Generating Vector PDFs with Cairo’s PDF Surface Backend
Learn how to create vector PDFs with Cairo’s PDF surface backend, see a minimal C example, and understand font, transparency, and version trade‑offs.
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Learn how to create vector PDFs with Cairo’s PDF surface backend, see a minimal C example, and understand font, transparency, and version trade‑offs.
Goal Pass a reference to a Crystal object into a C library callback so the C side can retain and later invoke it, while the Crystal process uses the default Boehm conservative garbage collector. Constraint The Boehm GC does not automatically treat pointers stored in C memory as roots, and Crystal's FFI documentation does not clearly specify a supported API f