C reference implementation of the ASC Framing Decision List (FDL) specification.

Overview

The FDL Core Library provides a pure-C ABI for parsing, creating, validating, and serializing Framing Decision Lists. It includes geometry math utilities and a template application engine for computing output framing from intents.

Key API Areas

Document lifecycle — fdl_doc_create(), fdl_doc_parse_json(), fdl_doc_to_json(), fdl_doc_free()
Tree traversal — navigate contexts, canvases, framing decisions, and framing intents
Geometry math — dimension normalization, scaling, rounding, and alignment
Template application — fdl_apply_canvas_template() computes output framing from a canvas template and source canvas
Canvas resolution — fdl_context_resolve_canvas_for_dimensions() finds or creates a matching canvas
Validation — fdl_doc_validate() checks structural and semantic correctness
Builder API — programmatic construction of FDL documents

All public symbols are declared in fdl_core.h and prefixed with fdl_.