bendns' repos / psvg
the aliasing svg renderer
Diffstat (limited to 'src/render.rs')
-rw-r--r--src/render.rs62
1 files changed, 62 insertions, 0 deletions
diff --git a/src/render.rs b/src/render.rs
new file mode 100644
index 0000000..705a8ce
--- /dev/null
+++ b/src/render.rs
@@ -0,0 +1,62 @@
+use crate::tree::{Node, PathNode, Tree};
+use fimg::Image;
+use tiny_skia_path::{NormalizedF32, Path, Point};
+use usvg::Color;
+
+impl Tree {
+ #[must_use]
+ pub fn render(&self) -> Image<Box<[u8]>, 4> {
+ let mut canvas =
+ Image::alloc(self.width.round() as u32, self.height.round() as u32).boxed();
+ for node in &*self.children {
+ render(node, &mut canvas);
+ }
+ canvas
+ }
+}
+
+trait Col {
+ fn col(self, opacity: NormalizedF32) -> [u8; 4];
+}
+impl Col for Color {
+ fn col(self, opacity: NormalizedF32) -> [u8; 4] {
+ [self.red, self.green, self.blue, opacity.to_u8()]
+ }
+}
+
+fn point(p: &Path) -> Vec<(i32, i32)> {
+ let mut points = Vec::with_capacity(p.len() + 1);
+ let r = |p: Point| (p.x.round() as i32, p.y.round() as i32);
+ for &point in p.points() {
+ points.push(r(point));
+ }
+ points.push(r(*p.points().first().unwrap()));
+ points
+}
+
+fn render(node: &Node, img: &mut Image<Box<[u8]>, 4>) {
+ match node {
+ Node::Path(PathNode::Fill {
+ color,
+ opacity,
+ path,
+ }) => {
+ img.points(&point(path), color.col(*opacity));
+ }
+ Node::Path(PathNode::Stroke {
+ color,
+ opacity,
+ path,
+ ..
+ // TODO: stroek
+ }) => img.points(&point(path), color.col(*opacity)),
+ Node::Group {
+ ..
+ } => {
+ // for child in &**children {
+ // render(child, img);
+ // }
+ }
+ t => unimplemented!("{t:?}"),
+ }
+}