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Exported images keep their transparency, JPEG cut-outs included (#645) (#763)

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* M10: exported images keep their transparency, JPEG cut-outs included (#645)

Export all images and Save image as wrote a JPEG with a soft mask as the
bare JPEG and dropped soft masks of another size, JPEG-compressed soft
masks, stencil /Mask images and colour-key /Mask arrays, so cut-out
images came out on a solid white or black background.

- An image with transparency (/SMask, stencil /Mask, colour-key /Mask) is
  written as a PNG with it as alpha, JPEG images included (decoded with
  the image crate's JPEG decoder, already in the tree). JPEGs without
  transparency are still written byte for byte.
- Soft and stencil masks of another size are scaled to the image's size;
  /Decode inversion is honoured and /Matte pre-blending is undone.
- Image sizes are checked (positive, at most 100 Mpx) before use, so a
  negative /Width no longer overflows in Save image as.
- Regression tests: JPEG + soft mask, scaled soft mask, stencil mask,
  colour key, matte, and damaged masks/sizes (all fail or panic on main).

Fixes #645

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

* M10: use as_chunks for colour-key pairs (clippy 1.99 chunks_exact_to_as_chunks) (#645)

Rust 1.99's clippy denies chunks_exact with a constant size, which failed
the Clippy step on all CI targets. as_chunks::<2> also drops the indexing.

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

---------

Co-authored-by: DWAA1660 <DWAA1660@users.noreply.github.com>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
Co-authored-by: Brandon Thomas <echelon@gmail.com>
This commit is contained in:
DWAA1660
2026-10-10 16:31:41 -04:00
committed by GitHub
co-authored by Claude Opus 5.5 DWAA1660 Brandon Thomas
parent 8309c84a59
commit 3906dcdff5
5 changed files with 344 additions and 34 deletions
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parity/acrobat-features.toml
+2 -2
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@@ -6970,8 +6970,8 @@ milestone = "M10"
status = "shipped"
commands = ["export.all_images"]
tools = ["doc_export_all_images"]
evidence = ["crates/create/src/tests.rs::images_export_as_jpeg_unchanged_and_others_as_png", "crates/create/src/tests.rs::indexed_and_one_bit_images_decode", "crates/automation/tests/automation.rs::exporting_all_images_through_tools", "crates/ui-egui/tests/export.rs::export_dialogs_write_images_and_text"]
notes = "each image once (page resources and nested forms); JPEG unchanged, others PNG (gray/RGB/CMYK/ICC/Indexed, 1–16 bpc, stencil masks, soft mask as alpha); JPX/JBIG2/CCITT/separations reported as skipped; minimum size filter"
evidence = ["crates/create/src/tests.rs::images_export_as_jpeg_unchanged_and_others_as_png", "crates/create/src/tests.rs::indexed_and_one_bit_images_decode", "crates/create/src/tests.rs::jpeg_images_with_a_soft_mask_export_as_png_with_alpha", "crates/create/src/tests.rs::soft_masks_of_another_size_and_stencil_and_colour_key_masks_become_alpha", "crates/automation/tests/automation.rs::exporting_all_images_through_tools", "crates/ui-egui/tests/export.rs::export_dialogs_write_images_and_text"]
notes = "each image once (page resources and nested forms); JPEG unchanged unless it has transparency, others PNG (gray/RGB/CMYK/ICC/Indexed, 1–16 bpc, stencil masks); transparency as PNG alpha: /SMask (scaled to the image size, /Matte un-blended), stencil /Mask and colour-key /Mask, JPEG images included (#645); JPX/JBIG2/CCITT masks are left out (image exported opaque); JPX/JBIG2/CCITT/separations reported as skipped; minimum size filter"
[[feature]]
id = "create.export-html"