adds color profiles/output intents and an xmp metadata stream to the document in order to be compliant with pdf/a-1b (basic). this compliance level is toggled on the builder since it will generate larger files and set to 'off/none' by default. pdf/a documents are also not able to use standard fonts so using a font when the compliance level is not none will throw.
the cross reference parser tests behaviour had change, this fixes a compilation error from merge conflicts. also updates the merger tests to account for new version behaviour and checks the output document text. adds pdfmerger to the public api in the tests.
since the properties in marked content may be indirect references or belong to the page resources array, the value should be calculated during content processing. this change tidies up the marked content classes so they do not expose mutable data and uses the pdf token scanner overloads to load dictionary data.
highlight, link, strikeout, squiggly and underline annotation types may define a set of quadrilaterals using the quadpoints entry. this defines the regions to show/activate the annotation. the order of points in the quadpoints array does not match the specification so we provide a convenience class to access the point data rather than interpreting it as a rectangle: https://stackoverflow.com/questions/9855814/pdf-spec-vs-acrobat-creation-quadpoints.
support both xobject and inline images. adds unsupported filters so that exceptions are only thrown when accessing lazily evaluated image.bytes property rather than when opening the page.
treat all warnings as errors.
- Create a TextBlock class
- Creates IPageSegmenter
- Add other useful distances: angle, etc.
- Update RecursiveXYCut
- With IPageSegmenter and TextBlock
- Make XYNode and XYLeaf internal
- Optimise (faster) NearestNeighbourWordExtractor and isolate the clustering algorithms for use outside of this class
- Implement a Docstrum inspired page segmentation algorithm
Text edges are where words have either there BoundingBox's left, right or mid coordinate aligned on the same vertical line.
Useful to detect tables, justified text, lists, etc.
