Merge pull request #640 from embedpdf/fix/redaction-layout-shift

bobsingor · web-flow · commit bdd01f151f6d · 2026-05-19T22:28:09.000+03:00
Collapse split page content into single stream
diff --git a/.changeset/pdfium-canonical-page-stream.md b/.changeset/pdfium-canonical-page-stream.md
@@ -0,0 +1,7 @@
+---
+'@embedpdf/pdfium': patch
+---
+
+Fix page layout shifting after editing PDFs whose `/Contents` is a split-stream array (e.g. after redaction).
+
+PDF renders `/Contents` as one continuous program, so graphics state set in one stream carries into the next. The previous behaviour rewrote only the dirty streams while keeping the original split boundaries, which could corrupt the graphics-state handoff between streams and shift the visible layout. `CPDF_PageContentGenerator::GenerateContent` now collapses all active page objects into a single canonical content stream when the page has been edited, via `GenerateCanonicalPageStream` + `CPDF_PageContentManager::ReplaceWithSingleStream`. Form XObjects keep their existing single-stream behaviour.
diff --git a/packages/pdfium/pdfium-src b/packages/pdfium/pdfium-src
@@ -1 +1 @@
-Subproject commit 06053e29aee3b254493f655c89e47f317e678166
+Subproject commit a16cb25f02c0d69cc36c305875005f7c557c76bf
diff --git a/packages/pdfium/src/vendor/pdfium.wasm b/packages/pdfium/src/vendor/pdfium.wasm
