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M9: visible digital signatures can show a drawn, typed or image graphic (#193) (#934)

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* M9: visible digital signatures can show a drawn, typed or image graphic (#193)

A visible certificate signature can show a graphic where the signer's
name is large, as Acrobat's Configure Signature Appearance does: the
saved Fill & Sign signature (drawn, typed or image) or an imported
PNG/JPEG. Sign as previews it and remembers the choice; sign_document
takes `graphic` (image, text or strokes).

pdfcraft-sign gains `Graphic` and `SignOptions::graphic`. Graphics are
checked and size-capped before drawing; images keep alpha as a soft
mask and are encrypted with the rest of the update in encrypted files.

Refs #193

* Refresh catalog hashes

---------

Co-authored-by: Brandon Thomas <echelon@gmail.com>
This commit is contained in:
Justin Wilkins
2026-10-11 13:47:51 -04:00
committed by GitHub
co-authored by Brandon Thomas
parent 626724bbdd
commit 56c034b0b3
33 changed files with 804 additions and 85 deletions
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crates/annot/src/appearance.rs
+1 -1
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@@ -104,7 +104,7 @@ fn line_end(c: &mut String, kind: &[u8], tip: (f64, f64), from: (f64, f64), w: f
/// point parallel to the chord between its neighbours (an end uses itself as the missing
/// neighbour). Ink is drawn so, as Acrobat draws it, rather than as straight segments. The curve
/// stays within its points and these control points.
pub(crate) fn smooth_segments(pts: &[(f64, f64)]) -> Vec<[(f64, f64); 3]> {
pub fn smooth_segments(pts: &[(f64, f64)]) -> Vec<[(f64, f64); 3]> {
let Some(&last) = pts.last() else { return Vec::new() };
let at = |i: usize| pts.get(i).copied().unwrap_or(last);
(0..pts.len().saturating_sub(1))