[api-minor] Implement basic support for OptionalContent Usage dicts (issue 5764, bug 1826783)
#17726
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… (issue 5764, bug 1826783) The following are some highlights of this patch: - In the Worker we only extract a *subset* of the potential contents of the `Usage` dictionary, to avoid having to implement/test a bunch of code that'd be completely unused in the viewer. - In order to still allow the user to *manually* override the default visible layers in the viewer, the viewable/printable state is purposely *not* enforced during initialization in the `OptionalContentConfig` constructor. - Printing will now always use the *default* visible layers, rather than using the same state as the viewer (as was the case previously). This ensures that the printing-output will correctly take the `Usage` dictionary into account, and in practice toggling of visible layers rarely seem to be necessary except in the viewer itself (if at all).[1] --- [1] In the unlikely case that it'd ever be deemed necessary to support fine-grained control of optional content visibility during printing, some new (additional) UI would likely be needed to support that case.
… (PR 15377 follow-up) This helps ensure that /SetOCGState actions always take the `Usage` dictionary into account as expected.
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/botio test |
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The following are some highlights of this patch:
In the Worker we only extract a subset of the potential contents of the
Usagedictionary, to avoid having to implement/test a bunch of code that'd be completely unused in the viewer.In order to still allow the user to manually override the default visible layers in the viewer, the viewable/printable state is purposely not enforced during initialization in the
OptionalContentConfigconstructor.Printing will now always use the default visible layers, rather than using the same state as the viewer (as was the case previously).
This ensures that the printing-output will correctly take the
Usagedictionary into account, and in practice toggling of visible layers rarely seem to be necessary except in the viewer itself (if at all).[1][1] In the unlikely case that it'd ever be deemed necessary to support fine-grained control of optional content visibility during printing, some new (additional) UI would likely be needed to support that case.