i>(&mut self, image: Option<&'i Image>) -> Option<&'i str> {
let new_value = image.map_or(CachedImageId::NoImage, |i| {
if i.is_empty() {
CachedImageId::NoImage
} else {
CachedImageId::Image(i.id())
}
});
if *self != new_value {
*self = new_value;
Some(image.map_or("", |i| i.url()))
} else {
None
}
}
pub fn reset(&mut self) {
*self = CachedImageId::Uncached;
}
}