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M3: document why fixed-zoom sizes differ from Acrobat (no runtime change) (#736) 

* Parity: document the Page Display resolution gap at fixed zoom

view.zoom-to-percent and view.zoom-actual-size are shipped with empty
notes. Record that PdfCraft's 100% is its fixed 96-dpi basis, that
Acrobat's fixed-percentage display also depends on its Page Display
Resolution preference, and that PdfCraft does not offer that preference
yet (tracked with misc.prefs-page-display). Status, commands, tools and
evidence are unchanged. No runtime behavior changed.

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

* Parity: state the Acrobat fixed-zoom formula in the zoom notes

The zoom percentage and Actual Size notes now give the measured rule
(logical px per PDF point = ppi / 72 × zoom), name the Custom
resolutions checked black-box, and say that Use System Setting is not
reproduced. Status, commands, tools and evidence are unchanged. No
runtime behavior changed.

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

---------

Co-authored-by: Claude Haiku 5.5 <noreply@anthropic.com>
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cyfung1031 2026-10-10 19:01:50 +09:00 committed by GitHub
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parity/acrobat-features.toml
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@ -927,7 +927,7 @@ status = "shipped"
commands = []
tools = []
evidence = ["crates/ui-egui/tests/ui.rs::selection_works_in_every_view_rotation"]
notes = ""
notes = "PdfCraft draws a percentage on its fixed 96-dpi basis: 96/72 logical pixels per PDF point at 100%. Acrobat draws it at its Page Display resolution, with logical pixels per PDF point = ppi / 72 × zoom (checked black-box with Custom resolutions of 96, 110 and 120 ppi on one display), so the same percentage can differ in size. Acrobat's Use System Setting resolution is not reproduced. Tracked with misc.prefs-page-display"
[[feature]]
id = "view.zoom-actual-size"
@ -939,7 +939,7 @@ status = "shipped"
commands = []
tools = []
evidence = ["crates/ui-egui/tests/view.rs::actual_size_fit_width_and_fit_page"]
notes = ""
notes = "Actual size is 100% on PdfCraft's fixed 96-dpi basis: 96/72 logical pixels per PDF point. Acrobat's Actual Size uses its Page Display resolution (ppi / 72 logical pixels per PDF point at 100%), which PdfCraft does not offer yet, so the two can draw a page at different sizes. Tracked with misc.prefs-page-display"
[[feature]]
id = "view.zoom-fit-page"