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feat: adapt white/black entity colors to background luminance

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White entities on light backgrounds (e.g. paper space) render as black;
black entities on dark backgrounds (e.g. model space) render as white.
All other colors pass through unchanged.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
Hakan 2026-04-30 10:00:46 +03:00
commit d06db45950
2 changed files with 27 additions and 3 deletions
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20
src/scene/render.rs
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@ -161,7 +161,9 @@ impl shader::Primitive for Primitive {
impl Scene {
/// Returns (entity_color, pattern_length, pattern, line_weight_px, aci).
pub(super) fn render_style(&self, e: &EntityType) -> ([f32; 4], f32, [f32; 8], f32, u8) {
render_style_for(&self.document, e)
let (color, pl, pat, lw, aci) = render_style_for(&self.document, e);
let bg = if self.current_layout == "Model" { self.bg_color } else { self.paper_bg_color };
(adapt_to_bg(color, bg), pl, pat, lw, aci)
}
}
@ -269,6 +271,22 @@ pub(super) fn render_style_for_block_sub(
(final_color, final_pat_len, final_pat, final_lw, aci)
}
/// Adapt white→black or black→white based on background luminance.
/// White entities on light backgrounds become black, black entities on dark
/// backgrounds become white. All other colors pass through unchanged.
pub(super) fn adapt_to_bg(color: [f32; 4], bg: [f32; 4]) -> [f32; 4] {
let lum = 0.299 * bg[0] + 0.587 * bg[1] + 0.114 * bg[2];
let is_white = color[0] > 0.95 && color[1] > 0.95 && color[2] > 0.95;
let is_black = color[0] < 0.05 && color[1] < 0.05 && color[2] < 0.05;
if is_white && lum > 0.5 {
[0.0, 0.0, 0.0, color[3]]
} else if is_black && lum <= 0.5 {
[1.0, 1.0, 1.0, color[3]]
} else {
color
}
}
// ── Primitive builder helpers (called by ViewportPane's shader::Program impl) ──
impl Scene {