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⚡ Bolt: Optimize recursive string allocations in canvas SVG rendering #181

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Merged
Tcode-Motion merged 1 commit into from
Sep 19, 2026
Merged

⚡ Bolt: Optimize recursive string allocations in canvas SVG rendering #181

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14 changes: 9 additions & 5 deletions stdlib/src/canvas.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -15,10 +15,9 @@ use techscript_runtime::{
};

/// Convert a DslBlockValue to SVG string.
fn dsl_to_svg(val: &RuntimeValue, is_dragon: bool) -> String {
fn render_dsl_to_svg(svg: &mut String, val: &RuntimeValue, is_dragon: bool) {
match val {
RuntimeValue::DslBlock(dsl) => {
let mut svg = String::new();
if is_dragon {
match dsl.kind.as_str() {
"logo" => {
Expand Down Expand Up @@ -249,12 +248,17 @@ fn dsl_to_svg(val: &RuntimeValue, is_dragon: bool) -> String {
_ => {}
}
}
svg
}
_ => String::new(),
_ => {}
}
}

fn dsl_to_svg(val: &RuntimeValue, is_dragon: bool) -> String {
let mut svg = String::new();
render_dsl_to_svg(&mut svg, val, is_dragon);
svg
}

struct CanvasFn {
name: String,
min_arity: usize,
Expand Down Expand Up @@ -684,7 +688,7 @@ impl StdlibRegistry {
<rect width="100%" height="100%" fill="{}"/>
"##, bg_color);
for block in &blocks {
svg.push_str(&dsl_to_svg(block, is_dragon));
render_dsl_to_svg(&mut svg, block, is_dragon);
}
svg.push_str("</svg>");
Ok(RuntimeValue::Str(svg))
Expand Down
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