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|
use crate::core::svg::{Data, Handle};
use crate::core::{Rectangle, Size};
use resvg::usvg;
use rustc_hash::{FxHashMap, FxHashSet};
use std::cell::RefCell;
use std::collections::hash_map;
use std::fs;
pub struct Pipeline {
cache: RefCell<Cache>,
}
impl Pipeline {
pub fn new() -> Self {
Self {
cache: RefCell::new(Cache::default()),
}
}
pub fn viewport_dimensions(&self, handle: &Handle) -> Size<u32> {
self.cache
.borrow_mut()
.viewport_dimensions(handle)
.unwrap_or(Size::new(0, 0))
}
pub fn draw(
&mut self,
handle: &Handle,
bounds: Rectangle,
pixels: &mut tiny_skia::PixmapMut<'_>,
clip_mask: Option<&tiny_skia::ClipMask>,
) {
if let Some(image) = self
.cache
.borrow_mut()
.draw(handle, Size::new(bounds.width as u32, bounds.height as u32))
{
pixels.draw_pixmap(
bounds.x as i32,
bounds.y as i32,
image,
&tiny_skia::PixmapPaint::default(),
tiny_skia::Transform::identity(),
clip_mask,
);
}
}
pub fn trim_cache(&mut self) {
self.cache.borrow_mut().trim();
}
}
#[derive(Default)]
struct Cache {
trees: FxHashMap<u64, Option<resvg::usvg::Tree>>,
tree_hits: FxHashSet<u64>,
rasters: FxHashMap<(u64, Size<u32>), tiny_skia::Pixmap>,
raster_hits: FxHashSet<(u64, Size<u32>)>,
}
impl Cache {
fn load(&mut self, handle: &Handle) -> Option<&usvg::Tree> {
let id = handle.id();
if let hash_map::Entry::Vacant(entry) = self.trees.entry(id) {
let svg = match handle.data() {
Data::Path(path) => {
fs::read_to_string(path).ok().and_then(|contents| {
usvg::Tree::from_str(
&contents,
&usvg::Options::default(),
)
.ok()
})
}
Data::Bytes(bytes) => {
usvg::Tree::from_data(bytes, &usvg::Options::default()).ok()
}
};
entry.insert(svg);
}
self.tree_hits.insert(id);
self.trees.get(&id).unwrap().as_ref()
}
fn viewport_dimensions(&mut self, handle: &Handle) -> Option<Size<u32>> {
let tree = self.load(handle)?;
Some(Size::new(
tree.size.width() as u32,
tree.size.height() as u32,
))
}
fn draw(
&mut self,
handle: &Handle,
size: Size<u32>,
) -> Option<tiny_skia::PixmapRef<'_>> {
if size.width == 0 || size.height == 0 {
return None;
}
let id = handle.id();
#[allow(clippy::map_entry)]
if !self.rasters.contains_key(&(id, size)) {
let tree = self.load(handle)?;
let mut image = tiny_skia::Pixmap::new(size.width, size.height)?;
resvg::render(
tree,
if size.width > size.height {
usvg::FitTo::Width(size.width)
} else {
usvg::FitTo::Height(size.height)
},
tiny_skia::Transform::default(),
image.as_mut(),
)?;
// Swap R and B channels for `softbuffer` presentation
for pixel in bytemuck::cast_slice_mut::<u8, u32>(image.data_mut()) {
*pixel = *pixel & 0xFF00FF00
| ((0x000000FF & *pixel) << 16)
| ((0x00FF0000 & *pixel) >> 16);
}
self.rasters.insert((id, size), image);
}
self.raster_hits.insert((id, size));
self.rasters.get(&(id, size)).map(tiny_skia::Pixmap::as_ref)
}
fn trim(&mut self) {
self.trees.retain(|key, _| self.tree_hits.contains(key));
self.rasters.retain(|key, _| self.raster_hits.contains(key));
self.tree_hits.clear();
self.raster_hits.clear();
}
}
|
