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|
//! Raster image loading and caching
use iced_native::image;
use std::collections::{HashMap, HashSet};
use bitflags::bitflags;
use super::{TextureStore, TextureStoreEntry};
/// Entry in cache corresponding to an image handle
#[derive(Debug)]
pub enum Memory<T: TextureStore> {
/// Image data on host
Host(::image_rs::ImageBuffer<::image_rs::Rgba<u8>, Vec<u8>>),
/// Texture store entry
Device(T::Entry),
/// Image not found
NotFound,
/// Invalid image data
Invalid,
}
impl<T: TextureStore> Memory<T> {
/// Width and height of image
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),
}
}
}
/// Caches image raster data
#[derive(Debug)]
pub struct Cache<T: TextureStore> {
map: HashMap<u64, Memory<T>>,
hits: HashSet<u64>,
}
impl<T: TextureStore> Cache<T> {
/// Load image
pub fn load(&mut self, handle: &image::Handle) -> &mut Memory<T> {
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_rgba8()))
} 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_rgba8()))
} 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()
}
/// Load image and upload raster data
pub fn upload(
&mut self,
handle: &image::Handle,
state: &mut T::State<'_>,
store: &mut T,
) -> Option<&T::Entry> {
let memory = self.load(handle);
if let Memory::Host(image) = memory {
let (width, height) = image.dimensions();
let entry = store.upload(width, height, image, state)?;
*memory = Memory::Device(entry);
}
if let Memory::Device(allocation) = memory {
Some(allocation)
} else {
None
}
}
/// Trim cache misses from cache
pub fn trim(&mut self, store: &mut T, state: &mut T::State<'_>) {
let hits = &self.hits;
self.map.retain(|k, memory| {
let retain = hits.contains(k);
if !retain {
if let Memory::Device(entry) = memory {
store.remove(entry, state);
}
}
retain
});
self.hits.clear();
}
fn get(&mut self, handle: &image::Handle) -> Option<&mut Memory<T>> {
let _ = self.hits.insert(handle.id());
self.map.get_mut(&handle.id())
}
fn insert(&mut self, handle: &image::Handle, memory: Memory<T>) {
let _ = self.map.insert(handle.id(), memory);
}
fn contains(&self, handle: &image::Handle) -> bool {
self.map.contains_key(&handle.id())
}
}
impl<T: TextureStore> Default for Cache<T> {
fn default() -> Self {
Self {
map: HashMap::new(),
hits: HashSet::new(),
}
}
}
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,
{
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<P>(
self,
image: image_rs::ImageBuffer<P, Vec<P::Subpixel>>,
) -> image_rs::ImageBuffer<P, Vec<P::Subpixel>>
where
P: image_rs::Pixel + 'static,
{
use image_rs::imageops;
let mut image = if self.contains(Self::FLIP_DIAGONALLY) {
flip_diagonally(image)
} else {
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
}
}
fn flip_diagonally<I>(
image: I,
) -> image_rs::ImageBuffer<I::Pixel, Vec<<I::Pixel as image_rs::Pixel>::Subpixel>>
where
I: image_rs::GenericImage,
I::Pixel: 'static,
{
let (width, height) = image.dimensions();
let mut out = image_rs::ImageBuffer::new(height, width);
for x in 0..width {
for y in 0..height {
let p = image.get_pixel(x, y);
out.put_pixel(y, x, p);
}
}
out
}
|
