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Brandon ThomasandClaude Opus 5.5
275cbcf323
LaTeX `animate` PDFs store each frame as a read-only push button and drive them from a Screen annotation. PdfCraft showed "This document contains N interactive form fields." because the bar counted any field, and listed the Screen annotation in the Comments panel because only Link, Widget and Popup were filtered out. - The form-fields bar now needs at least one field that isn't a push button (something to fill in). - Non-markup annotations (ISO 32000-2 §12.5.6: Screen, Movie, RichMedia, 3D, PrinterMark, TrapNet, Watermark) are no longer comments, both when a document is inspected and when the comment list is rebuilt after an edit (new pdfcraft_annot::is_comment_subtype). Playing the animation itself (page actions, timers) is out of scope here. Co-authored-by: Claude Opus 5.5 <[email protected]>
pdfcraft-annot
Comments (annotations), ISO 32000-2 §12.5. Layer L3, depends on pdfcraft-cos, pdfcraft-fonts and pdfcraft-model.
What it does
- Builders for the comment types Acrobat's commenting tools create: sticky note (
Text+Popup), highlight, underline, strikethrough, squiggly, rectangle (Square), oval (Circle), line and arrow (Linewith/LE), freehand drawing (Ink) and text box (FreeText). - Appearance streams (
appearance::build) generated from the annotation dictionary, so new and restyled comments look the same in every viewer. Highlights multiply (/BM /Multiply). Note icons are PdfCraft's own drawings. Text boxes use standard Helvetica (WinAnsi), with line breaking by approximate Helvetica proportions (no font program is bundled). - Edits: reply (
/IRT), set review status (a/Statereply, as Acrobat's "Set status" does), change text, move, resize, restyle, delete (with pop-up and replies).
API sketch
let index = add_annotation(&mut doc, &NewAnnotation { page, shape, style, contents, author }, &meta)?;
add_reply(&mut doc, page, index, "Agreed", "Ada", &meta)?;
set_review_state(&mut doc, page, index, ReviewState::Accepted, "Ada", &meta)?;
move_annotation(&mut doc, page, index, dx, dy, &meta)?;
set_style(&mut doc, page, index, Some(rgb), Some(0.5), Some(2.0), &meta)?;
delete_annotation(&mut doc, page, index)?;
signature_image(&doc, page, index)?; // embedded image XObject of Fill & Sign signature/initials
A comment is addressed by (page, index in /Annots), the same pair
pdfcraft_render::Annotation reports. Meta carries the date and the /NM id so edits stay
deterministic; the engine supplies them.
Fidelity rules
- Unknown keys are kept. Inline annotation dictionaries are promoted to indirect objects only when an edit needs a reference to them.
set_stylerefuses (and changes nothing) when it cannot redraw the comment, e.g. stamps, cloudy borders or callouts, instead of leaving a stale appearance.- Replies get the parent's
/Rectand an empty appearance: they appear in comment lists but never paint a second icon. - Resizing a stamp changes its
/Rectand preserves its original appearance and resources; viewers scale that appearance into the new rectangle. Locked stamps refuse the edit. - Natural-size image stamps placed by the engine counterrotate their appearance on rotated pages. Image restyling retains that appearance matrix. Explicit rectangles, image signatures and PDF-page stamps still use their existing placement behavior; page-rotation support for those paths is not complete.
Not yet
Callouts, polygons and polylines, clouds, carets (insert/replace text), stamps, file
attachments, rich text (/RC, /DS), and the shared named-appearance cache Acrobat writes.