bendns' repos / pattypan
small software-rendered rust tty
Diffstat (limited to 'src/render.rs')
-rw-r--r--src/render.rs125
1 files changed, 125 insertions, 0 deletions
diff --git a/src/render.rs b/src/render.rs
new file mode 100644
index 0000000..2e9780c
--- /dev/null
+++ b/src/render.rs
@@ -0,0 +1,125 @@
+use std::sync::LazyLock;
+
+use swash::FontRef;
+use swash::scale::{Render, ScaleContext, Source};
+use swash::zeno::Format;
+
+#[implicit_fn::implicit_fn]
+pub fn render(
+ x: &super::Terminal,
+ (w, h): (usize, usize),
+ ppem: f32,
+) -> Image<Vec<u8>, 3> {
+ let m = FONT.metrics(&[]);
+ let sz = ppem * (m.max_width / m.units_per_em as f32);
+ let mut i = Image::alloc(w as _, h as _);
+ for (col, k) in x.cells.chunks_exact(x.size.0 as _).zip(0..) {
+ for (cell, j) in
+ col.iter().skip(2).zip(0..).filter(_.0.letter.is_some())
+ {
+ let id = FONT.charmap().map(cell.letter.unwrap());
+
+ let x = Render::new(&[Source::Outline])
+ .format(Format::Alpha)
+ .render(
+ &mut ScaleContext::new()
+ .builder(*FONT)
+ .size(ppem)
+ .build(),
+ id,
+ )
+ .unwrap();
+ unsafe {
+ if x.placement.width == 0 {
+ continue;
+ }
+ i.as_mut().overlay_at(
+ &Image::<Box<[u8]>, 4>::from(
+ Image::<_, 1>::build(
+ x.placement.width,
+ x.placement.height,
+ )
+ .buf(&*x.data),
+ )
+ .as_ref(),
+ 4 + ((j * sz as i32) + x.placement.left) as u32,
+ (k as f32 * (ppem * 1.25)) as u32
+ - x.placement.top as u32,
+ // x.placement.height - x.placement.top as u32,
+ );
+ }
+ }
+ }
+ i
+}
+
+pub fn dims(font: &FontRef, ppem: f32) -> (f32, f32) {
+ let m = font.metrics(&[]);
+ (ppem * (m.max_width / m.units_per_em as f32), ppem)
+}
+
+pub static FONT: LazyLock<FontRef<'static>> = LazyLock::new(|| {
+ FontRef::from_index(&include_bytes!("../CascadiaCodeNF.ttf")[..], 0)
+ .unwrap()
+});
+
+use fimg::{Image, OverlayAt};
+// let x = b"echo -e \"\x1b(0lqqqk\nx \x1b(Bx\nmqqqj";
+// let x = String::from_utf8_lossy(&x);
+// println!("{}", x);
+#[test]
+fn t() {
+ let f =
+ FontRef::from_index(&include_bytes!("../CascadiaCode.ttf")[..], 0)
+ .unwrap();
+
+ dbg!(f.attributes());
+ let m = f.metrics(&[]);
+ dbg!(m);
+ let ppem = 30.0;
+ let sz = ppem * (m.max_width / m.units_per_em as f32);
+ dbg!(
+ &mut ScaleContext::new()
+ .builder(f)
+ .size(15.0)
+ .build()
+ .scale_outline(f.charmap().map('a'))
+ .unwrap()
+ .len()
+ );
+ let mut grid = Image::<_, 4>::alloc(2000, 150);
+ unsafe { grid.chunked_mut().for_each(|x| *x = [0, 0, 0, 255]) };
+ for (letter, i) in "the quick brown fox jumped over the lazy dog"
+ .chars()
+ .zip(0..)
+ {
+ let id = f.charmap().map(letter);
+
+ let x = Render::new(&[Source::Outline])
+ .format(Format::Alpha)
+ .render(
+ &mut ScaleContext::new().builder(f).size(ppem).build(),
+ id,
+ )
+ .unwrap();
+ unsafe {
+ if x.placement.width == 0 {
+ continue;
+ }
+ grid.as_mut().overlay_at(
+ &Image::<Box<[u8]>, 4>::from(
+ Image::<_, 1>::build(
+ x.placement.width,
+ x.placement.height,
+ )
+ .buf(&*x.data),
+ )
+ .as_ref(),
+ ((i * sz as i32) + x.placement.left) as _,
+ ppem as u32 - x.placement.top as u32,
+ // x.placement.height - x.placement.top as u32,
+ );
+ }
+ }
+ grid.show();
+}