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|
use crate::image::atlas::{self, Atlas};
use iced_native::image;
use std::collections::{HashMap, HashSet};
#[derive(Debug)]
pub enum Memory {
Host(::image_rs::ImageBuffer<::image_rs::Bgra<u8>, Vec<u8>>),
Device(atlas::Entry),
NotFound,
Invalid,
}
impl Memory {
pub fn dimensions(&self) -> (u32, u32) {
match self {
Memory::Host(image) => image.dimensions(),
Memory::Device(entry) => entry.size(),
Memory::NotFound => (1, 1),
Memory::Invalid => (1, 1),
}
}
}
#[derive(Debug)]
pub struct Cache {
map: HashMap<u64, Memory>,
hits: HashSet<u64>,
}
impl Cache {
pub fn new() -> Self {
Self {
map: HashMap::new(),
hits: HashSet::new(),
}
}
pub fn load(&mut self, handle: &image::Handle) -> &mut Memory {
if self.contains(handle) {
return self.get(handle).unwrap();
}
let memory = match handle.data() {
image::Data::Path(path) => {
if let Ok(image) = ::image_rs::open(path) {
let orientation = std::fs::File::open(path)
.ok()
.map(std::io::BufReader::new)
.and_then(|mut reader| {
Orientation::from_exif(&mut reader).ok()
})
.unwrap_or(Orientation::Default);
Memory::Host(orientation.apply(image.to_bgra8()))
} else {
Memory::NotFound
}
}
image::Data::Bytes(bytes) => {
if let Ok(image) = ::image_rs::load_from_memory(&bytes) {
let orientation = Orientation::from_exif(
&mut std::io::Cursor::new(bytes),
)
.unwrap_or(Orientation::Default);
Memory::Host(orientation.apply(image.to_bgra8()))
} else {
Memory::Invalid
}
}
image::Data::Pixels {
width,
height,
pixels,
} => {
if let Some(image) = ::image_rs::ImageBuffer::from_vec(
*width,
*height,
pixels.to_vec(),
) {
Memory::Host(image)
} else {
Memory::Invalid
}
}
};
self.insert(handle, memory);
self.get(handle).unwrap()
}
pub fn upload(
&mut self,
handle: &image::Handle,
device: &wgpu::Device,
encoder: &mut wgpu::CommandEncoder,
atlas: &mut Atlas,
) -> Option<&atlas::Entry> {
let memory = self.load(handle);
if let Memory::Host(image) = memory {
let (width, height) = image.dimensions();
let entry = atlas.upload(width, height, &image, device, encoder)?;
*memory = Memory::Device(entry);
}
if let Memory::Device(allocation) = memory {
Some(allocation)
} else {
None
}
}
pub fn trim(&mut self, atlas: &mut Atlas) {
let hits = &self.hits;
self.map.retain(|k, memory| {
let retain = hits.contains(k);
if !retain {
if let Memory::Device(entry) = memory {
atlas.remove(entry);
}
}
retain
});
self.hits.clear();
}
fn get(&mut self, handle: &image::Handle) -> Option<&mut Memory> {
let _ = self.hits.insert(handle.id());
self.map.get_mut(&handle.id())
}
fn insert(&mut self, handle: &image::Handle, memory: Memory) {
let _ = self.map.insert(handle.id(), memory);
}
fn contains(&self, handle: &image::Handle) -> bool {
self.map.contains_key(&handle.id())
}
}
#[derive(Debug, Clone, Copy)]
enum Orientation {
Default,
FlippedHorizontally,
FlippedVertically,
Rotated90,
Rotated180,
Rotated270,
Rotated90AndFlippedHorizontally,
Rotated90AndFlippedVertically,
}
impl Orientation {
// Meaning of the returned value is described e.g. at:
// https://magnushoff.com/articles/jpeg-orientation/
fn from_exif<R>(reader: &mut R) -> Result<Self, exif::Error>
where
R: std::io::BufRead + std::io::Seek,
{
let exif = ::exif::Reader::new().read_from_container(reader)?;
Ok(exif
.get_field(::exif::Tag::Orientation, ::exif::In::PRIMARY)
.and_then(|field| field.value.get_uint(0))
.map(|value| match value {
2 => Orientation::FlippedHorizontally,
3 => Orientation::Rotated180,
4 => Orientation::FlippedVertically,
5 => Orientation::Rotated90AndFlippedHorizontally,
6 => Orientation::Rotated90,
7 => Orientation::Rotated90AndFlippedVertically,
8 => Orientation::Rotated270,
_ => Orientation::Default,
})
.unwrap_or(Orientation::Default))
}
fn apply(
self,
mut img: ::image_rs::ImageBuffer<::image_rs::Bgra<u8>, Vec<u8>>,
) -> ::image_rs::ImageBuffer<::image_rs::Bgra<u8>, Vec<u8>> {
use ::image_rs::imageops::*;
match self {
Self::FlippedHorizontally => flip_horizontal_in_place(&mut img),
Self::Rotated180 => rotate180_in_place(&mut img),
Self::FlippedVertically => flip_vertical_in_place(&mut img),
Self::Rotated90AndFlippedHorizontally => {
img = rotate90(&img);
flip_horizontal_in_place(&mut img);
}
Self::Rotated90 => img = rotate90(&img),
Self::Rotated90AndFlippedVertically => {
img = rotate90(&img);
flip_vertical_in_place(&mut img);
}
Self::Rotated270 => img = rotate270(&img),
Self::Default => {}
};
img
}
}
|
