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|
use crate::core::image as raster;
use crate::core::{Rectangle, Size};
use crate::graphics;
use rustc_hash::{FxHashMap, FxHashSet};
use std::cell::RefCell;
use std::collections::hash_map;
pub struct Pipeline {
cache: RefCell<Cache>,
}
impl Pipeline {
pub fn new() -> Self {
Self {
cache: RefCell::new(Cache::default()),
}
}
pub fn dimensions(&self, handle: &raster::Handle) -> Size<u32> {
if let Some(image) = self.cache.borrow_mut().allocate(handle) {
Size::new(image.width(), image.height())
} else {
Size::new(0, 0)
}
}
pub fn draw(
&mut self,
handle: &raster::Handle,
bounds: Rectangle,
pixels: &mut tiny_skia::PixmapMut<'_>,
transform: tiny_skia::Transform,
clip_mask: Option<&tiny_skia::Mask>,
) {
if let Some(image) = self.cache.borrow_mut().allocate(handle) {
let width_scale = bounds.width / image.width() as f32;
let height_scale = bounds.height / image.height() as f32;
let transform = transform.pre_scale(width_scale, height_scale);
pixels.draw_pixmap(
(bounds.x / width_scale) as i32,
(bounds.y / height_scale) as i32,
image,
&tiny_skia::PixmapPaint {
quality: tiny_skia::FilterQuality::Bilinear,
..Default::default()
},
transform,
clip_mask,
);
}
}
pub fn trim_cache(&mut self) {
self.cache.borrow_mut().trim();
}
}
#[derive(Default)]
struct Cache {
entries: FxHashMap<u64, Option<Entry>>,
hits: FxHashSet<u64>,
}
impl Cache {
pub fn allocate(
&mut self,
handle: &raster::Handle,
) -> Option<tiny_skia::PixmapRef<'_>> {
let id = handle.id();
if let hash_map::Entry::Vacant(entry) = self.entries.entry(id) {
let image = graphics::image::load(handle).ok()?.into_rgba8();
let mut buffer =
vec![0u32; image.width() as usize * image.height() as usize];
for (i, pixel) in image.pixels().enumerate() {
let [r, g, b, a] = pixel.0;
buffer[i] = bytemuck::cast(
tiny_skia::ColorU8::from_rgba(b, g, r, a).premultiply(),
);
}
let _ = entry.insert(Some(Entry {
width: image.width(),
height: image.height(),
pixels: buffer,
}));
}
let _ = self.hits.insert(id);
self.entries.get(&id).unwrap().as_ref().map(|entry| {
tiny_skia::PixmapRef::from_bytes(
bytemuck::cast_slice(&entry.pixels),
entry.width,
entry.height,
)
.expect("Build pixmap from image bytes")
})
}
fn trim(&mut self) {
self.entries.retain(|key, _| self.hits.contains(key));
self.hits.clear();
}
}
struct Entry {
width: u32,
height: u32,
pixels: Vec<u32>,
}
|
