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LibPDF: Allow optional inheritable page attributes

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Previously, get_inheritable_object would always try to find the object
and throw an error if it couldn't. The spec tells us that some page
attributes, like CropBox, are optional but also inheritable. Others,
like the media box and resources, are technically required by the spec,
but omitted by some documents.

In both cases, we are now able to search for inheritable objects and
find a suitable replacement if there wasn't one.
This commit is contained in:
Julian Offenhäuser 2023-03-24 22:07:03 +01:00 • committed by Andrew Kaster
parent 320f5f91ab
commit fde990ead8
2 changed files with 37 additions and 15 deletions
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2
Userland/Libraries/LibPDF/Document.h
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@ -143,7 +143,7 @@ private:
PDFErrorOr<Destination> create_destination_from_parameters(NonnullRefPtr<ArrayObject>, HashMap<u32, u32> const&);
PDFErrorOr<Destination> create_destination_from_dictionary_entry(NonnullRefPtr<Object> const& entry, HashMap<u32, u32> const& page_number_by_index_ref);
PDFErrorOr<NonnullRefPtr<Object>> get_inheritable_object(DeprecatedFlyString const& name, NonnullRefPtr<DictObject>);
PDFErrorOr<Optional<NonnullRefPtr<Object>>> get_inheritable_object(DeprecatedFlyString const& name, NonnullRefPtr<DictObject>);
PDFErrorOr<NonnullRefPtr<Object>> find_in_name_tree(NonnullRefPtr<DictObject> root, DeprecatedFlyString name);
PDFErrorOr<NonnullRefPtr<Object>> find_in_name_tree_nodes(NonnullRefPtr<ArrayObject> siblings, DeprecatedFlyString name);