M13.2: PDF / Illustrator (.ai) / EPS vector footage (effectcraft-pdf): continuous rasterisation, layered composition import, Create Shapes from Vector Layer; SVG render tree clip groups

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

crates/pdf/src/write.rs

@@ -0,0 +1,32 @@
+//! A minimal PDF writer for generating test files (EffectCraft does not export PDF).
+
+/// Numbered objects `(number, dictionary, stream data)` (streams Flate-compressed), a
+/// cross-reference table and a trailer naming object `root` as the catalog.
+pub fn pdf(objects: &[(u32, String, Option<Vec<u8>>)], root: u32) -> Vec<u8> {
+    let mut out = b"%PDF-1.7\n%\xE2\xE3\xCF\xD3\n".to_vec();
+    let mut offsets = vec![];
+    for (n, dict, stream) in objects {
+        offsets.push((*n, out.len()));
+        match stream {
+            Some(data) => {
+                let z = miniz_oxide::deflate::compress_to_vec_zlib(data, 6);
+                let d = format!("{} /Filter /FlateDecode /Length {} >>", dict.trim_end().trim_end_matches(">>"), z.len());
+                out.extend_from_slice(format!("{n} 0 obj\n{d}\nstream\n").as_bytes());
+                out.extend_from_slice(&z);
+                out.extend_from_slice(b"\nendstream\nendobj\n");
+            }
+            None => out.extend_from_slice(format!("{n} 0 obj\n{dict}\nendobj\n").as_bytes()),
+        }
+    }
+    let xref = out.len();
+    let max = objects.iter().map(|o| o.0).max().unwrap_or(0);
+    out.extend_from_slice(format!("xref\n0 {}\n0000000000 65535 f \n", max + 1).as_bytes());
+    for i in 1..=max {
+        match offsets.iter().find(|o| o.0 == i) {
+            Some((_, off)) => out.extend_from_slice(format!("{off:010} 00000 n \n").as_bytes()),
+            None => out.extend_from_slice(b"0000000000 65535 f \n"),
+        }
+    }
+    out.extend_from_slice(format!("trailer\n<< /Size {} /Root {root} 0 R >>\nstartxref\n{xref}\n%%EOF\n", max + 1).as_bytes());
+    out
+}