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M10: Export to Word keeps the page background colour (#2992)

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A page coloured with Edit a PDF > Background exported to Word as a
white page: export pages carried text and images only, and the Word
section has no page colour.

- pdfcraft-edit `page_background`: the colour of the first thing a
  page paints, when that is an opaque fill (no soft mask, Normal blend)
  in a plain gray, RGB or CMYK colour, of a path with a rectangle
  covering the visible page, not clipped smaller; `None` otherwise.
- `export::Page::background` carries it; the Word writer sets it as
  the document background (`w:background`, plus the
  `w:displayBackgroundShape` setting Word needs to show it) when every
  page shares one non-white colour. Word has one background per
  document, so differing colours are left out.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01RUNQSPVXx3dDBabRZHAnjz
This commit is contained in:
mtlcl410
2026-10-20 16:55:20 +08:00
co-authored by Claude Opus 5.5
parent ec0a965074
commit d85d49a4c6
9 changed files with 322 additions and 6 deletions
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parity/acrobat-features.toml
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@@ -6976,8 +6976,8 @@ milestone = "M10"
status = "partial"
commands = ["export.docx"]
tools = ["doc_export_office"]
evidence = ["crates/export/src/lib.rs::word_does_not_invent_borders_for_aligned_invoice_fields", "crates/export/src/lib.rs::word_overlap_does_not_consume_invoice_body_space", "crates/export/src/lib.rs::word_keeps_a_page_with_a_clear_image_and_big_title_in_flow", "crates/export/src/lib.rs::word_rotated_pages_keep_separate_page_sizes_and_unique_shapes", "crates/engine/src/tests.rs::office_export_positions_follow_the_displayed_crop_rotation_and_units", "crates/automation/tests/automation.rs::exporting_an_invoice_to_word_keeps_the_watermark_out_of_flow", "crates/export/src/lib.rs::docx_is_a_word_package", "crates/export/src/lib.rs::text_colour_survives_every_format", "crates/engine/src/tests.rs::exporting_office_files_keeps_text_colour", "crates/export/src/lib.rs::grid_text_becomes_a_real_table_in_every_format", "crates/export/src/lib.rs::a_link_inside_a_sentence_is_not_a_table_column", "crates/export/src/lib.rs::sentences_that_run_on_into_links_are_not_a_table", "crates/export/src/lib.rs::a_superscript_beside_a_number_keeps_its_table", "crates/export/src/lib.rs::word_opens_text_with_control_characters_and_long_pages", "crates/engine/src/tests.rs::exporting_office_files_keeps_images", "crates/automation/tests/automation.rs::exporting_to_word_html_and_rtf", "crates/ui-egui/tests/compare.rs::export_to_word_html_and_rtf"]
notes = "Flowing Word document: paragraphs, Heading 1/2 from larger text, bold/italic, text colour (fill as sRGB; gray/CMYK converted naively, colour spaces via cs/sc read as black), borderless detected tables with spans/empty cells (a row whose blocks run on into each other, such as a link or superscript inside a sentence, or overlap, as a paragraph's lines do, is text and not a table row, #2806), per-page sections/sizes, and positioned editable text/artwork only for pages with rotated text or text overlapped by an image or watermark-sized text, other pages flowing with inline images (#773); synthetic invoice regression; the emitted package validates with Open XML SDK 2.20 (Office 2010 schema). Word/LibreOffice rendering of the positioned output remains unverified. Pictures on positioned pages are DrawingML anchors behind the text (a VML rectangle with an image showed no picture, #1936; not yet opened in Word); a Word file embeds at most 1000 pictures and 512 MiB of them. The earlier flowing output was checked with macOS textutil and opened in Microsoft Word (Windows). Characters XML forbids are dropped; the page size stays within Word's 22 in. Not yet: exact font matching, vector rules, arbitrary paint-order/transparency, colour per run within a paragraph, general exact layout fidelity."
evidence = ["crates/export/src/lib.rs::word_does_not_invent_borders_for_aligned_invoice_fields", "crates/export/src/lib.rs::word_overlap_does_not_consume_invoice_body_space", "crates/export/src/lib.rs::word_keeps_a_page_with_a_clear_image_and_big_title_in_flow", "crates/export/src/lib.rs::word_rotated_pages_keep_separate_page_sizes_and_unique_shapes", "crates/engine/src/tests.rs::office_export_positions_follow_the_displayed_crop_rotation_and_units", "crates/automation/tests/automation.rs::exporting_an_invoice_to_word_keeps_the_watermark_out_of_flow", "crates/export/src/lib.rs::docx_is_a_word_package", "crates/export/src/lib.rs::text_colour_survives_every_format", "crates/engine/src/tests.rs::exporting_office_files_keeps_text_colour", "crates/export/src/lib.rs::grid_text_becomes_a_real_table_in_every_format", "crates/export/src/lib.rs::a_link_inside_a_sentence_is_not_a_table_column", "crates/export/src/lib.rs::sentences_that_run_on_into_links_are_not_a_table", "crates/export/src/lib.rs::a_superscript_beside_a_number_keeps_its_table", "crates/export/src/lib.rs::word_opens_text_with_control_characters_and_long_pages", "crates/engine/src/tests.rs::exporting_office_files_keeps_images", "crates/automation/tests/automation.rs::exporting_to_word_html_and_rtf", "crates/ui-egui/tests/compare.rs::export_to_word_html_and_rtf", "crates/export/src/lib.rs::docx_keeps_a_shared_page_background", "crates/edit/src/tests.rs::a_page_painted_first_with_a_full_page_fill_has_that_background", "crates/engine/src/tests.rs::exporting_to_word_keeps_the_page_background"]
notes = "Flowing Word document: paragraphs, Heading 1/2 from larger text, bold/italic, text colour (fill as sRGB; gray/CMYK converted naively, colour spaces via cs/sc read as black), borderless detected tables with spans/empty cells (a row whose blocks run on into each other, such as a link or superscript inside a sentence, or overlap, as a paragraph's lines do, is text and not a table row, #2806), per-page sections/sizes, the page colour (a full-page opaque fill painted first, such as Edit a PDF ▸ Background) as the document background when every page shares one non-white colour (Word has no per-page background, so differing colours are dropped; #2992), and positioned editable text/artwork only for pages with rotated text or text overlapped by an image or watermark-sized text, other pages flowing with inline images (#773); synthetic invoice regression; the emitted package validates with Open XML SDK 2.20 (Office 2010 schema). Word/LibreOffice rendering of the positioned output remains unverified. Pictures on positioned pages are DrawingML anchors behind the text (a VML rectangle with an image showed no picture, #1936; not yet opened in Word); a Word file embeds at most 1000 pictures and 512 MiB of them. The earlier flowing output was checked with macOS textutil and opened in Microsoft Word (Windows). Characters XML forbids are dropped; the page size stays within Word's 22 in. Not yet: exact font matching, vector rules, arbitrary paint-order/transparency, colour per run within a paragraph, general exact layout fidelity."
[[feature]]
id = "create.export-rtf"