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use std::sync::Arc;
use resvg;
use usvg::Tree;
use crate::piet::{ImageBuf, ImageFormat, InterpolationMode};
use crate::widget::prelude::*;
use crate::{Rect, ScaledArea};
pub struct Svg {
tree: Arc<Tree>,
default_size: Size,
cached: Option<ImageBuf>,
}
impl Svg {
pub fn new(tree: impl Into<Arc<Tree>>) -> Self {
let tree = tree.into();
Svg {
default_size: Size::new(tree.size.width(), tree.size.height()),
cached: None,
tree,
}
}
fn render(&self, size_px: Size) -> Option<ImageBuf> {
let fit = usvg::FitTo::Size(size_px.width as u32, size_px.height as u32);
let mut pixmap =
tiny_skia::Pixmap::new(size_px.width as u32, size_px.height as u32).unwrap();
if resvg::render(
&self.tree,
fit,
tiny_skia::Transform::identity(),
pixmap.as_mut(),
)
.is_none()
{
tracing::error!("unable to render svg");
return None;
}
Some(ImageBuf::from_raw(
pixmap.data(),
ImageFormat::RgbaPremul,
size_px.width as usize,
size_px.height as usize,
))
}
}
impl<T: Data> Widget<T> for Svg {
fn event(&mut self, _ctx: &mut EventCtx, _event: &Event, _data: &mut T, _env: &Env) {}
fn lifecycle(&mut self, _ctx: &mut LifeCycleCtx, _event: &LifeCycle, _data: &T, _env: &Env) {}
fn update(&mut self, _ctx: &mut UpdateCtx, _old_data: &T, _data: &T, _env: &Env) {}
fn layout(
&mut self,
_layout_ctx: &mut LayoutCtx,
bc: &BoxConstraints,
_data: &T,
_env: &Env,
) -> Size {
let size = self.default_size;
bc.constrain_aspect_ratio(size.height / size.width, size.width)
}
fn paint(&mut self, ctx: &mut PaintCtx, _data: &T, _env: &Env) {
let size = ctx.size();
let area = ScaledArea::from_dp(size, ctx.scale());
let size_px = area.size_px();
let needs_render = self
.cached
.as_ref()
.filter(|image_buf| image_buf.size() == size_px)
.is_none();
if needs_render {
self.cached = self.render(size_px);
}
if self.cached.is_none() {
tracing::error!("unable to paint SVG due to no rendered image");
return;
}
let clip_rect = Rect::ZERO.with_size(size);
let img = self.cached.as_ref().unwrap().to_image(ctx.render_ctx);
ctx.clip(clip_rect);
ctx.draw_image(&img, clip_rect, InterpolationMode::NearestNeighbor);
}
}
#[derive(Clone, Data)]
pub struct SvgData {
tree: Arc<Tree>,
}
impl SvgData {
fn new(tree: Arc<Tree>) -> Self {
Self { tree }
}
pub fn empty() -> Self {
use std::str::FromStr;
let empty_svg = r###"
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 20 20">
<g fill="none">
</g>
</svg>
"###;
SvgData::from_str(empty_svg).unwrap()
}
}
impl std::str::FromStr for SvgData {
type Err = Box<dyn std::error::Error>;
fn from_str(svg_str: &str) -> Result<Self, Self::Err> {
let re_opt = usvg::Options {
keep_named_groups: false,
..usvg::Options::default()
};
match Tree::from_str(svg_str, &re_opt.to_ref()) {
Ok(tree) => Ok(SvgData::new(Arc::new(tree))),
Err(err) => Err(err.into()),
}
}
}
impl From<SvgData> for Arc<Tree> {
fn from(d: SvgData) -> Self {
d.tree
}
}
impl Default for SvgData {
fn default() -> Self {
SvgData::empty()
}
}