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M11: Reduce file size and Optimize PDF drop images nothing draws, such as a deleted image (#894)

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Deleting an image with Edit a PDF removes its Do operation, but the image stays in the
page's /Resources /XObject, so every full rewrite (Reduce file size, Optimize PDF)
carried its data along: a page left blank still weighed the whole picture.

Clean Up now drops image and form XObjects from a page's own resources when their name
is written in no stream the document still uses. Shared and inherited resources are left
alone, and if any stream can't be read the way a viewer would read it, nothing is removed:
viewers look names up through parent resources, so only a name written nowhere is safe to
drop. doc_optimize reports unused_xobjects.

Co-authored-by: Andrew Taylor <andrew.taylor@tayeng.com>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
taylorandrew07-lab
2026-10-10 16:21:07 -04:00
committed by GitHub
co-authored by Andrew Taylor Claude Opus 5.5
parent 4fd2c2b3a3
commit 4dafbfc325
7 changed files with 590 additions and 6 deletions
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parity/acrobat-features.toml
+2 -2
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@@ -7154,8 +7154,8 @@ milestone = "M11"
status = "partial"
commands = ["optimize.advanced"]
tools = ["doc_optimize"]
evidence = ["crates/ui-egui/tests/create.rs::the_pdf_optimizer_dialog_saves_an_optimized_copy", "crates/automation/tests/automation.rs::optimizing_through_tools", "crates/ui-egui/src/optimize_ui.rs::the_progress_card_shows_the_stage_and_cancels", "crates/engine/src/tests.rs::an_optimize_job_reports_its_stages_and_can_be_cancelled"]
notes = "Images, Discard Objects, Discard User Data, Clean Up; runs in the background with a progress bar (per image) and Cancel; no Fonts or Transparency panels, no space audit"
evidence = ["crates/ui-egui/tests/create.rs::the_pdf_optimizer_dialog_saves_an_optimized_copy", "crates/automation/tests/automation.rs::optimizing_through_tools", "crates/ui-egui/src/optimize_ui.rs::the_progress_card_shows_the_stage_and_cancels", "crates/engine/src/tests.rs::an_optimize_job_reports_its_stages_and_can_be_cancelled", "crates/optimize/tests/optimize.rs::images_and_forms_nothing_draws_are_dropped", "crates/automation/tests/automation.rs::a_deleted_image_is_not_kept_by_reduce_or_optimize"]
notes = "Images, Discard Objects, Discard User Data, Clean Up (also drops images and forms the pages list but never draw, such as deleted images); runs in the background with a progress bar (per image) and Cancel; no Fonts or Transparency panels, no space audit"
[[feature]]
id = "optimize.downsample-images"