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Nibble Stew: Functionality currently implemented in CapyPDF
source link: https://nibblestew.blogspot.com/2023/06/functionality-currently-implemented-in.html
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CapyPDF has a fair bit of functionality and it might be difficult to tell from the outside what works and what does not. Here is a rough outline of implemented functionality.
In the public C API (and Python)
- Basic draw commands in RGB, gray and CMYK
- ICC profile support
- Loading PNG, JPG and TIFF images (including CMYK TIFFs)
- Embed JPG files directly without unpacking first
- Using images as a paint mask
- Handle color profiles embedded in images
- Using builtin PDF fonts
- Using TrueType fonts with font subsetting
- All PDF font operators like extra padding, raise/lower and set as clipping path
- Page transitions
Implemented but not exposed
The items listed here vary in implementation completeness from "sort of ready, just not exposed yet" to "the Mmest of MVP". You can only get to them by poking at the innards directly.
- Document navigation tree
- Overprinting
- Structured and annotated PDF
- Additional color channels (called separations in the PDF spec)
- Form XObjects
- File embedding
- Annotations (only a few types)
- L*a*b* color space support
- ICC colors in primitive paint operations
- Type 2, 3 and 4 shadings (i.e. gradients)
- Color patterns
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