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33 lines
1.7 KiB
Markdown
33 lines
1.7 KiB
Markdown
# printcraft-print
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Layer L4: printing (execution plan M10.5).
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```rust
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let pages = select_pages(count, Some("1-3, ii, 9-"), &labels, Subset::All, false)?;
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let settings = Settings { pages, paper: PAPERS[0].1, layout: Layout::multiple(4), ..Default::default() };
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let sheets = layout(&display_sizes, &settings)?; // geometry only (previews)
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let pdf = impose(&doc, &settings)?; // the print-ready PDF
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spool::submit(&pdf, &spool::Job { printer: None, copies: 2, ..Default::default() })?;
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```
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- **Size**: fit (to the sheet minus an 18 pt margin), actual size, shrink oversized, custom %;
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centred; auto orientation turns the sheet for landscape pages.
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- **Multiple**: 2/4/6/9/16 (or any n) pages per sheet, horizontal/vertical (reversed) order,
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page borders, auto-rotation of pages that don't match the cell.
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- **Booklet**: saddle-stitch imposition padded to a multiple of 4; both sides, front or back
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only; left or right binding.
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- **Poster**: tile scale, overlap shared by neighbouring tiles, cut marks.
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- **Comments & forms**: document, + markups, + stamps, or form fields only; annotations print
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only with their Print flag, drawn from their appearance streams (Algorithm 8.1).
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Each source page becomes a Form XObject (its content wrapped in q/Q, plus the printable
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annotations); sheets place them with a clip. The result is a fresh, unencrypted,
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garbage-collected file (callers check the print permission).
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`spool` talks to CUPS (`lpstat -p -d`, `lp` with copies, collation, duplex and monochrome
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options). Other platforms report that printing to a printer isn't available yet; the
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print-ready PDF can always be saved.
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Not yet: Windows and web spoolers, print as image, poster labels, PostScript output, colour
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conversion for grayscale.
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