stable-diffusion.cpp: Identity Conditioning in sd-server

Thu, 01 Jan 1970 00:33:46 +0000

Fork of stable-diffusion.cpp adding per-request reference-image identity conditioning (PhotoMaker v2 on SDXL bases, PuLID on Flux) to the sd-server HTTP surface. Upstream registered the flags but only the CLI ever populated them.
Eleven commits, about 1,900 lines added over 19 files. Roughly 89% lives in examples/server/; the core engine changes total 87 lines. sd-cli and the core library stay Python-free.
Reference-image encoding runs in-process through an embedded CPython interpreter (pybind11), behind two CMake flags that default to OFF so the vanilla build is unchanged.
Identity embeddings can be extracted once and re-injected: the round trip reproduces the image-path generation byte for byte at a fixed seed.
“No identity images” is proven to mean “no effect”: generations are md5-identical to the bare base model.
One upstream-worthy bug fix in core: an off-by-one in clip_preprocess center-cropping that crashed any CLIP-vision path on odd input dimensions.

Open-Source on jdcsen