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bflatasticandClaude Opus 5.5
1e7f5084d8
Effect › Blur › Radial Blur (spin/zoom, draft/good/best) and Smart Blur (Normal mode), Effect › Sharpen › Unsharp Mask: Photoshop-style filters in vectorcraft_effects::pixel, run by the renderer on the object's pixels in stack order with Gaussian Blur and Feather, cached while panning; lengths in points, bounded work per pixel. PDF, Expand Appearance and SVG export write the effected objects as images. Dialogs with preview (method/quality dropdowns, fields in documented order), menu entries, translations, tests. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
32 lines
1.2 KiB
Rust
32 lines
1.2 KiB
Rust
//! Sharpen › Unsharp Mask.
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use super::{gaussian, to16};
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/// Unsharp Mask: each colour channel pushed away from a Gaussian blur of the pixels (σ = `sigma`
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/// pixels) by `amount` times their difference, where that difference reaches `threshold` levels.
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/// The blur is premultiplied, so edges against transparency don't darken; coverage stays as it is.
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pub(super) fn unsharp(px: &mut [[u8; 4]], w: usize, h: usize, amount: f64, sigma: f64, threshold: f64) {
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if sigma.is_nan() || sigma < 0.2 || amount.is_nan() || amount <= 0.0 || h == 0 {
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return;
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}
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let mut blurred = to16(px);
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gaussian(&mut blurred, w, sigma);
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let (amount, threshold) = (amount as f32, threshold as f32);
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for (p, b) in px.iter_mut().zip(&blurred) {
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let a = p[3] as f32;
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if a == 0.0 {
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continue;
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}
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for i in 0..3 {
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let own = p[i] as f32 * 255.0 / a;
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let around = if b[3] > 0 { b[i] as f32 * 255.0 / b[3] as f32 } else { own };
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let diff = own - around;
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if diff.abs() < threshold || diff == 0.0 {
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continue;
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}
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let v = (own + amount * diff).clamp(0.0, 255.0);
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p[i] = (v * a / 255.0).round().clamp(0.0, 255.0) as u8;
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}
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}
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}
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