stechio

[#712] Optional Content (aka PDF Layers) implementation

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This is an implementation of the missing Optional Content / PDF Layers functionality (#712). In order to introduce the support to layers, I tried to leverage the existing code base...

Absolute positioning fails in some common cases

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I noticed that absolute positioning has a few annoying defects in the way it deals with vertical lengths: 1) **anchoring to page bottom**: anchoring an element to page bottom makes...

[version: 1.0.9-SNAPSHOT; commit: [ccd29f03ede2aecadac9c39fda95a5fedfb23645](https://github.com/danfickle/openhtmltopdf/tree/ccd29f03ede2aecadac9c39fda95a5fedfb23645)] I noticed that `font` CSS shorthand property doesn't work, while the corresponding `font-*` CSS properties do: [CssFont.pdf](https://github.com/danfickle/openhtmltopdf/files/6237287/CssFont.pdf) [CssFont.html.txt](https://github.com/danfickle/openhtmltopdf/files/6237286/CssFont.html.txt) Here are the declarations used: ```html /* This...

Optional content groups (OCG)

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Looking for the support of optional content groups (OCGs, also known as PDF layers), I couldn't find any reference to `org.apache.pdfbox.pdmodel.graphics.optionalcontent.PDOptionalContentGroup` in OHTP: can someone confirm OCGs (and, more generically,...

Enhancements

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This branch provides several enhancements to existing interfaces and data handling (_as a consequence, compatibility with previous versions is BROKEN_): - explicit element path tracking (ElementPath class): object keys and...

14.7.5 (Logical structure, PDF objects as content items): parent structure elements and object references

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Here I am reporting a possible bug to correct (SUB-ISSUE 1), and requesting a clarification on an apparent contradiction related to it (SUB-ISSUE 2). ### SUB-ISSUE 1: Cardinality of parent...

7.11 (File specifications): Subclause organization improvement

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IMHO, subclause 7.11 (File specifications) is not well-organized: subclause 7.11.2.2 (Absolute and relative file specifications) describes file specifications belonging to *any file system* (both platform-independent file names and URLs), yet...

8.4.5 (Graphics state parameter dictionaries, aka ExtGState): extend to full superset of parameters associated to individual operators

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Within the graphics state model, the dictionary associated to the `gs` operator (ExtGState) supports only a subset (`Font` entry corresponding to `Tf` operator) of the **text state parameters** associated to...

### SUB-ISSUE 1: File identifiers definition Subclause 14.4 (File identifiers) states: > The value of this entry shall be an array of two byte strings. The first byte string shall...

Usage clarification about nullness semantics in case of abnormal occurrences

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I'm facing a semantic problem about the way invalid structures relate to nullness. Let's say the specification of a data structure requires one of its properties to be non-null, so...