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|
use crate::image::atlas::{self, Atlas};
use iced_native::image;
use std::collections::{HashMap, HashSet};
use bitflags::bitflags;
#[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 operation = std::fs::File::open(path)
.ok()
.map(std::io::BufReader::new)
.and_then(|mut reader| {
Operation::from_exif(&mut reader).ok()
})
.unwrap_or_else(Operation::empty);
Memory::Host(operation.perform(image.to_bgra8()))
} else {
Memory::NotFound
}
}
image::Data::Bytes(bytes) => {
if let Ok(image) = ::image_rs::load_from_memory(&bytes) {
let operation =
Operation::from_exif(&mut std::io::Cursor::new(bytes))
.ok()
.unwrap_or_else(Operation::empty);
Memory::Host(operation.perform(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())
}
}
bitflags! {
struct Operation: u8 {
const FLIP_HORIZONTALLY = 0b001;
const ROTATE_180 = 0b010;
const FLIP_DIAGONALLY = 0b100;
}
}
impl Operation {
// 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,
{
use std::convert::TryFrom;
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))
.and_then(|value| u8::try_from(value).ok())
.and_then(|value| Self::from_bits(value.saturating_sub(1)))
.unwrap_or_else(Self::empty))
}
fn perform<I>(self, mut image: I) -> I
where
I: image_rs::GenericImage,
{
use image_rs::imageops;
if self.contains(Self::FLIP_DIAGONALLY) {
imageops::flip_horizontal_in_place(&mut image);
imageops::flip_vertical_in_place(&mut image);
}
if self.contains(Self::ROTATE_180) {
imageops::rotate180_in_place(&mut image);
}
if self.contains(Self::FLIP_HORIZONTALLY) {
imageops::flip_horizontal_in_place(&mut image);
}
image
}
}
|
